From: Roger Pau Monne roger.pau@citrix.com
stable inclusion from stable-v5.10.129 commit 728d68bfe68d92eae1407b8a9edc7817d6227404 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5GLYP CVE: CVE-2022-33740
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=l...
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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 Signed-off-by: ChenXiaoSong chenxiaosong2@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Reviewed-by: Jason Yan yanaijie@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.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 a7ebf17f75a3..881bc68e5402 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -273,7 +273,8 @@ 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;