1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/proc/array.c 4 * 5 * Copyright (C) 1992 by Linus Torvalds 6 * based on ideas by Darren Senn 7 * 8 * Fixes: 9 * Michael. K. Johnson: stat,statm extensions. 10 * <johnsonm@stolaf.edu> 11 * 12 * Pauline Middelink : Made cmdline,envline only break at '\0's, to 13 * make sure SET_PROCTITLE works. Also removed 14 * bad '!' which forced address recalculation for 15 * EVERY character on the current page. 16 * <middelin@polyware.iaf.nl> 17 * 18 * Danny ter Haar : added cpuinfo 19 * <dth@cistron.nl> 20 * 21 * Alessandro Rubini : profile extension. 22 * <rubini@ipvvis.unipv.it> 23 * 24 * Jeff Tranter : added BogoMips field to cpuinfo 25 * <Jeff_Tranter@Mitel.COM> 26 * 27 * Bruno Haible : remove 4K limit for the maps file 28 * <haible@ma2s2.mathematik.uni-karlsruhe.de> 29 * 30 * Yves Arrouye : remove removal of trailing spaces in get_array. 31 * <Yves.Arrouye@marin.fdn.fr> 32 * 33 * Jerome Forissier : added per-CPU time information to /proc/stat 34 * and /proc/<pid>/cpu extension 35 * <forissier@isia.cma.fr> 36 * - Incorporation and non-SMP safe operation 37 * of forissier patch in 2.1.78 by 38 * Hans Marcus <crowbar@concepts.nl> 39 * 40 * aeb@cwi.nl : /proc/partitions 41 * 42 * 43 * Alan Cox : security fixes. 44 * <alan@lxorguk.ukuu.org.uk> 45 * 46 * Al Viro : safe handling of mm_struct 47 * 48 * Gerhard Wichert : added BIGMEM support 49 * Siemens AG <Gerhard.Wichert@pdb.siemens.de> 50 * 51 * Al Viro & Jeff Garzik : moved most of the thing into base.c and 52 * : proc_misc.c. The rest may eventually go into 53 * : base.c too. 54 */ 55 56 #include <linux/types.h> 57 #include <linux/errno.h> 58 #include <linux/time.h> 59 #include <linux/kernel.h> 60 #include <linux/kernel_stat.h> 61 #include <linux/tty.h> 62 #include <linux/string.h> 63 #include <linux/mman.h> 64 #include <linux/sched/mm.h> 65 #include <linux/sched/numa_balancing.h> 66 #include <linux/sched/task_stack.h> 67 #include <linux/sched/task.h> 68 #include <linux/sched/cputime.h> 69 #include <linux/proc_fs.h> 70 #include <linux/ioport.h> 71 #include <linux/uaccess.h> 72 #include <linux/io.h> 73 #include <linux/mm.h> 74 #include <linux/hugetlb.h> 75 #include <linux/pagemap.h> 76 #include <linux/swap.h> 77 #include <linux/smp.h> 78 #include <linux/signal.h> 79 #include <linux/highmem.h> 80 #include <linux/file.h> 81 #include <linux/fdtable.h> 82 #include <linux/times.h> 83 #include <linux/cpuset.h> 84 #include <linux/rcupdate.h> 85 #include <linux/delayacct.h> 86 #include <linux/seq_file.h> 87 #include <linux/pid_namespace.h> 88 #include <linux/prctl.h> 89 #include <linux/ptrace.h> 90 #include <linux/tracehook.h> 91 #include <linux/string_helpers.h> 92 #include <linux/user_namespace.h> 93 #include <linux/fs_struct.h> 94 95 #include <asm/pgtable.h> 96 #include <asm/processor.h> 97 #include "internal.h" 98 99 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape) 100 { 101 char *buf; 102 size_t size; 103 char tcomm[64]; 104 int ret; 105 106 if (p->flags & PF_WQ_WORKER) 107 wq_worker_comm(tcomm, sizeof(tcomm), p); 108 else 109 __get_task_comm(tcomm, sizeof(tcomm), p); 110 111 size = seq_get_buf(m, &buf); 112 if (escape) { 113 ret = string_escape_str(tcomm, buf, size, 114 ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 115 if (ret >= size) 116 ret = -1; 117 } else { 118 ret = strscpy(buf, tcomm, size); 119 } 120 121 seq_commit(m, ret); 122 } 123 124 /* 125 * The task state array is a strange "bitmap" of 126 * reasons to sleep. Thus "running" is zero, and 127 * you can test for combinations of others with 128 * simple bit tests. 129 */ 130 static const char * const task_state_array[] = { 131 132 /* states in TASK_REPORT: */ 133 "R (running)", /* 0x00 */ 134 "S (sleeping)", /* 0x01 */ 135 "D (disk sleep)", /* 0x02 */ 136 "T (stopped)", /* 0x04 */ 137 "t (tracing stop)", /* 0x08 */ 138 "X (dead)", /* 0x10 */ 139 "Z (zombie)", /* 0x20 */ 140 "P (parked)", /* 0x40 */ 141 142 /* states beyond TASK_REPORT: */ 143 "I (idle)", /* 0x80 */ 144 }; 145 146 static inline const char *get_task_state(struct task_struct *tsk) 147 { 148 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 149 return task_state_array[task_state_index(tsk)]; 150 } 151 152 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 153 struct pid *pid, struct task_struct *p) 154 { 155 struct user_namespace *user_ns = seq_user_ns(m); 156 struct group_info *group_info; 157 int g, umask = -1; 158 struct task_struct *tracer; 159 const struct cred *cred; 160 pid_t ppid, tpid = 0, tgid, ngid; 161 unsigned int max_fds = 0; 162 163 rcu_read_lock(); 164 ppid = pid_alive(p) ? 165 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 166 167 tracer = ptrace_parent(p); 168 if (tracer) 169 tpid = task_pid_nr_ns(tracer, ns); 170 171 tgid = task_tgid_nr_ns(p, ns); 172 ngid = task_numa_group_id(p); 173 cred = get_task_cred(p); 174 175 task_lock(p); 176 if (p->fs) 177 umask = p->fs->umask; 178 if (p->files) 179 max_fds = files_fdtable(p->files)->max_fds; 180 task_unlock(p); 181 rcu_read_unlock(); 182 183 if (umask >= 0) 184 seq_printf(m, "Umask:\t%#04o\n", umask); 185 seq_puts(m, "State:\t"); 186 seq_puts(m, get_task_state(p)); 187 188 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 189 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 190 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 191 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 192 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 193 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 194 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 195 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 196 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 197 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 198 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 199 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 200 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 201 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 202 203 seq_puts(m, "\nGroups:\t"); 204 group_info = cred->group_info; 205 for (g = 0; g < group_info->ngroups; g++) 206 seq_put_decimal_ull(m, g ? " " : "", 207 from_kgid_munged(user_ns, group_info->gid[g])); 208 put_cred(cred); 209 /* Trailing space shouldn't have been added in the first place. */ 210 seq_putc(m, ' '); 211 212 #ifdef CONFIG_PID_NS 213 seq_puts(m, "\nNStgid:"); 214 for (g = ns->level; g <= pid->level; g++) 215 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 216 seq_puts(m, "\nNSpid:"); 217 for (g = ns->level; g <= pid->level; g++) 218 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 219 seq_puts(m, "\nNSpgid:"); 220 for (g = ns->level; g <= pid->level; g++) 221 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 222 seq_puts(m, "\nNSsid:"); 223 for (g = ns->level; g <= pid->level; g++) 224 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 225 #endif 226 seq_putc(m, '\n'); 227 } 228 229 void render_sigset_t(struct seq_file *m, const char *header, 230 sigset_t *set) 231 { 232 int i; 233 234 seq_puts(m, header); 235 236 i = _NSIG; 237 do { 238 int x = 0; 239 240 i -= 4; 241 if (sigismember(set, i+1)) x |= 1; 242 if (sigismember(set, i+2)) x |= 2; 243 if (sigismember(set, i+3)) x |= 4; 244 if (sigismember(set, i+4)) x |= 8; 245 seq_putc(m, hex_asc[x]); 246 } while (i >= 4); 247 248 seq_putc(m, '\n'); 249 } 250 251 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 252 sigset_t *catch) 253 { 254 struct k_sigaction *k; 255 int i; 256 257 k = p->sighand->action; 258 for (i = 1; i <= _NSIG; ++i, ++k) { 259 if (k->sa.sa_handler == SIG_IGN) 260 sigaddset(ign, i); 261 else if (k->sa.sa_handler != SIG_DFL) 262 sigaddset(catch, i); 263 } 264 } 265 266 static inline void task_sig(struct seq_file *m, struct task_struct *p) 267 { 268 unsigned long flags; 269 sigset_t pending, shpending, blocked, ignored, caught; 270 int num_threads = 0; 271 unsigned int qsize = 0; 272 unsigned long qlim = 0; 273 274 sigemptyset(&pending); 275 sigemptyset(&shpending); 276 sigemptyset(&blocked); 277 sigemptyset(&ignored); 278 sigemptyset(&caught); 279 280 if (lock_task_sighand(p, &flags)) { 281 pending = p->pending.signal; 282 shpending = p->signal->shared_pending.signal; 283 blocked = p->blocked; 284 collect_sigign_sigcatch(p, &ignored, &caught); 285 num_threads = get_nr_threads(p); 286 rcu_read_lock(); /* FIXME: is this correct? */ 287 qsize = atomic_read(&__task_cred(p)->user->sigpending); 288 rcu_read_unlock(); 289 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 290 unlock_task_sighand(p, &flags); 291 } 292 293 seq_put_decimal_ull(m, "Threads:\t", num_threads); 294 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 295 seq_put_decimal_ull(m, "/", qlim); 296 297 /* render them all */ 298 render_sigset_t(m, "\nSigPnd:\t", &pending); 299 render_sigset_t(m, "ShdPnd:\t", &shpending); 300 render_sigset_t(m, "SigBlk:\t", &blocked); 301 render_sigset_t(m, "SigIgn:\t", &ignored); 302 render_sigset_t(m, "SigCgt:\t", &caught); 303 } 304 305 static void render_cap_t(struct seq_file *m, const char *header, 306 kernel_cap_t *a) 307 { 308 unsigned __capi; 309 310 seq_puts(m, header); 311 CAP_FOR_EACH_U32(__capi) { 312 seq_put_hex_ll(m, NULL, 313 a->cap[CAP_LAST_U32 - __capi], 8); 314 } 315 seq_putc(m, '\n'); 316 } 317 318 static inline void task_cap(struct seq_file *m, struct task_struct *p) 319 { 320 const struct cred *cred; 321 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 322 cap_bset, cap_ambient; 323 324 rcu_read_lock(); 325 cred = __task_cred(p); 326 cap_inheritable = cred->cap_inheritable; 327 cap_permitted = cred->cap_permitted; 328 cap_effective = cred->cap_effective; 329 cap_bset = cred->cap_bset; 330 cap_ambient = cred->cap_ambient; 331 rcu_read_unlock(); 332 333 render_cap_t(m, "CapInh:\t", &cap_inheritable); 334 render_cap_t(m, "CapPrm:\t", &cap_permitted); 335 render_cap_t(m, "CapEff:\t", &cap_effective); 336 render_cap_t(m, "CapBnd:\t", &cap_bset); 337 render_cap_t(m, "CapAmb:\t", &cap_ambient); 338 } 339 340 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 341 { 342 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 343 #ifdef CONFIG_SECCOMP 344 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 345 #endif 346 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 347 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 348 case -EINVAL: 349 seq_puts(m, "unknown"); 350 break; 351 case PR_SPEC_NOT_AFFECTED: 352 seq_puts(m, "not vulnerable"); 353 break; 354 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 355 seq_puts(m, "thread force mitigated"); 356 break; 357 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 358 seq_puts(m, "thread mitigated"); 359 break; 360 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 361 seq_puts(m, "thread vulnerable"); 362 break; 363 case PR_SPEC_DISABLE: 364 seq_puts(m, "globally mitigated"); 365 break; 366 default: 367 seq_puts(m, "vulnerable"); 368 break; 369 } 370 seq_putc(m, '\n'); 371 } 372 373 static inline void task_context_switch_counts(struct seq_file *m, 374 struct task_struct *p) 375 { 376 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 377 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 378 seq_putc(m, '\n'); 379 } 380 381 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 382 { 383 seq_printf(m, "Cpus_allowed:\t%*pb\n", 384 cpumask_pr_args(task->cpus_ptr)); 385 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 386 cpumask_pr_args(task->cpus_ptr)); 387 } 388 389 static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm) 390 { 391 seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state); 392 seq_putc(m, '\n'); 393 } 394 395 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 396 { 397 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 398 399 if (thp_enabled) 400 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags); 401 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 402 } 403 404 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 405 struct pid *pid, struct task_struct *task) 406 { 407 struct mm_struct *mm = get_task_mm(task); 408 409 seq_puts(m, "Name:\t"); 410 proc_task_name(m, task, true); 411 seq_putc(m, '\n'); 412 413 task_state(m, ns, pid, task); 414 415 if (mm) { 416 task_mem(m, mm); 417 task_core_dumping(m, mm); 418 task_thp_status(m, mm); 419 mmput(mm); 420 } 421 task_sig(m, task); 422 task_cap(m, task); 423 task_seccomp(m, task); 424 task_cpus_allowed(m, task); 425 cpuset_task_status_allowed(m, task); 426 task_context_switch_counts(m, task); 427 return 0; 428 } 429 430 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 431 struct pid *pid, struct task_struct *task, int whole) 432 { 433 unsigned long vsize, eip, esp, wchan = 0; 434 int priority, nice; 435 int tty_pgrp = -1, tty_nr = 0; 436 sigset_t sigign, sigcatch; 437 char state; 438 pid_t ppid = 0, pgid = -1, sid = -1; 439 int num_threads = 0; 440 int permitted; 441 struct mm_struct *mm; 442 unsigned long long start_time; 443 unsigned long cmin_flt = 0, cmaj_flt = 0; 444 unsigned long min_flt = 0, maj_flt = 0; 445 u64 cutime, cstime, utime, stime; 446 u64 cgtime, gtime; 447 unsigned long rsslim = 0; 448 unsigned long flags; 449 450 state = *get_task_state(task); 451 vsize = eip = esp = 0; 452 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 453 mm = get_task_mm(task); 454 if (mm) { 455 vsize = task_vsize(mm); 456 /* 457 * esp and eip are intentionally zeroed out. There is no 458 * non-racy way to read them without freezing the task. 459 * Programs that need reliable values can use ptrace(2). 460 * 461 * The only exception is if the task is core dumping because 462 * a program is not able to use ptrace(2) in that case. It is 463 * safe because the task has stopped executing permanently. 464 */ 465 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 466 if (try_get_task_stack(task)) { 467 eip = KSTK_EIP(task); 468 esp = KSTK_ESP(task); 469 put_task_stack(task); 470 } 471 } 472 } 473 474 sigemptyset(&sigign); 475 sigemptyset(&sigcatch); 476 cutime = cstime = utime = stime = 0; 477 cgtime = gtime = 0; 478 479 if (lock_task_sighand(task, &flags)) { 480 struct signal_struct *sig = task->signal; 481 482 if (sig->tty) { 483 struct pid *pgrp = tty_get_pgrp(sig->tty); 484 tty_pgrp = pid_nr_ns(pgrp, ns); 485 put_pid(pgrp); 486 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 487 } 488 489 num_threads = get_nr_threads(task); 490 collect_sigign_sigcatch(task, &sigign, &sigcatch); 491 492 cmin_flt = sig->cmin_flt; 493 cmaj_flt = sig->cmaj_flt; 494 cutime = sig->cutime; 495 cstime = sig->cstime; 496 cgtime = sig->cgtime; 497 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 498 499 /* add up live thread stats at the group level */ 500 if (whole) { 501 struct task_struct *t = task; 502 do { 503 min_flt += t->min_flt; 504 maj_flt += t->maj_flt; 505 gtime += task_gtime(t); 506 } while_each_thread(task, t); 507 508 min_flt += sig->min_flt; 509 maj_flt += sig->maj_flt; 510 thread_group_cputime_adjusted(task, &utime, &stime); 511 gtime += sig->gtime; 512 } 513 514 sid = task_session_nr_ns(task, ns); 515 ppid = task_tgid_nr_ns(task->real_parent, ns); 516 pgid = task_pgrp_nr_ns(task, ns); 517 518 unlock_task_sighand(task, &flags); 519 } 520 521 if (permitted && (!whole || num_threads < 2)) 522 wchan = get_wchan(task); 523 if (!whole) { 524 min_flt = task->min_flt; 525 maj_flt = task->maj_flt; 526 task_cputime_adjusted(task, &utime, &stime); 527 gtime = task_gtime(task); 528 } 529 530 /* scale priority and nice values from timeslices to -20..20 */ 531 /* to make it look like a "normal" Unix priority/nice value */ 532 priority = task_prio(task); 533 nice = task_nice(task); 534 535 /* convert nsec -> ticks */ 536 start_time = nsec_to_clock_t(task->start_boottime); 537 538 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 539 seq_puts(m, " ("); 540 proc_task_name(m, task, false); 541 seq_puts(m, ") "); 542 seq_putc(m, state); 543 seq_put_decimal_ll(m, " ", ppid); 544 seq_put_decimal_ll(m, " ", pgid); 545 seq_put_decimal_ll(m, " ", sid); 546 seq_put_decimal_ll(m, " ", tty_nr); 547 seq_put_decimal_ll(m, " ", tty_pgrp); 548 seq_put_decimal_ull(m, " ", task->flags); 549 seq_put_decimal_ull(m, " ", min_flt); 550 seq_put_decimal_ull(m, " ", cmin_flt); 551 seq_put_decimal_ull(m, " ", maj_flt); 552 seq_put_decimal_ull(m, " ", cmaj_flt); 553 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 554 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 555 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 556 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 557 seq_put_decimal_ll(m, " ", priority); 558 seq_put_decimal_ll(m, " ", nice); 559 seq_put_decimal_ll(m, " ", num_threads); 560 seq_put_decimal_ull(m, " ", 0); 561 seq_put_decimal_ull(m, " ", start_time); 562 seq_put_decimal_ull(m, " ", vsize); 563 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 564 seq_put_decimal_ull(m, " ", rsslim); 565 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 566 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 567 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 568 seq_put_decimal_ull(m, " ", esp); 569 seq_put_decimal_ull(m, " ", eip); 570 /* The signal information here is obsolete. 571 * It must be decimal for Linux 2.0 compatibility. 572 * Use /proc/#/status for real-time signals. 573 */ 574 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 575 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 576 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 577 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 578 579 /* 580 * We used to output the absolute kernel address, but that's an 581 * information leak - so instead we show a 0/1 flag here, to signal 582 * to user-space whether there's a wchan field in /proc/PID/wchan. 583 * 584 * This works with older implementations of procps as well. 585 */ 586 if (wchan) 587 seq_puts(m, " 1"); 588 else 589 seq_puts(m, " 0"); 590 591 seq_put_decimal_ull(m, " ", 0); 592 seq_put_decimal_ull(m, " ", 0); 593 seq_put_decimal_ll(m, " ", task->exit_signal); 594 seq_put_decimal_ll(m, " ", task_cpu(task)); 595 seq_put_decimal_ull(m, " ", task->rt_priority); 596 seq_put_decimal_ull(m, " ", task->policy); 597 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 598 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 599 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 600 601 if (mm && permitted) { 602 seq_put_decimal_ull(m, " ", mm->start_data); 603 seq_put_decimal_ull(m, " ", mm->end_data); 604 seq_put_decimal_ull(m, " ", mm->start_brk); 605 seq_put_decimal_ull(m, " ", mm->arg_start); 606 seq_put_decimal_ull(m, " ", mm->arg_end); 607 seq_put_decimal_ull(m, " ", mm->env_start); 608 seq_put_decimal_ull(m, " ", mm->env_end); 609 } else 610 seq_puts(m, " 0 0 0 0 0 0 0"); 611 612 if (permitted) 613 seq_put_decimal_ll(m, " ", task->exit_code); 614 else 615 seq_puts(m, " 0"); 616 617 seq_putc(m, '\n'); 618 if (mm) 619 mmput(mm); 620 return 0; 621 } 622 623 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 624 struct pid *pid, struct task_struct *task) 625 { 626 return do_task_stat(m, ns, pid, task, 0); 627 } 628 629 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 630 struct pid *pid, struct task_struct *task) 631 { 632 return do_task_stat(m, ns, pid, task, 1); 633 } 634 635 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 636 struct pid *pid, struct task_struct *task) 637 { 638 unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0; 639 struct mm_struct *mm = get_task_mm(task); 640 641 if (mm) { 642 size = task_statm(mm, &shared, &text, &data, &resident); 643 mmput(mm); 644 } 645 /* 646 * For quick read, open code by putting numbers directly 647 * expected format is 648 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 649 * size, resident, shared, text, data); 650 */ 651 seq_put_decimal_ull(m, "", size); 652 seq_put_decimal_ull(m, " ", resident); 653 seq_put_decimal_ull(m, " ", shared); 654 seq_put_decimal_ull(m, " ", text); 655 seq_put_decimal_ull(m, " ", 0); 656 seq_put_decimal_ull(m, " ", data); 657 seq_put_decimal_ull(m, " ", 0); 658 seq_putc(m, '\n'); 659 660 return 0; 661 } 662 663 #ifdef CONFIG_PROC_CHILDREN 664 static struct pid * 665 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 666 { 667 struct task_struct *start, *task; 668 struct pid *pid = NULL; 669 670 read_lock(&tasklist_lock); 671 672 start = pid_task(proc_pid(inode), PIDTYPE_PID); 673 if (!start) 674 goto out; 675 676 /* 677 * Lets try to continue searching first, this gives 678 * us significant speedup on children-rich processes. 679 */ 680 if (pid_prev) { 681 task = pid_task(pid_prev, PIDTYPE_PID); 682 if (task && task->real_parent == start && 683 !(list_empty(&task->sibling))) { 684 if (list_is_last(&task->sibling, &start->children)) 685 goto out; 686 task = list_first_entry(&task->sibling, 687 struct task_struct, sibling); 688 pid = get_pid(task_pid(task)); 689 goto out; 690 } 691 } 692 693 /* 694 * Slow search case. 695 * 696 * We might miss some children here if children 697 * are exited while we were not holding the lock, 698 * but it was never promised to be accurate that 699 * much. 700 * 701 * "Just suppose that the parent sleeps, but N children 702 * exit after we printed their tids. Now the slow paths 703 * skips N extra children, we miss N tasks." (c) 704 * 705 * So one need to stop or freeze the leader and all 706 * its children to get a precise result. 707 */ 708 list_for_each_entry(task, &start->children, sibling) { 709 if (pos-- == 0) { 710 pid = get_pid(task_pid(task)); 711 break; 712 } 713 } 714 715 out: 716 read_unlock(&tasklist_lock); 717 return pid; 718 } 719 720 static int children_seq_show(struct seq_file *seq, void *v) 721 { 722 struct inode *inode = file_inode(seq->file); 723 724 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode))); 725 return 0; 726 } 727 728 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 729 { 730 return get_children_pid(file_inode(seq->file), NULL, *pos); 731 } 732 733 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 734 { 735 struct pid *pid; 736 737 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 738 put_pid(v); 739 740 ++*pos; 741 return pid; 742 } 743 744 static void children_seq_stop(struct seq_file *seq, void *v) 745 { 746 put_pid(v); 747 } 748 749 static const struct seq_operations children_seq_ops = { 750 .start = children_seq_start, 751 .next = children_seq_next, 752 .stop = children_seq_stop, 753 .show = children_seq_show, 754 }; 755 756 static int children_seq_open(struct inode *inode, struct file *file) 757 { 758 return seq_open(file, &children_seq_ops); 759 } 760 761 const struct file_operations proc_tid_children_operations = { 762 .open = children_seq_open, 763 .read = seq_read, 764 .llseek = seq_lseek, 765 .release = seq_release, 766 }; 767 #endif /* CONFIG_PROC_CHILDREN */ 768