Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy support
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- To: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
- Subject: Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy support
- From: Christoph Lameter <cl@xxxxxxxxx>
- Date: Fri, 8 Jul 2016 08:45:54 -0500 (CDT)
- Cc: Kees Cook <keescook@xxxxxxxxxxxx>, "kernel-hardening@xxxxxxxxxxxxxxxxxx" <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, sparclinux <sparclinux@xxxxxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, Andrea Arcangeli <aarcange@xxxxxxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxx>, PaX Team <pageexec@xxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxx>, lin <ux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, Mathias Krause <minipli@xxxxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>, Brad Spengler <spender@xxxxxxxxxxxxxx>, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Pekka Enberg <penberg@xxxxxxxxxx>, Case y Schauf ler <casey@xxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "linuxppc-dev@xxxxxxxxxxxxxxxx" <linuxppc-dev@xxxxxxxxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>
- In-reply-to: <577f7e55.4668420a.84f17.5cb9SMTPIN_ADDED_MISSING@mx.google.com>
- List-id: <linux-ia64.vger.kernel.org>
- References: <577f7e55.4668420a.84f17.5cb9SMTPIN_ADDED_MISSING@mx.google.com>
On Fri, 8 Jul 2016, Michael Ellerman wrote:
> > I wonder if this code should be using size_from_object() instead of s->size?
>
> Hmm, not sure. Who's SLUB maintainer? :)
Me.
s->size is the size of the whole object including debugging info etc.
ksize() gives you the actual usable size of an object.
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