Re: slapcat segfaults when ppolicy overlay added

[Ryan Steele <ryans@aweber.com>]

Ryan Steele wrote:
> I've been trying, unsuccessfully, to set up ppolicy in my installation
> (2.4.21 on Ubuntu).  As soon as I set up the overlay (before I even
> configure a user with a password policy or set up a default policy),
> slapcatting the database results in a segmentation fault.  I tried it on
> 2.4.23 and 2.4.17 with the same results.  Here is the configuration I'm
> using, and a backtrace from the 2.4.21 installation:
> 
> dn: cn=module{0}
> objectClass: olcModuleList
> cn: module{0}
> olcModulePath: /usr/lib/ldap
> olcModuleLoad: {0}back_hdb.la
> olcModuleLoad: {1}autogroup.la
> olcModuleLoad: {2}syncprov.la
> olcModuleLoad: {3}smbk5pwd.la
> olcModuleLoad: {4}ppolicy.la
> 
> 
> dn: olcOverlay={3}ppolicy
> objectClass: olcOverlayConfig
> objectClass: olcPPolicyConfig
> olcOverlay: {3}ppolicy
> olcPPolicyHashCleartext: FALSE
> olcPPolicyUseLockout: TRUE
> olcPPolicyForwardUpdates: FALSE
> structuralObjectClass: olcPPolicyConfig
> 
> 
> (gdb) run
> Starting program: /usr/sbin/slapcat -n1
> [Thread debugging using libthread_db enabled]
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff242d840 in ppolicy_restrict (op=0x7fffffffd710,
> rs=0x7fffffffd670) at
> /usr/src/openldap/openldap-2.4.21/servers/slapd/overlays/ppolicy.c:1271
> 1271   
> /usr/src/openldap/openldap-2.4.21/servers/slapd/overlays/ppolicy.c: No
> such file or directory.
>     in /usr/src/openldap/openldap-2.4.21/servers/slapd/overlays/ppolicy.c
> (gdb) backtrace
> #0  0x00007ffff242d840 in ppolicy_restrict (op=0x7fffffffd710,
> rs=0x7fffffffd670) at
> /usr/src/openldap/openldap-2.4.21/servers/slapd/overlays/ppolicy.c:1271
> #1  0x00007ffff7f6ed3a in overlay_op_walk (op=0x7fffffffd710,
> rs=0x7fffffffd670, which=<value optimized out>, oi=0x7ffff8320fc0,
> on=0x7ffff8340d50)
>     at /usr/src/openldap/openldap-2.4.21/servers/slapd/backover.c:659
> #2  0x00007ffff7f6f8ab in over_op_func (op=0x7fffffffd710,
> rs=0xfffffffffffffff0, which=4294957776)
>     at /usr/src/openldap/openldap-2.4.21/servers/slapd/backover.c:721
> #3  0x00007ffff2a4b141 in autogroup_db_open (be=<value optimized out>,
> cr=<value optimized out>) at autogroup.c:1754
> #4  0x00007ffff7f6e994 in over_db_open (be=<value optimized out>,
> cr=0x7fffffffdfc0) at
> /usr/src/openldap/openldap-2.4.21/servers/slapd/backover.c:155
> #5  0x00007ffff7f1388c in backend_startup_one (be=0x7ffff8314e80,
> cr=0x7fffffffdfc0) at
> /usr/src/openldap/openldap-2.4.21/servers/slapd/backend.c:224
> #6  0x00007ffff7f13a83 in backend_startup (be=0x7ffff8314e80) at
> /usr/src/openldap/openldap-2.4.21/servers/slapd/backend.c:278
> #7  0x00007ffff7f742cc in slap_tool_init (progname=<value optimized
> out>, tool=2, argc=2, argv=0x7fffffffe5b8)
>     at /usr/src/openldap/openldap-2.4.21/servers/slapd/slapcommon.c:780
> #8  0x00007ffff7f7335a in slapcat (argc=-9520, argv=<value optimized
> out>) at /usr/src/openldap/openldap-2.4.21/servers/slapd/slapcat.c:51
> #9  0x00007ffff7ee84f5 in main (argc=2, argv=0x7fffffffe5b8) at
> /usr/src/openldap/openldap-2.4.21/servers/slapd/main.c:657
> 

For reference, the line from ppolicy_restrict() it's segfaulting on (1271) looks like so:

    if ( op->o_conn && !BER_BVISEMPTY( &pwcons[op->o_conn->c_conn_idx].dn )) {

> 
> As soon as I remove olcOverlay={3}ppolicy from the backend database, the
> problem disappears.  The configuration isn't anything special so I don't
> think it's a misconfiguration issue, but I figured I'd get a second
> opinion from the list before submitting this issue as a bug to the ITS. 
> As always, all advice and input is appreciated.
> 
> -Ryan