linux-kernel - Re: fanotify bug on gdb -- hard crash

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20141226221444.GA13349@amd>
Date:	Fri, 26 Dec 2014 23:14:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	ivo.welch@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: fanotify bug on gdb -- hard crash

On Fri 2014-12-26 22:45:38, ivo welch wrote:
> I am not a kernel developer, so forgive the intrusion.

Good bug reports are always welcome.

> I suspect I have found either a bug in gdb (less likely) or a bug in
> fanotify (more likely).  it is replicable, and the code is almost
> unchanged from the example in the fanotify man page.  to trigger it,
> all an su needs to do is to step through the program below with gdb
> 7.8.1 'n' command, and linux locks up the system pretty hard (reboot

Hard lockup -> this can't be gdb problem.

> required).  I have confirmed the replicability of this issue on a
> clean arch 2014.12.01 3.17.6-1 system and on a clean ubuntu 14.10
> system, both VMs created just to check it.  /iaw

Does it need root priviledges to trigger?

Best regards,
								Pavel


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/