glibc: CVE-2014-9402 endless loop in getaddr_r

The getnetbyname function in glibc 2.21 in earlier will enter an infinite loop
if the DNS backend is activated in the system Name Service Switch
configuration, and the DNS resolver receives a positive answer while processing
the network name.

(From OE-Core rev: f03bf84c179f69ef4800ed92a4a9d9401d0e5966)

(From OE-Core rev: 7e3f4ddd001f9c50a49d8ba5ab548af311e6b51f)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 66 insertions, 0 deletions

diff --git a/meta/recipes-core/glibc/glibc/CVE-2014-9402_endless-loop-in-getaddr_r.patch b/meta/recipes-core/glibc/glibc/CVE-2014-9402_endless-loop-in-getaddr_r.patch
new file mode 100644
index 0000000000..ba1da67b76
--- /dev/null
+++ b/meta/recipes-core/glibc/glibc/CVE-2014-9402_endless-loop-in-getaddr_r.patch
@@ -0,0 +1,65 @@
+CVE-2014-9402 endless loop in getaddr_r
+
+
+https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commit;h=11e3417af6e354f1942c68a271ae51e892b2814d
+
+Upstream-Status: Backport
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+From 11e3417af6e354f1942c68a271ae51e892b2814d Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer@redhat.com>
+Date: Mon, 15 Dec 2014 17:41:13 +0100
+Subject: [PATCH] Avoid infinite loop in nss_dns getnetbyname [BZ #17630]
+
+---
+ ChangeLog                    | 6 ++++++
+ NEWS                         | 7 +++++--
+ resolv/nss_dns/dns-network.c | 4 ++--
+ 3 files changed, 13 insertions(+), 4 deletions(-)
+
+Index: git/NEWS
+===================================================================
+--- git.orig/NEWS
++++ git/NEWS
+@@ -24,7 +24,10 @@ Version 2.20
+   17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
+   17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
+   17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354,
+-  17625.
++  17625, 17630.
++
++* The nss_dns implementation of getnetbyname could run into an infinite loop
++  if the DNS response contained a PTR record of an unexpected format.
+ 
+ * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
+   under certain input conditions resulting in the execution of a shell for
+Index: git/resolv/nss_dns/dns-network.c
+===================================================================
+--- git.orig/resolv/nss_dns/dns-network.c
++++ git/resolv/nss_dns/dns-network.c
+@@ -398,8 +398,8 @@ getanswer_r (const querybuf *answer, int
+ 
+        case BYNAME:
+          {
+-           char **ap = result->n_aliases++;
+-           while (*ap != NULL)
++           char **ap;
++           for (ap = result->n_aliases; *ap != NULL; ++ap)
+              {
+                /* Check each alias name for being of the forms:
+                   4.3.2.1.in-addr.arpa         = net 1.2.3.4
+Index: git/ChangeLog
+===================================================================
+--- git.orig/ChangeLog
++++ git/ChangeLog
+@@ -1,3 +1,9 @@
++2014-12-16  Florian Weimer  <fweimer@redhat.com>
++
++       [BZ #17630]
++       * resolv/nss_dns/dns-network.c (getanswer_r): Iterate over alias
++       names.
++
+ 2014-12-15  Jeff Law  <law@redhat.com>
+ 
+    [BZ #16617]
diff --git a/meta/recipes-core/glibc/glibc_2.20.bb b/meta/recipes-core/glibc/glibc_2.20.bb
index f67fbfdf0d..8a8b296def 100644
--- a/meta/recipes-core/glibc/glibc_2.20.bb
+++ b/meta/recipes-core/glibc/glibc_2.20.bb
@@ -44,6 +44,7 @@ EGLIBCPATCHES = "\
 CVEPATCHES = "\
         file://CVE-2014-7817-wordexp-fails-to-honour-WRDE_NOCMD.patch \
         file://CVE-2012-3406-Stack-overflow-in-vfprintf-BZ-16617.patch \
+        file://CVE-2014-9402_endless-loop-in-getaddr_r.patch \
     "
 LIC_FILES_CHKSUM = "file://LICENSES;md5=e9a558e243b36d3209f380deb394b213 \
       file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263 \