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

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Message-ID: <CAHk-=wi28vwsG-JNJEz_kc=qwPkYtYfh_14eHOUZsaGESDBDBA@mail.gmail.com>
Date:   Thu, 16 Jun 2022 12:18:57 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Linux-MM <linux-mm@...ck.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-hardening@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Uladzislau Rezki <urezki@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] usercopy: use unsigned long instead of uintptr_t

On Thu, Jun 16, 2022 at 12:14 PM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> In that situation, we'd probably just see "long long" being 128-bit
> ("I32LP64LL128").

Looking around, it looks like people prefer "long long long" (or in
the kernel, just "u128") for this, because so many have already gotten
used to "long long" being 64-bit, and 32-bit architectures (where
"long" is 32-bit and "long long" is 64-bit) are still relevant enough
that people want to keep that.

             Linus