** Description changed:
I have found a combination of ACLs that, when set on a file on an Active
- Directory joined (using Centrify Express) Ubuntu 10.04 server, will
- crash the getfacl program upon reading.
+ Directory joined Ubuntu 10.04 server, will crash the getfacl program
+ upon reading the ACL entries.
- The program crash seems to appear only when user and group names are in
- an unusual format, as when using AD integration tools such as
- CentrifyDC Express or Likewise-Open 6.
+ The crash appears under the following conditions:
+ 1) getfacl is about to list effective permissions (i.e. limited by mask) for
at least two ACL entries.
+ 2) At least one of these entries has a user/group name longer than 32
characters.
+ 3) The output of getfacl is not redirected or piped to another program/file.
- Running the test on a separate, non-AD joined host, using regular local user
and groups, does not yield errors.
- The error only seems to appear on certain combinations of user and group
names.
+ Normally, user/group names longer than 32 characters are prevented from
+ being created on the local system, but they are possible when using
+ central authentication tools such as Centrify DirectControl and Likewise
+ Open.
- Examples of the unusual format I talk about:
- - DOMAIN\\this_is_a_rather_long_name
- - this_is_a_rather_long_n...@domain.tld
+ The crash happens when effective permissions are to be listed, and only when
the output of getfacl is written directly to terminal.Running the test on a
separate, non-AD joined host, using regular local users and groups of maximum
32 characters, does not yield any errors.
+ I have tested and confirmed this bug on two independent systems, both running
Ubuntu 10.04 Server, with one using CentrifyDC Express 4.4.3 for AD integration
and the other one using Likewise-Open 6.
- Quite interesting, the bug does not appear when the output of getfacl is
- piped to another program or redirected to a file.
=== HOW TO REPRODUCE ===
- Since the bug does not appear when using locally valid names, it may be
required to install centrifydc express or likewise-open and set up an Active
Directory environment for testing... or use something else that produces the
unusual format in user/group names (perhaps LDAP can be used?).
+ Since the bug does not appear when using locally valid names, it may be
required to install centrifydc, likewise-open or another tool in order to
create a test environment with user/group names longer than 32 characters.
Perhaps LDAP can be used too?
This example uses Centrify DirectControl 4.4.3 Express for AD
integration.
mkdir testdir
touch testdir/testfile
setfacl -Rd -m user:p...@civil.aau.dk:rwx -m
group:vhost_arch-civil-aau-dk_f...@civil.aau.dk:rwx testdir/
setfacl -Rn -m user:p...@civil.aau.dk:rwx -m
group:vhost_arch-civil-aau-dk_f...@civil.aau.dk:rwx testdir/
getfacl testdir# crash, getfacl_testdir_noredirect_crash.log
getfacl testdir getfacl_testdir_redirect_nocrash.log
getfacl testdir/testfile# crash, getfacl_testfile_noredirect_crash.log
getfacl testdir/testfile getfacl_testfile_redirect_nocrash.log
=== ATTACHED LOGS ===
getfacl_testdir_noredirect_crash.log(copied from terminal)
getfacl_testdir_redirect_nocrash.log(redirected to log file)
getfacl_testfile_noredirect_crash.log(copied from terminal)
getfacl_testfile_redirect_nocrash.log(redirected to log file)
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: acl 2.2.49-2
ProcVersionSignature: Ubuntu 2.6.32-36.79-server 2.6.32.46+drm33.20
Uname: Linux 2.6.32-36-server x86_64
Architecture: amd64
Date: Mon Dec 5 14:43:30 2011
InstallationMedia: Ubuntu-Server 10.04 LTS Lucid Lynx - Release amd64
(20100427)
ProcEnviron:
PATH=(custom, no user)
LANG=en_DK.UTF-8
SHELL=/bin/bash
SourcePackage: acl
** Description changed:
I have found a combination of ACLs that, when set on a file on an Active
Directory joined Ubuntu 10.04 server, will crash the getfacl program
upon reading the ACL entries.
The crash appears under the following conditions:
1) getfacl is about to list effective permissions (i.e. limited by mask) for
at least two ACL entries.
2) At least one of these entries has a user/group name longer than 32
characters.
- 3) The output of getfacl is not redirected or piped to another program/file.
+ 3) The output of getfacl is not redirected nor piped to another program/file.
Normally, user/group names longer than 32 characters are prevented from
being created on the local system, but they are possible when using
central authentication tools such as Centrify DirectControl and Likewise
Open.
- The crash happens when effective permissions are to be listed, and only when
the output of getfacl is written directly to terminal.Running the test on a
separate, non-AD joined host, using regular local users and groups of maximum
32 characters,
