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xen/netfront: fix leaking data in shared pages 

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>
This commit is contained in:
Roger Pau Monne 2022-04-06 17:38:04 +02:00 committed by Juergen Gross
parent 2f446ffe9d
commit 307c8de2b0
1 changed files with 2 additions and 1 deletions
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3
drivers/net/xen-netfront.c
View File

@ -271,7 +271,8 @@ static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue)
if (unlikely(!skb))
return NULL;
page = page_pool_dev_alloc_pages(queue->page_pool);
page = page_pool_alloc_pages(queue->page_pool,
GFP_ATOMIC | __GFP_NOWARN | __GFP_ZERO);
if (unlikely(!page)) {
kfree_skb(skb);
return NULL;