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SubjectRe: [PATCH] ceph: Annotate struct ceph_osd_request with __counted_by
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On 9/15/23 14:15, 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 ceph_osd_request.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Ilya Dryomov <idryomov@gmail.com>
> Cc: Xiubo Li <xiubli@redhat.com>
> Cc: Jeff Layton <jlayton@kernel.org>
> Cc: ceph-devel@vger.kernel.org
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
--
Gustavo

> ---
> include/linux/ceph/osd_client.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
> index bf9823956758..b8610e9d2471 100644
> --- a/include/linux/ceph/osd_client.h
> +++ b/include/linux/ceph/osd_client.h
> @@ -278,7 +278,7 @@ struct ceph_osd_request {
> int r_attempts;
> u32 r_map_dne_bound;
>
> - struct ceph_osd_req_op r_ops[];
> + struct ceph_osd_req_op r_ops[] __counted_by(r_num_ops);
> };
>
> struct ceph_request_redirect {

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