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authorBjörn Töpel <bjorn.topel@intel.com>2019-03-08 08:57:26 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2019-03-08 21:17:06 +0100
commitf54ba391d88f5a5d032175b4c308c176e34b80b7 (patch)
tree57ae0051fe35b78e80d592ac033bc292e863a65c /net
parentbpf, libbpf: fixing leak when kernel does not support btf (diff)
downloadlinux-dev-f54ba391d88f5a5d032175b4c308c176e34b80b7.tar.xz
linux-dev-f54ba391d88f5a5d032175b4c308c176e34b80b7.zip
xsk: fix to reject invalid flags in xsk_bind
Passing a non-existing flag in the sxdp_flags member of struct sockaddr_xdp was, incorrectly, silently ignored. This patch addresses that behavior, and rejects any non-existing flags. 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: 965a99098443 ("xsk: add support for bind for Rx") Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'net')
-rw-r--r--net/xdp/xsk.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 6697084e3fdf..a14e8864e4fa 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -407,6 +407,10 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
if (sxdp->sxdp_family != AF_XDP)
return -EINVAL;
+ flags = sxdp->sxdp_flags;
+ if (flags & ~(XDP_SHARED_UMEM | XDP_COPY | XDP_ZEROCOPY))
+ return -EINVAL;
+
mutex_lock(&xs->mutex);
if (xs->dev) {
err = -EBUSY;
@@ -425,7 +429,6 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
}
qid = sxdp->sxdp_queue_id;
- flags = sxdp->sxdp_flags;
if (flags & XDP_SHARED_UMEM) {
struct xdp_sock *umem_xs;