netdev - [PATCH ipsec] Revert "net: af_key: add check for pfkey_broadcast in function pfkey

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Message-Id: <fbb31dc72fb38a69a2aca6c25f1be71d6a8bcc96.1653321424.git.mkubecek@suse.cz>
Date:   Mon, 23 May 2022 18:01:24 +0200 (CEST)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        netdev@...r.kernel.org
Cc:     Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH ipsec] Revert "net: af_key: add check for pfkey_broadcast in
 function pfkey_process"

This reverts commit 4dc2a5a8f6754492180741facf2a8787f2c415d7.

A non-zero return value from pfkey_broadcast() does not necessarily mean
an error occurred as this function returns -ESRCH when no registered
listener received the message. In particular, a call with
BROADCAST_PROMISC_ONLY flag and null one_sk argument can never return
zero so that this commit in fact prevents processing any PF_KEY message.
One visible effect is that racoon daemon fails to find encryption
algorithms like aes and refuses to start.

Excluding -ESRCH return value would fix this but it's not obvious that
we really want to bail out here and most other callers of
pfkey_broadcast() also ignore the return value. Also, as pointed out by
Steffen Klassert, PF_KEY is kind of deprecated and newer userspace code
should use netlink instead so that we should only disturb the code for
really important fixes.

Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 net/key/af_key.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 339d95df19d3..fbb2c16693ad 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -2826,10 +2826,8 @@ static int pfkey_process(struct sock *sk, struct sk_buff *skb, const struct sadb
 	void *ext_hdrs[SADB_EXT_MAX];
 	int err;

-	err = pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
-			      BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));
-	if (err)
-		return err;
+	pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL,
+			BROADCAST_PROMISC_ONLY, NULL, sock_net(sk));

 	memset(ext_hdrs, 0, sizeof(ext_hdrs));
 	err = parse_exthdrs(skb, hdr, ext_hdrs);
-- 
2.36.1