paxctl(8) - NetBSD Manual Pages

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PAXCTL(8)               NetBSD 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.

     To view existing flags on a program, execute paxctl without any flags.

     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).
     A       Explicitly enable PaX ASLR.

     g       Explicitly disable PaX Segvguard.
     G       Explicitly enable PaX Segvguard.

     m       Explicitly disable PaX MPROTECT (mprotect(2) restrictions).
     M       Explicitly enable PaX MPROTECT.


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>


RESTRICTIONS

     The paxctl utility uses elf(5) note sections to mark executables with PaX
     flags.  This means that, as one might expect, the PaX settings do not
     persist if the program file is replaced.  It also means that running
     paxctl changes the target executable, which can be undesirable in produc-
     tion.  In general, paxctl settings should be applied to programs at build
     time.

NetBSD 10.99                    August 20, 2023                   NetBSD 10.99