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Message-Id: <20220705115621.199811906@linuxfoundation.org>
Date: Tue, 5 Jul 2022 13:59:04 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Roger Pau Monné <roger.pau@...rix.com>,
Jan Beulich <jbeulich@...e.com>,
Juergen Gross <jgross@...e.com>
Subject: [PATCH 5.18 098/102] xen/netfront: fix leaking data in shared pages
From: Roger Pau Monne <roger.pau@...rix.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@...rix.com>
Reviewed-by: Jan Beulich <jbeulich@...e.com>
Reviewed-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Juergen Gross <jgross@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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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