FC2 useradd in chroot on FC5 host with SELinux

Stephen Smalley sds at tycho.nsa.gov
Wed Aug 9 12:33:14 UTC 2006


On Wed, 2006-08-09 at 09:27 +0100, Paul Howarth wrote:
> On Thu, 2006-07-13 at 17:59 +0100, Paul Howarth wrote:
> > Daniel J Walsh wrote:
> > > Paul Howarth wrote:
> > >> Daniel J Walsh wrote:
> > >>> Paul Howarth wrote:
> > >>>> I use mock to build packages for old distributions in a chroot-ed
> > >>>> environment on my FC5 box. I've pretty well got this working for all 
> > >>>> old
> > >>>> distributions now apart from FC2 (see
> > >>>> http://www.fedoraproject.org/wiki/Legacy/Mock). On FC2, the process 
> > >>>> gets
> > >>>> off to quite a good start, installing the following packages into the
> > >>>> chroot:
> > >>>>
> > >>>> ============================================================================= 
> > >>>>
> > >>>>  Package                 Arch       Version          Repository
> > >>>> Size
> > >>>> ============================================================================= 
> > >>>>
> > >>>> Installing:
> > >>>>  buildsys-build          noarch     0.5-1.CF.fc2     groups
> > >>>> 1.8 k
> > >>>> Installing for dependencies:
> > >>>>  SysVinit                i386       2.85-25          core
> > >>>> 96 k
> > >>>>  basesystem              noarch     8.0-3            core
> > >>>> 2.7 k
> > >>>>  bash                    i386       2.05b-38         core
> > >>>> 1.5 M
> > >>>>  beecrypt                i386       3.1.0-3          core
> > >>>> 64 k
> > >>>>  binutils                i386       2.15.90.0.3-5    core
> > >>>> 2.8 M
> > >>>>  buildsys-macros         noarch     2-2.fc2          groups
> > >>>> 2.1 k
> > >>>>  bzip2                   i386       1.0.2-12.1       core
> > >>>> 48 k
> > >>>>  bzip2-libs              i386       1.0.2-12.1       core
> > >>>> 32 k  chkconfig               i386       1.3.9-1.1        core
> > >>>> 99 k
> > >>>>  coreutils               i386       5.2.1-7          core
> > >>>> 2.8 M
> > >>>>  cpio                    i386       2.5-6            core
> > >>>> 45 k
> > >>>>  cpp                     i386       3.3.3-7          core
> > >>>> 1.4 M
> > >>>>  cracklib                i386       2.7-27.1         core
> > >>>> 26 k
> > >>>>  cracklib-dicts          i386       2.7-27.1         core
> > >>>> 409 k
> > >>>>  db4                     i386       4.2.52-3.1       core
> > >>>> 1.5 M
> > >>>>  dev                     i386       3.3.13-1         core
> > >>>> 3.6 M
> > >>>>  diffutils               i386       2.8.1-11         core
> > >>>> 205 k
> > >>>>  e2fsprogs               i386       1.35-7.1         core
> > >>>> 728 k
> > >>>>  elfutils-libelf         i386       0.95-2           core
> > >>>> 36 k
> > >>>>  ethtool                 i386       1.8-3.1          core
> > >>>> 48 k
> > >>>>  fedora-release          i386       2-4              core
> > >>>> 92 k
> > >>>>  file                    i386       4.07-4           core
> > >>>> 242 k
> > >>>>  filesystem              i386       2.2.4-1          core
> > >>>> 18 k
> > >>>>  findutils               i386       1:4.1.7-25       core
> > >>>> 102 k
> > >>>>  gawk                    i386       3.1.3-7          core
> > >>>> 1.5 M
> > >>>>  gcc                     i386       3.3.3-7          core
> > >>>> 3.8 M
> > >>>>  gcc-c++                 i386       3.3.3-7          core
> > >>>> 2.0 M
> > >>>>  gdbm                    i386       1.8.0-22.1       core
> > >>>> 26 k
> > >>>>  glib                    i386       1:1.2.10-12.1.1  core
> > >>>> 134 k
> > >>>>  glib2                   i386       2.4.8-1.fc2      updates-released
> > >>>> 477 k
> > >>>>  glibc                   i686       2.3.3-27.1       updates-released
> > >>>> 4.9 M
> > >>>>  glibc-common            i386       2.3.3-27.1       updates-released
> > >>>> 14 M
> > >>>>  glibc-devel             i386       2.3.3-27.1       updates-released
> > >>>> 1.9 M
> > >>>>  glibc-headers           i386       2.3.3-27.1       updates-released
> > >>>> 530 k
> > >>>>  glibc-kernheaders       i386       2.4-8.44         core
> > >>>> 697 k
> > >>>>  grep                    i386       2.5.1-26         core
> > >>>> 168 k
> > >>>>  gzip                    i386       1.3.3-12.2.legacy  updates-released
> > >>>> 88 k
> > >>>>  info                    i386       4.7-4            updates-released
> > >>>> 147 k
> > >>>>  initscripts             i386       7.55.2-1         updates-released
> > >>>> 906 k
> > >>>>  iproute                 i386       2.4.7-14         core
> > >>>> 591 k
> > >>>>  iputils                 i386       20020927-13      core
> > >>>> 92 k
> > >>>>  less                    i386       382-3            core
> > >>>> 85 k
> > >>>>  libacl                  i386       2.2.7-5          core
> > >>>> 15 k
> > >>>>  libattr                 i386       2.4.1-4          core
> > >>>> 8.6 k
> > >>>>  libgcc                  i386       3.3.3-7          core
> > >>>> 33 k
> > >>>>  libselinux              i386       1.11.4-1         core
> > >>>> 45 k
> > >>>>  libstdc++               i386       3.3.3-7          core
> > >>>> 240 k
> > >>>>  libstdc++-devel         i386       3.3.3-7          core
> > >>>> 1.3 M
> > >>>>  libtermcap              i386       2.0.8-38         core
> > >>>> 12 k
> > >>>>  make                    i386       1:3.80-3         core
> > >>>> 337 k
> > >>>>  mingetty                i386       1.07-2           core
> > >>>> 18 k
> > >>>>  mktemp                  i386       2:1.5-7          core
> > >>>> 12 k
> > >>>>  modutils                i386       2.4.26-16        core
> > >>>> 395 k
> > >>>>  ncurses                 i386       5.4-5            core
> > >>>> 1.5 M
> > >>>>  net-tools               i386       1.60-25.1        updates-released
> > >>>> 311 k
> > >>>>  pam                     i386       0.77-40          core
> > >>>> 1.9 M
> > >>>>  patch                   i386       2.5.4-19         core
> > >>>> 61 k
> > >>>>  pcre                    i386       4.5-2            core
> > >>>> 59 k
> > >>>>  perl                    i386       3:5.8.3-18       core
> > >>>> 11 M
> > >>>>  perl-Filter             i386       1.30-5           core
> > >>>> 68 k
> > >>>>  popt                    i386       1.9.1-0.4.1      updates-released
> > >>>> 61 k
> > >>>>  procps                  i386       3.2.0-1.2        updates-released
> > >>>> 176 k
> > >>>>  psmisc                  i386       21.4-2           core
> > >>>> 41 k
> > >>>>  redhat-rpm-config       noarch     8.0.28-1.1.1     core
> > >>>> 41 k
> > >>>>  rpm                     i386       4.3.1-0.4.1      updates-released
> > >>>> 2.2 M
> > >>>>  rpm-build               i386       4.3.1-0.4.1      updates-released
> > >>>> 437 k
> > >>>>  sed                     i386       4.0.8-4          core
> > >>>> 116 k
> > >>>>  setup                   noarch     2.5.33-1         core
> > >>>> 29 k
> > >>>>  shadow-utils            i386       2:4.0.3-55       updates-released
> > >>>> 671 k
> > >>>>  sysklogd                i386       1.4.1-16         core
> > >>>> 65 k
> > >>>>  tar                     i386       1.13.25-14       core
> > >>>> 351 k
> > >>>>  termcap                 noarch     11.0.1-18.1      core
> > >>>> 237 k
> > >>>>  tzdata                  noarch     2005f-1.fc2      updates-released
> > >>>> 449 k
> > >>>>  unzip                   i386       5.50-37          core
> > >>>> 139 k
> > >>>>  util-linux              i386       2.12-19          updates-released
> > >>>> 1.5 M
> > >>>>  which                   i386       2.16-2           core
> > >>>> 21 k
> > >>>>  words                   noarch     2-22             core
> > >>>> 137 k
> > >>>>  zlib                    i386       1.2.1.2-0.fc2    updates-released
> > >>>> 44 k
> > >>>>
> > >>>> After installing all of these packages successfully, the next thing 
> > >>>> that
> > >>>> happens is:
> > >>>>
> > >>>> Executing /usr/sbin/mock-helper
> > >>>> chroot /var/lib/mock/fedora-2-i386-core/root /bin/su - root -c
> > >>>> "/usr/sbin/useradd -m -u 500 -d /builddir mockbuild"
> > >>>>
> > >>>> and at that point the "useradd" process just hangs indefinitely. I'm
> > >>>> told that if SELinux is disabled (I've tried permissive mode and that
> > >>>> doesn't help), this works. I can't see any AVCs in the logs.
> > >>>>
> > >>>> Any ideas what might be causing this and how it might be fixed?
> > >>
> > >>
> > >>> In fc2 you should disable SELinux.
> > >>
> > >> I'm running this on FC5; what I'm trying to do is set up a chroot with 
> > >> FC2 packages. This includes the FC2 version of useradd, and it's this 
> > >> that's hanging when run in the chroot.
> > >>
> > >> I'd happily give things in the chroot the impression that SELinux is 
> > >> disabled (I believe mock actually does this already) but I *really* 
> > >> don't want to disable SELinux on my FC5 host.
> > >>
> > >> Paul.
> > > I have no idea why this would happen then. And I am not sure I believe 
> > > them when they say that if SELinux was disabled this would work 
> > > differently, unless there is a kernel bug.  You are not seeing avc 
> > > messages, correct?
> > 
> > Correct.
> > 
> > > Usually if it does not work in permissive mode it is 
> > > not an SELinux problem.
> > 
> > *Usually*...
> > 
> > I guess I'll have to bite the bullet and try it with SELinux disabled 
> > (so I'll have to relabel my desktop box afterwards, sigh). I know of two 
> > people that have this working with SELinux disabled, and I vaguely 
> > recall it working for me when I was first trying this (with SELinux 
> > disabled, probably a year ago). I've got it working for everything from 
> > RHL7 through to FC5 targets apart from FC2, so I doubt I'm doing 
> > something significantly wrong.
> 
> I've now got a nice shiny new x86_64 box so at last I've been able to
> sacrifice my old build system by disabling SELinux on it. My
> recollection was correct - the mock build for FC2 worked just fine with
> SELinux disabled.
> 
> Any thoughts on what might be going on here?

Did you ever try stracing the useradd process to see what it is doing at
the point where it hangs?

-- 
Stephen Smalley
National Security Agency




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