[lvc-project] [PATCH 4.19 5.4 5.10 5.15] net: relax socket state check at accept time.

[Eric Dumazet]

On Thu, Jul 25, 2024 at 11:15 AM Nikolay Kuratov <kniv at yandex-team.ru> wrote:
>
> [ Upstream commit 26afda78cda3da974fd4c287962c169e9462c495 ]
>
> Christoph reported the following splat:
>
> WARNING: CPU: 1 PID: 772 at net/ipv4/af_inet.c:761 __inet_accept+0x1f4/0x4a0
> Modules linked in:
> CPU: 1 PID: 772 Comm: syz-executor510 Not tainted 6.9.0-rc7-g7da7119fe22b #56
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014
> RIP: 0010:__inet_accept+0x1f4/0x4a0 net/ipv4/af_inet.c:759
> Code: 04 38 84 c0 0f 85 87 00 00 00 41 c7 04 24 03 00 00 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 ec b7 da fd <0f> 0b e9 7f fe ff ff e8 e0 b7 da fd 0f 0b e9 fe fe ff ff 89 d9 80
> RSP: 0018:ffffc90000c2fc58 EFLAGS: 00010293
> RAX: ffffffff836bdd14 RBX: 0000000000000000 RCX: ffff888104668000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: dffffc0000000000 R08: ffffffff836bdb89 R09: fffff52000185f64
> R10: dffffc0000000000 R11: fffff52000185f64 R12: dffffc0000000000
> R13: 1ffff92000185f98 R14: ffff88810754d880 R15: ffff8881007b7800
> FS:  000000001c772880(0000) GS:ffff88811b280000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fb9fcf2e178 CR3: 00000001045d2002 CR4: 0000000000770ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> PKRU: 55555554
> Call Trace:
>  <TASK>
>  inet_accept+0x138/0x1d0 net/ipv4/af_inet.c:786
>  do_accept+0x435/0x620 net/socket.c:1929
>  __sys_accept4_file net/socket.c:1969 [inline]
>  __sys_accept4+0x9b/0x110 net/socket.c:1999
>  __do_sys_accept net/socket.c:2016 [inline]
>  __se_sys_accept net/socket.c:2013 [inline]
>  __x64_sys_accept+0x7d/0x90 net/socket.c:2013
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0x58/0x100 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> RIP: 0033:0x4315f9
> Code: fd ff 48 81 c4 80 00 00 00 e9 f1 fe ff ff 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 ab b4 fd ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffdb26d9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
> RAX: ffffffffffffffda RBX: 0000000000400300 RCX: 00000000004315f9
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
> RBP: 00000000006e1018 R08: 0000000000400300 R09: 0000000000400300
> R10: 0000000000400300 R11: 0000000000000246 R12: 0000000000000000
> R13: 000000000040cdf0 R14: 000000000040ce80 R15: 0000000000000055
>  </TASK>
>
> The reproducer invokes shutdown() before entering the listener status.
> After commit 94062790aedb ("tcp: defer shutdown(SEND_SHUTDOWN) for
> TCP_SYN_RECV sockets"), the above causes the child to reach the accept
> syscall in FIN_WAIT1 status.
>
> Eric noted we can relax the existing assertion in __inet_accept()
>
> Reported-by: Christoph Paasch <cpaasch at apple.com>
> Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/490
> Suggested-by: Eric Dumazet <edumazet at google.com>
> Fixes: 94062790aedb ("tcp: defer shutdown(SEND_SHUTDOWN) for TCP_SYN_RECV sockets")
> Link: https://lore.kernel.org/r/23ab880a44d8cfd967e84de8b93dbf48848e3d8c.1716299669.git.pabeni@redhat.com
> Link: https://lore.kernel.org/linux-cve-announce/2024062136-CVE-2024-36484-375b@gregkh

Missing the original author ?

Signed-off-by: Paolo Abeni <pabeni at redhat.com>

> Signed-off-by: Nikolay Kuratov <kniv at yandex-team.ru>
> ---
>  net/ipv4/af_inet.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
> index 475a19db3713..ce42626663de 100644
> --- a/net/ipv4/af_inet.c
> +++ b/net/ipv4/af_inet.c
> @@ -758,7 +758,9 @@ int inet_accept(struct socket *sock, struct socket *newsock, int flags,
>         sock_rps_record_flow(sk2);
>         WARN_ON(!((1 << sk2->sk_state) &
>                   (TCPF_ESTABLISHED | TCPF_SYN_RECV |
> -                 TCPF_CLOSE_WAIT | TCPF_CLOSE)));
> +                  TCPF_FIN_WAIT1 | TCPF_FIN_WAIT2 |
> +                  TCPF_CLOSING | TCPF_CLOSE_WAIT |
> +                  TCPF_CLOSE)));
>
>         sock_graft(sk2, newsock);
>
> --
> 2.34.1
>