On Thu, 2013-10-03 at 15:47 -0700, Alexei Starovoitov wrote:
> @@ -722,7 +725,8 @@ EXPORT_SYMBOL_GPL(sk_unattached_filter_destroy);
> int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
> {
> struct sk_filter *fp, *old_fp;
> - unsigned int fsize = sizeof(struct sock_filter) * fprog->len;
> + unsigned int fsize = max(sizeof(struct sock_filter) * fprog->len,
> + sizeof(struct work_struct));
> int err;
>
> if (sock_flag(sk, SOCK_FILTER_LOCKED))
Thats broken, as we might copy more data from user than expected,
and eventually trigger EFAULT :
if (copy_from_user(fp->insns, fprog->filter, fsize)) {
--
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