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xen/netfront: fix leaking data in shared pages

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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>
This commit is contained in:
Roger Pau Monne 2022-04-06 17:38:04 +02:00 committed by Greg Kroah-Hartman
parent 4fbda9d1fc
commit d1d69e0c83
1 changed files with 1 additions and 1 deletions
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2
drivers/net/xen-netfront.c
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@ -260,7 +260,7 @@ static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
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;