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Andrey Ryabinin c6d308534a UBSAN: run-time undefined behavior sanity checker 
UBSAN uses compile-time instrumentation to catch undefined behavior
(UB).  Compiler inserts code that perform certain kinds of checks before
operations that could cause UB.  If check fails (i.e.  UB detected)
__ubsan_handle_* function called to print error message.

So the most of the work is done by compiler.  This patch just implements
ubsan handlers printing errors.

GCC has this capability since 4.9.x [1] (see -fsanitize=undefined
option and its suboptions).
However GCC 5.x has more checkers implemented [2].
Article [3] has a bit more details about UBSAN in the GCC.

[1] - https://gcc.gnu.org/onlinedocs/gcc-4.9.0/gcc/Debugging-Options.html
[2] - https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
[3] - http://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/

Issues which UBSAN has found thus far are:

Found bugs:

 * out-of-bounds access - 97840cb67f ("netfilter: nfnetlink: fix
   insufficient validation in nfnetlink_bind")

undefined shifts:

 * d48458d4a7 ("jbd2: use a better hash function for the revoke
   table")

 * 10632008b9 ("clockevents: Prevent shift out of bounds")

 * 'x << -1' shift in ext4 -
   http://lkml.kernel.org/r/<5444EF21.8020501@samsung.com>

 * undefined rol32(0) -
   http://lkml.kernel.org/r/<1449198241-20654-1-git-send-email-sasha.levin@oracle.com>

 * undefined dirty_ratelimit calculation -
   http://lkml.kernel.org/r/<566594E2.3050306@odin.com>

 * undefined roundown_pow_of_two(0) -
   http://lkml.kernel.org/r/<1449156616-11474-1-git-send-email-sasha.levin@oracle.com>

 * [WONTFIX] undefined shift in __bpf_prog_run -
   http://lkml.kernel.org/r/<CACT4Y+ZxoR3UjLgcNdUm4fECLMx2VdtfrENMtRRCdgHB2n0bJA@mail.gmail.com>

   WONTFIX here because it should be fixed in bpf program, not in kernel.

signed overflows:

 * 32a8df4e0b ("sched: Fix odd values in effective_load()
   calculations")

 * mul overflow in ntp -
   http://lkml.kernel.org/r/<1449175608-1146-1-git-send-email-sasha.levin@oracle.com>

 * incorrect conversion into rtc_time in rtc_time64_to_tm() -
   http://lkml.kernel.org/r/<1449187944-11730-1-git-send-email-sasha.levin@oracle.com>

 * unvalidated timespec in io_getevents() -
   http://lkml.kernel.org/r/<CACT4Y+bBxVYLQ6LtOKrKtnLthqLHcw-BMp3aqP3mjdAvr9FULQ@mail.gmail.com>

 * [NOTABUG] signed overflow in ktime_add_safe() -
   http://lkml.kernel.org/r/<CACT4Y+aJ4muRnWxsUe1CMnA6P8nooO33kwG-c8YZg=0Xc8rJqw@mail.gmail.com>

[akpm@linux-foundation.org: fix unused local warning]
[akpm@linux-foundation.org: fix __int128 build woes]
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Yury Gribov <y.gribov@samsung.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Kostya Serebryany <kcc@google.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-01-20 17:09:18 -08:00
..
alpha mm: arch: remove duplicate definitions of MADV_FREE 2016-01-20 17:09:18 -08:00
arc Kconfig: remove HAVE_LATENCYTOP_SUPPORT 2016-01-16 11:17:23 -08:00
arm virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
arm64 virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
avr32 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/egtvedt/linux-avr32 2016-01-18 12:50:55 -08:00
blackfin virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
c6x Merge branch 'for-linux-next' of git://linux-c6x.org/git/projects/linux-c6x-upstreaming 2016-01-12 13:00:16 -08:00
cris cris: nand: remove useless mtd->priv = chip assignments 2015-12-18 13:22:11 -08:00
frv arch/frv/include/asm/io.h: accept const void pointers for read{b,w,l}() 2016-01-20 17:09:18 -08:00
h8300 h8300: Rename ctlr_out/in[bwl] to raw_read/write[bwl] 2015-12-15 10:12:03 +01:00
hexagon
ia64 virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
m32r m32r: fix m32104ut_defconfig build fail 2016-01-14 16:00:49 -08:00
m68k Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2016-01-12 17:11:47 -08:00
metag virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
microblaze Kconfig: remove HAVE_LATENCYTOP_SUPPORT 2016-01-16 11:17:23 -08:00
mips mm: arch: remove duplicate definitions of MADV_FREE 2016-01-20 17:09:18 -08:00
mn10300 libnvdimm, pfn, pmem: allocate memmap array in persistent memory 2016-01-15 17:56:32 -08:00
nios2 nios2: fix cache coherency 2015-11-26 22:25:58 +08:00
openrisc
parisc mm: arch: remove duplicate definitions of MADV_FREE 2016-01-20 17:09:18 -08:00
powerpc powerpc/fadump: rename cpu_online_mask member of struct fadump_crash_info_header 2016-01-20 17:09:18 -08:00
s390 virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
score
sh virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
sparc virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
tile virtio: barrier rework+fixes 2016-01-18 16:44:24 -08:00
um um: kill pfn_t 2016-01-15 17:56:32 -08:00
unicore32 Kconfig: remove HAVE_LATENCYTOP_SUPPORT 2016-01-16 11:17:23 -08:00
x86 UBSAN: run-time undefined behavior sanity checker 2016-01-20 17:09:18 -08:00
xtensa mm: arch: remove duplicate definitions of MADV_FREE 2016-01-20 17:09:18 -08:00
.gitignore
Kconfig mm: mmap: add new /proc tunable for mmap_base ASLR 2016-01-14 16:00:49 -08:00