[dm-devel] [PATCH] dm: Annotate struct dm_stat with __counted_by
Kees Cook
keescook at chromium.org
Fri Sep 15 20:04:01 UTC 2023
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 <agk at redhat.com>
Cc: Mike Snitzer <snitzer at kernel.org>
Cc: dm-devel at redhat.com
Signed-off-by: Kees Cook <keescook at chromium.org>
---
drivers/md/dm-stats.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index db2d997a6c18..bdc14ec99814 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
--
2.34.1
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