linux-kernel - Re: [PATCH V2] IB/core: Add mitigation for Spectre V1

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: <c48b7b8db29126fe8991a4b65ed0b793f10501fa.camel@redhat.com>
Date:   Wed, 31 Jul 2019 14:52:59 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "Luck, Tony" <tony.luck@...el.com>, Ira Weiny <ira.weiny@...el.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
        Parav Pandit <parav@...lanox.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] IB/core: Add mitigation for Spectre V1

On Wed, 2019-07-31 at 12:52 -0500, Gustavo A. R. Silva wrote:
> This is insufficient. The speculation windows are large:
> 
> "Speculative  execution  on  modern  CPUs  can  run  several
> hundred  instructions  ahead." [1]
> 
> [1] https://spectreattack.com/spectre.pdf

Thanks, I'll take a look at that.  That issue aside, returning without
wasting time on two mutexes is still better IMO, so I like my patch more
than the proposed one.  Tony, would you like to resubmit?

-- 
Doug Ledford <dledford@...hat.com>
    GPG KeyID: B826A3330E572FDD
    Fingerprint = AE6B 1BDA 122B 23B4 265B  1274 B826 A333 0E57 2FDD

Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)