From: Ingo Molnar <mingo@elte.hu>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Siarhei Liakh <sliakh.lkml@gmail.com>,
linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
James Morris <jmorris@namei.org>,
Andrew Morton <akpm@linux-foundation.org>, Andi Kleen <ak@muc.de>,
Rusty Russell <rusty@rustcorp.com.au>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
David Howells <dhowells@redhat.com>,
Aristeu Rozanski <aris@redhat.com>
Subject: Re: [PATCH V5] x86: NX protection for kernel data
Date: Tue, 13 Oct 2009 16:15:27 +0200 [thread overview]
Message-ID: <20091013141527.GA7053@elte.hu> (raw)
In-Reply-To: <20091013070722.6e27b25e@infradead.org>
* Arjan van de Ven <arjan@infradead.org> wrote:
> On Tue, 13 Oct 2009 07:35:28 -0400
> Siarhei Liakh <sliakh.lkml@gmail.com> wrote:
>
> > ---[ Kernel Mapping ]---
> > 0xc0000000-0xc0100000 1M RW GLB x pte
> > -0xc0100000-0xc048d000 3636K ro GLB x pte
> > -0xc048d000-0xc04d0000 268K RW GLB x pte
> > -0xc04d0000-0xc04d2000 8K RW GLB NX pte
> > -0xc04d2000-0xc04d3000 4K RW GLB x pte
> > -0xc04d3000-0xc0531000 376K RW GLB NX pte
> > -0xc0531000-0xc0600000 828K RW GLB x pte
> > +0xc0100000-0xc0381000 2564K ro GLB x pte
> > +0xc0381000-0xc048d000 1072K ro GLB NX pte
> > +0xc048d000-0xc0600000 1484K RW GLB NX pte
> > 0xc0600000-0xf7800000 882M RW PSE GLB NX pmd
> > 0xf7800000-0xf79fe000 2040K RW GLB NX pte
> > 0xf79fe000-0xf7a00000 8K pte
> > ===============================================
> >
>
> looks great to me; the result is
> * kernel is ro + x
> * rodata is ro + NX
> * data is RW + NX
>
> (and there is no "RW + x", other than the first megabyte... hmm. maybe
> we need to look at that as well at some point)
Could we cover the first megabyte too please via a (default-disabled)
option? Modern Xorg shouldnt mind about that anymore, right?
Ingo
next prev parent reply other threads:[~2009-10-13 14:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-13 1:03 [PATCH V5] x86: NX protection for kernel data Siarhei Liakh
2009-10-13 4:32 ` Arjan van de Ven
2009-10-13 6:03 ` Ingo Molnar
2009-10-13 11:35 ` Siarhei Liakh
2009-10-13 12:28 ` Ingo Molnar
2009-10-13 14:07 ` Arjan van de Ven
2009-10-13 14:15 ` Ingo Molnar [this message]
2009-10-13 14:29 ` Arjan van de Ven
2009-10-13 14:49 ` Alan Cox
2009-10-13 15:34 ` Siarhei Liakh
2009-10-13 14:35 ` Arjan van de Ven
2009-10-13 7:14 ` David Howells
2009-10-13 7:48 ` David Howells
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