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libsepol,libselinux,audit2allow: teach audit2why about type bounds fa…
…ilures Teach audit2why to recognize type bounds failures. This required updating libsepol sepol_compute_av_reason() to identify bounds failures, and updating libsepol context_struct_compute_av() to include the type bounds logic from the kernel. This could potentially be further augmented to provide more detailed reporting via the reason buffer to include information similar to what security_dump_masked_av() reports in the kernel. However, it is unclear if this is needed. It is already possible to get type bounds checking at policy build time by enabling expand-check=1 in /etc/selinux/semanage.conf (or by default when compiling monolithic policy). Before: type=AVC msg=audit(1480451925.038:3225): avc: denied { getattr } for pid=7118 comm="chmod" path="/home/sds/selinux-testsuite/tests/bounds/bounds_file_blue" dev="dm-2" ino=23337697 scontext=unconfined_u:unconfined_r:test_bounds_child_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:test_bounds_file_blue_t:s0 tclass=file permissive=0 Was caused by: Unknown - would be allowed by active policy Possible mismatch between this policy and the one under which the audit message was generated. Possible mismatch between current in-memory boolean settings vs. permanent ones. After: type=AVC msg=audit(1480451925.038:3225): avc: denied { getattr } for pid=7118 comm="chmod" path="/home/sds/selinux-testsuite/tests/bounds/bounds_file_blue" dev="dm-2" ino=23337697 scontext=unconfined_u:unconfined_r:test_bounds_child_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:test_bounds_file_blue_t:s0 tclass=file permissive=0 Was caused by: Typebounds violation. Add an allow rule for the parent type. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
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