linux-hardening - Re: [PATCH] usercopy: use unsigned long instead of uintptr

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Date:   Thu, 16 Jun 2022 15:38:02 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        Uladzislau Rezki <urezki@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] usercopy: use unsigned long instead of uintptr_t

On Thu, Jun 16, 2022 at 04:36:17PM +0200, Jason A. Donenfeld wrote:
> A recent commit factored out a series of annoying (unsigned long) casts
> into a single variable declaration, but made the pointer type a
> `uintptr_t` rather than the usual `unsigned long`. This patch changes it
> to be the integer type more typically used by the kernel to represent
> addresses.

No.  I did this on purpose.  uintptr_t is the correct type to represent
a pointer that's being used as an integer.  This dinosaur approach of
using unsigned long has to stop.