linux-kernel - Re: KASLR vs. KASAN on x86

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Message-ID: <ldxj7p22ze4ccoe4bmojhlabflw34t6jwyh24fklvessdyyial@w3fw6wwo7icp>
Date:   Wed, 31 May 2023 17:05:46 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Andrey Ryabinin <ryabinin.a.a@...il.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com, Kees Cook <keescook@...omium.org>,
        Thomas Garnier <thgarnie@...gle.com>
Subject: Re: KASLR vs. KASAN on x86

On Mon, Mar 13, 2023 at 02:40:33PM +0100, Andrey Ryabinin <ryabinin.a.a@...il.com> wrote:
> Yes, with the vaddr_end = KASAN_SHADOW_START  it should work,
>  kaslr_memory_enabled() can be removed in favor of just the kaslr_enabled()

Thanks. FWIW, I've found the cautionary comment at vaddr_end from the
commit 1dddd2512511 ("x86/kaslr: Fix the vaddr_end mess"), so I'm not
removing kaslr_enabled_enabled() now.

Michal

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