From: Roger Pau Monne roger.pau@citrix.com
commit 307c8de2b02344805ebead3440d8feed28f2f010 upstream.
When allocating pages to be used for shared communication with the backend always zero them, this avoids leaking unintended data present on the pages.
This is CVE-2022-33740, part of XSA-403.
Signed-off-by: Roger Pau Monné roger.pau@citrix.com Reviewed-by: Jan Beulich jbeulich@suse.com Reviewed-by: Juergen Gross jgross@suse.com Signed-off-by: Juergen Gross jgross@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/xen-netfront.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -261,7 +261,7 @@ static struct sk_buff *xennet_alloc_one_ if (unlikely(!skb)) return NULL;
- page = alloc_page(GFP_ATOMIC | __GFP_NOWARN); + page = alloc_page(GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO); if (!page) { kfree_skb(skb); return NULL;