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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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4
fs/ncpfs/mmap.c
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@ -50,10 +50,6 @@ static int ncp_file_mmap_fault(struct vm_area_struct *area,
pos = vmf->pgoff << PAGE_SHIFT;
count = PAGE_SIZE;
if ((unsigned long)vmf->virtual_address + PAGE_SIZE > area->vm_end) {
WARN_ON(1); /* shouldn't happen? */
count = area->vm_end - (unsigned long)vmf->virtual_address;
}
/* what we can read in one go */
bufsize = NCP_SERVER(inode)->buffer_size;