1cfb5f768SJonathan Anderson /*- 2cfb5f768SJonathan Anderson * Copyright (c) 2009 Robert N. M. Watson 3cfb5f768SJonathan Anderson * All rights reserved. 4cfb5f768SJonathan Anderson * 5cfb5f768SJonathan Anderson * This software was developed at the University of Cambridge Computer 6cfb5f768SJonathan Anderson * Laboratory with support from a grant from Google, Inc. 7cfb5f768SJonathan Anderson * 8cfb5f768SJonathan Anderson * Redistribution and use in source and binary forms, with or without 9cfb5f768SJonathan Anderson * modification, are permitted provided that the following conditions 10cfb5f768SJonathan Anderson * are met: 11cfb5f768SJonathan Anderson * 1. Redistributions of source code must retain the above copyright 12cfb5f768SJonathan Anderson * notice, this list of conditions and the following disclaimer. 13cfb5f768SJonathan Anderson * 2. Redistributions in binary form must reproduce the above copyright 14cfb5f768SJonathan Anderson * notice, this list of conditions and the following disclaimer in the 15cfb5f768SJonathan Anderson * documentation and/or other materials provided with the distribution. 16cfb5f768SJonathan Anderson * 17cfb5f768SJonathan Anderson * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18cfb5f768SJonathan Anderson * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19cfb5f768SJonathan Anderson * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20cfb5f768SJonathan Anderson * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21cfb5f768SJonathan Anderson * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22cfb5f768SJonathan Anderson * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23cfb5f768SJonathan Anderson * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24cfb5f768SJonathan Anderson * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25cfb5f768SJonathan Anderson * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26cfb5f768SJonathan Anderson * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27cfb5f768SJonathan Anderson * SUCH DAMAGE. 28cfb5f768SJonathan Anderson */ 29cfb5f768SJonathan Anderson 30cfb5f768SJonathan Anderson /*- 31cfb5f768SJonathan Anderson * FreeBSD process descriptor facility. 32cfb5f768SJonathan Anderson * 33cfb5f768SJonathan Anderson * Some processes are represented by a file descriptor, which will be used in 34cfb5f768SJonathan Anderson * preference to signaling and pids for the purposes of process management, 35cfb5f768SJonathan Anderson * and is, in effect, a form of capability. When a process descriptor is 36cfb5f768SJonathan Anderson * used with a process, it ceases to be visible to certain traditional UNIX 37cfb5f768SJonathan Anderson * process facilities, such as waitpid(2). 38cfb5f768SJonathan Anderson * 39cfb5f768SJonathan Anderson * Some semantics: 40cfb5f768SJonathan Anderson * 41cfb5f768SJonathan Anderson * - At most one process descriptor will exist for any process, although 42cfb5f768SJonathan Anderson * references to that descriptor may be held from many processes (or even 43cfb5f768SJonathan Anderson * be in flight between processes over a local domain socket). 44cfb5f768SJonathan Anderson * - Last close on the process descriptor will terminate the process using 45cfb5f768SJonathan Anderson * SIGKILL and reparent it to init so that there's a process to reap it 46cfb5f768SJonathan Anderson * when it's done exiting. 47cfb5f768SJonathan Anderson * - If the process exits before the descriptor is closed, it will not 48cfb5f768SJonathan Anderson * generate SIGCHLD on termination, or be picked up by waitpid(). 49cfb5f768SJonathan Anderson * - The pdkill(2) system call may be used to deliver a signal to the process 50cfb5f768SJonathan Anderson * using its process descriptor. 51cfb5f768SJonathan Anderson * - The pdwait4(2) system call may be used to block (or not) on a process 52cfb5f768SJonathan Anderson * descriptor to collect termination information. 53cfb5f768SJonathan Anderson * 54cfb5f768SJonathan Anderson * Open questions: 55cfb5f768SJonathan Anderson * 56cfb5f768SJonathan Anderson * - How to handle ptrace(2)? 57cfb5f768SJonathan Anderson * - Will we want to add a pidtoprocdesc(2) system call to allow process 58d7a39436SEd Schouten * descriptors to be created for processes without pdfork(2)? 59cfb5f768SJonathan Anderson */ 60cfb5f768SJonathan Anderson 61cfb5f768SJonathan Anderson #include <sys/cdefs.h> 62cfb5f768SJonathan Anderson __FBSDID("$FreeBSD$"); 63cfb5f768SJonathan Anderson 64cfb5f768SJonathan Anderson #include <sys/param.h> 654a144410SRobert Watson #include <sys/capsicum.h> 66cfb5f768SJonathan Anderson #include <sys/fcntl.h> 67cfb5f768SJonathan Anderson #include <sys/file.h> 68cfb5f768SJonathan Anderson #include <sys/filedesc.h> 69cfb5f768SJonathan Anderson #include <sys/kernel.h> 70cfb5f768SJonathan Anderson #include <sys/lock.h> 71cfb5f768SJonathan Anderson #include <sys/mutex.h> 72cfb5f768SJonathan Anderson #include <sys/poll.h> 73cfb5f768SJonathan Anderson #include <sys/proc.h> 74cfb5f768SJonathan Anderson #include <sys/procdesc.h> 75cfb5f768SJonathan Anderson #include <sys/resourcevar.h> 76cfb5f768SJonathan Anderson #include <sys/stat.h> 77cfb5f768SJonathan Anderson #include <sys/sysproto.h> 78cfb5f768SJonathan Anderson #include <sys/sysctl.h> 79cfb5f768SJonathan Anderson #include <sys/systm.h> 80cfb5f768SJonathan Anderson #include <sys/ucred.h> 819696feebSJohn Baldwin #include <sys/user.h> 82cfb5f768SJonathan Anderson 83cfb5f768SJonathan Anderson #include <security/audit/audit.h> 84cfb5f768SJonathan Anderson 85cfb5f768SJonathan Anderson #include <vm/uma.h> 86cfb5f768SJonathan Anderson 87cfb5f768SJonathan Anderson FEATURE(process_descriptors, "Process Descriptors"); 88cfb5f768SJonathan Anderson 89cfb5f768SJonathan Anderson static uma_zone_t procdesc_zone; 90cfb5f768SJonathan Anderson 91cfb5f768SJonathan Anderson static fo_poll_t procdesc_poll; 92cfb5f768SJonathan Anderson static fo_kqfilter_t procdesc_kqfilter; 93cfb5f768SJonathan Anderson static fo_stat_t procdesc_stat; 94cfb5f768SJonathan Anderson static fo_close_t procdesc_close; 959696feebSJohn Baldwin static fo_fill_kinfo_t procdesc_fill_kinfo; 96cfb5f768SJonathan Anderson 97cfb5f768SJonathan Anderson static struct fileops procdesc_ops = { 982d69d0dcSJohn Baldwin .fo_read = invfo_rdwr, 992d69d0dcSJohn Baldwin .fo_write = invfo_rdwr, 1002d69d0dcSJohn Baldwin .fo_truncate = invfo_truncate, 1012d69d0dcSJohn Baldwin .fo_ioctl = invfo_ioctl, 102cfb5f768SJonathan Anderson .fo_poll = procdesc_poll, 103cfb5f768SJonathan Anderson .fo_kqfilter = procdesc_kqfilter, 104cfb5f768SJonathan Anderson .fo_stat = procdesc_stat, 105cfb5f768SJonathan Anderson .fo_close = procdesc_close, 1062d69d0dcSJohn Baldwin .fo_chmod = invfo_chmod, 1072d69d0dcSJohn Baldwin .fo_chown = invfo_chown, 108b1dd38f4SKonstantin Belousov .fo_sendfile = invfo_sendfile, 1099696feebSJohn Baldwin .fo_fill_kinfo = procdesc_fill_kinfo, 110cfb5f768SJonathan Anderson .fo_flags = DFLAG_PASSABLE, 111cfb5f768SJonathan Anderson }; 112cfb5f768SJonathan Anderson 113cfb5f768SJonathan Anderson /* 114cfb5f768SJonathan Anderson * Initialize with VFS so that process descriptors are available along with 115cfb5f768SJonathan Anderson * other file descriptor types. As long as it runs before init(8) starts, 116cfb5f768SJonathan Anderson * there shouldn't be a problem. 117cfb5f768SJonathan Anderson */ 118cfb5f768SJonathan Anderson static void 119cfb5f768SJonathan Anderson procdesc_init(void *dummy __unused) 120cfb5f768SJonathan Anderson { 121cfb5f768SJonathan Anderson 122cfb5f768SJonathan Anderson procdesc_zone = uma_zcreate("procdesc", sizeof(struct procdesc), 123cfb5f768SJonathan Anderson NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 124cfb5f768SJonathan Anderson if (procdesc_zone == NULL) 125cfb5f768SJonathan Anderson panic("procdesc_init: procdesc_zone not initialized"); 126cfb5f768SJonathan Anderson } 127cfb5f768SJonathan Anderson SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_ANY, procdesc_init, NULL); 128cfb5f768SJonathan Anderson 129cfb5f768SJonathan Anderson /* 130cfb5f768SJonathan Anderson * Return a locked process given a process descriptor, or ESRCH if it has 131cfb5f768SJonathan Anderson * died. 132cfb5f768SJonathan Anderson */ 133cfb5f768SJonathan Anderson int 1347008be5bSPawel Jakub Dawidek procdesc_find(struct thread *td, int fd, cap_rights_t *rightsp, 135cfb5f768SJonathan Anderson struct proc **p) 136cfb5f768SJonathan Anderson { 137cfb5f768SJonathan Anderson struct procdesc *pd; 138cfb5f768SJonathan Anderson struct file *fp; 139cfb5f768SJonathan Anderson int error; 140cfb5f768SJonathan Anderson 1417008be5bSPawel Jakub Dawidek error = fget(td, fd, rightsp, &fp); 142cfb5f768SJonathan Anderson if (error) 143cfb5f768SJonathan Anderson return (error); 144cfb5f768SJonathan Anderson if (fp->f_type != DTYPE_PROCDESC) { 145cfb5f768SJonathan Anderson error = EBADF; 146cfb5f768SJonathan Anderson goto out; 147cfb5f768SJonathan Anderson } 148cfb5f768SJonathan Anderson pd = fp->f_data; 149cfb5f768SJonathan Anderson sx_slock(&proctree_lock); 150cfb5f768SJonathan Anderson if (pd->pd_proc != NULL) { 151cfb5f768SJonathan Anderson *p = pd->pd_proc; 152cfb5f768SJonathan Anderson PROC_LOCK(*p); 153cfb5f768SJonathan Anderson } else 154cfb5f768SJonathan Anderson error = ESRCH; 155cfb5f768SJonathan Anderson sx_sunlock(&proctree_lock); 156cfb5f768SJonathan Anderson out: 157cfb5f768SJonathan Anderson fdrop(fp, td); 158cfb5f768SJonathan Anderson return (error); 159cfb5f768SJonathan Anderson } 160cfb5f768SJonathan Anderson 161cfb5f768SJonathan Anderson /* 162cfb5f768SJonathan Anderson * Function to be used by procstat(1) sysctls when returning procdesc 163cfb5f768SJonathan Anderson * information. 164cfb5f768SJonathan Anderson */ 165cfb5f768SJonathan Anderson pid_t 166cfb5f768SJonathan Anderson procdesc_pid(struct file *fp_procdesc) 167cfb5f768SJonathan Anderson { 168cfb5f768SJonathan Anderson struct procdesc *pd; 169cfb5f768SJonathan Anderson 170cfb5f768SJonathan Anderson KASSERT(fp_procdesc->f_type == DTYPE_PROCDESC, 171cfb5f768SJonathan Anderson ("procdesc_pid: !procdesc")); 172cfb5f768SJonathan Anderson 173cfb5f768SJonathan Anderson pd = fp_procdesc->f_data; 174cfb5f768SJonathan Anderson return (pd->pd_pid); 175cfb5f768SJonathan Anderson } 176cfb5f768SJonathan Anderson 177cfb5f768SJonathan Anderson /* 178cfb5f768SJonathan Anderson * Retrieve the PID associated with a process descriptor. 179cfb5f768SJonathan Anderson */ 180cfb5f768SJonathan Anderson int 1817008be5bSPawel Jakub Dawidek kern_pdgetpid(struct thread *td, int fd, cap_rights_t *rightsp, pid_t *pidp) 182cfb5f768SJonathan Anderson { 183cfb5f768SJonathan Anderson struct file *fp; 184cfb5f768SJonathan Anderson int error; 185cfb5f768SJonathan Anderson 1867008be5bSPawel Jakub Dawidek error = fget(td, fd, rightsp, &fp); 187cfb5f768SJonathan Anderson if (error) 188cfb5f768SJonathan Anderson return (error); 189cfb5f768SJonathan Anderson if (fp->f_type != DTYPE_PROCDESC) { 190cfb5f768SJonathan Anderson error = EBADF; 191cfb5f768SJonathan Anderson goto out; 192cfb5f768SJonathan Anderson } 193cfb5f768SJonathan Anderson *pidp = procdesc_pid(fp); 194cfb5f768SJonathan Anderson out: 195cfb5f768SJonathan Anderson fdrop(fp, td); 196cfb5f768SJonathan Anderson return (error); 197cfb5f768SJonathan Anderson } 198cfb5f768SJonathan Anderson 199cfb5f768SJonathan Anderson /* 200cfb5f768SJonathan Anderson * System call to return the pid of a process given its process descriptor. 201cfb5f768SJonathan Anderson */ 202cfb5f768SJonathan Anderson int 2038451d0ddSKip Macy sys_pdgetpid(struct thread *td, struct pdgetpid_args *uap) 204cfb5f768SJonathan Anderson { 2057008be5bSPawel Jakub Dawidek cap_rights_t rights; 206cfb5f768SJonathan Anderson pid_t pid; 207cfb5f768SJonathan Anderson int error; 208cfb5f768SJonathan Anderson 209cfb5f768SJonathan Anderson AUDIT_ARG_FD(uap->fd); 2107008be5bSPawel Jakub Dawidek error = kern_pdgetpid(td, uap->fd, 2117008be5bSPawel Jakub Dawidek cap_rights_init(&rights, CAP_PDGETPID), &pid); 212cfb5f768SJonathan Anderson if (error == 0) 213cfb5f768SJonathan Anderson error = copyout(&pid, uap->pidp, sizeof(pid)); 214cfb5f768SJonathan Anderson return (error); 215cfb5f768SJonathan Anderson } 216cfb5f768SJonathan Anderson 217cfb5f768SJonathan Anderson /* 218cfb5f768SJonathan Anderson * When a new process is forked by pdfork(), a file descriptor is allocated 219cfb5f768SJonathan Anderson * by the fork code first, then the process is forked, and then we get a 220cfb5f768SJonathan Anderson * chance to set up the process descriptor. Failure is not permitted at this 221cfb5f768SJonathan Anderson * point, so procdesc_new() must succeed. 222cfb5f768SJonathan Anderson */ 223cfb5f768SJonathan Anderson void 224cfb5f768SJonathan Anderson procdesc_new(struct proc *p, int flags) 225cfb5f768SJonathan Anderson { 226cfb5f768SJonathan Anderson struct procdesc *pd; 227cfb5f768SJonathan Anderson 228cfb5f768SJonathan Anderson pd = uma_zalloc(procdesc_zone, M_WAITOK | M_ZERO); 229cfb5f768SJonathan Anderson pd->pd_proc = p; 230cfb5f768SJonathan Anderson pd->pd_pid = p->p_pid; 231cfb5f768SJonathan Anderson p->p_procdesc = pd; 232cfb5f768SJonathan Anderson pd->pd_flags = 0; 233cfb5f768SJonathan Anderson if (flags & PD_DAEMON) 234cfb5f768SJonathan Anderson pd->pd_flags |= PDF_DAEMON; 235cfb5f768SJonathan Anderson PROCDESC_LOCK_INIT(pd); 23638219d6aSEd Schouten knlist_init_mtx(&pd->pd_selinfo.si_note, &pd->pd_lock); 237cfb5f768SJonathan Anderson 238cfb5f768SJonathan Anderson /* 239cfb5f768SJonathan Anderson * Process descriptors start out with two references: one from their 240cfb5f768SJonathan Anderson * struct file, and the other from their struct proc. 241cfb5f768SJonathan Anderson */ 242cfb5f768SJonathan Anderson refcount_init(&pd->pd_refcount, 2); 243cfb5f768SJonathan Anderson } 244cfb5f768SJonathan Anderson 245cfb5f768SJonathan Anderson /* 246cfb5f768SJonathan Anderson * Initialize a file with a process descriptor. 247cfb5f768SJonathan Anderson */ 248cfb5f768SJonathan Anderson void 249cfb5f768SJonathan Anderson procdesc_finit(struct procdesc *pdp, struct file *fp) 250cfb5f768SJonathan Anderson { 251cfb5f768SJonathan Anderson 252cfb5f768SJonathan Anderson finit(fp, FREAD | FWRITE, DTYPE_PROCDESC, pdp, &procdesc_ops); 253cfb5f768SJonathan Anderson } 254cfb5f768SJonathan Anderson 255cfb5f768SJonathan Anderson static void 256cfb5f768SJonathan Anderson procdesc_free(struct procdesc *pd) 257cfb5f768SJonathan Anderson { 258cfb5f768SJonathan Anderson 259cfb5f768SJonathan Anderson /* 260cfb5f768SJonathan Anderson * When the last reference is released, we assert that the descriptor 261cfb5f768SJonathan Anderson * has been closed, but not that the process has exited, as we will 262cfb5f768SJonathan Anderson * detach the descriptor before the process dies if the descript is 263cfb5f768SJonathan Anderson * closed, as we can't wait synchronously. 264cfb5f768SJonathan Anderson */ 265cfb5f768SJonathan Anderson if (refcount_release(&pd->pd_refcount)) { 266cfb5f768SJonathan Anderson KASSERT(pd->pd_proc == NULL, 267cfb5f768SJonathan Anderson ("procdesc_free: pd_proc != NULL")); 268cfb5f768SJonathan Anderson KASSERT((pd->pd_flags & PDF_CLOSED), 269cfb5f768SJonathan Anderson ("procdesc_free: !PDF_CLOSED")); 270cfb5f768SJonathan Anderson 27138219d6aSEd Schouten knlist_destroy(&pd->pd_selinfo.si_note); 272cfb5f768SJonathan Anderson PROCDESC_LOCK_DESTROY(pd); 273cfb5f768SJonathan Anderson uma_zfree(procdesc_zone, pd); 274cfb5f768SJonathan Anderson } 275cfb5f768SJonathan Anderson } 276cfb5f768SJonathan Anderson 277cfb5f768SJonathan Anderson /* 278cfb5f768SJonathan Anderson * procdesc_exit() - notify a process descriptor that its process is exiting. 279cfb5f768SJonathan Anderson * We use the proctree_lock to ensure that process exit either happens 280cfb5f768SJonathan Anderson * strictly before or strictly after a concurrent call to procdesc_close(). 281cfb5f768SJonathan Anderson */ 282cfb5f768SJonathan Anderson int 283cfb5f768SJonathan Anderson procdesc_exit(struct proc *p) 284cfb5f768SJonathan Anderson { 285cfb5f768SJonathan Anderson struct procdesc *pd; 286cfb5f768SJonathan Anderson 287cfb5f768SJonathan Anderson sx_assert(&proctree_lock, SA_XLOCKED); 288cfb5f768SJonathan Anderson PROC_LOCK_ASSERT(p, MA_OWNED); 289cfb5f768SJonathan Anderson KASSERT(p->p_procdesc != NULL, ("procdesc_exit: p_procdesc NULL")); 290cfb5f768SJonathan Anderson 291cfb5f768SJonathan Anderson pd = p->p_procdesc; 292cfb5f768SJonathan Anderson 293cfb5f768SJonathan Anderson PROCDESC_LOCK(pd); 294cfb5f768SJonathan Anderson KASSERT((pd->pd_flags & PDF_CLOSED) == 0 || p->p_pptr == initproc, 295cfb5f768SJonathan Anderson ("procdesc_exit: closed && parent not init")); 296cfb5f768SJonathan Anderson 297cfb5f768SJonathan Anderson pd->pd_flags |= PDF_EXITED; 29838219d6aSEd Schouten pd->pd_xstat = p->p_xstat; 299cfb5f768SJonathan Anderson 300cfb5f768SJonathan Anderson /* 301cfb5f768SJonathan Anderson * If the process descriptor has been closed, then we have nothing 302cfb5f768SJonathan Anderson * to do; return 1 so that init will get SIGCHLD and do the reaping. 303cfb5f768SJonathan Anderson * Clean up the procdesc now rather than letting it happen during 304cfb5f768SJonathan Anderson * that reap. 305cfb5f768SJonathan Anderson */ 306cfb5f768SJonathan Anderson if (pd->pd_flags & PDF_CLOSED) { 307cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 308cfb5f768SJonathan Anderson pd->pd_proc = NULL; 309cfb5f768SJonathan Anderson p->p_procdesc = NULL; 310cfb5f768SJonathan Anderson procdesc_free(pd); 311cfb5f768SJonathan Anderson return (1); 312cfb5f768SJonathan Anderson } 313cfb5f768SJonathan Anderson if (pd->pd_flags & PDF_SELECTED) { 314cfb5f768SJonathan Anderson pd->pd_flags &= ~PDF_SELECTED; 315cfb5f768SJonathan Anderson selwakeup(&pd->pd_selinfo); 316cfb5f768SJonathan Anderson } 31738219d6aSEd Schouten KNOTE_LOCKED(&pd->pd_selinfo.si_note, NOTE_EXIT); 318cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 319cfb5f768SJonathan Anderson return (0); 320cfb5f768SJonathan Anderson } 321cfb5f768SJonathan Anderson 322cfb5f768SJonathan Anderson /* 323cfb5f768SJonathan Anderson * When a process descriptor is reaped, perhaps as a result of close() or 324cfb5f768SJonathan Anderson * pdwait4(), release the process's reference on the process descriptor. 325cfb5f768SJonathan Anderson */ 326cfb5f768SJonathan Anderson void 327cfb5f768SJonathan Anderson procdesc_reap(struct proc *p) 328cfb5f768SJonathan Anderson { 329cfb5f768SJonathan Anderson struct procdesc *pd; 330cfb5f768SJonathan Anderson 331cfb5f768SJonathan Anderson sx_assert(&proctree_lock, SA_XLOCKED); 332cfb5f768SJonathan Anderson KASSERT(p->p_procdesc != NULL, ("procdesc_reap: p_procdesc == NULL")); 333cfb5f768SJonathan Anderson 334cfb5f768SJonathan Anderson pd = p->p_procdesc; 335cfb5f768SJonathan Anderson pd->pd_proc = NULL; 336707641ecSPawel Jakub Dawidek p->p_procdesc = NULL; 337cfb5f768SJonathan Anderson procdesc_free(pd); 338cfb5f768SJonathan Anderson } 339cfb5f768SJonathan Anderson 340cfb5f768SJonathan Anderson /* 341cfb5f768SJonathan Anderson * procdesc_close() - last close on a process descriptor. If the process is 34253e16463SPawel Jakub Dawidek * still running, terminate with SIGKILL (unless PDF_DAEMON is set) and let 343cfb5f768SJonathan Anderson * init(8) clean up the mess; if not, we have to clean up the zombie ourselves. 344cfb5f768SJonathan Anderson */ 345cfb5f768SJonathan Anderson static int 346cfb5f768SJonathan Anderson procdesc_close(struct file *fp, struct thread *td) 347cfb5f768SJonathan Anderson { 348cfb5f768SJonathan Anderson struct procdesc *pd; 349cfb5f768SJonathan Anderson struct proc *p; 350cfb5f768SJonathan Anderson 351cfb5f768SJonathan Anderson KASSERT(fp->f_type == DTYPE_PROCDESC, ("procdesc_close: !procdesc")); 352cfb5f768SJonathan Anderson 353cfb5f768SJonathan Anderson pd = fp->f_data; 354cfb5f768SJonathan Anderson fp->f_ops = &badfileops; 355cfb5f768SJonathan Anderson fp->f_data = NULL; 356cfb5f768SJonathan Anderson 357cfb5f768SJonathan Anderson sx_xlock(&proctree_lock); 358cfb5f768SJonathan Anderson PROCDESC_LOCK(pd); 359cfb5f768SJonathan Anderson pd->pd_flags |= PDF_CLOSED; 360cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 361cfb5f768SJonathan Anderson p = pd->pd_proc; 362707641ecSPawel Jakub Dawidek if (p == NULL) { 363707641ecSPawel Jakub Dawidek /* 364707641ecSPawel Jakub Dawidek * This is the case where process' exit status was already 365707641ecSPawel Jakub Dawidek * collected and procdesc_reap() was already called. 366707641ecSPawel Jakub Dawidek */ 367707641ecSPawel Jakub Dawidek sx_xunlock(&proctree_lock); 368a90feb39SEd Schouten } else { 369707641ecSPawel Jakub Dawidek PROC_LOCK(p); 370a90feb39SEd Schouten if (p->p_state == PRS_ZOMBIE) { 371a90feb39SEd Schouten /* 372a90feb39SEd Schouten * If the process is already dead and just awaiting 373a90feb39SEd Schouten * reaping, do that now. This will release the 374a90feb39SEd Schouten * process's reference to the process descriptor when it 375a90feb39SEd Schouten * calls back into procdesc_reap(). 376a90feb39SEd Schouten */ 377cfb5f768SJonathan Anderson PROC_SLOCK(p); 378f13b5a0fSKonstantin Belousov proc_reap(curthread, p, NULL, 0); 379cfb5f768SJonathan Anderson } else { 380cfb5f768SJonathan Anderson /* 381a90feb39SEd Schouten * If the process is not yet dead, we need to kill it, 382a90feb39SEd Schouten * but we can't wait around synchronously for it to go 383a90feb39SEd Schouten * away, as that path leads to madness (and deadlocks). 384a90feb39SEd Schouten * First, detach the process from its descriptor so that 385a90feb39SEd Schouten * its exit status will be reported normally. 386cfb5f768SJonathan Anderson */ 387cfb5f768SJonathan Anderson pd->pd_proc = NULL; 388cfb5f768SJonathan Anderson p->p_procdesc = NULL; 389cfb5f768SJonathan Anderson procdesc_free(pd); 390cfb5f768SJonathan Anderson 391cfb5f768SJonathan Anderson /* 392a90feb39SEd Schouten * Next, reparent it to init(8) so that there's someone 393a90feb39SEd Schouten * to pick up the pieces; finally, terminate with 394a90feb39SEd Schouten * prejudice. 395cfb5f768SJonathan Anderson */ 396cfb5f768SJonathan Anderson p->p_sigparent = SIGCHLD; 397cfb5f768SJonathan Anderson proc_reparent(p, initproc); 39853e16463SPawel Jakub Dawidek if ((pd->pd_flags & PDF_DAEMON) == 0) 3998451d0ddSKip Macy kern_psignal(p, SIGKILL); 400cfb5f768SJonathan Anderson PROC_UNLOCK(p); 401cfb5f768SJonathan Anderson sx_xunlock(&proctree_lock); 402cfb5f768SJonathan Anderson } 403a90feb39SEd Schouten } 404cfb5f768SJonathan Anderson 405cfb5f768SJonathan Anderson /* 406cfb5f768SJonathan Anderson * Release the file descriptor's reference on the process descriptor. 407cfb5f768SJonathan Anderson */ 408cfb5f768SJonathan Anderson procdesc_free(pd); 409cfb5f768SJonathan Anderson return (0); 410cfb5f768SJonathan Anderson } 411cfb5f768SJonathan Anderson 412cfb5f768SJonathan Anderson static int 413cfb5f768SJonathan Anderson procdesc_poll(struct file *fp, int events, struct ucred *active_cred, 414cfb5f768SJonathan Anderson struct thread *td) 415cfb5f768SJonathan Anderson { 416cfb5f768SJonathan Anderson struct procdesc *pd; 417cfb5f768SJonathan Anderson int revents; 418cfb5f768SJonathan Anderson 419cfb5f768SJonathan Anderson revents = 0; 420cfb5f768SJonathan Anderson pd = fp->f_data; 421cfb5f768SJonathan Anderson PROCDESC_LOCK(pd); 422cfb5f768SJonathan Anderson if (pd->pd_flags & PDF_EXITED) 423cfb5f768SJonathan Anderson revents |= POLLHUP; 424cfb5f768SJonathan Anderson if (revents == 0) { 425cfb5f768SJonathan Anderson selrecord(td, &pd->pd_selinfo); 426cfb5f768SJonathan Anderson pd->pd_flags |= PDF_SELECTED; 427cfb5f768SJonathan Anderson } 428cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 429cfb5f768SJonathan Anderson return (revents); 430cfb5f768SJonathan Anderson } 431cfb5f768SJonathan Anderson 43238219d6aSEd Schouten static void 43338219d6aSEd Schouten procdesc_kqops_detach(struct knote *kn) 43438219d6aSEd Schouten { 43538219d6aSEd Schouten struct procdesc *pd; 43638219d6aSEd Schouten 43738219d6aSEd Schouten pd = kn->kn_fp->f_data; 43838219d6aSEd Schouten knlist_remove(&pd->pd_selinfo.si_note, kn, 0); 43938219d6aSEd Schouten } 44038219d6aSEd Schouten 44138219d6aSEd Schouten static int 44238219d6aSEd Schouten procdesc_kqops_event(struct knote *kn, long hint) 44338219d6aSEd Schouten { 44438219d6aSEd Schouten struct procdesc *pd; 44538219d6aSEd Schouten u_int event; 44638219d6aSEd Schouten 44738219d6aSEd Schouten pd = kn->kn_fp->f_data; 44838219d6aSEd Schouten if (hint == 0) { 44938219d6aSEd Schouten /* 45038219d6aSEd Schouten * Initial test after registration. Generate a NOTE_EXIT in 45138219d6aSEd Schouten * case the process already terminated before registration. 45238219d6aSEd Schouten */ 45338219d6aSEd Schouten event = pd->pd_flags & PDF_EXITED ? NOTE_EXIT : 0; 45438219d6aSEd Schouten } else { 45538219d6aSEd Schouten /* Mask off extra data. */ 45638219d6aSEd Schouten event = (u_int)hint & NOTE_PCTRLMASK; 45738219d6aSEd Schouten } 45838219d6aSEd Schouten 45938219d6aSEd Schouten /* If the user is interested in this event, record it. */ 46038219d6aSEd Schouten if (kn->kn_sfflags & event) 46138219d6aSEd Schouten kn->kn_fflags |= event; 46238219d6aSEd Schouten 46338219d6aSEd Schouten /* Process is gone, so flag the event as finished. */ 46438219d6aSEd Schouten if (event == NOTE_EXIT) { 46538219d6aSEd Schouten kn->kn_flags |= EV_EOF | EV_ONESHOT; 46638219d6aSEd Schouten if (kn->kn_fflags & NOTE_EXIT) 46738219d6aSEd Schouten kn->kn_data = pd->pd_xstat; 46838219d6aSEd Schouten if (kn->kn_fflags == 0) 46938219d6aSEd Schouten kn->kn_flags |= EV_DROP; 47038219d6aSEd Schouten return (1); 47138219d6aSEd Schouten } 47238219d6aSEd Schouten 47338219d6aSEd Schouten return (kn->kn_fflags != 0); 47438219d6aSEd Schouten } 47538219d6aSEd Schouten 47638219d6aSEd Schouten static struct filterops procdesc_kqops = { 47738219d6aSEd Schouten .f_isfd = 1, 47838219d6aSEd Schouten .f_detach = procdesc_kqops_detach, 47938219d6aSEd Schouten .f_event = procdesc_kqops_event, 48038219d6aSEd Schouten }; 48138219d6aSEd Schouten 482cfb5f768SJonathan Anderson static int 483cfb5f768SJonathan Anderson procdesc_kqfilter(struct file *fp, struct knote *kn) 484cfb5f768SJonathan Anderson { 48538219d6aSEd Schouten struct procdesc *pd; 486cfb5f768SJonathan Anderson 48738219d6aSEd Schouten pd = fp->f_data; 48838219d6aSEd Schouten switch (kn->kn_filter) { 48938219d6aSEd Schouten case EVFILT_PROCDESC: 49038219d6aSEd Schouten kn->kn_fop = &procdesc_kqops; 49138219d6aSEd Schouten kn->kn_flags |= EV_CLEAR; 49238219d6aSEd Schouten knlist_add(&pd->pd_selinfo.si_note, kn, 0); 49338219d6aSEd Schouten return (0); 49438219d6aSEd Schouten default: 49538219d6aSEd Schouten return (EINVAL); 49638219d6aSEd Schouten } 497cfb5f768SJonathan Anderson } 498cfb5f768SJonathan Anderson 499cfb5f768SJonathan Anderson static int 500cfb5f768SJonathan Anderson procdesc_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 501cfb5f768SJonathan Anderson struct thread *td) 502cfb5f768SJonathan Anderson { 503cfb5f768SJonathan Anderson struct procdesc *pd; 504cfb5f768SJonathan Anderson struct timeval pstart; 505cfb5f768SJonathan Anderson 506cfb5f768SJonathan Anderson /* 507cfb5f768SJonathan Anderson * XXXRW: Perhaps we should cache some more information from the 508cfb5f768SJonathan Anderson * process so that we can return it reliably here even after it has 509cfb5f768SJonathan Anderson * died. For example, caching its credential data. 510cfb5f768SJonathan Anderson */ 511cfb5f768SJonathan Anderson bzero(sb, sizeof(*sb)); 512cfb5f768SJonathan Anderson pd = fp->f_data; 513cfb5f768SJonathan Anderson sx_slock(&proctree_lock); 514cfb5f768SJonathan Anderson if (pd->pd_proc != NULL) { 515cfb5f768SJonathan Anderson PROC_LOCK(pd->pd_proc); 516cfb5f768SJonathan Anderson 517cfb5f768SJonathan Anderson /* Set birth and [acm] times to process start time. */ 518cfb5f768SJonathan Anderson pstart = pd->pd_proc->p_stats->p_start; 519cfb5f768SJonathan Anderson timevaladd(&pstart, &boottime); 520cfb5f768SJonathan Anderson TIMEVAL_TO_TIMESPEC(&pstart, &sb->st_birthtim); 521cfb5f768SJonathan Anderson sb->st_atim = sb->st_birthtim; 522cfb5f768SJonathan Anderson sb->st_ctim = sb->st_birthtim; 523cfb5f768SJonathan Anderson sb->st_mtim = sb->st_birthtim; 524cfb5f768SJonathan Anderson if (pd->pd_proc->p_state != PRS_ZOMBIE) 525cfb5f768SJonathan Anderson sb->st_mode = S_IFREG | S_IRWXU; 526cfb5f768SJonathan Anderson else 527cfb5f768SJonathan Anderson sb->st_mode = S_IFREG; 528cfb5f768SJonathan Anderson sb->st_uid = pd->pd_proc->p_ucred->cr_ruid; 529cfb5f768SJonathan Anderson sb->st_gid = pd->pd_proc->p_ucred->cr_rgid; 530cfb5f768SJonathan Anderson PROC_UNLOCK(pd->pd_proc); 531cfb5f768SJonathan Anderson } else 532cfb5f768SJonathan Anderson sb->st_mode = S_IFREG; 533cfb5f768SJonathan Anderson sx_sunlock(&proctree_lock); 534cfb5f768SJonathan Anderson return (0); 535cfb5f768SJonathan Anderson } 536cfb5f768SJonathan Anderson 5379696feebSJohn Baldwin static int 5389696feebSJohn Baldwin procdesc_fill_kinfo(struct file *fp, struct kinfo_file *kif, 5399696feebSJohn Baldwin struct filedesc *fdp) 5409696feebSJohn Baldwin { 5419696feebSJohn Baldwin struct procdesc *pdp; 5429696feebSJohn Baldwin 5439696feebSJohn Baldwin kif->kf_type = KF_TYPE_PROCDESC; 5449696feebSJohn Baldwin pdp = fp->f_data; 5459696feebSJohn Baldwin kif->kf_un.kf_proc.kf_pid = pdp->pd_pid; 5469696feebSJohn Baldwin return (0); 5479696feebSJohn Baldwin } 548