From: Eric W. Biederman Date: Wed, 3 Apr 2013 16:13:35 +0000 (+0000) Subject: Revert "af_unix: dont send SCM_CREDENTIAL when dest socket is NULL" X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=25da0e3e9d3fb2b522bc2a598076735850310eb1;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git Revert "af_unix: dont send SCM_CREDENTIAL when dest socket is NULL" This reverts commit 14134f6584212d585b310ce95428014b653dfaf6. The problem that the above patch was meant to address is that af_unix messages are not being coallesced because we are sending unnecesarry credentials. Not sending credentials in maybe_add_creds totally breaks unconnected unix domain sockets that wish to send credentails to other sockets. In practice this break some versions of udev because they receive a message and the sending uid is bogus so they drop the message. Reported-by: Sven Joachim Signed-off-by: "Eric W. Biederman" Signed-off-by: David S. Miller --- diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 971282b6f6a3..f153a8d6e339 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1412,8 +1412,8 @@ static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock, if (UNIXCB(skb).cred) return; if (test_bit(SOCK_PASSCRED, &sock->flags) || - (other->sk_socket && - test_bit(SOCK_PASSCRED, &other->sk_socket->flags))) { + !other->sk_socket || + test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) { UNIXCB(skb).pid = get_pid(task_tgid(current)); UNIXCB(skb).cred = get_current_cred(); }