capable.bt.bt8
Trace security capability checks (cap_capable()).
Usage
capable.bt
Overview
This traces security capability checks in the kernel, and prints details for each call. This can be useful for general debugging, and also security enforcement: determining a white list of capabilities an application needs.
Since this uses BPF, only the root user can use this tool.
Requirements
CONFIG_BPF, bpftrace.
Examples
- Trace all capability checks system-wide:
-
#
capable.bt
Fields
- TIME(s)
-
Time of capability check: HH:MM:SS.
- UID
-
User ID.
- PID
-
Process ID.
- COMM
-
Process name. CAP Capability number. NAME Capability name. See capabilities(7) for descriptions.
- AUDIT
-
Whether this was an audit event.
Overhead
This adds low-overhead instrumentation to capability checks, which are expected to be low frequency, however, that depends on the application. Test in a lab environment before use.
Source
This is from bpftrace.
-
https://github.com/iovisor/bpftrace
Also look in the bpftrace distribution for a companion _examples.txt file containing example usage, output, and commentary for this tool.
This is a bpftrace version of the bcc tool of the same name. The bcc tool provides options to customize the output.
-
https://github.com/iovisor/bcc
OS
Linux
Stability
Unstable - in development.