https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206544
Bug ID: 206544
Summary: sendit "KPI" (in reality sendmsg(2); maybe sendto(2))
will fail with EINVAL if there's a mp->msg_control is
not NULL and mp->msg_controllen is < sizeof(struct
cmsghdr); is not documented in send(2)
Product: Base System
Version: 9.3-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
769 static int
770 sendit(td, s, mp, flags)
771 struct thread *td;
772 int s;
773 struct msghdr *mp;
774 int flags;
775 {
...
796 if (mp->msg_control) {
797 if (mp->msg_controllen < sizeof(struct cmsghdr)
798 #ifdef COMPAT_OLDSOCK
799 && mp->msg_flags != MSG_COMPAT
800 #endif
801 ) {
802 error = EINVAL;
803 goto bad;
804 }
The behavior on line 802 is not documented anywhere in send(2). It was driving
me nuts trying to figure out what was going on in
tools/regression/unix_cmsg:t_cmsg_len because the test fails on amd64 because
that conditional is tripped -_-...
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