linux-kernel - Re: [PATCH v4 05/14] arm64, mm: Make randomization selected by generic topdown mmap layout

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Date:   Mon, 3 Jun 2019 18:40:01 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Alexandre Ghiti <alex@...ti.fr>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 05/14] arm64, mm: Make randomization selected by
 generic topdown mmap layout

On Sun, May 26, 2019 at 09:47:37AM -0400, Alexandre Ghiti wrote:
> This commits selects ARCH_HAS_ELF_RANDOMIZE when an arch uses the generic
> topdown mmap layout functions so that this security feature is on by
> default.
> Note that this commit also removes the possibility for arm64 to have elf
> randomization and no MMU: without MMU, the security added by randomization
> is worth nothing.

Not planning on this anytime soon ;).

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