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authorDavid S. Miller <davem@sunset.davemloft.net>2005-12-24 12:06:10 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2005-12-24 12:06:10 -0800
commite445ee65cbefaa19131c972ae7fe221c95cf4cc4 (patch)
tree2f7e4639069e3a1c5a5457d6fc879f02f0e9977c /drivers/video/sbuslib.c
parent597d1f0622d21ffe54aceef8da9682e776f51cc2 (diff)
[VIDEO] sbuslib: Disallow private mmaps.
The COW semantics just do not make any sense especially with the physically discontiguous I/O mappings possible here. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/video/sbuslib.c')
-rw-r--r--drivers/video/sbuslib.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/sbuslib.c b/drivers/video/sbuslib.c
index 646c43f921c..3a74a63dd4f 100644
--- a/drivers/video/sbuslib.c
+++ b/drivers/video/sbuslib.c
@@ -46,6 +46,9 @@ int sbusfb_mmap_helper(struct sbus_mmap_map *map,
unsigned long off;
int i;
+ if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
+ return -EINVAL;
+
size = vma->vm_end - vma->vm_start;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;