linux-kernel - Re: general protection fault in selinux_socket

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Message-ID: <2340a1a3-37cf-5f55-1f9a-9052a557f579@I-love.SAKURA.ne.jp>
Date:   Tue, 26 Nov 2019 07:03:51 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot <syzbot+314db21f0d5c1f53856c@...kaller.appspotmail.com>,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Cc:     andriin@...com, anton@...msg.org, ast@...nel.org,
        bpf@...r.kernel.org, ccross@...roid.com, daniel@...earbox.net,
        eparis@...isplace.org, kafai@...com, keescook@...omium.org,
        linux-kernel@...r.kernel.org, paul@...l-moore.com,
        sds@...ho.nsa.gov, selinux@...r.kernel.org, songliubraving@...com,
        tony.luck@...el.com, yhs@...com
Subject: Re: general protection fault in selinux_socket_sendmsg (2)

On 2019/11/26 4:28, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    6b8a7946 Merge tag 'for_linus' of git://git.kernel.org/pub..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1680ab8ce00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4737c15fc47048f2
> dashboard link: https://syzkaller.appspot.com/bug?extid=314db21f0d5c1f53856c
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.

Original bug has syz reproducer.

> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+314db21f0d5c1f53856c@...kaller.appspotmail.com
> 

net/rxrpc/output.c:655

#syz dup: KMSAN: use-after-free in rxrpc_send_keepalive