1 files changed, 10 insertions, 0 deletions

diff --git a/uidswap.c b/uidswap.c
index 91d878c30..837648396 100644
--- a/uidswap.c
+++ b/uidswap.c
@@ -233,6 +233,16 @@ permanently_set_uid(struct passwd *pw)
                 fatal("setgid %u: %.100s", (u_int)pw->pw_gid, strerror(errno));
 #endif
 
+#ifdef __APPLE__
+        /*
+         * OS X requires initgroups after setgid to opt back into
+         * memberd support for >16 supplemental groups.
+         */
+        if (initgroups(pw->pw_name, pw->pw_gid) < 0)
+                fatal("initgroups %.100s %u: %.100s",
+                    pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
+#endif
+
 #if defined(HAVE_SETRESUID) && !defined(BROKEN_SETRESUID)
         if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) < 0)
                 fatal("setresuid %u: %.100s", (u_int)pw->pw_uid, strerror(errno));