c62f7d037b
Unhashed alias is allowed to exist In the latest upstream kernel exfat driver It does not have to generate panic in this case Porting this handling to exfat-nofuse driver from url https://git.kernel.org/pub/scm/linux/kernel/git/ stable/linux.git/tree/fs/exfat/namei.c?h=v5.10.8#n724 Panic stack trace: kernel BUG at ../../motorola/kernel/modules/fs/exfat/exfat_super.c:874! [ 759.284483] pc : exfat_lookup+0x1dc/0x1e0 [exfat] [ 759.284496] lr : exfat_lookup+0x144/0x1e0 [exfat] [ 759.284502] sp : ffffff800ea2b9d0 [ 759.284507] x29: ffffff800ea2ba20 x28: fffffff6f3cf8000 [ 759.284515] x27: 0000000000000000 x26: 0000000000000000 [ 759.284523] x25: 0000000056000000 x24: fffffff7b8742d88 [ 759.284530] x23: 0000000000004000 x22: fffffff883b08390 [ 759.284538] x21: fffffff7b874b228 x20: fffffff86d375000 [ 759.284546] x19: fffffff883b08980 x18: 0000000007270df4 [ 759.284553] x17: 0000000000000000 x16: ffffff9bebd5c9b8 [ 759.284561] x15: fffffff6f976ba00 x14: 0000000000000041 [ 759.284569] x13: ffffff9bede96590 x12: fffffff6f89f7b00 [ 759.284576] x11: 2cf70e9f45774b00 x10: 0000000000000000 [ 759.284584] x9 : 0000000000000000 x8 : 0000000000000000 [ 759.284591] x7 : ffffff9bec02e394 x6 : 0000000000000000 [ 759.284599] x5 : 0000000000000000 x4 : 0000000000000001 [ 759.284606] x3 : 0000000000000000 x2 : ffffff9bebd5ca84 [ 759.284614] x1 : 0000000000000001 x0 : fffffff883b08390 [ 759.284622] Call trace: [ 759.284636] exfat_lookup+0x1dc/0x1e0 [exfat] [ 759.284650] __lookup_slow+0x9c/0x188 [ 759.284658] walk_component+0x1d0/0x868 [ 759.284665] path_lookupat+0xb8/0x210 [ 759.284672] filename_lookup+0x98/0x1c8 [ 759.284679] user_path_at_empty+0x54/0x68 [ 759.284688] vfs_statx+0x90/0x130 [ 759.284695] __arm64_sys_newfstatat+0x40/0x80 [ 759.284704] el0_svc_common+0xa0/0x170 [ 759.284711] el0_svc_handler+0x6c/0x88 [ 759.284719] el0_svc+0x8/0xc [ 759.284728] Code: 17ffffa7 92800176 17ffffec 940018f2 (d4210000) Change-Id: I5fb26e2416f70733fe2010484740513dc9a8c5d0 Signed-off-by: a17671 <a17671@motorola.com> Reviewed-on: https://gerrit.mot.com/1853335 SLTApproved: Slta Waiver SME-Granted: SME Approvals Granted Tested-by: Jira Key Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com> Submit-Approved: Jira Key |
||
|---|---|---|
| .. | ||
| Android.mk | ||
| dkms.conf | ||
| exfat-km.mk | ||
| exfat_api.c | ||
| exfat_api.h | ||
| exfat_bitmap.c | ||
| exfat_bitmap.h | ||
| exfat_blkdev.c | ||
| exfat_blkdev.h | ||
| exfat_cache.c | ||
| exfat_cache.h | ||
| exfat_config.h | ||
| exfat_core.c | ||
| exfat_core.h | ||
| exfat_data.c | ||
| exfat_data.h | ||
| exfat_nls.c | ||
| exfat_nls.h | ||
| exfat_oal.c | ||
| exfat_oal.h | ||
| exfat_super.c | ||
| exfat_super.h | ||
| exfat_upcase.c | ||
| exfat_version.h | ||
| Kbuild | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| README.md | ||
exfat-nofuse
Linux non-fuse read/write kernel driver for the exFAT, FAT12, FAT16 and vfat (FAT32) file systems.
Originally ported from Android kernel v3.0.
Kudos to ksv1986 for the mutex patch!
Thanks to JackNorris for being awesome and providing the clear_inode() patch.
Big thanks to lqs for completing the driver!
Big thanks to benpicco for fixing 3.11.y compatibility!
Special thanks to github user AndreiLux for spreading the word about the leak!
Installing as a stand-alone module:
make
sudo make install
To load the driver manually, run this as root:
modprobe exfat
You may also specify custom toolchains by using CROSS_COMPILE flag, in my case:
CROSS_COMPILE=../dorimanx-SG2-I9100-Kernel/android-toolchain/bin/arm-eabi-
Installing as a part of the kernel:
Let's take [linux] as the path to your kernel source dir...
cd [linux]
cp -rvf exfat-nofuse [linux]/fs/exfat
edit [linux]/fs/Kconfig
menu "DOS/FAT/NT Filesystems"
source "fs/fat/Kconfig"
+source "fs/exfat/Kconfig"
source "fs/ntfs/Kconfig"
endmenu
edit [linux]/fs/Makefile
obj-$(CONFIG_FAT_FS) += fat/
+obj-$(CONFIG_EXFAT_FS) += exfat/
obj-$(CONFIG_BFS_FS) += bfs/
cd [linux]
make menuconfig
Go to:
File systems > DOS/FAT/NT check exfat as MODULE (M) (437) Default codepage for exFAT (utf8) Default iocharset for exFAT
ESC to main menu Save an Alternate Configuration File ESC ESC
build your kernel
Have fun.
Installing as a DKMS module:
You can have even more fun with exfat-nofuse by installing it as a DKMS module has the main advantage of being auto-compiled (and thus, possibly surviving) between kernel upgrades.
First, get dkms. On Ubuntu this should be:
sudo apt install dkms
Then copy the root of this repository to /usr/share:
sudo cp -R . /usr/src/exfat-1.2.8 (or whatever version number declared on dkms.conf is)
sudo dkms add -m exfat -v 1.2.8
Build and load the module:
sudo dkms build -m exfat -v 1.2.8
sudo dkms install -m exfat -v 1.2.8
Now you have a proper dkms module that will work for a long time... hopefully.