linux-kernel - Re: [PATCH] x86/retpoline: Fix NOSPEC

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.2.20.1801100248230.2200@nanos>
Date:   Wed, 10 Jan 2018 02:50:12 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <andi@...stfloor.org>
cc:     Tom Lendacky <thomas.lendacky@....com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Paul Turner <pjt@...gle.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Jiri Kosina <jikos@...nel.org>, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] x86/retpoline: Fix NOSPEC_JMP for tip

On Tue, 9 Jan 2018, Andi Kleen wrote:

> > > I think there are areas that rely on X86_FEATURE_RETPOLINE being set
> > > even if X86_FEATURE_RETPOLINE_AMD is set.  For example, line 261 in
> > > arch/x86/entry/entry_32.S is only checking for X86_FEATURE_RETPOLINE.
> > 
> > I audited the difference places. They all seem ok.
> 
> Actually 32bit is not ok. For 32bit we need COMMON. So adding it.

Please keep the current X86_FEATURE_RETPOLINE as the common one and add a
new X86_FEATURE_RETPOLINE_GENERIC which is selected by the generic/intel
side. Little more churn, but clearer.

Thanks,

	tglx