Commit 8811f4a9 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller

tcp: add sanity tests to TCP_QUEUE_SEQ

Qingyu Li reported a syzkaller bug where the repro
changes RCV SEQ _after_ restoring data in the receive queue.

mprotect(0x4aa000, 12288, PROT_READ)    = 0
mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000
mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000
mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000
socket(AF_INET6, SOCK_STREAM, IPPROTO_IP) = 3
setsockopt(3, SOL_TCP, TCP_REPAIR, [1], 4) = 0
connect(3, {sa_family=AF_INET6, sin6_port=htons(0), sin6_flowinfo=htonl(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_scope_id=0}, 28) = 0
setsockopt(3, SOL_TCP, TCP_REPAIR_QUEUE, [1], 4) = 0
sendmsg(3, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="0x0000000000000003\0\0", iov_len=20}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 20
setsockopt(3, SOL_TCP, TCP_REPAIR, [0], 4) = 0
setsockopt(3, SOL_TCP, TCP_QUEUE_SEQ, [128], 4) = 0
recvfrom(3, NULL, 20, 0, NULL, NULL)    = -1 ECONNRESET (Connection reset by peer)

syslog shows:
[  111.205099] TCP recvmsg seq # bug 2: copied 80, seq 0, rcvnxt 80, fl 0
[  111.207894] WARNING: CPU: 1 PID: 356 at net/ipv4/tcp.c:2343 tcp_recvmsg_locked+0x90e/0x29a0

This should not be allowed. TCP_QUEUE_SEQ should only be used
when queues are empty.

This patch fixes this case, and the tx path as well.

Fixes: ee995283 ("tcp: Initial repair mode")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=212005Reported-by: default avatarQingyu Li <ieatmuttonchuan@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3946688e
......@@ -3469,16 +3469,23 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
break;
case TCP_QUEUE_SEQ:
if (sk->sk_state != TCP_CLOSE)
if (sk->sk_state != TCP_CLOSE) {
err = -EPERM;
else if (tp->repair_queue == TCP_SEND_QUEUE)
WRITE_ONCE(tp->write_seq, val);
else if (tp->repair_queue == TCP_RECV_QUEUE) {
WRITE_ONCE(tp->rcv_nxt, val);
WRITE_ONCE(tp->copied_seq, val);
}
else
} else if (tp->repair_queue == TCP_SEND_QUEUE) {
if (!tcp_rtx_queue_empty(sk))
err = -EPERM;
else
WRITE_ONCE(tp->write_seq, val);
} else if (tp->repair_queue == TCP_RECV_QUEUE) {
if (tp->rcv_nxt != tp->copied_seq) {
err = -EPERM;
} else {
WRITE_ONCE(tp->rcv_nxt, val);
WRITE_ONCE(tp->copied_seq, val);
}
} else {
err = -EINVAL;
}
break;
case TCP_REPAIR_OPTIONS:
......
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