diff options
| -rw-r--r-- | mm/mremap.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/mm/mremap.c b/mm/mremap.c index 9d0753983dcb..84efffb2d2c4 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -325,6 +325,7 @@ static unsigned long mremap_to(unsigned long addr, struct vm_area_struct *vma; unsigned long ret = -EINVAL; unsigned long charged = 0; + unsigned long map_flags; if (new_addr & ~PAGE_MASK) goto out; @@ -362,9 +363,23 @@ static unsigned long mremap_to(unsigned long addr, goto out; } - ret = move_vma(vma, addr, old_len, new_len, new_addr); + map_flags = MAP_FIXED; + if (vma->vm_flags & VM_MAYSHARE) + map_flags |= MAP_SHARED; + ret = arch_mmap_check(new_addr, new_len, map_flags); + if (ret) + goto out1; + ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff + + ((addr - vma->vm_start) >> PAGE_SHIFT), + map_flags); if (ret & ~PAGE_MASK) - vm_unacct_memory(charged); + goto out1; + + ret = move_vma(vma, addr, old_len, new_len, new_addr); + if (!(ret & ~PAGE_MASK)) + goto out; +out1: + vm_unacct_memory(charged); out: return ret; |