Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.4 12/32] net: add BUG_ON if kernel advertises msg_namelen > sizeof(struct sockaddr_storage) | Date | Fri, 6 Dec 2013 13:52:22 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Hannes Frederic Sowa <hannes@stressinduktion.org>
[ 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> --- net/socket.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/socket.c +++ b/net/socket.c @@ -215,12 +215,13 @@ static int move_addr_to_user(struct sock 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))
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