PROCCONTROL(1)          FreeBSD General Commands Manual         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

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

EXAMPLES

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

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

     o   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.

FreeBSD 15.1-STABLE-HBSD       December 14, 2024                PROCCONTROL(1)