From a2172e2586f6662af996e47f417bb718c37cf8d2 Mon Sep 17 00:00:00 2001 From: "Huang, Ying" Date: Wed, 30 Jan 2008 13:33:55 +0100 Subject: x86: fix some bugs about EFI runtime code mapping This patch fixes some bugs of making EFI runtime code executable. - Use change_page_attr in i386 too. Because the runtime code may be mapped not through ioremap. - If there is no _PAGE_NX in __supported_pte_mask, the change_page_attr is not called. - Make efi_ioremap map pages as PAGE_KERNEL_EXEC_NOCACHE, because EFI runtime code may be mapped through efi_ioremap. Signed-off-by: Huang Ying Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/efi_64.c | 26 ++++++-------------------- 1 file changed, 6 insertions(+), 20 deletions(-) (limited to 'arch/x86/kernel/efi_64.c') diff --git a/arch/x86/kernel/efi_64.c b/arch/x86/kernel/efi_64.c index 1f8bbd9644d7..9f8a75594398 100644 --- a/arch/x86/kernel/efi_64.c +++ b/arch/x86/kernel/efi_64.c @@ -33,7 +33,6 @@ #include #include #include -#include #include #include @@ -55,7 +54,7 @@ static void __init early_mapping_set_exec(unsigned long start, else set_pte(kpte, __pte((pte_val(*kpte) | _PAGE_NX) & \ __supported_pte_mask)); - if (pte_huge(*kpte)) + if (level == 4) start = (start + PMD_SIZE) & PMD_MASK; else start = (start + PAGE_SIZE) & PAGE_MASK; @@ -67,6 +66,9 @@ static void __init early_runtime_code_mapping_set_exec(int executable) efi_memory_desc_t *md; void *p; + if (!(__supported_pte_mask & _PAGE_NX)) + return; + /* Make EFI runtime service code area executable */ for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { md = p; @@ -116,22 +118,6 @@ void __init efi_reserve_bootmem(void) memmap.nr_map * memmap.desc_size); } -void __init runtime_code_page_mkexec(void) -{ - efi_memory_desc_t *md; - void *p; - - /* Make EFI runtime service code area executable */ - for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { - md = p; - if (md->type == EFI_RUNTIME_SERVICES_CODE) - change_page_attr_addr(md->virt_addr, - md->num_pages, - PAGE_KERNEL_EXEC); - } - __flush_tlb_all(); -} - void __iomem * __init efi_ioremap(unsigned long offset, unsigned long size) { @@ -146,8 +132,8 @@ void __iomem * __init efi_ioremap(unsigned long offset, return NULL; for (i = 0; i < pages; i++) { - set_fixmap_nocache(FIX_EFI_IO_MAP_FIRST_PAGE - pages_mapped, - offset); + __set_fixmap(FIX_EFI_IO_MAP_FIRST_PAGE - pages_mapped, + offset, PAGE_KERNEL_EXEC_NOCACHE); offset += PAGE_SIZE; pages_mapped++; } -- cgit v1.2.1