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authorDave Jones <davej@redhat.com>2006-01-06 00:12:10 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:38 -0800
commitf8af095d3a4c8300b4e63ee2c4bb198b565d9431 (patch)
tree8ca5c266790eb543706fd202d2d2f731466ad541
parente72c8585e09f127a69a1608bb5ccd1e3fc0dd41e (diff)
[PATCH] x86: change_page_attr() fix
The 'make rodata read-only' patch in -mm exposes a latent bug in the 32-bit change_page_attr() function, which causes certain CPUs (Those with NX basically) to reboot instantly after pages are marked read-only. The same bug got fixed a while back on x86-64, but never got propagated to i386. Stuart Hayes from Dell also picked up on this last June, but it never got fixed, as the only thing affected by it aparently was the nvidia driver. Blatantly stealing description from his post.. "It doesn't appear to be fixed (in the i386 arch). The change_page_attr()/split_large_page() code will still still set all the 4K PTEs to PAGE_KERNEL (setting the _PAGE_NX bit) when a large page needs to be split. This wouldn't be a problem for the bulk of the kernel memory, but there are pages in the lower 4MB of memory that's free, and are part of large executable pages that also contain kernel code. If change_page_attr() is called on these, it will set the _PAGE_NX bit on the whole 2MB region that was covered by the large page, causing a large chunk of kernel code to be non-executable." Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Dave Jones <davej@redhat.com> Cc: <Stuart_Hayes@Dell.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/mm/pageattr.c27
1 files changed, 21 insertions, 6 deletions
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index f600fc244f0..c30a16df644 100644
--- a/arch/i386/mm/pageattr.c
+++ b/arch/i386/mm/pageattr.c
@@ -13,6 +13,7 @@
#include <asm/processor.h>
#include <asm/tlbflush.h>
#include <asm/pgalloc.h>
+#include <asm/sections.h>
static DEFINE_SPINLOCK(cpa_lock);
static struct list_head df_list = LIST_HEAD_INIT(df_list);
@@ -36,7 +37,8 @@ pte_t *lookup_address(unsigned long address)
return pte_offset_kernel(pmd, address);
}
-static struct page *split_large_page(unsigned long address, pgprot_t prot)
+static struct page *split_large_page(unsigned long address, pgprot_t prot,
+ pgprot_t ref_prot)
{
int i;
unsigned long addr;
@@ -54,7 +56,7 @@ static struct page *split_large_page(unsigned long address, pgprot_t prot)
pbase = (pte_t *)page_address(base);
for (i = 0; i < PTRS_PER_PTE; i++, addr += PAGE_SIZE) {
set_pte(&pbase[i], pfn_pte(addr >> PAGE_SHIFT,
- addr == address ? prot : PAGE_KERNEL));
+ addr == address ? prot : ref_prot));
}
return base;
}
@@ -98,11 +100,18 @@ static void set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
*/
static inline void revert_page(struct page *kpte_page, unsigned long address)
{
- pte_t *linear = (pte_t *)
+ pgprot_t ref_prot;
+ pte_t *linear;
+
+ ref_prot =
+ ((address & LARGE_PAGE_MASK) < (unsigned long)&_etext)
+ ? PAGE_KERNEL_LARGE_EXEC : PAGE_KERNEL_LARGE;
+
+ linear = (pte_t *)
pmd_offset(pud_offset(pgd_offset_k(address), address), address);
set_pmd_pte(linear, address,
pfn_pte((__pa(address) & LARGE_PAGE_MASK) >> PAGE_SHIFT,
- PAGE_KERNEL_LARGE));
+ ref_prot));
}
static int
@@ -123,10 +132,16 @@ __change_page_attr(struct page *page, pgprot_t prot)
if ((pte_val(*kpte) & _PAGE_PSE) == 0) {
set_pte_atomic(kpte, mk_pte(page, prot));
} else {
- struct page *split = split_large_page(address, prot);
+ pgprot_t ref_prot;
+ struct page *split;
+
+ ref_prot =
+ ((address & LARGE_PAGE_MASK) < (unsigned long)&_etext)
+ ? PAGE_KERNEL_EXEC : PAGE_KERNEL;
+ split = split_large_page(address, prot, ref_prot);
if (!split)
return -ENOMEM;
- set_pmd_pte(kpte,address,mk_pte(split, PAGE_KERNEL));
+ set_pmd_pte(kpte,address,mk_pte(split, ref_prot));
kpte_page = split;
}
get_page(kpte_page);