$FreeBSD$
Inter-Process Authorization Test Suite
Robert Watson, TrustedBSD Project
This test suite attempts to determine the behavior of inter-process
authorization policy present in the kernel. It analyzes a series of
important scenarios using specifically crafted process credentials
and a set of operations. It then reports on any divergence from the
expected results.
Test operations:
ptrace cred1 attempts ptrace attach to cred2
sighup cred1 attempts SIGHUP of cred2
sigsegv cred1 attempts SIGSEGV of cred2
see cred1 attempts getpriority() on cred2
sched cred1 attempts setpriority() on cred2
Test scenarioes:
priv on priv root process on another root process
priv on unpriv1 root process on a non-root process
unpriv1 on priv non-root process on a root process
unpriv1 on unpriv1 non-root process on a similar non-root process
unpriv1 on unpriv2 non-root process on a different non-root process
unpriv1 on daemon1 non-root process on a root daemon process acting with
same non-root effective credentials
unpriv1 on daemon2 non-root process on a root daemon process acting with
different non-root effective credentials
unpriv1 on setuid1 non-root process on a setuid-root process with same
non-root real credentials
unpriv1 on setuid2 non-root process on a setuid-root process with
different non-root real credentials
The credential elements supported by the test suite are:
effective uid
real uid
saved uid
P_SUGID flag
Other untested aspects of interest include groups, as well as session
relationship. Other test operations that might be of interest are SIGCONT,
and SIGIO.
The current set of tests includes some tests where normally the P_SUGID
flag is set, but isn't in the test. The result is that some tests fail
that may not reflect real-world software configurations. However, they
do point to possible changes that could be made in the authorization system
to improve resilience to failure or violation of invariants.
These tests rely on __setugid(), a system call enabled using options
REGRESSION.
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