linux-kernel - Re: KASAN: use-after-free Read in tty

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Message-ID: <20200425021835.GA849@sol.localdomain>
Date:   Fri, 24 Apr 2020 19:18:35 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     syzbot <syzbot+9af6d43c1beabec8fd05@...kaller.appspotmail.com>
Cc:     dvyukov@...gle.com, gleb@...nel.org, gregkh@...uxfoundation.org,
        gwshan@...ux.vnet.ibm.com, hpa@...or.com, jslaby@...e.com,
        jslaby@...e.cz, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, mpe@...erman.id.au, pbonzini@...hat.com,
        ruscur@...sell.cc, stewart@...ux.vnet.ibm.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: KASAN: use-after-free Read in tty_open

On Fri, Apr 24, 2020 at 05:23:03PM -0700, syzbot wrote:
> syzbot suspects this bug was fixed by commit:
> 
> commit ca4463bf8438b403596edd0ec961ca0d4fbe0220
> Author: Eric Biggers <ebiggers@...gle.com>
> Date:   Sun Mar 22 03:43:04 2020 +0000
> 
>     vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11594fc8100000
> start commit:   07c4b9e9 Merge tag 'scsi-fixes' of git://git.kernel.org/pu..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d
> dashboard link: https://syzkaller.appspot.com/bug?extid=9af6d43c1beabec8fd05
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=113886fae00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1263520ae00000
> 
> If the result looks correct, please mark the bug fixed by replying with:
> 
> #syz fix: vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console