Re: [PATCH] fs/select: Annotate struct poll_list with __counted_by()

["Gustavo A. R. Silva" <gustavo@xxxxxxxxxxxxxx>]

On 08/08/24 09:00, Thorsten Blum wrote:
> Add the __counted_by compiler attribute to the flexible array member
> entries to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
> CONFIG_FORTIFY_SOURCE.
>
> Signed-off-by: Thorsten Blum <thorsten.blum@xxxxxxxxxx>

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

Thanks
--
Gustavo

> ---
>   fs/select.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/select.c b/fs/select.c
> index 9515c3fa1a03..1a4849e2afb9 100644
> --- a/fs/select.c
> +++ b/fs/select.c
> @@ -840,7 +840,7 @@ SYSCALL_DEFINE1(old_select, struct sel_arg_struct __user *, arg)
>   struct poll_list {
>   	struct poll_list *next;
>   	unsigned int len;
> -	struct pollfd entries[];
> +	struct pollfd entries[] __counted_by(len);
>   };
>   
>   #define POLLFD_PER_PAGE  ((PAGE_SIZE-sizeof(struct poll_list)) / sizeof(struct pollfd))