Alex Smith e16046836e recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules ... commit 91ad11d7cc6f4472ebf177a6252fbf0fd100d798 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 18:54:13 -07:00
..
basic	kbuild: fixdep: support concatenated dep files	2013-04-05 12:22:58 -06:00
coccinelle	Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2013-02-27 12:27:18 -08:00
dtc	dtc: ensure #line directives don't consume data from the next line	2013-06-13 22:12:15 +01:00
genksyms	genksyms: pass symbol-prefix instead of arch	2013-03-20 11:27:27 +10:30
kconfig	kconfig/menu.c: fix multiple references to expressions in menu_add_prop()	2013-05-30 00:14:01 +02:00
ksymoops
mod	powerpc: Add vr save/restore functions	2014-05-30 21:52:12 -07:00
package	deb-pkg: Fix cross-building linux-headers package	2014-03-31 09:58:13 -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	X.509: Add simple ASN.1 grammar compiler	2012-10-08 13:50:19 +10:30
asn1_compiler.c	X.509: Add simple ASN.1 grammar compiler	2012-10-08 13:50:19 +10:30
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
checkkconfigsymbols.sh
checkpatch.pl	checkpatch: add Suggested-by as a standard signature	2013-04-29 18:28:20 -07:00
checkstack.pl	scripts/checkstack.pl: Add metag support	2013-03-02 20:09:55 +00:00
checksyscalls.sh	checksyscalls: fix "here document" handling	2012-09-25 08:59:21 -07:00
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: Fix patch output when coccicheck is used with M= and C=	2013-04-08 15:42:03 +02:00
config	scripts/config: fix assignment of parameters for short version of --*-after options	2013-05-20 14:15:17 +02:00
conmakehash.c
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
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	2012-10-03 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	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: use filename-only regex match for Tegra	2013-04-29 18:28:14 -07:00
gfp-translate	chmod +x scripts/gfp-translate	2012-06-27 12:44:29 -07:00
headerdep.pl
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.sh	kbuild: fix make headers_install when path is too long	2014-04-14 06:42:14 -07:00
kallsyms.c	scripts/kallsyms: filter symbols not in kernel address space	2013-11-13 12:05:32 +09:00
Kbuild.include	kbuild: fix ld-option function	2013-04-08 11:47:41 +02:00
kernel-doc	scripts/kernel-doc: handle struct member __aligned without numbers	2013-02-27 19:10:09 -08:00
Lindent
link-vmlinux.sh	scripts/kallsyms: filter symbols not in kernel address space	2013-11-13 12:05:32 +09:00
Makefile	X.509: Add simple ASN.1 grammar compiler	2012-10-08 13:50:19 +10:30
Makefile.asm-generic	uapi: Allow automatic generation of uapi/asm/ header files	2012-10-17 12:25:44 +01:00
Makefile.build	genksyms: pass symbol-prefix instead of arch	2013-03-20 11:27:27 +10:30
Makefile.clean
Makefile.fwinst	kbuild: Fix accidental revert in commit fe04ddf	2012-10-15 13:01:05 -07:00
Makefile.headersinst	kbuild: fix make headers_install when path is too long	2014-04-14 06:42:14 -07:00
Makefile.help
Makefile.host
Makefile.lib	kbuild: make sure we clean up DTB temporary files	2013-06-13 22:12:13 +01:00
Makefile.modbuiltin
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: handle huge numbers of modules.	2013-04-05 11:48:10 +10:30
Makefile.modsign	MODSIGN: Add modules_sign make target	2012-12-14 13:05:28 +10:30
makelst
markup_oops.pl
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	trivial: typo in comment in mksysmap	2012-07-20 10:36:05 +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
patch-kernel	scripts/patch-kernel: digest kernel.org hosted .xz patches	2012-03-30 15:23:36 +02:00
pnmtologo.c	scripts/pnmtologo: fix for plain PBM	2012-11-20 11:58:03 +01:00
profile2linkerlist.pl
recordmcount.c	metag: ftrace support	2013-03-02 20:09:55 +00:00
recordmcount.h	recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules	2014-07-06 18:54:13 -07:00
recordmcount.pl	ftrace/s390: mcount offset calculation	2011-05-16 15:05:06 -04:00
setlocalversion	kbuild: Unset language specific variables in setlocalversion script	2013-02-22 14:18:30 +01:00
show_delta
sign-file	MODSIGN: Add -s <signature> option to sign-file	2013-01-25 16:55:36 +10:30
sortextable.c	ARM: 7568/1: Sort exception table at compile time	2012-11-04 10:31:16 +00:00
sortextable.h	scripts/sortextable: silence script output	2013-02-14 15:04:41 +01:00
tags.sh	scripts/tags.sh: Add magic for OFFSET and DEFINE	2013-03-27 14:22:03 +01:00
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