linux-kernel - Re: [PATCH 06/13] fork: Add generic vmalloced stack support

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Message-ID: <CAGXu5jJoKZWm_KW6hyMLgaqkTr2oAiuFx2Sm5aCOhnC_GWmLzQ@mail.gmail.com>
Date:	Thu, 16 Jun 2016 10:25:54 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Nadav Amit <nadav.amit@...il.com>,
	Brian Gerst <brgerst@...il.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 06/13] fork: Add generic vmalloced stack support

On Wed, Jun 15, 2016 at 5:28 PM, Andy Lutomirski <luto@...nel.org> wrote:
> If CONFIG_VMAP_STACK is selected, kernel stacks are allocated with
> vmalloc_node.
>
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  arch/Kconfig  | 12 ++++++++++++
>  kernel/fork.c | 45 +++++++++++++++++++++++++++++++++++++--------
>  2 files changed, 49 insertions(+), 8 deletions(-)
>
> diff --git a/arch/Kconfig b/arch/Kconfig
> index d794384a0404..1acd262036b0 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -658,4 +658,16 @@ config ARCH_NO_COHERENT_DMA_MMAP
>  config CPU_NO_EFFICIENT_FFS
>         def_bool n
>
> +config HAVE_ARCH_VMAP_STACK
> +       def_bool n

In the style of HAVE_ARCH_SECCOMP_FILTER, can you detail all the
things an architecture needs to do to correctly support a vmap stack?
This will help with arch porting.

-Kees

-- 
Kees Cook
Chrome OS & Brillo Security