linux-kernel - Re: [PATCH] esp_scsi: Clear Transfer Count registers before PIO transfers

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] [day] [month] [year] [list]

Message-ID: <alpine.LNX.2.21.1.1911201006520.10@nippy.intranet>
Date:   Wed, 20 Nov 2019 10:12:21 +1100 (AEDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Kars de Jong <jongk@...ux-m68k.org>
cc:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Michael Schmitz <schmitzmic@...il.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] esp_scsi: Clear Transfer Count registers before PIO
 transfers

On Tue, 19 Nov 2019, I wrote:

> 
> But this is a theoretical problem so far. You may need to use sg_utils 
> to generate a SCSI command like that.
> 
> (For a DMA controller subject to, say, 24-bit boundaries, there are 
> additional ways to end up with short transfers.)
> 

On reflection these probably can't happen in practice. I was being 
over-cautious. So I'll leave this patch out-of-tree until there's a need 
for it (i.e. some driver that uses both DMA and PIO in data phases).

--