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Alex Smith 91ad11d7cc recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules 
On MIPS calls to _mcount in modules generate 2 instructions to load
the _mcount address (and therefore 2 relocations). The mcount_loc
table should only reference the first of these, so the second is
filtered out by checking the relocation offset and ignoring ones that
immediately follow the previous one seen.

However if a module has an _mcount call at offset 0, the second
relocation would not be filtered out due to old_r_offset == 0
being taken to mean that the current relocation is the first one
seen, and both would end up in the mcount_loc table.

This results in ftrace_make_nop() patching both (adjacent)
instructions to branches over the _mcount call sequence like so:

  0xffffffffc08a8000:  04 00 00 10     b       0xffffffffc08a8014
  0xffffffffc08a8004:  04 00 00 10     b       0xffffffffc08a8018
  0xffffffffc08a8008:  2d 08 e0 03     move    at,ra
  ...

The second branch is in the delay slot of the first, which is
defined to be unpredictable - on the platform on which this bug was
encountered, it triggers a reserved instruction exception.

Fix by initializing old_r_offset to ~0 and using that instead of 0
to determine whether the current relocation is the first seen.

Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7098/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-06-26 10:48:19 +01:00
..
basic kbuild: trivial - use tabs for code indent where possible 2014-06-10 14:00:53 +02:00
coccinelle coccicheck: Add unneeded return variable test 2014-06-10 14:36:30 +02:00
dtc kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
genksyms genksyms: fix typeof() handling 2014-04-03 16:20:52 -07:00
kconfig Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-06-12 21:29:20 -07:00
ksymoops
mod Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-06-12 21:29:20 -07:00
package Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-06-12 21:29:20 -07:00
rt-tester kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
selinux kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
tracing tracing, perf: Convert the power tracer into an event tracer 2009-09-19 11:42:12 +02:00
.gitignore X.509: Add simple ASN.1 grammar compiler 2012-10-08 13:50:19 +10:30
analyze_suspend.py PM / tools: new tool for suspend/resume performance optimization 2014-01-17 01:47:26 +01:00
asn1_compiler.c X.509: remove possible code fragility: enumeration values not handled 2013-09-25 17:17:01 +01:00
bin2c.c
bloat-o-meter scripts/bloat-o-meter: use .startswith rather than fragile slicing 2013-11-07 10:47:13 +01:00
bootgraph.pl scripts/bootgraph.pl: Add graphic header 2014-04-08 17:15:15 +02:00
checkincludes.pl checkincludes: fix perlcritic warnings 2010-03-07 21:19:57 +01:00
checkkconfigsymbols.sh scripts/checkkconfigsymbols.sh: replace echo -e with printf 2013-08-28 17:00:47 +02:00
checkpatch.pl scripts/checkpatch.pl: device_initcall is not the only __initcall substitute 2014-06-04 16:54:20 -07:00
checkstack.pl kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
checksyscalls.sh scripts/checksyscalls.sh: Make renameat optional 2014-05-20 10:59:38 +02:00
checkversion.pl kbuild: don't warn about include/linux/version.h not including itself 2011-04-29 15:38:55 +02:00
cleanfile
cleanpatch
coccicheck Coccinelle: Update information about the minimal version required 2013-07-03 22:58:20 +02:00
config kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
conmakehash.c kbuild: trivial - remove trailing spaces 2014-04-30 17:34:32 +02:00
decode_stacktrace.sh decode_stacktrace: make stack dump output useful again 2014-06-10 15:29:43 -07:00
decodecode scripts/decodecode: make faulting insn ptr more robust 2013-04-29 15:54:27 -07:00
depmod.sh depmod: pass -P $CONFIG_SYMBOL_PREFIX 2013-02-22 11:52:31 +01:00
diffconfig diffconfig: Update script to support python versions 2.5 through 3.3 2013-09-01 21:24:51 +02:00
docproc.c kbuild: trivial - use tabs for code indent where possible 2014-06-10 14:00:53 +02:00
export_report.pl export_report: use warn() to issue WARNING, so they go to stderr 2011-05-24 16:07:07 +02:00
extract-ikconfig scripts/extract-ikconfig: add xz compression support 2011-02-10 15:23:03 +01:00
extract-vmlinux scripts: add extract-vmlinux 2011-08-31 16:12:17 +02:00
gcc-goto.sh arm64, jump label: detect %c support for ARM64 2014-01-08 15:21:29 +00:00
gcc-ld Kbuild, lto: Add a gcc-ld script to let run gcc as ld 2014-02-13 20:25:02 -08:00
gcc-version.sh kbuild: Fix gcc -x syntax 2012-10-03 09:03:24 +02:00
gcc-x86_32-has-stack-protector.sh kbuild: Fix gcc -x syntax 2012-10-03 09:03:24 +02:00
gcc-x86_64-has-stack-protector.sh kbuild: Fix gcc -x syntax 2012-10-03 09:03:24 +02:00
gen_initramfs_list.sh scripts/gen_initramfs_list.sh: fix flags for initramfs LZ4 compression 2014-03-04 07:55:48 -08:00
get_maintainer.pl get_maintainer: fix detection of git repository 2014-02-10 16:01:40 -08:00
gfp-translate chmod +x scripts/gfp-translate 2012-06-27 12:44:29 -07:00
headerdep.pl headerdep: perlcritic warning 2010-03-23 12:26:38 +01:00
headers.sh kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
headers_check.pl headers_check: special case seqbuf_dump() 2014-01-23 16:36:55 -08:00
headers_install.sh kbuild: fix make headers_install when path is too long 2013-05-17 22:10:35 +02:00
kallsyms.c kbuild: trivial - use tabs for code indent where possible 2014-06-10 14:00:53 +02:00
Kbuild.include Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-04-07 17:52:31 -07:00
kernel-doc Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2013-11-15 14:09:15 -08:00
ld-version.sh Kbuild, lto: add ld-version and ld-ifversion macros 2014-02-13 20:25:00 -08:00
Lindent
link-vmlinux.sh kallsyms: fix percpu vars on x86-64 with relocation. 2014-03-17 14:55:27 +10:30
Makefile kbuild: do not add "selinux" to subdir- twice 2014-06-09 23:24:59 +02:00
Makefile.asm-generic kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
Makefile.build kbuild: trivial - remove trailing spaces 2014-04-30 17:34:32 +02:00
Makefile.clean kbuild: Really don't clean bounds.h and asm-offsets.h 2010-03-11 11:15:22 +01:00
Makefile.extrawarn kbuild: move extra gcc checks to scripts/Makefile.extrawarn 2014-04-16 23:28:41 +02:00
Makefile.fwinst firmware: Simplify directory creation 2014-05-14 22:43:04 +02:00
Makefile.headersinst kbuild: fix make headers_install when path is too long 2013-05-17 22:10:35 +02:00
Makefile.help Add a target to use the Coccinelle checker 2010-06-12 00:00:29 +02:00
Makefile.host Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-06-12 21:29:20 -07:00
Makefile.lib kbuild: trivial - remove trailing spaces 2014-04-30 17:34:32 +02:00
Makefile.modbuiltin kbuild: Create output directory in Makefile.modbuiltin 2010-06-10 12:23:08 +02:00
Makefile.modinst modules: don't break modules_install on external modules with no key. 2012-11-06 11:52:24 +10:30
Makefile.modpost modpost: Optionally ignore secondary errors seen if a single module build fails 2013-09-23 15:45:03 +09:30
Makefile.modsign MODSIGN: Add modules_sign make target 2012-12-14 13:05:28 +10:30
makelst
markup_oops.pl kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
mkcompile_h kbuild: trivial - remove trailing spaces 2014-04-30 17:34:32 +02:00
mkmakefile kbuild: support simultaneous "make %config" and "make all" 2014-04-30 16:45:16 +02:00
mksysmap kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
mkuboot.sh mkuboot.sh: Fail if mkimage is missing 2011-01-07 14:31:01 +01:00
mkversion
module-common.lds module: Sort exported symbols 2011-05-19 16:55:27 +09:30
namespace.pl Revert "namespace: add source file location exceptions" 2010-10-28 00:59:56 +02:00
objdiff scripts: objdiff: support directories for the augument of record command 2014-06-10 14:59:33 +02:00
patch-kernel kbuild: trivial - remove trailing spaces 2014-04-30 17:34:32 +02:00
pnmtologo.c kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
profile2linkerlist.pl profile2linkerlist: fix perl warnings 2010-03-07 21:39:33 +01:00
recordmcount.c Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-06-12 21:29:20 -07:00
recordmcount.h recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules 2014-06-26 10:48:19 +01:00
recordmcount.pl ftrace: Add arm64 support to recordmcount 2014-05-29 09:04:31 +01:00
setlocalversion Fix detectition of kernel git repository in setlocalversion script [take #2] 2014-01-03 14:48:42 +01:00
show_delta kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
sign-file MODSIGN: Add -s <signature> option to sign-file 2013-01-25 16:55:36 +10:30
sortextable.c xtensa: enable sorting extable at build time 2014-04-02 01:35:50 +04:00
sortextable.h scripts/sortextable: support objects with more than 64K sections. 2013-11-13 12:09:00 +09:00
tags.sh kbuild: trivial - use tabs for code indent where possible 2014-06-10 14:00:53 +02:00
unifdef.c unifdef: update to upstream version 2.5 2011-01-22 15:50:59 +01:00
ver_linux Remove bashisms from scripts 2009-06-09 22:37:54 +02:00
xz_wrap.sh xz: Enable BCJ filters on SPARC and 32-bit x86 2012-04-18 13:13:18 -07:00