[Bug 761463] [NEW] edquota crashes when used with libnss-db

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Binary package hint: libnss-db

Hello,

This is from Ubuntu Lucid, libnss-db 2.2.3pre1-3.1ubuntu4.

I am using nss-updatedb to get user information from LDAP and I am using
nsswitch.conf with the 'db' backend. Everything was fine until I tried
to setup quota on one of the machines. edquota segfaults. I changed the
backend to 'ldap', and this worked so this showed that the problem is in
libnss-db.

LD_PRELOAD=/lib/libpthread.so.0 gdb --args edquota -f /home -u bt
GNU gdb (GDB) 7.1-ubuntu
[...]
(gdb) run
Starting program: /usr/sbin/edquota -f /home -u bt
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff81ff8f0 in dirname ()
(gdb) bt
#0  0x00007ffff81ff8f0 in dirname ()
#1  0x00007ffff741b893 in ?? () from /usr/lib/libnss_db.so.2
#2  0x00007ffff741a21a in ?? () from /usr/lib/libnss_db.so.2
#3  0x00007ffff741a59b in _nss_db_getpwnam_r () from /usr/lib/libnss_db.so.2
#4  0x00007ffff78d449d in getpwnam_r () from /lib/libc.so.6
#5  0x00007ffff78d3e80 in getpwnam () from /lib/libc.so.6
#6  0x00007ffff7ff4fec in ?? ()
#7  0x00007ffff7ff0a4c in main ()

This was not very communicative, so I recompiled the package without dh_strip, and tried the same:
LD_PRELOAD=/lib/libpthread.so.0 gdb --args edquota -f /home -u bt
[...]
(gdb) run
Starting program: /usr/sbin/edquota -f /home -u bt
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff81ff8f0 in dirname ()
(gdb) bt
#0  0x00007ffff81ff8f0 in dirname ()
#1  0x00007ffff741b893 in internal_setent (
    file=0x7ffff741ba87 "/var/lib/misc/passwd.db", dbp=0x7ffff761d290,
    dbenvp=0x7ffff761d288) at db-open.c:66
#2  0x00007ffff741a21a in lookup (key=0x7fffffffe4a0, result=0x7ffff7baace0,
    buffer=0x7ffff820a000, buflen=1024, errnop=0x7ffff7fd06a8) at db-XXX.c:116
#3  0x00007ffff741a59b in _nss_db_getpwnam_r (name=0x7fffffffe972 "bt",
    result=0x7ffff7baace0, buffer=0x7ffff820a000 "qatools", buflen=1024,
    errnop=0x7ffff7fd06a8) at files-pwd.c:33
#4  0x00007ffff78d449d in getpwnam_r () from /lib/libc.so.6
#5  0x00007ffff78d3e80 in getpwnam () from /lib/libc.so.6
#6  0x00007ffff7ff4fec in ?? ()
#7  0x00007ffff7ff0a4c in main ()

Well, I am no developer, so I don't give a clue about why this fails.

Could somebody please fix it?

Best regards,
Boleslaw Tokarski

** Affects: quota (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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edquota crashes when used with libnss-db
https://bugs.launchpad.net/bugs/761463
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