linux-kernel - Re: [PATCH 3/5] libata: Implement disk shock protection support

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <489523DC.2090903@gmail.com>
Date:	Sun, 03 Aug 2008 12:19:56 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Elias Oltmanns <eo@...ensachen.de>, Jeff Garzik <jeff@...zik.org>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	Pavel Machek <pavel@....cz>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] libata: Implement disk shock protection support

Alan Cox wrote:
>> However, SATA or not, there simply isn't a way to abort commands in ATA.
>>  Issuing random command while other commands are in progress simply is
>> state machine violation and there will be many interesting results
>> including complete system lockup (ATA controller dying while holding the
>> PCI bus).  The only reliable way to abort in-flight commands are by
>> issuing hardreset.  However, ATA reset protocol is not designed for
>> quick recovery.  The machine is gonna hit the ground hard way before the
>> reset protocol is complete.
> 
> Actually you cau can issue idle immediate on older ATA devices. I am not
> clear if that was stuck back into the current accelerometer friendly
> drives or not. Would need to check with IBLenovo

Was that something intentional or was it a happy accident?  There can be
bus ownership problem on PATA and on SATA this is much more state logic
on both sides of the cable and I think things like that would be more
difficult to work accidentally.

Thanks.

-- 
tejun
--
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/