capable.bt - Trace security capability checks (cap_capable()).
Contents
Description
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.
Examples
Trace all capability checks system-wide:
# capable.btFields
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.
Name
capable.bt - Trace security capability checks (cap_capable()).
Os
Linux
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.
Requirements
CONFIG_BPF, bpftrace.
See Also
capabilities(7) USER COMMANDS 2018-09-08 capable.bt(8)
Source
This is from bpftrace.
https://github.com/bpftrace/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
Stability
Unstable - in development.
Synopsis
capable.bt
