1. 14 Jul, 2008 2 commits
    • Stephen Smalley's avatar
      SELinux: fix sleeping allocation in security_context_to_sid · 9a59daa0
      Stephen Smalley authored
      Fix a sleeping function called from invalid context bug by moving allocation
      to the callers prior to taking the policy rdlock.
      Signed-off-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
      Signed-off-by: default avatarJames Morris <jmorris@namei.org>
      9a59daa0
    • Stephen Smalley's avatar
      selinux: support deferred mapping of contexts · 12b29f34
      Stephen Smalley authored
      Introduce SELinux support for deferred mapping of security contexts in
      the SID table upon policy reload, and use this support for inode
      security contexts when the context is not yet valid under the current
      policy.  Only processes with CAP_MAC_ADMIN + mac_admin permission in
      policy can set undefined security contexts on inodes.  Inodes with
      such undefined contexts are treated as having the unlabeled context
      until the context becomes valid upon a policy reload that defines the
      context.  Context invalidation upon policy reload also uses this
      support to save the context information in the SID table and later
      recover it upon a subsequent policy reload that defines the context
      again.
      
      This support is to enable package managers and similar programs to set
      down file contexts unknown to the system policy at the time the file
      is created in order to better support placing loadable policy modules
      in packages and to support build systems that need to create images of
      different distro releases with different policies w/o requiring all of
      the contexts to be defined or legal in the build host policy.
      
      With this patch applied, the following sequence is possible, although
      in practice it is recommended that this permission only be allowed to
      specific program domains such as the package manager.
      
      # rmdir baz
      # rm bar
      # touch bar
      # chcon -t foo_exec_t bar # foo_exec_t is not yet defined
      chcon: failed to change context of `bar' to `system_u:object_r:foo_exec_t': Invalid argument
      # mkdir -Z system_u:object_r:foo_exec_t baz
      mkdir: failed to set default file creation context to `system_u:object_r:foo_exec_t': Invalid argument
      # cat setundefined.te
      policy_module(setundefined, 1.0)
      require {
      	type unconfined_t;
      	type unlabeled_t;
      }
      files_type(unlabeled_t)
      allow unconfined_t self:capability2 mac_admin;
      # make -f /usr/share/selinux/devel/Makefile setundefined.pp
      # semodule -i setundefined.pp
      # chcon -t foo_exec_t bar # foo_exec_t is not yet defined
      # mkdir -Z system_u:object_r:foo_exec_t baz
      # ls -Zd bar baz
      -rw-r--r--  root root system_u:object_r:unlabeled_t    bar
      drwxr-xr-x  root root system_u:object_r:unlabeled_t    baz
      # cat foo.te
      policy_module(foo, 1.0)
      type foo_exec_t;
      files_type(foo_exec_t)
      # make -f /usr/share/selinux/devel/Makefile foo.pp
      # semodule -i foo.pp # defines foo_exec_t
      # ls -Zd bar baz
      -rw-r--r--  root root user_u:object_r:foo_exec_t       bar
      drwxr-xr-x  root root system_u:object_r:foo_exec_t    baz
      # semodule -r foo
      # ls -Zd bar baz
      -rw-r--r--  root root system_u:object_r:unlabeled_t    bar
      drwxr-xr-x  root root system_u:object_r:unlabeled_t    baz
      # semodule -i foo.pp
      # ls -Zd bar baz
      -rw-r--r--  root root user_u:object_r:foo_exec_t       bar
      drwxr-xr-x  root root system_u:object_r:foo_exec_t    baz
      # semodule -r setundefined foo
      # chcon -t foo_exec_t bar # no longer defined and not allowed
      chcon: failed to change context of `bar' to `system_u:object_r:foo_exec_t': Invalid argument
      # rmdir baz
      # mkdir -Z system_u:object_r:foo_exec_t baz
      mkdir: failed to set default file creation context to `system_u:object_r:foo_exec_t': Invalid argument
      Signed-off-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
      Signed-off-by: default avatarJames Morris <jmorris@namei.org>
      12b29f34
  2. 13 Jul, 2008 6 commits
  3. 12 Jul, 2008 17 commits
  4. 11 Jul, 2008 12 commits
  5. 10 Jul, 2008 3 commits