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