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File: [local] / src / usr.bin / sndiod / fdpass.h (download)
Revision 1.1, Sun Dec 20 11:38:33 2015 UTC (8 years, 5 months ago) by ratchov
In case of a bug in sndiod, an attacker (a local user) could run arbitrary code as user _sndio, i.e. get a second uid. Mitigate the risk by implementing initial privilege separation as follows. Break sndiod in two processes: a chroot()ed "worker" process processing input, and a non-chroot()ed "helper" process opening devices and passing descriptors to the worker. With help from benno, claudio, semarie and gilles. ok benno, semarie and tb |
/* $OpenBSD: fdpass.h,v 1.1 2015/12/20 11:38:33 ratchov Exp $ */ /* * Copyright (c) 2015 Alexandre Ratchov <alex@caoua.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #ifndef FDPASS_H #define FDPASS_H struct fileops; struct fdpass *fdpass_new(int sock, struct fileops *ops); void fdpass_close(struct fdpass *f); extern struct fileops worker_fileops, helper_fileops; extern struct fdpass *fdpass_peer; struct sio_hdl *fdpass_sio_open(int, unsigned int); struct mio_hdl *fdpass_mio_open(int, unsigned int); #endif /* !defined(FDPASS_H) */