Split out kill(2) syscall service routine into user-level and kernel part, the

former is callable from user space and the latter from the kernel one. Make
kernel version take additional argument which tells if the respective call
should check for additional restrictions for sending signals to suid/sugid
applications or not.

Make all emulation layers using non-checked version, since signal numbers in
emulation layers can have different meaning that in native mode and such
protection can cause misbehaviour.

As a result remove LIBTHR from the signals allowed to be delivered to a
suid/sugid application.

Requested (sorta) by:	rwatson
MFC after:	2 weeks

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/compat/svr4/svr4_signal.c b/sys/compat/svr4/svr4_signal.c
index 1a3f7f1..2ccebd5 100644
--- a/sys/compat/svr4/svr4_signal.c
+++ b/sys/compat/svr4/svr4_signal.c
@@ -521,7 +521,7 @@ svr4_sys_kill(td, uap)
 		return (EINVAL);
 	ka.pid = uap->pid;
 	ka.signum = SVR4_SVR42BSD_SIG(uap->signum);
-	return kill(td, &ka);
+	return kern_kill(td, &ka, 0);
 }