Patch-mainline: 5.19-rc6
Git-commit: 307c8de2b02344805ebead3440d8feed28f2f010
References: bsc#1200762, CVE-2022-33740, XSA-403
From: Roger Pau Monne <roger.pau@citrix.com>
Date: Wed, 6 Apr 2022 17:38:04 +0200
Subject: [PATCH] xen/netfront: fix leaking data in shared pages
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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>
---
drivers/net/xen-netfront.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 8c0b9546d5a2..e3165139629d 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -271,7 +271,7 @@ 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;
--
2.35.3