[PATCH] afs: Annotate struct afs_permits with __counted_by
Gustavo A. R. Silva
gustavo at embeddedor.com
Fri Sep 15 13:51:01 PDT 2023
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 afs_permits.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: David Howells <dhowells at redhat.com>
> Cc: Marc Dionne <marc.dionne at auristor.com>
> Cc: linux-afs at lists.infradead.org
> Signed-off-by: Kees Cook <keescook at chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars at kernel.org>
Thanks
--
Gustavo
> ---
> fs/afs/internal.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/afs/internal.h b/fs/afs/internal.h
> index 07433a5349ca..469a717467a4 100644
> --- a/fs/afs/internal.h
> +++ b/fs/afs/internal.h
> @@ -705,7 +705,7 @@ struct afs_permits {
> refcount_t usage;
> unsigned short nr_permits; /* Number of records */
> bool invalidated; /* Invalidated due to key change */
> - struct afs_permit permits[]; /* List of permits sorted by key pointer */
> + struct afs_permit permits[] __counted_by(nr_permits); /* List of permits sorted by key pointer */
> };
>
> /*
More information about the linux-afs
mailing list