KASSIBER(1) - FreeBSD General Commands Manual

NAME

kassiber - Inject an executable from the FreeBSD host into a jail

SYNOPSIS

kassiber [-h] [-a] [-A] [-n] [-r rtld] [-p path] [-l lib] [-j jail] [-c chroot] cmd [arg ...]

DESCRIPTION

The kassiber command opens the runtime loader and an executable, loads the required libraries, attaches itself to a jail and/or chroot directory before executing the loaded command.

The following options are available:

-h

Print the usage message and exit.

-a

Infer the required libraries using the runtime loader's tracing support. Put inferred libraries before manually specified libraries.

-A

Infer the required libraries using the runtime loader's tracing support. Put inferred libraries after manually specified libraries.

-n

Don't infer the required libraries. Only manually specified libraries will be loaded.

-r rtld

Override the the default runtime loader path.

-l lib

Manually specify a library to preload. Can be specified more than once.

-j jail

Specify the jail to attach to. The command attaches to the jail before it chroots itself.

-c chroot

Set the chroot directory path. The command chroots itself after it attached to the jail.

CAVEATS

Many programs rely on access to further files besides just their linked libraries so will be unable to function usefully from within the jail.

EXIT STATUS

The kassiber command exits with EX_NOINPUT, EX_OSERR, or EX_CONFIG on errors otherwise it replaces itself with the invoked executable.

SEE ALSO

rtld(1), jexec(8), chroot(8)

AUTHORS

This manual page was written by Jan Bramkamp <crest+kassiber@rlwinm.de>.

FreeBSD 15.0-PRERELEASE - July 12, 2025 - KASSIBER(1)