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nbd: restrict sockets to TCP and UDP

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[ Upstream commit 9f7c02e031570e8291a63162c6c046dc15ff85b0 ]

Recently, syzbot started to abuse NBD with all kinds of sockets.

Commit cf1b2326b7 ("nbd: verify socket is supported during setup")
made sure the socket supported a shutdown() method.

Explicitely accept TCP and UNIX stream sockets.

Fixes: cf1b2326b7 ("nbd: verify socket is supported during setup")
Reported-by: syzbot+e1cd6bd8493060bd701d@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/netdev/CANn89iJ+76eE3A_8S_zTpSyW5hvPRn6V57458hCZGY5hbH_bFA@mail.gmail.com/T/#m081036e8747cd7e2626c1da5d78c8b9d1e55b154
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: Richard W.M. Jones <rjones@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Yu Kuai <yukuai1@huaweicloud.com>
Cc: linux-block@vger.kernel.org
Cc: nbd@other.debian.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet
2025-09-09 13:22:43 +00:00
committed by Greg Kroah-Hartman
parent 37e5190d4b
commit 4f9e6ff631
1 changed files with 8 additions and 0 deletions
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8
drivers/block/nbd.c
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@@ -1128,6 +1128,14 @@ static struct socket *nbd_get_socket(struct nbd_device *nbd, unsigned long fd,
if (!sock)
return NULL;
if (!sk_is_tcp(sock->sk) &&
!sk_is_stream_unix(sock->sk)) {
dev_err(disk_to_dev(nbd->disk), "Unsupported socket: should be TCP or UNIX.\n");
*err = -EINVAL;
sockfd_put(sock);
return NULL;
}
if (sock->ops->shutdown == sock_no_shutdown) {
dev_err(disk_to_dev(nbd->disk), "Unsupported socket: shutdown callout must be supported.\n");
*err = -EINVAL;