Someone setting NX on the kernel text tends to result in nasty failures
and triple faults, so BUG_ON early for that.
Does not cover __inittext.
Signed-off-by: Andi Kleen <[EMAIL PROTECTED]>
Acked-by: Jan Beulich <[EMAIL PROTECTED]>
---
arch/x86/mm/pageattr_32.c | 8 ++++++++
1 file changed, 8 insertions(+)
Index: linux/arch/x86/mm/pageattr_32.c
===================================================================
--- linux.orig/arch/x86/mm/pageattr_32.c
+++ linux/arch/x86/mm/pageattr_32.c
@@ -242,6 +242,14 @@ __change_page_attr(struct page *page, pg
BUG_ON(PageLRU(kpte_page));
BUG_ON(PageCompound(kpte_page));
+ /*
+ * Better fail early if someone sets the kernel text to NX.
+ * Does not cover __inittext
+ */
+ BUG_ON(address >= (unsigned long)&_text &&
+ address < (unsigned long)&_etext &&
+ (pgprot_val(prot) & _PAGE_NX));
+
set_tlb_flush(address, cache_attr_changed(*kpte, prot, level),
level < 3);
--
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