Public bug reported:
Since our upgrade to 13.04 (we had 12.10 previously) our administrators
cannot use "sudo" anymore. When sudo is used and either the correct
password or incorrect password is used sudo immediately crashes with the
following crash report:
-- cut here --
sudo[23352]: segfault at 0 ip 00007f40ff4da5e4 sp 00007fffa07c3ec8 error 4 in
libc-2.17.so[7f40ff443000+1be000]
-- cut here --
After some investigation we found that as soon as we disable nss-ldap
support in /etc/nsswitch.conf by removing the "ldap" statements in the
passwd,shadow and group rows sudo works as expected. Howeer, of course
then the ldap users are gone. Besides that crash "getent passwd",
"getent group" or any other name service query seems to work fine. Also
disabling/stopping "nscd" doesn't seem to solve the problem.
After some further investigation we even found out that not only sudo is
affected, but also sshd crashes under certain circumstances as soon as
nss-ldap support is enabled in /etc/nsswitch.conf. Then sshd also
crashes with a similar crash in libc-2.17.so:
-- cut here --
sshd[11457]: segfault at 0 ip 00007f40cb0cc5e4 sp 00007fff7204d038 error 4 in
libc-2.17.so[7f40cb035000+1be000]
-- cut here --
All the servers that still use Ubuntu 12.10 seems to work fine so far.
Thus, the combination of nss-ldap and libc-2.17.so seem to crash our
system.
** Affects: libnss-ldap (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1185699
Title:
libnss-ldap crashes in libc-2.17.so when using sudo/sshd
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