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Date: Mon, 5 Mar 2018 08:41:43 -0800
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: Alexander Popov <alex.popov@...ux.com>,
 kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org>,
 PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>,
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 Will Deacon <will.deacon@....com>, Arnd Bergmann <arnd@...db.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v9 2/7] x86/entry: Add STACKLEAK erasing the kernel
 stack at the end of syscalls

On 03/03/2018 12:00 PM, Alexander Popov wrote:
>  Documentation/x86/x86_64/mm.txt  |   2 +
>  arch/Kconfig                     |  27 ++++++++++
>  arch/x86/Kconfig                 |   1 +
>  arch/x86/entry/entry_32.S        |  88 +++++++++++++++++++++++++++++++
>  arch/x86/entry/entry_64.S        | 108 +++++++++++++++++++++++++++++++++++++++
>  arch/x86/entry/entry_64_compat.S |  11 ++++

This is a *lot* of assembly.  I wonder if you tried at all to get more
of this into C or whether you just inherited the assembly from the
original code?

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