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Message-ID: <CALCETrXBiBaiLG+JPs-f--ga1Ex8HLJa+_95vt6LCbU6RYqY5Q@mail.gmail.com>
Date: Thu, 16 Jun 2016 10:37:21 -0700
From: Andy Lutomirski <luto@...capital.net>
To: Kees Cook <keescook@...omium.org>
Cc: Andy Lutomirski <luto@...nel.org>,
"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 Thu, Jun 16, 2016 at 10:25 AM, Kees Cook <keescook@...omium.org> wrote:
> 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.
Done.
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