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Andrey Konovalov dcb852a7db kasan: don't emit builtin calls when sanitization is off 
commit 0e410e158e5baa1300bdf678cea4f4e0cf9d8b94 upstream.

With KASAN enabled the kernel has two different memset() functions, one
with KASAN checks (memset) and one without (__memset).  KASAN uses some
macro tricks to use the proper version where required.  For example
memset() calls in mm/slub.c are without KASAN checks, since they operate
on poisoned slab object metadata.

The issue is that clang emits memset() calls even when there is no
memset() in the source code.  They get linked with improper memset()
implementation and the kernel fails to boot due to a huge amount of KASAN
reports during early boot stages.

The solution is to add -fno-builtin flag for files with KASAN_SANITIZE :=
n marker.

Link: http://lkml.kernel.org/r/8ffecfffe04088c52c42b92739c2bd8a0bcb3f5e.1516384594.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[ Nick : Backported to 4.4 avoiding KUBSAN ]
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-08-17 20:56:44 +02:00
..
basic kbuild: fixdep: drop meaningless hash table initialization 2015-08-24 16:36:08 +02:00
coccinelle scripts/coccinelle: modernize & 2016-04-12 09:09:00 -07:00
dtc scripts/dtc: Update to upstream version 9d3649bd3be245c9 2015-04-29 17:17:27 -05:00
gdb scripts/gdb: remove useless global instruction 2015-06-30 19:44:58 -07:00
genksyms genksyms: Fix segfault with invalid declarations 2018-02-25 11:03:51 +01:00
kconfig kconfig: Avoid format overflow warning from GCC 8.1 2018-06-13 16:15:27 +02:00
ksymoops Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mod module/retpoline: Warn about missing retpoline in module 2018-02-25 11:03:52 +01:00
package kbuild: pkg: use --transform option to prefix paths in tar 2017-12-16 10:33:54 +01:00
selinux selinux: explicitly declare the role "base_r" 2015-07-13 13:32:00 -04:00
tracing kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
.gitignore DocBook: Use a fixed encoding for output 2015-09-28 01:31:48 -06:00
analyze_suspend.py
asn1_compiler.c ASN.1: Copy string names to tokens in ASN.1 compiler 2015-08-07 16:26:13 +01:00
bloat-o-meter scripts/bloat-o-meter: fix python3 syntax error 2016-02-25 12:01:22 -08:00
bootgraph.pl kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
check-lc_ctype.c DocBook: Use a fixed encoding for output 2015-09-28 01:31:48 -06:00
check_extable.sh scripts: add check_extable.sh script. 2015-04-13 21:03:02 +09:30
checkincludes.pl checkincludes: fix perlcritic warnings 2010-03-07 21:19:57 +01:00
checkkconfigsymbols.py
checkpatch.pl checkpatch: silence perl 5.26.0 unescaped left brace warnings 2017-07-21 07:44:57 +02:00
checkstack.pl Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2014-10-07 21:16:26 -04:00
checksyscalls.sh x86/asm/entry: Move the arch/x86/syscalls/ definitions to arch/x86/entry/syscalls/ 2015-06-04 07:37:37 +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 scripts: Make cleanfile/cleanpatch warn about long lines 2007-07-16 21:15:50 +02:00
cleanpatch scripts: Make cleanfile/cleanpatch warn about long lines 2007-07-16 21:15:50 +02:00
coccicheck Coccinelle: fix incorrect -include option transformation 2015-10-26 21:32:09 +01:00
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 scripts: decode_stacktrace: fix ARM architecture decoding 2015-09-04 16:54:41 -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 vfs,ext2: remove CONFIG_EXT2_FS_XIP and rename CONFIG_FS_XIP to CONFIG_FS_DAX 2015-02-16 17:56:04 -08:00
docproc.c kbuild: trivial - use tabs for code indent where possible 2014-06-10 14:00:53 +02:00
export_report.pl kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
extract-cert.c KEYS: Remove unnecessary header #inclusions from extract-cert.c 2015-09-25 16:31:45 +01:00
extract-ikconfig scripts/extract-ikconfig: Support LZ4-compressed images. 2015-04-15 14:01:12 +02:00
extract-module-sig.pl KEYS: Provide a script to extract a module signature 2015-10-21 15:18:36 +01:00
extract-sys-certs.pl KEYS: Provide a script to extract the sys cert list from a vmlinux file 2015-10-21 15:18:36 +01:00
extract-vmlinux scripts: add extract-vmlinux 2011-08-31 16:12:17 +02:00
gcc-goto.sh kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
gcc-ld kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
gcc-version.sh kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
gcc-x86_32-has-stack-protector.sh kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
gcc-x86_64-has-stack-protector.sh scripts/has-stack-protector: add -fno-PIE 2016-11-26 09:54:52 +01:00
gen_initramfs_list.sh kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
get_maintainer.pl get_maintainer: add subsystem to reviewer output 2015-11-06 17:50:42 -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 CRIS: Fix headers_install 2014-12-20 00:01:12 +01:00
headers_check.pl kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
headers_install.sh Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2014-10-14 09:22:26 +02:00
kallsyms.c Kbuild: kallsyms: drop special handling of pre-3.0 GCC symbols 2015-04-07 13:04:51 +02:00
Kbuild.include Kbuild: fix # escaping in .cmd files for future Make 2018-07-19 15:35:57 +02:00
kernel-doc scripts/kernel-doc: Don't fail with status != 0 if error encountered with -none 2018-02-25 11:03:39 +01:00
kernel-doc-xml-ref scripts/kernel-doc: Adding cross-reference links to html documentation. 2015-08-16 22:11:16 -06:00
ld-version.sh ld-version: Fix awk regex compile failure 2016-03-16 08:43:01 -07:00
Lindent scripts/Lindent: handle missing indent gracefully 2015-09-04 16:54:41 -07:00
link-vmlinux.sh um: link with -lpthread 2016-03-03 15:07:12 -08:00
Makefile DocBook: Use a fixed encoding for output 2015-09-28 01:31:48 -06:00
Makefile.asm-generic kbuild: trivial - remove trailing empty lines 2014-06-10 00:04:06 +02:00
Makefile.build kbuild: modversions for EXPORT_SYMBOL() for asm 2018-01-23 19:50:17 +01:00
Makefile.clean Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2015-02-19 10:07:08 -08:00
Makefile.dtbinst kbuild: include $(src)/Makefile rather than $(obj)/Makefile 2015-04-02 16:42:08 +02:00
Makefile.extrawarn kbuild: move -Wunused-const-variable to W=1 warning level 2016-06-01 12:15:54 -07:00
Makefile.fwinst kbuild: include $(src)/Makefile rather than $(obj)/Makefile 2015-04-02 16:42:08 +02:00
Makefile.headersinst kbuild: collect shorthands into scripts/Kbuild.include 2014-11-26 14:36:52 +01:00
Makefile.help Add a target to use the Coccinelle checker 2010-06-12 00:00:29 +02:00
Makefile.host kbuild: handle the dependency of multi-objs hostprogs appropriately 2014-08-19 10:26:20 +02:00
Makefile.kasan kasan: don't emit builtin calls when sanitization is off 2018-08-17 20:56:44 +02:00
Makefile.lib kasan: don't emit builtin calls when sanitization is off 2018-08-17 20:56:44 +02:00
Makefile.modbuiltin kbuild: Create output directory in Makefile.modbuiltin 2010-06-10 12:23:08 +02:00
Makefile.modinst modsign: Abort modules_install when signing fails 2015-08-07 16:26:13 +01:00
Makefile.modpost modpost: Add flag -E for making section mismatches fatal 2015-10-06 10:46:21 +10:30
Makefile.modsign modsign: lookup lines ending in .ko in .mod files 2014-08-27 21:54:11 +09:30
makelst kbuild: introduce ccflags-y, asflags-y and ldflags-y 2007-10-15 22:25:06 +02:00
markup_oops.pl kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
mkcompile_h kbuild: trivial - remove trailing spaces 2014-04-30 17:34:32 +02:00
mkmakefile kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
mksysmap mksysmap: Add h8300 local symbol pattern 2015-06-23 13:35:47 +09:00
mkuboot.sh mkuboot.sh: Fail if mkimage is missing 2011-01-07 14:31:01 +01:00
mkversion Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
module-common.lds module: set __jump_table alignment to 8 2017-12-16 10:33:51 +01:00
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 kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00
recordmcount.c ftrace/recordmcount: Work around for addition of metag magic but not relocations 2016-08-20 18:09:23 +02:00
recordmcount.h recordmcount: Fix endianness handling bug for nop_mcount 2015-11-03 10:45:26 -05:00
recordmcount.pl scripts/recordmcount.pl: support data in text section on powerpc 2016-01-31 11:29:03 -08:00
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.c MODSIGN: Change from CMS to PKCS#7 signing if the openssl is too old 2015-09-25 16:31:46 +01:00
sortextable.c Revert "x86/mm: Expand the exception table logic to allow new handling options" 2016-10-31 19:56:26 -06:00
sortextable.h scripts/sortextable: suppress warning: `relocs_size' may be used uninitialized 2014-10-14 02:18:23 +02:00
spelling.txt
stackdelta scripts: add stackdelta script 2015-08-28 17:04:40 +02:00
stackusage scripts: add stackusage script 2015-08-28 17:04:40 +02:00
tags.sh tags: honor COMPILED_SOURCE with apart output directory 2018-04-13 19:50:18 +02:00
unifdef.c unifdef: update to upstream version 2.5 2011-01-22 15:50:59 +01:00
ver_linux ver_linux: proc/modules, limit text processing to 'sed' 2015-10-17 21:55:26 -07:00
xen-hypercalls.sh xen: build infrastructure for generating hypercall depending symbols 2015-03-16 14:49:13 +00:00
xz_wrap.sh kbuild: Make scripts executable 2014-08-20 16:03:45 +02:00