linux-kernel - Re: BUG kmalloc-4096: Poison 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:	Sat, 05 Jun 2010 23:41:04 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	linux-video@...ey.karlin.mff.cuni.cz
Subject: Re: BUG kmalloc-4096: Poison overwritten

On 06/05/2010 11:27 PM, Jiri Slaby wrote:
> On 06/06/2010 08:12 AM, Justin P. Mattock wrote:
>> =============================================================================
>>
>> [    0.002046] BUG kmalloc-4096: Poison overwritten
>> [    0.002051]
>> -----------------------------------------------------------------------------
>>
>> [    0.002052]
>> [    0.002063] INFO: 0xffff88003ec09e00-0xffff88003ec09e9f. First byte
>> 0x20 instead of 0x6b
>> [    0.002073] INFO: Slab 0xffffea0000dba1c0 objects=7 used=1
>> fp=0xffff88003ec09048 flags=0x40000000000040c3
>> [    0.002082] INFO: Object 0xffff88003ec09048 @offset=4168
>> fp=0xffff88003ec0a090
>> [    0.002083]
>> [    0.002093] Bytes b4 0xffff88003ec09038:  00 00 00 00 00 00 00 00 5a
>> 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ
>> [    0.002114]   Object 0xffff88003ec09048:  6b 6b 6b 6b 6b 6b 6b 6b 6b
>> 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
> ...
>> 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
>> [    0.002999]   Object 0xffff88003ec09df8:  6b 6b 6b 6b 6b 6b 6b 6b 20
>> 07 20 07 20 07 20 07 kkkkkkkk........
>> [    0.002999]   Object 0xffff88003ec09e08:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e18:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e28:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e38:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e48:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e58:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e68:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e78:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e88:  20 07 20 07 20 07 20 07 20
>> 07 20 07 20 07 20 07 ................
>> [    0.002999]   Object 0xffff88003ec09e98:  20 07 20 07 20 07 20 07 6b
>> 6b 6b 6b 6b 6b 6b 6b ........kkkkkkkk
>> [    0.002999]   Object 0xffff88003ec09ea8:  6b 6b 6b 6b 6b 6b 6b 6b 6b
>
> Just guessing, grey spaces which should go to video ram?
>

not sure if it's grey spaces etc.. one thing I know is this seem's 
reproducible i.g. rebooted 3/4 time's and every boot this showed
up.. I will do a bisect..(keep in mind it's late right now,
and am a bit sauced..will do in the morning)

Justin P. Mattock
--
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/