PAXCTL(8) FreeBSD System Manager's Manual PAXCTL(8)
NAME
paxctl - list and modify PaX flags associated with an ELF program
SYNOPSIS
paxctl [-0 | flags] program ...
DESCRIPTION
The paxctl utility is used to list and manipulate PaX flags associated
with an ELF program. The PaX flags signify to the loader the privilege
protections to be applied to mapped memory pages, and fuller explanations
of the specific protections can be found in the security(7) manpage.
If -0 option is specified, all PaX flags (including reserved bits) are
cleared. Otherwise, each flag can be prefixed either with a "+" or a "-"
sign to add or remove the flag, respectively.
The following flags are available:
a Explicitly disable PaX ASLR (Address Space Layout Randomization)
for program.
A Explicitly enable PaX ASLR for program.
g Explicitly disable PaX Segvguard for program.
G Explicitly enable PaX Segvguard for program.
m Explicitly disable PaX MPROTECT (mprotect(2) restrictions) for
program.
M Explicitly enable PaX MPROTECT (mprotect(2) restrictions) for
program.
To view existing flags on a file, execute paxctl without any flags.
SEE ALSO
mprotect(2), sysctl(3), options(4), elf(5), security(7), sysctl(8),
fileassoc(9)
HISTORY
The paxctl utility first appeared in NetBSD 4.0.
The paxctl utility is modeled after a tool of the same name available for
Linux from the PaX project.
AUTHORS
Elad Efrat <
[email protected]>
Christos Zoulas <
[email protected]>
BUGS
The paxctl utility currently uses elf(5) "note" sections to mark
executables as having PaX flags enabled. This will be done using
fileassoc(9) in the future so that we can control who does the marking
and not altering the binary file signature. (Note this also means that
at present any flags set do not survive binary file upgrades.)
FreeBSD 14.1-RELEASE-p8 June 23, 2023 FreeBSD 14.1-RELEASE-p8