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authorAndi Kleen <ak@suse.de>2006-09-26 10:52:37 +0200
committerAndi Kleen <andi@basil.nowhere.org>2006-09-26 10:52:37 +0200
commitdf992848f5aa803fcacd2c5e7d67034bb89e3fa3 (patch)
tree649ee5888f71bdd4243599f73d9725118262d368 /arch/x86_64/mm
parentd3cf7f061521c78ad62e275eb6fbdc8f43fc75a7 (diff)
[PATCH] Fix pte_exec/mkexec and use it in change_page_attr()
Fix the pte_exec/mkexec page table accessor functions to really use the NX bit. Previously they only checked the USER bit, but weren't actually used for anything. Then use them in change_page_attr() to manipulate the NX bit properly. Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/x86_64/mm')
-rw-r--r--arch/x86_64/mm/pageattr.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86_64/mm/pageattr.c b/arch/x86_64/mm/pageattr.c
index 2685b1f3671..01591b649f4 100644
--- a/arch/x86_64/mm/pageattr.c
+++ b/arch/x86_64/mm/pageattr.c
@@ -190,10 +190,12 @@ int change_page_attr_addr(unsigned long address, int numpages, pgprot_t prot)
* lowmem */
if (__pa(address) < KERNEL_TEXT_SIZE) {
unsigned long addr2;
- pgprot_t prot2 = prot;
+ pgprot_t prot2;
addr2 = __START_KERNEL_map + __pa(address);
- pgprot_val(prot2) &= ~_PAGE_NX;
- err = __change_page_attr(addr2, pfn, prot2, PAGE_KERNEL_EXEC);
+ /* Make sure the kernel mappings stay executable */
+ prot2 = pte_pgprot(pte_mkexec(pfn_pte(0, prot)));
+ err = __change_page_attr(addr2, pfn, prot2,
+ PAGE_KERNEL_EXEC);
}
}
up_write(&init_mm.mmap_sem);