linux-kernel - Re: 4.3-rc7: kmemleak BUG: Redzone overwritten

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]

Date:	Tue, 27 Oct 2015 18:06:50 +0200
From:	Aaro Koskinen <aaro.koskinen@...ia.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 4.3-rc7: kmemleak BUG: Redzone overwritten

Hi,

On Tue, Oct 27, 2015 at 05:56:11PM +0200, Andy Shevchenko wrote:
> On Tue, 2015-10-27 at 17:46 +0200, Aaro Koskinen wrote:
> > With 4.3-rc7 and slub_debug=FZUP, I get the below when reading
> > /sys/kernel/debug/kmemleak with a large number of reported entries.
> > It's pretty repeatable. HW is MIPS64.
> > 
> > With the SLUB debugging disabled, box crashes randomly in
> > kmem_cache_free
> > or kmem_cache_alloc when the kmemleak file is read on a running
> > system.
> > 
> > Seems to start with 6fc37c490076 ("kmemleak: use seq_hex_dump() to
> > dump buffers").
> 
> So, you mean reverting it does help?

Yes.

> Btw, we have kmemleak test suite. Any suggestion how can it be
> reproducible with it?

Maybe a add test for big number of objects? In this case there are 3072
reported objects.

A.
--
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/