linux-kernel - Re: mm: NULL ptr deref in remove_migration

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: <alpine.DEB.2.11.1406170907540.12946@gentwo.org>
Date:	Tue, 17 Jun 2014 09:09:09 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Sasha Levin <sasha.levin@...cle.com>
cc:	Hugh Dickins <hughd@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Mel Gorman <mgorman@...e.de>, Bob Liu <bob.liu@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: mm: NULL ptr deref in remove_migration_pte

On Mon, 16 Jun 2014, Sasha Levin wrote:

> It took some time to hit something here, but I think that the following
> is related:

This related thing looks like someone did a random memset. The SLUB
diagnostic show the object, redzone and padding were overwritten with
zeros.

> [  494.710068] =============================================================================
> [  494.710068] BUG page->ptl (Not tainted): Redzone overwritten
> [  494.710068] -----------------------------------------------------------------------------
> [  494.710068]
> [  494.710068] INFO: 0xffff8804e4730e58-0xffff8804e4730e5f. First byte 0x0 instead of 0xbb
> [  494.710068] INFO: Slab 0xffffea001391cc00 objects=40 used=40 fp=0x          (null) flags=0x56fffff80004080
> [  494.710068] INFO: Object 0xffff8804e4730e10 @offset=3600 fp=0x          (null)
> [  494.710068]
> [  494.710068] Bytes b4 ffff8804e4730e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> [  494.710068] Object ffff8804e4730e10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> [  494.710068] Object ffff8804e4730e20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> [  494.710068] Object ffff8804e4730e30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> [  494.710068] Object ffff8804e4730e40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
> [  494.710068] Object ffff8804e4730e50: 00 00 00 00 00 00 00 00                          ........
> [  494.710068] Redzone ffff8804e4730e58: 00 00 00 00 00 00 00 00                          ........
> [  494.710068] Padding ffff8804e4730f98: 00 00 00 00 00 00 00 00                          ........
--
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/