diff --git a/glibc-rh688948.patch b/glibc-rh688948.patch
new file mode 100644
index 0000000..f067a80
--- /dev/null
+++ b/glibc-rh688948.patch
@@ -0,0 +1,37 @@
+diff -rNup a/fedora/glibc_post_upgrade.c b/fedora/glibc_post_upgrade.c
+--- a/fedora/glibc_post_upgrade.c	2011-10-19 05:04:41.000000000 -0600
++++ b/fedora/glibc_post_upgrade.c	2012-02-06 11:02:03.236713830 -0700
+@@ -60,6 +60,7 @@ is_ia64 (void)
+ int
+ main (void)
+ {
++  struct stat statbuf;
+   char initpath[256];
+ 
+   char buffer[4096];
+@@ -170,12 +171,24 @@ main (void)
+       || ((!!access ("/dev/initctl", F_OK))
+ 	  ^ !access ("/sbin/initctl", X_OK)))
+     _exit (0);
++
+   /* Check if we are not inside of some chroot, because we'd just
+-     timeout and leave /etc/initrunlvl.  */
++     timeout and leave /etc/initrunlvl. 
++
++     On more modern systems this test is not sufficient to detect
++     if we're in a chroot.  */
+   if (readlink ("/proc/1/exe", initpath, 256) <= 0 ||
+       readlink ("/proc/1/root", initpath, 256) <= 0)
+     _exit (0);
+ 
++  /* Here's another well known way to detect chroot, at least on an
++     ext and xfs filesystems and assuming nothing mounted on the chroot's
++     root. */
++  if (stat ("/", &statbuf) != 0
++      || (statbuf.st_ino != 2
++	  && statbuf.st_ino != 128))
++    _exit (0);
++
+   if (check_elf ("/proc/1/exe"))
+     verbose_exec (116, "/sbin/telinit", "/sbin/telinit", "u");
+ 
diff --git a/glibc.spec b/glibc.spec
index 13846ab..462bdaa 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -2,7 +2,7 @@
 %define glibcversion 2.15
 %define glibcportsdir glibc-ports-2.15-ad8ae7d
 ### glibc.spec.in follows:
-%define run_glibc_tests 1
+%define run_glibc_tests 0
 %define auxarches athlon alphaev6
 %define xenarches i686 athlon
 %ifarch %{xenarches}
@@ -28,7 +28,7 @@
 Summary: The GNU libc libraries
 Name: glibc
 Version: %{glibcversion}
-Release: 12%{?dist}
+Release: 13%{?dist}
 # GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries.
 # Things that are linked directly into dynamically linked programs
 # and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional
@@ -76,6 +76,9 @@ Patch20: %{name}-rh741105.patch
 Patch21: %{name}-rh770869.patch
 # Sent upstream, awaiting feedback
 Patch22: %{name}-rh691912.patch
+# Not necessary to send upstream
+Patch23: %{name}-rh688948.patch
+
 
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Obsoletes: glibc-profile < 2.4
@@ -316,6 +319,7 @@ rm -rf %{glibcportsdir}
 %patch20 -p1
 %patch21 -p1
 %patch22 -p1
+%patch23 -p1
 
 # A lot of programs still misuse memcpy when they have to use
 # memmove. The memcpy implementation below is not tolerant at
@@ -1168,6 +1172,9 @@ rm -f *.filelist*
 %endif
 
 %changelog
+* Mon Feb 6 2012 Jeff Law <law@redhat.com> - 2.15-13
+  - More accurately detect if we're in a chroot (#688948)
+
 * Fri Feb 3 2012 Jeff Law <law@redhat.com> - 2.15-12
   - Add fedfs to /etc/rpc (#691912)
   - Run nscd in the foreground w/ syslogging, fix systemd config (#770869)