linux-kernel - Re: [PATCH 2/3] objtool: Ignore retpoline alternatives

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: <20180111163326.deqtbqt72avfweup@treble>
Date:   Thu, 11 Jan 2018 10:33:26 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH 2/3] objtool: Ignore retpoline alternatives

On Thu, Jan 11, 2018 at 04:27:38PM +0000, David Woodhouse wrote:
> On Wed, 2018-01-10 at 19:48 -0600, Josh Poimboeuf wrote:
> > 
> > +#define ANNOTATE_NOSPEC_ALTERNATIVE                            \
> > +       "999:\n\t"                                              \
> > +       ".pushsection .discard.nospec\n\t"                      \
> > +       ".long 999b - .\n\t"                                    \
> > +       ".popsection\n\t"
> > +
> 
> <mode name="peterz">
>   Ick, numbers. Use .Lfoo_%= instead.
> </mode>

I seem to recall that not working with inline asm, maybe old versions of
GCC don't like it or something?  I can try it and see if 0-day bot
complains.

-- 
Josh