linux-kernel - Re: [PATCH v3 2/2] MIPS: io: add a barrier after register read in readX()

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:   Thu, 12 Apr 2018 18:38:39 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     James Hogan <jhogan@...nel.org>
Cc:     linux-mips@...ux-mips.org, arnd@...db.de, timur@...eaurora.org,
        sulrich@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] MIPS: io: add a barrier after register read in
 readX()

On 4/12/2018 5:58 PM, James Hogan wrote:
> On Thu, Apr 12, 2018 at 10:51:49PM +0100, James Hogan wrote:
>> On Tue, Apr 03, 2018 at 08:55:04AM -0400, Sinan Kaya wrote:
>>> While a barrier is present in writeX() function before the register write,
>>> a similar barrier is missing in the readX() function after the register
>>> read. This could allow memory accesses following readX() to observe
>>> stale data.
>>>
>>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>>> Reported-by: Arnd Bergmann <arnd@...db.de>
>>
>> Both patches look like obvious improvements to me, so I'm happy to apply
>> to my fixes branch.
> 
> Though having said that, a comment to go with the rmb() (as suggested by
> checkpatch) to detail the situation we're concerned about would be nice
> to have.

I can send a new version. No worries. 

Functional correctness is more important at this moment. I can accommodate
any nice to haves.

> 
> Cheers
> James
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.