89744405e6
pipes get stated all thet time and this avoidably contributed to contention. The pipe lock is only held to accomodate MAC and to check the type. Since normally there is no probe for pipe stat depessimize this by having the flag. The pipe_state field gets modified with locks held all the time and it's not feasible to convert them to use atomic store. Move the type flag away to a separate variable as a simple cleanup and to provide stable field to read. Use short for both fields to avoid growing the struct. While here short-circuit MAC for pipe_poll as well.
260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
/*-
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* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
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* Copyright (c) 2006 SPARTA, Inc.
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* Copyright (c) 2009 Robert N. M. Watson
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project in part by Network
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* Associates Laboratories, the Security Research Division of Network
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* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
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* as part of the DARPA CHATS research program.
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*
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* This software was enhanced by SPARTA ISSO under SPAWAR contract
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* N66001-04-C-6019 ("SEFOS").
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*
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* This software was developed at the University of Cambridge Computer
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* Laboratory with support from a grant from Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/sbuf.h>
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#include <sys/sdt.h>
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#include <sys/systm.h>
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#include <sys/vnode.h>
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#include <sys/pipe.h>
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#include <sys/sysctl.h>
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#include <security/mac/mac_framework.h>
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#include <security/mac/mac_internal.h>
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#include <security/mac/mac_policy.h>
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struct label *
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mac_pipe_label_alloc(void)
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{
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struct label *label;
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label = mac_labelzone_alloc(M_WAITOK);
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MAC_POLICY_PERFORM(pipe_init_label, label);
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return (label);
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}
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void
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mac_pipe_init(struct pipepair *pp)
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{
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if (mac_labeled & MPC_OBJECT_PIPE)
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pp->pp_label = mac_pipe_label_alloc();
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else
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pp->pp_label = NULL;
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}
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void
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mac_pipe_label_free(struct label *label)
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{
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MAC_POLICY_PERFORM_NOSLEEP(pipe_destroy_label, label);
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mac_labelzone_free(label);
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}
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void
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mac_pipe_destroy(struct pipepair *pp)
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{
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if (pp->pp_label != NULL) {
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mac_pipe_label_free(pp->pp_label);
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pp->pp_label = NULL;
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}
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}
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void
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mac_pipe_copy_label(struct label *src, struct label *dest)
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{
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MAC_POLICY_PERFORM_NOSLEEP(pipe_copy_label, src, dest);
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}
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int
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mac_pipe_externalize_label(struct label *label, char *elements,
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char *outbuf, size_t outbuflen)
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{
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int error;
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MAC_POLICY_EXTERNALIZE(pipe, label, elements, outbuf, outbuflen);
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return (error);
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}
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int
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mac_pipe_internalize_label(struct label *label, char *string)
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{
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int error;
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MAC_POLICY_INTERNALIZE(pipe, label, string);
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return (error);
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}
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void
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mac_pipe_create(struct ucred *cred, struct pipepair *pp)
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{
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MAC_POLICY_PERFORM_NOSLEEP(pipe_create, cred, pp, pp->pp_label);
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}
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static void
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mac_pipe_relabel(struct ucred *cred, struct pipepair *pp,
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struct label *newlabel)
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{
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MAC_POLICY_PERFORM_NOSLEEP(pipe_relabel, cred, pp, pp->pp_label,
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newlabel);
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}
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MAC_CHECK_PROBE_DEFINE4(pipe_check_ioctl, "struct ucred *",
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"struct pipepair *", "unsigned long", "void *");
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int
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mac_pipe_check_ioctl(struct ucred *cred, struct pipepair *pp,
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unsigned long cmd, void *data)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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MAC_POLICY_CHECK_NOSLEEP(pipe_check_ioctl, cred, pp, pp->pp_label,
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cmd, data);
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MAC_CHECK_PROBE4(pipe_check_ioctl, error, cred, pp, cmd, data);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(pipe_check_poll, "struct ucred *",
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"struct pipepair *");
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int
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mac_pipe_check_poll_impl(struct ucred *cred, struct pipepair *pp)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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MAC_POLICY_CHECK_NOSLEEP(pipe_check_poll, cred, pp, pp->pp_label);
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MAC_CHECK_PROBE2(pipe_check_poll, error, cred, pp);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(pipe_check_read, "struct ucred *",
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"struct pipepair *");
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int
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mac_pipe_check_read(struct ucred *cred, struct pipepair *pp)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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MAC_POLICY_CHECK_NOSLEEP(pipe_check_read, cred, pp, pp->pp_label);
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MAC_CHECK_PROBE2(pipe_check_read, error, cred, pp);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE3(pipe_check_relabel, "struct ucred *",
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"struct pipepair *", "struct label *");
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static int
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mac_pipe_check_relabel(struct ucred *cred, struct pipepair *pp,
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struct label *newlabel)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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MAC_POLICY_CHECK_NOSLEEP(pipe_check_relabel, cred, pp, pp->pp_label,
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newlabel);
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MAC_CHECK_PROBE3(pipe_check_relabel, error, cred, pp, newlabel);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(pipe_check_stat, "struct ucred *",
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"struct pipepair *");
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int
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mac_pipe_check_stat(struct ucred *cred, struct pipepair *pp)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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MAC_POLICY_CHECK_NOSLEEP(pipe_check_stat, cred, pp, pp->pp_label);
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MAC_CHECK_PROBE2(pipe_check_stat, error, cred, pp);
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return (error);
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}
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MAC_CHECK_PROBE_DEFINE2(pipe_check_write, "struct ucred *",
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"struct pipepair *");
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int
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mac_pipe_check_write(struct ucred *cred, struct pipepair *pp)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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MAC_POLICY_CHECK_NOSLEEP(pipe_check_write, cred, pp, pp->pp_label);
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MAC_CHECK_PROBE2(pipe_check_write, error, cred, pp);
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return (error);
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}
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int
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mac_pipe_label_set(struct ucred *cred, struct pipepair *pp,
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struct label *label)
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{
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int error;
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mtx_assert(&pp->pp_mtx, MA_OWNED);
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error = mac_pipe_check_relabel(cred, pp, label);
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if (error)
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return (error);
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mac_pipe_relabel(cred, pp, label);
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return (0);
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}
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