NAME

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

SYNOPSIS

       capable [-h] [-v] [-p PID] [-K] [-U] [-x] [--cgroupmap MAPPATH]
                  [--mntnsmap MAPPATH] [--unique]

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, bcc.

OPTIONS

       -h USAGE message.

       -v     Include non-audit capability checks. These are those deemed not interesting and not
              necessary to audit, such as CAP_SYS_ADMIN checks on memory allocation to affect the
              behavior of overcommit.

       -K     Include kernel stack traces to the output.

       -U     Include user-space stack traces to the output.

       -x     Show extra fields in TID and INSETID columns.

       --cgroupmap MAPPATH
              Trace cgroups in this BPF map only (filtered in-kernel).

       --mntnsmap  MAPPATH
              Trace mount namespaces in this BPF map only (filtered in-kernel).

       --unique
              Don't repeat stacks for the same PID or cgroup.

EXAMPLES

       Trace all capability checks system-wide:
              # capable

       Trace capability checks for PID 181:
              # capable -p 181

       Trace capability checks in a set of cgroups only (see special_filtering.md
              from bcc sources for more details): # capable --cgroupmap /sys/fs/bpf/test01

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. Use  -v  to  include  non-audit  events.   INSETID
              Whether the INSETID bit was set (Linux >= 5.1).

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 bcc.

              https://github.com/iovisor/bcc

       Also look in the bcc distribution for a companion _examples.txt  file  containing  example
       usage, output, and commentary for this tool.

OS

       Linux

STABILITY

       Unstable - in development.

AUTHOR

       Brendan Gregg

SEE ALSO

       capabilities(7)