[PATCH] lsm: align based on pointer length in lsm_fill_user_ctx()

[Casey Schaufler]

On 11/1/2023 6:53 PM, Paul Moore wrote:
> Using the size of a void pointer is much cleaner than
> BITS_PER_LONG / 8.
>
> Signed-off-by: Paul Moore <paul at paul-moore.com>

Acked-by: Casey Schaufler <casey at schaufler-ca.com>

> ---
>  security/security.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/security/security.c b/security/security.c
> index 86f7a1995991..a808fd5eba6d 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -792,7 +792,7 @@ int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, size_t *uctx_len,
>  	size_t nctx_len;
>  	int rc = 0;
>  
> -	nctx_len = ALIGN(struct_size(nctx, ctx, val_len), BITS_PER_LONG / 8);
> +	nctx_len = ALIGN(struct_size(nctx, ctx, val_len), sizeof(void *));
>  	if (nctx_len > *uctx_len) {
>  		rc = -E2BIG;
>  		goto out;