linux-kernel - Re: [PATCH v2 5/8] x86/kaslr: Simplify __process_mem

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Date:   Tue, 28 Jul 2020 15:42:06 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Kees Cook <keescook@...omium.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/8] x86/kaslr: Simplify __process_mem_region

On Tue, Jul 28, 2020 at 12:25:16PM -0700, Kees Cook wrote:
> On Mon, Jul 27, 2020 at 07:07:58PM -0400, Arvind Sankar wrote:
> > Get rid of unnecessary temporary variables and redundant tests in
> > __process_mem_region.
> > 
> > Fix one minor bug: in case of an overlap, the beginning of the region
> > should be used even if it is exactly image_size, not just strictly
> > larger.
> > 
> > Change type of minimum/image_size arguments in process_mem_region to
> > unsigned long. These actually can never be above 4G (even on x86_64),
> > and they're unsigned long in every other function except this one.
> > 
> > Signed-off-by: Arvind Sankar <nivedita@...m.mit.edu>
> 
> Please split this up (which I think is already planned):
> 
> - bug fix (which looks like a correct fix to me)
> - arg type size changes
> - refactoring
> 
> I don't currently agree that the refactoring makes things easier to
> read, but let's see v3. :)
> 
> -- 
> Kees Cook

Yep