PROCCONTROL(1)

NAME
proccontrol - Control some process execution aspects

SYNOPSIS
proccontrol -m mode -s control -p pid | command
proccontrol -m mode -q [-p pid | command]

DESCRIPTION
The proccontrol command modifies the execution parameter of existing process specified by the pid argument, or starts execution of the new program command with the execution parameter set for it.

Which execution parameter is changed, selected by the mandatory parameter mode. Possible values for mode are:

aslr
    Control the Address Space Layout Randomization. Only applicable to the new process spawned.

trace
    Control the permission for debuggers to attach. Note that process is only allowed to enable tracing for itself, not for any other process.

trapcap
    Controls the signalling of capability mode access violations.

protmax
    Controls the implicit PROT_MAX application for mmap(2).

nonewprivs
    Controls disabling the setuid and sgid bits for execve(2).

wxmap
    Controls the write exclusive execute mode for mappings.

kpti
    Controls the KPTI enable, AMD64 only.

la48
    Control limiting usermode process address space to 48 bits of address, AMD64 only, on machines capable of 57-bit addressing.

logsigexit
    Controls the logging of exits due to a signal that would normally cause a core dump.

The control specifies if the selected mode should be enabled or disabled. Possible values are enable and disable, with the default value being enable if not specified. See procctl(2) for detailed description of each mode effects and interaction with other process control facilities.

The -q switch makes the utility query and print the current setting for the selected mode. The -q requires the query target process specification with -p.

EXIT STATUS

EXAMPLES

•   To disable debuggers attachment to the process 1020, execute
        proccontrol -m trace -s disable -p 1020

•   To execute the uniq(1) program in a mode where capability access violations cause SIGTRAP delivery, do
        proccontrol -m trapcap uniq

•   To query the current ASLR enablement mode for the running process 1020, do
        proccontrol -m aslr -q -p 1020

SEE ALSO
kill(2), procctl(2), ptrace(2), mitigations(7)

HISTORY
The proccontrol command appeared in FreeBSD 10.0.

AUTHORS
The proccontrol command and this manual page were written by Konstantin Belousov <kib@freebsd.org> under sponsorship from The FreeBSD Foundation.