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diff -up ecryptfs-utils-106/src/pam_ecryptfs/pam_ecryptfs.c.fixexecgid ecryptfs-utils-106/src/pam_ecryptfs/pam_ecryptfs.c
--- ecryptfs-utils-106/src/pam_ecryptfs/pam_ecryptfs.c.fixexecgid	2015-03-30 11:13:48.419194024 +0200
+++ ecryptfs-utils-106/src/pam_ecryptfs/pam_ecryptfs.c	2015-03-30 11:16:44.434863028 +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);