Examine the server process GOT for signs of tampering.

Sanity/got-audit/got-audit.gdb

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+gef config gef.disable_color True
+got-audit --all

Sanity/got-audit/main.fmf

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+summary: Audit the GOT for signs of tampering
+description: |
+  Pointers in the server process GOT will be checked to ensure that
+  each function pointer's value is within a shared object file
+  that exports a symbol of that name, and that no shared object
+  files export conflicting symbols.
+contact: Gordon Messmer <gordon.messmer@gmail.com>
+require+:
+  - gdb-gef           # needed to test got-audit
+test: ./runtest.sh
+framework: beakerlib
+

Sanity/got-audit/runtest.sh

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+#!/bin/bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   runtest.sh of /CoreOS/cups/Sanity/got-audit
+#   Description: Check pointers in the server process GOT for signs of tampering
+#   Author: Gordon Messmer <gordon.messmer@gmail.com>
+#
+
+# Include Beaker environment
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+rlJournalStart
+    rlPhaseStartSetup
+        rlServiceStart cups
+        rlRun "TestDir=\$(pwd)"
+        rlRun "TmpDir=\$(mktemp -d)" 0 "Creating tmp directory"
+        rlRun "pushd $TmpDir"
+        rlRun "auditfile=\$(mktemp --tmpdir=${TmpDir})"
+    rlPhaseEnd
+
+    rlPhaseStartTest "Run GEF got-audit"
+        rlRun "SERVICE_PID=\$( systemctl show --property=MainPID cups.service | cut -f2 -d= )"
+        rlRun "echo SERVICE_PID is '$SERVICE_PID'"
+        [ -n "$SERVICE_PID" ] || rlFail "No service pid was found"
+        rlRun "gdb-gef --pid '$SERVICE_PID' --command='$TestDir'/got-audit.gdb --batch > '$auditfile'"
+        # Basic test: ensure that at least one symbol is found in libc.so,
+        #  to verify that the report looks plausible.
+        rlAssertGrep " : /.*/libc.so" "$auditfile"
+        # Ensure the got-audit did not report any errors
+        rlAssertNotGrep " :: ERROR" "$auditfile"
+        rlRun "cp '$auditfile' '$TMT_TEST_DATA'/got-audit.txt"
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlServiceRestore cups
+        rlRun "popd"
+        rlRun "rm -r $TmpDir" 0 "Removing tmp directory"
+    rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd