420 lines
13 KiB
C
420 lines
13 KiB
C
/*
|
|
* Copyright (c) 2000-2010 Apple Inc. All rights reserved.
|
|
*
|
|
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
|
|
*
|
|
* This file contains Original Code and/or Modifications of Original Code
|
|
* as defined in and that are subject to the Apple Public Source License
|
|
* Version 2.0 (the 'License'). You may not use this file except in
|
|
* compliance with the License. The rights granted to you under the License
|
|
* may not be used to create, or enable the creation or redistribution of,
|
|
* unlawful or unlicensed copies of an Apple operating system, or to
|
|
* circumvent, violate, or enable the circumvention or violation of, any
|
|
* terms of an Apple operating system software license agreement.
|
|
*
|
|
* Please obtain a copy of the License at
|
|
* http://www.opensource.apple.com/apsl/ and read it before using this file.
|
|
*
|
|
* The Original Code and all software distributed under the License are
|
|
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
|
|
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
|
|
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
|
|
* Please see the License for the specific language governing rights and
|
|
* limitations under the License.
|
|
*
|
|
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
|
|
*/
|
|
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
|
|
/*-
|
|
* Copyright (c) 1982, 1986, 1989, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
|
|
*/
|
|
/* HISTORY
|
|
* 08-May-95 Mac Gillon (mgillon) at NeXT
|
|
* Purged old history
|
|
* New version based on 4.4
|
|
*/
|
|
/*
|
|
* NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
|
|
* support for mandatory and extensible security protections. This notice
|
|
* is included in support of clause 2.2 (b) of the Apple Public License,
|
|
* Version 2.0.
|
|
*/
|
|
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/proc_internal.h>
|
|
#include <sys/kauth.h>
|
|
#include <sys/mount_internal.h>
|
|
#include <sys/vnode_internal.h>
|
|
#include <sys/file_internal.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/acct.h>
|
|
#include <sys/resourcevar.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/tty.h>
|
|
#include <sys/sysproto.h>
|
|
#if CONFIG_MACF
|
|
#include <security/mac_framework.h>
|
|
#endif
|
|
|
|
/*
|
|
* The routines implemented in this file are described in:
|
|
* Leffler, et al.: The Design and Implementation of the 4.3BSD
|
|
* UNIX Operating System (Addison Welley, 1989)
|
|
* on pages 62-63.
|
|
*
|
|
* Arguably, to simplify accounting operations, this mechanism should
|
|
* be replaced by one in which an accounting log file (similar to /dev/klog)
|
|
* is read by a user process, etc. However, that has its own problems.
|
|
*/
|
|
|
|
/*
|
|
* Internal accounting functions.
|
|
* The former's operation is described in Leffler, et al., and the latter
|
|
* was provided by UCB with the 4.4BSD-Lite release
|
|
*/
|
|
comp_t encode_comp_t(uint32_t, uint32_t);
|
|
void acctwatch(void *);
|
|
|
|
/*
|
|
* Accounting vnode pointer, and suspended accounting vnode pointer. States
|
|
* are as follows:
|
|
*
|
|
* acctp suspend_acctp state
|
|
* ------------- ------------ ------------------------------
|
|
* NULL NULL Accounting disabled
|
|
* !NULL NULL Accounting enabled
|
|
* NULL !NULL Accounting enabled, but suspended
|
|
* !NULL !NULL <not allowed>
|
|
*/
|
|
struct vnode *acctp;
|
|
struct vnode *suspend_acctp;
|
|
|
|
/*
|
|
* Values associated with enabling and disabling accounting
|
|
*/
|
|
int acctsuspend = 2; /* stop accounting when < 2% free space left */
|
|
int acctresume = 4; /* resume when free space risen to > 4% */
|
|
int acctchkfreq = 15; /* frequency (in seconds) to check space */
|
|
|
|
|
|
static LCK_GRP_DECLARE(acct_subsys_lck_grp, "acct");
|
|
static LCK_MTX_DECLARE(acct_subsys_mutex, &acct_subsys_lck_grp);
|
|
|
|
#define ACCT_SUBSYS_LOCK() lck_mtx_lock(&acct_subsys_mutex)
|
|
#define ACCT_SUBSYS_UNLOCK() lck_mtx_unlock(&acct_subsys_mutex)
|
|
|
|
|
|
/*
|
|
* Accounting system call. Written based on the specification and
|
|
* previous implementation done by Mark Tinguely.
|
|
*/
|
|
int
|
|
acct(proc_t p, struct acct_args *uap, __unused int *retval)
|
|
{
|
|
struct nameidata nd;
|
|
int error;
|
|
struct vfs_context *ctx;
|
|
|
|
ctx = vfs_context_current();
|
|
|
|
/* Make sure that the caller is root. */
|
|
if ((error = suser(vfs_context_ucred(ctx), &p->p_acflag))) {
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* If accounting is to be started to a file, open that file for
|
|
* writing and make sure it's a 'normal'.
|
|
*/
|
|
if (uap->path != USER_ADDR_NULL) {
|
|
NDINIT(&nd, LOOKUP, OP_OPEN, NOFOLLOW, UIO_USERSPACE, uap->path, ctx);
|
|
if ((error = vn_open(&nd, FWRITE, 0))) {
|
|
return error;
|
|
}
|
|
#if CONFIG_MACF
|
|
error = mac_system_check_acct(vfs_context_ucred(ctx), nd.ni_vp);
|
|
if (error) {
|
|
vnode_put(nd.ni_vp);
|
|
vn_close(nd.ni_vp, FWRITE, ctx);
|
|
return error;
|
|
}
|
|
#endif
|
|
vnode_put(nd.ni_vp);
|
|
|
|
if (nd.ni_vp->v_type != VREG) {
|
|
vn_close(nd.ni_vp, FWRITE, ctx);
|
|
return EACCES;
|
|
}
|
|
}
|
|
#if CONFIG_MACF
|
|
else {
|
|
error = mac_system_check_acct(vfs_context_ucred(ctx), NULL);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* If accounting was previously enabled, kill the old space-watcher,
|
|
* close the file, and (if no new file was specified, leave).
|
|
*/
|
|
ACCT_SUBSYS_LOCK();
|
|
if (acctp != NULLVP || suspend_acctp != NULLVP) {
|
|
untimeout(acctwatch, NULL);
|
|
error = vn_close((acctp != NULLVP ? acctp : suspend_acctp),
|
|
FWRITE, vfs_context_current());
|
|
|
|
acctp = suspend_acctp = NULLVP;
|
|
}
|
|
if (uap->path == USER_ADDR_NULL) {
|
|
ACCT_SUBSYS_UNLOCK();
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Save the new accounting file vnode, and schedule the new
|
|
* free space watcher.
|
|
*/
|
|
acctp = nd.ni_vp;
|
|
ACCT_SUBSYS_UNLOCK();
|
|
|
|
acctwatch(NULL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Write out process accounting information, on process exit.
|
|
* Data to be written out is specified in Leffler, et al.
|
|
* and are enumerated below. (They're also noted in the system
|
|
* "acct.h" header file.)
|
|
*/
|
|
int
|
|
acct_process(proc_t p)
|
|
{
|
|
struct acct an_acct;
|
|
struct rusage rup, *r;
|
|
struct timeval ut, st, tmp;
|
|
int t;
|
|
int error;
|
|
struct vnode *vp;
|
|
kauth_cred_t safecred;
|
|
struct pgrp *pg;
|
|
|
|
/* If accounting isn't enabled, don't bother */
|
|
ACCT_SUBSYS_LOCK();
|
|
vp = acctp;
|
|
if (vp == NULLVP) {
|
|
ACCT_SUBSYS_UNLOCK();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Get process accounting information.
|
|
*/
|
|
|
|
/* (1) The name of the command that ran */
|
|
bcopy(p->p_comm, an_acct.ac_comm, sizeof an_acct.ac_comm);
|
|
|
|
/* (2) The amount of user and system time that was used */
|
|
calcru(p, &ut, &st, NULL);
|
|
an_acct.ac_utime = encode_comp_t((uint32_t)ut.tv_sec, ut.tv_usec);
|
|
an_acct.ac_stime = encode_comp_t((uint32_t)st.tv_sec, st.tv_usec);
|
|
|
|
/* (3) The elapsed time the commmand ran (and its starting time) */
|
|
an_acct.ac_btime = (u_int32_t)p->p_start.tv_sec;
|
|
microtime(&tmp);
|
|
timevalsub(&tmp, &p->p_start);
|
|
an_acct.ac_etime = encode_comp_t((uint32_t)tmp.tv_sec, tmp.tv_usec);
|
|
|
|
/* (4) The average amount of memory used */
|
|
proc_lock(p);
|
|
rup = p->p_stats->p_ru;
|
|
proc_unlock(p);
|
|
r = &rup;
|
|
tmp = ut;
|
|
timevaladd(&tmp, &st);
|
|
t = (int)(tmp.tv_sec * hz + tmp.tv_usec / tick);
|
|
if (t) {
|
|
an_acct.ac_mem = (u_int16_t)((r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t);
|
|
} else {
|
|
an_acct.ac_mem = 0;
|
|
}
|
|
|
|
/* (5) The number of disk I/O operations done */
|
|
an_acct.ac_io = encode_comp_t((uint32_t)(r->ru_inblock + r->ru_oublock), 0);
|
|
|
|
/* (6) The UID and GID of the process */
|
|
safecred = kauth_cred_proc_ref(p);
|
|
|
|
an_acct.ac_uid = kauth_cred_getruid(safecred);
|
|
an_acct.ac_gid = kauth_cred_getrgid(safecred);
|
|
|
|
/* (7) The terminal from which the process was started */
|
|
|
|
an_acct.ac_tty = NODEV;
|
|
if ((p->p_flag & P_CONTROLT) && (pg = proc_pgrp(p, NULL))) {
|
|
an_acct.ac_tty = os_atomic_load(&pg->pg_session->s_ttydev, relaxed);
|
|
pgrp_rele(pg);
|
|
}
|
|
|
|
/* (8) The boolean flags that tell how the process terminated, etc. */
|
|
an_acct.ac_flag = (u_int8_t)p->p_acflag;
|
|
|
|
/*
|
|
* Now, just write the accounting information to the file.
|
|
*/
|
|
if ((error = vnode_getwithref(vp)) == 0) {
|
|
error = vn_rdwr(UIO_WRITE, vp, (caddr_t)&an_acct, sizeof(an_acct),
|
|
(off_t)0, UIO_SYSSPACE, IO_APPEND | IO_UNIT, safecred,
|
|
(int *)0, p);
|
|
vnode_put(vp);
|
|
}
|
|
|
|
kauth_cred_unref(&safecred);
|
|
ACCT_SUBSYS_UNLOCK();
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Encode_comp_t converts from ticks in seconds and microseconds
|
|
* to ticks in 1/AHZ seconds. The encoding is described in
|
|
* Leffler, et al., on page 63.
|
|
*/
|
|
|
|
#define MANTSIZE 13 /* 13 bit mantissa. */
|
|
#define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
|
|
#define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
|
|
|
|
comp_t
|
|
encode_comp_t(uint32_t s, uint32_t us)
|
|
{
|
|
int exp, rnd;
|
|
|
|
exp = 0;
|
|
rnd = 0;
|
|
s *= AHZ;
|
|
s += us / (1000000 / AHZ); /* Maximize precision. */
|
|
|
|
while (s > MAXFRACT) {
|
|
rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
|
|
s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
|
|
exp++;
|
|
}
|
|
|
|
/* If we need to round up, do it (and handle overflow correctly). */
|
|
if (rnd && (++s > MAXFRACT)) {
|
|
s >>= EXPSIZE;
|
|
exp++;
|
|
}
|
|
|
|
/* Clean it up and polish it off. */
|
|
exp <<= MANTSIZE; /* Shift the exponent into place */
|
|
exp += s; /* and add on the mantissa. */
|
|
return (comp_t)exp;
|
|
}
|
|
|
|
/*
|
|
* Periodically check the file system to see if accounting
|
|
* should be turned on or off. Beware the case where the vnode
|
|
* has been vgone()'d out from underneath us, e.g. when the file
|
|
* system containing the accounting file has been forcibly unmounted.
|
|
*/
|
|
/* ARGSUSED */
|
|
void
|
|
acctwatch(__unused void *a)
|
|
{
|
|
vfs_context_t ctx = vfs_context_current();
|
|
struct vfs_attr va;
|
|
|
|
VFSATTR_INIT(&va);
|
|
VFSATTR_WANTED(&va, f_blocks);
|
|
VFSATTR_WANTED(&va, f_bavail);
|
|
|
|
ACCT_SUBSYS_LOCK();
|
|
if (suspend_acctp != NULLVP) {
|
|
/*
|
|
* Resuming accounting when accounting is suspended, and the
|
|
* filesystem containing the suspended accounting file goes
|
|
* below a low watermark
|
|
*/
|
|
if (suspend_acctp->v_type == VBAD) {
|
|
(void) vn_close(suspend_acctp, FWRITE, vfs_context_kernel());
|
|
suspend_acctp = NULLVP;
|
|
ACCT_SUBSYS_UNLOCK();
|
|
return;
|
|
}
|
|
(void)vfs_getattr(suspend_acctp->v_mount, &va, ctx);
|
|
if (va.f_bavail > acctresume * va.f_blocks / 100) {
|
|
acctp = suspend_acctp;
|
|
suspend_acctp = NULLVP;
|
|
log(LOG_NOTICE, "Accounting resumed\n");
|
|
}
|
|
} else if (acctp != NULLVP) {
|
|
/*
|
|
* Suspending accounting when accounting is currently active,
|
|
* and the filesystem containing the active accounting file
|
|
* goes over a high watermark
|
|
*/
|
|
if (acctp->v_type == VBAD) {
|
|
(void) vn_close(acctp, FWRITE, vfs_context_kernel());
|
|
acctp = NULLVP;
|
|
ACCT_SUBSYS_UNLOCK();
|
|
return;
|
|
}
|
|
(void)vfs_getattr(acctp->v_mount, &va, ctx);
|
|
if (va.f_bavail <= acctsuspend * va.f_blocks / 100) {
|
|
suspend_acctp = acctp;
|
|
acctp = NULLVP;
|
|
log(LOG_NOTICE, "Accounting suspended\n");
|
|
}
|
|
} else {
|
|
ACCT_SUBSYS_UNLOCK();
|
|
return;
|
|
}
|
|
ACCT_SUBSYS_UNLOCK();
|
|
|
|
timeout(acctwatch, NULL, acctchkfreq * hz);
|
|
}
|