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Date: Wed, 31 Mar 2021 09:50:20 +0200
From: Thomas Gleixner <>
To: Kees Cook <>
Cc: Kees Cook <>, Elena Reshetova <>,, Andy Lutomirski <>, Peter Zijlstra <>, Catalin Marinas <>, Will Deacon <>, Mark Rutland <>, Alexander Potapenko <>, Alexander Popov <>, Ard Biesheuvel <>, Jann Horn <>, Vlastimil Babka <>, David Hildenbrand <>, Mike Rapoport <>, Andrew Morton <>, Jonathan Corbet <>, Randy Dunlap <>,,,,,
Subject: Re: [PATCH v8 4/6] x86/entry: Enable random_kstack_offset support

On Tue, Mar 30 2021 at 13:57, Kees Cook wrote:

> Allow for a randomized stack offset on a per-syscall basis, with roughly
> 5-6 bits of entropy, depending on compiler and word size. Since the
> method of offsetting uses macros, this cannot live in the common entry
> code (the stack offset needs to be retained for the life of the syscall,
> which means it needs to happen at the actual entry point).
> Signed-off-by: Kees Cook <>

Reviewed-by: Thomas Gleixner <>

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