shadow: fix for CVE-2016-6252

Integer overflow in shadow 4.2.1 allows local users to gain privileges via
crafted input to newuidmap.

References:
==========
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6252
Upstream fix:
https://github.com/shadow-maint/shadow/commit/1d5a926cc2d6078d23a96222b1ef3e558724dad1

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Adrian Dudau <adrian.dudau@enea.com>

2 files changed, 53 insertions, 0 deletions

diff --git a/recipes-extended/shadow/shadow/CVE-2016-6252.patch b/recipes-extended/shadow/shadow/CVE-2016-6252.patch
new file mode 100644
index 0000000..6e05584
--- /dev/null
+++ b/recipes-extended/shadow/shadow/CVE-2016-6252.patch
@@ -0,0 +1,48 @@
+From 1d5a926cc2d6078d23a96222b1ef3e558724dad1 Mon Sep 17 00:00:00 2001
+From: Sebastian Krahmer <krahmer@suse.com>
+Date: Wed, 3 Aug 2016 11:51:07 -0500
+Subject: [PATCH] Simplify getulong
+
+Use strtoul to read an unsigned long, rather than reading
+a signed long long and casting it.
+
+https://bugzilla.suse.com/show_bug.cgi?id=979282
+
+CVE: CVE-2016-6252
+Upstream-Status: Backport [https://github.com/shadow-maint/shadow/commit/1d5a926cc2d6078d23a96222b1ef3e558724dad1]
+
+Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
+---
+ lib/getulong.c | 9 +++------
+ 1 file changed, 3 insertions(+), 6 deletions(-)
+
+diff --git a/lib/getulong.c b/lib/getulong.c
+index 61579cae..08d2c1a8 100644
+--- a/lib/getulong.c
++++ b/lib/getulong.c
+@@ -44,22 +44,19 @@
+  */
+ int getulong (const char *numstr, /*@out@*/unsigned long int *result)
+ {
+-       long long int val;
++       unsigned long int val;
+        char *endptr;
+ 
+        errno = 0;
+-       val = strtoll (numstr, &endptr, 0);
++       val = strtoul (numstr, &endptr, 0);
+        if (    ('\0' == *numstr)
+             || ('\0' != *endptr)
+             || (ERANGE == errno)
+-            /*@+ignoresigns@*/
+-            || (val != (unsigned long int)val)
+-            /*@=ignoresigns@*/
+           ) {
+                return 0;
+        }
+ 
+-       *result = (unsigned long int)val;
++       *result = val;
+        return 1;
+ }
+ 
diff --git a/recipes-extended/shadow/shadow_%.bbappend b/recipes-extended/shadow/shadow_%.bbappend
new file mode 100644
index 0000000..4f04479
--- /dev/null
+++ b/recipes-extended/shadow/shadow_%.bbappend
@@ -0,0 +1,5 @@
+# look for files in the layer first
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "file://CVE-2016-6252.patch \
+           "