linux-kernel - Re: possible deadlock in sidtab_sid2str

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Message-ID: <000000000000963c75059d34ded7@google.com>
Date:   Tue, 28 Jan 2020 07:28:01 -0800
From:   syzbot <syzbot+61cba5033e2072d61806@...kaller.appspotmail.com>
To:     eparis@...isplace.org, jannh@...gle.com, jeffv@...gle.com,
        keescook@...omium.org, linux-kernel@...r.kernel.org,
        omosnace@...hat.com, paul@...l-moore.com, paulmck@...nel.org,
        sds@...ho.nsa.gov, selinux@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: possible deadlock in sidtab_sid2str_put

syzbot has bisected this bug to:

commit d97bd23c2d7d866e99eb3a927c742715c85a90ef
Author: Ondrej Mosnacek <omosnace@...hat.com>
Date:   Tue Nov 26 13:57:00 2019 +0000

    selinux: cache the SID -> context string translation

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13fe5f69e00000
start commit:   b0be0eff Merge tag 'x86-pti-2020-01-28' of git://git.kerne..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=10015f69e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17fe5f69e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9784e57c96a92f20
dashboard link: https://syzkaller.appspot.com/bug?extid=61cba5033e2072d61806
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10088e95e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13fa605ee00000

Reported-by: syzbot+61cba5033e2072d61806@...kaller.appspotmail.com
Fixes: d97bd23c2d7d ("selinux: cache the SID -> context string translation")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection