diff -up ecryptfs-utils-108/src/pam_ecryptfs/pam_ecryptfs.c.fixexecgid ecryptfs-utils-108/src/pam_ecryptfs/pam_ecryptfs.c

--- ecryptfs-utils-108/src/pam_ecryptfs/pam_ecryptfs.c.fixexecgid	2015-08-11 14:43:59.298822826 +0200

+++ ecryptfs-utils-108/src/pam_ecryptfs/pam_ecryptfs.c	2015-08-11 14:43:59.299822823 +0200

@@ -365,8 +365,10 @@ static int private_dir(pam_handle_t *pam

 				_exit(0);

 			}

 			clearenv();

-			if (setgroups(1, &pwd->pw_gid) < 0 || setgid(pwd->pw_gid) < 0)

+			if (initgroups(pwd->pw_name, pwd->pw_gid) != 0) {

+				syslog(LOG_ERR, "Unable to set user's groups : %m");

 				_exit(-1);

+			}

 			/* run mount.ecryptfs_private as the user */

 			if (setresuid(pwd->pw_uid, pwd->pw_uid, pwd->pw_uid) < 0)

 				_exit(-1);

@@ -380,8 +382,10 @@ static int private_dir(pam_handle_t *pam

 				_exit(0);

 			}

 			clearenv();

-			if (setgroups(1, &pwd->pw_gid) < 0 || setgid(pwd->pw_gid) < 0)

+			if (initgroups(pwd->pw_name, pwd->pw_gid) != 0) {

+				syslog(LOG_ERR, "Unable to set user's groups : %m");

 				_exit(-1);

+			}

 			/* run umount.ecryptfs_private as the user */

 			if (setresuid(pwd->pw_uid, pwd->pw_uid, pwd->pw_uid) < 0)

 				_exit(-1);