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/uaccess.h> 73 #include <linux/io.h> 74 #include <linux/mm.h> 75 #include <linux/hugetlb.h> 76 #include <linux/pagemap.h> 77 #include <linux/swap.h> 78 #include <linux/smp.h> 79 #include <linux/signal.h> 80 #include <linux/highmem.h> 81 #include <linux/file.h> 82 #include <linux/fdtable.h> 83 #include <linux/times.h> 84 #include <linux/cpuset.h> 85 #include <linux/rcupdate.h> 86 #include <linux/delayacct.h> 87 #include <linux/seq_file.h> 88 #include <linux/pid_namespace.h> 89 #include <linux/prctl.h> 90 #include <linux/ptrace.h> 91 #include <linux/tracehook.h> 92 #include <linux/string_helpers.h> 93 #include <linux/user_namespace.h> 94 #include <linux/fs_struct.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 if (p->flags & PF_WQ_WORKER) 104 wq_worker_comm(tcomm, sizeof(tcomm), p); 105 else 106 __get_task_comm(tcomm, sizeof(tcomm), p); 107 108 if (escape) 109 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 110 else 111 seq_printf(m, "%.64s", tcomm); 112 } 113 114 /* 115 * The task state array is a strange "bitmap" of 116 * reasons to sleep. Thus "running" is zero, and 117 * you can test for combinations of others with 118 * simple bit tests. 119 */ 120 static const char * const task_state_array[] = { 121 122 /* states in TASK_REPORT: */ 123 "R (running)", /* 0x00 */ 124 "S (sleeping)", /* 0x01 */ 125 "D (disk sleep)", /* 0x02 */ 126 "T (stopped)", /* 0x04 */ 127 "t (tracing stop)", /* 0x08 */ 128 "X (dead)", /* 0x10 */ 129 "Z (zombie)", /* 0x20 */ 130 "P (parked)", /* 0x40 */ 131 132 /* states beyond TASK_REPORT: */ 133 "I (idle)", /* 0x80 */ 134 }; 135 136 static inline const char *get_task_state(struct task_struct *tsk) 137 { 138 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 139 return task_state_array[task_state_index(tsk)]; 140 } 141 142 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 143 struct pid *pid, struct task_struct *p) 144 { 145 struct user_namespace *user_ns = seq_user_ns(m); 146 struct group_info *group_info; 147 int g, umask = -1; 148 struct task_struct *tracer; 149 const struct cred *cred; 150 pid_t ppid, tpid = 0, tgid, ngid; 151 unsigned int max_fds = 0; 152 153 rcu_read_lock(); 154 ppid = pid_alive(p) ? 155 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 156 157 tracer = ptrace_parent(p); 158 if (tracer) 159 tpid = task_pid_nr_ns(tracer, ns); 160 161 tgid = task_tgid_nr_ns(p, ns); 162 ngid = task_numa_group_id(p); 163 cred = get_task_cred(p); 164 165 task_lock(p); 166 if (p->fs) 167 umask = p->fs->umask; 168 if (p->files) 169 max_fds = files_fdtable(p->files)->max_fds; 170 task_unlock(p); 171 rcu_read_unlock(); 172 173 if (umask >= 0) 174 seq_printf(m, "Umask:\t%#04o\n", umask); 175 seq_puts(m, "State:\t"); 176 seq_puts(m, get_task_state(p)); 177 178 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 179 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 180 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 181 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 182 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 183 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 184 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 185 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 186 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 187 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 188 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 189 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 190 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 191 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 192 193 seq_puts(m, "\nGroups:\t"); 194 group_info = cred->group_info; 195 for (g = 0; g < group_info->ngroups; g++) 196 seq_put_decimal_ull(m, g ? " " : "", 197 from_kgid_munged(user_ns, group_info->gid[g])); 198 put_cred(cred); 199 /* Trailing space shouldn't have been added in the first place. */ 200 seq_putc(m, ' '); 201 202 #ifdef CONFIG_PID_NS 203 seq_puts(m, "\nNStgid:"); 204 for (g = ns->level; g <= pid->level; g++) 205 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 206 seq_puts(m, "\nNSpid:"); 207 for (g = ns->level; g <= pid->level; g++) 208 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 209 seq_puts(m, "\nNSpgid:"); 210 for (g = ns->level; g <= pid->level; g++) 211 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 212 seq_puts(m, "\nNSsid:"); 213 for (g = ns->level; g <= pid->level; g++) 214 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 215 #endif 216 seq_putc(m, '\n'); 217 } 218 219 void render_sigset_t(struct seq_file *m, const char *header, 220 sigset_t *set) 221 { 222 int i; 223 224 seq_puts(m, header); 225 226 i = _NSIG; 227 do { 228 int x = 0; 229 230 i -= 4; 231 if (sigismember(set, i+1)) x |= 1; 232 if (sigismember(set, i+2)) x |= 2; 233 if (sigismember(set, i+3)) x |= 4; 234 if (sigismember(set, i+4)) x |= 8; 235 seq_putc(m, hex_asc[x]); 236 } while (i >= 4); 237 238 seq_putc(m, '\n'); 239 } 240 241 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 242 sigset_t *sigcatch) 243 { 244 struct k_sigaction *k; 245 int i; 246 247 k = p->sighand->action; 248 for (i = 1; i <= _NSIG; ++i, ++k) { 249 if (k->sa.sa_handler == SIG_IGN) 250 sigaddset(sigign, i); 251 else if (k->sa.sa_handler != SIG_DFL) 252 sigaddset(sigcatch, i); 253 } 254 } 255 256 static inline void task_sig(struct seq_file *m, struct task_struct *p) 257 { 258 unsigned long flags; 259 sigset_t pending, shpending, blocked, ignored, caught; 260 int num_threads = 0; 261 unsigned int qsize = 0; 262 unsigned long qlim = 0; 263 264 sigemptyset(&pending); 265 sigemptyset(&shpending); 266 sigemptyset(&blocked); 267 sigemptyset(&ignored); 268 sigemptyset(&caught); 269 270 if (lock_task_sighand(p, &flags)) { 271 pending = p->pending.signal; 272 shpending = p->signal->shared_pending.signal; 273 blocked = p->blocked; 274 collect_sigign_sigcatch(p, &ignored, &caught); 275 num_threads = get_nr_threads(p); 276 rcu_read_lock(); /* FIXME: is this correct? */ 277 qsize = get_ucounts_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 278 rcu_read_unlock(); 279 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 280 unlock_task_sighand(p, &flags); 281 } 282 283 seq_put_decimal_ull(m, "Threads:\t", num_threads); 284 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 285 seq_put_decimal_ull(m, "/", qlim); 286 287 /* render them all */ 288 render_sigset_t(m, "\nSigPnd:\t", &pending); 289 render_sigset_t(m, "ShdPnd:\t", &shpending); 290 render_sigset_t(m, "SigBlk:\t", &blocked); 291 render_sigset_t(m, "SigIgn:\t", &ignored); 292 render_sigset_t(m, "SigCgt:\t", &caught); 293 } 294 295 static void render_cap_t(struct seq_file *m, const char *header, 296 kernel_cap_t *a) 297 { 298 unsigned __capi; 299 300 seq_puts(m, header); 301 CAP_FOR_EACH_U32(__capi) { 302 seq_put_hex_ll(m, NULL, 303 a->cap[CAP_LAST_U32 - __capi], 8); 304 } 305 seq_putc(m, '\n'); 306 } 307 308 static inline void task_cap(struct seq_file *m, struct task_struct *p) 309 { 310 const struct cred *cred; 311 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 312 cap_bset, cap_ambient; 313 314 rcu_read_lock(); 315 cred = __task_cred(p); 316 cap_inheritable = cred->cap_inheritable; 317 cap_permitted = cred->cap_permitted; 318 cap_effective = cred->cap_effective; 319 cap_bset = cred->cap_bset; 320 cap_ambient = cred->cap_ambient; 321 rcu_read_unlock(); 322 323 render_cap_t(m, "CapInh:\t", &cap_inheritable); 324 render_cap_t(m, "CapPrm:\t", &cap_permitted); 325 render_cap_t(m, "CapEff:\t", &cap_effective); 326 render_cap_t(m, "CapBnd:\t", &cap_bset); 327 render_cap_t(m, "CapAmb:\t", &cap_ambient); 328 } 329 330 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 331 { 332 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 333 #ifdef CONFIG_SECCOMP 334 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 335 #ifdef CONFIG_SECCOMP_FILTER 336 seq_put_decimal_ull(m, "\nSeccomp_filters:\t", 337 atomic_read(&p->seccomp.filter_count)); 338 #endif 339 #endif 340 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 341 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 342 case -EINVAL: 343 seq_puts(m, "unknown"); 344 break; 345 case PR_SPEC_NOT_AFFECTED: 346 seq_puts(m, "not vulnerable"); 347 break; 348 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 349 seq_puts(m, "thread force mitigated"); 350 break; 351 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 352 seq_puts(m, "thread mitigated"); 353 break; 354 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 355 seq_puts(m, "thread vulnerable"); 356 break; 357 case PR_SPEC_DISABLE: 358 seq_puts(m, "globally mitigated"); 359 break; 360 default: 361 seq_puts(m, "vulnerable"); 362 break; 363 } 364 365 seq_puts(m, "\nSpeculationIndirectBranch:\t"); 366 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) { 367 case -EINVAL: 368 seq_puts(m, "unsupported"); 369 break; 370 case PR_SPEC_NOT_AFFECTED: 371 seq_puts(m, "not affected"); 372 break; 373 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 374 seq_puts(m, "conditional force disabled"); 375 break; 376 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 377 seq_puts(m, "conditional disabled"); 378 break; 379 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 380 seq_puts(m, "conditional enabled"); 381 break; 382 case PR_SPEC_ENABLE: 383 seq_puts(m, "always enabled"); 384 break; 385 case PR_SPEC_DISABLE: 386 seq_puts(m, "always disabled"); 387 break; 388 default: 389 seq_puts(m, "unknown"); 390 break; 391 } 392 seq_putc(m, '\n'); 393 } 394 395 static inline void task_context_switch_counts(struct seq_file *m, 396 struct task_struct *p) 397 { 398 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 399 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 400 seq_putc(m, '\n'); 401 } 402 403 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 404 { 405 seq_printf(m, "Cpus_allowed:\t%*pb\n", 406 cpumask_pr_args(&task->cpus_mask)); 407 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 408 cpumask_pr_args(&task->cpus_mask)); 409 } 410 411 static inline void task_core_dumping(struct seq_file *m, struct task_struct *task) 412 { 413 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state); 414 seq_putc(m, '\n'); 415 } 416 417 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 418 { 419 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 420 421 if (thp_enabled) 422 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags); 423 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 424 } 425 426 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 427 struct pid *pid, struct task_struct *task) 428 { 429 struct mm_struct *mm = get_task_mm(task); 430 431 seq_puts(m, "Name:\t"); 432 proc_task_name(m, task, true); 433 seq_putc(m, '\n'); 434 435 task_state(m, ns, pid, task); 436 437 if (mm) { 438 task_mem(m, mm); 439 task_core_dumping(m, task); 440 task_thp_status(m, mm); 441 mmput(mm); 442 } 443 task_sig(m, task); 444 task_cap(m, task); 445 task_seccomp(m, task); 446 task_cpus_allowed(m, task); 447 cpuset_task_status_allowed(m, task); 448 task_context_switch_counts(m, task); 449 return 0; 450 } 451 452 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 453 struct pid *pid, struct task_struct *task, int whole) 454 { 455 unsigned long vsize, eip, esp, wchan = 0; 456 int priority, nice; 457 int tty_pgrp = -1, tty_nr = 0; 458 sigset_t sigign, sigcatch; 459 char state; 460 pid_t ppid = 0, pgid = -1, sid = -1; 461 int num_threads = 0; 462 int permitted; 463 struct mm_struct *mm; 464 unsigned long long start_time; 465 unsigned long cmin_flt = 0, cmaj_flt = 0; 466 unsigned long min_flt = 0, maj_flt = 0; 467 u64 cutime, cstime, utime, stime; 468 u64 cgtime, gtime; 469 unsigned long rsslim = 0; 470 unsigned long flags; 471 472 state = *get_task_state(task); 473 vsize = eip = esp = 0; 474 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 475 mm = get_task_mm(task); 476 if (mm) { 477 vsize = task_vsize(mm); 478 /* 479 * esp and eip are intentionally zeroed out. There is no 480 * non-racy way to read them without freezing the task. 481 * Programs that need reliable values can use ptrace(2). 482 * 483 * The only exception is if the task is core dumping because 484 * a program is not able to use ptrace(2) in that case. It is 485 * safe because the task has stopped executing permanently. 486 */ 487 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 488 if (try_get_task_stack(task)) { 489 eip = KSTK_EIP(task); 490 esp = KSTK_ESP(task); 491 put_task_stack(task); 492 } 493 } 494 } 495 496 sigemptyset(&sigign); 497 sigemptyset(&sigcatch); 498 cutime = cstime = utime = stime = 0; 499 cgtime = gtime = 0; 500 501 if (lock_task_sighand(task, &flags)) { 502 struct signal_struct *sig = task->signal; 503 504 if (sig->tty) { 505 struct pid *pgrp = tty_get_pgrp(sig->tty); 506 tty_pgrp = pid_nr_ns(pgrp, ns); 507 put_pid(pgrp); 508 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 509 } 510 511 num_threads = get_nr_threads(task); 512 collect_sigign_sigcatch(task, &sigign, &sigcatch); 513 514 cmin_flt = sig->cmin_flt; 515 cmaj_flt = sig->cmaj_flt; 516 cutime = sig->cutime; 517 cstime = sig->cstime; 518 cgtime = sig->cgtime; 519 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 520 521 /* add up live thread stats at the group level */ 522 if (whole) { 523 struct task_struct *t = task; 524 do { 525 min_flt += t->min_flt; 526 maj_flt += t->maj_flt; 527 gtime += task_gtime(t); 528 } while_each_thread(task, t); 529 530 min_flt += sig->min_flt; 531 maj_flt += sig->maj_flt; 532 thread_group_cputime_adjusted(task, &utime, &stime); 533 gtime += sig->gtime; 534 } 535 536 sid = task_session_nr_ns(task, ns); 537 ppid = task_tgid_nr_ns(task->real_parent, ns); 538 pgid = task_pgrp_nr_ns(task, ns); 539 540 unlock_task_sighand(task, &flags); 541 } 542 543 if (permitted && (!whole || num_threads < 2)) 544 wchan = !task_is_running(task); 545 if (!whole) { 546 min_flt = task->min_flt; 547 maj_flt = task->maj_flt; 548 task_cputime_adjusted(task, &utime, &stime); 549 gtime = task_gtime(task); 550 } 551 552 /* scale priority and nice values from timeslices to -20..20 */ 553 /* to make it look like a "normal" Unix priority/nice value */ 554 priority = task_prio(task); 555 nice = task_nice(task); 556 557 /* apply timens offset for boottime and convert nsec -> ticks */ 558 start_time = 559 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 560 561 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 562 seq_puts(m, " ("); 563 proc_task_name(m, task, false); 564 seq_puts(m, ") "); 565 seq_putc(m, state); 566 seq_put_decimal_ll(m, " ", ppid); 567 seq_put_decimal_ll(m, " ", pgid); 568 seq_put_decimal_ll(m, " ", sid); 569 seq_put_decimal_ll(m, " ", tty_nr); 570 seq_put_decimal_ll(m, " ", tty_pgrp); 571 seq_put_decimal_ull(m, " ", task->flags); 572 seq_put_decimal_ull(m, " ", min_flt); 573 seq_put_decimal_ull(m, " ", cmin_flt); 574 seq_put_decimal_ull(m, " ", maj_flt); 575 seq_put_decimal_ull(m, " ", cmaj_flt); 576 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 577 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 578 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 579 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 580 seq_put_decimal_ll(m, " ", priority); 581 seq_put_decimal_ll(m, " ", nice); 582 seq_put_decimal_ll(m, " ", num_threads); 583 seq_put_decimal_ull(m, " ", 0); 584 seq_put_decimal_ull(m, " ", start_time); 585 seq_put_decimal_ull(m, " ", vsize); 586 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 587 seq_put_decimal_ull(m, " ", rsslim); 588 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 589 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 590 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 591 seq_put_decimal_ull(m, " ", esp); 592 seq_put_decimal_ull(m, " ", eip); 593 /* The signal information here is obsolete. 594 * It must be decimal for Linux 2.0 compatibility. 595 * Use /proc/#/status for real-time signals. 596 */ 597 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 598 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 599 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 600 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 601 602 /* 603 * We used to output the absolute kernel address, but that's an 604 * information leak - so instead we show a 0/1 flag here, to signal 605 * to user-space whether there's a wchan field in /proc/PID/wchan. 606 * 607 * This works with older implementations of procps as well. 608 */ 609 seq_put_decimal_ull(m, " ", wchan); 610 611 seq_put_decimal_ull(m, " ", 0); 612 seq_put_decimal_ull(m, " ", 0); 613 seq_put_decimal_ll(m, " ", task->exit_signal); 614 seq_put_decimal_ll(m, " ", task_cpu(task)); 615 seq_put_decimal_ull(m, " ", task->rt_priority); 616 seq_put_decimal_ull(m, " ", task->policy); 617 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 618 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 619 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 620 621 if (mm && permitted) { 622 seq_put_decimal_ull(m, " ", mm->start_data); 623 seq_put_decimal_ull(m, " ", mm->end_data); 624 seq_put_decimal_ull(m, " ", mm->start_brk); 625 seq_put_decimal_ull(m, " ", mm->arg_start); 626 seq_put_decimal_ull(m, " ", mm->arg_end); 627 seq_put_decimal_ull(m, " ", mm->env_start); 628 seq_put_decimal_ull(m, " ", mm->env_end); 629 } else 630 seq_puts(m, " 0 0 0 0 0 0 0"); 631 632 if (permitted) 633 seq_put_decimal_ll(m, " ", task->exit_code); 634 else 635 seq_puts(m, " 0"); 636 637 seq_putc(m, '\n'); 638 if (mm) 639 mmput(mm); 640 return 0; 641 } 642 643 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 644 struct pid *pid, struct task_struct *task) 645 { 646 return do_task_stat(m, ns, pid, task, 0); 647 } 648 649 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 650 struct pid *pid, struct task_struct *task) 651 { 652 return do_task_stat(m, ns, pid, task, 1); 653 } 654 655 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 656 struct pid *pid, struct task_struct *task) 657 { 658 struct mm_struct *mm = get_task_mm(task); 659 660 if (mm) { 661 unsigned long size; 662 unsigned long resident = 0; 663 unsigned long shared = 0; 664 unsigned long text = 0; 665 unsigned long data = 0; 666 667 size = task_statm(mm, &shared, &text, &data, &resident); 668 mmput(mm); 669 670 /* 671 * For quick read, open code by putting numbers directly 672 * expected format is 673 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 674 * size, resident, shared, text, data); 675 */ 676 seq_put_decimal_ull(m, "", size); 677 seq_put_decimal_ull(m, " ", resident); 678 seq_put_decimal_ull(m, " ", shared); 679 seq_put_decimal_ull(m, " ", text); 680 seq_put_decimal_ull(m, " ", 0); 681 seq_put_decimal_ull(m, " ", data); 682 seq_put_decimal_ull(m, " ", 0); 683 seq_putc(m, '\n'); 684 } else { 685 seq_write(m, "0 0 0 0 0 0 0\n", 14); 686 } 687 return 0; 688 } 689 690 #ifdef CONFIG_PROC_CHILDREN 691 static struct pid * 692 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 693 { 694 struct task_struct *start, *task; 695 struct pid *pid = NULL; 696 697 read_lock(&tasklist_lock); 698 699 start = pid_task(proc_pid(inode), PIDTYPE_PID); 700 if (!start) 701 goto out; 702 703 /* 704 * Lets try to continue searching first, this gives 705 * us significant speedup on children-rich processes. 706 */ 707 if (pid_prev) { 708 task = pid_task(pid_prev, PIDTYPE_PID); 709 if (task && task->real_parent == start && 710 !(list_empty(&task->sibling))) { 711 if (list_is_last(&task->sibling, &start->children)) 712 goto out; 713 task = list_first_entry(&task->sibling, 714 struct task_struct, sibling); 715 pid = get_pid(task_pid(task)); 716 goto out; 717 } 718 } 719 720 /* 721 * Slow search case. 722 * 723 * We might miss some children here if children 724 * are exited while we were not holding the lock, 725 * but it was never promised to be accurate that 726 * much. 727 * 728 * "Just suppose that the parent sleeps, but N children 729 * exit after we printed their tids. Now the slow paths 730 * skips N extra children, we miss N tasks." (c) 731 * 732 * So one need to stop or freeze the leader and all 733 * its children to get a precise result. 734 */ 735 list_for_each_entry(task, &start->children, sibling) { 736 if (pos-- == 0) { 737 pid = get_pid(task_pid(task)); 738 break; 739 } 740 } 741 742 out: 743 read_unlock(&tasklist_lock); 744 return pid; 745 } 746 747 static int children_seq_show(struct seq_file *seq, void *v) 748 { 749 struct inode *inode = file_inode(seq->file); 750 751 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 752 return 0; 753 } 754 755 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 756 { 757 return get_children_pid(file_inode(seq->file), NULL, *pos); 758 } 759 760 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 761 { 762 struct pid *pid; 763 764 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 765 put_pid(v); 766 767 ++*pos; 768 return pid; 769 } 770 771 static void children_seq_stop(struct seq_file *seq, void *v) 772 { 773 put_pid(v); 774 } 775 776 static const struct seq_operations children_seq_ops = { 777 .start = children_seq_start, 778 .next = children_seq_next, 779 .stop = children_seq_stop, 780 .show = children_seq_show, 781 }; 782 783 static int children_seq_open(struct inode *inode, struct file *file) 784 { 785 return seq_open(file, &children_seq_ops); 786 } 787 788 const struct file_operations proc_tid_children_operations = { 789 .open = children_seq_open, 790 .read = seq_read, 791 .llseek = seq_lseek, 792 .release = seq_release, 793 }; 794 #endif /* CONFIG_PROC_CHILDREN */ 795