Bug 720059

Backtrace:


#0  0x00007ffff550eb60 in strlen () from /lib64/libc.so.6
#1  0x00007ffff5e36c7c in cvt_s (ss=0x478056d0, fmt=<value optimized out>, 
    ap=<value optimized out>) at ../../.././mozilla/nsprpub/pr/src/io/prprf.c:396
#2  dosprintf (ss=0x478056d0, fmt=<value optimized out>, ap=<value optimized out>)
    at ../../.././mozilla/nsprpub/pr/src/io/prprf.c:980
#3  0x00007ffff5e36e64 in PR_vsnprintf (out=<value optimized out>, 
    outlen=<value optimized out>, fmt=0xffffffff <Address 0xffffffff out of bounds>, 
    ap=0x7) at ../../.././mozilla/nsprpub/pr/src/io/prprf.c:1184
#4  0x00007ffff5e37103 in PR_snprintf (out=0x9 <Address 0x9 out of bounds>, outlen=115, 
    fmt=0x47805748 "\t") at ../../.././mozilla/nsprpub/pr/src/io/prprf.c:1164
#5  0x00007fffef1d5305 in _entryrdn_new_rdn_elem (be=<value optimized out>, 
    id=<value optimized out>, srdn=<value optimized out>, length=<value optimized out>)
    at ldap/servers/slapd/back-ldbm/ldbm_entryrdn.c:1358
#6  0x00007fffef1d5984 in _entryrdn_index_read (be=0x8626f0, cursor=0x9004d0, 
    srdn=0x478079b0, elem=0x478079f0, parentelem=0x0, childelems=0x0, db_txn=0x0)
    at ldap/servers/slapd/back-ldbm/ldbm_entryrdn.c:2622
#7  0x00007fffef1d7acc in entryrdn_index_read (be=0x8626f0, sdn=<value optimized out>, 
    id=0x47807a7c, txn=<value optimized out>)
    at ldap/servers/slapd/back-ldbm/ldbm_entryrdn.c:368
#8  0x00007fffef1b16c9 in dn2entry (be=0x8626f0, sdn=0x47807ac0, txn=0x47807d30, 
    err=0x47807afc) at ldap/servers/slapd/back-ldbm/dn2entry.c:80
#9  0x00007fffef1b1885 in get_copy_of_entry (pb=0xb62cc0, addr=0x47807cd0, 
    txn=0x47807d30, plock_parameter=61, must_exist=1)
    at ldap/servers/slapd/back-ldbm/dn2entry.c:261

Created attachment 512258 [details]
0001-Bug-720059-RDN-with-can-cause-crashes-or-missing-ent.patch

To ssh://git.fedorahosted.org/git/389/ds.git
   d2960e2..0263e0b  master -> master
commit 0263e0bffdfcb9cf59b7c6ba29f060987d06449a
Author: Rich Megginson <rmeggins>
Date:   Mon Jul 11 10:08:56 2011 -0600
    Reviewed by: nhosoi (Thanks!)
    Branch: master
    Fix Description: The code was using PR_snprintf to copy the RDN to the
    buffer used to store the value in the entryrdn index.  If there was
    a % in the value, the PR_snprintf was interpreting the next char as a
    formatting directive.  But since we don't pass any varargs arguments,
    the formatting directive was using random garbage on the stack, which
    can lead to crashes or missing entries or other undefined behavior.
    The fix is to use PL_strncpyz which will just copy the string up to
    the correct buffer size and will make sure the string is properly
    null terminated.
    You can use a simple C program to illustrate this problem:
    
    int
    main(int argc, char *argv[])
    {
        char buf[10];
        argv++;
        for (; *argv; ++argv) {
            PR_snprintf(buf, sizeof(buf), *argv);
            printf("buf is [%s]\n", buf);
        }
    
        return 0;
    }
    gcc -o testit testit.c -lnspr4
    Then pass in values like %d %100s %100.100s and so on.  You will either
    get crashes or random output.
    Platforms tested: RHEL6 x86_64
    Flag Day: no
    Doc impact: no

The patch works for me.

I built the packages with the patch applied if anybody needs them:

http://50.57.106.86/files/389-ds-base-1.2.8.3-2.1.diegows.x86_64.rpm
http://50.57.106.86/files/389-ds-base-libs-1.2.8.3-2.1.diegows.x86_64.rpm

[root@rheltest ~]# ldapadd -x -h localhost -p 1389 -D "cn=directory manager" -w Secret123 << EOF
> dn: ou=SUDOers,ou=groups,dc=pnq,dc=redhat,dc=com
> ou: SUDOers
> objectClass: top
> objectClass: organizationalUnit
> EOF
adding new entry "ou=SUDOers,ou=groups,dc=pnq,dc=redhat,dc=com"

[root@rheltest ~]# ldapadd -x -h localhost -p 1389 -D "cn=directory manager" -w Secret123 << EOF
> dn: cn=segu,ou=groups,dc=pnq,dc=redhat,dc=com
> gidNumber: 1100
> objectClass: top
> objectClass: groupofuniquenames
> objectClass: posixgroup
> cn: segu
> EOF
adding new entry "cn=segu,ou=groups,dc=pnq,dc=redhat,dc=com"

[root@rheltest ~]# ldapadd -x -h localhost -p 1389 -D "cn=directory manager" -w Secret123 << EOF
> dn: cn=%segu,ou=SUDOers,ou=groups,dc=pnq,dc=redhat,dc=com
> objectClass: top
> objectClass: sudoRole
> cn: %segu
> sudoUser: %segu
> sudoHost: ALL
> sudoCommand: /usr/bin/passwd root
> sudoCommand: /usr/sbin/useradd
> sudoCommand: /usr/bin/passwd
> sudoCommand: /usr/bin/chage
> sudoCommand: /usr/sbin/userdel
> sudoCommand: /sbin/pam_tally2
> sudoOption: !authenticate
> EOF
adding new entry "cn=%segu,ou=SUDOers,ou=groups,dc=pnq,dc=redhat,dc=com"

Hence VERIFIED.