1 files changed, 9 insertions, 87 deletions

diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index 28adeabe851f..5d2a1225785b 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -7,6 +7,7 @@
  *   written by Ralf Baechle <ralf@linux-mips.org>
  */
 #include <linux/compiler.h>
+#include <linux/elf-randomize.h>
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/mman.h>
@@ -19,33 +20,6 @@
 unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */
 EXPORT_SYMBOL(shm_align_mask);
 
-/* gap between mmap and stack */
-#define MIN_GAP (128*1024*1024UL)
-#define MAX_GAP ((TASK_SIZE)/6*5)
-
-static int mmap_is_legacy(void)
-{
-	if (current->personality & ADDR_COMPAT_LAYOUT)
-		return 1;
-
-	if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
-		return 1;
-
-	return sysctl_legacy_va_layout;
-}
-
-static unsigned long mmap_base(unsigned long rnd)
-{
-	unsigned long gap = rlimit(RLIMIT_STACK);
-
-	if (gap < MIN_GAP)
-		gap = MIN_GAP;
-	else if (gap > MAX_GAP)
-		gap = MAX_GAP;
-
-	return PAGE_ALIGN(TASK_SIZE - gap - rnd);
-}
-
 #define COLOUR_ALIGN(addr, pgoff)				\
 	((((addr) + shm_align_mask) & ~shm_align_mask) +	\
 	 (((pgoff) << PAGE_SHIFT) & shm_align_mask))
@@ -60,7 +34,7 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 	struct vm_area_struct *vma;
 	unsigned long addr = addr0;
 	int do_color_align;
-	struct vm_unmapped_area_info info;
+	struct vm_unmapped_area_info info = {};
 
 	if (unlikely(len > TASK_SIZE))
 		return -ENOMEM;
@@ -118,14 +92,14 @@ static unsigned long arch_get_unmapped_area_common(struct file *filp,
 		 */
 	}
 
-	info.flags = 0;
 	info.low_limit = mm->mmap_base;
 	info.high_limit = TASK_SIZE;
 	return vm_unmapped_area(&info);
 }
 
 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr0,
-	unsigned long len, unsigned long pgoff, unsigned long flags)
+	unsigned long len, unsigned long pgoff, unsigned long flags,
+	vm_flags_t vm_flags)
 {
 	return arch_get_unmapped_area_common(filp,
 			addr0, len, pgoff, flags, UP);
@@ -137,71 +111,19 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr0,
  */
 unsigned long arch_get_unmapped_area_topdown(struct file *filp,
 	unsigned long addr0, unsigned long len, unsigned long pgoff,
-	unsigned long flags)
+	unsigned long flags, vm_flags_t vm_flags)
 {
 	return arch_get_unmapped_area_common(filp,
 			addr0, len, pgoff, flags, DOWN);
 }
 
-unsigned long arch_mmap_rnd(void)
-{
-	unsigned long rnd;
-
-#ifdef CONFIG_COMPAT
-	if (TASK_IS_32BIT_ADDR)
-		rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1);
-	else
-#endif /* CONFIG_COMPAT */
-		rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1);
-
-	return rnd << PAGE_SHIFT;
-}
-
-void arch_pick_mmap_layout(struct mm_struct *mm)
+bool __virt_addr_valid(const volatile void *kaddr)
 {
-	unsigned long random_factor = 0UL;
+	unsigned long vaddr = (unsigned long)kaddr;
 
-	if (current->flags & PF_RANDOMIZE)
-		random_factor = arch_mmap_rnd();
+	if ((vaddr < PAGE_OFFSET) || (vaddr >= MAP_BASE))
+		return false;
 
-	if (mmap_is_legacy()) {
-		mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
-		mm->get_unmapped_area = arch_get_unmapped_area;
-	} else {
-		mm->mmap_base = mmap_base(random_factor);
-		mm->get_unmapped_area = arch_get_unmapped_area_topdown;
-	}
-}
-
-static inline unsigned long brk_rnd(void)
-{
-	unsigned long rnd = get_random_long();
-
-	rnd = rnd << PAGE_SHIFT;
-	/* 8MB for 32bit, 256MB for 64bit */
-	if (TASK_IS_32BIT_ADDR)
-		rnd = rnd & 0x7ffffful;
-	else
-		rnd = rnd & 0xffffffful;
-
-	return rnd;
-}
-
-unsigned long arch_randomize_brk(struct mm_struct *mm)
-{
-	unsigned long base = mm->brk;
-	unsigned long ret;
-
-	ret = PAGE_ALIGN(base + brk_rnd());
-
-	if (ret < mm->brk)
-		return mm->brk;
-
-	return ret;
-}
-
-int __virt_addr_valid(const volatile void *kaddr)
-{
 	return pfn_valid(PFN_DOWN(virt_to_phys(kaddr)));
 }
 EXPORT_SYMBOL_GPL(__virt_addr_valid);