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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2015-12-16 23:39:04 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-22 20:55:48 -0800 |
| commit | 45076a809b04108a8af7a6d55cf7e4d48ae9e43b (patch) | |
| tree | 5ef97b108a1d0e0aef1f3a2fee7b009c4b8cf556 | |
| parent | faaf14faa7cd26ea5b58212ae5308864c9dd3153 (diff) | |
| download | lwn-45076a809b04108a8af7a6d55cf7e4d48ae9e43b.tar.gz lwn-45076a809b04108a8af7a6d55cf7e4d48ae9e43b.zip | |
net: check both type and procotol for tcp sockets
[ Upstream commit ac5cc977991d2dce85fc734a6c71ddb33f6fe3c1 ]
Dmitry reported the following out-of-bound access:
Call Trace:
[<ffffffff816cec2e>] __asan_report_load4_noabort+0x3e/0x40
mm/kasan/report.c:294
[<ffffffff84affb14>] sock_setsockopt+0x1284/0x13d0 net/core/sock.c:880
[< inline >] SYSC_setsockopt net/socket.c:1746
[<ffffffff84aed7ee>] SyS_setsockopt+0x1fe/0x240 net/socket.c:1729
[<ffffffff85c18c76>] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
This is because we mistake a raw socket as a tcp socket.
We should check both sk->sk_type and sk->sk_protocol to ensure
it is a tcp socket.
Willem points out __skb_complete_tx_timestamp() needs to fix as well.
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/core/skbuff.c | 3 | ||||
| -rw-r--r-- | net/core/sock.c | 3 |
2 files changed, 4 insertions, 2 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 1883d28784ca..1c1f87ca447c 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3643,7 +3643,8 @@ static void __skb_complete_tx_timestamp(struct sk_buff *skb, serr->ee.ee_info = tstype; if (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) { serr->ee.ee_data = skb_shinfo(skb)->tskey; - if (sk->sk_protocol == IPPROTO_TCP) + if (sk->sk_protocol == IPPROTO_TCP && + sk->sk_type == SOCK_STREAM) serr->ee.ee_data -= sk->sk_tskey; } diff --git a/net/core/sock.c b/net/core/sock.c index d7a7fc56c56d..dbbda999f33c 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -860,7 +860,8 @@ set_rcvbuf: if (val & SOF_TIMESTAMPING_OPT_ID && !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { - if (sk->sk_protocol == IPPROTO_TCP) { + if (sk->sk_protocol == IPPROTO_TCP && + sk->sk_type == SOCK_STREAM) { if (sk->sk_state != TCP_ESTABLISHED) { ret = -EINVAL; break; |