NAME

paxctl — list and modify PaX flags associated with an ELF program

SYNOPSIS

paxctl

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.

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 <elad@NetBSD.org> Christos Zoulas <christos@NetBSD.org>

BUGS

The paxctl utility currently uses elf(5) “note” sections to mark executables as PaX Segvguard 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.