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Date:   Wed, 27 Feb 2019 09:36:11 -0800
From:   Linus Torvalds <>
To:     Peter Zijlstra <>
Cc:     Thomas Gleixner <>, Peter Anvin <>,
        Julien Thierry <>,
        Will Deacon <>,
        Andy Lutomirski <>,
        Ingo Molnar <>,
        Catalin Marinas <>,
        James Morse <>,,
        Brian Gerst <>,
        Josh Poimboeuf <>,
        Andrew Lutomirski <>,
        Borislav Petkov <>,
        Denys Vlasenko <>,
        Linux List Kernel Mailing <>,
        Andrey Ryabinin <>,
        Alexander Potapenko <>,
        Dmitry Vyukov <>
Subject: Re: [PATCH 5/6] objtool: Add UACCESS validation

On Wed, Feb 27, 2019 at 9:30 AM Peter Zijlstra <> wrote:
> Right, but I was hoping to avoid having to do that; and I think we can
> do that if we push all of kasan_report into an exception, like that
> 'patch' I just posted.
> If I'm not mistaken the regular kasan house-keeping crud just prods at
> the shadow memory with simple code and should be perfectly safe.

Fair enough. I do agree it would be nice to not have the save/restore
simply because "it cannot matter" and we have the static tool to prove


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