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| author | Michal Kubecek <mkubecek@suse.cz> | 2022-05-23 23:05:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-14 17:54:00 +0300 |
| commit | a7afaf7916d08ed6c9cc4267962d3f0912291f64 (patch) | |
| tree | cf0966ecce47ffec26b7b55a3d51f969f25c796d /net/key | |
| parent | 9f8131fd70cb687269744bc6712095e41ab65fb0 (diff) | |
| download | linux-a7afaf7916d08ed6c9cc4267962d3f0912291f64.tar.xz | |
Revert "net: af_key: add check for pfkey_broadcast in function pfkey_process"
[ Upstream commit 9c90c9b3e50e16d03c7f87d63e9db373974781e0 ]
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.
v2: add a comment explaining why is the return value ignored
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/key')
| -rw-r--r-- | net/key/af_key.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c index 990de0702b79..035123bf7259 100644 --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -2834,10 +2834,12 @@ 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; + /* Non-zero return value of pfkey_broadcast() does not always signal + * an error and even on an actual error we may still want to process + * the message so rather ignore the return value. + */ + 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); |