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android / platform / external / selinux / b76eda52
commitb76eda527fcb0f878ab2d9a9fa7cf94a09be347f[log] [tgz]
authorChristian Göttsche <cgzones@googlemail.com>Thu Dec 09 17:49:10 2021 +0100
committerJames Carter <jwcart2@gmail.com>Wed Dec 15 12:51:36 2021 -0500
tree73b2c9197dd177f517546c680ca4ebb86904ade5
parentc12b7d907a4e5865a9e8ed1d30536f9760254c94 [diff]
libsepol: do not crash on class gaps

Handle gaps in the class table while printing a policy configuration.

    ==21763==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000028 (pc 0x00000055b696 bp 0x7ffe69e8ab50 sp 0x7ffe69e8aa60 T0)
    ==21763==The signal is caused by a READ memory access.
    ==21763==Hint: address points to the zero page.
        #0 0x55b696 in constraint_rules_to_strs ./libsepol/src/kernel_to_conf.c:361:14
        #1 0x55ac80 in sepol_kernel_policydb_to_conf ./libsepol/src/kernel_to_conf.c:3063:7
        #2 0x55a34f in LLVMFuzzerTestOneInput ./libsepol/fuzz/binpolicy-fuzzer.c:38:9
        #3 0x45aed3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) fuzzer.o
        #4 0x446a12 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) fuzzer.o
        #5 0x44c93b in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) fuzzer.o
        #6 0x475dd2 in main (./out/binpolicy-fuzzer+0x475dd2)
        #7 0x7fc60d39e7ec in __libc_start_main csu/../csu/libc-start.c:332:16
        #8 0x423689 in _start (./out/binpolicy-fuzzer+0x423689)

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
2 files changed
tree: 73b2c9197dd177f517546c680ca4ebb86904ade5
  1. .circleci/
  2. .github/
  3. checkpolicy/
  4. dbus/
  5. gui/
  6. libselinux/
  7. libsemanage/
  8. libsepol/
  9. mcstrans/
  10. policycoreutils/
  11. python/
  12. restorecond/
  13. sandbox/
  14. scripts/
  15. secilc/
  16. semodule-utils/
  17. .gitignore
  18. .travis.yml
  19. CleanSpec.mk
  20. CONTRIBUTING.md
  21. lgtm.yml
  22. Makefile
  23. README.md
  24. VERSION
README.md

SELinux Userspace

SELinux logo Run Tests Run SELinux testsuite in a virtual machine OSS-Fuzz Status CIFuzz Status

Please submit all bug reports and patches to selinux@vger.kernel.org.

Subscribe by sending “subscribe selinux” in the body of an email to majordomo@vger.kernel.org.

Archive of this mailing list is available on https://lore.kernel.org/selinux/.

Installation

SELinux libraries and tools are packaged in several Linux distributions:

Building and testing

Build dependencies on Fedora:

# For C libraries and programs
dnf install \
    audit-libs-devel \
    bison \
    bzip2-devel \
    CUnit-devel \
    diffutils \
    flex \
    gcc \
    gettext \
    glib2-devel \
    make \
    libcap-devel \
    libcap-ng-devel \
    pam-devel \
    pcre2-devel \
    xmlto

# For Python and Ruby bindings
dnf install \
    python3-devel \
    ruby-devel \
    swig

Build dependencies on Debian:

# For C libraries and programs
apt-get install --no-install-recommends --no-install-suggests \
    bison \
    flex \
    gawk \
    gcc \
    gettext \
    make \
    libaudit-dev \
    libbz2-dev \
    libcap-dev \
    libcap-ng-dev \
    libcunit1-dev \
    libglib2.0-dev \
    libpcre2-dev \
    pkgconf \
    python3 \
    python3-distutils \
    systemd \
    xmlto

# For Python and Ruby bindings
apt-get install --no-install-recommends --no-install-suggests \
    python3-dev \
    ruby-dev \
    swig

To build and install everything under a private directory, run:

make clean distclean

make DESTDIR=~/obj install install-rubywrap install-pywrap

On Debian PYTHON_SETUP_ARGS=--install-layout=deb needs to be set when installing the python wrappers in order to create the correct python directory structure.

To run tests with the built libraries and programs, several paths (relative to $DESTDIR) need to be added to variables $LD_LIBRARY_PATH, $PATH and $PYTHONPATH. This can be done using ./scripts/env_use_destdir:

DESTDIR=~/obj ./scripts/env_use_destdir make test

Some tests require the reference policy to be installed (for example in python/sepolgen). In order to run these ones, instructions similar to the ones in section install of ./.travis.yml can be executed.

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.

Setting CFLAGS

Setting CFLAGS during the make process will cause the omission of many defaults. While the project strives to provide a reasonable set of default flags, custom CFLAGS could break the build, or have other undesired changes on the build output. Thus, be very careful when setting CFLAGS. CFLAGS that are encouraged to be set when overriding are:

  • -fno-semantic-interposition for gcc or compilers that do not do this. clang does this by default. clang-10 and up will support passing this flag, but ignore it. Previous clang versions fail.

macOS

To install libsepol on macOS (mainly for policy analysis):

cd libsepol; make PREFIX=/usr/local install

This requires GNU coreutils:

brew install coreutils