linux-kernel - Re: [PATCH] ARC: ARCv2: jump label: implement jump label patching

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: <991ace9d-ef6d-0f29-d4f4-03ba47a7f7ff@synopsys.com>
Date:   Wed, 3 Jul 2019 16:15:09 +0000
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Alexey Brodkin" <Alexey.Brodkin@...opsys.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH] ARC: ARCv2: jump label: implement jump label patching

On 6/18/19 9:16 AM, Vineet Gupta wrote:
> On 6/14/19 9:41 AM, Eugeniy Paltsev wrote:
>> Implement jump label patching for ARC. Jump labels provide
>> an interface to generate dynamic branches using
>> self-modifying code.
>>
>> This allows us to implement conditional branches where
>> changing branch direction is expensive but branch selection
>> is basically 'free'
>>
>> This implementation uses 32-bit NOP and BRANCH instructions
>> which forced to be aligned by 4 to guarantee that they don't
>> cross L1 cache line and can be update atomically.
>>
>> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> LGTM overall - nits below.
> 

Can you address the review comments soon so this gets merged in 5.3 whose merge
window is looming !