linux-ext4 - Re: fuzz testing an ext4fs file system under a 32 bit Linux user mode linux guest let task jbd2/ubda hang

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] [day] [month] [year] [list]

Message-ID: <20140809200018.GG15431@thunk.org>
Date:	Sat, 9 Aug 2014 16:00:18 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-ext4@...r.kernel.org,
	UML devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: fuzz testing an ext4fs file system under a 32 bit Linux user
 mode linux guest let task jbd2/ubda hang

On Sat, Aug 09, 2014 at 08:45:43PM +0200, Toralf Förster wrote:
> 
> BTW may I just ask, if the following (same 32 bit system, host and
> UML guest are both at v3.16, 4 trinity childs hammering victims
> files in a ramdisk within the uML guest) matches the above too ? Or
> does the BUG output here more helpful data ? :

Unfortunately, there's nothing useful here.  There is more than one
BUG_ON() in this mpage_release_unused_pages function, and what's more,
we have no idea which syscall or combination of syscalls might have
left a page in a particular state.

					- Ted
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html