Re: [PATCH net] vsock/bpf: Handle EINTR connect() racing against sockmap update

[Michal Luczaj <mhal@rbox.co>]

On 3/7/25 10:27, Michal Luczaj wrote:
> Signal delivered during connect() may result in a disconnect of an already
> TCP_ESTABLISHED socket. Problem is that such established socket might have
> been placed in a sockmap before the connection was closed. We end up with a
> SS_UNCONNECTED vsock in a sockmap. And this, combined with the ability to
> reassign (unconnected) vsock's transport to NULL, breaks the sockmap
> contract. As manifested by WARN_ON_ONCE.
> 
> Ensure the socket does not stay in sockmap.
> 
> WARNING: CPU: 10 PID: 1310 at net/vmw_vsock/vsock_bpf.c:90 vsock_bpf_recvmsg+0xb4b/0xdf0
> CPU: 10 UID: 0 PID: 1310 Comm: a.out Tainted: G        W          6.14.0-rc4+
>  sock_recvmsg+0x1b2/0x220
>  __sys_recvfrom+0x190/0x270
>  __x64_sys_recvfrom+0xdc/0x1b0
>  do_syscall_64+0x93/0x1b0
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> 
> Fixes: 634f1a7110b4 ("vsock: support sockmap")
> Signed-off-by: Michal Luczaj <mhal@rbox.co>

This fix is insufficient; warning can be triggered another way. Apologies.

maintainer-netdev.rst says author can do that, so:
pw-bot: cr