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Commit 1e0fc9d1 authored by Balbir Singh's avatar Balbir Singh Committed by Michael Ellerman
Browse files

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: default avatarBalbir Singh <bsingharora@gmail.com>
[mpe: Make it depend on !RELOCATABLE, munge change log]
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 7614ff32

arch/powerpc/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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