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 58cfb5f768SJonathan Anderson * descriptors to be created for processes without pfork(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> 81cfb5f768SJonathan Anderson 82cfb5f768SJonathan Anderson #include <security/audit/audit.h> 83cfb5f768SJonathan Anderson 84cfb5f768SJonathan Anderson #include <vm/uma.h> 85cfb5f768SJonathan Anderson 86cfb5f768SJonathan Anderson FEATURE(process_descriptors, "Process Descriptors"); 87cfb5f768SJonathan Anderson 88cfb5f768SJonathan Anderson static uma_zone_t procdesc_zone; 89cfb5f768SJonathan Anderson 90cfb5f768SJonathan Anderson static fo_rdwr_t procdesc_read; 91cfb5f768SJonathan Anderson static fo_rdwr_t procdesc_write; 92cfb5f768SJonathan Anderson static fo_truncate_t procdesc_truncate; 93cfb5f768SJonathan Anderson static fo_ioctl_t procdesc_ioctl; 94cfb5f768SJonathan Anderson static fo_poll_t procdesc_poll; 95cfb5f768SJonathan Anderson static fo_kqfilter_t procdesc_kqfilter; 96cfb5f768SJonathan Anderson static fo_stat_t procdesc_stat; 97cfb5f768SJonathan Anderson static fo_close_t procdesc_close; 98cfb5f768SJonathan Anderson static fo_chmod_t procdesc_chmod; 99cfb5f768SJonathan Anderson static fo_chown_t procdesc_chown; 100cfb5f768SJonathan Anderson 101cfb5f768SJonathan Anderson static struct fileops procdesc_ops = { 102cfb5f768SJonathan Anderson .fo_read = procdesc_read, 103cfb5f768SJonathan Anderson .fo_write = procdesc_write, 104cfb5f768SJonathan Anderson .fo_truncate = procdesc_truncate, 105cfb5f768SJonathan Anderson .fo_ioctl = procdesc_ioctl, 106cfb5f768SJonathan Anderson .fo_poll = procdesc_poll, 107cfb5f768SJonathan Anderson .fo_kqfilter = procdesc_kqfilter, 108cfb5f768SJonathan Anderson .fo_stat = procdesc_stat, 109cfb5f768SJonathan Anderson .fo_close = procdesc_close, 110cfb5f768SJonathan Anderson .fo_chmod = procdesc_chmod, 111cfb5f768SJonathan Anderson .fo_chown = procdesc_chown, 112b1dd38f4SKonstantin Belousov .fo_sendfile = invfo_sendfile, 113cfb5f768SJonathan Anderson .fo_flags = DFLAG_PASSABLE, 114cfb5f768SJonathan Anderson }; 115cfb5f768SJonathan Anderson 116cfb5f768SJonathan Anderson /* 117cfb5f768SJonathan Anderson * Initialize with VFS so that process descriptors are available along with 118cfb5f768SJonathan Anderson * other file descriptor types. As long as it runs before init(8) starts, 119cfb5f768SJonathan Anderson * there shouldn't be a problem. 120cfb5f768SJonathan Anderson */ 121cfb5f768SJonathan Anderson static void 122cfb5f768SJonathan Anderson procdesc_init(void *dummy __unused) 123cfb5f768SJonathan Anderson { 124cfb5f768SJonathan Anderson 125cfb5f768SJonathan Anderson procdesc_zone = uma_zcreate("procdesc", sizeof(struct procdesc), 126cfb5f768SJonathan Anderson NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 127cfb5f768SJonathan Anderson if (procdesc_zone == NULL) 128cfb5f768SJonathan Anderson panic("procdesc_init: procdesc_zone not initialized"); 129cfb5f768SJonathan Anderson } 130cfb5f768SJonathan Anderson SYSINIT(vfs, SI_SUB_VFS, SI_ORDER_ANY, procdesc_init, NULL); 131cfb5f768SJonathan Anderson 132cfb5f768SJonathan Anderson /* 133cfb5f768SJonathan Anderson * Return a locked process given a process descriptor, or ESRCH if it has 134cfb5f768SJonathan Anderson * died. 135cfb5f768SJonathan Anderson */ 136cfb5f768SJonathan Anderson int 1377008be5bSPawel Jakub Dawidek procdesc_find(struct thread *td, int fd, cap_rights_t *rightsp, 138cfb5f768SJonathan Anderson struct proc **p) 139cfb5f768SJonathan Anderson { 140cfb5f768SJonathan Anderson struct procdesc *pd; 141cfb5f768SJonathan Anderson struct file *fp; 142cfb5f768SJonathan Anderson int error; 143cfb5f768SJonathan Anderson 1447008be5bSPawel Jakub Dawidek error = fget(td, fd, rightsp, &fp); 145cfb5f768SJonathan Anderson if (error) 146cfb5f768SJonathan Anderson return (error); 147cfb5f768SJonathan Anderson if (fp->f_type != DTYPE_PROCDESC) { 148cfb5f768SJonathan Anderson error = EBADF; 149cfb5f768SJonathan Anderson goto out; 150cfb5f768SJonathan Anderson } 151cfb5f768SJonathan Anderson pd = fp->f_data; 152cfb5f768SJonathan Anderson sx_slock(&proctree_lock); 153cfb5f768SJonathan Anderson if (pd->pd_proc != NULL) { 154cfb5f768SJonathan Anderson *p = pd->pd_proc; 155cfb5f768SJonathan Anderson PROC_LOCK(*p); 156cfb5f768SJonathan Anderson } else 157cfb5f768SJonathan Anderson error = ESRCH; 158cfb5f768SJonathan Anderson sx_sunlock(&proctree_lock); 159cfb5f768SJonathan Anderson out: 160cfb5f768SJonathan Anderson fdrop(fp, td); 161cfb5f768SJonathan Anderson return (error); 162cfb5f768SJonathan Anderson } 163cfb5f768SJonathan Anderson 164cfb5f768SJonathan Anderson /* 165cfb5f768SJonathan Anderson * Function to be used by procstat(1) sysctls when returning procdesc 166cfb5f768SJonathan Anderson * information. 167cfb5f768SJonathan Anderson */ 168cfb5f768SJonathan Anderson pid_t 169cfb5f768SJonathan Anderson procdesc_pid(struct file *fp_procdesc) 170cfb5f768SJonathan Anderson { 171cfb5f768SJonathan Anderson struct procdesc *pd; 172cfb5f768SJonathan Anderson 173cfb5f768SJonathan Anderson KASSERT(fp_procdesc->f_type == DTYPE_PROCDESC, 174cfb5f768SJonathan Anderson ("procdesc_pid: !procdesc")); 175cfb5f768SJonathan Anderson 176cfb5f768SJonathan Anderson pd = fp_procdesc->f_data; 177cfb5f768SJonathan Anderson return (pd->pd_pid); 178cfb5f768SJonathan Anderson } 179cfb5f768SJonathan Anderson 180cfb5f768SJonathan Anderson /* 181cfb5f768SJonathan Anderson * Retrieve the PID associated with a process descriptor. 182cfb5f768SJonathan Anderson */ 183cfb5f768SJonathan Anderson int 1847008be5bSPawel Jakub Dawidek kern_pdgetpid(struct thread *td, int fd, cap_rights_t *rightsp, pid_t *pidp) 185cfb5f768SJonathan Anderson { 186cfb5f768SJonathan Anderson struct file *fp; 187cfb5f768SJonathan Anderson int error; 188cfb5f768SJonathan Anderson 1897008be5bSPawel Jakub Dawidek error = fget(td, fd, rightsp, &fp); 190cfb5f768SJonathan Anderson if (error) 191cfb5f768SJonathan Anderson return (error); 192cfb5f768SJonathan Anderson if (fp->f_type != DTYPE_PROCDESC) { 193cfb5f768SJonathan Anderson error = EBADF; 194cfb5f768SJonathan Anderson goto out; 195cfb5f768SJonathan Anderson } 196cfb5f768SJonathan Anderson *pidp = procdesc_pid(fp); 197cfb5f768SJonathan Anderson out: 198cfb5f768SJonathan Anderson fdrop(fp, td); 199cfb5f768SJonathan Anderson return (error); 200cfb5f768SJonathan Anderson } 201cfb5f768SJonathan Anderson 202cfb5f768SJonathan Anderson /* 203cfb5f768SJonathan Anderson * System call to return the pid of a process given its process descriptor. 204cfb5f768SJonathan Anderson */ 205cfb5f768SJonathan Anderson int 2068451d0ddSKip Macy sys_pdgetpid(struct thread *td, struct pdgetpid_args *uap) 207cfb5f768SJonathan Anderson { 2087008be5bSPawel Jakub Dawidek cap_rights_t rights; 209cfb5f768SJonathan Anderson pid_t pid; 210cfb5f768SJonathan Anderson int error; 211cfb5f768SJonathan Anderson 212cfb5f768SJonathan Anderson AUDIT_ARG_FD(uap->fd); 2137008be5bSPawel Jakub Dawidek error = kern_pdgetpid(td, uap->fd, 2147008be5bSPawel Jakub Dawidek cap_rights_init(&rights, CAP_PDGETPID), &pid); 215cfb5f768SJonathan Anderson if (error == 0) 216cfb5f768SJonathan Anderson error = copyout(&pid, uap->pidp, sizeof(pid)); 217cfb5f768SJonathan Anderson return (error); 218cfb5f768SJonathan Anderson } 219cfb5f768SJonathan Anderson 220cfb5f768SJonathan Anderson /* 221cfb5f768SJonathan Anderson * When a new process is forked by pdfork(), a file descriptor is allocated 222cfb5f768SJonathan Anderson * by the fork code first, then the process is forked, and then we get a 223cfb5f768SJonathan Anderson * chance to set up the process descriptor. Failure is not permitted at this 224cfb5f768SJonathan Anderson * point, so procdesc_new() must succeed. 225cfb5f768SJonathan Anderson */ 226cfb5f768SJonathan Anderson void 227cfb5f768SJonathan Anderson procdesc_new(struct proc *p, int flags) 228cfb5f768SJonathan Anderson { 229cfb5f768SJonathan Anderson struct procdesc *pd; 230cfb5f768SJonathan Anderson 231cfb5f768SJonathan Anderson pd = uma_zalloc(procdesc_zone, M_WAITOK | M_ZERO); 232cfb5f768SJonathan Anderson pd->pd_proc = p; 233cfb5f768SJonathan Anderson pd->pd_pid = p->p_pid; 234cfb5f768SJonathan Anderson p->p_procdesc = pd; 235cfb5f768SJonathan Anderson pd->pd_flags = 0; 236cfb5f768SJonathan Anderson if (flags & PD_DAEMON) 237cfb5f768SJonathan Anderson pd->pd_flags |= PDF_DAEMON; 238cfb5f768SJonathan Anderson PROCDESC_LOCK_INIT(pd); 239cfb5f768SJonathan Anderson 240cfb5f768SJonathan Anderson /* 241cfb5f768SJonathan Anderson * Process descriptors start out with two references: one from their 242cfb5f768SJonathan Anderson * struct file, and the other from their struct proc. 243cfb5f768SJonathan Anderson */ 244cfb5f768SJonathan Anderson refcount_init(&pd->pd_refcount, 2); 245cfb5f768SJonathan Anderson } 246cfb5f768SJonathan Anderson 247cfb5f768SJonathan Anderson /* 248cfb5f768SJonathan Anderson * Initialize a file with a process descriptor. 249cfb5f768SJonathan Anderson */ 250cfb5f768SJonathan Anderson void 251cfb5f768SJonathan Anderson procdesc_finit(struct procdesc *pdp, struct file *fp) 252cfb5f768SJonathan Anderson { 253cfb5f768SJonathan Anderson 254cfb5f768SJonathan Anderson finit(fp, FREAD | FWRITE, DTYPE_PROCDESC, pdp, &procdesc_ops); 255cfb5f768SJonathan Anderson } 256cfb5f768SJonathan Anderson 257cfb5f768SJonathan Anderson static void 258cfb5f768SJonathan Anderson procdesc_free(struct procdesc *pd) 259cfb5f768SJonathan Anderson { 260cfb5f768SJonathan Anderson 261cfb5f768SJonathan Anderson /* 262cfb5f768SJonathan Anderson * When the last reference is released, we assert that the descriptor 263cfb5f768SJonathan Anderson * has been closed, but not that the process has exited, as we will 264cfb5f768SJonathan Anderson * detach the descriptor before the process dies if the descript is 265cfb5f768SJonathan Anderson * closed, as we can't wait synchronously. 266cfb5f768SJonathan Anderson */ 267cfb5f768SJonathan Anderson if (refcount_release(&pd->pd_refcount)) { 268cfb5f768SJonathan Anderson KASSERT(pd->pd_proc == NULL, 269cfb5f768SJonathan Anderson ("procdesc_free: pd_proc != NULL")); 270cfb5f768SJonathan Anderson KASSERT((pd->pd_flags & PDF_CLOSED), 271cfb5f768SJonathan Anderson ("procdesc_free: !PDF_CLOSED")); 272cfb5f768SJonathan Anderson 273cfb5f768SJonathan Anderson PROCDESC_LOCK_DESTROY(pd); 274cfb5f768SJonathan Anderson uma_zfree(procdesc_zone, pd); 275cfb5f768SJonathan Anderson } 276cfb5f768SJonathan Anderson } 277cfb5f768SJonathan Anderson 278cfb5f768SJonathan Anderson /* 279cfb5f768SJonathan Anderson * procdesc_exit() - notify a process descriptor that its process is exiting. 280cfb5f768SJonathan Anderson * We use the proctree_lock to ensure that process exit either happens 281cfb5f768SJonathan Anderson * strictly before or strictly after a concurrent call to procdesc_close(). 282cfb5f768SJonathan Anderson */ 283cfb5f768SJonathan Anderson int 284cfb5f768SJonathan Anderson procdesc_exit(struct proc *p) 285cfb5f768SJonathan Anderson { 286cfb5f768SJonathan Anderson struct procdesc *pd; 287cfb5f768SJonathan Anderson 288cfb5f768SJonathan Anderson sx_assert(&proctree_lock, SA_XLOCKED); 289cfb5f768SJonathan Anderson PROC_LOCK_ASSERT(p, MA_OWNED); 290cfb5f768SJonathan Anderson KASSERT(p->p_procdesc != NULL, ("procdesc_exit: p_procdesc NULL")); 291cfb5f768SJonathan Anderson 292cfb5f768SJonathan Anderson pd = p->p_procdesc; 293cfb5f768SJonathan Anderson 294cfb5f768SJonathan Anderson PROCDESC_LOCK(pd); 295cfb5f768SJonathan Anderson KASSERT((pd->pd_flags & PDF_CLOSED) == 0 || p->p_pptr == initproc, 296cfb5f768SJonathan Anderson ("procdesc_exit: closed && parent not init")); 297cfb5f768SJonathan Anderson 298cfb5f768SJonathan Anderson pd->pd_flags |= PDF_EXITED; 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 } 317cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 318cfb5f768SJonathan Anderson return (0); 319cfb5f768SJonathan Anderson } 320cfb5f768SJonathan Anderson 321cfb5f768SJonathan Anderson /* 322cfb5f768SJonathan Anderson * When a process descriptor is reaped, perhaps as a result of close() or 323cfb5f768SJonathan Anderson * pdwait4(), release the process's reference on the process descriptor. 324cfb5f768SJonathan Anderson */ 325cfb5f768SJonathan Anderson void 326cfb5f768SJonathan Anderson procdesc_reap(struct proc *p) 327cfb5f768SJonathan Anderson { 328cfb5f768SJonathan Anderson struct procdesc *pd; 329cfb5f768SJonathan Anderson 330cfb5f768SJonathan Anderson sx_assert(&proctree_lock, SA_XLOCKED); 331cfb5f768SJonathan Anderson KASSERT(p->p_procdesc != NULL, ("procdesc_reap: p_procdesc == NULL")); 332cfb5f768SJonathan Anderson 333cfb5f768SJonathan Anderson pd = p->p_procdesc; 334cfb5f768SJonathan Anderson pd->pd_proc = NULL; 335707641ecSPawel Jakub Dawidek p->p_procdesc = NULL; 336cfb5f768SJonathan Anderson procdesc_free(pd); 337cfb5f768SJonathan Anderson } 338cfb5f768SJonathan Anderson 339cfb5f768SJonathan Anderson /* 340cfb5f768SJonathan Anderson * procdesc_close() - last close on a process descriptor. If the process is 34153e16463SPawel Jakub Dawidek * still running, terminate with SIGKILL (unless PDF_DAEMON is set) and let 342cfb5f768SJonathan Anderson * init(8) clean up the mess; if not, we have to clean up the zombie ourselves. 343cfb5f768SJonathan Anderson */ 344cfb5f768SJonathan Anderson static int 345cfb5f768SJonathan Anderson procdesc_close(struct file *fp, struct thread *td) 346cfb5f768SJonathan Anderson { 347cfb5f768SJonathan Anderson struct procdesc *pd; 348cfb5f768SJonathan Anderson struct proc *p; 349cfb5f768SJonathan Anderson 350cfb5f768SJonathan Anderson KASSERT(fp->f_type == DTYPE_PROCDESC, ("procdesc_close: !procdesc")); 351cfb5f768SJonathan Anderson 352cfb5f768SJonathan Anderson pd = fp->f_data; 353cfb5f768SJonathan Anderson fp->f_ops = &badfileops; 354cfb5f768SJonathan Anderson fp->f_data = NULL; 355cfb5f768SJonathan Anderson 356cfb5f768SJonathan Anderson sx_xlock(&proctree_lock); 357cfb5f768SJonathan Anderson PROCDESC_LOCK(pd); 358cfb5f768SJonathan Anderson pd->pd_flags |= PDF_CLOSED; 359cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 360cfb5f768SJonathan Anderson p = pd->pd_proc; 361707641ecSPawel Jakub Dawidek if (p == NULL) { 362707641ecSPawel Jakub Dawidek /* 363707641ecSPawel Jakub Dawidek * This is the case where process' exit status was already 364707641ecSPawel Jakub Dawidek * collected and procdesc_reap() was already called. 365707641ecSPawel Jakub Dawidek */ 366707641ecSPawel Jakub Dawidek sx_xunlock(&proctree_lock); 367707641ecSPawel Jakub Dawidek } else if (p->p_state == PRS_ZOMBIE) { 368cfb5f768SJonathan Anderson /* 369cfb5f768SJonathan Anderson * If the process is already dead and just awaiting reaping, 370cfb5f768SJonathan Anderson * do that now. This will release the process's reference to 371cfb5f768SJonathan Anderson * the process descriptor when it calls back into 372cfb5f768SJonathan Anderson * procdesc_reap(). 373cfb5f768SJonathan Anderson */ 374707641ecSPawel Jakub Dawidek PROC_LOCK(p); 375cfb5f768SJonathan Anderson PROC_SLOCK(p); 376f13b5a0fSKonstantin Belousov proc_reap(curthread, p, NULL, 0); 377cfb5f768SJonathan Anderson } else { 378cfb5f768SJonathan Anderson /* 379cfb5f768SJonathan Anderson * If the process is not yet dead, we need to kill it, but we 380cfb5f768SJonathan Anderson * can't wait around synchronously for it to go away, as that 381cfb5f768SJonathan Anderson * path leads to madness (and deadlocks). First, detach the 382cfb5f768SJonathan Anderson * process from its descriptor so that its exit status will 383cfb5f768SJonathan Anderson * be reported normally. 384cfb5f768SJonathan Anderson */ 385707641ecSPawel Jakub Dawidek PROC_LOCK(p); 386cfb5f768SJonathan Anderson pd->pd_proc = NULL; 387cfb5f768SJonathan Anderson p->p_procdesc = NULL; 388cfb5f768SJonathan Anderson procdesc_free(pd); 389cfb5f768SJonathan Anderson 390cfb5f768SJonathan Anderson /* 391cfb5f768SJonathan Anderson * Next, reparent it to init(8) so that there's someone to 392cfb5f768SJonathan Anderson * pick up the pieces; finally, terminate with prejudice. 393cfb5f768SJonathan Anderson */ 394cfb5f768SJonathan Anderson p->p_sigparent = SIGCHLD; 395cfb5f768SJonathan Anderson proc_reparent(p, initproc); 39653e16463SPawel Jakub Dawidek if ((pd->pd_flags & PDF_DAEMON) == 0) 3978451d0ddSKip Macy kern_psignal(p, SIGKILL); 398cfb5f768SJonathan Anderson PROC_UNLOCK(p); 399cfb5f768SJonathan Anderson sx_xunlock(&proctree_lock); 400cfb5f768SJonathan Anderson } 401cfb5f768SJonathan Anderson 402cfb5f768SJonathan Anderson /* 403cfb5f768SJonathan Anderson * Release the file descriptor's reference on the process descriptor. 404cfb5f768SJonathan Anderson */ 405cfb5f768SJonathan Anderson procdesc_free(pd); 406cfb5f768SJonathan Anderson return (0); 407cfb5f768SJonathan Anderson } 408cfb5f768SJonathan Anderson 409cfb5f768SJonathan Anderson static int 410cfb5f768SJonathan Anderson procdesc_read(struct file *fp, struct uio *uio, struct ucred *active_cred, 411cfb5f768SJonathan Anderson int flags, struct thread *td) 412cfb5f768SJonathan Anderson { 413cfb5f768SJonathan Anderson 414cfb5f768SJonathan Anderson return (EOPNOTSUPP); 415cfb5f768SJonathan Anderson } 416cfb5f768SJonathan Anderson 417cfb5f768SJonathan Anderson static int 418cfb5f768SJonathan Anderson procdesc_write(struct file *fp, struct uio *uio, struct ucred *active_cred, 419cfb5f768SJonathan Anderson int flags, struct thread *td) 420cfb5f768SJonathan Anderson { 421cfb5f768SJonathan Anderson 422cfb5f768SJonathan Anderson return (EOPNOTSUPP); 423cfb5f768SJonathan Anderson } 424cfb5f768SJonathan Anderson 425cfb5f768SJonathan Anderson static int 426cfb5f768SJonathan Anderson procdesc_truncate(struct file *fp, off_t length, struct ucred *active_cred, 427cfb5f768SJonathan Anderson struct thread *td) 428cfb5f768SJonathan Anderson { 429cfb5f768SJonathan Anderson 430cfb5f768SJonathan Anderson return (EOPNOTSUPP); 431cfb5f768SJonathan Anderson } 432cfb5f768SJonathan Anderson 433cfb5f768SJonathan Anderson static int 434cfb5f768SJonathan Anderson procdesc_ioctl(struct file *fp, u_long com, void *data, 435cfb5f768SJonathan Anderson struct ucred *active_cred, struct thread *td) 436cfb5f768SJonathan Anderson { 437cfb5f768SJonathan Anderson 438cfb5f768SJonathan Anderson return (EOPNOTSUPP); 439cfb5f768SJonathan Anderson } 440cfb5f768SJonathan Anderson 441cfb5f768SJonathan Anderson static int 442cfb5f768SJonathan Anderson procdesc_poll(struct file *fp, int events, struct ucred *active_cred, 443cfb5f768SJonathan Anderson struct thread *td) 444cfb5f768SJonathan Anderson { 445cfb5f768SJonathan Anderson struct procdesc *pd; 446cfb5f768SJonathan Anderson int revents; 447cfb5f768SJonathan Anderson 448cfb5f768SJonathan Anderson revents = 0; 449cfb5f768SJonathan Anderson pd = fp->f_data; 450cfb5f768SJonathan Anderson PROCDESC_LOCK(pd); 451cfb5f768SJonathan Anderson if (pd->pd_flags & PDF_EXITED) 452cfb5f768SJonathan Anderson revents |= POLLHUP; 453cfb5f768SJonathan Anderson if (revents == 0) { 454cfb5f768SJonathan Anderson selrecord(td, &pd->pd_selinfo); 455cfb5f768SJonathan Anderson pd->pd_flags |= PDF_SELECTED; 456cfb5f768SJonathan Anderson } 457cfb5f768SJonathan Anderson PROCDESC_UNLOCK(pd); 458cfb5f768SJonathan Anderson return (revents); 459cfb5f768SJonathan Anderson } 460cfb5f768SJonathan Anderson 461cfb5f768SJonathan Anderson static int 462cfb5f768SJonathan Anderson procdesc_kqfilter(struct file *fp, struct knote *kn) 463cfb5f768SJonathan Anderson { 464cfb5f768SJonathan Anderson 465cfb5f768SJonathan Anderson return (EOPNOTSUPP); 466cfb5f768SJonathan Anderson } 467cfb5f768SJonathan Anderson 468cfb5f768SJonathan Anderson static int 469cfb5f768SJonathan Anderson procdesc_stat(struct file *fp, struct stat *sb, struct ucred *active_cred, 470cfb5f768SJonathan Anderson struct thread *td) 471cfb5f768SJonathan Anderson { 472cfb5f768SJonathan Anderson struct procdesc *pd; 473cfb5f768SJonathan Anderson struct timeval pstart; 474cfb5f768SJonathan Anderson 475cfb5f768SJonathan Anderson /* 476cfb5f768SJonathan Anderson * XXXRW: Perhaps we should cache some more information from the 477cfb5f768SJonathan Anderson * process so that we can return it reliably here even after it has 478cfb5f768SJonathan Anderson * died. For example, caching its credential data. 479cfb5f768SJonathan Anderson */ 480cfb5f768SJonathan Anderson bzero(sb, sizeof(*sb)); 481cfb5f768SJonathan Anderson pd = fp->f_data; 482cfb5f768SJonathan Anderson sx_slock(&proctree_lock); 483cfb5f768SJonathan Anderson if (pd->pd_proc != NULL) { 484cfb5f768SJonathan Anderson PROC_LOCK(pd->pd_proc); 485cfb5f768SJonathan Anderson 486cfb5f768SJonathan Anderson /* Set birth and [acm] times to process start time. */ 487cfb5f768SJonathan Anderson pstart = pd->pd_proc->p_stats->p_start; 488cfb5f768SJonathan Anderson timevaladd(&pstart, &boottime); 489cfb5f768SJonathan Anderson TIMEVAL_TO_TIMESPEC(&pstart, &sb->st_birthtim); 490cfb5f768SJonathan Anderson sb->st_atim = sb->st_birthtim; 491cfb5f768SJonathan Anderson sb->st_ctim = sb->st_birthtim; 492cfb5f768SJonathan Anderson sb->st_mtim = sb->st_birthtim; 493cfb5f768SJonathan Anderson if (pd->pd_proc->p_state != PRS_ZOMBIE) 494cfb5f768SJonathan Anderson sb->st_mode = S_IFREG | S_IRWXU; 495cfb5f768SJonathan Anderson else 496cfb5f768SJonathan Anderson sb->st_mode = S_IFREG; 497cfb5f768SJonathan Anderson sb->st_uid = pd->pd_proc->p_ucred->cr_ruid; 498cfb5f768SJonathan Anderson sb->st_gid = pd->pd_proc->p_ucred->cr_rgid; 499cfb5f768SJonathan Anderson PROC_UNLOCK(pd->pd_proc); 500cfb5f768SJonathan Anderson } else 501cfb5f768SJonathan Anderson sb->st_mode = S_IFREG; 502cfb5f768SJonathan Anderson sx_sunlock(&proctree_lock); 503cfb5f768SJonathan Anderson return (0); 504cfb5f768SJonathan Anderson } 505cfb5f768SJonathan Anderson 506cfb5f768SJonathan Anderson static int 507cfb5f768SJonathan Anderson procdesc_chmod(struct file *fp, mode_t mode, struct ucred *active_cred, 508cfb5f768SJonathan Anderson struct thread *td) 509cfb5f768SJonathan Anderson { 510cfb5f768SJonathan Anderson 511cfb5f768SJonathan Anderson return (EOPNOTSUPP); 512cfb5f768SJonathan Anderson } 513cfb5f768SJonathan Anderson 514cfb5f768SJonathan Anderson static int 515cfb5f768SJonathan Anderson procdesc_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred, 516cfb5f768SJonathan Anderson struct thread *td) 517cfb5f768SJonathan Anderson { 518cfb5f768SJonathan Anderson 519cfb5f768SJonathan Anderson return (EOPNOTSUPP); 520cfb5f768SJonathan Anderson } 521