From: Kees Cook <keescook@chromium.org>
To: syzbot <syzbot+370a6b0f11867bf13515@syzkaller.appspotmail.com>
Cc: acme@kernel.org, akpm@linux-foundation.org, arnd@arndb.de,
bp@alien8.de, bp@suse.de, christian@brauner.io,
cyphar@cyphar.com, dhowells@redhat.com, dvyukov@google.com,
ebiederm@xmission.com, frederic@kernel.org,
gustavo@embeddedor.com, hpa@zytor.com, jannh@google.com,
jolsa@redhat.com, linux-kernel@vger.kernel.org, luto@kernel.org,
mark.rutland@arm.com, mhiramat@kernel.org, mingo@kernel.org,
mingo@redhat.com, mtk.manpages@gmail.com, namhyung@kernel.org,
oleg@redhat.com, peterz@infradead.org,
syzkaller-bugs@googlegroups.com, tglx@linutronix.de,
torvalds@linux-foundation.org, viro@zeniv.linux.org.uk,
x86@kernel.org
Subject: Re: WARNING in arch_install_hw_breakpoint
Date: Mon, 9 Dec 2019 16:10:13 -0800 [thread overview]
Message-ID: <201912091608.1DA5B7865F@keescook> (raw)
In-Reply-To: <0000000000007f8bf6059932fe10@google.com>
On Sun, Dec 08, 2019 at 07:33:00AM -0800, syzbot wrote:
> syzbot suspects this bug was fixed by commit:
>
> commit b3e5838252665ee4cfa76b82bdf1198dca81e5be
> Author: Christian Brauner <christian@brauner.io>
> Date: Wed Mar 27 12:04:15 2019 +0000
>
> clone: add CLONE_PIDFD
That seems ... unlikely? I suspect this WARN should just be pr_err or
something:
if (WARN_ONCE(i == HBP_NUM, "Can't find any breakpoint slot"))
return -EBUSY;
If it's reachable through normal code, it shouldn't be possible to trip
a WARN.
-Kees
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1268377ae00000
> start commit: fd1f297b Merge tag 'drm-fixes-2019-03-22' of git://anongit..
> git tree: upstream
> kernel config: https://syzkaller.appspot.com/x/.config?x=9a31fb246de2a622
> dashboard link: https://syzkaller.appspot.com/bug?extid=370a6b0f11867bf13515
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15d8bd93200000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15439f27200000
>
> If the result looks correct, please mark the bug fixed by replying with:
>
> #syz fix: clone: add CLONE_PIDFD
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
--
Kees Cook
next prev parent reply other threads:[~2019-12-10 0:10 UTC|newest]
Thread overview: 233+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-24 6:22 WARNING in arch_install_hw_breakpoint syzbot
2019-03-24 6:23 ` syzbot
2019-03-24 6:24 ` syzbot
2019-03-24 6:25 ` syzbot
2019-03-24 6:26 ` syzbot
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2019-03-24 9:07 ` syzbot
2019-03-24 9:07 ` Borislav Petkov
2019-03-24 13:07 ` Dmitry Vyukov
2019-03-24 14:00 ` Borislav Petkov
2019-03-24 9:08 ` syzbot
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2019-03-24 10:01 ` syzbot
2019-03-24 10:02 ` syzbot
2019-03-24 10:03 ` syzbot
2019-03-27 13:28 ` Borislav Petkov
2019-03-27 13:45 ` Dmitry Vyukov
2019-03-27 15:17 ` Borislav Petkov
2019-03-27 17:48 ` Borislav Petkov
2019-03-28 5:27 ` Frederic Weisbecker
2019-12-08 15:33 ` syzbot
2019-12-10 0:10 ` Kees Cook [this message]
2019-12-10 9:23 ` Christian Brauner
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