RE: [PATCH bpf] bpf, sockmap: fix an infinite loop error when len is 0 in tcp_bpf_recvmsg_parser()

[John Fastabend <john.fastabend@gmail.com>]

Liu Jian wrote:
> When the buffer length of the recvmsg system call is 0, we got the
> flollowing soft lockup problem:
> 
> watchdog: BUG: soft lockup - CPU#3 stuck for 27s! [a.out:6149]
> CPU: 3 PID: 6149 Comm: a.out Kdump: loaded Not tainted 6.2.0+ #30
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
> RIP: 0010:remove_wait_queue+0xb/0xc0
> Code: 5e 41 5f c3 cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 57 <41> 56 41 55 41 54 55 48 89 fd 53 48 89 f3 4c 8d 6b 18 4c 8d 73 20
> RSP: 0018:ffff88811b5978b8 EFLAGS: 00000246
> RAX: 0000000000000000 RBX: ffff88811a7d3780 RCX: ffffffffb7a4d768
> RDX: dffffc0000000000 RSI: ffff88811b597908 RDI: ffff888115408040
> RBP: 1ffff110236b2f1b R08: 0000000000000000 R09: ffff88811a7d37e7
> R10: ffffed10234fa6fc R11: 0000000000000001 R12: ffff88811179b800
> R13: 0000000000000001 R14: ffff88811a7d38a8 R15: ffff88811a7d37e0
> FS:  00007f6fb5398740(0000) GS:ffff888237180000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000000 CR3: 000000010b6ba002 CR4: 0000000000370ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  tcp_msg_wait_data+0x279/0x2f0
>  tcp_bpf_recvmsg_parser+0x3c6/0x490
>  inet_recvmsg+0x280/0x290
>  sock_recvmsg+0xfc/0x120
>  ____sys_recvmsg+0x160/0x3d0
>  ___sys_recvmsg+0xf0/0x180
>  __sys_recvmsg+0xea/0x1a0
>  do_syscall_64+0x3f/0x90
>  entry_SYSCALL_64_after_hwframe+0x72/0xdc
> 
> The logic in tcp_bpf_recvmsg_parser is as follows:
> 
> msg_bytes_ready:
> 	copied = sk_msg_recvmsg(sk, psock, msg, len, flags);
> 	if (!copied) {
> 		wait data;
> 		goto msg_bytes_ready;
> 	}
> 
> In this case, "copied" alway is 0, the infinite loop occurs.
> 
> According to the Linux system call man page, 0 should be returned in this
> case. Therefore, in tcp_bpf_recvmsg_parser(), if the length is 0, directly
> return.
> 
> Also modify several other functions with the same problem.
> 
> Fixes: 1f5be6b3b063 ("udp: Implement udp_bpf_recvmsg() for sockmap")
> Fixes: 9825d866ce0d ("af_unix: Implement unix_dgram_bpf_recvmsg()")
> Fixes: c5d2177a72a1 ("bpf, sockmap: Fix race in ingress receive verdict with redirect to self")
> Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface")
> Signed-off-by: Liu Jian <liujian56@huawei.com>
> ---

Thanks.

Acked-by: John Fastabend <john.fastabend@gmail.com>