linux-kernel - Re: [Bug #13112] Oops in drain

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.2.00.0904271327140.11650@chino.kir.corp.google.com>
Date:	Mon, 27 Apr 2009 13:36:46 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Bart <mmx@....pl>
cc:	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [Bug #13112] Oops in drain_array

On Mon, 27 Apr 2009, Bart wrote:

> After turning the suggested debuging options I've got tons of these when
> trying to stress the tape device like before:
> 
> Apr 27 16:57:30 fs kernel: [   96.446708] slab error in verify_redzone_free():
> cache `size-128': memory outside object was overwritten
> Apr 27 16:57:30 fs kernel: [   96.446713] Pid: 0, comm: swapper Not tainted
> 2.6.29.1-64 #2
> Apr 27 16:57:30 fs kernel: [   96.446715] Call Trace:
> Apr 27 16:57:30 fs kernel: [   96.446717]  <IRQ>  [<ffffffff8029adc5>]
> __slab_error+0x1f/0x25
> Apr 27 16:57:30 fs kernel: [   96.446728]  [<ffffffff8029b24b>]
> cache_free_debugcheck+0x108/0x1d6
> Apr 27 16:57:30 fs kernel: [   96.446731]  [<ffffffff8029b473>]
> kfree+0x81/0xc2
> Apr 27 16:57:30 fs kernel: [   96.446735]  [<ffffffff802bd311>]
> bio_free_map_data+0xc/0x1e

This appears to be kfree(bmd->iovecs) in bio_free_map_data().  It looks 
like the memcpy size in bio_set_map_data() overrides the kmalloc size; in 
other words, for a redzone error, bio->bi_vcnt > nr_pages in 
bio_copy_user_iov().
--
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/