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