[patch 38/58] agp: zero pages before sending to userspace

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

upstream commit: 59de2bebabc5027f93df999d59cc65df591c3e6e

CVE-2009-1192

AGP pages might be mapped into userspace finally, so the pages should be
set to zero before userspace can use it. Otherwise there is potential
information leakage.

Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/char/agp/generic.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -1207,7 +1207,7 @@ void *agp_generic_alloc_page(struct agp_
 {
 	struct page * page;
 
-	page = alloc_page(GFP_KERNEL | GFP_DMA32);
+	page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
 	if (page == NULL)
 		return NULL;
 


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