linux-kernel - Re: [clang] stack protector and f1f029c7bf

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <40166a47-749e-e6a8-41fa-e5dc0defaaab@zytor.com>
Date:   Thu, 24 May 2018 14:49:32 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Alistair Strachan <astrachan@...gle.com>,
        Manoj Gupta <manojgupta@...gle.com>,
        Matthias Kaehlcke <mka@...gle.com>,
        Greg Hackmann <ghackmann@...gle.com>, sedat.dilek@...il.com,
        tstellar@...hat.com, LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...gle.com>
Subject: Re: [clang] stack protector and f1f029c7bf

On 05/24/18 14:12, Nick Desaulniers wrote:
> 
> Looks like those builtins got added to GCC around the 4.9 timeframe:
> https://godbolt.org/g/9VS2E9
> 
> Problematically, it seems that GCC does not have __has_builtin to do
> feature detection:
> https://clang.llvm.org/docs/LanguageExtensions.html#feature-checking-macros
> https://godbolt.org/g/oku8ux
> 

We have support in the kernel build system for doing that, though.

I just added a concurring opinion to the gcc bug report:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66970