Alex Smith 0e4c57c863 recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules ... commit 91ad11d7cc upstream. 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: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7098/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-07-06 18:49:19 -07:00
..
basic	fixdep: fix extraneous dependencies	2011-09-09 11:45:47 +02:00
coccinelle	Merge branch 'akpm' (Andrew's patch-bomb)	2012-04-05 15:30:34 -07:00
dtc	scripts: dtc: fix compile warnings	2012-03-24 23:07:35 +01:00
genksyms	scripts/genksyms: clean lex/yacc generated files	2012-01-08 14:48:15 +01:00
kconfig	localmodconfig: Fix localyesconfig to set to 'y' not 'm'	2012-10-13 05:38:39 +09:00
ksymoops
mod	powerpc: Add vr save/restore functions	2014-05-18 05:25:56 -07:00
package	deb-pkg: Fix cross-building linux-headers package	2014-03-30 21:40:30 -07:00
rt-tester	Fix common misspellings	2011-03-31 11:26:23 -03:00
selinux	Create Documentation/security/,	2011-05-19 15:59:38 -07:00
tracing
.gitignore	kbuild: move scripts/basic/docproc.c to scripts/docproc.c	2011-05-02 22:48:03 +02:00
bin2c.c
bloat-o-meter	bloat-o-meter: include read-only data section in report	2011-03-22 17:44:17 -07:00
bootgraph.pl	bootgraph.pl: relax timing information requirements	2011-06-13 00:04:57 +02:00
checkincludes.pl	checkincludes: fix perlcritic warnings	2010-03-07 21:19:57 +01:00
checkkconfigsymbols.sh	checkkconfigsymbols.sh: Kconfig symbols sometimes have lowercase letters	2010-06-03 10:39:39 +02:00
checkpatch.pl	checkpatch: revert --strict test for net/ and drivers/net block comment style	2012-04-16 12:44:38 -07:00
checkstack.pl	Haavard Skinnemoen has left Atmel	2011-05-18 23:24:50 +02:00
checksyscalls.sh	checksyscalls: Use arch/x86/syscalls/syscall_32.tbl as source	2011-11-17 13:35:37 -08:00
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	coccicheck: change handling of C={1,2} when M= is set	2012-02-24 23:50:19 +01:00
config	kbuild: add numeric --set-val option to scripts/config	2010-12-15 15:44:31 +01:00
conmakehash.c
decodecode	scripts: decodecode: remove bashisms	2010-06-04 10:26:35 +02:00
depmod.sh	kbuild: do not check for ancient modutils tools	2012-01-23 15:12:19 +01:00
diffconfig
docproc.c	docproc: cleanup brace placement	2011-06-16 20:40:03 +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	ARM: 7333/2: jump label: detect %c support for ARM	2012-03-24 09:38:56 +00:00
gcc-version.sh	kbuild: Fix gcc -x syntax	2012-10-13 05:38:37 +09:00
gcc-x86_32-has-stack-protector.sh	kbuild: Fix gcc -x syntax	2012-10-13 05:38:37 +09:00
gcc-x86_64-has-stack-protector.sh	kbuild: Fix gcc -x syntax	2012-10-13 05:38:37 +09:00
gen_initramfs_list.sh	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-05-24 13:31:37 -07:00
get_maintainer.pl	get_maintainer.pl: add support for moderated lists	2012-03-23 16:58:32 -07:00
gfp-translate	scripts: fix gfp-translate for recent changes to gfp.h	2010-11-25 06:50:49 +09:00
headerdep.pl	headerdep: perlcritic warning	2010-03-23 12:26:38 +01:00
headers.sh	kbuild, headers.sh: Don't make archheaders explicitly	2011-11-22 14:47:50 -08:00
headers_check.pl	headers_check: recursively search for linux/types.h inclusion	2012-03-26 14:54:27 +02:00
headers_install.pl	headers_install: fix __packed in exported kernel headers	2011-06-24 16:56:05 +02:00
kallsyms.c	scripts/kallsyms.c: fix potential segfault	2011-05-12 17:23:40 +02:00
Kbuild.include	kbuild: Fix gcc -x syntax	2012-10-13 05:38:37 +09:00
kernel-doc	kernel-doc: bugfix - multi-line macros	2013-10-01 09:10:52 -07:00
Lindent
Makefile	x86, realmode: 16-bit real-mode code support for relocs tool	2012-05-18 19:49:40 -07:00
Makefile.asm-generic	kbuild: silence Nothing to be done for 'all' message	2011-06-09 11:48:19 +02:00
Makefile.build	kbuild: disable -Wmissing-field-initializers for W=1	2012-01-26 11:07:26 +01:00
Makefile.clean	kbuild: Really don't clean bounds.h and asm-offsets.h	2010-03-11 11:15:22 +01:00
Makefile.fwinst
Makefile.headersinst	kbuild: Add support for installing generated asm headers	2011-11-17 13:14:36 -08:00
Makefile.help	Add a target to use the Coccinelle checker	2010-06-12 00:00:29 +02:00
Makefile.host
Makefile.lib	Kbuild: centralize MKIMAGE and cmd_uimage definitions	2012-03-26 15:49:20 +02:00
Makefile.modbuiltin	kbuild: Create output directory in Makefile.modbuiltin	2010-06-10 12:23:08 +02:00
Makefile.modinst
Makefile.modpost	Merge commit 'v3.0-rc1' into kbuild/kbuild	2011-06-07 15:37:51 +02:00
makelst
markup_oops.pl	Merge branch 'for-35' of git://repo.or.cz/linux-kbuild	2010-06-01 08:55:52 -07:00
mkcompile_h	Fix handling of backlash character in LINUX_COMPILE_BY name	2011-04-29 15:55:45 +02:00
mkmakefile	kbuild: silence generated makefile message	2011-07-20 17:08:08 +02:00
mksysmap
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
patch-kernel	scripts/patch-kernel: digest kernel.org hosted .xz patches	2012-03-30 15:23:36 +02:00
pnmtologo.c
profile2linkerlist.pl	profile2linkerlist: fix perl warnings	2010-03-07 21:39:33 +01:00
recordmcount.c	ftrace/s390: mcount offset calculation	2011-05-16 15:05:06 -04:00
recordmcount.h	recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules	2014-07-06 18:49:19 -07:00
recordmcount.pl	ftrace/s390: mcount offset calculation	2011-05-16 15:05:06 -04:00
setlocalversion	setlocalversion: Use "grep -q" instead of piping output to "read dummy"	2012-03-26 22:54:00 +02:00
show_delta	scripts: change scripts to use system python instead of env	2010-02-02 14:33:56 +01:00
tags.sh	Subject: [PATCH] tags.sh: Add missing quotes	2012-04-02 11:28:17 +02:00
unifdef.c	unifdef: update to upstream version 2.5	2011-01-22 15:50:59 +01:00
ver_linux
xz_wrap.sh	xz: Enable BCJ filters on SPARC and 32-bit x86	2012-04-18 13:13:18 -07:00