linux-kernel - Re: [PATCH] arch: x86: power: cpu: init %gs before __restore_processor

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: <20200916081708.GK2674@hirez.programming.kicks-ass.net>
Date:   Wed, 16 Sep 2020 10:17:08 +0200
From:   peterz@...radead.org
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Borislav Petkov <bp@...en8.de>, Roman Kiryanov <rkir@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        linux-pm@...r.kernel.org, Greg KH <gregkh@...uxfoundation.org>,
        Alistair Delva <adelva@...gle.com>,
        Haitao Shan <hshan@...gle.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Martin Liška <mliska@...e.cz>
Subject: Re: [PATCH] arch: x86: power: cpu: init %gs before
 __restore_processor_state (clang)

On Tue, Sep 15, 2020 at 12:51:47PM -0700, Nick Desaulniers wrote:
> It would be much nicer if we had the flexibility to disable stack
> protectors per function, rather than per translation unit.  I'm going
> to encourage you to encourage your favorite compile vendor ("write to
> your senator") to support the function attribute
> __attribute__((no_stack_protector)) so that one day, we can use that
> to stop shipping crap like a9a3ed1eff360 ("x86: Fix early boot crash
> on gcc-10, third try"). 

I think we were all in favour of having that, not sure why it hasn't
happened yet. More important matters I suppose :/