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SubjectRe: [PATCH] udf: Annotate struct udf_bitmap with __counted_by
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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 <jack@suse.com>
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@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 {

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