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| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-11-21 03:14:34 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-08 07:29:41 -0800 |
| commit | ea9d7dc958579b07bf5cc419c4db932689a1224d (patch) | |
| tree | bc6ae7c9f830261d0aef659c64581c927c7009c3 | |
| parent | 18719a4c7a90af3de4bb071511dd4a6dcf61a2e0 (diff) | |
| download | lwn-ea9d7dc958579b07bf5cc419c4db932689a1224d.tar.gz lwn-ea9d7dc958579b07bf5cc419c4db932689a1224d.zip | |
net: add BUG_ON if kernel advertises msg_namelen > sizeof(struct sockaddr_storage)
[ Upstream commit 68c6beb373955da0886d8f4f5995b3922ceda4be ]
In that case it is probable that kernel code overwrote part of the
stack. So we should bail out loudly here.
The BUG_ON may be removed in future if we are sure all protocols are
conformant.
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/socket.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/socket.c b/net/socket.c index f37974014356..573e21259de2 100644 --- a/net/socket.c +++ b/net/socket.c @@ -215,12 +215,13 @@ static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen, int err; int len; + BUG_ON(klen > sizeof(struct sockaddr_storage)); err = get_user(len, ulen); if (err) return err; if (len > klen) len = klen; - if (len < 0 || len > sizeof(struct sockaddr_storage)) + if (len < 0) return -EINVAL; if (len) { if (audit_sockaddr(klen, kaddr)) |