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Stephen Smalley b408d72ca9 libselinux: flush the class/perm string mapping cache on policy reload 
This improves the robustness of programs using selinux_check_access()
in the face of policy updates that alter the values of the class or
permissions that they are checking.  Otherwise, a policy update can
trigger false permission denials, as in
https://bugzilla.redhat.com/show_bug.cgi?id=1264051

Changes to the userspace class/permission definitions should still be
handled with care, as not all userspace object managers have been converted
to use selinux_check_access() and even those that do use it are still not
entirely safe against an interleaving of a policy reload and a call to
selinux_check_access().  The change does however address the issue in
the above bug and avoids the need to restart systemd.

This change restores the flush_class_cache() function that was removed in
commit 435fae64a9 ("libselinux: Remove unused flush_class_cache method")
because it had no users at the time, but makes it hidden to avoid exposing
it as part of the libselinux ABI.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
2015-09-22 12:16:44 -04:00
checkpolicy Updated libsepol and checkpolicy ChangeLogs. 2015-09-22 10:54:10 -04:00
libselinux libselinux: flush the class/perm string mapping cache on policy reload 2015-09-22 12:16:44 -04:00
libsemanage Update libsemanage ChangeLog. 2015-09-03 15:41:39 -04:00
libsepol Updated libsepol and checkpolicy ChangeLogs. 2015-09-22 10:54:10 -04:00
policycoreutils Updated policycoreutils ChangeLog. 2015-08-25 15:07:52 -04:00
scripts Add secilc to release script. 2015-03-31 12:41:28 -04:00
secilc libsepol/cil: Add userattribute{set} functionality 2015-09-11 09:07:46 -04:00
sepolgen Updated sepolgen ChangeLog. 2015-08-05 15:16:18 -04:00
.gitignore global: gitignore: add a couple of more editor backup filetypes 2013-02-01 12:14:57 -05:00
Android.mk Add empty top level Android.mk / CleanSpec.mk files 2015-04-16 07:54:09 -04:00
CleanSpec.mk Add empty top level Android.mk / CleanSpec.mk files 2015-04-16 07:54:09 -04:00
Makefile libsepol: Move secilc out of libsepol 2015-03-31 12:31:38 -04:00
README Add further build dependencies. 2015-02-23 09:08:13 -05:00

README 

Please submit all bug reports and patches to selinux@tycho.nsa.gov.
Subscribe via selinux-join@tycho.nsa.gov.

Build dependencies on Fedora:
yum install audit-libs-devel bison bzip2-devel dbus-devel dbus-glib-devel flex flex-devel flex-static glib2-devel libcap-devel libcap-ng-devel pam-devel pcre-devel python-devel setools-devel swig ustr-devel

To build and install everything under a private directory, run:
make DESTDIR=~/obj install install-pywrap

To install as the default system libraries and binaries
(overwriting any previously installed ones - dangerous!),
on x86_64, run:
make LIBDIR=/usr/lib64 SHLIBDIR=/lib64 install install-pywrap relabel
or on x86 (32-bit), run:
make install install-pywrap relabel

This may render your system unusable if the upstream SELinux userspace
lacks library functions or other dependencies relied upon by your
distribution.  If it breaks, you get to keep both pieces.