linux-kernel - Re: [kernel-hardening] Re: [PATCH v3 00/13] Virtually mapped stacks with guard pages (x86, core)

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Message-ID: <1466533189.2756.52.camel@redhat.com>
Date:	Tue, 21 Jun 2016 14:19:49 -0400
From:	Rik van Riel <riel@...hat.com>
To:	kernel-hardening@...ts.openwall.com,
	Andy Lutomirski <luto@...capital.net>,
	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>,
	Nadav Amit <nadav.amit@...il.com>,
	Brian Gerst <brgerst@...il.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jann Horn <jann@...jh.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [kernel-hardening] Re: [PATCH v3 00/13] Virtually mapped stacks
 with guard pages (x86, core)

On Tue, 2016-06-21 at 11:12 -0700, Kees Cook wrote:
> On Tue, Jun 21, 2016 at 10:27 AM, Andy Lutomirski
> <luto@...capital.net> wrote:
> > FWIW, it may be a while before this can be enabled in distro
> > kernels.
> > There are some code paths (*cough* crypto users *cough*) that think
> > that calling sg_init_one with a stack address is a reasonable thing
> > to
> > do, and it doesn't work with a vmalloced stack.  grsecurity works
> ... O_o ...
> 
> Why does it not work on a vmalloced stack??

Because virt_to_page() does not work on vmalloced
memory.

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