NAME

capable.bt - Trace security capability checks (cap_capable()).

SYNOPSIS

capable.bt

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.

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.

AUTHOR

Brendan Gregg