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kmsan: compiler_types: declare __no_sanitize_or_inline

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It turned out that KMSAN instruments READ_ONCE_NOCHECK(), resulting in
false positive reports, because __no_sanitize_or_inline enforced inlining.

Properly declare __no_sanitize_or_inline under __SANITIZE_MEMORY__, so
that it does not __always_inline the annotated function.

Link: https://lkml.kernel.org/r/20240426091622.3846771-1-glider@google.com
Fixes: 5de0ce85f5 ("kmsan: mark noinstr as __no_sanitize_memory")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reported-by: syzbot+355c5bb8c1445c871ee8@syzkaller.appspotmail.com
Link: https://lkml.kernel.org/r/000000000000826ac1061675b0e3@google.com
Cc: <stable@vger.kernel.org>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2024-04-26 11:16:22 +02:00 committed by Andrew Morton
parent 2aaba39e78
commit 90d1f14cbb
1 changed files with 11 additions and 0 deletions
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11
include/linux/compiler_types.h
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@ -278,6 +278,17 @@ struct ftrace_likely_data {
# define __no_kcsan
#endif
#ifdef __SANITIZE_MEMORY__
/*
* Similarly to KASAN and KCSAN, KMSAN loses function attributes of inlined
* functions, therefore disabling KMSAN checks also requires disabling inlining.
*
* __no_sanitize_or_inline effectively prevents KMSAN from reporting errors
* within the function and marks all its outputs as initialized.
*/
# define __no_sanitize_or_inline __no_kmsan_checks notrace __maybe_unused
#endif
#ifndef __no_sanitize_or_inline
#define __no_sanitize_or_inline __always_inline
#endif