https://github.com/torvalds/linux
Revision d976441f44bc5d48635d081d277aa76556ffbf8b authored by Andrey Ryabinin on 19 October 2015, 08:37:17 UTC, committed by Ingo Molnar on 20 October 2015, 09:04:19 UTC
Some code may perform racy by design memory reads. This could be harmless, yet such code may produce KASAN warnings. To hide such accesses from KASAN this patch introduces READ_ONCE_NOCHECK() macro. KASAN will not check the memory accessed by READ_ONCE_NOCHECK(). The KernelThreadSanitizer (KTSAN) is going to ignore it as well. This patch creates __read_once_size_nocheck() a clone of __read_once_size(). The only difference between them is 'no_sanitized_address' attribute appended to '*_nocheck' function. This attribute tells the compiler that instrumentation of memory accesses should not be applied to that function. We declare it as static '__maybe_unsed' because GCC is not capable to inline such function: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368 With KASAN=n READ_ONCE_NOCHECK() is just a clone of READ_ONCE(). Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Kostya Serebryany <kcc@google.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wolfram Gloger <wmglo@dent.med.uni-muenchen.de> Cc: kasan-dev <kasan-dev@googlegroups.com> Link: http://lkml.kernel.org/r/1445243838-17763-2-git-send-email-aryabinin@virtuozzo.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Tip revision: d976441f44bc5d48635d081d277aa76556ffbf8b authored by Andrey Ryabinin on 19 October 2015, 08:37:17 UTC
compiler, atomics, kasan: Provide READ_ONCE_NOCHECK()
compiler, atomics, kasan: Provide READ_ONCE_NOCHECK()
Tip revision: d976441
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arch | ||
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certs | ||
crypto | ||
drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
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.get_maintainer.ignore | -rw-r--r-- | 31 bytes |
.gitignore | -rw-r--r-- | 1.2 KB |
.mailmap | -rw-r--r-- | 5.3 KB |
COPYING | -rw-r--r-- | 18.3 KB |
CREDITS | -rw-r--r-- | 94.9 KB |
Kbuild | -rw-r--r-- | 2.6 KB |
Kconfig | -rw-r--r-- | 252 bytes |
MAINTAINERS | -rw-r--r-- | 319.7 KB |
Makefile | -rw-r--r-- | 53.2 KB |
README | -rw-r--r-- | 18.2 KB |
REPORTING-BUGS | -rw-r--r-- | 7.3 KB |
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