From c57b557b644da624982c36b74f608cdb7b902868 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Date: Fri, 8 Mar 2019 08:57:27 +0100 Subject: [PATCH] xsk: fix to reject invalid options in Tx descriptor MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Passing a non-existing option in the options member of struct xdp_desc was, incorrectly, silently ignored. This patch addresses that behavior, and drops any Tx descriptor with non-existing options. We have examined existing user space code, and to our best knowledge, no one is relying on the current incorrect behavior. AF_XDP is still in its infancy, so from our perspective, the risk of breakage is very low, and addressing this problem now is important. Fixes: 35fcde7f8deb ("xsk: support for Tx") Signed-off-by: Björn Töpel Signed-off-by: Daniel Borkmann --- net/xdp/xsk_queue.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index bcb5cbb40419..610c0bdc0c2b 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -174,8 +174,8 @@ static inline bool xskq_is_valid_desc(struct xsk_queue *q, struct xdp_desc *d) if (!xskq_is_valid_addr(q, d->addr)) return false; - if (((d->addr + d->len) & q->chunk_mask) != - (d->addr & q->chunk_mask)) { + if (((d->addr + d->len) & q->chunk_mask) != (d->addr & q->chunk_mask) || + d->options) { q->invalid_descs++; return false; }