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

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Message-ID: <0000000000002d42ee05a4127cfc@google.com>
Date:   Fri, 24 Apr 2020 17:23:03 -0700
From:   syzbot <syzbot+9af6d43c1beabec8fd05@...kaller.appspotmail.com>
To:     dvyukov@...gle.com, ebiggers@...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

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