Re: [PATCH] powerpc: Default to enabling STRICT_KERNEL_RWX

2017-10-05 Thread Kees Cook
On Thu, Oct 5, 2017 at 11:57 AM, christophe leroy wrote: > > > Le 05/10/2017 à 19:30, Kees Cook a écrit : >> >> On Thu, Oct 5, 2017 at 12:49 AM, Christophe LEROY >> wrote: >>> >>> >>> >>> Le 05/10/2017 à 05:45, Kees Cook a écrit : When available, CONFIG_KERNEL_RWX should be default

Re: [PATCH] powerpc: Default to enabling STRICT_KERNEL_RWX

2017-10-05 Thread christophe leroy
Le 05/10/2017 à 19:30, Kees Cook a écrit : On Thu, Oct 5, 2017 at 12:49 AM, Christophe LEROY wrote: 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

Re: [PATCH] powerpc: Default to enabling STRICT_KERNEL_RWX

2017-10-05 Thread Kees Cook
On Thu, Oct 5, 2017 at 12:49 AM, Christophe LEROY wrote: > > > 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 signi

Re: [PATCH] powerpc: Default to enabling STRICT_KERNEL_RWX

2017-10-05 Thread Christophe LEROY
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 rema

[PATCH] powerpc: Default to enabling STRICT_KERNEL_RWX

2017-10-04 Thread Kees Cook
When available, CONFIG_KERNEL_RWX should be default-enabled. Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Cc: linuxppc-...@lists.ozlabs.org Signed-off-by: Kees Cook --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/p