1 files changed, 21 insertions, 0 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index ab906b801047..03823e784f63 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -1009,3 +1009,24 @@ config ARCH_SUPPORTS_BIG_ENDIAN
         help
           This option specifies the architecture can support big endian
           operation.
+
+config ARM_KERNMEM_PERMS
+        bool "Restrict kernel memory permissions"
+        help
+          If this is set, kernel memory other than kernel text (and rodata)
+          will be made non-executable. The tradeoff is that each region is
+          padded to section-size (1MiB) boundaries (because their permissions
+          are different and splitting the 1M pages into 4K ones causes TLB
+          performance problems), wasting memory.
+
+config DEBUG_RODATA
+        bool "Make kernel text and rodata read-only"
+        depends on ARM_KERNMEM_PERMS
+        default y
+        help
+          If this is set, kernel text and rodata will be made read-only. This
+          is to help catch accidental or malicious attempts to change the
+          kernel's executable code. Additionally splits rodata from kernel
+          text so it can be made explicitly non-executable. This creates
+          another section-size padded region, so it can waste more memory
+          space while gaining the read-only protections.