linux-kernel - Re: 2.6.18-rc2, problem to wake up spinned down drive?

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:	Wed, 02 Aug 2006 12:56:10 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Tejun Heo <htejun@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.18-rc2, problem to wake up spinned down drive?

Tejun Heo wrote:
> Harald Dunkel wrote:
>> Tejun Heo wrote:
>>> Can you try the following instead of hdparm?
>>>
>>> echo 1 > /sys/bus/scsi/devices/1:0:0:0/power/state
>>>
>>> It will make libata involved in putting the disk to sleep and waking it
>>> up, and, when waking, it will kick the drive in the ass by resetting the
>>> channel.  Please try with the latest -rc kernel.
>>>
>>
>> Sorry to say, but this did not work:
>>
>> # echo 1 > /sys/bus/scsi/devices/0:0:0:0/power/state
>> bash: echo: write error: Invalid argument
>> # ll !$
>> ll /sys/bus/scsi/devices/0:0:0:0/power/state
>> -rw-r--r-- 1 root root 0 Aug  1 20:00 
>> /sys/bus/scsi/devices/0:0:0:0/power/state
>> # cat !$
>> cat /sys/bus/scsi/devices/0:0:0:0/power/state
>> 0
>> # uname -a
>> Linux bugs 2.6.18-rc3 #2 PREEMPT Sun Jul 30 16:26:22 CEST 2006 i686 
>> GNU/Linux
> 
> You probably should do 'echo -n 1', the parsing function is pretty picky.
> 
Given that the data from the "cat" of state returned a zero with 
newline, perhaps unreasonably picky. On a Fedora kernel it just doesn't 
seem to work for SATA drives, sample size = 1.

-- 
Bill Davidsen <davidsen@....com>
   Obscure bug of 2004: BASH BUFFER OVERFLOW - if bash is being run by a
normal user and is setuid root, with the "vi" line edit mode selected,
and the character set is "big5," an off-by-one errors occurs during
wildcard (glob) expansion.
-
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/