From: Kees Cook Date: Fri, 15 Sep 2023 20:04:01 +0000 (-0700) Subject: dm: Annotate struct dm_stat with __counted_by X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=37d27cf1f5836a5f889e66bee755254d4a1faf72;p=linux.git dm: Annotate struct dm_stat 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_stat. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Alasdair Kergon Cc: Mike Snitzer Cc: dm-devel@redhat.com Reviewed-by: "Gustavo A. R. Silva" Link: https://lore.kernel.org/r/20230915200400.never.585-kees@kernel.org Signed-off-by: Kees Cook --- diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c index db2d997a6c181..bdc14ec998141 100644 --- a/drivers/md/dm-stats.c +++ b/drivers/md/dm-stats.c @@ -56,7 +56,7 @@ struct dm_stat { size_t percpu_alloc_size; size_t histogram_alloc_size; struct dm_stat_percpu *stat_percpu[NR_CPUS]; - struct dm_stat_shared stat_shared[]; + struct dm_stat_shared stat_shared[] __counted_by(n_entries); }; #define STAT_PRECISE_TIMESTAMPS 1