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vm audit: add VM_DONTEXPAND to mmap for drivers that need it

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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 <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nick Piggin 2008-02-02 03:08:53 +01:00 • committed by Linus Torvalds
commit 2f98735c9c
8 changed files with 13 additions and 16 deletions
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2
mm/mmap.c
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@ -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;