linux-kernel - Re: [PATCH 08/11] x86: make TASK_SIZE

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Date:   Tue, 18 Aug 2020 21:55:39 +0200
From:   Christoph Hellwig <hch@....de>
To:     Kees Cook <keescook@...omium.org>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        Michael Ellerman <mpe@...erman.id.au>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 08/11] x86: make TASK_SIZE_MAX usable from assembly code

On Tue, Aug 18, 2020 at 12:44:49PM -0700, Kees Cook wrote:
> On Mon, Aug 17, 2020 at 09:32:09AM +0200, Christoph Hellwig wrote:
> > For 64-bit the only hing missing was a strategic _AC, and for 32-bit we
> 
> typo: thing
> 
> > need to use __PAGE_OFFSET instead of PAGE_OFFSET in the TASK_SIZE
> > definition to escape the explicit unsigned long cast.  This just works
> > because __PAGE_OFFSET is defined using _AC itself and thus never needs
> > the cast anyway.
> 
> Shouldn't this be folded into the prior patch so there's no bisection
> problem?

I didn't see a problem bisecting, do you have something particular in
mind?