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 <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: [email protected] Signed-off-by: Kees Cook <[email protected]> --- 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
