linux-kernel - Re: [RFC] selftests/x86: Add test

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Date:   Fri, 5 Jan 2018 19:23:54 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [RFC] selftests/x86: Add test_vsyscall

On Fri, Jan 05, 2018 at 09:53:16AM -0800, Andy Lutomirski wrote:
> emulate_noread would avoid one exploit technique that Kees saw
> somewhere.  And per-process disablement would let a system remain
> compatible with old binaries without reducing security for newer
> binaries.

Or we can simply say new binaries can switch to the vdso. Because this
way, vsyscall will never really be phased out - new shit will simply
keep using it.

-- 
Regards/Gruss,
    Boris.

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