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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
..
.gitignore x86, realmode: realmode.bin infrastructure 2012-05-08 11:41:48 -07:00
bioscall.S x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
copy.S x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
header.S x86-64, reboot: Allow reboot=bios and reboot-cpu override on x86-64 2012-06-17 10:51:01 -07:00
Makefile UBSAN: run-time undefined behavior sanity checker 2016-01-20 17:09:18 -08:00
realmode.h x86, realmode: Move end signature into header.S 2012-05-21 00:02:45 -07:00
realmode.lds.S x86, realmode: don't copy real_mode_header 2012-05-08 11:48:45 -07:00
reboot.S x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
regs.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
stack.S x86, realmode: fix 64-bit wakeup sequence 2012-05-08 11:48:11 -07:00
trampoline_32.S x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
trampoline_64.S x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
trampoline_common.S x86, realmode: Move not-common bits out of trampoline_common.S 2012-05-16 13:44:10 -07:00
video-bios.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
video-mode.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
video-vesa.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
video-vga.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
wakemain.c x86, realmode: flattened rm hierachy 2012-05-08 11:48:45 -07:00
wakeup_asm.S x86, suspend: Correct the restore of CR4, EFER; skip computing EFLAGS.ID 2012-10-02 08:42:31 +02:00
wakeup.h x86, suspend: On wakeup always initialize cr4 and EFER 2012-09-26 15:06:22 -07:00