linux-kernel - Re: [RESEND] [PATCH] Hold back_lock when calling iscsi_complete

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:   Mon, 25 Feb 2019 11:02:25 +0100
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Lee Duncan <leeman.duncan@...il.com>, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, cleech@...hat.com
Cc:     hare@...e.de, Lee Duncan <lduncan@...e.com>
Subject: Re: [RESEND] [PATCH] Hold back_lock when calling iscsi_complete_task

On 22/02/2019 17:29, Lee Duncan wrote:
> From: Lee Duncan <lduncan@...e.com>
> 
> If there is an error queueing an iscsi command in
> iscsi_queuecommand(), for example if the transport fails
> to take the command in sessuin->tt->xmit_task(), then
> the error path can call iscsi_complete_task() without
> first aquiring the back_lock as required. This can
> lead to things like ITT pool can get corrupt, resulting
> in duplicate ITTs being sent out.
> 
> The solution is to hold the back_lock around
> iscsi_complete_task() calls, and to add a little commenting
> to help others understand when back_lock must be held.

You're missing a S-o-b here.

Byte,
	Johannes
-- 
Johannes Thumshirn                            SUSE Labs Filesystems
jthumshirn@...e.de                                +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850