lkml.org 
[lkml]   [2017]   [Oct]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] powerpc: Default to enabling STRICT_KERNEL_RWX
From
Date


Le 05/10/2017 à 05:45, Kees Cook a écrit :
> When available, CONFIG_KERNEL_RWX should be default-enabled.

On PPC32, this option implies deactivating BATs and/or LTLB mapping of
the linear kernel address space, hence a significant performance
degradation.

So at least on PPC32, it should remain unselected by default.

Christophe

>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> arch/powerpc/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 809c468edab1..9a549bbfc278 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -178,6 +178,7 @@ config PPC
> select HAVE_ARCH_TRACEHOOK
> select ARCH_HAS_STRICT_KERNEL_RWX if ((PPC_BOOK3S_64 || PPC32) && !RELOCATABLE && !HIBERNATION)
> select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
> + select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
> select HAVE_CBPF_JIT if !PPC64
> select HAVE_CONTEXT_TRACKING if PPC64
> select HAVE_DEBUG_KMEMLEAK
>

\
 
 \ /
  Last update: 2017-10-05 09:50    [W:0.044 / U:4.364 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site