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 if (p->flags & PF_WQ_WORKER) 103 wq_worker_comm(tcomm, sizeof(tcomm), p); 104 else if (p->flags & PF_KTHREAD) 105 get_kthread_comm(tcomm, sizeof(tcomm), p); 106 else 107 __get_task_comm(tcomm, sizeof(tcomm), p); 108 109 if (escape) 110 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 111 else 112 seq_printf(m, "%.64s", tcomm); 113 } 114 115 /* 116 * The task state array is a strange "bitmap" of 117 * reasons to sleep. Thus "running" is zero, and 118 * you can test for combinations of others with 119 * simple bit tests. 120 */ 121 static const char * const task_state_array[] = { 122 123 /* states in TASK_REPORT: */ 124 "R (running)", /* 0x00 */ 125 "S (sleeping)", /* 0x01 */ 126 "D (disk sleep)", /* 0x02 */ 127 "T (stopped)", /* 0x04 */ 128 "t (tracing stop)", /* 0x08 */ 129 "X (dead)", /* 0x10 */ 130 "Z (zombie)", /* 0x20 */ 131 "P (parked)", /* 0x40 */ 132 133 /* states beyond TASK_REPORT: */ 134 "I (idle)", /* 0x80 */ 135 }; 136 137 static inline const char *get_task_state(struct task_struct *tsk) 138 { 139 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 140 return task_state_array[task_state_index(tsk)]; 141 } 142 143 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 144 struct pid *pid, struct task_struct *p) 145 { 146 struct user_namespace *user_ns = seq_user_ns(m); 147 struct group_info *group_info; 148 int g, umask = -1; 149 struct task_struct *tracer; 150 const struct cred *cred; 151 pid_t ppid, tpid = 0, tgid, ngid; 152 unsigned int max_fds = 0; 153 154 rcu_read_lock(); 155 ppid = pid_alive(p) ? 156 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 157 158 tracer = ptrace_parent(p); 159 if (tracer) 160 tpid = task_pid_nr_ns(tracer, ns); 161 162 tgid = task_tgid_nr_ns(p, ns); 163 ngid = task_numa_group_id(p); 164 cred = get_task_cred(p); 165 166 task_lock(p); 167 if (p->fs) 168 umask = p->fs->umask; 169 if (p->files) 170 max_fds = files_fdtable(p->files)->max_fds; 171 task_unlock(p); 172 rcu_read_unlock(); 173 174 if (umask >= 0) 175 seq_printf(m, "Umask:\t%#04o\n", umask); 176 seq_puts(m, "State:\t"); 177 seq_puts(m, get_task_state(p)); 178 179 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 180 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 181 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 182 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 183 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 184 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 185 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 186 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 187 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 188 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 189 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 190 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 191 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 192 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 193 194 seq_puts(m, "\nGroups:\t"); 195 group_info = cred->group_info; 196 for (g = 0; g < group_info->ngroups; g++) 197 seq_put_decimal_ull(m, g ? " " : "", 198 from_kgid_munged(user_ns, group_info->gid[g])); 199 put_cred(cred); 200 /* Trailing space shouldn't have been added in the first place. */ 201 seq_putc(m, ' '); 202 203 #ifdef CONFIG_PID_NS 204 seq_puts(m, "\nNStgid:"); 205 for (g = ns->level; g <= pid->level; g++) 206 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 207 seq_puts(m, "\nNSpid:"); 208 for (g = ns->level; g <= pid->level; g++) 209 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 210 seq_puts(m, "\nNSpgid:"); 211 for (g = ns->level; g <= pid->level; g++) 212 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 213 seq_puts(m, "\nNSsid:"); 214 for (g = ns->level; g <= pid->level; g++) 215 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 216 #endif 217 seq_putc(m, '\n'); 218 } 219 220 void render_sigset_t(struct seq_file *m, const char *header, 221 sigset_t *set) 222 { 223 int i; 224 225 seq_puts(m, header); 226 227 i = _NSIG; 228 do { 229 int x = 0; 230 231 i -= 4; 232 if (sigismember(set, i+1)) x |= 1; 233 if (sigismember(set, i+2)) x |= 2; 234 if (sigismember(set, i+3)) x |= 4; 235 if (sigismember(set, i+4)) x |= 8; 236 seq_putc(m, hex_asc[x]); 237 } while (i >= 4); 238 239 seq_putc(m, '\n'); 240 } 241 242 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 243 sigset_t *sigcatch) 244 { 245 struct k_sigaction *k; 246 int i; 247 248 k = p->sighand->action; 249 for (i = 1; i <= _NSIG; ++i, ++k) { 250 if (k->sa.sa_handler == SIG_IGN) 251 sigaddset(sigign, i); 252 else if (k->sa.sa_handler != SIG_DFL) 253 sigaddset(sigcatch, i); 254 } 255 } 256 257 static inline void task_sig(struct seq_file *m, struct task_struct *p) 258 { 259 unsigned long flags; 260 sigset_t pending, shpending, blocked, ignored, caught; 261 int num_threads = 0; 262 unsigned int qsize = 0; 263 unsigned long qlim = 0; 264 265 sigemptyset(&pending); 266 sigemptyset(&shpending); 267 sigemptyset(&blocked); 268 sigemptyset(&ignored); 269 sigemptyset(&caught); 270 271 if (lock_task_sighand(p, &flags)) { 272 pending = p->pending.signal; 273 shpending = p->signal->shared_pending.signal; 274 blocked = p->blocked; 275 collect_sigign_sigcatch(p, &ignored, &caught); 276 num_threads = get_nr_threads(p); 277 rcu_read_lock(); /* FIXME: is this correct? */ 278 qsize = get_ucounts_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 279 rcu_read_unlock(); 280 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 281 unlock_task_sighand(p, &flags); 282 } 283 284 seq_put_decimal_ull(m, "Threads:\t", num_threads); 285 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 286 seq_put_decimal_ull(m, "/", qlim); 287 288 /* render them all */ 289 render_sigset_t(m, "\nSigPnd:\t", &pending); 290 render_sigset_t(m, "ShdPnd:\t", &shpending); 291 render_sigset_t(m, "SigBlk:\t", &blocked); 292 render_sigset_t(m, "SigIgn:\t", &ignored); 293 render_sigset_t(m, "SigCgt:\t", &caught); 294 } 295 296 static void render_cap_t(struct seq_file *m, const char *header, 297 kernel_cap_t *a) 298 { 299 unsigned __capi; 300 301 seq_puts(m, header); 302 CAP_FOR_EACH_U32(__capi) { 303 seq_put_hex_ll(m, NULL, 304 a->cap[CAP_LAST_U32 - __capi], 8); 305 } 306 seq_putc(m, '\n'); 307 } 308 309 static 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 } 330 331 static 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 } 395 396 static 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 } 403 404 static 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 } 411 412 static 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 } 417 418 static 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 = !test_bit(MMF_DISABLE_THP, &mm->flags); 424 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 425 } 426 427 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 428 struct pid *pid, struct task_struct *task) 429 { 430 struct mm_struct *mm = get_task_mm(task); 431 432 seq_puts(m, "Name:\t"); 433 proc_task_name(m, task, true); 434 seq_putc(m, '\n'); 435 436 task_state(m, ns, pid, task); 437 438 if (mm) { 439 task_mem(m, mm); 440 task_core_dumping(m, task); 441 task_thp_status(m, mm); 442 mmput(mm); 443 } 444 task_sig(m, task); 445 task_cap(m, task); 446 task_seccomp(m, task); 447 task_cpus_allowed(m, task); 448 cpuset_task_status_allowed(m, task); 449 task_context_switch_counts(m, task); 450 return 0; 451 } 452 453 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 454 struct pid *pid, struct task_struct *task, int whole) 455 { 456 unsigned long vsize, eip, esp, wchan = 0; 457 int priority, nice; 458 int tty_pgrp = -1, tty_nr = 0; 459 sigset_t sigign, sigcatch; 460 char state; 461 pid_t ppid = 0, pgid = -1, sid = -1; 462 int num_threads = 0; 463 int permitted; 464 struct mm_struct *mm; 465 unsigned long long start_time; 466 unsigned long cmin_flt = 0, cmaj_flt = 0; 467 unsigned long min_flt = 0, maj_flt = 0; 468 u64 cutime, cstime, utime, stime; 469 u64 cgtime, gtime; 470 unsigned long rsslim = 0; 471 unsigned long flags; 472 int exit_code = task->exit_code; 473 474 state = *get_task_state(task); 475 vsize = eip = esp = 0; 476 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 477 mm = get_task_mm(task); 478 if (mm) { 479 vsize = task_vsize(mm); 480 /* 481 * esp and eip are intentionally zeroed out. There is no 482 * non-racy way to read them without freezing the task. 483 * Programs that need reliable values can use ptrace(2). 484 * 485 * The only exception is if the task is core dumping because 486 * a program is not able to use ptrace(2) in that case. It is 487 * safe because the task has stopped executing permanently. 488 */ 489 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 490 if (try_get_task_stack(task)) { 491 eip = KSTK_EIP(task); 492 esp = KSTK_ESP(task); 493 put_task_stack(task); 494 } 495 } 496 } 497 498 sigemptyset(&sigign); 499 sigemptyset(&sigcatch); 500 cutime = cstime = utime = stime = 0; 501 cgtime = gtime = 0; 502 503 if (lock_task_sighand(task, &flags)) { 504 struct signal_struct *sig = task->signal; 505 506 if (sig->tty) { 507 struct pid *pgrp = tty_get_pgrp(sig->tty); 508 tty_pgrp = pid_nr_ns(pgrp, ns); 509 put_pid(pgrp); 510 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 511 } 512 513 num_threads = get_nr_threads(task); 514 collect_sigign_sigcatch(task, &sigign, &sigcatch); 515 516 cmin_flt = sig->cmin_flt; 517 cmaj_flt = sig->cmaj_flt; 518 cutime = sig->cutime; 519 cstime = sig->cstime; 520 cgtime = sig->cgtime; 521 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 522 523 /* add up live thread stats at the group level */ 524 if (whole) { 525 struct task_struct *t = task; 526 do { 527 min_flt += t->min_flt; 528 maj_flt += t->maj_flt; 529 gtime += task_gtime(t); 530 } while_each_thread(task, t); 531 532 min_flt += sig->min_flt; 533 maj_flt += sig->maj_flt; 534 thread_group_cputime_adjusted(task, &utime, &stime); 535 gtime += sig->gtime; 536 537 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 538 exit_code = sig->group_exit_code; 539 } 540 541 sid = task_session_nr_ns(task, ns); 542 ppid = task_tgid_nr_ns(task->real_parent, ns); 543 pgid = task_pgrp_nr_ns(task, ns); 544 545 unlock_task_sighand(task, &flags); 546 } 547 548 if (permitted && (!whole || num_threads < 2)) 549 wchan = !task_is_running(task); 550 if (!whole) { 551 min_flt = task->min_flt; 552 maj_flt = task->maj_flt; 553 task_cputime_adjusted(task, &utime, &stime); 554 gtime = task_gtime(task); 555 } 556 557 /* scale priority and nice values from timeslices to -20..20 */ 558 /* to make it look like a "normal" Unix priority/nice value */ 559 priority = task_prio(task); 560 nice = task_nice(task); 561 562 /* apply timens offset for boottime and convert nsec -> ticks */ 563 start_time = 564 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 565 566 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 567 seq_puts(m, " ("); 568 proc_task_name(m, task, false); 569 seq_puts(m, ") "); 570 seq_putc(m, state); 571 seq_put_decimal_ll(m, " ", ppid); 572 seq_put_decimal_ll(m, " ", pgid); 573 seq_put_decimal_ll(m, " ", sid); 574 seq_put_decimal_ll(m, " ", tty_nr); 575 seq_put_decimal_ll(m, " ", tty_pgrp); 576 seq_put_decimal_ull(m, " ", task->flags); 577 seq_put_decimal_ull(m, " ", min_flt); 578 seq_put_decimal_ull(m, " ", cmin_flt); 579 seq_put_decimal_ull(m, " ", maj_flt); 580 seq_put_decimal_ull(m, " ", cmaj_flt); 581 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 582 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 583 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 584 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 585 seq_put_decimal_ll(m, " ", priority); 586 seq_put_decimal_ll(m, " ", nice); 587 seq_put_decimal_ll(m, " ", num_threads); 588 seq_put_decimal_ull(m, " ", 0); 589 seq_put_decimal_ull(m, " ", start_time); 590 seq_put_decimal_ull(m, " ", vsize); 591 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 592 seq_put_decimal_ull(m, " ", rsslim); 593 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 594 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 595 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 596 seq_put_decimal_ull(m, " ", esp); 597 seq_put_decimal_ull(m, " ", eip); 598 /* The signal information here is obsolete. 599 * It must be decimal for Linux 2.0 compatibility. 600 * Use /proc/#/status for real-time signals. 601 */ 602 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 603 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 604 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 605 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 606 607 /* 608 * We used to output the absolute kernel address, but that's an 609 * information leak - so instead we show a 0/1 flag here, to signal 610 * to user-space whether there's a wchan field in /proc/PID/wchan. 611 * 612 * This works with older implementations of procps as well. 613 */ 614 seq_put_decimal_ull(m, " ", wchan); 615 616 seq_put_decimal_ull(m, " ", 0); 617 seq_put_decimal_ull(m, " ", 0); 618 seq_put_decimal_ll(m, " ", task->exit_signal); 619 seq_put_decimal_ll(m, " ", task_cpu(task)); 620 seq_put_decimal_ull(m, " ", task->rt_priority); 621 seq_put_decimal_ull(m, " ", task->policy); 622 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 623 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 624 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 625 626 if (mm && permitted) { 627 seq_put_decimal_ull(m, " ", mm->start_data); 628 seq_put_decimal_ull(m, " ", mm->end_data); 629 seq_put_decimal_ull(m, " ", mm->start_brk); 630 seq_put_decimal_ull(m, " ", mm->arg_start); 631 seq_put_decimal_ull(m, " ", mm->arg_end); 632 seq_put_decimal_ull(m, " ", mm->env_start); 633 seq_put_decimal_ull(m, " ", mm->env_end); 634 } else 635 seq_puts(m, " 0 0 0 0 0 0 0"); 636 637 if (permitted) 638 seq_put_decimal_ll(m, " ", exit_code); 639 else 640 seq_puts(m, " 0"); 641 642 seq_putc(m, '\n'); 643 if (mm) 644 mmput(mm); 645 return 0; 646 } 647 648 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 649 struct pid *pid, struct task_struct *task) 650 { 651 return do_task_stat(m, ns, pid, task, 0); 652 } 653 654 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 655 struct pid *pid, struct task_struct *task) 656 { 657 return do_task_stat(m, ns, pid, task, 1); 658 } 659 660 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 661 struct pid *pid, struct task_struct *task) 662 { 663 struct mm_struct *mm = get_task_mm(task); 664 665 if (mm) { 666 unsigned long size; 667 unsigned long resident = 0; 668 unsigned long shared = 0; 669 unsigned long text = 0; 670 unsigned long data = 0; 671 672 size = task_statm(mm, &shared, &text, &data, &resident); 673 mmput(mm); 674 675 /* 676 * For quick read, open code by putting numbers directly 677 * expected format is 678 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 679 * size, resident, shared, text, data); 680 */ 681 seq_put_decimal_ull(m, "", size); 682 seq_put_decimal_ull(m, " ", resident); 683 seq_put_decimal_ull(m, " ", shared); 684 seq_put_decimal_ull(m, " ", text); 685 seq_put_decimal_ull(m, " ", 0); 686 seq_put_decimal_ull(m, " ", data); 687 seq_put_decimal_ull(m, " ", 0); 688 seq_putc(m, '\n'); 689 } else { 690 seq_write(m, "0 0 0 0 0 0 0\n", 14); 691 } 692 return 0; 693 } 694 695 #ifdef CONFIG_PROC_CHILDREN 696 static struct pid * 697 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 698 { 699 struct task_struct *start, *task; 700 struct pid *pid = NULL; 701 702 read_lock(&tasklist_lock); 703 704 start = pid_task(proc_pid(inode), PIDTYPE_PID); 705 if (!start) 706 goto out; 707 708 /* 709 * Lets try to continue searching first, this gives 710 * us significant speedup on children-rich processes. 711 */ 712 if (pid_prev) { 713 task = pid_task(pid_prev, PIDTYPE_PID); 714 if (task && task->real_parent == start && 715 !(list_empty(&task->sibling))) { 716 if (list_is_last(&task->sibling, &start->children)) 717 goto out; 718 task = list_first_entry(&task->sibling, 719 struct task_struct, sibling); 720 pid = get_pid(task_pid(task)); 721 goto out; 722 } 723 } 724 725 /* 726 * Slow search case. 727 * 728 * We might miss some children here if children 729 * are exited while we were not holding the lock, 730 * but it was never promised to be accurate that 731 * much. 732 * 733 * "Just suppose that the parent sleeps, but N children 734 * exit after we printed their tids. Now the slow paths 735 * skips N extra children, we miss N tasks." (c) 736 * 737 * So one need to stop or freeze the leader and all 738 * its children to get a precise result. 739 */ 740 list_for_each_entry(task, &start->children, sibling) { 741 if (pos-- == 0) { 742 pid = get_pid(task_pid(task)); 743 break; 744 } 745 } 746 747 out: 748 read_unlock(&tasklist_lock); 749 return pid; 750 } 751 752 static int children_seq_show(struct seq_file *seq, void *v) 753 { 754 struct inode *inode = file_inode(seq->file); 755 756 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 757 return 0; 758 } 759 760 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 761 { 762 return get_children_pid(file_inode(seq->file), NULL, *pos); 763 } 764 765 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 766 { 767 struct pid *pid; 768 769 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 770 put_pid(v); 771 772 ++*pos; 773 return pid; 774 } 775 776 static void children_seq_stop(struct seq_file *seq, void *v) 777 { 778 put_pid(v); 779 } 780 781 static const struct seq_operations children_seq_ops = { 782 .start = children_seq_start, 783 .next = children_seq_next, 784 .stop = children_seq_stop, 785 .show = children_seq_show, 786 }; 787 788 static int children_seq_open(struct inode *inode, struct file *file) 789 { 790 return seq_open(file, &children_seq_ops); 791 } 792 793 const struct file_operations proc_tid_children_operations = { 794 .open = children_seq_open, 795 .read = seq_read, 796 .llseek = seq_lseek, 797 .release = seq_release, 798 }; 799 #endif /* CONFIG_PROC_CHILDREN */ 800