FAILED: patch "[PATCH] tcp: add sanity tests to TCP_QUEUE_SEQ" failed to apply to 4.19-stable tree
The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8811f4a9836e31c14ecdf79d9f3cb7c5d463265d Mon Sep 17 00:00:00 2001
From: Eric Dumazet edumazet@google.com Date: Mon, 1 Mar 2021 10:29:17 -0800 Subject: [PATCH] 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: ee9952831cfd ("tcp: Initial repair mode") Signed-off-by: Eric Dumazet edumazet@google.com Cc: Pavel Emelyanov xemul@parallels.com Link: https://bugzilla.kernel.org/show_bug.cgi?id=212005 Reported-by: Qingyu Li ieatmuttonchuan@gmail.com Signed-off-by: David S. Miller davem@davemloft.net
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index dfb6f286c1de..de7cc8445ac0 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -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:
I prepared a patch series of 3, I will send it soon.
490fac7d90caa9e987eaa0b7cbbc9c94a1a0f739 (HEAD) tcp: add sanity tests to TCP_QUEUE_SEQ d767f47dde2df49a8b6b7e9199e98be0e9650d6e tcp: annotate tp->write_seq lockless reads 84a5987c38e374ea16c26cdbba9e622d86219366 tcp: annotate tp->copied_seq lockless reads 030194a5b292bb7613407668d85af0b987bb9839 (tag: v4.19.180, origin/linux-4.19.y) Linux 4.19.180
On Thu, Mar 11, 2021 at 7:22 PM gregkh@linuxfoundation.org wrote:
The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8811f4a9836e31c14ecdf79d9f3cb7c5d463265d Mon Sep 17 00:00:00 2001 From: Eric Dumazet edumazet@google.com Date: Mon, 1 Mar 2021 10:29:17 -0800 Subject: [PATCH] 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: ee9952831cfd ("tcp: Initial repair mode") Signed-off-by: Eric Dumazet edumazet@google.com Cc: Pavel Emelyanov xemul@parallels.com Link: https://bugzilla.kernel.org/show_bug.cgi?id=212005 Reported-by: Qingyu Li ieatmuttonchuan@gmail.com Signed-off-by: David S. Miller davem@davemloft.net
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index dfb6f286c1de..de7cc8445ac0 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -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;elseWRITE_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:
linux-stable-mirror@lists.linaro.org
-
Eric Dumazet -
gregkh＠linuxfoundation.org