tracingpolicy: trace capset system call

Produced event:
    ...
    "function_name": "security_capset",
    "args": [
      {
        "process_credentials_arg": {
      {
        "cap_effective_arg": "000001ffffffffff"
      },
      {
        "cap_inheritable_arg": "0000000000000000"
      },
      {
        "cap_permitted_arg": "000001ffffffffff"
      }
    ],
    "return": {
      "int_arg": 0
    },
    "action": "KPROBE_ACTION_POST",
    "policy_name": "privileges-raise",
    "return_action": "KPROBE_ACTION_POST",
    "message": "Process changed its capabilities using capset system call"

Signed-off-by: Djalal Harouni <[email protected]>

examples/policylibrary/privileges/privileges-raise.yaml

@@ -3,7 +3,9 @@
 #
 # 1. Unprivileged creating user namespace to gain new capabilities.
 #
-# 2. Change their uids/gids to user root.
+# 2. Setting or changing capabilities using the capset system call.
+#
+# 3. Change their uids/gids to user root.
 #
 #  __sys_setuid
 #    - __x64_sys_setuid
@@ -62,6 +64,49 @@ metadata:
     description: "Detects privileges raising operations"
 spec:
   kprobes:
+  - call: "security_capset"
+    syscall: false
+    return: true
+    message: "Process changed its capabilities using capset system call"
+    args:
+    - index: 0
+      type: "nop"
+    - index: 1
+      type: "cred"
+    - index: 2
+      type: "cap_effective"
+    - index: 3
+      type: "cap_inheritable"
+    - index: 4
+      type: "cap_permitted"
+    returnArg:
+      index: 0
+      type: "int"
+    selectors:
+    - matchArgs:
+      - index: 2
+        operator: "NotEqual"
+        values:
+        - "0"
+      matchActions:
+      - action: Post
+        rateLimit: "1m"  # Rate limit messages to 1min
+    - matchArgs:
+      - index: 3
+        operator: "NotEqual"
+        values:
+        - "0"
+      matchActions:
+      - action: Post
+        rateLimit: "1m"  # Rate limit messages to 1min
+    - matchArgs:
+      - index: 4
+        operator: "NotEqual"
+        values:
+        - "0"
+      matchActions:
+      - action: Post
+        rateLimit: "1m"  # Rate limit messages to 1min
   - call: "create_user_ns"
     syscall: false
     return: true