freebsd-dev/sys/security/mac/mac_sysv_shm.c
Attilio Rao 54366c0bd7 - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging
option, unbreak the lock tracing release semantic by embedding
  calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined
  version of the releasing functions for mutex, rwlock and sxlock.
  Failing to do so skips the lockstat_probe_func invokation for
  unlocking.
- As part of the LOCKSTAT support is inlined in mutex operation, for
  kernel compiled without lock debugging options, potentially every
  consumer must be compiled including opt_kdtrace.h.
  Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the
  dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES
  is linked there and it is only used as a compile-time stub [0].

[0] immediately shows some new bug as DTRACE-derived support for debug
in sfxge is broken and it was never really tested.  As it was not
including correctly opt_kdtrace.h before it was never enabled so it
was kept broken for a while.  Fix this by using a protection stub,
leaving sfxge driver authors the responsibility for fixing it
appropriately [1].

Sponsored by:	EMC / Isilon storage division
Discussed with:	rstone
[0] Reported by:	rstone
[1] Discussed with:	philip
2013-11-25 07:38:45 +00:00

181 lines
4.9 KiB
C

/*-
* Copyright (c) 2003-2004 Networks Associates Technology, Inc.
* Copyright (c) 2006 SPARTA, Inc.
* Copyright (c) 2009 Robert N. M. Watson
* All rights reserved.
*
* This software was developed for the FreeBSD Project in part by Network
* Associates Laboratories, the Security Research Division of Network
* Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"),
* as part of the DARPA CHATS research program.
*
* This software was enhanced by SPARTA ISSO under SPAWAR contract
* N66001-04-C-6019 ("SEFOS").
*
* This software was developed at the University of Cambridge Computer
* Laboratory with support from a grant from Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/sbuf.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/namei.h>
#include <sys/sdt.h>
#include <sys/sysctl.h>
#include <sys/shm.h>
#include <security/mac/mac_framework.h>
#include <security/mac/mac_internal.h>
#include <security/mac/mac_policy.h>
static struct label *
mac_sysv_shm_label_alloc(void)
{
struct label *label;
label = mac_labelzone_alloc(M_WAITOK);
MAC_POLICY_PERFORM(sysvshm_init_label, label);
return (label);
}
void
mac_sysvshm_init(struct shmid_kernel *shmsegptr)
{
if (mac_labeled & MPC_OBJECT_SYSVSHM)
shmsegptr->label = mac_sysv_shm_label_alloc();
else
shmsegptr->label = NULL;
}
static void
mac_sysv_shm_label_free(struct label *label)
{
MAC_POLICY_PERFORM_NOSLEEP(sysvshm_destroy_label, label);
mac_labelzone_free(label);
}
void
mac_sysvshm_destroy(struct shmid_kernel *shmsegptr)
{
if (shmsegptr->label != NULL) {
mac_sysv_shm_label_free(shmsegptr->label);
shmsegptr->label = NULL;
}
}
void
mac_sysvshm_create(struct ucred *cred, struct shmid_kernel *shmsegptr)
{
MAC_POLICY_PERFORM_NOSLEEP(sysvshm_create, cred, shmsegptr,
shmsegptr->label);
}
void
mac_sysvshm_cleanup(struct shmid_kernel *shmsegptr)
{
MAC_POLICY_PERFORM_NOSLEEP(sysvshm_cleanup, shmsegptr->label);
}
MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmat, "struct ucred *",
"struct shmid_kernel *", "int");
int
mac_sysvshm_check_shmat(struct ucred *cred, struct shmid_kernel *shmsegptr,
int shmflg)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmat, cred, shmsegptr,
shmsegptr->label, shmflg);
MAC_CHECK_PROBE3(sysvshm_check_shmat, error, cred, shmsegptr,
shmflg);
return (error);
}
MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmctl, "struct ucred *",
"struct shmid_kernel *", "int");
int
mac_sysvshm_check_shmctl(struct ucred *cred, struct shmid_kernel *shmsegptr,
int cmd)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmctl, cred, shmsegptr,
shmsegptr->label, cmd);
MAC_CHECK_PROBE3(sysvshm_check_shmctl, error, cred, shmsegptr, cmd);
return (error);
}
MAC_CHECK_PROBE_DEFINE2(sysvshm_check_shmdt, "struct ucred *",
"struct shmid *");
int
mac_sysvshm_check_shmdt(struct ucred *cred, struct shmid_kernel *shmsegptr)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmdt, cred, shmsegptr,
shmsegptr->label);
MAC_CHECK_PROBE2(sysvshm_check_shmdt, error, cred, shmsegptr);
return (error);
}
MAC_CHECK_PROBE_DEFINE3(sysvshm_check_shmget, "struct ucred *",
"struct shmid_kernel *", "int");
int
mac_sysvshm_check_shmget(struct ucred *cred, struct shmid_kernel *shmsegptr,
int shmflg)
{
int error;
MAC_POLICY_CHECK_NOSLEEP(sysvshm_check_shmget, cred, shmsegptr,
shmsegptr->label, shmflg);
MAC_CHECK_PROBE3(sysvshm_check_shmget, error, cred, shmsegptr,
shmflg);
return (error);
}