3.6.11.9-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Russell King [ Upstream commit a5463cd3435475386cbbe7b06e01292ac169d36f ] 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 Signed-off-by: Steven Rostedt --- arch/arm/include/asm/page.h | 2 ++ arch/arm/kernel/process.c | 7 ++++++- arch/arm/mm/mmu.c | 4 ++++ 3 files changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index ecf9019..5c35852 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 diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c index 693b744..427ddbc 100644 --- a/arch/arm/kernel/process.c +++ b/arch/arm/kernel/process.c @@ -508,6 +508,7 @@ unsigned long arch_randomize_brk(struct mm_struct *mm) } #ifdef CONFIG_MMU +#ifdef CONFIG_KUSER_HELPERS /* * The vectors page is always readable from user space for the * atomic helpers and the signal restart code. Insert it into the @@ -540,9 +541,13 @@ int in_gate_area_no_mm(unsigned long addr) { return in_gate_area(NULL, addr); } +#define is_gate_vma(vma) ((vma) = &gate_vma) +#else +#define is_gate_vma(vma) 0 +#endif const char *arch_vma_name(struct vm_area_struct *vma) { - return (vma == &gate_vma) ? "[vectors]" : NULL; + return is_gate_vma(vma) ? "[vectors]" : NULL; } #endif diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 889f3de..50d4aff 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -1125,7 +1125,11 @@ static void __init devicemaps_init(struct machine_desc *mdesc) map.pfn = __phys_to_pfn(virt_to_phys(vectors)); map.virtual = 0xffff0000; map.length = PAGE_SIZE; +#ifdef CONFIG_KUSER_HELPERS map.type = MT_HIGH_VECTORS; +#else + map.type = MT_LOW_VECTORS; +#endif create_mapping(&map); if (!vectors_high()) { -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/