CVE-2024-36484

In the Linux kernel, the following vulnerability has been resolved:

net: relax socket state check at accept time.

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()