[PATCH] x86/x86_64: mark rodata section read only: x86 parts

x86 specific parts to make the .rodata section read only

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/i386/Kconfig.debug b/arch/i386/Kconfig.debug
index c48b424dd640..bf32ecc9ad04 100644
--- a/arch/i386/Kconfig.debug
+++ b/arch/i386/Kconfig.debug
@@ -42,6 +42,16 @@ config DEBUG_PAGEALLOC
           This results in a large slowdown, but helps to find certain types
           of memory corruptions.
 
+config DEBUG_RODATA
+        bool "Write protect kernel read-only data structures"
+        depends on DEBUG_KERNEL
+        help
+          Mark the kernel read-only data as write-protected in the pagetables,
+          in order to catch accidental (and incorrect) writes to such const
+          data. This option may have a slight performance impact because a
+          portion of the kernel code won't be covered by a 2MB TLB anymore.
+          If in doubt, say "N".
+
 config 4KSTACKS
         bool "Use 4Kb for kernel stacks instead of 8Kb"
         depends on DEBUG_KERNEL