linux-kernel - Re: [PATCH 16/18] crypto: talitos - do hw_context DMA mapping outside the requests

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]

Message-ID: <AM0PR0402MB3329F899D4777EE356BBE2B698CD0@AM0PR0402MB3329.eurprd04.prod.outlook.com>
Date:   Thu, 22 Feb 2018 12:29:28 +0000
From:   Horia Geantă <horia.geanta@....com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        Christophe LEROY <christophe.leroy@....fr>
CC:     "David S. Miller" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 16/18] crypto: talitos - do hw_context DMA mapping outside
 the requests

On 2/22/2018 1:47 PM, Herbert Xu wrote:
> On Tue, Feb 20, 2018 at 11:32:25AM +0000, Horia Geantă wrote:
>>
>> If final/finup is optional, how is the final hash supposed to be retrieved?
> 
> Sometimes the computation ends with a partial hash, that's what
> export is for.  Also it is completely legal to abandon the hash
> state entirely.
> 
Thanks for the explanation.
It's unintuitive to call .init() -> .update() and then not to call any of
.final(), .finup(), .export().

Christophe,

IIUC this means that there is no room for improvement.
This patch needs to be reverted, to restore previous behaviour when the
hw_context was mapped / unmapped for every request.

Thanks,
Horia