From 524b56b5e28875b48613b812be92476573bb8325 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 9 Jul 2025 01:07:03 -0400
Subject: kernel: cred: Introduce SYS_setuid syscall

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/kern/kern_cred.c    | 11 +++++++++++
 sys/kern/kern_syscall.c |  4 +++-
 2 files changed, 14 insertions(+), 1 deletion(-)

(limited to 'sys/kern')

diff --git a/sys/kern/kern_cred.c b/sys/kern/kern_cred.c
index 828ba3b..e1202fc 100644
--- a/sys/kern/kern_cred.c
+++ b/sys/kern/kern_cred.c
@@ -55,3 +55,14 @@ setuid(uid_t new)
     spinlock_release(&cur_cred->lock);
     return 0;
 }
+
+/*
+ * setuid() syscall
+ *
+ * arg0: `new'
+ */
+scret_t
+sys_setuid(struct syscall_args *scargs)
+{
+    return setuid(scargs->arg0);
+}
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c
index 739dd7f..276c7c7 100644
--- a/sys/kern/kern_syscall.c
+++ b/sys/kern/kern_syscall.c
@@ -31,6 +31,7 @@
 #include <sys/sysctl.h>
 #include <sys/reboot.h>
 #include <sys/types.h>
+#include <sys/ucred.h>
 #include <sys/time.h>
 #include <sys/mman.h>
 #include <sys/proc.h>
@@ -55,7 +56,8 @@ scret_t(*g_sctab[])(struct syscall_args *) = {
     sys_sleep,  /* SYS_sleep */
     sys_inject, /* SYS_inject */
     sys_getpid, /* SYS_getpid */
-    sys_getppid /* SYS_getppid */
+    sys_getppid, /* SYS_getppid */
+    sys_setuid,  /* SYS_setuid */
 };
 
 const size_t MAX_SYSCALLS = NELEM(g_sctab);
-- 
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