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authorNick Piggin <npiggin@suse.de>2008-02-02 03:08:53 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-02-04 07:55:38 -0800
commit2f98735c9c24ea1f0d40a364d4e63611b689b795 (patch)
treea42b3802449af474d36cda3b6f9fb190a717defb /fs
parentfe2528b96b02173395f5a75e37714c07f3e25e73 (diff)
downloadop-kernel-dev-2f98735c9c24ea1f0d40a364d4e63611b689b795.zip
op-kernel-dev-2f98735c9c24ea1f0d40a364d4e63611b689b795.tar.gz
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 <npiggin@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/ncpfs/mmap.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/ncpfs/mmap.c b/fs/ncpfs/mmap.c
index a94473d..5d8dcb9 100644
--- a/fs/ncpfs/mmap.c
+++ b/fs/ncpfs/mmap.c
@@ -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;
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