From 9a564bccb78a76740ea9d75a259942df8143d02c Mon Sep 17 00:00:00 2001 From: Haimin Zhang Date: Tue, 8 Mar 2022 11:20:28 +0800 Subject: af_key: add __GFP_ZERO flag for compose_sadb_supported in function pfkey_register Add __GFP_ZERO flag for compose_sadb_supported in function pfkey_register to initialize the buffer of supp_skb to fix a kernel-info-leak issue. 1) Function pfkey_register calls compose_sadb_supported to request a sk_buff. 2) compose_sadb_supported calls alloc_sbk to allocate a sk_buff, but it doesn't zero it. 3) If auth_len is greater 0, then compose_sadb_supported treats the memory as a struct sadb_supported and begins to initialize. But it just initializes the field sadb_supported_len and field sadb_supported_exttype without field sadb_supported_reserved. Reported-by: TCS Robot Signed-off-by: Haimin Zhang Signed-off-by: Steffen Klassert --- net/key/af_key.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/key') diff --git a/net/key/af_key.c b/net/key/af_key.c index 9bf52a09b5ff..fd51db3be91c 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -1699,7 +1699,7 @@ static int pfkey_register(struct sock *sk, struct sk_buff *skb, const struct sad xfrm_probe_algs(); - supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); + supp_skb = compose_sadb_supported(hdr, GFP_KERNEL | __GFP_ZERO); if (!supp_skb) { if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) pfk->registered &= ~(1<sadb_msg_satype); -- cgit v1.2.3