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

[Andy Lutomirski]

On Thu, Jun 16, 2016 at 10:25 AM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> On Wed, Jun 15, 2016 at 5:28 PM, Andy Lutomirski <luto@xxxxxxxxxx> wrote:
>> If CONFIG_VMAP_STACK is selected, kernel stacks are allocated with
>> vmalloc_node.
>>
>> Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
>> ---
>>  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.