linux-kernel - Re: [PATCH net] nbd: always initialize struct msghdr completely

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Message-Id: <170550648165.620853.7074880501945877841.b4-ty@kernel.dk>
Date: Wed, 17 Jan 2024 08:48:01 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Eric Dumazet <edumazet@...gle.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org, 
 Eric Dumazet <eric.dumazet@...il.com>, syzbot <syzkaller@...glegroups.com>, 
 stable@...r.kernel.org, Josef Bacik <josef@...icpanda.com>, 
 linux-block@...r.kernel.org, nbd@...er.debian.org
Subject: Re: [PATCH net] nbd: always initialize struct msghdr completely


On Fri, 12 Jan 2024 13:26:57 +0000, Eric Dumazet wrote:
> syzbot complains that msg->msg_get_inq value can be uninitialized [1]
> 
> struct msghdr got many new fields recently, we should always make
> sure their values is zero by default.
> 
> [1]
>  BUG: KMSAN: uninit-value in tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571
>   tcp_recvmsg+0x686/0xac0 net/ipv4/tcp.c:2571
>   inet_recvmsg+0x131/0x580 net/ipv4/af_inet.c:879
>   sock_recvmsg_nosec net/socket.c:1044 [inline]
>   sock_recvmsg+0x12b/0x1e0 net/socket.c:1066
>   __sock_xmit+0x236/0x5c0 drivers/block/nbd.c:538
>   nbd_read_reply drivers/block/nbd.c:732 [inline]
>   recv_work+0x262/0x3100 drivers/block/nbd.c:863
>   process_one_work kernel/workqueue.c:2627 [inline]
>   process_scheduled_works+0x104e/0x1e70 kernel/workqueue.c:2700
>   worker_thread+0xf45/0x1490 kernel/workqueue.c:2781
>   kthread+0x3ed/0x540 kernel/kthread.c:388
>   ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147
>   ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
> 
> [...]

Applied, thanks!

[1/1] nbd: always initialize struct msghdr completely
      commit: 78fbb92af27d0982634116c7a31065f24d092826

Best regards,
-- 
Jens Axboe