linux-kernel - Re: [PATCH v4 05/12] elf: Allow arch to tweak initial mmap prot flags

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Message-ID: <20200114163859.GI30444@arrakis.emea.arm.com>
Date:   Tue, 14 Jan 2020 16:38:59 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Paul Elliott <paul.elliott@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Marc Zyngier <maz@...nel.org>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        "H.J. Lu" <hjl.tools@...il.com>, Andrew Jones <drjones@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, Jann Horn <jannh@...gle.com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Kristina Martšenko <kristina.martsenko@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Florian Weimer <fweimer@...hat.com>,
        Sudakshina Das <sudi.das@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v4 05/12] elf: Allow arch to tweak initial mmap prot flags

On Wed, Dec 11, 2019 at 03:41:59PM +0000, Mark Brown wrote:
> From: Dave Martin <Dave.Martin@....com>
> 
> An arch may want to tweak the mmap prot flags for an
> ELFexecutable's initial mappings.  For example, arm64 is going to
> need to add PROT_BTI for executable pages in an ELF process whose
> executable is marked as using Branch Target Identification (an
> ARMv8.5-A control flow integrity feature).
> 
> So that this can be done in a generic way, add a hook
> arch_elf_adjust_prot() to modify the prot flags as desired: arches
> can select CONFIG_HAVE_ELF_PROT and implement their own backend
> where necessary.
> 
> By default, leave the prot flags unchanged.
> 
> Signed-off-by: Dave Martin <Dave.Martin@....com>
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Mark Brown <broonie@...nel.org>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>