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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-07-31 22:58:56 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2013-08-01 15:31:58 +0200 |
| commit | a5463cd3435475386cbbe7b06e01292ac169d36f (patch) | |
| tree | 71a32103b6df2be4fac877c60cdda2d9fe46e3a5 /arch/arm/include/asm/page.h | |
| parent | ARM: move signal handlers into a vdso-like page (diff) | |
| download | linux-a5463cd3435475386cbbe7b06e01292ac169d36f.tar.xz linux-a5463cd3435475386cbbe7b06e01292ac169d36f.zip | |
ARM: make vectors page inaccessible from userspace
If kuser helpers are not provided by the kernel, disable user access to
the vectors page. With the kuser helpers gone, there is no reason for
this page to be visible to userspace.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/page.h')
| -rw-r--r-- | arch/arm/include/asm/page.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index 6363f3d1d505..4355f0ec44d6 100644 --- a/arch/arm/include/asm/page.h +++ b/arch/arm/include/asm/page.h @@ -142,7 +142,9 @@ extern void __cpu_copy_user_highpage(struct page *to, struct page *from, #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) extern void copy_page(void *to, const void *from); +#ifdef CONFIG_KUSER_HELPERS #define __HAVE_ARCH_GATE_AREA 1 +#endif #ifdef CONFIG_ARM_LPAE #include <asm/pgtable-3level-types.h> |