diff options
| author | Paul Mackerras <paulus@samba.org> | 2009-04-06 17:21:10 +0000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2009-04-07 15:19:01 +1000 |
| commit | 11b55da700eb77905f1c2dde3a0cbeedc665a753 (patch) | |
| tree | a99df58800151b3503a24424550fad55c160b6e1 /arch | |
| parent | 1a917bb549deb0b6bcb0321db22e9c27525a1e3d (diff) | |
| download | lwn-11b55da700eb77905f1c2dde3a0cbeedc665a753.tar.gz lwn-11b55da700eb77905f1c2dde3a0cbeedc665a753.zip | |
powerpc: Fix oops when loading modules
This fixes a problem reported by Sean MacLennan where loading any
module would cause an oops. We weren't marking the pages containing
the module text as having hardware execute permission, due to a bug
introduced in commit 8d1cf34e ("powerpc/mm: Tweak PTE bit combination
definitions"), hence trying to execute the module text caused an
exception on processors that support hardware execute permission.
This adds _PAGE_HWEXEC to the definitions of PAGE_KERNEL_X and
PAGE_KERNEL_ROX to fix this problem.
Reported-by: Sean MacLennan <smaclennan@pikatech.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/pte-common.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h index d9740e886801..a7e210b6b48c 100644 --- a/arch/powerpc/include/asm/pte-common.h +++ b/arch/powerpc/include/asm/pte-common.h @@ -151,9 +151,11 @@ extern unsigned long bad_call_to_PMD_PAGE_SIZE(void); _PAGE_NO_CACHE) #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \ _PAGE_NO_CACHE | _PAGE_GUARDED) -#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC) +#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW | _PAGE_EXEC | \ + _PAGE_HWEXEC) #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO) -#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC) +#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO | _PAGE_EXEC | \ + _PAGE_HWEXEC) /* Protection used for kernel text. We want the debuggers to be able to * set breakpoints anywhere, so don't write protect the kernel text |