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Date: Thu, 4 Apr 2019 10:03:58 -0700
From: Kees Cook <>
To: "Reshetova, Elena" <>
Cc: Andy Lutomirski <>, Kernel Hardening <>, 
	Andy Lutomirski <>, Josh Poimboeuf <>, Jann Horn <>, 
	"Perla, Enrico" <>, Ingo Molnar <>, 
	Borislav Petkov <>, Thomas Gleixner <>, Peter Zijlstra <>, 
	Greg KH <>
Subject: Re: [RFC PATCH] x86/entry/64: randomize kernel stack offset upon syscall

On Thu, Apr 4, 2019 at 4:41 AM Reshetova, Elena
<> wrote:
> What I still don't fully understand here (due to my little knowledge of
> compilers) and afraid of is that the asm code that alloca generates (see my version)
> and the alignment might differ on the different targets, etc.

I guess it's possible, but for x86_64, since appears to be consistent.

> If you tried it on yours, can you send me the asm code that it produced for you?
> Is it different from mine?

You can compare compiler outputs here. Here's gcc vs clang for this code:
You can adjust compiler versions, etc.

Kees Cook

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