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.Dd October 5, 2023 .Dt PROCCONTROL 1 .Os .Sh NAME .Nm proccontrol .Nd Control some process execution aspects .Sh SYNOPSIS .Nm .Fl m Ar mode .Op Fl s Ar control .Op Fl q .Fl p Ar pid | command .Sh DESCRIPTION The .Nm command modifies the execution parameter of existing process specified by the .Ar pid argument, or starts execution of the new program .Ar command with the execution parameter set for it.
p Which execution parameter is changed, selected by the mandatory parameter .Ar mode . Possible values for .Ar mode are: l -tag -width trapcap t Ar aslr Control the Address Space Layout Randomization. Only applicable to the new process spawned. t Ar trace Control the permission for debuggers to attach. Note that process is only allowed to enable tracing for itself, not for any other process. t Ar trapcap Controls the signalling of capability mode access violations. t Ar protmax Controls the implicit PROT_MAX application for .Xr mmap 2 . t Ar nonewprivs Controls disabling the setuid and sgid bits for .Xr execve 2 . t Ar wxmap Controls the write exclusive execute mode for mappings. t Ar kpti Controls the KPTI enable, AMD64 only. t Ar la48 Control limiting usermode process address space to 48 bits of address, AMD64 only, on machines capable of 57-bit addressing. .El
p The .Ar control specifies if the selected .Ar mode should be enabled or disabled. Possible values are .Ar enable and .Ar disable , with the default value being .Ar enable if not specified. See .Xr procctl 2 for detailed description of each mode effects and interaction with other process control facilities.
p The .Fl q switch makes the utility query and print the current setting for the selected mode. The .Fl q requires the query target process specification with .Fl p . .Sh EXIT STATUS .Ex -std .Sh EXAMPLES l -bullet t To disable debuggers attachment to the process 1020, execute .Dl "proccontrol -m trace -s disable -p 1020" t To execute the .Xr uniq 1 program in a mode where capability access violations cause .Dv SIGTRAP delivery, do .Dl "proccontrol -m trapcap uniq" t To query the current ASLR enablement mode for the running process 1020, do .Dl "proccontrol -m aslr -q -p 1020" .El .Sh SEE ALSO .Xr kill 2 , .Xr procctl 2 , .Xr ptrace 2 , .Xr mitigations 7 .Sh HISTORY The .Nm command appeared in .Fx 10.0 . .Sh AUTHORS The .Nm command and this manual page were written by .An Konstantin Belousov Aq Mt kib@freebsd.org under sponsorship from The FreeBSD Foundation.