2c5e7c6143
https://source.android.com/docs/security/bulletin/2023-07-01 CVE-2022-42703 CVE-2023-21255 CVE-2023-25012 * tag 'ASB-2023-07-05_4.19-stable' of https://android.googlesource.com/kernel/common: Linux 4.19.288 i2c: imx-lpi2c: fix type char overflow issue when calculating the clock cycle x86/apic: Fix kernel panic when booting with intremap=off and x2apic_phys drm/radeon: fix race condition UAF in radeon_gem_set_domain_ioctl drm/exynos: fix race condition UAF in exynos_g2d_exec_ioctl drm/exynos: vidi: fix a wrong error return ASoC: nau8824: Add quirk to active-high jack-detect s390/cio: unregister device when the only path is gone usb: gadget: udc: fix NULL dereference in remove() nfcsim.c: Fix error checking for debugfs_create_dir media: cec: core: don't set last_initiator if tx in progress arm64: Add missing Set/Way CMO encodings HID: wacom: Add error check to wacom_parse_and_register() scsi: target: iscsi: Prevent login threads from racing between each other sch_netem: acquire qdisc lock in netem_change() netfilter: nfnetlink_osf: fix module autoload netfilter: nf_tables: disallow element updates of bound anonymous sets be2net: Extend xmit workaround to BE3 chip mmc: usdhi60rol0: fix deferred probing mmc: sdhci-acpi: fix deferred probing mmc: omap_hsmmc: fix deferred probing mmc: omap: fix deferred probing mmc: mvsdio: fix deferred probing mmc: mvsdio: convert to devm_platform_ioremap_resource mmc: mtk-sd: fix deferred probing net: qca_spi: Avoid high load if QCA7000 is not available xfrm: Linearize the skb after offloading if needed. ieee802154: hwsim: Fix possible memory leaks rcu: Upgrade rcu_swap_protected() to rcu_replace_pointer() nilfs2: prevent general protection fault in nilfs_clear_dirty_page() cgroup: Do not corrupt task iteration when rebinding subsystem PCI: hv: Fix a race condition bug in hv_pci_query_relations() Drivers: hv: vmbus: Fix vmbus_wait_for_unload() to scan present CPUs nilfs2: fix buffer corruption due to concurrent device reads ipmi: move message error checking to avoid deadlock ipmi: Make the smi watcher be disabled immediately when not needed x86/purgatory: remove PGO flags nilfs2: reject devices with insufficient block count serial: lantiq: add missing interrupt ack serial: lantiq: Do not swap register read/writes serial: lantiq: Use readl/writel instead of ltq_r32/ltq_w32 serial: lantiq: Change ltq_w32_mask to asc_update_bits Linux 4.19.287 mmc: block: ensure error propagation for non-blk powerpc: Fix defconfig choice logic when cross compiling drm/nouveau/kms: Fix NULL pointer dereference in nouveau_connector_detect_depth neighbour: delete neigh_lookup_nodev as not used net: Remove unused inline function dst_hold_and_use() neighbour: Remove unused inline function neigh_key_eq16() selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET net: tipc: resize nlattr array to correct size net: lapbether: only support ethernet devices drm/nouveau: add nv_encoder pointer check for NULL drm/nouveau/kms: Don't change EDID when it hasn't actually changed drm/nouveau/dp: check for NULL nv_connector->native_mode igb: fix nvm.ops.read() error handling sctp: fix an error code in sctp_sf_eat_auth() IB/isert: Fix incorrect release of isert connection IB/isert: Fix possible list corruption in CMA handler IB/isert: Fix dead lock in ib_isert IB/uverbs: Fix to consider event queue closing also upon non-blocking mode RDMA/rxe: Fix the use-before-initialization error of resp_pkts RDMA/rxe: Removed unused name from rxe_task struct RDMA/rxe: Remove the unused variable obj ping6: Fix send to link-local addresses with VRF. netfilter: nfnetlink: skip error delivery on batch in case of ENOMEM usb: gadget: f_ncm: Fix NTP-32 support usb: gadget: f_ncm: Add OS descriptor support usb: dwc3: gadget: Reset num TRBs before giving back the request USB: serial: option: add Quectel EM061KGL series Remove DECnet support from kernel net: usb: qmi_wwan: add support for Compal RXM-G1 RDMA/uverbs: Restrict usage of privileged QKEYs nouveau: fix client work fence deletion race powerpc/purgatory: remove PGO flags kexec: support purgatories with .text.hot sections nilfs2: fix possible out-of-bounds segment allocation in resize ioctl nilfs2: fix incomplete buffer cleanup in nilfs_btnode_abort_change_key() nios2: dts: Fix tse_mac "max-frame-size" property ocfs2: check new file size on fallocate call ocfs2: fix use-after-free when unmounting read-only filesystem xen/blkfront: Only check REQ_FUA for writes mips: Move initrd_start check after initrd address sanitisation. MIPS: Alchemy: fix dbdma2 parisc: Improve cache flushing for PCXL in arch_sync_dma_for_cpu() power: supply: Fix logic checking if system is running from battery irqchip/meson-gpio: Mark OF related data as maybe unused regulator: Fix error checking for debugfs_create_dir power: supply: Ratelimit no data debug output ARM: dts: vexpress: add missing cache properties power: supply: bq27xxx: Use mod_delayed_work() instead of cancel() + schedule() power: supply: ab8500: Fix external_power_changed race Revert "tcp: deny tcp_disconnect() when threads are waiting" Revert "tcp: deny tcp_disconnect() when threads are waiting" ANDROID: GKI: update ABI xml for incrementalfs.ko Linux 4.19.286 Revert "staging: rtl8192e: Replace macro RTL_PCI_DEVICE with PCI_DEVICE" btrfs: unset reloc control if transaction commit fails in prepare_to_relocate() btrfs: check return value of btrfs_commit_transaction in relocation ext4: only check dquot_initialize_needed() when debugging i2c: sprd: Delete i2c adapter in .remove's error path pinctrl: meson-axg: add missing GPIOA_18 gpio group Bluetooth: Fix use-after-free in hci_remove_ltk/hci_remove_irk ceph: fix use-after-free bug for inodes when flushing capsnaps drm/amdgpu: fix xclk freq on CHIP_STONEY Input: psmouse - fix OOB access in Elantech protocol Input: xpad - delete a Razer DeathAdder mouse VID/PID entry batman-adv: Broken sync while rescheduling delayed work lib: cpu_rmap: Fix potential use-after-free in irq_cpu_rmap_release() net: sched: fix possible refcount leak in tc_chain_tmplt_add() net: sched: move rtm_tca_policy declaration to include file rfs: annotate lockless accesses to RFS sock flow table rfs: annotate lockless accesses to sk->sk_rxhash Bluetooth: L2CAP: Add missing checks for invalid DCID Bluetooth: Fix l2cap_disconnect_req deadlock net: dsa: lan9303: allow vid != 0 in port_fdb_{add|del} methods spi: qup: Request DMA before enabling clocks i40e: fix build warnings in i40e_alloc.h i40iw: fix build warning in i40iw_manage_apbvt() UPSTREAM: net: cdc_ncm: Deal with too low values of dwNtbOutMaxSize UPSTREAM: cdc_ncm: Fix the build warning UPSTREAM: cdc_ncm: Implement the 32-bit version of NCM Transfer Block Revert "tcp: reduce POLLOUT events caused by TCP_NOTSENT_LOWAT" Revert "tcp: return EPOLLOUT from tcp_poll only when notsent_bytes is half the limit" Revert "tcp: factor out __tcp_close() helper" Revert "tcp: add annotations around sk->sk_shutdown accesses" ANDROID: fix abi break in 4.19.284 for cpuhotplug.h UPSTREAM: mailbox: mailbox-test: fix a locking issue in mbox_test_message_write() UPSTREAM: mailbox: mailbox-test: Fix potential double-free in mbox_test_message_write() Linux 4.19.285 wifi: rtlwifi: 8192de: correct checking of IQK reload scsi: dpt_i2o: Do not process completions with invalid addresses scsi: dpt_i2o: Remove broken pass-through ioctl (I2OUSERCMD) regmap: Account for register length when chunking fbcon: Fix null-ptr-deref in soft_cursor ext4: add lockdep annotations for i_data_sem for ea_inode's selinux: don't use make's grouped targets feature yet tty: serial: fsl_lpuart: use UARTCTRL_TXINV to send break instead of UARTCTRL_SBK mmc: vub300: fix invalid response handling rsi: Remove unnecessary boolean condition regulator: da905{2,5}: Remove unnecessary array check hwmon: (scmi) Remove redundant pointer check wifi: rtlwifi: remove always-true condition pointed out by GCC 12 lib/dynamic_debug.c: use address-of operator on section symbols kernel/extable.c: use address-of operator on section symbols eth: sun: cassini: remove dead code gcc-12: disable '-Wdangling-pointer' warning for now ACPI: thermal: drop an always true check x86/boot: Wrap literal addresses in absolute_pointer() ata: libata-scsi: Use correct device no in ata_find_dev() scsi: stex: Fix gcc 13 warnings usb: gadget: f_fs: Add unbind event before functionfs_unbind net: usb: qmi_wwan: Set DTR quirk for BroadMobi BM818 iio: dac: build ad5758 driver when AD5758 is selected iio: dac: mcp4725: Fix i2c_master_send() return value handling HID: wacom: avoid integer overflow in wacom_intuos_inout() HID: google: add jewel USB id iio: adc: mxs-lradc: fix the order of two cleanup operations mailbox: mailbox-test: fix a locking issue in mbox_test_message_write() atm: hide unused procfs functions ALSA: oss: avoid missing-prototype warnings netfilter: conntrack: define variables exp_nat_nla_policy and any_addr with CONFIG_NF_NAT wifi: b43: fix incorrect __packed annotation scsi: core: Decrease scsi_device's iorequest_cnt if dispatch failed arm64/mm: mark private VM_FAULT_X defines as vm_fault_t ARM: dts: stm32: add pin map for CAN controller on stm32f7 wifi: rtl8xxxu: fix authentication timeout due to incorrect RCR value media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221 media: dvb-core: Fix kernel WARNING for blocking operation in wait_event*() media: dvb-core: Fix use-after-free due on race condition at dvb_net media: mn88443x: fix !CONFIG_OF error by drop of_match_ptr from ID table media: ttusb-dec: fix memory leak in ttusb_dec_exit_dvb() media: dvb_ca_en50221: fix a size write bug media: netup_unidvb: fix irq init by register it at the end of probe media: dvb-usb: dw2102: fix uninit-value in su3000_read_mac_address media: dvb-usb: digitv: fix null-ptr-deref in digitv_i2c_xfer() media: dvb-usb-v2: rtl28xxu: fix null-ptr-deref in rtl28xxu_i2c_xfer media: dvb-usb-v2: ce6230: fix null-ptr-deref in ce6230_i2c_master_xfer() media: dvb-usb-v2: ec168: fix null-ptr-deref in ec168_i2c_xfer() media: dvb-usb: az6027: fix three null-ptr-deref in az6027_i2c_xfer() media: dvb_demux: fix a bug for the continuity counter ASoC: ssm2602: Add workaround for playback distortions xfrm: Check if_id in inbound policy/secpath match ASoC: dwc: limit the number of overrun messages nbd: Fix debugfs_create_dir error checking fbdev: stifb: Fix info entry in sti_struct on error path fbdev: modedb: Add 1920x1080 at 60 Hz video mode media: rcar-vin: Select correct interrupt mode for V4L2_FIELD_ALTERNATE ARM: 9295/1: unwind:fix unwind abort for uleb128 case mailbox: mailbox-test: Fix potential double-free in mbox_test_message_write() watchdog: menz069_wdt: fix watchdog initialisation net: dsa: mv88e6xxx: Increase wait after reset deactivation net/sched: flower: fix possible OOB write in fl_set_geneve_opt() udp6: Fix race condition in udp6_sendmsg & connect net/netlink: fix NETLINK_LIST_MEMBERSHIPS length report ocfs2/dlm: move BITS_TO_BYTES() to bitops.h for wider use net: sched: fix NULL pointer dereference in mq_attach net/sched: Prohibit regrafting ingress or clsact Qdiscs net/sched: Reserve TC_H_INGRESS (TC_H_CLSACT) for ingress (clsact) Qdiscs net/sched: sch_clsact: Only create under TC_H_CLSACT net/sched: sch_ingress: Only create under TC_H_INGRESS tcp: Return user_mss for TCP_MAXSEG in CLOSE/LISTEN state if user_mss set tcp: deny tcp_disconnect() when threads are waiting af_packet: do not use READ_ONCE() in packet_bind() amd-xgbe: fix the false linkup in xgbe_phy_status af_packet: Fix data-races of pkt_sk(sk)->num. netrom: fix info-leak in nr_write_internal() net/mlx5: fw_tracer, Fix event handling dmaengine: pl330: rename _start to prevent build error netfilter: ctnetlink: Support offloaded conntrack entry deletion ipv{4,6}/raw: fix output xfrm lookup wrt protocol bluetooth: Add cmd validity checks at the start of hci_sock_ioctl() cdc_ncm: Fix the build warning power: supply: bq24190: Call power_supply_changed() after updating input current power: supply: core: Refactor power_supply_set_input_current_limit_from_supplier() power: supply: bq27xxx: After charger plug in/out wait 0.5s for things to stabilize net: cdc_ncm: Deal with too low values of dwNtbOutMaxSize cdc_ncm: Implement the 32-bit version of NCM Transfer Block UPSTREAM: efi: rt-wrapper: Add missing include BACKPORT: arm64: efi: Execute runtime services from a dedicated stack Revert "uapi/linux/const.h: prefer ISO-friendly __typeof__" Linux 4.19.284 drivers: depend on HAS_IOMEM for devm_platform_ioremap_resource() 3c589_cs: Fix an error handling path in tc589_probe() forcedeth: Fix an error handling path in nv_probe() ASoC: Intel: Skylake: Fix declaration of enum skl_ch_cfg x86/show_trace_log_lvl: Ensure stack pointer is aligned, again xen/pvcalls-back: fix double frees with pvcalls_new_active_socket() coresight: Fix signedness bug in tmc_etr_buf_insert_barrier_packet() power: supply: sbs-charger: Fix INHIBITED bit for Status reg power: supply: bq27xxx: Fix poll_interval handling and races on remove power: supply: bq27xxx: Fix I2C IRQ race on remove power: supply: bq27xxx: Fix bq27xxx_battery_update() race condition power: supply: leds: Fix blink to LED on transition ipv6: Fix out-of-bounds access in ipv6_find_tlv() bpf: Fix mask generation for 32-bit narrow loads of 64-bit fields net: fix skb leak in __skb_tstamp_tx() media: radio-shark: Add endpoint checks USB: sisusbvga: Add endpoint checks USB: core: Add routines for endpoint checks in old drivers udplite: Fix NULL pointer dereference in __sk_mem_raise_allocated(). ALSA: hda/realtek - Fix inverted bass GPIO pin on Acer 8951G ALSA: hda/realtek - Fixed one of HP ALC671 platform Headset Mic supported parisc: Fix flush_dcache_page() for usage from irq context selftests/memfd: Fix unknown type name build failure x86/mm: Avoid incomplete Global INVLPG flushes btrfs: use nofs when cleaning up aborted transactions parisc: Allow to reboot machine after system halt m68k: Move signal frame following exception on 68020/030 ALSA: hda/ca0132: add quirk for EVGA X299 DARK spi: fsl-cpm: Use 16 bit mode for large transfers with even size spi: fsl-spi: Re-organise transfer bits_per_word adaptation spi: spi-fsl-spi: automatically adapt bits-per-word in cpu mode s390/qdio: fix do_sqbs() inline assembly constraint s390/qdio: get rid of register asm vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF vc_screen: rewrite vcs_size to accept vc, not inode usb: gadget: u_ether: Fix host MAC address case usb: gadget: u_ether: Convert prints to device prints lib/string_helpers: Introduce string_upper() and string_lower() helpers ALSA: hda/realtek: Add a quirk for HP EliteDesk 805 ALSA: hda/realtek - ALC897 headset MIC no sound ALSA: hda/realtek - Add headset Mic support for Lenovo ALC897 platform ALSA: hda/realtek: Fix the mic type detection issue for ASUS G551JW ALSA: hda/realtek - The front Mic on a HP machine doesn't work ALSA: hda/realtek - Enable the headset of Acer N50-600 with ALC662 ALSA: hda/realtek - Enable headset mic of Acer X2660G with ALC662 ALSA: hda/realtek - Add Headset Mic supported for HP cPC ALSA: hda/realtek - More constifications Add Acer Aspire Ethos 8951G model quirk HID: wacom: Force pen out of prox if no events have been received in a while netfilter: nf_tables: do not allow RULE_ID to refer to another chain netfilter: nf_tables: validate NFTA_SET_ELEM_OBJREF based on NFT_SET_OBJECT flag netfilter: nf_tables: stricter validation of element data netfilter: nf_tables: allow up to 64 bytes in the set element data area netfilter: nf_tables: add nft_setelem_parse_key() netfilter: nf_tables: validate registers coming from userspace. netfilter: nftables: statify nft_parse_register() netfilter: nftables: add nft_parse_register_store() and use it netfilter: nftables: add nft_parse_register_load() and use it nilfs2: fix use-after-free bug of nilfs_root in nilfs_evict_inode() tpm/tpm_tis: Disable interrupts for more Lenovo devices ceph: force updating the msg pointer in non-split case serial: Add support for Advantech PCI-1611U card statfs: enforce statfs[64] structure initialization ALSA: hda: Add NVIDIA codec IDs a3 through a7 to patch table ALSA: hda: Fix Oops by 9.1 surround channel names usb: typec: altmodes/displayport: fix pin_assignment_show usb-storage: fix deadlock when a scsi command timeouts more than once vlan: fix a potential uninit-value in vlan_dev_hard_start_xmit() igb: fix bit_shift to be in [1..8] range cassini: Fix a memory leak in the error handling path of cas_init_one() net: bcmgenet: Restore phy_stop() depending upon suspend/close net: bcmgenet: Remove phy_stop() from bcmgenet_netif_stop() net: nsh: Use correct mac_offset to unwind gso skb in nsh_gso_segment() drm/exynos: fix g2d_open/close helper function definitions media: netup_unidvb: fix use-after-free at del_timer() erspan: get the proto with the md version for collect_md ip_gre, ip6_gre: Fix race condition on o_seqno in collect_md mode ip6_gre: Make o_seqno start from 0 in native mode ip6_gre: Fix skb_under_panic in __gre6_xmit() serial: arc_uart: fix of_iomap leak in `arc_serial_probe` drivers: provide devm_platform_ioremap_resource() vsock: avoid to close connected socket after the timeout net: fec: Better handle pm_runtime_get() failing in .remove() af_key: Reject optional tunnel/BEET mode templates in outbound policies cpupower: Make TSC read per CPU for Mperf monitor btrfs: fix space cache inconsistency after error loading it from disk btrfs: replace calls to btrfs_find_free_ino with btrfs_find_free_objectid mfd: dln2: Fix memory leak in dln2_probe() phy: st: miphy28lp: use _poll_timeout functions for waits Input: xpad - add constants for GIP interface numbers clk: tegra20: fix gcc-7 constant overflow warning recordmcount: Fix memory leaks in the uwrite function sched: Fix KCSAN noinstr violation mcb-pci: Reallocate memory region to avoid memory overlapping serial: 8250: Reinit port->pm on port specific driver unbind usb: typec: tcpm: fix multiple times discover svids error HID: wacom: generic: Set battery quirk only when we see battery data spi: spi-imx: fix MX51_ECSPI_* macros when cs > 3 HID: logitech-hidpp: Reconcile USB and Unifying serials HID: logitech-hidpp: Don't use the USB serial for USB devices staging: rtl8192e: Replace macro RTL_PCI_DEVICE with PCI_DEVICE Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp wifi: iwlwifi: dvm: Fix memcpy: detected field-spanning write backtrace f2fs: fix to drop all dirty pages during umount() if cp_error is set ext4: Fix best extent lstart adjustment logic in ext4_mb_new_inode_pa() ext4: set goal start correctly in ext4_mb_normalize_request gfs2: Fix inode height consistency check scsi: message: mptlan: Fix use after free bug in mptlan_remove() due to race condition lib: cpu_rmap: Avoid use after free on rmap->obj array entries net: Catch invalid index in XPS mapping net: pasemi: Fix return type of pasemi_mac_start_tx() ext2: Check block size validity during mount wifi: brcmfmac: cfg80211: Pass the PMK in binary instead of hex ACPICA: ACPICA: check null return of ACPI_ALLOCATE_ZEROED in acpi_db_display_objects ACPICA: Avoid undefined behavior: applying zero offset to null pointer drm/tegra: Avoid potential 32-bit integer overflow ACPI: EC: Fix oops when removing custom query handlers firmware: arm_sdei: Fix sleep from invalid context BUG memstick: r592: Fix UAF bug in r592_remove due to race condition regmap: cache: Return error in cache sync operations for REGCACHE_NONE drm/amd/display: Use DC_LOG_DC in the trasform pixel function fs: hfsplus: remove WARN_ON() from hfsplus_cat_{read,write}_inode() af_unix: Fix data races around sk->sk_shutdown. af_unix: Fix a data race of sk->sk_receive_queue->qlen. net: datagram: fix data-races in datagram_poll() ipvlan:Fix out-of-bounds caused by unclear skb->cb tcp: add annotations around sk->sk_shutdown accesses tcp: factor out __tcp_close() helper tcp: return EPOLLOUT from tcp_poll only when notsent_bytes is half the limit tcp: reduce POLLOUT events caused by TCP_NOTSENT_LOWAT net: annotate sk->sk_err write from do_recvmmsg() netlink: annotate accesses to nlk->cb_running net: Fix load-tearing on sk->sk_stamp in sock_recv_cmsgs(). Linux 4.19.283 mm/page_alloc: fix potential deadlock on zonelist_update_seq seqlock printk: declare printk_deferred_{enter,safe}() in include/linux/printk.h PCI: pciehp: Fix AB-BA deadlock between reset_lock and device_lock PCI: pciehp: Use down_read/write_nested(reset_lock) to fix lockdep errors drbd: correctly submit flush bio on barrier serial: 8250: Fix serial8250_tx_empty() race with DMA Tx tty: Prevent writing chars during tcsetattr TCSADRAIN/FLUSH ext4: fix invalid free tracking in ext4_xattr_move_to_block() ext4: remove a BUG_ON in ext4_mb_release_group_pa() ext4: bail out of ext4_xattr_ibody_get() fails for any reason ext4: add bounds checking in get_max_inline_xattr_value_size() ext4: improve error recovery code paths in __ext4_remount() ext4: avoid a potential slab-out-of-bounds in ext4_group_desc_csum ext4: fix WARNING in mb_find_extent HID: wacom: Set a default resolution for older tablets drm/panel: otm8009a: Set backlight parent to panel device ARM: dts: s5pv210: correct MIPI CSIS clock name ARM: dts: exynos: fix WM8960 clock name in Itop Elite sh: nmi_debug: fix return value of __setup handler sh: init: use OF_EARLY_FLATTREE for early init sh: math-emu: fix macro redefined warning platform/x86: touchscreen_dmi: Add info for the Dexp Ursus KX210i cifs: fix pcchunk length type in smb2_copychunk_range btrfs: print-tree: parent bytenr must be aligned to sector size btrfs: fix btrfs_prev_leaf() to not return the same key twice perf symbols: Fix return incorrect build_id size in elf_read_build_id() perf map: Delete two variable initialisations before null pointer checks in sort__sym_from_cmp() perf vendor events power9: Remove UTF-8 characters from JSON files virtio_net: suppress cpu stall when free_unused_bufs virtio_net: split free_unused_bufs() ALSA: caiaq: input: Add error handling for unsupported input methods in `snd_usb_caiaq_input_init` drm/amdgpu: add a missing lock for AMDGPU_SCHED drm/amdgpu: Add command to override the context priority. drm/amdgpu: Put enable gfx off feature to a delay thread drm/amdgpu: Add amdgpu_gfx_off_ctrl function af_packet: Don't send zero-byte data in packet_sendmsg_spkt(). rxrpc: Fix hard call timeout units net/sched: act_mirred: Add carrier check writeback: fix call of incorrect macro net: dsa: mv88e6xxx: add mv88e6321 rsvd2cpu net: dsa: mv88e6xxx: Add missing watchdog ops for 6320 family sit: update dev->needed_headroom in ipip6_tunnel_bind_dev() relayfs: fix out-of-bounds access in relay_file_read kernel/relay.c: fix read_pos error when multiple readers dm verity: fix error handling for check_at_most_once on FEC dm verity: skip redundant verity_handle_err() on I/O errors ipmi: fix SSIF not responding under certain cond. ipmi_ssif: Rename idle state and check ipmi: Fix how the lower layers are told to watch for messages ipmi: Fix SSIF flag requests tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem nohz: Add TICK_DEP_BIT_RCU netfilter: nf_tables: deactivate anonymous set from preparation phase debugobject: Ensure pool refill (again) perf auxtrace: Fix address filter entire kernel size dm ioctl: fix nested locking in table_clear() to remove deadlock concern dm flakey: fix a crash with invalid table line dm integrity: call kmem_cache_destroy() in dm_integrity_init() error path s390/dasd: fix hanging blockdevice after request requeue btrfs: scrub: reject unsupported scrub flags clk: rockchip: rk3399: allow clk_cifout to force clk_cifout_src to reparent wifi: rtl8xxxu: RTL8192EU always needs full init md/raid10: fix null-ptr-deref in raid10_sync_request nilfs2: fix infinite loop in nilfs_mdt_get_block() nilfs2: do not write dirty data after degenerating to read-only parisc: Fix argument pointer in real64_call_asm() dmaengine: at_xdmac: do not enable all cyclic channels phy: tegra: xusb: Add missing tegra_xusb_port_unregister for usb2_port and ulpi_port pwm: mtk-disp: Disable shadow registers before setting backlight values pwm: mtk-disp: Adjust the clocks to avoid them mismatch pwm: mtk-disp: Don't check the return code of pwmchip_remove() openrisc: Properly store r31 to pt_regs on unhandled exceptions RDMA/mlx5: Use correct device num_ports when modify DC SUNRPC: remove the maximum number of retries in call_bind_status NFSv4.1: Always send a RECLAIM_COMPLETE after establishing lease IB/hfi1: Fix SDMA mmu_rb_node not being evicted in LRU order clk: add missing of_node_put() in "assigned-clocks" property parsing power: supply: generic-adc-battery: fix unit scaling RDMA/mlx4: Prevent shift wrapping in set_user_sq_size() RDMA/rdmavt: Delete unnecessary NULL check perf/core: Fix hardlockup failure caused by perf throttle powerpc/rtas: use memmove for potentially overlapping buffer copy macintosh: via-pmu-led: requires ATA to be set powerpc/sysdev/tsi108: fix resource printk format warnings powerpc/wii: fix resource printk format warnings powerpc/mpc512x: fix resource printk format warning macintosh/windfarm_smu_sat: Add missing of_node_put() spmi: Add a check for remove callback when removing a SPMI driver staging: rtl8192e: Fix W_DISABLE# does not work after stop/start serial: 8250: Add missing wakeup event reporting tty: serial: fsl_lpuart: adjust buffer length to the intended size usb: chipidea: fix missing goto in `ci_hdrc_probe` sh: sq: Fix incorrect element size for allocating bitmap buffer uapi/linux/const.h: prefer ISO-friendly __typeof__ spi: cadence-quadspi: fix suspend-resume implementations mtd: spi-nor: cadence-quadspi: Handle probe deferral while requesting DMA channel mtd: spi-nor: cadence-quadspi: Don't initialize rx_dma_complete on failure mtd: spi-nor: cadence-quadspi: Make driver independent of flash geometry ia64: salinfo: placate defined-but-not-used warning ia64: mm/contig: fix section mismatch warning/error of: Fix modalias string generation vmci_host: fix a race condition in vmci_host_poll() causing GPF spi: fsl-spi: Fix CPM/QE mode Litte Endian spi: qup: Don't skip cleanup in remove's error path spi: qup: fix PM reference leak in spi_qup_remove() linux/vt_buffer.h: allow either builtin or modular for macros usb: gadget: udc: renesas_usb3: Fix use after free bug in renesas_usb3_remove due to race condition fpga: bridge: fix kernel-doc parameter description usb: host: xhci-rcar: remove leftover quirk handling pstore: Revert pmsg_lock back to a normal mutex tcp/udp: Fix memleaks of sk and zerocopy skbs with TX timestamp. net: amd: Fix link leak when verifying config failed netlink: Use copy_to_user() for optval in netlink_getsockopt(). Revert "Bluetooth: btsdio: fix use after free bug in btsdio_remove due to unfinished work" ipv4: Fix potential uninit variable access bug in __ip_make_skb() netfilter: nf_tables: don't write table validation state without mutex ixgbe: Enable setting RSS table to default values ixgbe: Allow flow hash to be set via ethtool wifi: iwlwifi: mvm: check firmware response size wifi: iwlwifi: make the loop for card preparation effective md/raid10: fix memleak of md thread md: update the optimal I/O size on reshape md/raid10: fix memleak for 'conf->bio_split' md/raid10: fix leak of 'r10bio->remaining' for recovery crypto: drbg - Only fail when jent is unavailable in FIPS mode crypto: drbg - make drbg_prepare_hrng() handle jent instantiation errors bpftool: Fix bug for long instructions in program CFG dumps wifi: rtlwifi: fix incorrect error codes in rtl_debugfs_set_write_reg() wifi: rtlwifi: fix incorrect error codes in rtl_debugfs_set_write_rfreg() rtlwifi: Replace RT_TRACE with rtl_dbg rtlwifi: Start changing RT_TRACE into rtl_dbg rtlwifi: rtl_pci: Fix memory leak when hardware init fails scsi: megaraid: Fix mega_cmd_done() CMDID_INT_CMDS scsi: target: iscsit: Fix TAS handling during conn cleanup net/packet: convert po->auxdata to an atomic flag net/packet: convert po->origdev to an atomic flag vlan: partially enable SIOCSHWTSTAMP in container scm: fix MSG_CTRUNC setting condition for SO_PASSSEC tools: bpftool: Remove invalid \' json escape wifi: ath6kl: reduce WARN to dev_dbg() in callback wifi: ath5k: fix an off by one check in ath5k_eeprom_read_freq_list() wifi: ath9k: hif_usb: fix memory leak of remain_skbs wifi: ath6kl: minor fix for allocation size debugobject: Prevent init race with static objects debugobjects: Move printk out of db->lock critical sections debugobjects: Add percpu free pools arm64: kgdb: Set PSTATE.SS to 1 to re-enable single-step x86/ioapic: Don't return 0 from arch_dynirq_lower_bound() media: rc: gpio-ir-recv: Fix support for wake-up media: rcar_fdp1: Fix refcount leak in probe and remove function media: rcar_fdp1: Fix the correct variable assignments media: saa7134: fix use after free bug in saa7134_finidev due to race condition media: dm1105: Fix use after free bug in dm1105_remove due to race condition x86/apic: Fix atomic update of offset in reserve_eilvt_offset() drm/msm/adreno: drop bogus pm_runtime_set_active() drm/msm/adreno: Defer enabling runpm until hw_init() firmware: qcom_scm: Clear download bit during reboot media: av7110: prevent underflow in write_ts_to_decoder() media: uapi: add MEDIA_BUS_FMT_METADATA_FIXED media bus format. media: bdisp: Add missing check for create_workqueue ARM: dts: qcom: ipq4019: Fix the PCI I/O port range EDAC/skx: Fix overflows on the DRAM row address mapping arrays EDAC, skx: Move debugfs node under EDAC's hierarchy drm/probe-helper: Cancel previous job before starting new one drm/vgem: add missing mutex_destroy drm/rockchip: Drop unbalanced obj unref selinux: ensure av_permissions.h is built when needed selinux: fix Makefile dependencies of flask.h ubifs: Free memory for tmpfile name ubi: Fix return value overwrite issue in try_write_vid_and_data() ubifs: Fix memleak when insert_old_idx() failed Revert "ubifs: dirty_cow_znode: Fix memleak in error handling path" i2c: omap: Fix standard mode false ACK readings KVM: nVMX: Emulate NOPs in L2, and PAUSE if it's not intercepted reiserfs: Add security prefix to xattr name in reiserfs_security_write() ring-buffer: Sync IRQ works before buffer destruction pwm: meson: Fix axg ao mux parents MIPS: fw: Allow firmware to pass a empty env xhci: fix debugfs register accesses while suspended debugfs: regset32: Add Runtime PM support staging: iio: resolver: ads1210: fix config mode perf sched: Cast PTHREAD_STACK_MIN to int as it may turn into sysconf(__SC_THREAD_STACK_MIN_VALUE) USB: dwc3: fix runtime pm imbalance on unbind stmmac: debugfs entry name is not be changed when udev rename device name. ASoC: Intel: bytcr_rt5640: Add quirk for the Acer Iconia One 7 B1-750 iio: adc: palmas_gpadc: fix NULL dereference on rmmod USB: serial: option: add UNISOC vendor and TOZED LT70C product bluetooth: Perform careful capability checks in hci_sock_ioctl() wifi: brcmfmac: slab-out-of-bounds read in brcmf_get_assoc_ies() Conflicts: drivers/media/dvb-core/dvb_demux.c drivers/usb/dwc3/core.c drivers/usb/gadget/function/f_fs.c drivers/usb/gadget/function/f_ncm.c include/net/pkt_sched.h Change-Id: I5081b8f3529f4df573736bf7d69201f777754b74
3378 lines
82 KiB
C
3378 lines
82 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* 'tty_io.c' gives an orthogonal feeling to tty's, be they consoles
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* or rs-channels. It also implements echoing, cooked mode etc.
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*
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* Kill-line thanks to John T Kohl, who also corrected VMIN = VTIME = 0.
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*
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* Modified by Theodore Ts'o, 9/14/92, to dynamically allocate the
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* tty_struct and tty_queue structures. Previously there was an array
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* of 256 tty_struct's which was statically allocated, and the
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* tty_queue structures were allocated at boot time. Both are now
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* dynamically allocated only when the tty is open.
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*
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* Also restructured routines so that there is more of a separation
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* between the high-level tty routines (tty_io.c and tty_ioctl.c) and
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* the low-level tty routines (serial.c, pty.c, console.c). This
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* makes for cleaner and more compact code. -TYT, 9/17/92
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*
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* Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
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* which can be dynamically activated and de-activated by the line
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* discipline handling modules (like SLIP).
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*
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* NOTE: pay no attention to the line discipline code (yet); its
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* interface is still subject to change in this version...
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* -- TYT, 1/31/92
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*
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* Added functionality to the OPOST tty handling. No delays, but all
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* other bits should be there.
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* -- Nick Holloway <alfie@dcs.warwick.ac.uk>, 27th May 1993.
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*
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* Rewrote canonical mode and added more termios flags.
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* -- julian@uhunix.uhcc.hawaii.edu (J. Cowley), 13Jan94
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*
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* Reorganized FASYNC support so mouse code can share it.
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* -- ctm@ardi.com, 9Sep95
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*
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* New TIOCLINUX variants added.
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* -- mj@k332.feld.cvut.cz, 19-Nov-95
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*
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* Restrict vt switching via ioctl()
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* -- grif@cs.ucr.edu, 5-Dec-95
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*
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* Move console and virtual terminal code to more appropriate files,
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* implement CONFIG_VT and generalize console device interface.
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* -- Marko Kohtala <Marko.Kohtala@hut.fi>, March 97
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*
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* Rewrote tty_init_dev and tty_release_dev to eliminate races.
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* -- Bill Hawes <whawes@star.net>, June 97
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*
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* Added devfs support.
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* -- C. Scott Ananian <cananian@alumni.princeton.edu>, 13-Jan-1998
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*
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* Added support for a Unix98-style ptmx device.
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* -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
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*
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* Reduced memory usage for older ARM systems
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* -- Russell King <rmk@arm.linux.org.uk>
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*
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* Move do_SAK() into process context. Less stack use in devfs functions.
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* alloc_tty_struct() always uses kmalloc()
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* -- Andrew Morton <andrewm@uow.edu.eu> 17Mar01
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*/
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#include <linux/types.h>
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#include <linux/major.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/fcntl.h>
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#include <linux/sched/signal.h>
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#include <linux/sched/task.h>
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#include <linux/interrupt.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/devpts_fs.h>
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#include <linux/file.h>
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#include <linux/fdtable.h>
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#include <linux/console.h>
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#include <linux/timer.h>
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#include <linux/ctype.h>
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#include <linux/kd.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/seq_file.h>
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#include <linux/serial.h>
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#include <linux/ratelimit.h>
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#include <linux/uaccess.h>
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#include <linux/kbd_kern.h>
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#include <linux/vt_kern.h>
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#include <linux/selection.h>
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#include <linux/kmod.h>
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#include <linux/nsproxy.h>
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#undef TTY_DEBUG_HANGUP
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#ifdef TTY_DEBUG_HANGUP
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# define tty_debug_hangup(tty, f, args...) tty_debug(tty, f, ##args)
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#else
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# define tty_debug_hangup(tty, f, args...) do { } while (0)
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#endif
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#define TTY_PARANOIA_CHECK 1
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#define CHECK_TTY_COUNT 1
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struct ktermios tty_std_termios = { /* for the benefit of tty drivers */
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.c_iflag = ICRNL | IXON,
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.c_oflag = OPOST | ONLCR,
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.c_cflag = B38400 | CS8 | CREAD | HUPCL,
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.c_lflag = ISIG | ICANON | ECHO | ECHOE | ECHOK |
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ECHOCTL | ECHOKE | IEXTEN,
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.c_cc = INIT_C_CC,
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.c_ispeed = 38400,
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.c_ospeed = 38400,
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/* .c_line = N_TTY, */
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};
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EXPORT_SYMBOL(tty_std_termios);
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/* This list gets poked at by procfs and various bits of boot up code. This
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could do with some rationalisation such as pulling the tty proc function
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into this file */
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LIST_HEAD(tty_drivers); /* linked list of tty drivers */
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/* Mutex to protect creating and releasing a tty */
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DEFINE_MUTEX(tty_mutex);
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static ssize_t tty_read(struct file *, char __user *, size_t, loff_t *);
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static ssize_t tty_write(struct file *, const char __user *, size_t, loff_t *);
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ssize_t redirected_tty_write(struct file *, const char __user *,
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size_t, loff_t *);
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static __poll_t tty_poll(struct file *, poll_table *);
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static int tty_open(struct inode *, struct file *);
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long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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#ifdef CONFIG_COMPAT
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static long tty_compat_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg);
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#else
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#define tty_compat_ioctl NULL
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#endif
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static int __tty_fasync(int fd, struct file *filp, int on);
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static int tty_fasync(int fd, struct file *filp, int on);
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static void release_tty(struct tty_struct *tty, int idx);
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/**
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* free_tty_struct - free a disused tty
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* @tty: tty struct to free
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*
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* Free the write buffers, tty queue and tty memory itself.
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*
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* Locking: none. Must be called after tty is definitely unused
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*/
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static void free_tty_struct(struct tty_struct *tty)
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{
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tty_ldisc_deinit(tty);
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put_device(tty->dev);
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kfree(tty->write_buf);
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tty->magic = 0xDEADDEAD;
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kfree(tty);
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}
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static inline struct tty_struct *file_tty(struct file *file)
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{
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return ((struct tty_file_private *)file->private_data)->tty;
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}
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int tty_alloc_file(struct file *file)
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{
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struct tty_file_private *priv;
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priv = kmalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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file->private_data = priv;
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return 0;
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}
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/* Associate a new file with the tty structure */
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void tty_add_file(struct tty_struct *tty, struct file *file)
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{
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struct tty_file_private *priv = file->private_data;
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priv->tty = tty;
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priv->file = file;
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spin_lock(&tty->files_lock);
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list_add(&priv->list, &tty->tty_files);
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spin_unlock(&tty->files_lock);
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}
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/**
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* tty_free_file - free file->private_data
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*
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* This shall be used only for fail path handling when tty_add_file was not
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* called yet.
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*/
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void tty_free_file(struct file *file)
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{
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struct tty_file_private *priv = file->private_data;
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file->private_data = NULL;
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kfree(priv);
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}
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/* Delete file from its tty */
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static void tty_del_file(struct file *file)
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{
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struct tty_file_private *priv = file->private_data;
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struct tty_struct *tty = priv->tty;
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spin_lock(&tty->files_lock);
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list_del(&priv->list);
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spin_unlock(&tty->files_lock);
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tty_free_file(file);
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}
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/**
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* tty_name - return tty naming
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* @tty: tty structure
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*
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* Convert a tty structure into a name. The name reflects the kernel
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* naming policy and if udev is in use may not reflect user space
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*
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* Locking: none
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*/
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const char *tty_name(const struct tty_struct *tty)
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{
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if (!tty) /* Hmm. NULL pointer. That's fun. */
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return "NULL tty";
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return tty->name;
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}
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EXPORT_SYMBOL(tty_name);
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const char *tty_driver_name(const struct tty_struct *tty)
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{
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if (!tty || !tty->driver)
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return "";
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return tty->driver->name;
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}
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static int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
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const char *routine)
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{
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#ifdef TTY_PARANOIA_CHECK
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if (!tty) {
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pr_warn("(%d:%d): %s: NULL tty\n",
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imajor(inode), iminor(inode), routine);
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return 1;
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}
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if (tty->magic != TTY_MAGIC) {
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pr_warn("(%d:%d): %s: bad magic number\n",
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imajor(inode), iminor(inode), routine);
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return 1;
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}
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#endif
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return 0;
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}
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/* Caller must hold tty_lock */
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static int check_tty_count(struct tty_struct *tty, const char *routine)
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{
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#ifdef CHECK_TTY_COUNT
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struct list_head *p;
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int count = 0, kopen_count = 0;
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spin_lock(&tty->files_lock);
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list_for_each(p, &tty->tty_files) {
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count++;
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}
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spin_unlock(&tty->files_lock);
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if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
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tty->driver->subtype == PTY_TYPE_SLAVE &&
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tty->link && tty->link->count)
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count++;
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if (tty_port_kopened(tty->port))
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kopen_count++;
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if (tty->count != (count + kopen_count)) {
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tty_warn(tty, "%s: tty->count(%d) != (#fd's(%d) + #kopen's(%d))\n",
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routine, tty->count, count, kopen_count);
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return (count + kopen_count);
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}
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#endif
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return 0;
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}
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/**
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* get_tty_driver - find device of a tty
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* @dev_t: device identifier
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* @index: returns the index of the tty
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*
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* This routine returns a tty driver structure, given a device number
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* and also passes back the index number.
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*
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* Locking: caller must hold tty_mutex
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*/
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static struct tty_driver *get_tty_driver(dev_t device, int *index)
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{
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struct tty_driver *p;
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list_for_each_entry(p, &tty_drivers, tty_drivers) {
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dev_t base = MKDEV(p->major, p->minor_start);
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if (device < base || device >= base + p->num)
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continue;
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*index = device - base;
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return tty_driver_kref_get(p);
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}
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return NULL;
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}
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/**
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* tty_dev_name_to_number - return dev_t for device name
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* @name: user space name of device under /dev
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* @number: pointer to dev_t that this function will populate
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*
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* This function converts device names like ttyS0 or ttyUSB1 into dev_t
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* like (4, 64) or (188, 1). If no corresponding driver is registered then
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* the function returns -ENODEV.
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*
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* Locking: this acquires tty_mutex to protect the tty_drivers list from
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* being modified while we are traversing it, and makes sure to
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* release it before exiting.
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*/
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int tty_dev_name_to_number(const char *name, dev_t *number)
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{
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struct tty_driver *p;
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int ret;
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int index, prefix_length = 0;
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const char *str;
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for (str = name; *str && !isdigit(*str); str++)
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;
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if (!*str)
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return -EINVAL;
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ret = kstrtoint(str, 10, &index);
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if (ret)
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return ret;
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prefix_length = str - name;
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mutex_lock(&tty_mutex);
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list_for_each_entry(p, &tty_drivers, tty_drivers)
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if (prefix_length == strlen(p->name) && strncmp(name,
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p->name, prefix_length) == 0) {
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if (index < p->num) {
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*number = MKDEV(p->major, p->minor_start + index);
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goto out;
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}
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}
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/* if here then driver wasn't found */
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ret = -ENODEV;
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out:
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mutex_unlock(&tty_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tty_dev_name_to_number);
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#ifdef CONFIG_CONSOLE_POLL
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/**
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* tty_find_polling_driver - find device of a polled tty
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* @name: name string to match
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* @line: pointer to resulting tty line nr
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*
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* This routine returns a tty driver structure, given a name
|
|
* and the condition that the tty driver is capable of polled
|
|
* operation.
|
|
*/
|
|
struct tty_driver *tty_find_polling_driver(char *name, int *line)
|
|
{
|
|
struct tty_driver *p, *res = NULL;
|
|
int tty_line = 0;
|
|
int len;
|
|
char *str, *stp;
|
|
|
|
for (str = name; *str; str++)
|
|
if ((*str >= '0' && *str <= '9') || *str == ',')
|
|
break;
|
|
if (!*str)
|
|
return NULL;
|
|
|
|
len = str - name;
|
|
tty_line = simple_strtoul(str, &str, 10);
|
|
|
|
mutex_lock(&tty_mutex);
|
|
/* Search through the tty devices to look for a match */
|
|
list_for_each_entry(p, &tty_drivers, tty_drivers) {
|
|
if (!len || strncmp(name, p->name, len) != 0)
|
|
continue;
|
|
stp = str;
|
|
if (*stp == ',')
|
|
stp++;
|
|
if (*stp == '\0')
|
|
stp = NULL;
|
|
|
|
if (tty_line >= 0 && tty_line < p->num && p->ops &&
|
|
p->ops->poll_init && !p->ops->poll_init(p, tty_line, stp)) {
|
|
res = tty_driver_kref_get(p);
|
|
*line = tty_line;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&tty_mutex);
|
|
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_find_polling_driver);
|
|
#endif
|
|
|
|
static ssize_t hung_up_tty_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hung_up_tty_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
return -EIO;
|
|
}
|
|
|
|
/* No kernel lock held - none needed ;) */
|
|
static __poll_t hung_up_tty_poll(struct file *filp, poll_table *wait)
|
|
{
|
|
return EPOLLIN | EPOLLOUT | EPOLLERR | EPOLLHUP | EPOLLRDNORM | EPOLLWRNORM;
|
|
}
|
|
|
|
static long hung_up_tty_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
|
|
}
|
|
|
|
static long hung_up_tty_compat_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
|
|
}
|
|
|
|
static int hung_up_tty_fasync(int fd, struct file *file, int on)
|
|
{
|
|
return -ENOTTY;
|
|
}
|
|
|
|
static void tty_show_fdinfo(struct seq_file *m, struct file *file)
|
|
{
|
|
struct tty_struct *tty = file_tty(file);
|
|
|
|
if (tty && tty->ops && tty->ops->show_fdinfo)
|
|
tty->ops->show_fdinfo(tty, m);
|
|
}
|
|
|
|
static const struct file_operations tty_fops = {
|
|
.llseek = no_llseek,
|
|
.read = tty_read,
|
|
.write = tty_write,
|
|
.poll = tty_poll,
|
|
.unlocked_ioctl = tty_ioctl,
|
|
.compat_ioctl = tty_compat_ioctl,
|
|
.open = tty_open,
|
|
.release = tty_release,
|
|
.fasync = tty_fasync,
|
|
.show_fdinfo = tty_show_fdinfo,
|
|
};
|
|
|
|
static const struct file_operations console_fops = {
|
|
.llseek = no_llseek,
|
|
.read = tty_read,
|
|
.write = redirected_tty_write,
|
|
.poll = tty_poll,
|
|
.unlocked_ioctl = tty_ioctl,
|
|
.compat_ioctl = tty_compat_ioctl,
|
|
.open = tty_open,
|
|
.release = tty_release,
|
|
.fasync = tty_fasync,
|
|
};
|
|
|
|
static const struct file_operations hung_up_tty_fops = {
|
|
.llseek = no_llseek,
|
|
.read = hung_up_tty_read,
|
|
.write = hung_up_tty_write,
|
|
.poll = hung_up_tty_poll,
|
|
.unlocked_ioctl = hung_up_tty_ioctl,
|
|
.compat_ioctl = hung_up_tty_compat_ioctl,
|
|
.release = tty_release,
|
|
.fasync = hung_up_tty_fasync,
|
|
};
|
|
|
|
static DEFINE_SPINLOCK(redirect_lock);
|
|
static struct file *redirect;
|
|
|
|
extern void tty_sysctl_init(void);
|
|
|
|
/**
|
|
* tty_wakeup - request more data
|
|
* @tty: terminal
|
|
*
|
|
* Internal and external helper for wakeups of tty. This function
|
|
* informs the line discipline if present that the driver is ready
|
|
* to receive more output data.
|
|
*/
|
|
|
|
void tty_wakeup(struct tty_struct *tty)
|
|
{
|
|
struct tty_ldisc *ld;
|
|
|
|
if (test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags)) {
|
|
ld = tty_ldisc_ref(tty);
|
|
if (ld) {
|
|
if (ld->ops->write_wakeup)
|
|
ld->ops->write_wakeup(tty);
|
|
tty_ldisc_deref(ld);
|
|
}
|
|
}
|
|
wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT);
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(tty_wakeup);
|
|
|
|
/**
|
|
* __tty_hangup - actual handler for hangup events
|
|
* @work: tty device
|
|
*
|
|
* This can be called by a "kworker" kernel thread. That is process
|
|
* synchronous but doesn't hold any locks, so we need to make sure we
|
|
* have the appropriate locks for what we're doing.
|
|
*
|
|
* The hangup event clears any pending redirections onto the hung up
|
|
* device. It ensures future writes will error and it does the needed
|
|
* line discipline hangup and signal delivery. The tty object itself
|
|
* remains intact.
|
|
*
|
|
* Locking:
|
|
* BTM
|
|
* redirect lock for undoing redirection
|
|
* file list lock for manipulating list of ttys
|
|
* tty_ldiscs_lock from called functions
|
|
* termios_rwsem resetting termios data
|
|
* tasklist_lock to walk task list for hangup event
|
|
* ->siglock to protect ->signal/->sighand
|
|
*/
|
|
static void __tty_hangup(struct tty_struct *tty, int exit_session)
|
|
{
|
|
struct file *cons_filp = NULL;
|
|
struct file *filp, *f = NULL;
|
|
struct tty_file_private *priv;
|
|
int closecount = 0, n;
|
|
int refs;
|
|
|
|
if (!tty)
|
|
return;
|
|
|
|
|
|
spin_lock(&redirect_lock);
|
|
if (redirect && file_tty(redirect) == tty) {
|
|
f = redirect;
|
|
redirect = NULL;
|
|
}
|
|
spin_unlock(&redirect_lock);
|
|
|
|
tty_lock(tty);
|
|
|
|
if (test_bit(TTY_HUPPED, &tty->flags)) {
|
|
tty_unlock(tty);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Some console devices aren't actually hung up for technical and
|
|
* historical reasons, which can lead to indefinite interruptible
|
|
* sleep in n_tty_read(). The following explicitly tells
|
|
* n_tty_read() to abort readers.
|
|
*/
|
|
set_bit(TTY_HUPPING, &tty->flags);
|
|
|
|
/* inuse_filps is protected by the single tty lock,
|
|
this really needs to change if we want to flush the
|
|
workqueue with the lock held */
|
|
check_tty_count(tty, "tty_hangup");
|
|
|
|
spin_lock(&tty->files_lock);
|
|
/* This breaks for file handles being sent over AF_UNIX sockets ? */
|
|
list_for_each_entry(priv, &tty->tty_files, list) {
|
|
filp = priv->file;
|
|
if (filp->f_op->write == redirected_tty_write)
|
|
cons_filp = filp;
|
|
if (filp->f_op->write != tty_write)
|
|
continue;
|
|
closecount++;
|
|
__tty_fasync(-1, filp, 0); /* can't block */
|
|
filp->f_op = &hung_up_tty_fops;
|
|
}
|
|
spin_unlock(&tty->files_lock);
|
|
|
|
refs = tty_signal_session_leader(tty, exit_session);
|
|
/* Account for the p->signal references we killed */
|
|
while (refs--)
|
|
tty_kref_put(tty);
|
|
|
|
tty_ldisc_hangup(tty, cons_filp != NULL);
|
|
|
|
spin_lock_irq(&tty->ctrl_lock);
|
|
clear_bit(TTY_THROTTLED, &tty->flags);
|
|
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
|
|
put_pid(tty->session);
|
|
put_pid(tty->pgrp);
|
|
tty->session = NULL;
|
|
tty->pgrp = NULL;
|
|
tty->ctrl_status = 0;
|
|
spin_unlock_irq(&tty->ctrl_lock);
|
|
|
|
/*
|
|
* If one of the devices matches a console pointer, we
|
|
* cannot just call hangup() because that will cause
|
|
* tty->count and state->count to go out of sync.
|
|
* So we just call close() the right number of times.
|
|
*/
|
|
if (cons_filp) {
|
|
if (tty->ops->close)
|
|
for (n = 0; n < closecount; n++)
|
|
tty->ops->close(tty, cons_filp);
|
|
} else if (tty->ops->hangup)
|
|
tty->ops->hangup(tty);
|
|
/*
|
|
* We don't want to have driver/ldisc interactions beyond the ones
|
|
* we did here. The driver layer expects no calls after ->hangup()
|
|
* from the ldisc side, which is now guaranteed.
|
|
*/
|
|
set_bit(TTY_HUPPED, &tty->flags);
|
|
clear_bit(TTY_HUPPING, &tty->flags);
|
|
tty_unlock(tty);
|
|
|
|
if (f)
|
|
fput(f);
|
|
}
|
|
|
|
static void do_tty_hangup(struct work_struct *work)
|
|
{
|
|
struct tty_struct *tty =
|
|
container_of(work, struct tty_struct, hangup_work);
|
|
|
|
__tty_hangup(tty, 0);
|
|
}
|
|
|
|
/**
|
|
* tty_hangup - trigger a hangup event
|
|
* @tty: tty to hangup
|
|
*
|
|
* A carrier loss (virtual or otherwise) has occurred on this like
|
|
* schedule a hangup sequence to run after this event.
|
|
*/
|
|
|
|
void tty_hangup(struct tty_struct *tty)
|
|
{
|
|
tty_debug_hangup(tty, "hangup\n");
|
|
schedule_work(&tty->hangup_work);
|
|
}
|
|
|
|
EXPORT_SYMBOL(tty_hangup);
|
|
|
|
/**
|
|
* tty_vhangup - process vhangup
|
|
* @tty: tty to hangup
|
|
*
|
|
* The user has asked via system call for the terminal to be hung up.
|
|
* We do this synchronously so that when the syscall returns the process
|
|
* is complete. That guarantee is necessary for security reasons.
|
|
*/
|
|
|
|
void tty_vhangup(struct tty_struct *tty)
|
|
{
|
|
tty_debug_hangup(tty, "vhangup\n");
|
|
__tty_hangup(tty, 0);
|
|
}
|
|
|
|
EXPORT_SYMBOL(tty_vhangup);
|
|
|
|
|
|
/**
|
|
* tty_vhangup_self - process vhangup for own ctty
|
|
*
|
|
* Perform a vhangup on the current controlling tty
|
|
*/
|
|
|
|
void tty_vhangup_self(void)
|
|
{
|
|
struct tty_struct *tty;
|
|
|
|
tty = get_current_tty();
|
|
if (tty) {
|
|
tty_vhangup(tty);
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tty_vhangup_session - hangup session leader exit
|
|
* @tty: tty to hangup
|
|
*
|
|
* The session leader is exiting and hanging up its controlling terminal.
|
|
* Every process in the foreground process group is signalled SIGHUP.
|
|
*
|
|
* We do this synchronously so that when the syscall returns the process
|
|
* is complete. That guarantee is necessary for security reasons.
|
|
*/
|
|
|
|
void tty_vhangup_session(struct tty_struct *tty)
|
|
{
|
|
tty_debug_hangup(tty, "session hangup\n");
|
|
__tty_hangup(tty, 1);
|
|
}
|
|
|
|
/**
|
|
* tty_hung_up_p - was tty hung up
|
|
* @filp: file pointer of tty
|
|
*
|
|
* Return true if the tty has been subject to a vhangup or a carrier
|
|
* loss
|
|
*/
|
|
|
|
int tty_hung_up_p(struct file *filp)
|
|
{
|
|
return (filp && filp->f_op == &hung_up_tty_fops);
|
|
}
|
|
|
|
EXPORT_SYMBOL(tty_hung_up_p);
|
|
|
|
/**
|
|
* stop_tty - propagate flow control
|
|
* @tty: tty to stop
|
|
*
|
|
* Perform flow control to the driver. May be called
|
|
* on an already stopped device and will not re-call the driver
|
|
* method.
|
|
*
|
|
* This functionality is used by both the line disciplines for
|
|
* halting incoming flow and by the driver. It may therefore be
|
|
* called from any context, may be under the tty atomic_write_lock
|
|
* but not always.
|
|
*
|
|
* Locking:
|
|
* flow_lock
|
|
*/
|
|
|
|
void __stop_tty(struct tty_struct *tty)
|
|
{
|
|
if (tty->stopped)
|
|
return;
|
|
tty->stopped = 1;
|
|
if (tty->ops->stop)
|
|
tty->ops->stop(tty);
|
|
}
|
|
|
|
void stop_tty(struct tty_struct *tty)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&tty->flow_lock, flags);
|
|
__stop_tty(tty);
|
|
spin_unlock_irqrestore(&tty->flow_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(stop_tty);
|
|
|
|
/**
|
|
* start_tty - propagate flow control
|
|
* @tty: tty to start
|
|
*
|
|
* Start a tty that has been stopped if at all possible. If this
|
|
* tty was previous stopped and is now being started, the driver
|
|
* start method is invoked and the line discipline woken.
|
|
*
|
|
* Locking:
|
|
* flow_lock
|
|
*/
|
|
|
|
void __start_tty(struct tty_struct *tty)
|
|
{
|
|
if (!tty->stopped || tty->flow_stopped)
|
|
return;
|
|
tty->stopped = 0;
|
|
if (tty->ops->start)
|
|
tty->ops->start(tty);
|
|
tty_wakeup(tty);
|
|
}
|
|
|
|
void start_tty(struct tty_struct *tty)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&tty->flow_lock, flags);
|
|
__start_tty(tty);
|
|
spin_unlock_irqrestore(&tty->flow_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(start_tty);
|
|
|
|
static void tty_update_time(struct timespec64 *time)
|
|
{
|
|
time64_t sec = ktime_get_real_seconds();
|
|
|
|
/*
|
|
* We only care if the two values differ in anything other than the
|
|
* lower three bits (i.e every 8 seconds). If so, then we can update
|
|
* the time of the tty device, otherwise it could be construded as a
|
|
* security leak to let userspace know the exact timing of the tty.
|
|
*/
|
|
if ((sec ^ time->tv_sec) & ~7)
|
|
time->tv_sec = sec;
|
|
}
|
|
|
|
/**
|
|
* tty_read - read method for tty device files
|
|
* @file: pointer to tty file
|
|
* @buf: user buffer
|
|
* @count: size of user buffer
|
|
* @ppos: unused
|
|
*
|
|
* Perform the read system call function on this terminal device. Checks
|
|
* for hung up devices before calling the line discipline method.
|
|
*
|
|
* Locking:
|
|
* Locks the line discipline internally while needed. Multiple
|
|
* read calls may be outstanding in parallel.
|
|
*/
|
|
|
|
static ssize_t tty_read(struct file *file, char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
int i;
|
|
struct inode *inode = file_inode(file);
|
|
struct tty_struct *tty = file_tty(file);
|
|
struct tty_ldisc *ld;
|
|
|
|
if (tty_paranoia_check(tty, inode, "tty_read"))
|
|
return -EIO;
|
|
if (!tty || tty_io_error(tty))
|
|
return -EIO;
|
|
|
|
/* We want to wait for the line discipline to sort out in this
|
|
situation */
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return hung_up_tty_read(file, buf, count, ppos);
|
|
if (ld->ops->read)
|
|
i = ld->ops->read(tty, file, buf, count);
|
|
else
|
|
i = -EIO;
|
|
tty_ldisc_deref(ld);
|
|
|
|
if (i > 0)
|
|
tty_update_time(&inode->i_atime);
|
|
|
|
return i;
|
|
}
|
|
|
|
void tty_write_unlock(struct tty_struct *tty)
|
|
{
|
|
mutex_unlock(&tty->atomic_write_lock);
|
|
wake_up_interruptible_poll(&tty->write_wait, EPOLLOUT);
|
|
}
|
|
|
|
int tty_write_lock(struct tty_struct *tty, int ndelay)
|
|
{
|
|
if (!mutex_trylock(&tty->atomic_write_lock)) {
|
|
if (ndelay)
|
|
return -EAGAIN;
|
|
if (mutex_lock_interruptible(&tty->atomic_write_lock))
|
|
return -ERESTARTSYS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Split writes up in sane blocksizes to avoid
|
|
* denial-of-service type attacks
|
|
*/
|
|
static inline ssize_t do_tty_write(
|
|
ssize_t (*write)(struct tty_struct *, struct file *, const unsigned char *, size_t),
|
|
struct tty_struct *tty,
|
|
struct file *file,
|
|
const char __user *buf,
|
|
size_t count)
|
|
{
|
|
ssize_t ret, written = 0;
|
|
unsigned int chunk;
|
|
|
|
ret = tty_write_lock(tty, file->f_flags & O_NDELAY);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* We chunk up writes into a temporary buffer. This
|
|
* simplifies low-level drivers immensely, since they
|
|
* don't have locking issues and user mode accesses.
|
|
*
|
|
* But if TTY_NO_WRITE_SPLIT is set, we should use a
|
|
* big chunk-size..
|
|
*
|
|
* The default chunk-size is 2kB, because the NTTY
|
|
* layer has problems with bigger chunks. It will
|
|
* claim to be able to handle more characters than
|
|
* it actually does.
|
|
*
|
|
* FIXME: This can probably go away now except that 64K chunks
|
|
* are too likely to fail unless switched to vmalloc...
|
|
*/
|
|
chunk = 2048;
|
|
if (test_bit(TTY_NO_WRITE_SPLIT, &tty->flags))
|
|
chunk = 65536;
|
|
if (count < chunk)
|
|
chunk = count;
|
|
|
|
/* write_buf/write_cnt is protected by the atomic_write_lock mutex */
|
|
if (tty->write_cnt < chunk) {
|
|
unsigned char *buf_chunk;
|
|
|
|
if (chunk < 1024)
|
|
chunk = 1024;
|
|
|
|
buf_chunk = kmalloc(chunk, GFP_KERNEL);
|
|
if (!buf_chunk) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
kfree(tty->write_buf);
|
|
tty->write_cnt = chunk;
|
|
tty->write_buf = buf_chunk;
|
|
}
|
|
|
|
/* Do the write .. */
|
|
for (;;) {
|
|
size_t size = count;
|
|
if (size > chunk)
|
|
size = chunk;
|
|
ret = -EFAULT;
|
|
if (copy_from_user(tty->write_buf, buf, size))
|
|
break;
|
|
ret = write(tty, file, tty->write_buf, size);
|
|
if (ret <= 0)
|
|
break;
|
|
written += ret;
|
|
buf += ret;
|
|
count -= ret;
|
|
if (!count)
|
|
break;
|
|
ret = -ERESTARTSYS;
|
|
if (signal_pending(current))
|
|
break;
|
|
cond_resched();
|
|
}
|
|
if (written) {
|
|
tty_update_time(&file_inode(file)->i_mtime);
|
|
ret = written;
|
|
}
|
|
out:
|
|
tty_write_unlock(tty);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* tty_write_message - write a message to a certain tty, not just the console.
|
|
* @tty: the destination tty_struct
|
|
* @msg: the message to write
|
|
*
|
|
* This is used for messages that need to be redirected to a specific tty.
|
|
* We don't put it into the syslog queue right now maybe in the future if
|
|
* really needed.
|
|
*
|
|
* We must still hold the BTM and test the CLOSING flag for the moment.
|
|
*/
|
|
|
|
void tty_write_message(struct tty_struct *tty, char *msg)
|
|
{
|
|
if (tty) {
|
|
mutex_lock(&tty->atomic_write_lock);
|
|
tty_lock(tty);
|
|
if (tty->ops->write && tty->count > 0)
|
|
tty->ops->write(tty, msg, strlen(msg));
|
|
tty_unlock(tty);
|
|
tty_write_unlock(tty);
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
/**
|
|
* tty_write - write method for tty device file
|
|
* @file: tty file pointer
|
|
* @buf: user data to write
|
|
* @count: bytes to write
|
|
* @ppos: unused
|
|
*
|
|
* Write data to a tty device via the line discipline.
|
|
*
|
|
* Locking:
|
|
* Locks the line discipline as required
|
|
* Writes to the tty driver are serialized by the atomic_write_lock
|
|
* and are then processed in chunks to the device. The line discipline
|
|
* write method will not be invoked in parallel for each device.
|
|
*/
|
|
|
|
static ssize_t tty_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct tty_struct *tty = file_tty(file);
|
|
struct tty_ldisc *ld;
|
|
ssize_t ret;
|
|
|
|
if (tty_paranoia_check(tty, file_inode(file), "tty_write"))
|
|
return -EIO;
|
|
if (!tty || !tty->ops->write || tty_io_error(tty))
|
|
return -EIO;
|
|
/* Short term debug to catch buggy drivers */
|
|
if (tty->ops->write_room == NULL)
|
|
tty_err(tty, "missing write_room method\n");
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return hung_up_tty_write(file, buf, count, ppos);
|
|
if (!ld->ops->write)
|
|
ret = -EIO;
|
|
else
|
|
ret = do_tty_write(ld->ops->write, tty, file, buf, count);
|
|
tty_ldisc_deref(ld);
|
|
return ret;
|
|
}
|
|
|
|
ssize_t redirected_tty_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct file *p = NULL;
|
|
|
|
spin_lock(&redirect_lock);
|
|
if (redirect)
|
|
p = get_file(redirect);
|
|
spin_unlock(&redirect_lock);
|
|
|
|
if (p) {
|
|
ssize_t res;
|
|
res = vfs_write(p, buf, count, &p->f_pos);
|
|
fput(p);
|
|
return res;
|
|
}
|
|
return tty_write(file, buf, count, ppos);
|
|
}
|
|
|
|
/**
|
|
* tty_send_xchar - send priority character
|
|
*
|
|
* Send a high priority character to the tty even if stopped
|
|
*
|
|
* Locking: none for xchar method, write ordering for write method.
|
|
*/
|
|
|
|
int tty_send_xchar(struct tty_struct *tty, char ch)
|
|
{
|
|
int was_stopped = tty->stopped;
|
|
|
|
if (tty->ops->send_xchar) {
|
|
down_read(&tty->termios_rwsem);
|
|
tty->ops->send_xchar(tty, ch);
|
|
up_read(&tty->termios_rwsem);
|
|
return 0;
|
|
}
|
|
|
|
if (tty_write_lock(tty, 0) < 0)
|
|
return -ERESTARTSYS;
|
|
|
|
down_read(&tty->termios_rwsem);
|
|
if (was_stopped)
|
|
start_tty(tty);
|
|
tty->ops->write(tty, &ch, 1);
|
|
if (was_stopped)
|
|
stop_tty(tty);
|
|
up_read(&tty->termios_rwsem);
|
|
tty_write_unlock(tty);
|
|
return 0;
|
|
}
|
|
|
|
static char ptychar[] = "pqrstuvwxyzabcde";
|
|
|
|
/**
|
|
* pty_line_name - generate name for a pty
|
|
* @driver: the tty driver in use
|
|
* @index: the minor number
|
|
* @p: output buffer of at least 6 bytes
|
|
*
|
|
* Generate a name from a driver reference and write it to the output
|
|
* buffer.
|
|
*
|
|
* Locking: None
|
|
*/
|
|
static void pty_line_name(struct tty_driver *driver, int index, char *p)
|
|
{
|
|
int i = index + driver->name_base;
|
|
/* ->name is initialized to "ttyp", but "tty" is expected */
|
|
sprintf(p, "%s%c%x",
|
|
driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name,
|
|
ptychar[i >> 4 & 0xf], i & 0xf);
|
|
}
|
|
|
|
/**
|
|
* tty_line_name - generate name for a tty
|
|
* @driver: the tty driver in use
|
|
* @index: the minor number
|
|
* @p: output buffer of at least 7 bytes
|
|
*
|
|
* Generate a name from a driver reference and write it to the output
|
|
* buffer.
|
|
*
|
|
* Locking: None
|
|
*/
|
|
static ssize_t tty_line_name(struct tty_driver *driver, int index, char *p)
|
|
{
|
|
if (driver->flags & TTY_DRIVER_UNNUMBERED_NODE)
|
|
return sprintf(p, "%s", driver->name);
|
|
else
|
|
return sprintf(p, "%s%d", driver->name,
|
|
index + driver->name_base);
|
|
}
|
|
|
|
/**
|
|
* tty_driver_lookup_tty() - find an existing tty, if any
|
|
* @driver: the driver for the tty
|
|
* @idx: the minor number
|
|
*
|
|
* Return the tty, if found. If not found, return NULL or ERR_PTR() if the
|
|
* driver lookup() method returns an error.
|
|
*
|
|
* Locking: tty_mutex must be held. If the tty is found, bump the tty kref.
|
|
*/
|
|
static struct tty_struct *tty_driver_lookup_tty(struct tty_driver *driver,
|
|
struct file *file, int idx)
|
|
{
|
|
struct tty_struct *tty;
|
|
|
|
if (driver->ops->lookup) {
|
|
if (!file)
|
|
tty = ERR_PTR(-EIO);
|
|
else
|
|
tty = driver->ops->lookup(driver, file, idx);
|
|
} else {
|
|
if (idx >= driver->num)
|
|
return ERR_PTR(-EINVAL);
|
|
tty = driver->ttys[idx];
|
|
}
|
|
if (!IS_ERR(tty))
|
|
tty_kref_get(tty);
|
|
return tty;
|
|
}
|
|
|
|
/**
|
|
* tty_init_termios - helper for termios setup
|
|
* @tty: the tty to set up
|
|
*
|
|
* Initialise the termios structures for this tty. Thus runs under
|
|
* the tty_mutex currently so we can be relaxed about ordering.
|
|
*/
|
|
|
|
void tty_init_termios(struct tty_struct *tty)
|
|
{
|
|
struct ktermios *tp;
|
|
int idx = tty->index;
|
|
|
|
if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS)
|
|
tty->termios = tty->driver->init_termios;
|
|
else {
|
|
/* Check for lazy saved data */
|
|
tp = tty->driver->termios[idx];
|
|
if (tp != NULL) {
|
|
tty->termios = *tp;
|
|
tty->termios.c_line = tty->driver->init_termios.c_line;
|
|
} else
|
|
tty->termios = tty->driver->init_termios;
|
|
}
|
|
/* Compatibility until drivers always set this */
|
|
tty->termios.c_ispeed = tty_termios_input_baud_rate(&tty->termios);
|
|
tty->termios.c_ospeed = tty_termios_baud_rate(&tty->termios);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_init_termios);
|
|
|
|
int tty_standard_install(struct tty_driver *driver, struct tty_struct *tty)
|
|
{
|
|
tty_init_termios(tty);
|
|
tty_driver_kref_get(driver);
|
|
tty->count++;
|
|
driver->ttys[tty->index] = tty;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_standard_install);
|
|
|
|
/**
|
|
* tty_driver_install_tty() - install a tty entry in the driver
|
|
* @driver: the driver for the tty
|
|
* @tty: the tty
|
|
*
|
|
* Install a tty object into the driver tables. The tty->index field
|
|
* will be set by the time this is called. This method is responsible
|
|
* for ensuring any need additional structures are allocated and
|
|
* configured.
|
|
*
|
|
* Locking: tty_mutex for now
|
|
*/
|
|
static int tty_driver_install_tty(struct tty_driver *driver,
|
|
struct tty_struct *tty)
|
|
{
|
|
return driver->ops->install ? driver->ops->install(driver, tty) :
|
|
tty_standard_install(driver, tty);
|
|
}
|
|
|
|
/**
|
|
* tty_driver_remove_tty() - remove a tty from the driver tables
|
|
* @driver: the driver for the tty
|
|
* @idx: the minor number
|
|
*
|
|
* Remvoe a tty object from the driver tables. The tty->index field
|
|
* will be set by the time this is called.
|
|
*
|
|
* Locking: tty_mutex for now
|
|
*/
|
|
static void tty_driver_remove_tty(struct tty_driver *driver, struct tty_struct *tty)
|
|
{
|
|
if (driver->ops->remove)
|
|
driver->ops->remove(driver, tty);
|
|
else
|
|
driver->ttys[tty->index] = NULL;
|
|
}
|
|
|
|
/*
|
|
* tty_reopen() - fast re-open of an open tty
|
|
* @tty - the tty to open
|
|
*
|
|
* Return 0 on success, -errno on error.
|
|
* Re-opens on master ptys are not allowed and return -EIO.
|
|
*
|
|
* Locking: Caller must hold tty_lock
|
|
*/
|
|
static int tty_reopen(struct tty_struct *tty)
|
|
{
|
|
struct tty_driver *driver = tty->driver;
|
|
struct tty_ldisc *ld;
|
|
int retval = 0;
|
|
|
|
if (driver->type == TTY_DRIVER_TYPE_PTY &&
|
|
driver->subtype == PTY_TYPE_MASTER)
|
|
return -EIO;
|
|
|
|
if (!tty->count)
|
|
return -EAGAIN;
|
|
|
|
if (test_bit(TTY_EXCLUSIVE, &tty->flags) && !capable(CAP_SYS_ADMIN))
|
|
return -EBUSY;
|
|
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (ld) {
|
|
tty_ldisc_deref(ld);
|
|
} else {
|
|
retval = tty_ldisc_lock(tty, 5 * HZ);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!tty->ldisc)
|
|
retval = tty_ldisc_reinit(tty, tty->termios.c_line);
|
|
tty_ldisc_unlock(tty);
|
|
}
|
|
|
|
if (retval == 0)
|
|
tty->count++;
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* tty_init_dev - initialise a tty device
|
|
* @driver: tty driver we are opening a device on
|
|
* @idx: device index
|
|
* @ret_tty: returned tty structure
|
|
*
|
|
* Prepare a tty device. This may not be a "new" clean device but
|
|
* could also be an active device. The pty drivers require special
|
|
* handling because of this.
|
|
*
|
|
* Locking:
|
|
* The function is called under the tty_mutex, which
|
|
* protects us from the tty struct or driver itself going away.
|
|
*
|
|
* On exit the tty device has the line discipline attached and
|
|
* a reference count of 1. If a pair was created for pty/tty use
|
|
* and the other was a pty master then it too has a reference count of 1.
|
|
*
|
|
* WSH 06/09/97: Rewritten to remove races and properly clean up after a
|
|
* failed open. The new code protects the open with a mutex, so it's
|
|
* really quite straightforward. The mutex locking can probably be
|
|
* relaxed for the (most common) case of reopening a tty.
|
|
*/
|
|
|
|
struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx)
|
|
{
|
|
struct tty_struct *tty;
|
|
int retval;
|
|
|
|
/*
|
|
* First time open is complex, especially for PTY devices.
|
|
* This code guarantees that either everything succeeds and the
|
|
* TTY is ready for operation, or else the table slots are vacated
|
|
* and the allocated memory released. (Except that the termios
|
|
* may be retained.)
|
|
*/
|
|
|
|
if (!try_module_get(driver->owner))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
tty = alloc_tty_struct(driver, idx);
|
|
if (!tty) {
|
|
retval = -ENOMEM;
|
|
goto err_module_put;
|
|
}
|
|
|
|
tty_lock(tty);
|
|
retval = tty_driver_install_tty(driver, tty);
|
|
if (retval < 0)
|
|
goto err_free_tty;
|
|
|
|
if (!tty->port)
|
|
tty->port = driver->ports[idx];
|
|
|
|
WARN_RATELIMIT(!tty->port,
|
|
"%s: %s driver does not set tty->port. This will crash the kernel later. Fix the driver!\n",
|
|
__func__, tty->driver->name);
|
|
|
|
retval = tty_ldisc_lock(tty, 5 * HZ);
|
|
if (retval)
|
|
goto err_release_lock;
|
|
tty->port->itty = tty;
|
|
|
|
/*
|
|
* Structures all installed ... call the ldisc open routines.
|
|
* If we fail here just call release_tty to clean up. No need
|
|
* to decrement the use counts, as release_tty doesn't care.
|
|
*/
|
|
retval = tty_ldisc_setup(tty, tty->link);
|
|
if (retval)
|
|
goto err_release_tty;
|
|
tty_ldisc_unlock(tty);
|
|
/* Return the tty locked so that it cannot vanish under the caller */
|
|
return tty;
|
|
|
|
err_free_tty:
|
|
tty_unlock(tty);
|
|
free_tty_struct(tty);
|
|
err_module_put:
|
|
module_put(driver->owner);
|
|
return ERR_PTR(retval);
|
|
|
|
/* call the tty release_tty routine to clean out this slot */
|
|
err_release_tty:
|
|
tty_ldisc_unlock(tty);
|
|
tty_info_ratelimited(tty, "ldisc open failed (%d), clearing slot %d\n",
|
|
retval, idx);
|
|
err_release_lock:
|
|
tty_unlock(tty);
|
|
release_tty(tty, idx);
|
|
return ERR_PTR(retval);
|
|
}
|
|
|
|
/**
|
|
* tty_save_termios() - save tty termios data in driver table
|
|
* @tty: tty whose termios data to save
|
|
*
|
|
* Locking: Caller guarantees serialisation with tty_init_termios().
|
|
*/
|
|
void tty_save_termios(struct tty_struct *tty)
|
|
{
|
|
struct ktermios *tp;
|
|
int idx = tty->index;
|
|
|
|
/* If the port is going to reset then it has no termios to save */
|
|
if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS)
|
|
return;
|
|
|
|
/* Stash the termios data */
|
|
tp = tty->driver->termios[idx];
|
|
if (tp == NULL) {
|
|
tp = kmalloc(sizeof(struct ktermios), GFP_KERNEL);
|
|
if (tp == NULL)
|
|
return;
|
|
tty->driver->termios[idx] = tp;
|
|
}
|
|
*tp = tty->termios;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_save_termios);
|
|
|
|
/**
|
|
* tty_flush_works - flush all works of a tty/pty pair
|
|
* @tty: tty device to flush works for (or either end of a pty pair)
|
|
*
|
|
* Sync flush all works belonging to @tty (and the 'other' tty).
|
|
*/
|
|
static void tty_flush_works(struct tty_struct *tty)
|
|
{
|
|
flush_work(&tty->SAK_work);
|
|
flush_work(&tty->hangup_work);
|
|
if (tty->link) {
|
|
flush_work(&tty->link->SAK_work);
|
|
flush_work(&tty->link->hangup_work);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* release_one_tty - release tty structure memory
|
|
* @kref: kref of tty we are obliterating
|
|
*
|
|
* Releases memory associated with a tty structure, and clears out the
|
|
* driver table slots. This function is called when a device is no longer
|
|
* in use. It also gets called when setup of a device fails.
|
|
*
|
|
* Locking:
|
|
* takes the file list lock internally when working on the list
|
|
* of ttys that the driver keeps.
|
|
*
|
|
* This method gets called from a work queue so that the driver private
|
|
* cleanup ops can sleep (needed for USB at least)
|
|
*/
|
|
static void release_one_tty(struct work_struct *work)
|
|
{
|
|
struct tty_struct *tty =
|
|
container_of(work, struct tty_struct, hangup_work);
|
|
struct tty_driver *driver = tty->driver;
|
|
struct module *owner = driver->owner;
|
|
|
|
if (tty->ops->cleanup)
|
|
tty->ops->cleanup(tty);
|
|
|
|
tty->magic = 0;
|
|
tty_driver_kref_put(driver);
|
|
module_put(owner);
|
|
|
|
spin_lock(&tty->files_lock);
|
|
list_del_init(&tty->tty_files);
|
|
spin_unlock(&tty->files_lock);
|
|
|
|
put_pid(tty->pgrp);
|
|
put_pid(tty->session);
|
|
#if defined(CONFIG_TTY_FLUSH_LOCAL_ECHO)
|
|
if (tty->echo_delayed_work.work.func)
|
|
cancel_delayed_work_sync(&tty->echo_delayed_work);
|
|
#endif
|
|
free_tty_struct(tty);
|
|
}
|
|
|
|
static void queue_release_one_tty(struct kref *kref)
|
|
{
|
|
struct tty_struct *tty = container_of(kref, struct tty_struct, kref);
|
|
|
|
/* The hangup queue is now free so we can reuse it rather than
|
|
waste a chunk of memory for each port */
|
|
INIT_WORK(&tty->hangup_work, release_one_tty);
|
|
schedule_work(&tty->hangup_work);
|
|
}
|
|
|
|
/**
|
|
* tty_kref_put - release a tty kref
|
|
* @tty: tty device
|
|
*
|
|
* Release a reference to a tty device and if need be let the kref
|
|
* layer destruct the object for us
|
|
*/
|
|
|
|
void tty_kref_put(struct tty_struct *tty)
|
|
{
|
|
if (tty)
|
|
kref_put(&tty->kref, queue_release_one_tty);
|
|
}
|
|
EXPORT_SYMBOL(tty_kref_put);
|
|
|
|
/**
|
|
* release_tty - release tty structure memory
|
|
*
|
|
* Release both @tty and a possible linked partner (think pty pair),
|
|
* and decrement the refcount of the backing module.
|
|
*
|
|
* Locking:
|
|
* tty_mutex
|
|
* takes the file list lock internally when working on the list
|
|
* of ttys that the driver keeps.
|
|
*
|
|
*/
|
|
static void release_tty(struct tty_struct *tty, int idx)
|
|
{
|
|
/* This should always be true but check for the moment */
|
|
WARN_ON(tty->index != idx);
|
|
WARN_ON(!mutex_is_locked(&tty_mutex));
|
|
if (tty->ops->shutdown)
|
|
tty->ops->shutdown(tty);
|
|
tty_save_termios(tty);
|
|
tty_driver_remove_tty(tty->driver, tty);
|
|
tty->port->itty = NULL;
|
|
if (tty->link)
|
|
tty->link->port->itty = NULL;
|
|
tty_buffer_cancel_work(tty->port);
|
|
if (tty->link)
|
|
tty_buffer_cancel_work(tty->link->port);
|
|
|
|
tty_kref_put(tty->link);
|
|
tty_kref_put(tty);
|
|
}
|
|
|
|
/**
|
|
* tty_release_checks - check a tty before real release
|
|
* @tty: tty to check
|
|
* @o_tty: link of @tty (if any)
|
|
* @idx: index of the tty
|
|
*
|
|
* Performs some paranoid checking before true release of the @tty.
|
|
* This is a no-op unless TTY_PARANOIA_CHECK is defined.
|
|
*/
|
|
static int tty_release_checks(struct tty_struct *tty, int idx)
|
|
{
|
|
#ifdef TTY_PARANOIA_CHECK
|
|
if (idx < 0 || idx >= tty->driver->num) {
|
|
tty_debug(tty, "bad idx %d\n", idx);
|
|
return -1;
|
|
}
|
|
|
|
/* not much to check for devpts */
|
|
if (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)
|
|
return 0;
|
|
|
|
if (tty != tty->driver->ttys[idx]) {
|
|
tty_debug(tty, "bad driver table[%d] = %p\n",
|
|
idx, tty->driver->ttys[idx]);
|
|
return -1;
|
|
}
|
|
if (tty->driver->other) {
|
|
struct tty_struct *o_tty = tty->link;
|
|
|
|
if (o_tty != tty->driver->other->ttys[idx]) {
|
|
tty_debug(tty, "bad other table[%d] = %p\n",
|
|
idx, tty->driver->other->ttys[idx]);
|
|
return -1;
|
|
}
|
|
if (o_tty->link != tty) {
|
|
tty_debug(tty, "bad link = %p\n", o_tty->link);
|
|
return -1;
|
|
}
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tty_kclose - closes tty opened by tty_kopen
|
|
* @tty: tty device
|
|
*
|
|
* Performs the final steps to release and free a tty device. It is the
|
|
* same as tty_release_struct except that it also resets TTY_PORT_KOPENED
|
|
* flag on tty->port.
|
|
*/
|
|
void tty_kclose(struct tty_struct *tty)
|
|
{
|
|
/*
|
|
* Ask the line discipline code to release its structures
|
|
*/
|
|
tty_ldisc_release(tty);
|
|
|
|
/* Wait for pending work before tty destruction commmences */
|
|
tty_flush_works(tty);
|
|
|
|
tty_debug_hangup(tty, "freeing structure\n");
|
|
/*
|
|
* The release_tty function takes care of the details of clearing
|
|
* the slots and preserving the termios structure. The tty_unlock_pair
|
|
* should be safe as we keep a kref while the tty is locked (so the
|
|
* unlock never unlocks a freed tty).
|
|
*/
|
|
mutex_lock(&tty_mutex);
|
|
tty_port_set_kopened(tty->port, 0);
|
|
release_tty(tty, tty->index);
|
|
mutex_unlock(&tty_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_kclose);
|
|
|
|
/**
|
|
* tty_release_struct - release a tty struct
|
|
* @tty: tty device
|
|
* @idx: index of the tty
|
|
*
|
|
* Performs the final steps to release and free a tty device. It is
|
|
* roughly the reverse of tty_init_dev.
|
|
*/
|
|
void tty_release_struct(struct tty_struct *tty, int idx)
|
|
{
|
|
/*
|
|
* Ask the line discipline code to release its structures
|
|
*/
|
|
tty_ldisc_release(tty);
|
|
|
|
/* Wait for pending work before tty destruction commmences */
|
|
tty_flush_works(tty);
|
|
|
|
tty_debug_hangup(tty, "freeing structure\n");
|
|
/*
|
|
* The release_tty function takes care of the details of clearing
|
|
* the slots and preserving the termios structure. The tty_unlock_pair
|
|
* should be safe as we keep a kref while the tty is locked (so the
|
|
* unlock never unlocks a freed tty).
|
|
*/
|
|
mutex_lock(&tty_mutex);
|
|
release_tty(tty, idx);
|
|
mutex_unlock(&tty_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_release_struct);
|
|
|
|
/**
|
|
* tty_release - vfs callback for close
|
|
* @inode: inode of tty
|
|
* @filp: file pointer for handle to tty
|
|
*
|
|
* Called the last time each file handle is closed that references
|
|
* this tty. There may however be several such references.
|
|
*
|
|
* Locking:
|
|
* Takes bkl. See tty_release_dev
|
|
*
|
|
* Even releasing the tty structures is a tricky business.. We have
|
|
* to be very careful that the structures are all released at the
|
|
* same time, as interrupts might otherwise get the wrong pointers.
|
|
*
|
|
* WSH 09/09/97: rewritten to avoid some nasty race conditions that could
|
|
* lead to double frees or releasing memory still in use.
|
|
*/
|
|
|
|
int tty_release(struct inode *inode, struct file *filp)
|
|
{
|
|
struct tty_struct *tty = file_tty(filp);
|
|
struct tty_struct *o_tty = NULL;
|
|
int do_sleep, final;
|
|
int idx;
|
|
long timeout = 0;
|
|
int once = 1;
|
|
|
|
if (tty_paranoia_check(tty, inode, __func__))
|
|
return 0;
|
|
|
|
tty_lock(tty);
|
|
check_tty_count(tty, __func__);
|
|
|
|
__tty_fasync(-1, filp, 0);
|
|
|
|
idx = tty->index;
|
|
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
|
tty->driver->subtype == PTY_TYPE_MASTER)
|
|
o_tty = tty->link;
|
|
|
|
if (tty_release_checks(tty, idx)) {
|
|
tty_unlock(tty);
|
|
return 0;
|
|
}
|
|
|
|
tty_debug_hangup(tty, "releasing (count=%d)\n", tty->count);
|
|
|
|
if (tty->ops->close)
|
|
tty->ops->close(tty, filp);
|
|
|
|
/* If tty is pty master, lock the slave pty (stable lock order) */
|
|
tty_lock_slave(o_tty);
|
|
|
|
/*
|
|
* Sanity check: if tty->count is going to zero, there shouldn't be
|
|
* any waiters on tty->read_wait or tty->write_wait. We test the
|
|
* wait queues and kick everyone out _before_ actually starting to
|
|
* close. This ensures that we won't block while releasing the tty
|
|
* structure.
|
|
*
|
|
* The test for the o_tty closing is necessary, since the master and
|
|
* slave sides may close in any order. If the slave side closes out
|
|
* first, its count will be one, since the master side holds an open.
|
|
* Thus this test wouldn't be triggered at the time the slave closed,
|
|
* so we do it now.
|
|
*/
|
|
while (1) {
|
|
do_sleep = 0;
|
|
|
|
if (tty->count <= 1) {
|
|
if (waitqueue_active(&tty->read_wait)) {
|
|
wake_up_poll(&tty->read_wait, EPOLLIN);
|
|
do_sleep++;
|
|
}
|
|
if (waitqueue_active(&tty->write_wait)) {
|
|
wake_up_poll(&tty->write_wait, EPOLLOUT);
|
|
do_sleep++;
|
|
}
|
|
}
|
|
if (o_tty && o_tty->count <= 1) {
|
|
if (waitqueue_active(&o_tty->read_wait)) {
|
|
wake_up_poll(&o_tty->read_wait, EPOLLIN);
|
|
do_sleep++;
|
|
}
|
|
if (waitqueue_active(&o_tty->write_wait)) {
|
|
wake_up_poll(&o_tty->write_wait, EPOLLOUT);
|
|
do_sleep++;
|
|
}
|
|
}
|
|
if (!do_sleep)
|
|
break;
|
|
|
|
if (once) {
|
|
once = 0;
|
|
tty_warn(tty, "read/write wait queue active!\n");
|
|
}
|
|
schedule_timeout_killable(timeout);
|
|
if (timeout < 120 * HZ)
|
|
timeout = 2 * timeout + 1;
|
|
else
|
|
timeout = MAX_SCHEDULE_TIMEOUT;
|
|
}
|
|
|
|
if (o_tty) {
|
|
if (--o_tty->count < 0) {
|
|
tty_warn(tty, "bad slave count (%d)\n", o_tty->count);
|
|
o_tty->count = 0;
|
|
}
|
|
}
|
|
if (--tty->count < 0) {
|
|
tty_warn(tty, "bad tty->count (%d)\n", tty->count);
|
|
tty->count = 0;
|
|
}
|
|
|
|
/*
|
|
* We've decremented tty->count, so we need to remove this file
|
|
* descriptor off the tty->tty_files list; this serves two
|
|
* purposes:
|
|
* - check_tty_count sees the correct number of file descriptors
|
|
* associated with this tty.
|
|
* - do_tty_hangup no longer sees this file descriptor as
|
|
* something that needs to be handled for hangups.
|
|
*/
|
|
tty_del_file(filp);
|
|
|
|
/*
|
|
* Perform some housekeeping before deciding whether to return.
|
|
*
|
|
* If _either_ side is closing, make sure there aren't any
|
|
* processes that still think tty or o_tty is their controlling
|
|
* tty.
|
|
*/
|
|
if (!tty->count) {
|
|
read_lock(&tasklist_lock);
|
|
session_clear_tty(tty->session);
|
|
if (o_tty)
|
|
session_clear_tty(o_tty->session);
|
|
read_unlock(&tasklist_lock);
|
|
}
|
|
|
|
/* check whether both sides are closing ... */
|
|
final = !tty->count && !(o_tty && o_tty->count);
|
|
|
|
tty_unlock_slave(o_tty);
|
|
tty_unlock(tty);
|
|
|
|
/* At this point, the tty->count == 0 should ensure a dead tty
|
|
cannot be re-opened by a racing opener */
|
|
|
|
if (!final)
|
|
return 0;
|
|
|
|
tty_debug_hangup(tty, "final close\n");
|
|
|
|
tty_release_struct(tty, idx);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tty_open_current_tty - get locked tty of current task
|
|
* @device: device number
|
|
* @filp: file pointer to tty
|
|
* @return: locked tty of the current task iff @device is /dev/tty
|
|
*
|
|
* Performs a re-open of the current task's controlling tty.
|
|
*
|
|
* We cannot return driver and index like for the other nodes because
|
|
* devpts will not work then. It expects inodes to be from devpts FS.
|
|
*/
|
|
static struct tty_struct *tty_open_current_tty(dev_t device, struct file *filp)
|
|
{
|
|
struct tty_struct *tty;
|
|
int retval;
|
|
|
|
if (device != MKDEV(TTYAUX_MAJOR, 0))
|
|
return NULL;
|
|
|
|
tty = get_current_tty();
|
|
if (!tty)
|
|
return ERR_PTR(-ENXIO);
|
|
|
|
filp->f_flags |= O_NONBLOCK; /* Don't let /dev/tty block */
|
|
/* noctty = 1; */
|
|
tty_lock(tty);
|
|
tty_kref_put(tty); /* safe to drop the kref now */
|
|
|
|
retval = tty_reopen(tty);
|
|
if (retval < 0) {
|
|
tty_unlock(tty);
|
|
tty = ERR_PTR(retval);
|
|
}
|
|
return tty;
|
|
}
|
|
|
|
/**
|
|
* tty_lookup_driver - lookup a tty driver for a given device file
|
|
* @device: device number
|
|
* @filp: file pointer to tty
|
|
* @index: index for the device in the @return driver
|
|
* @return: driver for this inode (with increased refcount)
|
|
*
|
|
* If @return is not erroneous, the caller is responsible to decrement the
|
|
* refcount by tty_driver_kref_put.
|
|
*
|
|
* Locking: tty_mutex protects get_tty_driver
|
|
*/
|
|
static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp,
|
|
int *index)
|
|
{
|
|
struct tty_driver *driver;
|
|
|
|
switch (device) {
|
|
#ifdef CONFIG_VT
|
|
case MKDEV(TTY_MAJOR, 0): {
|
|
extern struct tty_driver *console_driver;
|
|
driver = tty_driver_kref_get(console_driver);
|
|
*index = fg_console;
|
|
break;
|
|
}
|
|
#endif
|
|
case MKDEV(TTYAUX_MAJOR, 1): {
|
|
struct tty_driver *console_driver = console_device(index);
|
|
if (console_driver) {
|
|
driver = tty_driver_kref_get(console_driver);
|
|
if (driver && filp) {
|
|
/* Don't let /dev/console block */
|
|
filp->f_flags |= O_NONBLOCK;
|
|
break;
|
|
}
|
|
}
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
default:
|
|
driver = get_tty_driver(device, index);
|
|
if (!driver)
|
|
return ERR_PTR(-ENODEV);
|
|
break;
|
|
}
|
|
return driver;
|
|
}
|
|
|
|
/**
|
|
* tty_kopen - open a tty device for kernel
|
|
* @device: dev_t of device to open
|
|
*
|
|
* Opens tty exclusively for kernel. Performs the driver lookup,
|
|
* makes sure it's not already opened and performs the first-time
|
|
* tty initialization.
|
|
*
|
|
* Returns the locked initialized &tty_struct
|
|
*
|
|
* Claims the global tty_mutex to serialize:
|
|
* - concurrent first-time tty initialization
|
|
* - concurrent tty driver removal w/ lookup
|
|
* - concurrent tty removal from driver table
|
|
*/
|
|
struct tty_struct *tty_kopen(dev_t device)
|
|
{
|
|
struct tty_struct *tty;
|
|
struct tty_driver *driver = NULL;
|
|
int index = -1;
|
|
|
|
mutex_lock(&tty_mutex);
|
|
driver = tty_lookup_driver(device, NULL, &index);
|
|
if (IS_ERR(driver)) {
|
|
mutex_unlock(&tty_mutex);
|
|
return ERR_CAST(driver);
|
|
}
|
|
|
|
/* check whether we're reopening an existing tty */
|
|
tty = tty_driver_lookup_tty(driver, NULL, index);
|
|
if (IS_ERR(tty))
|
|
goto out;
|
|
|
|
if (tty) {
|
|
/* drop kref from tty_driver_lookup_tty() */
|
|
tty_kref_put(tty);
|
|
tty = ERR_PTR(-EBUSY);
|
|
} else { /* tty_init_dev returns tty with the tty_lock held */
|
|
tty = tty_init_dev(driver, index);
|
|
if (IS_ERR(tty))
|
|
goto out;
|
|
tty_port_set_kopened(tty->port, 1);
|
|
}
|
|
out:
|
|
mutex_unlock(&tty_mutex);
|
|
tty_driver_kref_put(driver);
|
|
return tty;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_kopen);
|
|
|
|
/**
|
|
* tty_open_by_driver - open a tty device
|
|
* @device: dev_t of device to open
|
|
* @inode: inode of device file
|
|
* @filp: file pointer to tty
|
|
*
|
|
* Performs the driver lookup, checks for a reopen, or otherwise
|
|
* performs the first-time tty initialization.
|
|
*
|
|
* Returns the locked initialized or re-opened &tty_struct
|
|
*
|
|
* Claims the global tty_mutex to serialize:
|
|
* - concurrent first-time tty initialization
|
|
* - concurrent tty driver removal w/ lookup
|
|
* - concurrent tty removal from driver table
|
|
*/
|
|
static struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode,
|
|
struct file *filp)
|
|
{
|
|
struct tty_struct *tty;
|
|
struct tty_driver *driver = NULL;
|
|
int index = -1;
|
|
int retval;
|
|
|
|
mutex_lock(&tty_mutex);
|
|
driver = tty_lookup_driver(device, filp, &index);
|
|
if (IS_ERR(driver)) {
|
|
mutex_unlock(&tty_mutex);
|
|
return ERR_CAST(driver);
|
|
}
|
|
|
|
/* check whether we're reopening an existing tty */
|
|
tty = tty_driver_lookup_tty(driver, filp, index);
|
|
if (IS_ERR(tty)) {
|
|
mutex_unlock(&tty_mutex);
|
|
goto out;
|
|
}
|
|
|
|
if (tty) {
|
|
if (tty_port_kopened(tty->port)) {
|
|
tty_kref_put(tty);
|
|
mutex_unlock(&tty_mutex);
|
|
tty = ERR_PTR(-EBUSY);
|
|
goto out;
|
|
}
|
|
mutex_unlock(&tty_mutex);
|
|
retval = tty_lock_interruptible(tty);
|
|
tty_kref_put(tty); /* drop kref from tty_driver_lookup_tty() */
|
|
if (retval) {
|
|
if (retval == -EINTR)
|
|
retval = -ERESTARTSYS;
|
|
tty = ERR_PTR(retval);
|
|
goto out;
|
|
}
|
|
retval = tty_reopen(tty);
|
|
if (retval < 0) {
|
|
tty_unlock(tty);
|
|
tty = ERR_PTR(retval);
|
|
}
|
|
} else { /* Returns with the tty_lock held for now */
|
|
tty = tty_init_dev(driver, index);
|
|
mutex_unlock(&tty_mutex);
|
|
}
|
|
out:
|
|
tty_driver_kref_put(driver);
|
|
return tty;
|
|
}
|
|
|
|
/**
|
|
* tty_open - open a tty device
|
|
* @inode: inode of device file
|
|
* @filp: file pointer to tty
|
|
*
|
|
* tty_open and tty_release keep up the tty count that contains the
|
|
* number of opens done on a tty. We cannot use the inode-count, as
|
|
* different inodes might point to the same tty.
|
|
*
|
|
* Open-counting is needed for pty masters, as well as for keeping
|
|
* track of serial lines: DTR is dropped when the last close happens.
|
|
* (This is not done solely through tty->count, now. - Ted 1/27/92)
|
|
*
|
|
* The termios state of a pty is reset on first open so that
|
|
* settings don't persist across reuse.
|
|
*
|
|
* Locking: tty_mutex protects tty, tty_lookup_driver and tty_init_dev.
|
|
* tty->count should protect the rest.
|
|
* ->siglock protects ->signal/->sighand
|
|
*
|
|
* Note: the tty_unlock/lock cases without a ref are only safe due to
|
|
* tty_mutex
|
|
*/
|
|
|
|
static int tty_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct tty_struct *tty;
|
|
int noctty, retval;
|
|
dev_t device = inode->i_rdev;
|
|
unsigned saved_flags = filp->f_flags;
|
|
|
|
nonseekable_open(inode, filp);
|
|
|
|
retry_open:
|
|
retval = tty_alloc_file(filp);
|
|
if (retval)
|
|
return -ENOMEM;
|
|
|
|
tty = tty_open_current_tty(device, filp);
|
|
if (!tty)
|
|
tty = tty_open_by_driver(device, inode, filp);
|
|
|
|
if (IS_ERR(tty)) {
|
|
tty_free_file(filp);
|
|
retval = PTR_ERR(tty);
|
|
if (retval != -EAGAIN || signal_pending(current))
|
|
return retval;
|
|
schedule();
|
|
goto retry_open;
|
|
}
|
|
|
|
tty_add_file(tty, filp);
|
|
|
|
check_tty_count(tty, __func__);
|
|
tty_debug_hangup(tty, "opening (count=%d)\n", tty->count);
|
|
|
|
if (tty->ops->open)
|
|
retval = tty->ops->open(tty, filp);
|
|
else
|
|
retval = -ENODEV;
|
|
filp->f_flags = saved_flags;
|
|
|
|
if (retval) {
|
|
tty_debug_hangup(tty, "open error %d, releasing\n", retval);
|
|
|
|
tty_unlock(tty); /* need to call tty_release without BTM */
|
|
tty_release(inode, filp);
|
|
if (retval != -ERESTARTSYS)
|
|
return retval;
|
|
|
|
if (signal_pending(current))
|
|
return retval;
|
|
|
|
schedule();
|
|
/*
|
|
* Need to reset f_op in case a hangup happened.
|
|
*/
|
|
if (tty_hung_up_p(filp))
|
|
filp->f_op = &tty_fops;
|
|
goto retry_open;
|
|
}
|
|
clear_bit(TTY_HUPPED, &tty->flags);
|
|
|
|
noctty = (filp->f_flags & O_NOCTTY) ||
|
|
(IS_ENABLED(CONFIG_VT) && device == MKDEV(TTY_MAJOR, 0)) ||
|
|
device == MKDEV(TTYAUX_MAJOR, 1) ||
|
|
(tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
|
tty->driver->subtype == PTY_TYPE_MASTER);
|
|
if (!noctty)
|
|
tty_open_proc_set_tty(filp, tty);
|
|
tty_unlock(tty);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* tty_poll - check tty status
|
|
* @filp: file being polled
|
|
* @wait: poll wait structures to update
|
|
*
|
|
* Call the line discipline polling method to obtain the poll
|
|
* status of the device.
|
|
*
|
|
* Locking: locks called line discipline but ldisc poll method
|
|
* may be re-entered freely by other callers.
|
|
*/
|
|
|
|
static __poll_t tty_poll(struct file *filp, poll_table *wait)
|
|
{
|
|
struct tty_struct *tty = file_tty(filp);
|
|
struct tty_ldisc *ld;
|
|
__poll_t ret = 0;
|
|
|
|
if (tty_paranoia_check(tty, file_inode(filp), "tty_poll"))
|
|
return 0;
|
|
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return hung_up_tty_poll(filp, wait);
|
|
if (ld->ops->poll)
|
|
ret = ld->ops->poll(tty, filp, wait);
|
|
tty_ldisc_deref(ld);
|
|
return ret;
|
|
}
|
|
|
|
static int __tty_fasync(int fd, struct file *filp, int on)
|
|
{
|
|
struct tty_struct *tty = file_tty(filp);
|
|
unsigned long flags;
|
|
int retval = 0;
|
|
|
|
if (tty_paranoia_check(tty, file_inode(filp), "tty_fasync"))
|
|
goto out;
|
|
|
|
retval = fasync_helper(fd, filp, on, &tty->fasync);
|
|
if (retval <= 0)
|
|
goto out;
|
|
|
|
if (on) {
|
|
enum pid_type type;
|
|
struct pid *pid;
|
|
|
|
spin_lock_irqsave(&tty->ctrl_lock, flags);
|
|
if (tty->pgrp) {
|
|
pid = tty->pgrp;
|
|
type = PIDTYPE_PGID;
|
|
} else {
|
|
pid = task_pid(current);
|
|
type = PIDTYPE_TGID;
|
|
}
|
|
get_pid(pid);
|
|
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
|
|
__f_setown(filp, pid, type, 0);
|
|
put_pid(pid);
|
|
retval = 0;
|
|
}
|
|
out:
|
|
return retval;
|
|
}
|
|
|
|
static int tty_fasync(int fd, struct file *filp, int on)
|
|
{
|
|
struct tty_struct *tty = file_tty(filp);
|
|
int retval = -ENOTTY;
|
|
|
|
tty_lock(tty);
|
|
if (!tty_hung_up_p(filp))
|
|
retval = __tty_fasync(fd, filp, on);
|
|
tty_unlock(tty);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* tiocsti - fake input character
|
|
* @tty: tty to fake input into
|
|
* @p: pointer to character
|
|
*
|
|
* Fake input to a tty device. Does the necessary locking and
|
|
* input management.
|
|
*
|
|
* FIXME: does not honour flow control ??
|
|
*
|
|
* Locking:
|
|
* Called functions take tty_ldiscs_lock
|
|
* current->signal->tty check is safe without locks
|
|
*/
|
|
|
|
static int tiocsti(struct tty_struct *tty, char __user *p)
|
|
{
|
|
char ch, mbz = 0;
|
|
struct tty_ldisc *ld;
|
|
|
|
if ((current->signal->tty != tty) && !capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (get_user(ch, p))
|
|
return -EFAULT;
|
|
tty_audit_tiocsti(tty, ch);
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return -EIO;
|
|
tty_buffer_lock_exclusive(tty->port);
|
|
if (ld->ops->receive_buf)
|
|
ld->ops->receive_buf(tty, &ch, &mbz, 1);
|
|
tty_buffer_unlock_exclusive(tty->port);
|
|
tty_ldisc_deref(ld);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tiocgwinsz - implement window query ioctl
|
|
* @tty; tty
|
|
* @arg: user buffer for result
|
|
*
|
|
* Copies the kernel idea of the window size into the user buffer.
|
|
*
|
|
* Locking: tty->winsize_mutex is taken to ensure the winsize data
|
|
* is consistent.
|
|
*/
|
|
|
|
static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg)
|
|
{
|
|
int err;
|
|
|
|
mutex_lock(&tty->winsize_mutex);
|
|
err = copy_to_user(arg, &tty->winsize, sizeof(*arg));
|
|
mutex_unlock(&tty->winsize_mutex);
|
|
|
|
return err ? -EFAULT: 0;
|
|
}
|
|
|
|
/**
|
|
* tty_do_resize - resize event
|
|
* @tty: tty being resized
|
|
* @rows: rows (character)
|
|
* @cols: cols (character)
|
|
*
|
|
* Update the termios variables and send the necessary signals to
|
|
* peform a terminal resize correctly
|
|
*/
|
|
|
|
int tty_do_resize(struct tty_struct *tty, struct winsize *ws)
|
|
{
|
|
struct pid *pgrp;
|
|
|
|
/* Lock the tty */
|
|
mutex_lock(&tty->winsize_mutex);
|
|
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
|
|
goto done;
|
|
|
|
/* Signal the foreground process group */
|
|
pgrp = tty_get_pgrp(tty);
|
|
if (pgrp)
|
|
kill_pgrp(pgrp, SIGWINCH, 1);
|
|
put_pid(pgrp);
|
|
|
|
tty->winsize = *ws;
|
|
done:
|
|
mutex_unlock(&tty->winsize_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(tty_do_resize);
|
|
|
|
/**
|
|
* tiocswinsz - implement window size set ioctl
|
|
* @tty; tty side of tty
|
|
* @arg: user buffer for result
|
|
*
|
|
* Copies the user idea of the window size to the kernel. Traditionally
|
|
* this is just advisory information but for the Linux console it
|
|
* actually has driver level meaning and triggers a VC resize.
|
|
*
|
|
* Locking:
|
|
* Driver dependent. The default do_resize method takes the
|
|
* tty termios mutex and ctrl_lock. The console takes its own lock
|
|
* then calls into the default method.
|
|
*/
|
|
|
|
static int tiocswinsz(struct tty_struct *tty, struct winsize __user *arg)
|
|
{
|
|
struct winsize tmp_ws;
|
|
if (copy_from_user(&tmp_ws, arg, sizeof(*arg)))
|
|
return -EFAULT;
|
|
|
|
if (tty->ops->resize)
|
|
return tty->ops->resize(tty, &tmp_ws);
|
|
else
|
|
return tty_do_resize(tty, &tmp_ws);
|
|
}
|
|
|
|
/**
|
|
* tioccons - allow admin to move logical console
|
|
* @file: the file to become console
|
|
*
|
|
* Allow the administrator to move the redirected console device
|
|
*
|
|
* Locking: uses redirect_lock to guard the redirect information
|
|
*/
|
|
|
|
static int tioccons(struct file *file)
|
|
{
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
if (file->f_op->write == redirected_tty_write) {
|
|
struct file *f;
|
|
spin_lock(&redirect_lock);
|
|
f = redirect;
|
|
redirect = NULL;
|
|
spin_unlock(&redirect_lock);
|
|
if (f)
|
|
fput(f);
|
|
return 0;
|
|
}
|
|
spin_lock(&redirect_lock);
|
|
if (redirect) {
|
|
spin_unlock(&redirect_lock);
|
|
return -EBUSY;
|
|
}
|
|
redirect = get_file(file);
|
|
spin_unlock(&redirect_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fionbio - non blocking ioctl
|
|
* @file: file to set blocking value
|
|
* @p: user parameter
|
|
*
|
|
* Historical tty interfaces had a blocking control ioctl before
|
|
* the generic functionality existed. This piece of history is preserved
|
|
* in the expected tty API of posix OS's.
|
|
*
|
|
* Locking: none, the open file handle ensures it won't go away.
|
|
*/
|
|
|
|
static int fionbio(struct file *file, int __user *p)
|
|
{
|
|
int nonblock;
|
|
|
|
if (get_user(nonblock, p))
|
|
return -EFAULT;
|
|
|
|
spin_lock(&file->f_lock);
|
|
if (nonblock)
|
|
file->f_flags |= O_NONBLOCK;
|
|
else
|
|
file->f_flags &= ~O_NONBLOCK;
|
|
spin_unlock(&file->f_lock);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tiocsetd - set line discipline
|
|
* @tty: tty device
|
|
* @p: pointer to user data
|
|
*
|
|
* Set the line discipline according to user request.
|
|
*
|
|
* Locking: see tty_set_ldisc, this function is just a helper
|
|
*/
|
|
|
|
static int tiocsetd(struct tty_struct *tty, int __user *p)
|
|
{
|
|
int disc;
|
|
int ret;
|
|
|
|
if (get_user(disc, p))
|
|
return -EFAULT;
|
|
|
|
ret = tty_set_ldisc(tty, disc);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* tiocgetd - get line discipline
|
|
* @tty: tty device
|
|
* @p: pointer to user data
|
|
*
|
|
* Retrieves the line discipline id directly from the ldisc.
|
|
*
|
|
* Locking: waits for ldisc reference (in case the line discipline
|
|
* is changing or the tty is being hungup)
|
|
*/
|
|
|
|
static int tiocgetd(struct tty_struct *tty, int __user *p)
|
|
{
|
|
struct tty_ldisc *ld;
|
|
int ret;
|
|
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return -EIO;
|
|
ret = put_user(ld->ops->num, p);
|
|
tty_ldisc_deref(ld);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* send_break - performed time break
|
|
* @tty: device to break on
|
|
* @duration: timeout in mS
|
|
*
|
|
* Perform a timed break on hardware that lacks its own driver level
|
|
* timed break functionality.
|
|
*
|
|
* Locking:
|
|
* atomic_write_lock serializes
|
|
*
|
|
*/
|
|
|
|
static int send_break(struct tty_struct *tty, unsigned int duration)
|
|
{
|
|
int retval;
|
|
|
|
if (tty->ops->break_ctl == NULL)
|
|
return 0;
|
|
|
|
if (tty->driver->flags & TTY_DRIVER_HARDWARE_BREAK)
|
|
retval = tty->ops->break_ctl(tty, duration);
|
|
else {
|
|
/* Do the work ourselves */
|
|
if (tty_write_lock(tty, 0) < 0)
|
|
return -EINTR;
|
|
retval = tty->ops->break_ctl(tty, -1);
|
|
if (retval)
|
|
goto out;
|
|
if (!signal_pending(current))
|
|
msleep_interruptible(duration);
|
|
retval = tty->ops->break_ctl(tty, 0);
|
|
out:
|
|
tty_write_unlock(tty);
|
|
if (signal_pending(current))
|
|
retval = -EINTR;
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* tty_tiocmget - get modem status
|
|
* @tty: tty device
|
|
* @file: user file pointer
|
|
* @p: pointer to result
|
|
*
|
|
* Obtain the modem status bits from the tty driver if the feature
|
|
* is supported. Return -ENOTTY if it is not available.
|
|
*
|
|
* Locking: none (up to the driver)
|
|
*/
|
|
|
|
static int tty_tiocmget(struct tty_struct *tty, int __user *p)
|
|
{
|
|
int retval = -ENOTTY;
|
|
|
|
if (tty->ops->tiocmget) {
|
|
retval = tty->ops->tiocmget(tty);
|
|
|
|
if (retval >= 0)
|
|
retval = put_user(retval, p);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* tty_tiocmset - set modem status
|
|
* @tty: tty device
|
|
* @cmd: command - clear bits, set bits or set all
|
|
* @p: pointer to desired bits
|
|
*
|
|
* Set the modem status bits from the tty driver if the feature
|
|
* is supported. Return -ENOTTY if it is not available.
|
|
*
|
|
* Locking: none (up to the driver)
|
|
*/
|
|
|
|
static int tty_tiocmset(struct tty_struct *tty, unsigned int cmd,
|
|
unsigned __user *p)
|
|
{
|
|
int retval;
|
|
unsigned int set, clear, val;
|
|
|
|
if (tty->ops->tiocmset == NULL)
|
|
return -ENOTTY;
|
|
|
|
retval = get_user(val, p);
|
|
if (retval)
|
|
return retval;
|
|
set = clear = 0;
|
|
switch (cmd) {
|
|
case TIOCMBIS:
|
|
set = val;
|
|
break;
|
|
case TIOCMBIC:
|
|
clear = val;
|
|
break;
|
|
case TIOCMSET:
|
|
set = val;
|
|
clear = ~val;
|
|
break;
|
|
}
|
|
set &= TIOCM_DTR|TIOCM_RTS|TIOCM_OUT1|TIOCM_OUT2|TIOCM_LOOP;
|
|
clear &= TIOCM_DTR|TIOCM_RTS|TIOCM_OUT1|TIOCM_OUT2|TIOCM_LOOP;
|
|
return tty->ops->tiocmset(tty, set, clear);
|
|
}
|
|
|
|
static int tty_tiocgicount(struct tty_struct *tty, void __user *arg)
|
|
{
|
|
int retval = -EINVAL;
|
|
struct serial_icounter_struct icount;
|
|
memset(&icount, 0, sizeof(icount));
|
|
if (tty->ops->get_icount)
|
|
retval = tty->ops->get_icount(tty, &icount);
|
|
if (retval != 0)
|
|
return retval;
|
|
if (copy_to_user(arg, &icount, sizeof(icount)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static void tty_warn_deprecated_flags(struct serial_struct __user *ss)
|
|
{
|
|
static DEFINE_RATELIMIT_STATE(depr_flags,
|
|
DEFAULT_RATELIMIT_INTERVAL,
|
|
DEFAULT_RATELIMIT_BURST);
|
|
char comm[TASK_COMM_LEN];
|
|
int flags;
|
|
|
|
if (get_user(flags, &ss->flags))
|
|
return;
|
|
|
|
flags &= ASYNC_DEPRECATED;
|
|
|
|
if (flags && __ratelimit(&depr_flags))
|
|
pr_warn("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n",
|
|
__func__, get_task_comm(comm, current), flags);
|
|
}
|
|
|
|
/*
|
|
* if pty, return the slave side (real_tty)
|
|
* otherwise, return self
|
|
*/
|
|
static struct tty_struct *tty_pair_get_tty(struct tty_struct *tty)
|
|
{
|
|
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
|
tty->driver->subtype == PTY_TYPE_MASTER)
|
|
tty = tty->link;
|
|
return tty;
|
|
}
|
|
|
|
/*
|
|
* Split this up, as gcc can choke on it otherwise..
|
|
*/
|
|
long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tty_struct *tty = file_tty(file);
|
|
struct tty_struct *real_tty;
|
|
void __user *p = (void __user *)arg;
|
|
int retval;
|
|
struct tty_ldisc *ld;
|
|
|
|
if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl"))
|
|
return -EINVAL;
|
|
|
|
real_tty = tty_pair_get_tty(tty);
|
|
|
|
/*
|
|
* Factor out some common prep work
|
|
*/
|
|
switch (cmd) {
|
|
case TIOCSETD:
|
|
case TIOCSBRK:
|
|
case TIOCCBRK:
|
|
case TCSBRK:
|
|
case TCSBRKP:
|
|
retval = tty_check_change(tty);
|
|
if (retval)
|
|
return retval;
|
|
if (cmd != TIOCCBRK) {
|
|
tty_wait_until_sent(tty, 0);
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Now do the stuff.
|
|
*/
|
|
switch (cmd) {
|
|
case TIOCSTI:
|
|
return tiocsti(tty, p);
|
|
case TIOCGWINSZ:
|
|
return tiocgwinsz(real_tty, p);
|
|
case TIOCSWINSZ:
|
|
return tiocswinsz(real_tty, p);
|
|
case TIOCCONS:
|
|
return real_tty != tty ? -EINVAL : tioccons(file);
|
|
case FIONBIO:
|
|
return fionbio(file, p);
|
|
case TIOCEXCL:
|
|
set_bit(TTY_EXCLUSIVE, &tty->flags);
|
|
return 0;
|
|
case TIOCNXCL:
|
|
clear_bit(TTY_EXCLUSIVE, &tty->flags);
|
|
return 0;
|
|
case TIOCGEXCL:
|
|
{
|
|
int excl = test_bit(TTY_EXCLUSIVE, &tty->flags);
|
|
return put_user(excl, (int __user *)p);
|
|
}
|
|
case TIOCGETD:
|
|
return tiocgetd(tty, p);
|
|
case TIOCSETD:
|
|
return tiocsetd(tty, p);
|
|
case TIOCVHANGUP:
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
tty_vhangup(tty);
|
|
return 0;
|
|
case TIOCGDEV:
|
|
{
|
|
unsigned int ret = new_encode_dev(tty_devnum(real_tty));
|
|
return put_user(ret, (unsigned int __user *)p);
|
|
}
|
|
/*
|
|
* Break handling
|
|
*/
|
|
case TIOCSBRK: /* Turn break on, unconditionally */
|
|
if (tty->ops->break_ctl)
|
|
return tty->ops->break_ctl(tty, -1);
|
|
return 0;
|
|
case TIOCCBRK: /* Turn break off, unconditionally */
|
|
if (tty->ops->break_ctl)
|
|
return tty->ops->break_ctl(tty, 0);
|
|
return 0;
|
|
case TCSBRK: /* SVID version: non-zero arg --> no break */
|
|
/* non-zero arg means wait for all output data
|
|
* to be sent (performed above) but don't send break.
|
|
* This is used by the tcdrain() termios function.
|
|
*/
|
|
if (!arg)
|
|
return send_break(tty, 250);
|
|
return 0;
|
|
case TCSBRKP: /* support for POSIX tcsendbreak() */
|
|
return send_break(tty, arg ? arg*100 : 250);
|
|
|
|
case TIOCMGET:
|
|
return tty_tiocmget(tty, p);
|
|
case TIOCMSET:
|
|
case TIOCMBIC:
|
|
case TIOCMBIS:
|
|
return tty_tiocmset(tty, cmd, p);
|
|
case TIOCGICOUNT:
|
|
retval = tty_tiocgicount(tty, p);
|
|
/* For the moment allow fall through to the old method */
|
|
if (retval != -EINVAL)
|
|
return retval;
|
|
break;
|
|
case TCFLSH:
|
|
switch (arg) {
|
|
case TCIFLUSH:
|
|
case TCIOFLUSH:
|
|
/* flush tty buffer and allow ldisc to process ioctl */
|
|
tty_buffer_flush(tty, NULL);
|
|
break;
|
|
}
|
|
break;
|
|
case TIOCSSERIAL:
|
|
tty_warn_deprecated_flags(p);
|
|
break;
|
|
case TIOCGPTPEER:
|
|
/* Special because the struct file is needed */
|
|
return ptm_open_peer(file, tty, (int)arg);
|
|
default:
|
|
retval = tty_jobctrl_ioctl(tty, real_tty, file, cmd, arg);
|
|
if (retval != -ENOIOCTLCMD)
|
|
return retval;
|
|
}
|
|
if (tty->ops->ioctl) {
|
|
retval = tty->ops->ioctl(tty, cmd, arg);
|
|
if (retval != -ENOIOCTLCMD)
|
|
return retval;
|
|
}
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return hung_up_tty_ioctl(file, cmd, arg);
|
|
retval = -EINVAL;
|
|
if (ld->ops->ioctl) {
|
|
retval = ld->ops->ioctl(tty, file, cmd, arg);
|
|
if (retval == -ENOIOCTLCMD)
|
|
retval = -ENOTTY;
|
|
}
|
|
tty_ldisc_deref(ld);
|
|
return retval;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long tty_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct tty_struct *tty = file_tty(file);
|
|
struct tty_ldisc *ld;
|
|
int retval = -ENOIOCTLCMD;
|
|
|
|
if (tty_paranoia_check(tty, file_inode(file), "tty_ioctl"))
|
|
return -EINVAL;
|
|
|
|
if (tty->ops->compat_ioctl) {
|
|
retval = tty->ops->compat_ioctl(tty, cmd, arg);
|
|
if (retval != -ENOIOCTLCMD)
|
|
return retval;
|
|
}
|
|
|
|
ld = tty_ldisc_ref_wait(tty);
|
|
if (!ld)
|
|
return hung_up_tty_compat_ioctl(file, cmd, arg);
|
|
if (ld->ops->compat_ioctl)
|
|
retval = ld->ops->compat_ioctl(tty, file, cmd, arg);
|
|
else
|
|
retval = n_tty_compat_ioctl_helper(tty, file, cmd, arg);
|
|
tty_ldisc_deref(ld);
|
|
|
|
return retval;
|
|
}
|
|
#endif
|
|
|
|
static int this_tty(const void *t, struct file *file, unsigned fd)
|
|
{
|
|
if (likely(file->f_op->read != tty_read))
|
|
return 0;
|
|
return file_tty(file) != t ? 0 : fd + 1;
|
|
}
|
|
|
|
/*
|
|
* This implements the "Secure Attention Key" --- the idea is to
|
|
* prevent trojan horses by killing all processes associated with this
|
|
* tty when the user hits the "Secure Attention Key". Required for
|
|
* super-paranoid applications --- see the Orange Book for more details.
|
|
*
|
|
* This code could be nicer; ideally it should send a HUP, wait a few
|
|
* seconds, then send a INT, and then a KILL signal. But you then
|
|
* have to coordinate with the init process, since all processes associated
|
|
* with the current tty must be dead before the new getty is allowed
|
|
* to spawn.
|
|
*
|
|
* Now, if it would be correct ;-/ The current code has a nasty hole -
|
|
* it doesn't catch files in flight. We may send the descriptor to ourselves
|
|
* via AF_UNIX socket, close it and later fetch from socket. FIXME.
|
|
*
|
|
* Nasty bug: do_SAK is being called in interrupt context. This can
|
|
* deadlock. We punt it up to process context. AKPM - 16Mar2001
|
|
*/
|
|
void __do_SAK(struct tty_struct *tty)
|
|
{
|
|
#ifdef TTY_SOFT_SAK
|
|
tty_hangup(tty);
|
|
#else
|
|
struct task_struct *g, *p;
|
|
struct pid *session;
|
|
int i;
|
|
unsigned long flags;
|
|
|
|
if (!tty)
|
|
return;
|
|
|
|
spin_lock_irqsave(&tty->ctrl_lock, flags);
|
|
session = get_pid(tty->session);
|
|
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
|
|
|
|
tty_ldisc_flush(tty);
|
|
|
|
tty_driver_flush_buffer(tty);
|
|
|
|
read_lock(&tasklist_lock);
|
|
/* Kill the entire session */
|
|
do_each_pid_task(session, PIDTYPE_SID, p) {
|
|
tty_notice(tty, "SAK: killed process %d (%s): by session\n",
|
|
task_pid_nr(p), p->comm);
|
|
send_sig(SIGKILL, p, 1);
|
|
} while_each_pid_task(session, PIDTYPE_SID, p);
|
|
|
|
/* Now kill any processes that happen to have the tty open */
|
|
do_each_thread(g, p) {
|
|
if (p->signal->tty == tty) {
|
|
tty_notice(tty, "SAK: killed process %d (%s): by controlling tty\n",
|
|
task_pid_nr(p), p->comm);
|
|
send_sig(SIGKILL, p, 1);
|
|
continue;
|
|
}
|
|
task_lock(p);
|
|
i = iterate_fd(p->files, 0, this_tty, tty);
|
|
if (i != 0) {
|
|
tty_notice(tty, "SAK: killed process %d (%s): by fd#%d\n",
|
|
task_pid_nr(p), p->comm, i - 1);
|
|
force_sig(SIGKILL, p);
|
|
}
|
|
task_unlock(p);
|
|
} while_each_thread(g, p);
|
|
read_unlock(&tasklist_lock);
|
|
put_pid(session);
|
|
#endif
|
|
}
|
|
|
|
static void do_SAK_work(struct work_struct *work)
|
|
{
|
|
struct tty_struct *tty =
|
|
container_of(work, struct tty_struct, SAK_work);
|
|
__do_SAK(tty);
|
|
}
|
|
|
|
/*
|
|
* The tq handling here is a little racy - tty->SAK_work may already be queued.
|
|
* Fortunately we don't need to worry, because if ->SAK_work is already queued,
|
|
* the values which we write to it will be identical to the values which it
|
|
* already has. --akpm
|
|
*/
|
|
void do_SAK(struct tty_struct *tty)
|
|
{
|
|
if (!tty)
|
|
return;
|
|
schedule_work(&tty->SAK_work);
|
|
}
|
|
|
|
EXPORT_SYMBOL(do_SAK);
|
|
|
|
static int dev_match_devt(struct device *dev, const void *data)
|
|
{
|
|
const dev_t *devt = data;
|
|
return dev->devt == *devt;
|
|
}
|
|
|
|
/* Must put_device() after it's unused! */
|
|
static struct device *tty_get_device(struct tty_struct *tty)
|
|
{
|
|
dev_t devt = tty_devnum(tty);
|
|
return class_find_device(tty_class, NULL, &devt, dev_match_devt);
|
|
}
|
|
|
|
|
|
/**
|
|
* alloc_tty_struct
|
|
*
|
|
* This subroutine allocates and initializes a tty structure.
|
|
*
|
|
* Locking: none - tty in question is not exposed at this point
|
|
*/
|
|
|
|
struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx)
|
|
{
|
|
struct tty_struct *tty;
|
|
|
|
tty = kzalloc(sizeof(*tty), GFP_KERNEL);
|
|
if (!tty)
|
|
return NULL;
|
|
|
|
kref_init(&tty->kref);
|
|
tty->magic = TTY_MAGIC;
|
|
if (tty_ldisc_init(tty)) {
|
|
kfree(tty);
|
|
return NULL;
|
|
}
|
|
tty->session = NULL;
|
|
tty->pgrp = NULL;
|
|
mutex_init(&tty->legacy_mutex);
|
|
mutex_init(&tty->throttle_mutex);
|
|
init_rwsem(&tty->termios_rwsem);
|
|
mutex_init(&tty->winsize_mutex);
|
|
init_ldsem(&tty->ldisc_sem);
|
|
init_waitqueue_head(&tty->write_wait);
|
|
init_waitqueue_head(&tty->read_wait);
|
|
INIT_WORK(&tty->hangup_work, do_tty_hangup);
|
|
mutex_init(&tty->atomic_write_lock);
|
|
spin_lock_init(&tty->ctrl_lock);
|
|
spin_lock_init(&tty->flow_lock);
|
|
spin_lock_init(&tty->files_lock);
|
|
INIT_LIST_HEAD(&tty->tty_files);
|
|
INIT_WORK(&tty->SAK_work, do_SAK_work);
|
|
|
|
tty->driver = driver;
|
|
tty->ops = driver->ops;
|
|
tty->index = idx;
|
|
tty_line_name(driver, idx, tty->name);
|
|
tty->dev = tty_get_device(tty);
|
|
|
|
return tty;
|
|
}
|
|
|
|
/**
|
|
* tty_put_char - write one character to a tty
|
|
* @tty: tty
|
|
* @ch: character
|
|
*
|
|
* Write one byte to the tty using the provided put_char method
|
|
* if present. Returns the number of characters successfully output.
|
|
*
|
|
* Note: the specific put_char operation in the driver layer may go
|
|
* away soon. Don't call it directly, use this method
|
|
*/
|
|
|
|
int tty_put_char(struct tty_struct *tty, unsigned char ch)
|
|
{
|
|
if (tty->ops->put_char)
|
|
return tty->ops->put_char(tty, ch);
|
|
return tty->ops->write(tty, &ch, 1);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_put_char);
|
|
|
|
struct class *tty_class;
|
|
|
|
static int tty_cdev_add(struct tty_driver *driver, dev_t dev,
|
|
unsigned int index, unsigned int count)
|
|
{
|
|
int err;
|
|
|
|
/* init here, since reused cdevs cause crashes */
|
|
driver->cdevs[index] = cdev_alloc();
|
|
if (!driver->cdevs[index])
|
|
return -ENOMEM;
|
|
driver->cdevs[index]->ops = &tty_fops;
|
|
driver->cdevs[index]->owner = driver->owner;
|
|
err = cdev_add(driver->cdevs[index], dev, count);
|
|
if (err)
|
|
kobject_put(&driver->cdevs[index]->kobj);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* tty_register_device - register a tty device
|
|
* @driver: the tty driver that describes the tty device
|
|
* @index: the index in the tty driver for this tty device
|
|
* @device: a struct device that is associated with this tty device.
|
|
* This field is optional, if there is no known struct device
|
|
* for this tty device it can be set to NULL safely.
|
|
*
|
|
* Returns a pointer to the struct device for this tty device
|
|
* (or ERR_PTR(-EFOO) on error).
|
|
*
|
|
* This call is required to be made to register an individual tty device
|
|
* if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If
|
|
* that bit is not set, this function should not be called by a tty
|
|
* driver.
|
|
*
|
|
* Locking: ??
|
|
*/
|
|
|
|
struct device *tty_register_device(struct tty_driver *driver, unsigned index,
|
|
struct device *device)
|
|
{
|
|
return tty_register_device_attr(driver, index, device, NULL, NULL);
|
|
}
|
|
EXPORT_SYMBOL(tty_register_device);
|
|
|
|
static void tty_device_create_release(struct device *dev)
|
|
{
|
|
dev_dbg(dev, "releasing...\n");
|
|
kfree(dev);
|
|
}
|
|
|
|
/**
|
|
* tty_register_device_attr - register a tty device
|
|
* @driver: the tty driver that describes the tty device
|
|
* @index: the index in the tty driver for this tty device
|
|
* @device: a struct device that is associated with this tty device.
|
|
* This field is optional, if there is no known struct device
|
|
* for this tty device it can be set to NULL safely.
|
|
* @drvdata: Driver data to be set to device.
|
|
* @attr_grp: Attribute group to be set on device.
|
|
*
|
|
* Returns a pointer to the struct device for this tty device
|
|
* (or ERR_PTR(-EFOO) on error).
|
|
*
|
|
* This call is required to be made to register an individual tty device
|
|
* if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If
|
|
* that bit is not set, this function should not be called by a tty
|
|
* driver.
|
|
*
|
|
* Locking: ??
|
|
*/
|
|
struct device *tty_register_device_attr(struct tty_driver *driver,
|
|
unsigned index, struct device *device,
|
|
void *drvdata,
|
|
const struct attribute_group **attr_grp)
|
|
{
|
|
char name[64];
|
|
dev_t devt = MKDEV(driver->major, driver->minor_start) + index;
|
|
struct ktermios *tp;
|
|
struct device *dev;
|
|
int retval;
|
|
|
|
if (index >= driver->num) {
|
|
pr_err("%s: Attempt to register invalid tty line number (%d)\n",
|
|
driver->name, index);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (driver->type == TTY_DRIVER_TYPE_PTY)
|
|
pty_line_name(driver, index, name);
|
|
else
|
|
tty_line_name(driver, index, name);
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
dev->devt = devt;
|
|
dev->class = tty_class;
|
|
dev->parent = device;
|
|
dev->release = tty_device_create_release;
|
|
dev_set_name(dev, "%s", name);
|
|
dev->groups = attr_grp;
|
|
dev_set_drvdata(dev, drvdata);
|
|
|
|
dev_set_uevent_suppress(dev, 1);
|
|
|
|
retval = device_register(dev);
|
|
if (retval)
|
|
goto err_put;
|
|
|
|
if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
|
|
/*
|
|
* Free any saved termios data so that the termios state is
|
|
* reset when reusing a minor number.
|
|
*/
|
|
tp = driver->termios[index];
|
|
if (tp) {
|
|
driver->termios[index] = NULL;
|
|
kfree(tp);
|
|
}
|
|
|
|
retval = tty_cdev_add(driver, devt, index, 1);
|
|
if (retval)
|
|
goto err_del;
|
|
}
|
|
|
|
dev_set_uevent_suppress(dev, 0);
|
|
kobject_uevent(&dev->kobj, KOBJ_ADD);
|
|
|
|
return dev;
|
|
|
|
err_del:
|
|
device_del(dev);
|
|
err_put:
|
|
put_device(dev);
|
|
|
|
return ERR_PTR(retval);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_register_device_attr);
|
|
|
|
/**
|
|
* tty_unregister_device - unregister a tty device
|
|
* @driver: the tty driver that describes the tty device
|
|
* @index: the index in the tty driver for this tty device
|
|
*
|
|
* If a tty device is registered with a call to tty_register_device() then
|
|
* this function must be called when the tty device is gone.
|
|
*
|
|
* Locking: ??
|
|
*/
|
|
|
|
void tty_unregister_device(struct tty_driver *driver, unsigned index)
|
|
{
|
|
device_destroy(tty_class,
|
|
MKDEV(driver->major, driver->minor_start) + index);
|
|
if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
|
|
cdev_del(driver->cdevs[index]);
|
|
driver->cdevs[index] = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(tty_unregister_device);
|
|
|
|
/**
|
|
* __tty_alloc_driver -- allocate tty driver
|
|
* @lines: count of lines this driver can handle at most
|
|
* @owner: module which is responsible for this driver
|
|
* @flags: some of TTY_DRIVER_* flags, will be set in driver->flags
|
|
*
|
|
* This should not be called directly, some of the provided macros should be
|
|
* used instead. Use IS_ERR and friends on @retval.
|
|
*/
|
|
struct tty_driver *__tty_alloc_driver(unsigned int lines, struct module *owner,
|
|
unsigned long flags)
|
|
{
|
|
struct tty_driver *driver;
|
|
unsigned int cdevs = 1;
|
|
int err;
|
|
|
|
if (!lines || (flags & TTY_DRIVER_UNNUMBERED_NODE && lines > 1))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
driver = kzalloc(sizeof(struct tty_driver), GFP_KERNEL);
|
|
if (!driver)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
kref_init(&driver->kref);
|
|
driver->magic = TTY_DRIVER_MAGIC;
|
|
driver->num = lines;
|
|
driver->owner = owner;
|
|
driver->flags = flags;
|
|
|
|
if (!(flags & TTY_DRIVER_DEVPTS_MEM)) {
|
|
driver->ttys = kcalloc(lines, sizeof(*driver->ttys),
|
|
GFP_KERNEL);
|
|
driver->termios = kcalloc(lines, sizeof(*driver->termios),
|
|
GFP_KERNEL);
|
|
if (!driver->ttys || !driver->termios) {
|
|
err = -ENOMEM;
|
|
goto err_free_all;
|
|
}
|
|
}
|
|
|
|
if (!(flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
|
|
driver->ports = kcalloc(lines, sizeof(*driver->ports),
|
|
GFP_KERNEL);
|
|
if (!driver->ports) {
|
|
err = -ENOMEM;
|
|
goto err_free_all;
|
|
}
|
|
cdevs = lines;
|
|
}
|
|
|
|
driver->cdevs = kcalloc(cdevs, sizeof(*driver->cdevs), GFP_KERNEL);
|
|
if (!driver->cdevs) {
|
|
err = -ENOMEM;
|
|
goto err_free_all;
|
|
}
|
|
|
|
return driver;
|
|
err_free_all:
|
|
kfree(driver->ports);
|
|
kfree(driver->ttys);
|
|
kfree(driver->termios);
|
|
kfree(driver->cdevs);
|
|
kfree(driver);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL(__tty_alloc_driver);
|
|
|
|
static void destruct_tty_driver(struct kref *kref)
|
|
{
|
|
struct tty_driver *driver = container_of(kref, struct tty_driver, kref);
|
|
int i;
|
|
struct ktermios *tp;
|
|
|
|
if (driver->flags & TTY_DRIVER_INSTALLED) {
|
|
for (i = 0; i < driver->num; i++) {
|
|
tp = driver->termios[i];
|
|
if (tp) {
|
|
driver->termios[i] = NULL;
|
|
kfree(tp);
|
|
}
|
|
if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV))
|
|
tty_unregister_device(driver, i);
|
|
}
|
|
proc_tty_unregister_driver(driver);
|
|
if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)
|
|
cdev_del(driver->cdevs[0]);
|
|
}
|
|
kfree(driver->cdevs);
|
|
kfree(driver->ports);
|
|
kfree(driver->termios);
|
|
kfree(driver->ttys);
|
|
kfree(driver);
|
|
}
|
|
|
|
void tty_driver_kref_put(struct tty_driver *driver)
|
|
{
|
|
kref_put(&driver->kref, destruct_tty_driver);
|
|
}
|
|
EXPORT_SYMBOL(tty_driver_kref_put);
|
|
|
|
void tty_set_operations(struct tty_driver *driver,
|
|
const struct tty_operations *op)
|
|
{
|
|
driver->ops = op;
|
|
};
|
|
EXPORT_SYMBOL(tty_set_operations);
|
|
|
|
void put_tty_driver(struct tty_driver *d)
|
|
{
|
|
tty_driver_kref_put(d);
|
|
}
|
|
EXPORT_SYMBOL(put_tty_driver);
|
|
|
|
/*
|
|
* Called by a tty driver to register itself.
|
|
*/
|
|
int tty_register_driver(struct tty_driver *driver)
|
|
{
|
|
int error;
|
|
int i;
|
|
dev_t dev;
|
|
struct device *d;
|
|
|
|
if (!driver->major) {
|
|
error = alloc_chrdev_region(&dev, driver->minor_start,
|
|
driver->num, driver->name);
|
|
if (!error) {
|
|
driver->major = MAJOR(dev);
|
|
driver->minor_start = MINOR(dev);
|
|
}
|
|
} else {
|
|
dev = MKDEV(driver->major, driver->minor_start);
|
|
error = register_chrdev_region(dev, driver->num, driver->name);
|
|
}
|
|
if (error < 0)
|
|
goto err;
|
|
|
|
if (driver->flags & TTY_DRIVER_DYNAMIC_ALLOC) {
|
|
error = tty_cdev_add(driver, dev, 0, driver->num);
|
|
if (error)
|
|
goto err_unreg_char;
|
|
}
|
|
|
|
mutex_lock(&tty_mutex);
|
|
list_add(&driver->tty_drivers, &tty_drivers);
|
|
mutex_unlock(&tty_mutex);
|
|
|
|
if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV)) {
|
|
for (i = 0; i < driver->num; i++) {
|
|
d = tty_register_device(driver, i, NULL);
|
|
if (IS_ERR(d)) {
|
|
error = PTR_ERR(d);
|
|
goto err_unreg_devs;
|
|
}
|
|
}
|
|
}
|
|
proc_tty_register_driver(driver);
|
|
driver->flags |= TTY_DRIVER_INSTALLED;
|
|
return 0;
|
|
|
|
err_unreg_devs:
|
|
for (i--; i >= 0; i--)
|
|
tty_unregister_device(driver, i);
|
|
|
|
mutex_lock(&tty_mutex);
|
|
list_del(&driver->tty_drivers);
|
|
mutex_unlock(&tty_mutex);
|
|
|
|
err_unreg_char:
|
|
unregister_chrdev_region(dev, driver->num);
|
|
err:
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(tty_register_driver);
|
|
|
|
/*
|
|
* Called by a tty driver to unregister itself.
|
|
*/
|
|
int tty_unregister_driver(struct tty_driver *driver)
|
|
{
|
|
#if 0
|
|
/* FIXME */
|
|
if (driver->refcount)
|
|
return -EBUSY;
|
|
#endif
|
|
unregister_chrdev_region(MKDEV(driver->major, driver->minor_start),
|
|
driver->num);
|
|
mutex_lock(&tty_mutex);
|
|
list_del(&driver->tty_drivers);
|
|
mutex_unlock(&tty_mutex);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(tty_unregister_driver);
|
|
|
|
dev_t tty_devnum(struct tty_struct *tty)
|
|
{
|
|
return MKDEV(tty->driver->major, tty->driver->minor_start) + tty->index;
|
|
}
|
|
EXPORT_SYMBOL(tty_devnum);
|
|
|
|
void tty_default_fops(struct file_operations *fops)
|
|
{
|
|
*fops = tty_fops;
|
|
}
|
|
|
|
static char *tty_devnode(struct device *dev, umode_t *mode)
|
|
{
|
|
if (!mode)
|
|
return NULL;
|
|
if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) ||
|
|
dev->devt == MKDEV(TTYAUX_MAJOR, 2))
|
|
*mode = 0666;
|
|
return NULL;
|
|
}
|
|
|
|
static int __init tty_class_init(void)
|
|
{
|
|
tty_class = class_create(THIS_MODULE, "tty");
|
|
if (IS_ERR(tty_class))
|
|
return PTR_ERR(tty_class);
|
|
tty_class->devnode = tty_devnode;
|
|
return 0;
|
|
}
|
|
|
|
postcore_initcall(tty_class_init);
|
|
|
|
/* 3/2004 jmc: why do these devices exist? */
|
|
static struct cdev tty_cdev, console_cdev;
|
|
|
|
static ssize_t show_cons_active(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct console *cs[16];
|
|
int i = 0;
|
|
struct console *c;
|
|
ssize_t count = 0;
|
|
|
|
console_lock();
|
|
for_each_console(c) {
|
|
if (!c->device)
|
|
continue;
|
|
if (!c->write)
|
|
continue;
|
|
if ((c->flags & CON_ENABLED) == 0)
|
|
continue;
|
|
cs[i++] = c;
|
|
if (i >= ARRAY_SIZE(cs))
|
|
break;
|
|
}
|
|
while (i--) {
|
|
int index = cs[i]->index;
|
|
struct tty_driver *drv = cs[i]->device(cs[i], &index);
|
|
|
|
/* don't resolve tty0 as some programs depend on it */
|
|
if (drv && (cs[i]->index > 0 || drv->major != TTY_MAJOR))
|
|
count += tty_line_name(drv, index, buf + count);
|
|
else
|
|
count += sprintf(buf + count, "%s%d",
|
|
cs[i]->name, cs[i]->index);
|
|
|
|
count += sprintf(buf + count, "%c", i ? ' ':'\n');
|
|
}
|
|
console_unlock();
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR(active, S_IRUGO, show_cons_active, NULL);
|
|
|
|
static struct attribute *cons_dev_attrs[] = {
|
|
&dev_attr_active.attr,
|
|
NULL
|
|
};
|
|
|
|
ATTRIBUTE_GROUPS(cons_dev);
|
|
|
|
static struct device *consdev;
|
|
|
|
void console_sysfs_notify(void)
|
|
{
|
|
if (consdev)
|
|
sysfs_notify(&consdev->kobj, NULL, "active");
|
|
}
|
|
|
|
/*
|
|
* Ok, now we can initialize the rest of the tty devices and can count
|
|
* on memory allocations, interrupts etc..
|
|
*/
|
|
int __init tty_init(void)
|
|
{
|
|
tty_sysctl_init();
|
|
cdev_init(&tty_cdev, &tty_fops);
|
|
if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) ||
|
|
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0)
|
|
panic("Couldn't register /dev/tty driver\n");
|
|
device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty");
|
|
|
|
cdev_init(&console_cdev, &console_fops);
|
|
if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) ||
|
|
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0)
|
|
panic("Couldn't register /dev/console driver\n");
|
|
consdev = device_create_with_groups(tty_class, NULL,
|
|
MKDEV(TTYAUX_MAJOR, 1), NULL,
|
|
cons_dev_groups, "console");
|
|
if (IS_ERR(consdev))
|
|
consdev = NULL;
|
|
|
|
#ifdef CONFIG_VT
|
|
vty_init(&console_fops);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|