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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
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