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James Carter da51020d6f libsepol/cil: Use an empty list to represent an unknown permission 
Nicolas Iooss found while fuzzing secilc with AFL that the statement
"(classpermissionset CPERM (CLASS (and unknow PERM)))" will cause a
segfault.

In order to support a policy module package using a permission that
does not exist on the system it is loaded on, CIL will only give a
warning when it fails to resolve an unknown permission. CIL itself will
just ignore the unknown permission. This means that an expression like
"(and UNKNOWN p1)" will look like "(and p1)" to CIL, but, since syntax
checking has already been done, CIL won't know that the expression is not
well-formed. When the expression is evaluated a segfault will occur
because all expressions are assumed to be well-formed at evaluation time.

Use an empty list to represent an unknown permission so that expressions
will continue to be well-formed and expression evaluation will work but
the unknown permission will still be ignored.

Signed-off-by: James Carter <jwcart2@tycho.nsa.gov>
2016-10-19 10:07:43 -04:00
checkpolicy Update VERSION and ChangeLog files for 2.6 final release. 2016-10-14 11:31:26 -04:00
libselinux Updated libselinux and libsepol ChangeLogs 2016-10-18 14:03:21 -04:00
libsemanage Updated libsemanage ChangeLog 2016-10-14 13:41:04 -04:00
libsepol libsepol/cil: Use an empty list to represent an unknown permission 2016-10-19 10:07:43 -04:00
policycoreutils Update VERSION and ChangeLog files for 2.6 final release. 2016-10-14 11:31:26 -04:00
scripts scripts/release: cleanups 2016-10-14 11:47:29 -04:00
secilc Update VERSION and ChangeLog files for 2.6 final release. 2016-10-14 11:31:26 -04:00
sepolgen Update VERSION and ChangeLog files for 2.6 final release. 2016-10-14 11:31:26 -04:00
.gitignore global: gitignore: add a couple of more editor backup filetypes 2013-02-01 12:14:57 -05:00
CleanSpec.mk Add empty top level Android.mk / CleanSpec.mk files 2015-04-16 07:54:09 -04:00
Makefile Makefile: make distclean target work 2016-09-29 10:48:14 -04:00
README Add redhat-rpm-config as a build dependency on Fedora. 2016-05-04 15:54:27 -04:00

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 xmlto redhat-rpm-config

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.