diff options
| author | Alexander Potapenko <glider@google.com> | 2024-03-20 13:18:49 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-04-26 07:07:02 +0300 |
| commit | 3429055f0451cd3a281f8ed6691335ead626b136 (patch) | |
| tree | b9129ba3f2198b5a4c53fe7bf724c4b61d6354db /mm/kmsan | |
| parent | 212f863fa8811c780abacc1d0404c573fdc0a2de (diff) | |
| download | linux-3429055f0451cd3a281f8ed6691335ead626b136.tar.xz | |
mm: kmsan: implement kmsan_memmove()
Provide a hook that can be used by custom memcpy implementations to tell
KMSAN that the metadata needs to be copied. Without that, false positive
reports are possible in the cases where KMSAN fails to intercept memory
initialization.
Link: https://lore.kernel.org/all/3b7dbd88-0861-4638-b2d2-911c97a4cadf@I-love.SAKURA.ne.jp/
Link: https://lkml.kernel.org/r/20240320101851.2589698-1-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kmsan')
| -rw-r--r-- | mm/kmsan/hooks.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/kmsan/hooks.c b/mm/kmsan/hooks.c index 0b09daa188ef..22e8657800ef 100644 --- a/mm/kmsan/hooks.c +++ b/mm/kmsan/hooks.c @@ -285,6 +285,17 @@ void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy, } EXPORT_SYMBOL(kmsan_copy_to_user); +void kmsan_memmove(void *to, const void *from, size_t size) +{ + if (!kmsan_enabled || kmsan_in_runtime()) + return; + + kmsan_enter_runtime(); + kmsan_internal_memmove_metadata(to, (void *)from, size); + kmsan_leave_runtime(); +} +EXPORT_SYMBOL(kmsan_memmove); + /* Helper function to check an URB. */ void kmsan_handle_urb(const struct urb *urb, bool is_out) { |