netdev - Re: [PATCH] nf_conntrack: avoid kernel pointer value leak in slab name

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Message-ID: <CA+55aFxRg36qT9HSY9QgCV-8hhxD83Pa_kVyP=G+pa3iYBxj8g@mail.gmail.com>
Date:	Sun, 15 May 2016 11:05:16 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Willy Tarreau <w@....eu>,
	Network Development List <netdev@...r.kernel.org>
Subject: Re: [PATCH] nf_conntrack: avoid kernel pointer value leak in slab name

On Sat, May 14, 2016 at 2:31 PM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> "u64" is indeed "unsigned long long" on x86 and many other
> architectures, but on alpha and ia64 it's just "unsigned long".

Actually, I take that back.

In the kernel, it seems to always be "unsigned long long", even on
alpha and ia64.

We do have a "int-l64.h" file that typedef's __u64 to be just unsigned
long, and yes, that file is included for alpha and ia64, but it seems
that that only happens when __KERNEL__ is not defined.

So it does seem like using "%ull" and u64 is fine. Not in general, but
inside the kernel it's ok.

              Linus