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diff -rNup a/fedora/glibc_post_upgrade.c b/fedora/glibc_post_upgrade.c
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--- a/fedora/glibc_post_upgrade.c 2011-10-19 05:04:41.000000000 -0600
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+++ b/fedora/glibc_post_upgrade.c 2012-02-06 11:02:03.236713830 -0700
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@@ -60,6 +60,7 @@ is_ia64 (void)
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int
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main (void)
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{
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+ struct stat statbuf;
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char initpath[256];
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char buffer[4096];
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@@ -170,12 +171,24 @@ main (void)
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|| ((!!access ("/dev/initctl", F_OK))
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^ !access ("/sbin/initctl", X_OK)))
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_exit (0);
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+
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/* Check if we are not inside of some chroot, because we'd just
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- timeout and leave /etc/initrunlvl. */
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+ timeout and leave /etc/initrunlvl.
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+
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+ On more modern systems this test is not sufficient to detect
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+ if we're in a chroot. */
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if (readlink ("/proc/1/exe", initpath, 256) <= 0 ||
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readlink ("/proc/1/root", initpath, 256) <= 0)
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_exit (0);
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+ /* Here's another well known way to detect chroot, at least on an
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+ ext and xfs filesystems and assuming nothing mounted on the chroot's
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+ root. */
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+ if (stat ("/", &statbuf) != 0
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+ || (statbuf.st_ino != 2
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+ && statbuf.st_ino != 128))
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+ _exit (0);
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+
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if (check_elf ("/proc/1/exe"))
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verbose_exec (116, "/sbin/telinit", "/sbin/telinit", "u");
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