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 95 #include <asm/processor.h> 96 #include "internal.h" 97 98 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape) 99 { 100 char tcomm[64]; 101 102 /* 103 * Test before PF_KTHREAD because all workqueue worker threads are 104 * kernel threads. 105 */ 106 if (p->flags & PF_WQ_WORKER) 107 wq_worker_comm(tcomm, sizeof(tcomm), p); 108 else if (p->flags & PF_KTHREAD) 109 get_kthread_comm(tcomm, sizeof(tcomm), p); 110 else 111 __get_task_comm(tcomm, sizeof(tcomm), p); 112 113 if (escape) 114 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 115 else 116 seq_printf(m, "%.64s", tcomm); 117 } 118 119 /* 120 * The task state array is a strange "bitmap" of 121 * reasons to sleep. Thus "running" is zero, and 122 * you can test for combinations of others with 123 * simple bit tests. 124 */ 125 static const char * const task_state_array[] = { 126 127 /* states in TASK_REPORT: */ 128 "R (running)", /* 0x00 */ 129 "S (sleeping)", /* 0x01 */ 130 "D (disk sleep)", /* 0x02 */ 131 "T (stopped)", /* 0x04 */ 132 "t (tracing stop)", /* 0x08 */ 133 "X (dead)", /* 0x10 */ 134 "Z (zombie)", /* 0x20 */ 135 "P (parked)", /* 0x40 */ 136 137 /* states beyond TASK_REPORT: */ 138 "I (idle)", /* 0x80 */ 139 }; 140 141 static inline const char *get_task_state(struct task_struct *tsk) 142 { 143 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 144 return task_state_array[task_state_index(tsk)]; 145 } 146 147 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 148 struct pid *pid, struct task_struct *p) 149 { 150 struct user_namespace *user_ns = seq_user_ns(m); 151 struct group_info *group_info; 152 int g, umask = -1; 153 struct task_struct *tracer; 154 const struct cred *cred; 155 pid_t ppid, tpid = 0, tgid, ngid; 156 unsigned int max_fds = 0; 157 158 rcu_read_lock(); 159 ppid = pid_alive(p) ? 160 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 161 162 tracer = ptrace_parent(p); 163 if (tracer) 164 tpid = task_pid_nr_ns(tracer, ns); 165 166 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 } 223 224 void render_sigset_t(struct seq_file *m, const char *header, 225 sigset_t *set) 226 { 227 int i; 228 229 seq_puts(m, header); 230 231 i = _NSIG; 232 do { 233 int x = 0; 234 235 i -= 4; 236 if (sigismember(set, i+1)) x |= 1; 237 if (sigismember(set, i+2)) x |= 2; 238 if (sigismember(set, i+3)) x |= 4; 239 if (sigismember(set, i+4)) x |= 8; 240 seq_putc(m, hex_asc[x]); 241 } while (i >= 4); 242 243 seq_putc(m, '\n'); 244 } 245 246 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 247 sigset_t *sigcatch) 248 { 249 struct k_sigaction *k; 250 int i; 251 252 k = p->sighand->action; 253 for (i = 1; i <= _NSIG; ++i, ++k) { 254 if (k->sa.sa_handler == SIG_IGN) 255 sigaddset(sigign, i); 256 else if (k->sa.sa_handler != SIG_DFL) 257 sigaddset(sigcatch, i); 258 } 259 } 260 261 static inline void task_sig(struct seq_file *m, struct task_struct *p) 262 { 263 unsigned long flags; 264 sigset_t pending, shpending, blocked, ignored, caught; 265 int num_threads = 0; 266 unsigned int qsize = 0; 267 unsigned long qlim = 0; 268 269 sigemptyset(&pending); 270 sigemptyset(&shpending); 271 sigemptyset(&blocked); 272 sigemptyset(&ignored); 273 sigemptyset(&caught); 274 275 if (lock_task_sighand(p, &flags)) { 276 pending = p->pending.signal; 277 shpending = p->signal->shared_pending.signal; 278 blocked = p->blocked; 279 collect_sigign_sigcatch(p, &ignored, &caught); 280 num_threads = get_nr_threads(p); 281 rcu_read_lock(); /* FIXME: is this correct? */ 282 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 283 rcu_read_unlock(); 284 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 285 unlock_task_sighand(p, &flags); 286 } 287 288 seq_put_decimal_ull(m, "Threads:\t", num_threads); 289 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 290 seq_put_decimal_ull(m, "/", qlim); 291 292 /* render them all */ 293 render_sigset_t(m, "\nSigPnd:\t", &pending); 294 render_sigset_t(m, "ShdPnd:\t", &shpending); 295 render_sigset_t(m, "SigBlk:\t", &blocked); 296 render_sigset_t(m, "SigIgn:\t", &ignored); 297 render_sigset_t(m, "SigCgt:\t", &caught); 298 } 299 300 static void render_cap_t(struct seq_file *m, const char *header, 301 kernel_cap_t *a) 302 { 303 unsigned __capi; 304 305 seq_puts(m, header); 306 CAP_FOR_EACH_U32(__capi) { 307 seq_put_hex_ll(m, NULL, 308 a->cap[CAP_LAST_U32 - __capi], 8); 309 } 310 seq_putc(m, '\n'); 311 } 312 313 static inline void task_cap(struct seq_file *m, struct task_struct *p) 314 { 315 const struct cred *cred; 316 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 317 cap_bset, cap_ambient; 318 319 rcu_read_lock(); 320 cred = __task_cred(p); 321 cap_inheritable = cred->cap_inheritable; 322 cap_permitted = cred->cap_permitted; 323 cap_effective = cred->cap_effective; 324 cap_bset = cred->cap_bset; 325 cap_ambient = cred->cap_ambient; 326 rcu_read_unlock(); 327 328 render_cap_t(m, "CapInh:\t", &cap_inheritable); 329 render_cap_t(m, "CapPrm:\t", &cap_permitted); 330 render_cap_t(m, "CapEff:\t", &cap_effective); 331 render_cap_t(m, "CapBnd:\t", &cap_bset); 332 render_cap_t(m, "CapAmb:\t", &cap_ambient); 333 } 334 335 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 336 { 337 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 338 #ifdef CONFIG_SECCOMP 339 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 340 #ifdef CONFIG_SECCOMP_FILTER 341 seq_put_decimal_ull(m, "\nSeccomp_filters:\t", 342 atomic_read(&p->seccomp.filter_count)); 343 #endif 344 #endif 345 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 346 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 347 case -EINVAL: 348 seq_puts(m, "unknown"); 349 break; 350 case PR_SPEC_NOT_AFFECTED: 351 seq_puts(m, "not vulnerable"); 352 break; 353 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 354 seq_puts(m, "thread force mitigated"); 355 break; 356 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 357 seq_puts(m, "thread mitigated"); 358 break; 359 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 360 seq_puts(m, "thread vulnerable"); 361 break; 362 case PR_SPEC_DISABLE: 363 seq_puts(m, "globally mitigated"); 364 break; 365 default: 366 seq_puts(m, "vulnerable"); 367 break; 368 } 369 370 seq_puts(m, "\nSpeculationIndirectBranch:\t"); 371 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) { 372 case -EINVAL: 373 seq_puts(m, "unsupported"); 374 break; 375 case PR_SPEC_NOT_AFFECTED: 376 seq_puts(m, "not affected"); 377 break; 378 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 379 seq_puts(m, "conditional force disabled"); 380 break; 381 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 382 seq_puts(m, "conditional disabled"); 383 break; 384 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 385 seq_puts(m, "conditional enabled"); 386 break; 387 case PR_SPEC_ENABLE: 388 seq_puts(m, "always enabled"); 389 break; 390 case PR_SPEC_DISABLE: 391 seq_puts(m, "always disabled"); 392 break; 393 default: 394 seq_puts(m, "unknown"); 395 break; 396 } 397 seq_putc(m, '\n'); 398 } 399 400 static inline void task_context_switch_counts(struct seq_file *m, 401 struct task_struct *p) 402 { 403 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 404 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 405 seq_putc(m, '\n'); 406 } 407 408 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 409 { 410 seq_printf(m, "Cpus_allowed:\t%*pb\n", 411 cpumask_pr_args(&task->cpus_mask)); 412 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 413 cpumask_pr_args(&task->cpus_mask)); 414 } 415 416 static inline void task_core_dumping(struct seq_file *m, struct task_struct *task) 417 { 418 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state); 419 seq_putc(m, '\n'); 420 } 421 422 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 423 { 424 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 425 426 if (thp_enabled) 427 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags); 428 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 429 } 430 431 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 432 struct pid *pid, struct task_struct *task) 433 { 434 struct mm_struct *mm = get_task_mm(task); 435 436 seq_puts(m, "Name:\t"); 437 proc_task_name(m, task, true); 438 seq_putc(m, '\n'); 439 440 task_state(m, ns, pid, task); 441 442 if (mm) { 443 task_mem(m, mm); 444 task_core_dumping(m, task); 445 task_thp_status(m, mm); 446 mmput(mm); 447 } 448 task_sig(m, task); 449 task_cap(m, task); 450 task_seccomp(m, task); 451 task_cpus_allowed(m, task); 452 cpuset_task_status_allowed(m, task); 453 task_context_switch_counts(m, task); 454 return 0; 455 } 456 457 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 458 struct pid *pid, struct task_struct *task, int whole) 459 { 460 unsigned long vsize, eip, esp, wchan = 0; 461 int priority, nice; 462 int tty_pgrp = -1, tty_nr = 0; 463 sigset_t sigign, sigcatch; 464 char state; 465 pid_t ppid = 0, pgid = -1, sid = -1; 466 int num_threads = 0; 467 int permitted; 468 struct mm_struct *mm; 469 unsigned long long start_time; 470 unsigned long cmin_flt = 0, cmaj_flt = 0; 471 unsigned long min_flt = 0, maj_flt = 0; 472 u64 cutime, cstime, utime, stime; 473 u64 cgtime, gtime; 474 unsigned long rsslim = 0; 475 unsigned long flags; 476 int exit_code = task->exit_code; 477 478 state = *get_task_state(task); 479 vsize = eip = esp = 0; 480 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 481 mm = get_task_mm(task); 482 if (mm) { 483 vsize = task_vsize(mm); 484 /* 485 * esp and eip are intentionally zeroed out. There is no 486 * non-racy way to read them without freezing the task. 487 * Programs that need reliable values can use ptrace(2). 488 * 489 * The only exception is if the task is core dumping because 490 * a program is not able to use ptrace(2) in that case. It is 491 * safe because the task has stopped executing permanently. 492 */ 493 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 494 if (try_get_task_stack(task)) { 495 eip = KSTK_EIP(task); 496 esp = KSTK_ESP(task); 497 put_task_stack(task); 498 } 499 } 500 } 501 502 sigemptyset(&sigign); 503 sigemptyset(&sigcatch); 504 cutime = cstime = utime = stime = 0; 505 cgtime = gtime = 0; 506 507 if (lock_task_sighand(task, &flags)) { 508 struct signal_struct *sig = task->signal; 509 510 if (sig->tty) { 511 struct pid *pgrp = tty_get_pgrp(sig->tty); 512 tty_pgrp = pid_nr_ns(pgrp, ns); 513 put_pid(pgrp); 514 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 515 } 516 517 num_threads = get_nr_threads(task); 518 collect_sigign_sigcatch(task, &sigign, &sigcatch); 519 520 cmin_flt = sig->cmin_flt; 521 cmaj_flt = sig->cmaj_flt; 522 cutime = sig->cutime; 523 cstime = sig->cstime; 524 cgtime = sig->cgtime; 525 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 526 527 /* add up live thread stats at the group level */ 528 if (whole) { 529 struct task_struct *t = task; 530 do { 531 min_flt += t->min_flt; 532 maj_flt += t->maj_flt; 533 gtime += task_gtime(t); 534 } while_each_thread(task, t); 535 536 min_flt += sig->min_flt; 537 maj_flt += sig->maj_flt; 538 thread_group_cputime_adjusted(task, &utime, &stime); 539 gtime += sig->gtime; 540 541 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 542 exit_code = sig->group_exit_code; 543 } 544 545 sid = task_session_nr_ns(task, ns); 546 ppid = task_tgid_nr_ns(task->real_parent, ns); 547 pgid = task_pgrp_nr_ns(task, ns); 548 549 unlock_task_sighand(task, &flags); 550 } 551 552 if (permitted && (!whole || num_threads < 2)) 553 wchan = !task_is_running(task); 554 if (!whole) { 555 min_flt = task->min_flt; 556 maj_flt = task->maj_flt; 557 task_cputime_adjusted(task, &utime, &stime); 558 gtime = task_gtime(task); 559 } 560 561 /* scale priority and nice values from timeslices to -20..20 */ 562 /* to make it look like a "normal" Unix priority/nice value */ 563 priority = task_prio(task); 564 nice = task_nice(task); 565 566 /* apply timens offset for boottime and convert nsec -> ticks */ 567 start_time = 568 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 569 570 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 571 seq_puts(m, " ("); 572 proc_task_name(m, task, false); 573 seq_puts(m, ") "); 574 seq_putc(m, state); 575 seq_put_decimal_ll(m, " ", ppid); 576 seq_put_decimal_ll(m, " ", pgid); 577 seq_put_decimal_ll(m, " ", sid); 578 seq_put_decimal_ll(m, " ", tty_nr); 579 seq_put_decimal_ll(m, " ", tty_pgrp); 580 seq_put_decimal_ull(m, " ", task->flags); 581 seq_put_decimal_ull(m, " ", min_flt); 582 seq_put_decimal_ull(m, " ", cmin_flt); 583 seq_put_decimal_ull(m, " ", maj_flt); 584 seq_put_decimal_ull(m, " ", cmaj_flt); 585 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 586 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 587 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 588 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 589 seq_put_decimal_ll(m, " ", priority); 590 seq_put_decimal_ll(m, " ", nice); 591 seq_put_decimal_ll(m, " ", num_threads); 592 seq_put_decimal_ull(m, " ", 0); 593 seq_put_decimal_ull(m, " ", start_time); 594 seq_put_decimal_ull(m, " ", vsize); 595 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 596 seq_put_decimal_ull(m, " ", rsslim); 597 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 598 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 599 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 600 seq_put_decimal_ull(m, " ", esp); 601 seq_put_decimal_ull(m, " ", eip); 602 /* The signal information here is obsolete. 603 * It must be decimal for Linux 2.0 compatibility. 604 * Use /proc/#/status for real-time signals. 605 */ 606 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 607 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 608 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 609 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 610 611 /* 612 * We used to output the absolute kernel address, but that's an 613 * information leak - so instead we show a 0/1 flag here, to signal 614 * to user-space whether there's a wchan field in /proc/PID/wchan. 615 * 616 * This works with older implementations of procps as well. 617 */ 618 seq_put_decimal_ull(m, " ", wchan); 619 620 seq_put_decimal_ull(m, " ", 0); 621 seq_put_decimal_ull(m, " ", 0); 622 seq_put_decimal_ll(m, " ", task->exit_signal); 623 seq_put_decimal_ll(m, " ", task_cpu(task)); 624 seq_put_decimal_ull(m, " ", task->rt_priority); 625 seq_put_decimal_ull(m, " ", task->policy); 626 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 627 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 628 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 629 630 if (mm && permitted) { 631 seq_put_decimal_ull(m, " ", mm->start_data); 632 seq_put_decimal_ull(m, " ", mm->end_data); 633 seq_put_decimal_ull(m, " ", mm->start_brk); 634 seq_put_decimal_ull(m, " ", mm->arg_start); 635 seq_put_decimal_ull(m, " ", mm->arg_end); 636 seq_put_decimal_ull(m, " ", mm->env_start); 637 seq_put_decimal_ull(m, " ", mm->env_end); 638 } else 639 seq_puts(m, " 0 0 0 0 0 0 0"); 640 641 if (permitted) 642 seq_put_decimal_ll(m, " ", exit_code); 643 else 644 seq_puts(m, " 0"); 645 646 seq_putc(m, '\n'); 647 if (mm) 648 mmput(mm); 649 return 0; 650 } 651 652 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 653 struct pid *pid, struct task_struct *task) 654 { 655 return do_task_stat(m, ns, pid, task, 0); 656 } 657 658 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 659 struct pid *pid, struct task_struct *task) 660 { 661 return do_task_stat(m, ns, pid, task, 1); 662 } 663 664 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 665 struct pid *pid, struct task_struct *task) 666 { 667 struct mm_struct *mm = get_task_mm(task); 668 669 if (mm) { 670 unsigned long size; 671 unsigned long resident = 0; 672 unsigned long shared = 0; 673 unsigned long text = 0; 674 unsigned long data = 0; 675 676 size = task_statm(mm, &shared, &text, &data, &resident); 677 mmput(mm); 678 679 /* 680 * For quick read, open code by putting numbers directly 681 * expected format is 682 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 683 * size, resident, shared, text, data); 684 */ 685 seq_put_decimal_ull(m, "", size); 686 seq_put_decimal_ull(m, " ", resident); 687 seq_put_decimal_ull(m, " ", shared); 688 seq_put_decimal_ull(m, " ", text); 689 seq_put_decimal_ull(m, " ", 0); 690 seq_put_decimal_ull(m, " ", data); 691 seq_put_decimal_ull(m, " ", 0); 692 seq_putc(m, '\n'); 693 } else { 694 seq_write(m, "0 0 0 0 0 0 0\n", 14); 695 } 696 return 0; 697 } 698 699 #ifdef CONFIG_PROC_CHILDREN 700 static struct pid * 701 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 702 { 703 struct task_struct *start, *task; 704 struct pid *pid = NULL; 705 706 read_lock(&tasklist_lock); 707 708 start = pid_task(proc_pid(inode), PIDTYPE_PID); 709 if (!start) 710 goto out; 711 712 /* 713 * Lets try to continue searching first, this gives 714 * us significant speedup on children-rich processes. 715 */ 716 if (pid_prev) { 717 task = pid_task(pid_prev, PIDTYPE_PID); 718 if (task && task->real_parent == start && 719 !(list_empty(&task->sibling))) { 720 if (list_is_last(&task->sibling, &start->children)) 721 goto out; 722 task = list_first_entry(&task->sibling, 723 struct task_struct, sibling); 724 pid = get_pid(task_pid(task)); 725 goto out; 726 } 727 } 728 729 /* 730 * Slow search case. 731 * 732 * We might miss some children here if children 733 * are exited while we were not holding the lock, 734 * but it was never promised to be accurate that 735 * much. 736 * 737 * "Just suppose that the parent sleeps, but N children 738 * exit after we printed their tids. Now the slow paths 739 * skips N extra children, we miss N tasks." (c) 740 * 741 * So one need to stop or freeze the leader and all 742 * its children to get a precise result. 743 */ 744 list_for_each_entry(task, &start->children, sibling) { 745 if (pos-- == 0) { 746 pid = get_pid(task_pid(task)); 747 break; 748 } 749 } 750 751 out: 752 read_unlock(&tasklist_lock); 753 return pid; 754 } 755 756 static int children_seq_show(struct seq_file *seq, void *v) 757 { 758 struct inode *inode = file_inode(seq->file); 759 760 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 761 return 0; 762 } 763 764 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 765 { 766 return get_children_pid(file_inode(seq->file), NULL, *pos); 767 } 768 769 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 770 { 771 struct pid *pid; 772 773 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 774 put_pid(v); 775 776 ++*pos; 777 return pid; 778 } 779 780 static void children_seq_stop(struct seq_file *seq, void *v) 781 { 782 put_pid(v); 783 } 784 785 static const struct seq_operations children_seq_ops = { 786 .start = children_seq_start, 787 .next = children_seq_next, 788 .stop = children_seq_stop, 789 .show = children_seq_show, 790 }; 791 792 static int children_seq_open(struct inode *inode, struct file *file) 793 { 794 return seq_open(file, &children_seq_ops); 795 } 796 797 const struct file_operations proc_tid_children_operations = { 798 .open = children_seq_open, 799 .read = seq_read, 800 .llseek = seq_lseek, 801 .release = seq_release, 802 }; 803 #endif /* CONFIG_PROC_CHILDREN */ 804