linux-kernel - Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app protection modes

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: <alpine.DEB.2.21.1811191433100.1537@nanos.tec.linutronix.de>
Date:   Mon, 19 Nov 2018 14:36:32 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jiri Kosina <jikos@...nel.org>
cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>,
        Waiman Long <longman9394@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Willy Tarreau <w@....eu>
Subject: Re: [Patch v5 11/16] x86/speculation: Add Spectre v2 app to app
 protection modes

On Sun, 18 Nov 2018, Jiri Kosina wrote:
> On Sat, 17 Nov 2018, Jiri Kosina wrote:

> Subject: [PATCH] x86/speculation: enforce STIBP for SECCOMP tasks in lite mode
> 
> If 'lite' mode of app2app protection from spectre_v2 is selected on
> kernel command-line, we are currently applying STIBP protection to
> non-dumpable tasks, and tasks that have explicitly requested such
> protection via
> 
> 	prctl(PR_SET_SPECULATION_CTRL, PR_SPEC_INDIR_BRANCH, PR_SPEC_ENABLE, 0, 0);
> 
> Let's extend this to cover also SECCOMP tasks (analogically to how we
> apply SSBD protection).

Right. And SSBD does not fiddle with dumpable.

Willy had concerns about the (ab)use of dumpable so I'm holding off on that
bit for now.

Thanks,

	tglx