diff options
| author | Alexander Potapenko <glider@google.com> | 2025-05-07 18:00:11 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-05-21 09:55:16 -0700 |
| commit | e17c1f15b0ccfa4802cedbd464d00ece50a10cf1 (patch) | |
| tree | 350fa7a9c93670309b881cd191a50a4f17b19b03 /mm | |
| parent | ce6a1c978f9c2beb38dbb1793799614255094290 (diff) | |
kmsan: enter the runtime around kmsan_internal_memmove_metadata() call
kmsan_internal_memmove_metadata() transitively calls stack_depot_save()
(via kmsan_internal_chain_origin() and kmsan_save_stack_with_flags()),
which may allocate memory. Guard it with kmsan_enter_runtime() and
kmsan_leave_runtime() to avoid recursion.
This bug was spotted by CONFIG_WARN_CAPABILITY_ANALYSIS=y
Link: https://lkml.kernel.org/r/20250507160012.3311104-4-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/kmsan/hooks.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/kmsan/hooks.c b/mm/kmsan/hooks.c index 05f2faa54054..97de3d6194f0 100644 --- a/mm/kmsan/hooks.c +++ b/mm/kmsan/hooks.c @@ -275,8 +275,10 @@ void kmsan_copy_to_user(void __user *to, const void *from, size_t to_copy, * Don't check anything, just copy the shadow of the copied * bytes. */ + kmsan_enter_runtime(); kmsan_internal_memmove_metadata((void *)to, (void *)from, to_copy - left); + kmsan_leave_runtime(); } user_access_restore(ua_flags); } |