Package: mount
Version: 2.12p-8
Severity: important
There are several calls to update_mtab() which are not guarded by
mtab_is_writable(). The one causing me trouble, in particular, is:
if (res < 0 && remount && (umnt_err == EBUSY || umnt_err2 == EBUSY)) {
/* Umount failed - let us try a remount */
res = mount(spec, node, NULL,
MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
if (res == 0) {
struct my_mntent remnt;
fprintf(stderr,
_("umount: %s busy - remounted read-only\n"),
spec);
remnt.mnt_type = remnt.mnt_fsname = NULL;
remnt.mnt_dir = xstrdup(node);
remnt.mnt_opts = xstrdup("ro");
update_mtab(node, &remnt);
return 0;
} else if (errno != EBUSY) { /* hmm ... */
perror("remount");
fprintf(stderr,
_("umount: could not remount %s read-only\n"),
spec);
}
}
Specifically, this is what happened: an --rbind mount failed to be unmounted
during /etc/init.d/umountfs (see my earlier bug report). Umount dutifully
remounted the bind mount read only. This had the side effect of also
remounting the root filesystem readonly. This succeeded, so a message was
printed and update_mtab was called. update_mtab called die because the root
filesystem was now readonly. umount exited, without processing any of the
other filesystems listed on its command line.
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.14-rc5
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Versions of packages mount depends on:
ii libblkid1 1.38-2 block device id library
ii libc6 2.3.5-7 GNU C Library: Shared libraries an
ii libuuid1 1.38-2 universally unique id library
mount recommends no packages.
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