--- /dev/null
+From 9dcead87e6d7f66d34e7a56d11a30daca367dffb Mon Sep 17 00:00:00 2001
+From: "Dmitry V. Levin" <ldv@altlinux.org>
+Date: Wed, 26 Mar 2014 22:17:23 +0000
+Subject: [PATCH] pam_timestamp: fix potential directory traversal issue
+ (ticket #27)
+
+commit 9dcead87e6d7f66d34e7a56d11a30daca367dffb upstream
+
+pam_timestamp uses values of PAM_RUSER and PAM_TTY as components of
+the timestamp pathname it creates, so extra care should be taken to
+avoid potential directory traversal issues.
+
+* modules/pam_timestamp/pam_timestamp.c (check_tty): Treat
+"." and ".." tty values as invalid.
+(get_ruser): Treat "." and ".." ruser values, as well as any ruser
+value containing '/', as invalid.
+
+Fixes CVE-2014-2583.
+
+Reported-by: Sebastian Krahmer <krahmer@suse.de>
+
+Upstream-Status: Backport
+
+Signed-off-by: Yue Tao <Yue.Tao@windriver.com>
+Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
+---
+ modules/pam_timestamp/pam_timestamp.c | 13 ++++++++++++-
+ 1 files changed, 12 insertions(+), 1 deletions(-)
+
+diff --git a/modules/pam_timestamp/pam_timestamp.c b/modules/pam_timestamp/pam_timestamp.c
+index 5193733..b3f08b1 100644
+--- a/modules/pam_timestamp/pam_timestamp.c
++++ b/modules/pam_timestamp/pam_timestamp.c
+@@ -158,7 +158,7 @@ check_tty(const char *tty)
+ tty = strrchr(tty, '/') + 1;
+ }
+ /* Make sure the tty wasn't actually a directory (no basename). */
+- if (strlen(tty) == 0) {
++ if (!strlen(tty) || !strcmp(tty, ".") || !strcmp(tty, "..")) {
+ return NULL;
+ }
+ return tty;
+@@ -243,6 +243,17 @@ get_ruser(pam_handle_t *pamh, char *ruserbuf, size_t ruserbuflen)
+ if (pwd != NULL) {
+ ruser = pwd->pw_name;
+ }
++ } else {
++ /*
++ * This ruser is used by format_timestamp_name as a component
++ * of constructed timestamp pathname, so ".", "..", and '/'
++ * are disallowed to avoid potential path traversal issues.
++ */
++ if (!strcmp(ruser, ".") ||
++ !strcmp(ruser, "..") ||
++ strchr(ruser, '/')) {
++ ruser = NULL;
++ }
+ }
+ if (ruser == NULL || strlen(ruser) >= ruserbuflen) {
+ *ruserbuf = '\0';
+--
+1.7.5.4
+
