2 files changed, 24 insertions, 0 deletions

diff --git a/sys/kern/kern_prot.c b/sys/kern/kern_prot.c
index 8ced323613be4..003ff3b49d11f 100644
--- a/sys/kern/kern_prot.c
+++ b/sys/kern/kern_prot.c
@@ -44,6 +44,7 @@
  */
 
 #include "opt_compat.h"
+#include "opt_global.h"
 
 #include <sys/param.h>
 #include <sys/acct.h>
@@ -911,6 +912,28 @@ issetugid(p, uap)
 	return (0);
 }
 
+int
+__setugid(p, uap)
+	struct proc *p;
+	struct __setugid_args *uap;
+{
+
+#ifdef REGRESSION
+	switch (uap->flag) {
+	case 0:
+		p->p_flag &= ~P_SUGID;
+		return (0);
+	case 1:
+		p->p_flag |= P_SUGID;
+		return (0);
+	default:
+		return (EINVAL);
+	}
+#else /* !REGRESSION */
+	return (ENOSYS);
+#endif /* !REGRESSION */
+}
+
 /*
  * Check if gid is a member of the group set.
  */
diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
index aec2ea6706ba7..ad24185ad56f9 100644
--- a/sys/kern/syscalls.master
+++ b/sys/kern/syscalls.master
@@ -541,3 +541,4 @@
 			    int iovcnt); }
 373	STD	BSD	{ int extattr_delete_fd(int fd, int attrnamespace, \
 			    const char *attrname); }
+374	STD	BSD	{ int __setugid(int flag); }