NAME

proccontrol —

Control some process execution aspects

SYNOPSIS

proccontrol -m mode [-s control] [-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.

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

The proccontrol utility exits 0 on success, and >0 if an error occurs.

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

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.