linux-hardening - RE: [PATCH v2] MIPS: Only use current_stack

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Date:   Wed, 9 Mar 2022 22:44:52 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Kees Cook' <keescook@...omium.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
CC:     Nathan Chancellor <nathan@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Yanteng Si <siyanteng01@...il.com>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Mark Rutland <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: RE: [PATCH v2] MIPS: Only use current_stack_pointer on GCC

From: Kees Cook
> Sent: 09 March 2022 22:10
> 
> Unfortunately, Clang did not have support for "sp" as a global register
> definition, and was crashing after the addition of current_stack_pointer.
> This has been fixed in Clang 15, but earlier Clang versions need to
                               ^^ 14
> avoid this code, so add a versioned test and revert back to the
> open-coded asm instances. Fixes Clang build error:
> 
> fatal error: error in backend: Invalid register name global variable

	David

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