libpam: Fix for CVE-2010-4708

Change default for user_readenv to 0 and document the
new default for user_readenv.

This fix from:
http://pam.cvs.sourceforge.net/viewvc/pam/Linux-PAM/modules/pam_env
/pam_env.c?r1=1.22&r2=1.23&view=patch
http://pam.cvs.sourceforge.net/viewvc/pam/Linux-PAM/modules/pam_env
/pam_env.8.xml?r1=1.7&r2=1.8&view=patch

(From OE-Core master rev: 871ae7a6453b3b66610fd8bbaa770c92be850e19)

(From OE-Core rev: b280268dd0976fe44a7227a99d8f5584c3b94ffa)

Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/pam/libpam/libpam-fix-for-CVE-2010-4708.patch

@@ -0,0 +1,41 @@
+Upstream-Status: Backport
+
+Fix for CVE-2010-4708
+
+Change default for user_readenv to 0 and document the 
+new default for user_readenv.
+
+This fix is got from:
+http://pam.cvs.sourceforge.net/viewvc/pam/Linux-PAM/modules/pam_env
+/pam_env.c?r1=1.22&r2=1.23&view=patch
+http://pam.cvs.sourceforge.net/viewvc/pam/Linux-PAM/modules/pam_env
+/pam_env.8.xml?r1=1.7&r2=1.8&view=patch
+
+Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
+
+---
+--- a/modules/pam_env/pam_env.c	2012-09-05 13:57:47.000000000 +0800
++++ b/modules/pam_env/pam_env.c	2012-09-05 13:58:05.000000000 +0800
+@@ -10,7 +10,7 @@
+ #define DEFAULT_READ_ENVFILE    1
+ 
+ #define DEFAULT_USER_ENVFILE    ".pam_environment"
+-#define DEFAULT_USER_READ_ENVFILE 1
++#define DEFAULT_USER_READ_ENVFILE 0
+ 
+ #include "config.h"
+ 
+--- a/modules/pam_env/pam_env.8.xml	2012-09-05 13:58:24.000000000 +0800
++++ b/modules/pam_env/pam_env.8.xml	2012-09-05 13:59:36.000000000 +0800
+@@ -147,7 +147,10 @@
+         <listitem>
+           <para>
+             Turns on or off the reading of the user specific environment
+-            file. 0 is off, 1 is on. By default this option is on.
++            file. 0 is off, 1 is on. By default this option is off as user
++            supplied environment variables in the PAM environment could affect
++            behavior of subsequent modules in the stack without the consent
++            of the system administrator.
+           </para>
+         </listitem>
+       </varlistentry>

meta/recipes-extended/pam/libpam_1.1.6.bb

@@ -17,6 +17,7 @@ SRC_URI = "http://linux-pam.org/library/Linux-PAM-${PV}.tar.bz2 \
            file://fixsepbuild.patch \
            file://reflect-the-enforce_for_root-semantics-change-in-pam.patch \
            file://add-checks-for-crypt-returning-NULL.patch \
+           file://libpam-fix-for-CVE-2010-4708.patch \
           "
 SRC_URI[md5sum] = "7b73e58b7ce79ffa321d408de06db2c4"
 SRC_URI[sha256sum] = "bab887d6280f47fc3963df3b95735a27a16f0f663636163ddf3acab5f1149fc2"