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/hex.h> 59 #include <linux/time.h> 60 #include <linux/time_namespace.h> 61 #include <linux/kernel.h> 62 #include <linux/kernel_stat.h> 63 #include <linux/tty.h> 64 #include <linux/string.h> 65 #include <linux/mman.h> 66 #include <linux/sched/mm.h> 67 #include <linux/sched/numa_balancing.h> 68 #include <linux/sched/task_stack.h> 69 #include <linux/sched/task.h> 70 #include <linux/sched/cputime.h> 71 #include <linux/proc_fs.h> 72 #include <linux/ioport.h> 73 #include <linux/io.h> 74 #include <linux/mm.h> 75 #include <linux/hugetlb.h> 76 #include <linux/pagemap.h> 77 #include <linux/swap.h> 78 #include <linux/smp.h> 79 #include <linux/signal.h> 80 #include <linux/highmem.h> 81 #include <linux/file.h> 82 #include <linux/fdtable.h> 83 #include <linux/times.h> 84 #include <linux/cpuset.h> 85 #include <linux/rcupdate.h> 86 #include <linux/delayacct.h> 87 #include <linux/seq_file.h> 88 #include <linux/pid_namespace.h> 89 #include <linux/prctl.h> 90 #include <linux/ptrace.h> 91 #include <linux/string_helpers.h> 92 #include <linux/user_namespace.h> 93 #include <linux/fs_struct.h> 94 #include <linux/kthread.h> 95 #include <linux/mmu_context.h> 96 97 #include <asm/processor.h> 98 #include "internal.h" 99 100 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape) 101 { 102 char tcomm[64]; 103 104 /* 105 * Test before PF_KTHREAD because all workqueue worker threads are 106 * kernel threads. 107 */ 108 if (p->flags & PF_WQ_WORKER) 109 wq_worker_comm(tcomm, sizeof(tcomm), p); 110 else if (p->flags & PF_KTHREAD) 111 get_kthread_comm(tcomm, sizeof(tcomm), p); 112 else 113 get_task_comm(tcomm, p); 114 115 if (escape) 116 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 117 else 118 seq_printf(m, "%.64s", tcomm); 119 } 120 121 /* 122 * The task state array is a strange "bitmap" of 123 * reasons to sleep. Thus "running" is zero, and 124 * you can test for combinations of others with 125 * simple bit tests. 126 */ 127 static const char * const task_state_array[] = { 128 129 /* states in TASK_REPORT: */ 130 "R (running)", /* 0x00 */ 131 "S (sleeping)", /* 0x01 */ 132 "D (disk sleep)", /* 0x02 */ 133 "T (stopped)", /* 0x04 */ 134 "t (tracing stop)", /* 0x08 */ 135 "X (dead)", /* 0x10 */ 136 "Z (zombie)", /* 0x20 */ 137 "P (parked)", /* 0x40 */ 138 139 /* states beyond TASK_REPORT: */ 140 "I (idle)", /* 0x80 */ 141 }; 142 143 static inline const char *get_task_state(struct task_struct *tsk) 144 { 145 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 146 return task_state_array[task_state_index(tsk)]; 147 } 148 149 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 150 struct pid *pid, struct task_struct *p) 151 { 152 struct user_namespace *user_ns = seq_user_ns(m); 153 struct group_info *group_info; 154 int g, umask = -1; 155 struct task_struct *tracer; 156 const struct cred *cred; 157 pid_t ppid, tpid = 0, tgid, ngid; 158 unsigned int max_fds = 0; 159 160 rcu_read_lock(); 161 tracer = ptrace_parent(p); 162 if (tracer) 163 tpid = task_pid_nr_ns(tracer, ns); 164 165 ppid = task_ppid_nr_ns(p, ns); 166 tgid = task_tgid_nr_ns(p, ns); 167 ngid = task_numa_group_id(p); 168 cred = get_task_cred(p); 169 170 task_lock(p); 171 if (p->fs) 172 umask = p->fs->umask; 173 if (p->files) 174 max_fds = files_fdtable(p->files)->max_fds; 175 task_unlock(p); 176 rcu_read_unlock(); 177 178 if (umask >= 0) 179 seq_printf(m, "Umask:\t%#04o\n", umask); 180 seq_puts(m, "State:\t"); 181 seq_puts(m, get_task_state(p)); 182 183 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 184 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 185 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 186 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 187 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 188 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 189 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 190 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 191 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 192 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 193 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 194 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 195 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 196 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 197 198 seq_puts(m, "\nGroups:\t"); 199 group_info = cred->group_info; 200 for (g = 0; g < group_info->ngroups; g++) 201 seq_put_decimal_ull(m, g ? " " : "", 202 from_kgid_munged(user_ns, group_info->gid[g])); 203 put_cred(cred); 204 /* Trailing space shouldn't have been added in the first place. */ 205 seq_putc(m, ' '); 206 207 #ifdef CONFIG_PID_NS 208 seq_puts(m, "\nNStgid:"); 209 for (g = ns->level; g <= pid->level; g++) 210 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 211 seq_puts(m, "\nNSpid:"); 212 for (g = ns->level; g <= pid->level; g++) 213 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 214 seq_puts(m, "\nNSpgid:"); 215 for (g = ns->level; g <= pid->level; g++) 216 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 217 seq_puts(m, "\nNSsid:"); 218 for (g = ns->level; g <= pid->level; g++) 219 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 220 #endif 221 seq_putc(m, '\n'); 222 223 seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0'); 224 } 225 226 void render_sigset_t(struct seq_file *m, const char *header, 227 sigset_t *set) 228 { 229 int i; 230 231 seq_puts(m, header); 232 233 i = _NSIG; 234 do { 235 int x = 0; 236 237 i -= 4; 238 if (sigismember(set, i+1)) x |= 1; 239 if (sigismember(set, i+2)) x |= 2; 240 if (sigismember(set, i+3)) x |= 4; 241 if (sigismember(set, i+4)) x |= 8; 242 seq_putc(m, hex_asc[x]); 243 } while (i >= 4); 244 245 seq_putc(m, '\n'); 246 } 247 248 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 249 sigset_t *sigcatch) 250 { 251 struct k_sigaction *k; 252 int i; 253 254 k = p->sighand->action; 255 for (i = 1; i <= _NSIG; ++i, ++k) { 256 if (k->sa.sa_handler == SIG_IGN) 257 sigaddset(sigign, i); 258 else if (k->sa.sa_handler != SIG_DFL) 259 sigaddset(sigcatch, i); 260 } 261 } 262 263 static inline void task_sig(struct seq_file *m, struct task_struct *p) 264 { 265 unsigned long flags; 266 sigset_t pending, shpending, blocked, ignored, caught; 267 int num_threads = 0; 268 unsigned int qsize = 0; 269 unsigned long qlim = 0; 270 271 sigemptyset(&pending); 272 sigemptyset(&shpending); 273 sigemptyset(&blocked); 274 sigemptyset(&ignored); 275 sigemptyset(&caught); 276 277 if (lock_task_sighand(p, &flags)) { 278 pending = p->pending.signal; 279 shpending = p->signal->shared_pending.signal; 280 blocked = p->blocked; 281 collect_sigign_sigcatch(p, &ignored, &caught); 282 num_threads = get_nr_threads(p); 283 rcu_read_lock(); 284 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 285 rcu_read_unlock(); 286 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 287 unlock_task_sighand(p, &flags); 288 } 289 290 seq_put_decimal_ull(m, "Threads:\t", num_threads); 291 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 292 seq_put_decimal_ull(m, "/", qlim); 293 294 /* render them all */ 295 render_sigset_t(m, "\nSigPnd:\t", &pending); 296 render_sigset_t(m, "ShdPnd:\t", &shpending); 297 render_sigset_t(m, "SigBlk:\t", &blocked); 298 render_sigset_t(m, "SigIgn:\t", &ignored); 299 render_sigset_t(m, "SigCgt:\t", &caught); 300 } 301 302 static void render_cap_t(struct seq_file *m, const char *header, 303 kernel_cap_t *a) 304 { 305 seq_puts(m, header); 306 seq_put_hex_ll(m, NULL, a->val, 16); 307 seq_putc(m, '\n'); 308 } 309 310 static inline void task_cap(struct seq_file *m, struct task_struct *p) 311 { 312 const struct cred *cred; 313 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 314 cap_bset, cap_ambient; 315 316 rcu_read_lock(); 317 cred = __task_cred(p); 318 cap_inheritable = cred->cap_inheritable; 319 cap_permitted = cred->cap_permitted; 320 cap_effective = cred->cap_effective; 321 cap_bset = cred->cap_bset; 322 cap_ambient = cred->cap_ambient; 323 rcu_read_unlock(); 324 325 render_cap_t(m, "CapInh:\t", &cap_inheritable); 326 render_cap_t(m, "CapPrm:\t", &cap_permitted); 327 render_cap_t(m, "CapEff:\t", &cap_effective); 328 render_cap_t(m, "CapBnd:\t", &cap_bset); 329 render_cap_t(m, "CapAmb:\t", &cap_ambient); 330 } 331 332 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 333 { 334 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 335 #ifdef CONFIG_SECCOMP 336 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 337 #ifdef CONFIG_SECCOMP_FILTER 338 seq_put_decimal_ull(m, "\nSeccomp_filters:\t", 339 atomic_read(&p->seccomp.filter_count)); 340 #endif 341 #endif 342 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 343 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 344 case -EINVAL: 345 seq_puts(m, "unknown"); 346 break; 347 case PR_SPEC_NOT_AFFECTED: 348 seq_puts(m, "not vulnerable"); 349 break; 350 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 351 seq_puts(m, "thread force mitigated"); 352 break; 353 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 354 seq_puts(m, "thread mitigated"); 355 break; 356 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 357 seq_puts(m, "thread vulnerable"); 358 break; 359 case PR_SPEC_DISABLE: 360 seq_puts(m, "globally mitigated"); 361 break; 362 default: 363 seq_puts(m, "vulnerable"); 364 break; 365 } 366 367 seq_puts(m, "\nSpeculationIndirectBranch:\t"); 368 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) { 369 case -EINVAL: 370 seq_puts(m, "unsupported"); 371 break; 372 case PR_SPEC_NOT_AFFECTED: 373 seq_puts(m, "not affected"); 374 break; 375 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 376 seq_puts(m, "conditional force disabled"); 377 break; 378 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 379 seq_puts(m, "conditional disabled"); 380 break; 381 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 382 seq_puts(m, "conditional enabled"); 383 break; 384 case PR_SPEC_ENABLE: 385 seq_puts(m, "always enabled"); 386 break; 387 case PR_SPEC_DISABLE: 388 seq_puts(m, "always disabled"); 389 break; 390 default: 391 seq_puts(m, "unknown"); 392 break; 393 } 394 seq_putc(m, '\n'); 395 } 396 397 static inline void task_context_switch_counts(struct seq_file *m, 398 struct task_struct *p) 399 { 400 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 401 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 402 seq_putc(m, '\n'); 403 } 404 405 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 406 { 407 seq_printf(m, "Cpus_allowed:\t%*pb\n", 408 cpumask_pr_args(&task->cpus_mask)); 409 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 410 cpumask_pr_args(&task->cpus_mask)); 411 } 412 413 static inline void task_core_dumping(struct seq_file *m, struct task_struct *task) 414 { 415 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state); 416 seq_putc(m, '\n'); 417 } 418 419 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 420 { 421 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 422 423 if (thp_enabled) 424 thp_enabled = !mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm); 425 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 426 } 427 428 static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm) 429 { 430 seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm)); 431 } 432 433 __weak void arch_proc_pid_thread_features(struct seq_file *m, 434 struct task_struct *task) 435 { 436 } 437 438 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 439 struct pid *pid, struct task_struct *task) 440 { 441 struct mm_struct *mm = get_task_mm(task); 442 443 seq_puts(m, "Name:\t"); 444 proc_task_name(m, task, true); 445 seq_putc(m, '\n'); 446 447 task_state(m, ns, pid, task); 448 449 if (mm) { 450 task_mem(m, mm); 451 task_core_dumping(m, task); 452 task_thp_status(m, mm); 453 task_untag_mask(m, mm); 454 mmput(mm); 455 } 456 task_sig(m, task); 457 task_cap(m, task); 458 task_seccomp(m, task); 459 task_cpus_allowed(m, task); 460 cpuset_task_status_allowed(m, task); 461 task_context_switch_counts(m, task); 462 arch_proc_pid_thread_features(m, task); 463 return 0; 464 } 465 466 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 467 struct pid *pid, struct task_struct *task, int whole) 468 { 469 unsigned long vsize, eip, esp, wchan = 0; 470 int priority, nice; 471 int tty_pgrp = -1, tty_nr = 0; 472 sigset_t sigign, sigcatch; 473 char state; 474 pid_t ppid = 0, pgid = -1, sid = -1; 475 int num_threads = 0; 476 int permitted; 477 struct mm_struct *mm; 478 unsigned long long start_time; 479 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt; 480 u64 cutime, cstime, cgtime, utime, stime, gtime; 481 unsigned long rsslim = 0; 482 unsigned long flags; 483 int exit_code = task->exit_code; 484 struct signal_struct *sig = task->signal; 485 int ret; 486 487 ret = down_read_killable(&task->signal->exec_update_lock); 488 if (ret) 489 return ret; 490 491 state = *get_task_state(task); 492 vsize = eip = esp = 0; 493 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 494 mm = get_task_mm(task); 495 if (mm) { 496 vsize = task_vsize(mm); 497 /* 498 * esp and eip are intentionally zeroed out. There is no 499 * non-racy way to read them without freezing the task. 500 * Programs that need reliable values can use ptrace(2). 501 * 502 * The only exception is if the task is core dumping because 503 * a program is not able to use ptrace(2) in that case. It is 504 * safe because the task has stopped executing permanently. 505 */ 506 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE|PF_POSTCOREDUMP))) { 507 if (try_get_task_stack(task)) { 508 eip = KSTK_EIP(task); 509 esp = KSTK_ESP(task); 510 put_task_stack(task); 511 } 512 } 513 } 514 515 sigemptyset(&sigign); 516 sigemptyset(&sigcatch); 517 518 if (lock_task_sighand(task, &flags)) { 519 if (sig->tty) { 520 struct pid *pgrp = tty_get_pgrp(sig->tty); 521 tty_pgrp = pid_nr_ns(pgrp, ns); 522 put_pid(pgrp); 523 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 524 } 525 526 num_threads = get_nr_threads(task); 527 collect_sigign_sigcatch(task, &sigign, &sigcatch); 528 529 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 530 531 if (whole) { 532 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 533 exit_code = sig->group_exit_code; 534 } 535 536 sid = task_session_nr_ns(task, ns); 537 ppid = task_ppid_nr_ns(task, ns); 538 pgid = task_pgrp_nr_ns(task, ns); 539 540 unlock_task_sighand(task, &flags); 541 } 542 543 if (permitted && (!whole || num_threads < 2)) 544 wchan = !task_is_running(task); 545 546 scoped_guard(rcu) { 547 scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) { 548 cmin_flt = sig->cmin_flt; 549 cmaj_flt = sig->cmaj_flt; 550 cutime = sig->cutime; 551 cstime = sig->cstime; 552 cgtime = sig->cgtime; 553 554 if (whole) { 555 struct task_struct *t; 556 557 min_flt = sig->min_flt; 558 maj_flt = sig->maj_flt; 559 gtime = sig->gtime; 560 561 __for_each_thread(sig, t) { 562 min_flt += t->min_flt; 563 maj_flt += t->maj_flt; 564 gtime += task_gtime(t); 565 } 566 } 567 } 568 } 569 570 if (whole) { 571 thread_group_cputime_adjusted(task, &utime, &stime); 572 } else { 573 task_cputime_adjusted(task, &utime, &stime); 574 min_flt = task->min_flt; 575 maj_flt = task->maj_flt; 576 gtime = task_gtime(task); 577 } 578 579 /* scale priority and nice values from timeslices to -20..20 */ 580 /* to make it look like a "normal" Unix priority/nice value */ 581 priority = task_prio(task); 582 nice = task_nice(task); 583 584 /* apply timens offset for boottime and convert nsec -> ticks */ 585 start_time = 586 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 587 588 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 589 seq_puts(m, " ("); 590 proc_task_name(m, task, false); 591 seq_puts(m, ") "); 592 seq_putc(m, state); 593 seq_put_decimal_ll(m, " ", ppid); 594 seq_put_decimal_ll(m, " ", pgid); 595 seq_put_decimal_ll(m, " ", sid); 596 seq_put_decimal_ll(m, " ", tty_nr); 597 seq_put_decimal_ll(m, " ", tty_pgrp); 598 seq_put_decimal_ull(m, " ", task->flags); 599 seq_put_decimal_ull(m, " ", min_flt); 600 seq_put_decimal_ull(m, " ", cmin_flt); 601 seq_put_decimal_ull(m, " ", maj_flt); 602 seq_put_decimal_ull(m, " ", cmaj_flt); 603 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 604 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 605 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 606 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 607 seq_put_decimal_ll(m, " ", priority); 608 seq_put_decimal_ll(m, " ", nice); 609 seq_put_decimal_ll(m, " ", num_threads); 610 seq_put_decimal_ull(m, " ", 0); 611 seq_put_decimal_ull(m, " ", start_time); 612 seq_put_decimal_ull(m, " ", vsize); 613 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 614 seq_put_decimal_ull(m, " ", rsslim); 615 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 616 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 617 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 618 seq_put_decimal_ull(m, " ", esp); 619 seq_put_decimal_ull(m, " ", eip); 620 /* The signal information here is obsolete. 621 * It must be decimal for Linux 2.0 compatibility. 622 * Use /proc/#/status for real-time signals. 623 */ 624 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 625 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 626 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 627 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 628 629 /* 630 * We used to output the absolute kernel address, but that's an 631 * information leak - so instead we show a 0/1 flag here, to signal 632 * to user-space whether there's a wchan field in /proc/PID/wchan. 633 * 634 * This works with older implementations of procps as well. 635 */ 636 seq_put_decimal_ull(m, " ", wchan); 637 638 seq_put_decimal_ull(m, " ", 0); 639 seq_put_decimal_ull(m, " ", 0); 640 seq_put_decimal_ll(m, " ", task->exit_signal); 641 seq_put_decimal_ll(m, " ", task_cpu(task)); 642 seq_put_decimal_ull(m, " ", task->rt_priority); 643 seq_put_decimal_ull(m, " ", task->policy); 644 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 645 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 646 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 647 648 if (mm && permitted) { 649 seq_put_decimal_ull(m, " ", mm->start_data); 650 seq_put_decimal_ull(m, " ", mm->end_data); 651 seq_put_decimal_ull(m, " ", mm->start_brk); 652 seq_put_decimal_ull(m, " ", mm->arg_start); 653 seq_put_decimal_ull(m, " ", mm->arg_end); 654 seq_put_decimal_ull(m, " ", mm->env_start); 655 seq_put_decimal_ull(m, " ", mm->env_end); 656 } else 657 seq_puts(m, " 0 0 0 0 0 0 0"); 658 659 if (permitted) 660 seq_put_decimal_ll(m, " ", exit_code); 661 else 662 seq_puts(m, " 0"); 663 664 seq_putc(m, '\n'); 665 up_read(&task->signal->exec_update_lock); 666 if (mm) 667 mmput(mm); 668 return 0; 669 } 670 671 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 672 struct pid *pid, struct task_struct *task) 673 { 674 return do_task_stat(m, ns, pid, task, 0); 675 } 676 677 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 678 struct pid *pid, struct task_struct *task) 679 { 680 return do_task_stat(m, ns, pid, task, 1); 681 } 682 683 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 684 struct pid *pid, struct task_struct *task) 685 { 686 struct mm_struct *mm = get_task_mm(task); 687 688 if (mm) { 689 unsigned long size; 690 unsigned long resident = 0; 691 unsigned long shared = 0; 692 unsigned long text = 0; 693 unsigned long data = 0; 694 695 size = task_statm(mm, &shared, &text, &data, &resident); 696 mmput(mm); 697 698 /* 699 * For quick read, open code by putting numbers directly 700 * expected format is 701 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 702 * size, resident, shared, text, data); 703 */ 704 seq_put_decimal_ull(m, "", size); 705 seq_put_decimal_ull(m, " ", resident); 706 seq_put_decimal_ull(m, " ", shared); 707 seq_put_decimal_ull(m, " ", text); 708 seq_put_decimal_ull(m, " ", 0); 709 seq_put_decimal_ull(m, " ", data); 710 seq_put_decimal_ull(m, " ", 0); 711 seq_putc(m, '\n'); 712 } else { 713 seq_write(m, "0 0 0 0 0 0 0\n", 14); 714 } 715 return 0; 716 } 717 718 #ifdef CONFIG_PROC_CHILDREN 719 static struct pid * 720 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 721 { 722 struct task_struct *start, *task; 723 struct pid *pid = NULL; 724 725 read_lock(&tasklist_lock); 726 727 start = pid_task(proc_pid(inode), PIDTYPE_PID); 728 if (!start) 729 goto out; 730 731 /* 732 * Lets try to continue searching first, this gives 733 * us significant speedup on children-rich processes. 734 */ 735 if (pid_prev) { 736 task = pid_task(pid_prev, PIDTYPE_PID); 737 if (task && task->real_parent == start && 738 !(list_empty(&task->sibling))) { 739 if (list_is_last(&task->sibling, &start->children)) 740 goto out; 741 task = list_first_entry(&task->sibling, 742 struct task_struct, sibling); 743 pid = get_pid(task_pid(task)); 744 goto out; 745 } 746 } 747 748 /* 749 * Slow search case. 750 * 751 * We might miss some children here if children 752 * are exited while we were not holding the lock, 753 * but it was never promised to be accurate that 754 * much. 755 * 756 * "Just suppose that the parent sleeps, but N children 757 * exit after we printed their tids. Now the slow paths 758 * skips N extra children, we miss N tasks." (c) 759 * 760 * So one need to stop or freeze the leader and all 761 * its children to get a precise result. 762 */ 763 list_for_each_entry(task, &start->children, sibling) { 764 if (pos-- == 0) { 765 pid = get_pid(task_pid(task)); 766 break; 767 } 768 } 769 770 out: 771 read_unlock(&tasklist_lock); 772 return pid; 773 } 774 775 static int children_seq_show(struct seq_file *seq, void *v) 776 { 777 struct inode *inode = file_inode(seq->file); 778 779 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 780 return 0; 781 } 782 783 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 784 { 785 return get_children_pid(file_inode(seq->file), NULL, *pos); 786 } 787 788 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 789 { 790 struct pid *pid; 791 792 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 793 put_pid(v); 794 795 ++*pos; 796 return pid; 797 } 798 799 static void children_seq_stop(struct seq_file *seq, void *v) 800 { 801 put_pid(v); 802 } 803 804 static const struct seq_operations children_seq_ops = { 805 .start = children_seq_start, 806 .next = children_seq_next, 807 .stop = children_seq_stop, 808 .show = children_seq_show, 809 }; 810 811 static int children_seq_open(struct inode *inode, struct file *file) 812 { 813 return seq_open(file, &children_seq_ops); 814 } 815 816 const struct file_operations proc_tid_children_operations = { 817 .open = children_seq_open, 818 .read = seq_read, 819 .llseek = seq_lseek, 820 .release = seq_release, 821 }; 822 #endif /* CONFIG_PROC_CHILDREN */ 823