From 2f98735c9c24ea1f0d40a364d4e63611b689b795 Mon Sep 17 00:00:00 2001 From: Nick Piggin Date: Sat, 2 Feb 2008 03:08:53 +0100 Subject: vm audit: add VM_DONTEXPAND to mmap for drivers that need it Drivers that register a ->fault handler, but do not range-check the offset argument, must set VM_DONTEXPAND in the vm_flags in order to prevent an expanding mremap from overflowing the resource. I've audited the tree and attempted to fix these problems (usually by adding VM_DONTEXPAND where it is not obvious). Signed-off-by: Nick Piggin Signed-off-by: Linus Torvalds --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm/mmap.c') diff --git a/mm/mmap.c b/mm/mmap.c index d2b6d44962b7..8295577a83b2 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2216,7 +2216,7 @@ int install_special_mapping(struct mm_struct *mm, vma->vm_start = addr; vma->vm_end = addr + len; - vma->vm_flags = vm_flags | mm->def_flags; + vma->vm_flags = vm_flags | mm->def_flags | VM_DONTEXPAND; vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); vma->vm_ops = &special_mapping_vmops; -- cgit v1.2.3