| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 79/98] xen/netfront: fix leaking data in shared pages | Date | Tue, 5 Jul 2022 13:58:37 +0200 |
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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 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -273,7 +273,8 @@ static struct sk_buff *xennet_alloc_one_ 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;
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