the 5.1 era tfork syscall claws its way out of the grave. we failed to

fully deprecate it (notably the go port was still using it as of 5.3)
so to give users a little more time to update, __tfork51 lives again.
okish deraadt guenther

1 files changed, 26 insertions, 1 deletions

diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
index b3e658c3692..02bc078a951 100644
--- a/sys/kern/kern_fork.c
+++ b/sys/kern/kern_fork.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_fork.c,v 1.144 2013/03/02 07:05:17 guenther Exp $	*/
+/*	$OpenBSD: kern_fork.c,v 1.145 2013/03/14 21:38:22 tedu Exp $	*/
 /*	$NetBSD: kern_fork.c,v 1.29 1996/02/09 18:59:34 christos Exp $	*/
 
 /*
@@ -141,6 +141,31 @@ sys___tfork(struct proc *p, void *v, register_t *retval)
 	    tfork_child_return, param.tf_tcb, retval, NULL));
 }
 
+#ifdef COMPAT_O51
+int
+compat_o51_sys___tfork(struct proc *p, void *v, register_t *retval)
+{
+	struct compat_o51_sys___tfork_args /* {
+		syscallarg(struct __tfork51) *param;
+	} */ *uap = v;
+	struct __tfork51 param;
+	int flags;
+	int error;
+
+	if ((error = copyin(SCARG(uap, param), &param, sizeof(param))))
+		return (error);
+
+	if (param.tf_flags != 0)
+		return (EINVAL);
+
+	flags = FORK_TFORK | FORK_THREAD | FORK_SIGHAND | FORK_SHAREVM
+	    | FORK_NOZOMBIE | FORK_SHAREFILES;
+
+	return (fork1(p, 0, flags, NULL, param.tf_tid, tfork_child_return,
+	    param.tf_tcb, retval, NULL));
+}
+#endif
+
 void
 tfork_child_return(void *arg)
 {