Section 8 · System administration

capable.bt.8

Package: bpftrace

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capable.bt

NAME
SYNOPSIS
DESCRIPTION
REQUIREMENTS
EXAMPLES
FIELDS
OVERHEAD
SOURCE
OS
STABILITY
AUTHOR
SEE ALSO

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/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

OS

Linux

STABILITY

Unstable - in development.

AUTHOR

Brendan Gregg