1 files changed, 7 insertions, 9 deletions

diff --git a/mm/mmap.c b/mm/mmap.c
index ab199dfc9e26..5a6baddde15d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -179,14 +179,12 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
                 goto error;
         }
 
-        allowed = (totalram_pages - hugetlb_total_pages())
-                * sysctl_overcommit_ratio / 100;
+        allowed = vm_commit_limit();
         /*
          * Reserve some for root
          */
         if (!cap_sys_admin)
                 allowed -= sysctl_admin_reserve_kbytes >> (PAGE_SHIFT - 10);
-        allowed += total_swap_pages;
 
         /*
          * Don't let a single process grow so big a user can't recover
@@ -1856,7 +1854,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
         struct vm_area_struct *vma;
         struct vm_unmapped_area_info info;
 
-        if (len > TASK_SIZE)
+        if (len > TASK_SIZE - mmap_min_addr)
                 return -ENOMEM;
 
         if (flags & MAP_FIXED)
@@ -1865,14 +1863,14 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
         if (addr) {
                 addr = PAGE_ALIGN(addr);
                 vma = find_vma(mm, addr);
-                if (TASK_SIZE - len >= addr &&
+                if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
                     (!vma || addr + len <= vma->vm_start))
                         return addr;
         }
 
         info.flags = 0;
         info.length = len;
-        info.low_limit = TASK_UNMAPPED_BASE;
+        info.low_limit = mm->mmap_base;
         info.high_limit = TASK_SIZE;
         info.align_mask = 0;
         return vm_unmapped_area(&info);
@@ -1895,7 +1893,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         struct vm_unmapped_area_info info;
 
         /* requested length too big for entire address space */
-        if (len > TASK_SIZE)
+        if (len > TASK_SIZE - mmap_min_addr)
                 return -ENOMEM;
 
         if (flags & MAP_FIXED)
@@ -1905,14 +1903,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
         if (addr) {
                 addr = PAGE_ALIGN(addr);
                 vma = find_vma(mm, addr);
-                if (TASK_SIZE - len >= addr &&
+                if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
                                 (!vma || addr + len <= vma->vm_start))
                         return addr;
         }
 
         info.flags = VM_UNMAPPED_AREA_TOPDOWN;
         info.length = len;
-        info.low_limit = PAGE_SIZE;
+        info.low_limit = max(PAGE_SIZE, mmap_min_addr);
         info.high_limit = mm->mmap_base;
         info.align_mask = 0;
         addr = vm_unmapped_area(&info);