audit_worker.c revision 176627
1156888Srwatson/* 2156888Srwatson * Copyright (c) 1999-2005 Apple Computer, Inc. 3176627Srwatson * Copyright (c) 2006-2008 Robert N. M. Watson 4156888Srwatson * All rights reserved. 5156888Srwatson * 6156888Srwatson * Redistribution and use in source and binary forms, with or without 7156888Srwatson * modification, are permitted provided that the following conditions 8156888Srwatson * are met: 9156888Srwatson * 1. Redistributions of source code must retain the above copyright 10156888Srwatson * notice, this list of conditions and the following disclaimer. 11156888Srwatson * 2. Redistributions in binary form must reproduce the above copyright 12156888Srwatson * notice, this list of conditions and the following disclaimer in the 13156888Srwatson * documentation and/or other materials provided with the distribution. 14156888Srwatson * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 15156888Srwatson * its contributors may be used to endorse or promote products derived 16156888Srwatson * from this software without specific prior written permission. 17156888Srwatson * 18156888Srwatson * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND 19156888Srwatson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20156888Srwatson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21156888Srwatson * ARE DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR 22156888Srwatson * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23156888Srwatson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24156888Srwatson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25156888Srwatson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26156888Srwatson * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27156888Srwatson * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28156888Srwatson * POSSIBILITY OF SUCH DAMAGE. 29156888Srwatson * 30156888Srwatson * $FreeBSD: head/sys/security/audit/audit_worker.c 176627 2008-02-27 17:12:22Z rwatson $ 31156888Srwatson */ 32156888Srwatson 33156888Srwatson#include <sys/param.h> 34156888Srwatson#include <sys/condvar.h> 35156888Srwatson#include <sys/conf.h> 36156888Srwatson#include <sys/file.h> 37156888Srwatson#include <sys/filedesc.h> 38156888Srwatson#include <sys/fcntl.h> 39156888Srwatson#include <sys/ipc.h> 40156888Srwatson#include <sys/kernel.h> 41156888Srwatson#include <sys/kthread.h> 42156888Srwatson#include <sys/malloc.h> 43156888Srwatson#include <sys/mount.h> 44156888Srwatson#include <sys/namei.h> 45156888Srwatson#include <sys/proc.h> 46156888Srwatson#include <sys/queue.h> 47156888Srwatson#include <sys/socket.h> 48156888Srwatson#include <sys/socketvar.h> 49156888Srwatson#include <sys/protosw.h> 50156888Srwatson#include <sys/domain.h> 51176627Srwatson#include <sys/sx.h> 52156888Srwatson#include <sys/sysproto.h> 53156888Srwatson#include <sys/sysent.h> 54156888Srwatson#include <sys/systm.h> 55156888Srwatson#include <sys/ucred.h> 56156888Srwatson#include <sys/uio.h> 57156888Srwatson#include <sys/un.h> 58156888Srwatson#include <sys/unistd.h> 59156888Srwatson#include <sys/vnode.h> 60156888Srwatson 61156888Srwatson#include <bsm/audit.h> 62156888Srwatson#include <bsm/audit_internal.h> 63156888Srwatson#include <bsm/audit_kevents.h> 64156888Srwatson 65156888Srwatson#include <netinet/in.h> 66156888Srwatson#include <netinet/in_pcb.h> 67156888Srwatson 68156888Srwatson#include <security/audit/audit.h> 69156888Srwatson#include <security/audit/audit_private.h> 70156888Srwatson 71156888Srwatson#include <vm/uma.h> 72156888Srwatson 73156888Srwatson/* 74156888Srwatson * Worker thread that will schedule disk I/O, etc. 75156889Srwatson */ 76156888Srwatsonstatic struct proc *audit_thread; 77156888Srwatson 78156888Srwatson/* 79176627Srwatson * audit_cred and audit_vp are the stored credential and vnode to use for 80176627Srwatson * active audit trail. They are protected by audit_worker_sx, which will be 81176627Srwatson * held across all I/O and all rotation to prevent them from being replaced 82176627Srwatson * (rotated) while in use. The audit_file_rotate_wait flag is set when the 83176627Srwatson * kernel has delivered a trigger to auditd to rotate the trail, and is 84176627Srwatson * cleared when the next rotation takes place. It is also protected by 85176627Srwatson * audit_worker_sx. 86156888Srwatson */ 87176627Srwatsonstatic int audit_file_rotate_wait; 88176627Srwatsonstatic struct sx audit_worker_sx; 89176627Srwatsonstatic struct ucred *audit_cred; 90176627Srwatsonstatic struct vnode *audit_vp; 91156888Srwatson 92156888Srwatson/* 93162599Srwatson * Write an audit record to a file, performed as the last stage after both 94162599Srwatson * preselection and BSM conversion. Both space management and write failures 95162599Srwatson * are handled in this function. 96162599Srwatson * 97162599Srwatson * No attempt is made to deal with possible failure to deliver a trigger to 98162599Srwatson * the audit daemon, since the message is asynchronous anyway. 99156888Srwatson */ 100162599Srwatsonstatic void 101176627Srwatsonaudit_record_write(struct vnode *vp, struct ucred *cred, void *data, 102176627Srwatson size_t len) 103156888Srwatson{ 104162599Srwatson static struct timeval last_lowspace_trigger; 105162599Srwatson static struct timeval last_fail; 106162599Srwatson static int cur_lowspace_trigger; 107162599Srwatson struct statfs *mnt_stat; 108162599Srwatson int error, vfslocked; 109162599Srwatson static int cur_fail; 110162599Srwatson struct vattr vattr; 111156888Srwatson long temp; 112156888Srwatson 113176627Srwatson sx_assert(&audit_worker_sx, SA_LOCKED); /* audit_file_rotate_wait. */ 114176627Srwatson 115159264Srwatson if (vp == NULL) 116162599Srwatson return; 117159264Srwatson 118159332Srwatson mnt_stat = &vp->v_mount->mnt_stat; 119156888Srwatson vfslocked = VFS_LOCK_GIANT(vp->v_mount); 120156888Srwatson 121156888Srwatson /* 122156889Srwatson * First, gather statistics on the audit log file and file system so 123162599Srwatson * that we know how we're doing on space. Consider failure of these 124162599Srwatson * operations to indicate a future inability to write to the file. 125156888Srwatson */ 126176627Srwatson error = VFS_STATFS(vp->v_mount, mnt_stat, curthread); 127162599Srwatson if (error) 128162599Srwatson goto fail; 129175202Sattilio vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 130176627Srwatson error = VOP_GETATTR(vp, &vattr, cred, curthread); 131175294Sattilio VOP_UNLOCK(vp, 0); 132162599Srwatson if (error) 133162599Srwatson goto fail; 134156889Srwatson audit_fstat.af_currsz = vattr.va_size; 135156888Srwatson 136156888Srwatson /* 137162599Srwatson * We handle four different space-related limits: 138162599Srwatson * 139162599Srwatson * - A fixed (hard) limit on the minimum free blocks we require on 140162599Srwatson * the file system, and results in record loss, a trigger, and 141162599Srwatson * possible fail stop due to violating invariants. 142162599Srwatson * 143162599Srwatson * - An administrative (soft) limit, which when fallen below, results 144162599Srwatson * in the kernel notifying the audit daemon of low space. 145162599Srwatson * 146162599Srwatson * - An audit trail size limit, which when gone above, results in the 147162599Srwatson * kernel notifying the audit daemon that rotation is desired. 148162599Srwatson * 149162599Srwatson * - The total depth of the kernel audit record exceeding free space, 150162599Srwatson * which can lead to possible fail stop (with drain), in order to 151162599Srwatson * prevent violating invariants. Failure here doesn't halt 152162599Srwatson * immediately, but prevents new records from being generated. 153162599Srwatson * 154162599Srwatson * Possibly, the last of these should be handled differently, always 155162599Srwatson * allowing a full queue to be lost, rather than trying to prevent 156162599Srwatson * loss. 157162599Srwatson * 158162599Srwatson * First, handle the hard limit, which generates a trigger and may 159162599Srwatson * fail stop. This is handled in the same manner as ENOSPC from 160162599Srwatson * VOP_WRITE, and results in record loss. 161156888Srwatson */ 162162599Srwatson if (mnt_stat->f_bfree < AUDIT_HARD_LIMIT_FREE_BLOCKS) { 163162599Srwatson error = ENOSPC; 164162599Srwatson goto fail_enospc; 165162599Srwatson } 166156888Srwatson 167156889Srwatson /* 168162599Srwatson * Second, handle falling below the soft limit, if defined; we send 169162599Srwatson * the daemon a trigger and continue processing the record. Triggers 170162599Srwatson * are limited to 1/sec. 171156888Srwatson */ 172162599Srwatson if (audit_qctrl.aq_minfree != 0) { 173156889Srwatson /* 174162599Srwatson * XXXAUDIT: Check math and block size calculations here. 175156888Srwatson */ 176162599Srwatson temp = mnt_stat->f_blocks / (100 / audit_qctrl.aq_minfree); 177162599Srwatson if (mnt_stat->f_bfree < temp) { 178162599Srwatson if (ppsratecheck(&last_lowspace_trigger, 179162599Srwatson &cur_lowspace_trigger, 1)) { 180156888Srwatson (void)send_trigger(AUDIT_TRIGGER_LOW_SPACE); 181162599Srwatson printf("Warning: audit space low\n"); 182162599Srwatson } 183156888Srwatson } 184162599Srwatson } 185156888Srwatson 186156889Srwatson /* 187162599Srwatson * If the current file is getting full, generate a rotation trigger 188162599Srwatson * to the daemon. This is only approximate, which is fine as more 189162599Srwatson * records may be generated before the daemon rotates the file. 190156888Srwatson */ 191162599Srwatson if ((audit_fstat.af_filesz != 0) && (audit_file_rotate_wait == 0) && 192156888Srwatson (vattr.va_size >= audit_fstat.af_filesz)) { 193176627Srwatson sx_assert(&audit_worker_sx, SA_XLOCKED); 194176627Srwatson 195156888Srwatson audit_file_rotate_wait = 1; 196162508Srwatson (void)send_trigger(AUDIT_TRIGGER_ROTATE_KERNEL); 197156888Srwatson } 198156888Srwatson 199156888Srwatson /* 200156888Srwatson * If the estimated amount of audit data in the audit event queue 201156889Srwatson * (plus records allocated but not yet queued) has reached the amount 202156889Srwatson * of free space on the disk, then we need to go into an audit fail 203156889Srwatson * stop state, in which we do not permit the allocation/committing of 204162599Srwatson * any new audit records. We continue to process records but don't 205156889Srwatson * allow any activities that might generate new records. In the 206156889Srwatson * future, we might want to detect when space is available again and 207156889Srwatson * allow operation to continue, but this behavior is sufficient to 208156889Srwatson * meet fail stop requirements in CAPP. 209156888Srwatson */ 210162599Srwatson if (audit_fail_stop) { 211162599Srwatson if ((unsigned long)((audit_q_len + audit_pre_q_len + 1) * 212162599Srwatson MAX_AUDIT_RECORD_SIZE) / mnt_stat->f_bsize >= 213162599Srwatson (unsigned long)(mnt_stat->f_bfree)) { 214162599Srwatson if (ppsratecheck(&last_fail, &cur_fail, 1)) 215162599Srwatson printf("audit_record_write: free space " 216162599Srwatson "below size of audit queue, failing " 217162599Srwatson "stop\n"); 218162599Srwatson audit_in_failure = 1; 219162599Srwatson } else if (audit_in_failure) { 220162599Srwatson /* 221165604Srwatson * Note: if we want to handle recovery, this is the 222162599Srwatson * spot to do it: unset audit_in_failure, and issue a 223162599Srwatson * wakeup on the cv. 224162599Srwatson */ 225162599Srwatson } 226156888Srwatson } 227156888Srwatson 228162599Srwatson error = vn_rdwr(UIO_WRITE, vp, data, len, (off_t)0, UIO_SYSSPACE, 229176627Srwatson IO_APPEND|IO_UNIT, cred, NULL, NULL, curthread); 230162599Srwatson if (error == ENOSPC) 231162599Srwatson goto fail_enospc; 232162599Srwatson else if (error) 233162599Srwatson goto fail; 234156888Srwatson 235156888Srwatson /* 236162599Srwatson * Catch completion of a queue drain here; if we're draining and the 237162599Srwatson * queue is now empty, fail stop. That audit_fail_stop is implicitly 238162599Srwatson * true, since audit_in_failure can only be set of audit_fail_stop is 239162599Srwatson * set. 240162599Srwatson * 241165604Srwatson * Note: if we handle recovery from audit_in_failure, then we need to 242165604Srwatson * make panic here conditional. 243156888Srwatson */ 244162599Srwatson if (audit_in_failure) { 245162599Srwatson if (audit_q_len == 0 && audit_pre_q_len == 0) { 246175294Sattilio VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK); 247176627Srwatson (void)VOP_FSYNC(vp, MNT_WAIT, curthread); 248175294Sattilio VOP_UNLOCK(vp, 0); 249162599Srwatson panic("Audit store overflow; record queue drained."); 250162599Srwatson } 251162599Srwatson } 252162599Srwatson 253162599Srwatson VFS_UNLOCK_GIANT(vfslocked); 254162599Srwatson return; 255162599Srwatson 256162599Srwatsonfail_enospc: 257162599Srwatson /* 258162599Srwatson * ENOSPC is considered a special case with respect to failures, as 259162599Srwatson * this can reflect either our preemptive detection of insufficient 260162599Srwatson * space, or ENOSPC returned by the vnode write call. 261162599Srwatson */ 262162599Srwatson if (audit_fail_stop) { 263175294Sattilio VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK); 264176627Srwatson (void)VOP_FSYNC(vp, MNT_WAIT, curthread); 265175294Sattilio VOP_UNLOCK(vp, 0); 266162599Srwatson panic("Audit log space exhausted and fail-stop set."); 267156888Srwatson } 268162599Srwatson (void)send_trigger(AUDIT_TRIGGER_NO_SPACE); 269162599Srwatson audit_suspended = 1; 270156888Srwatson 271162599Srwatson /* FALLTHROUGH */ 272162599Srwatsonfail: 273162599Srwatson /* 274162599Srwatson * We have failed to write to the file, so the current record is 275162599Srwatson * lost, which may require an immediate system halt. 276162599Srwatson */ 277162599Srwatson if (audit_panic_on_write_fail) { 278175294Sattilio VOP_LOCK(vp, LK_DRAIN | LK_INTERLOCK); 279176627Srwatson (void)VOP_FSYNC(vp, MNT_WAIT, curthread); 280175294Sattilio VOP_UNLOCK(vp, 0); 281162599Srwatson panic("audit_worker: write error %d\n", error); 282162599Srwatson } else if (ppsratecheck(&last_fail, &cur_fail, 1)) 283162599Srwatson printf("audit_worker: write error %d\n", error); 284156888Srwatson VFS_UNLOCK_GIANT(vfslocked); 285156888Srwatson} 286156888Srwatson 287156888Srwatson/* 288159264Srwatson * Given a kernel audit record, process as required. Kernel audit records 289159264Srwatson * are converted to one, or possibly two, BSM records, depending on whether 290159264Srwatson * there is a user audit record present also. Kernel records need be 291159264Srwatson * converted to BSM before they can be written out. Both types will be 292159264Srwatson * written to disk, and audit pipes. 293159263Srwatson */ 294159263Srwatsonstatic void 295176627Srwatsonaudit_worker_process_record(struct kaudit_record *ar) 296159263Srwatson{ 297159264Srwatson struct au_record *bsm; 298159269Srwatson au_class_t class; 299159269Srwatson au_event_t event; 300159269Srwatson au_id_t auid; 301162599Srwatson int error, sorf; 302176627Srwatson int trail_locked; 303159263Srwatson 304162599Srwatson /* 305176627Srwatson * We hold the audit_worker_sx lock over both writes, if there are 306176627Srwatson * two, so that the two records won't be split across a rotation and 307176627Srwatson * end up in two different trail files. 308176627Srwatson */ 309176627Srwatson if (((ar->k_ar_commit & AR_COMMIT_USER) && 310176627Srwatson (ar->k_ar_commit & AR_PRESELECT_USER_TRAIL)) || 311176627Srwatson (ar->k_ar_commit & AR_PRESELECT_TRAIL)) { 312176627Srwatson sx_xlock(&audit_worker_sx); 313176627Srwatson trail_locked = 1; 314176627Srwatson } else 315176627Srwatson trail_locked = 0; 316176627Srwatson 317176627Srwatson /* 318162599Srwatson * First, handle the user record, if any: commit to the system trail 319162599Srwatson * and audit pipes as selected. 320162599Srwatson */ 321159269Srwatson if ((ar->k_ar_commit & AR_COMMIT_USER) && 322176627Srwatson (ar->k_ar_commit & AR_PRESELECT_USER_TRAIL)) { 323176627Srwatson sx_assert(&audit_worker_sx, SA_XLOCKED); 324176627Srwatson audit_record_write(audit_vp, audit_cred, ar->k_udata, 325176627Srwatson ar->k_ulen); 326176627Srwatson } 327162380Scsjp 328159269Srwatson if ((ar->k_ar_commit & AR_COMMIT_USER) && 329162380Scsjp (ar->k_ar_commit & AR_PRESELECT_USER_PIPE)) 330159269Srwatson audit_pipe_submit_user(ar->k_udata, ar->k_ulen); 331159264Srwatson 332162380Scsjp if (!(ar->k_ar_commit & AR_COMMIT_KERNEL) || 333162380Scsjp ((ar->k_ar_commit & AR_PRESELECT_PIPE) == 0 && 334162380Scsjp (ar->k_ar_commit & AR_PRESELECT_TRAIL) == 0)) 335176627Srwatson goto out; 336159264Srwatson 337159269Srwatson auid = ar->k_ar.ar_subj_auid; 338159269Srwatson event = ar->k_ar.ar_event; 339159269Srwatson class = au_event_class(event); 340159269Srwatson if (ar->k_ar.ar_errno == 0) 341159269Srwatson sorf = AU_PRS_SUCCESS; 342159269Srwatson else 343159269Srwatson sorf = AU_PRS_FAILURE; 344159264Srwatson 345162599Srwatson error = kaudit_to_bsm(ar, &bsm); 346162599Srwatson switch (error) { 347159269Srwatson case BSM_NOAUDIT: 348176627Srwatson goto out; 349159264Srwatson 350159269Srwatson case BSM_FAILURE: 351159269Srwatson printf("audit_worker_process_record: BSM_FAILURE\n"); 352176627Srwatson goto out; 353159269Srwatson 354159269Srwatson case BSM_SUCCESS: 355159269Srwatson break; 356159269Srwatson 357159269Srwatson default: 358162599Srwatson panic("kaudit_to_bsm returned %d", error); 359159264Srwatson } 360159269Srwatson 361176627Srwatson if (ar->k_ar_commit & AR_PRESELECT_TRAIL) { 362176627Srwatson sx_assert(&audit_worker_sx, SA_XLOCKED); 363176627Srwatson audit_record_write(audit_vp, audit_cred, bsm->data, bsm->len); 364176627Srwatson } 365162380Scsjp 366159269Srwatson if (ar->k_ar_commit & AR_PRESELECT_PIPE) 367159269Srwatson audit_pipe_submit(auid, event, class, sorf, 368159269Srwatson ar->k_ar_commit & AR_PRESELECT_TRAIL, bsm->data, 369159269Srwatson bsm->len); 370162599Srwatson 371159269Srwatson kau_free(bsm); 372176627Srwatsonout: 373176627Srwatson if (trail_locked) 374176627Srwatson sx_xunlock(&audit_worker_sx); 375159263Srwatson} 376159263Srwatson 377159263Srwatson/* 378156888Srwatson * The audit_worker thread is responsible for watching the event queue, 379156888Srwatson * dequeueing records, converting them to BSM format, and committing them to 380156888Srwatson * disk. In order to minimize lock thrashing, records are dequeued in sets 381176627Srwatson * to a thread-local work queue. 382176627Srwatson * 383176627Srwatson * Note: this means that the effect bound on the size of the pending record 384176627Srwatson * queue is 2x the length of the global queue. 385156888Srwatson */ 386156888Srwatsonstatic void 387156888Srwatsonaudit_worker(void *arg) 388156888Srwatson{ 389159262Srwatson struct kaudit_queue ar_worklist; 390156888Srwatson struct kaudit_record *ar; 391159263Srwatson int lowater_signal; 392156888Srwatson 393156888Srwatson TAILQ_INIT(&ar_worklist); 394156888Srwatson mtx_lock(&audit_mtx); 395156888Srwatson while (1) { 396156888Srwatson mtx_assert(&audit_mtx, MA_OWNED); 397156888Srwatson 398156888Srwatson /* 399176627Srwatson * Wait for a record. 400156888Srwatson */ 401176627Srwatson while (TAILQ_EMPTY(&audit_q)) 402159261Srwatson cv_wait(&audit_worker_cv, &audit_mtx); 403156888Srwatson 404156888Srwatson /* 405159265Srwatson * If there are records in the global audit record queue, 406159265Srwatson * transfer them to a thread-local queue and process them 407159265Srwatson * one by one. If we cross the low watermark threshold, 408159265Srwatson * signal any waiting processes that they may wake up and 409159265Srwatson * continue generating records. 410156888Srwatson */ 411156888Srwatson lowater_signal = 0; 412156888Srwatson while ((ar = TAILQ_FIRST(&audit_q))) { 413156888Srwatson TAILQ_REMOVE(&audit_q, ar, k_q); 414156888Srwatson audit_q_len--; 415156888Srwatson if (audit_q_len == audit_qctrl.aq_lowater) 416156888Srwatson lowater_signal++; 417156888Srwatson TAILQ_INSERT_TAIL(&ar_worklist, ar, k_q); 418156888Srwatson } 419156888Srwatson if (lowater_signal) 420159261Srwatson cv_broadcast(&audit_watermark_cv); 421156888Srwatson 422156888Srwatson mtx_unlock(&audit_mtx); 423156888Srwatson while ((ar = TAILQ_FIRST(&ar_worklist))) { 424156888Srwatson TAILQ_REMOVE(&ar_worklist, ar, k_q); 425176627Srwatson audit_worker_process_record(ar); 426156888Srwatson audit_free(ar); 427156888Srwatson } 428156888Srwatson mtx_lock(&audit_mtx); 429156888Srwatson } 430156888Srwatson} 431156888Srwatson 432156888Srwatson/* 433156888Srwatson * audit_rotate_vnode() is called by a user or kernel thread to configure or 434156888Srwatson * de-configure auditing on a vnode. The arguments are the replacement 435176627Srwatson * credential (referenced) and vnode (referenced and opened) to substitute 436176627Srwatson * for the current credential and vnode, if any. If either is set to NULL, 437176627Srwatson * both should be NULL, and this is used to indicate that audit is being 438176627Srwatson * disabled. Any previous cred/vnode will be closed and freed. We re-enable 439176627Srwatson * generating rotation requests to auditd. 440156888Srwatson */ 441156888Srwatsonvoid 442156888Srwatsonaudit_rotate_vnode(struct ucred *cred, struct vnode *vp) 443156888Srwatson{ 444176627Srwatson struct ucred *old_audit_cred; 445176627Srwatson struct vnode *old_audit_vp; 446176627Srwatson int vfslocked; 447156888Srwatson 448176627Srwatson KASSERT((cred != NULL && vp != NULL) || (cred == NULL && vp == NULL), 449176627Srwatson ("audit_rotate_vnode: cred %p vp %p", cred, vp)); 450156888Srwatson 451156888Srwatson /* 452176627Srwatson * Rotate the vnode/cred, and clear the rotate flag so that we will 453176627Srwatson * send a rotate trigger if the new file fills. 454156888Srwatson */ 455176627Srwatson sx_xlock(&audit_worker_sx); 456176627Srwatson old_audit_cred = audit_cred; 457176627Srwatson old_audit_vp = audit_vp; 458176627Srwatson audit_cred = cred; 459176627Srwatson audit_vp = vp; 460176627Srwatson audit_file_rotate_wait = 0; 461176627Srwatson audit_enabled = (audit_vp != NULL); 462176627Srwatson sx_xunlock(&audit_worker_sx); 463156888Srwatson 464156888Srwatson /* 465176627Srwatson * If there was an old vnode/credential, close and free. 466156888Srwatson */ 467176627Srwatson if (old_audit_vp != NULL) { 468176627Srwatson vfslocked = VFS_LOCK_GIANT(old_audit_vp->v_mount); 469176627Srwatson vn_close(old_audit_vp, AUDIT_CLOSE_FLAGS, old_audit_cred, 470176627Srwatson curthread); 471176627Srwatson VFS_UNLOCK_GIANT(vfslocked); 472176627Srwatson crfree(old_audit_cred); 473176627Srwatson } 474156888Srwatson} 475156888Srwatson 476156888Srwatsonvoid 477156888Srwatsonaudit_worker_init(void) 478156888Srwatson{ 479156888Srwatson int error; 480156888Srwatson 481176627Srwatson sx_init(&audit_worker_sx, "audit_worker_sx"); 482172836Sjulian error = kproc_create(audit_worker, NULL, &audit_thread, RFHIGHPID, 483169831Srwatson 0, "audit"); 484156888Srwatson if (error) 485172836Sjulian panic("audit_worker_init: kproc_create returned %d", error); 486156888Srwatson} 487