linux-kernel - Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy support

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Message-ID: <alpine.DEB.2.20.1607080844370.3379@east.gentwo.org>
Date:	Fri, 8 Jul 2016 08:45:54 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Michael Ellerman <mpe@...erman.id.au>
cc:	Kees Cook <keescook@...omium.org>,
	"kernel-hardening@...ts.openwall.com" 
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	"David S. Miller" <davem@...emloft.net>
Subject: Re: [kernel-hardening] Re: [PATCH 9/9] mm: SLUB hardened usercopy
 support

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.