On 9/15/23 14:14, Kees Cook wrote:
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 udf_bitmap.
[1]
https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
Cc: Jan Kara <j...@suse.com>
Signed-off-by: Kees Cook <keesc...@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavo...@kernel.org>
Thanks
--
Gustavo
---
fs/udf/udf_sb.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index 9af6ff7f9747..f9a60bc1abcf 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -86,7 +86,7 @@ struct udf_virtual_data {
struct udf_bitmap {
__u32 s_extPosition;
int s_nr_groups;
- struct buffer_head *s_block_bitmap[];
+ struct buffer_head *s_block_bitmap[] __counted_by(s_nr_groups);
};
struct udf_part_map {
