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dm: Annotate struct dm_bio_prison with __counted_by 

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct dm_bio_prison.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Alasdair Kergon <agk@redhat.com>
Cc: Mike Snitzer <snitzer@kernel.org>
Cc: dm-devel@redhat.com
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20230915200407.never.611-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2023-09-15 13:04:08 -07:00
parent 37d27cf1f5
commit 96d7c65939
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-bio-prison-v1.c
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@ -26,7 +26,7 @@ struct prison_region {
struct dm_bio_prison {
mempool_t cell_pool;
unsigned int num_locks;
struct prison_region regions[];
struct prison_region regions[] __counted_by(num_locks);
};
static struct kmem_cache *_cell_cache;