From 1e0fc9d1eb2b0241a03e0a02bcdb9b5b641b9d35 Mon Sep 17 00:00:00 2001 From: Balbir Singh Date: Thu, 29 Jun 2017 03:04:11 +1000 Subject: [PATCH] powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs All code that patches kernel text has been moved over to using patch_instruction() and patch_instruction() is able to cope with the kernel text being read only. The linker script has been updated to ensure the read only data ends on a large page boundary, so it and the preceding kernel text can be marked R_X. We also have implementations of mark_rodata_ro() for Hash and Radix MMU modes. There are some corner-cases missing when the kernel is built relocatable, so for now make it depend on !RELOCATABLE. There's also a temporary workaround to depend on !HIBERNATION to avoid a build failure, that will be removed once we've merged with the PM tree. Signed-off-by: Balbir Singh [mpe: Make it depend on !RELOCATABLE, munge change log] Signed-off-by: Michael Ellerman --- arch/powerpc/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 5ef763853876..8998eefe1638 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -164,6 +164,8 @@ config PPC select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK + select ARCH_HAS_STRICT_KERNEL_RWX if (PPC_BOOK3S_64 && !RELOCATABLE && !HIBERNATION) + select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select HAVE_CBPF_JIT if !PPC64 select HAVE_CONTEXT_TRACKING if PPC64 select HAVE_DEBUG_KMEMLEAK -- 2.20.1