>From 8e4bdefe9649a89c972974d94510f0c2bd2d0ea4 Mon Sep 17 00:00:00 2001 From: Matthieu CASTET Date: Thu, 27 Jan 2011 21:36:07 +0100 Subject: [PATCH] NX protection for kernel data : fix 32 bits wakeup 32 bits wakeup realmode trampoline enable paging, while still in low memory. We should make this memory !NX in order it works. Signed-off-by: Matthieu CASTET Tested-by: Matthias Hopf --- arch/x86/mm/init_32.c | 8 ++++++++ arch/x86/mm/pageattr.c | 7 +++++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index c821074..0048738 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -227,6 +227,14 @@ page_table_range_init(unsigned long start, unsigned long end, pgd_t *pgd_base) static inline int is_kernel_text(unsigned long addr) { +#if defined(CONFIG_X86_32) && defined(CONFIG_ACPI_SLEEP) + /* + * We need to make the wakeup trampoline in first 1MB !NX + */ + if (addr >= PAGE_OFFSET && addr <= (PAGE_OFFSET + (1<<20))) + return 1; +#endif + if (addr >= (unsigned long)_text && addr <= (unsigned long)__init_end) return 1; return 0; diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c index d343b3c..f1d6cf5 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -265,6 +265,13 @@ static inline pgprot_t static_protections(pgprot_t prot, unsigned long address, if (pcibios_enabled && within(pfn, BIOS_BEGIN >> PAGE_SHIFT, BIOS_END >> PAGE_SHIFT)) pgprot_val(forbidden) |= _PAGE_NX; #endif + /* + * We need to make the wakeup trampoline in first 1MB !NX + */ +#if defined(CONFIG_X86_32) && defined(CONFIG_ACPI_SLEEP) + if (within(address, PAGE_OFFSET, PAGE_OFFSET + (1<<20))) + pgprot_val(forbidden) |= _PAGE_NX; +#endif /* * The kernel text needs to be executable for obvious reasons -- 1.7.2.3