Squash w/ test commit.

test/falco_tests_exceptions.yaml

@@ -306,4 +306,18 @@ trace_files: !mux
       - rules/exceptions/rule_exception_values_list.yaml
     trace_file: trace_files/cat_write.scap
 
+  rule_exception_single_field:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_single_field.yaml
+    trace_file: trace_files/cat_write.scap
+
+  rule_exception_single_field_append:
+    detect: False
+    detect_level: WARNING
+    rules_file:
+      - rules/exceptions/rule_exception_single_field_append.yaml
+    trace_file: trace_files/cat_write.scap
+
 

test/rules/exceptions/rule_exception_single_field.yaml

@@ -0,0 +1,30 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_cmdline
+      fields: proc.cmdline
+      comps: in
+      values:
+        - cat /dev/zero
+        - "cat /dev/null"
+  priority: WARNING
+

test/rules/exceptions/rule_exception_single_field_append.yaml

@@ -0,0 +1,37 @@
+#
+# Copyright (C) 2020 The Falco Authors.
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+- rule: Open From Cat
+  desc: A process named cat does an open
+  condition: evt.type=open and proc.name=cat
+  output: "An open was seen (command=%proc.cmdline)"
+  exceptions:
+    - name: proc_cmdline
+      fields: proc.cmdline
+      comps: in
+      values:
+        - cat /dev/zero
+  priority: WARNING
+
+- rule: Open From Cat
+  exceptions:
+    - name: proc_cmdline
+      values:
+        - "cat /dev/null"
+  append: true
+
+