FILE
array.c
File preview with syntax highlighting.
linux-6.19.14/fs/proc/array.c
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/time_namespace.h> 60#include <linux/kernel.h> 61#include <linux/kernel_stat.h> 62#include <linux/tty.h> 63#include <linux/string.h> 64#include <linux/mman.h> 65#include <linux/sched/mm.h> 66#include <linux/sched/numa_balancing.h> 67#include <linux/sched/task_stack.h> 68#include <linux/sched/task.h> 69#include <linux/sched/cputime.h> 70#include <linux/proc_fs.h> 71#include <linux/ioport.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/string_helpers.h> 91#include <linux/user_namespace.h> 92#include <linux/fs_struct.h> 93#include <linux/kthread.h> 94#include <linux/mmu_context.h> 95 96#include <asm/processor.h> 97#include "internal.h" 98 99void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape) 100{ 101 char tcomm[64]; 102 103 /* 104 * Test before PF_KTHREAD because all workqueue worker threads are 105 * kernel threads. 106 */ 107 if (p->flags & PF_WQ_WORKER) 108 wq_worker_comm(tcomm, sizeof(tcomm), p); 109 else if (p->flags & PF_KTHREAD) 110 get_kthread_comm(tcomm, sizeof(tcomm), p); 111 else 112 get_task_comm(tcomm, p); 113 114 if (escape) 115 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 116 else 117 seq_printf(m, "%.64s", tcomm); 118} 119 120/* 121 * The task state array is a strange "bitmap" of 122 * reasons to sleep. Thus "running" is zero, and 123 * you can test for combinations of others with 124 * simple bit tests. 125 */ 126static const char * const task_state_array[] = { 127 128 /* states in TASK_REPORT: */ 129 "R (running)", /* 0x00 */ 130 "S (sleeping)", /* 0x01 */ 131 "D (disk sleep)", /* 0x02 */ 132 "T (stopped)", /* 0x04 */ 133 "t (tracing stop)", /* 0x08 */ 134 "X (dead)", /* 0x10 */ 135 "Z (zombie)", /* 0x20 */ 136 "P (parked)", /* 0x40 */ 137 138 /* states beyond TASK_REPORT: */ 139 "I (idle)", /* 0x80 */ 140}; 141 142static inline const char *get_task_state(struct task_struct *tsk) 143{ 144 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 145 return task_state_array[task_state_index(tsk)]; 146} 147 148static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 149 struct pid *pid, struct task_struct *p) 150{ 151 struct user_namespace *user_ns = seq_user_ns(m); 152 struct group_info *group_info; 153 int g, umask = -1; 154 struct task_struct *tracer; 155 const struct cred *cred; 156 pid_t ppid, tpid = 0, tgid, ngid; 157 unsigned int max_fds = 0; 158 159 rcu_read_lock(); 160 tracer = ptrace_parent(p); 161 if (tracer) 162 tpid = task_pid_nr_ns(tracer, ns); 163 164 ppid = task_ppid_nr_ns(p, ns); 165 tgid = task_tgid_nr_ns(p, ns); 166 ngid = task_numa_group_id(p); 167 cred = get_task_cred(p); 168 169 task_lock(p); 170 if (p->fs) 171 umask = p->fs->umask; 172 if (p->files) 173 max_fds = files_fdtable(p->files)->max_fds; 174 task_unlock(p); 175 rcu_read_unlock(); 176 177 if (umask >= 0) 178 seq_printf(m, "Umask:\t%#04o\n", umask); 179 seq_puts(m, "State:\t"); 180 seq_puts(m, get_task_state(p)); 181 182 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 183 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 184 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 185 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 186 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 187 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 188 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 189 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 190 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 191 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 192 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 193 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 194 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 195 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 196 197 seq_puts(m, "\nGroups:\t"); 198 group_info = cred->group_info; 199 for (g = 0; g < group_info->ngroups; g++) 200 seq_put_decimal_ull(m, g ? " " : "", 201 from_kgid_munged(user_ns, group_info->gid[g])); 202 put_cred(cred); 203 /* Trailing space shouldn't have been added in the first place. */ 204 seq_putc(m, ' '); 205 206#ifdef CONFIG_PID_NS 207 seq_puts(m, "\nNStgid:"); 208 for (g = ns->level; g <= pid->level; g++) 209 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 210 seq_puts(m, "\nNSpid:"); 211 for (g = ns->level; g <= pid->level; g++) 212 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 213 seq_puts(m, "\nNSpgid:"); 214 for (g = ns->level; g <= pid->level; g++) 215 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 216 seq_puts(m, "\nNSsid:"); 217 for (g = ns->level; g <= pid->level; g++) 218 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 219#endif 220 seq_putc(m, '\n'); 221 222 seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0'); 223} 224 225void render_sigset_t(struct seq_file *m, const char *header, 226 sigset_t *set) 227{ 228 int i; 229 230 seq_puts(m, header); 231 232 i = _NSIG; 233 do { 234 int x = 0; 235 236 i -= 4; 237 if (sigismember(set, i+1)) x |= 1; 238 if (sigismember(set, i+2)) x |= 2; 239 if (sigismember(set, i+3)) x |= 4; 240 if (sigismember(set, i+4)) x |= 8; 241 seq_putc(m, hex_asc[x]); 242 } while (i >= 4); 243 244 seq_putc(m, '\n'); 245} 246 247static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 248 sigset_t *sigcatch) 249{ 250 struct k_sigaction *k; 251 int i; 252 253 k = p->sighand->action; 254 for (i = 1; i <= _NSIG; ++i, ++k) { 255 if (k->sa.sa_handler == SIG_IGN) 256 sigaddset(sigign, i); 257 else if (k->sa.sa_handler != SIG_DFL) 258 sigaddset(sigcatch, i); 259 } 260} 261 262static inline void task_sig(struct seq_file *m, struct task_struct *p) 263{ 264 unsigned long flags; 265 sigset_t pending, shpending, blocked, ignored, caught; 266 int num_threads = 0; 267 unsigned int qsize = 0; 268 unsigned long qlim = 0; 269 270 sigemptyset(&pending); 271 sigemptyset(&shpending); 272 sigemptyset(&blocked); 273 sigemptyset(&ignored); 274 sigemptyset(&caught); 275 276 if (lock_task_sighand(p, &flags)) { 277 pending = p->pending.signal; 278 shpending = p->signal->shared_pending.signal; 279 blocked = p->blocked; 280 collect_sigign_sigcatch(p, &ignored, &caught); 281 num_threads = get_nr_threads(p); 282 rcu_read_lock(); /* FIXME: is this correct? */ 283 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 284 rcu_read_unlock(); 285 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 286 unlock_task_sighand(p, &flags); 287 } 288 289 seq_put_decimal_ull(m, "Threads:\t", num_threads); 290 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 291 seq_put_decimal_ull(m, "/", qlim); 292 293 /* render them all */ 294 render_sigset_t(m, "\nSigPnd:\t", &pending); 295 render_sigset_t(m, "ShdPnd:\t", &shpending); 296 render_sigset_t(m, "SigBlk:\t", &blocked); 297 render_sigset_t(m, "SigIgn:\t", &ignored); 298 render_sigset_t(m, "SigCgt:\t", &caught); 299} 300 301static void render_cap_t(struct seq_file *m, const char *header, 302 kernel_cap_t *a) 303{ 304 seq_puts(m, header); 305 seq_put_hex_ll(m, NULL, a->val, 16); 306 seq_putc(m, '\n'); 307} 308 309static inline void task_cap(struct seq_file *m, struct task_struct *p) 310{ 311 const struct cred *cred; 312 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 313 cap_bset, cap_ambient; 314 315 rcu_read_lock(); 316 cred = __task_cred(p); 317 cap_inheritable = cred->cap_inheritable; 318 cap_permitted = cred->cap_permitted; 319 cap_effective = cred->cap_effective; 320 cap_bset = cred->cap_bset; 321 cap_ambient = cred->cap_ambient; 322 rcu_read_unlock(); 323 324 render_cap_t(m, "CapInh:\t", &cap_inheritable); 325 render_cap_t(m, "CapPrm:\t", &cap_permitted); 326 render_cap_t(m, "CapEff:\t", &cap_effective); 327 render_cap_t(m, "CapBnd:\t", &cap_bset); 328 render_cap_t(m, "CapAmb:\t", &cap_ambient); 329} 330 331static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 332{ 333 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 334#ifdef CONFIG_SECCOMP 335 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 336#ifdef CONFIG_SECCOMP_FILTER 337 seq_put_decimal_ull(m, "\nSeccomp_filters:\t", 338 atomic_read(&p->seccomp.filter_count)); 339#endif 340#endif 341 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 342 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 343 case -EINVAL: 344 seq_puts(m, "unknown"); 345 break; 346 case PR_SPEC_NOT_AFFECTED: 347 seq_puts(m, "not vulnerable"); 348 break; 349 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 350 seq_puts(m, "thread force mitigated"); 351 break; 352 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 353 seq_puts(m, "thread mitigated"); 354 break; 355 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 356 seq_puts(m, "thread vulnerable"); 357 break; 358 case PR_SPEC_DISABLE: 359 seq_puts(m, "globally mitigated"); 360 break; 361 default: 362 seq_puts(m, "vulnerable"); 363 break; 364 } 365 366 seq_puts(m, "\nSpeculationIndirectBranch:\t"); 367 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) { 368 case -EINVAL: 369 seq_puts(m, "unsupported"); 370 break; 371 case PR_SPEC_NOT_AFFECTED: 372 seq_puts(m, "not affected"); 373 break; 374 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 375 seq_puts(m, "conditional force disabled"); 376 break; 377 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 378 seq_puts(m, "conditional disabled"); 379 break; 380 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 381 seq_puts(m, "conditional enabled"); 382 break; 383 case PR_SPEC_ENABLE: 384 seq_puts(m, "always enabled"); 385 break; 386 case PR_SPEC_DISABLE: 387 seq_puts(m, "always disabled"); 388 break; 389 default: 390 seq_puts(m, "unknown"); 391 break; 392 } 393 seq_putc(m, '\n'); 394} 395 396static inline void task_context_switch_counts(struct seq_file *m, 397 struct task_struct *p) 398{ 399 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 400 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 401 seq_putc(m, '\n'); 402} 403 404static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 405{ 406 seq_printf(m, "Cpus_allowed:\t%*pb\n", 407 cpumask_pr_args(&task->cpus_mask)); 408 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 409 cpumask_pr_args(&task->cpus_mask)); 410} 411 412static inline void task_core_dumping(struct seq_file *m, struct task_struct *task) 413{ 414 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state); 415 seq_putc(m, '\n'); 416} 417 418static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 419{ 420 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 421 422 if (thp_enabled) 423 thp_enabled = !mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm); 424 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 425} 426 427static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm) 428{ 429 seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm)); 430} 431 432__weak void arch_proc_pid_thread_features(struct seq_file *m, 433 struct task_struct *task) 434{ 435} 436 437int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 438 struct pid *pid, struct task_struct *task) 439{ 440 struct mm_struct *mm = get_task_mm(task); 441 442 seq_puts(m, "Name:\t"); 443 proc_task_name(m, task, true); 444 seq_putc(m, '\n'); 445 446 task_state(m, ns, pid, task); 447 448 if (mm) { 449 task_mem(m, mm); 450 task_core_dumping(m, task); 451 task_thp_status(m, mm); 452 task_untag_mask(m, mm); 453 mmput(mm); 454 } 455 task_sig(m, task); 456 task_cap(m, task); 457 task_seccomp(m, task); 458 task_cpus_allowed(m, task); 459 cpuset_task_status_allowed(m, task); 460 task_context_switch_counts(m, task); 461 arch_proc_pid_thread_features(m, task); 462 return 0; 463} 464 465static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 466 struct pid *pid, struct task_struct *task, int whole) 467{ 468 unsigned long vsize, eip, esp, wchan = 0; 469 int priority, nice; 470 int tty_pgrp = -1, tty_nr = 0; 471 sigset_t sigign, sigcatch; 472 char state; 473 pid_t ppid = 0, pgid = -1, sid = -1; 474 int num_threads = 0; 475 int permitted; 476 struct mm_struct *mm; 477 unsigned long long start_time; 478 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt; 479 u64 cutime, cstime, cgtime, utime, stime, gtime; 480 unsigned long rsslim = 0; 481 unsigned long flags; 482 int exit_code = task->exit_code; 483 struct signal_struct *sig = task->signal; 484 485 state = *get_task_state(task); 486 vsize = eip = esp = 0; 487 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 488 mm = get_task_mm(task); 489 if (mm) { 490 vsize = task_vsize(mm); 491 /* 492 * esp and eip are intentionally zeroed out. There is no 493 * non-racy way to read them without freezing the task. 494 * Programs that need reliable values can use ptrace(2). 495 * 496 * The only exception is if the task is core dumping because 497 * a program is not able to use ptrace(2) in that case. It is 498 * safe because the task has stopped executing permanently. 499 */ 500 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE|PF_POSTCOREDUMP))) { 501 if (try_get_task_stack(task)) { 502 eip = KSTK_EIP(task); 503 esp = KSTK_ESP(task); 504 put_task_stack(task); 505 } 506 } 507 } 508 509 sigemptyset(&sigign); 510 sigemptyset(&sigcatch); 511 512 if (lock_task_sighand(task, &flags)) { 513 if (sig->tty) { 514 struct pid *pgrp = tty_get_pgrp(sig->tty); 515 tty_pgrp = pid_nr_ns(pgrp, ns); 516 put_pid(pgrp); 517 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 518 } 519 520 num_threads = get_nr_threads(task); 521 collect_sigign_sigcatch(task, &sigign, &sigcatch); 522 523 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 524 525 if (whole) { 526 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 527 exit_code = sig->group_exit_code; 528 } 529 530 sid = task_session_nr_ns(task, ns); 531 ppid = task_ppid_nr_ns(task, ns); 532 pgid = task_pgrp_nr_ns(task, ns); 533 534 unlock_task_sighand(task, &flags); 535 } 536 537 if (permitted && (!whole || num_threads < 2)) 538 wchan = !task_is_running(task); 539 540 scoped_guard(rcu) { 541 scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) { 542 cmin_flt = sig->cmin_flt; 543 cmaj_flt = sig->cmaj_flt; 544 cutime = sig->cutime; 545 cstime = sig->cstime; 546 cgtime = sig->cgtime; 547 548 if (whole) { 549 struct task_struct *t; 550 551 min_flt = sig->min_flt; 552 maj_flt = sig->maj_flt; 553 gtime = sig->gtime; 554 555 __for_each_thread(sig, t) { 556 min_flt += t->min_flt; 557 maj_flt += t->maj_flt; 558 gtime += task_gtime(t); 559 } 560 } 561 } 562 } 563 564 if (whole) { 565 thread_group_cputime_adjusted(task, &utime, &stime); 566 } else { 567 task_cputime_adjusted(task, &utime, &stime); 568 min_flt = task->min_flt; 569 maj_flt = task->maj_flt; 570 gtime = task_gtime(task); 571 } 572 573 /* scale priority and nice values from timeslices to -20..20 */ 574 /* to make it look like a "normal" Unix priority/nice value */ 575 priority = task_prio(task); 576 nice = task_nice(task); 577 578 /* apply timens offset for boottime and convert nsec -> ticks */ 579 start_time = 580 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 581 582 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 583 seq_puts(m, " ("); 584 proc_task_name(m, task, false); 585 seq_puts(m, ") "); 586 seq_putc(m, state); 587 seq_put_decimal_ll(m, " ", ppid); 588 seq_put_decimal_ll(m, " ", pgid); 589 seq_put_decimal_ll(m, " ", sid); 590 seq_put_decimal_ll(m, " ", tty_nr); 591 seq_put_decimal_ll(m, " ", tty_pgrp); 592 seq_put_decimal_ull(m, " ", task->flags); 593 seq_put_decimal_ull(m, " ", min_flt); 594 seq_put_decimal_ull(m, " ", cmin_flt); 595 seq_put_decimal_ull(m, " ", maj_flt); 596 seq_put_decimal_ull(m, " ", cmaj_flt); 597 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 598 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 599 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 600 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 601 seq_put_decimal_ll(m, " ", priority); 602 seq_put_decimal_ll(m, " ", nice); 603 seq_put_decimal_ll(m, " ", num_threads); 604 seq_put_decimal_ull(m, " ", 0); 605 seq_put_decimal_ull(m, " ", start_time); 606 seq_put_decimal_ull(m, " ", vsize); 607 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 608 seq_put_decimal_ull(m, " ", rsslim); 609 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 610 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 611 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 612 seq_put_decimal_ull(m, " ", esp); 613 seq_put_decimal_ull(m, " ", eip); 614 /* The signal information here is obsolete. 615 * It must be decimal for Linux 2.0 compatibility. 616 * Use /proc/#/status for real-time signals. 617 */ 618 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 619 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 620 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 621 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 622 623 /* 624 * We used to output the absolute kernel address, but that's an 625 * information leak - so instead we show a 0/1 flag here, to signal 626 * to user-space whether there's a wchan field in /proc/PID/wchan. 627 * 628 * This works with older implementations of procps as well. 629 */ 630 seq_put_decimal_ull(m, " ", wchan); 631 632 seq_put_decimal_ull(m, " ", 0); 633 seq_put_decimal_ull(m, " ", 0); 634 seq_put_decimal_ll(m, " ", task->exit_signal); 635 seq_put_decimal_ll(m, " ", task_cpu(task)); 636 seq_put_decimal_ull(m, " ", task->rt_priority); 637 seq_put_decimal_ull(m, " ", task->policy); 638 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 639 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 640 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 641 642 if (mm && permitted) { 643 seq_put_decimal_ull(m, " ", mm->start_data); 644 seq_put_decimal_ull(m, " ", mm->end_data); 645 seq_put_decimal_ull(m, " ", mm->start_brk); 646 seq_put_decimal_ull(m, " ", mm->arg_start); 647 seq_put_decimal_ull(m, " ", mm->arg_end); 648 seq_put_decimal_ull(m, " ", mm->env_start); 649 seq_put_decimal_ull(m, " ", mm->env_end); 650 } else 651 seq_puts(m, " 0 0 0 0 0 0 0"); 652 653 if (permitted) 654 seq_put_decimal_ll(m, " ", exit_code); 655 else 656 seq_puts(m, " 0"); 657 658 seq_putc(m, '\n'); 659 if (mm) 660 mmput(mm); 661 return 0; 662} 663 664int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 665 struct pid *pid, struct task_struct *task) 666{ 667 return do_task_stat(m, ns, pid, task, 0); 668} 669 670int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 671 struct pid *pid, struct task_struct *task) 672{ 673 return do_task_stat(m, ns, pid, task, 1); 674} 675 676int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 677 struct pid *pid, struct task_struct *task) 678{ 679 struct mm_struct *mm = get_task_mm(task); 680 681 if (mm) { 682 unsigned long size; 683 unsigned long resident = 0; 684 unsigned long shared = 0; 685 unsigned long text = 0; 686 unsigned long data = 0; 687 688 size = task_statm(mm, &shared, &text, &data, &resident); 689 mmput(mm); 690 691 /* 692 * For quick read, open code by putting numbers directly 693 * expected format is 694 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 695 * size, resident, shared, text, data); 696 */ 697 seq_put_decimal_ull(m, "", size); 698 seq_put_decimal_ull(m, " ", resident); 699 seq_put_decimal_ull(m, " ", shared); 700 seq_put_decimal_ull(m, " ", text); 701 seq_put_decimal_ull(m, " ", 0); 702 seq_put_decimal_ull(m, " ", data); 703 seq_put_decimal_ull(m, " ", 0); 704 seq_putc(m, '\n'); 705 } else { 706 seq_write(m, "0 0 0 0 0 0 0\n", 14); 707 } 708 return 0; 709} 710 711#ifdef CONFIG_PROC_CHILDREN 712static struct pid * 713get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 714{ 715 struct task_struct *start, *task; 716 struct pid *pid = NULL; 717 718 read_lock(&tasklist_lock); 719 720 start = pid_task(proc_pid(inode), PIDTYPE_PID); 721 if (!start) 722 goto out; 723 724 /* 725 * Lets try to continue searching first, this gives 726 * us significant speedup on children-rich processes. 727 */ 728 if (pid_prev) { 729 task = pid_task(pid_prev, PIDTYPE_PID); 730 if (task && task->real_parent == start && 731 !(list_empty(&task->sibling))) { 732 if (list_is_last(&task->sibling, &start->children)) 733 goto out; 734 task = list_first_entry(&task->sibling, 735 struct task_struct, sibling); 736 pid = get_pid(task_pid(task)); 737 goto out; 738 } 739 } 740 741 /* 742 * Slow search case. 743 * 744 * We might miss some children here if children 745 * are exited while we were not holding the lock, 746 * but it was never promised to be accurate that 747 * much. 748 * 749 * "Just suppose that the parent sleeps, but N children 750 * exit after we printed their tids. Now the slow paths 751 * skips N extra children, we miss N tasks." (c) 752 * 753 * So one need to stop or freeze the leader and all 754 * its children to get a precise result. 755 */ 756 list_for_each_entry(task, &start->children, sibling) { 757 if (pos-- == 0) { 758 pid = get_pid(task_pid(task)); 759 break; 760 } 761 } 762 763out: 764 read_unlock(&tasklist_lock); 765 return pid; 766} 767 768static int children_seq_show(struct seq_file *seq, void *v) 769{ 770 struct inode *inode = file_inode(seq->file); 771 772 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 773 return 0; 774} 775 776static void *children_seq_start(struct seq_file *seq, loff_t *pos) 777{ 778 return get_children_pid(file_inode(seq->file), NULL, *pos); 779} 780 781static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 782{ 783 struct pid *pid; 784 785 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 786 put_pid(v); 787 788 ++*pos; 789 return pid; 790} 791 792static void children_seq_stop(struct seq_file *seq, void *v) 793{ 794 put_pid(v); 795} 796 797static const struct seq_operations children_seq_ops = { 798 .start = children_seq_start, 799 .next = children_seq_next, 800 .stop = children_seq_stop, 801 .show = children_seq_show, 802}; 803 804static int children_seq_open(struct inode *inode, struct file *file) 805{ 806 return seq_open(file, &children_seq_ops); 807} 808 809const struct file_operations proc_tid_children_operations = { 810 .open = children_seq_open, 811 .read = seq_read, 812 .llseek = seq_lseek, 813 .release = seq_release, 814}; 815#endif /* CONFIG_PROC_CHILDREN */
~/
Read-only file preview.