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Date: Wed, 16 Jan 2008 23:15:34 +0100 (CET) From: Andi Kleen <ak@...e.de> To: linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de, jbeulich@...ell.com, venkatesh.pallipadi@...el.com Subject: [PATCH] [34/36] CPA: Add a BUG_ON checking for someone setting the kernel text NX 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 <ak@...e.de> Acked-by: Jan Beulich <jbeulich@...ell.com> --- 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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