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/string_helpers.h> 92 #include <linux/user_namespace.h> 93 #include <linux/fs_struct.h> 94 #include <linux/kthread.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 if (p->flags & PF_KTHREAD) 106 get_kthread_comm(tcomm, sizeof(tcomm), p); 107 else 108 __get_task_comm(tcomm, sizeof(tcomm), p); 109 110 if (escape) 111 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 112 else 113 seq_printf(m, "%.64s", tcomm); 114 } 115 116 /* 117 * The task state array is a strange "bitmap" of 118 * reasons to sleep. Thus "running" is zero, and 119 * you can test for combinations of others with 120 * simple bit tests. 121 */ 122 static const char * const task_state_array[] = { 123 124 /* states in TASK_REPORT: */ 125 "R (running)", /* 0x00 */ 126 "S (sleeping)", /* 0x01 */ 127 "D (disk sleep)", /* 0x02 */ 128 "T (stopped)", /* 0x04 */ 129 "t (tracing stop)", /* 0x08 */ 130 "X (dead)", /* 0x10 */ 131 "Z (zombie)", /* 0x20 */ 132 "P (parked)", /* 0x40 */ 133 134 /* states beyond TASK_REPORT: */ 135 "I (idle)", /* 0x80 */ 136 }; 137 138 static inline const char *get_task_state(struct task_struct *tsk) 139 { 140 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 141 return task_state_array[task_state_index(tsk)]; 142 } 143 144 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 145 struct pid *pid, struct task_struct *p) 146 { 147 struct user_namespace *user_ns = seq_user_ns(m); 148 struct group_info *group_info; 149 int g, umask = -1; 150 struct task_struct *tracer; 151 const struct cred *cred; 152 pid_t ppid, tpid = 0, tgid, ngid; 153 unsigned int max_fds = 0; 154 155 rcu_read_lock(); 156 ppid = pid_alive(p) ? 157 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 158 159 tracer = ptrace_parent(p); 160 if (tracer) 161 tpid = task_pid_nr_ns(tracer, ns); 162 163 tgid = task_tgid_nr_ns(p, ns); 164 ngid = task_numa_group_id(p); 165 cred = get_task_cred(p); 166 167 task_lock(p); 168 if (p->fs) 169 umask = p->fs->umask; 170 if (p->files) 171 max_fds = files_fdtable(p->files)->max_fds; 172 task_unlock(p); 173 rcu_read_unlock(); 174 175 if (umask >= 0) 176 seq_printf(m, "Umask:\t%#04o\n", umask); 177 seq_puts(m, "State:\t"); 178 seq_puts(m, get_task_state(p)); 179 180 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 181 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 182 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 183 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 184 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 185 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 186 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 187 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 188 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 189 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 190 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 191 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 192 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 193 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 194 195 seq_puts(m, "\nGroups:\t"); 196 group_info = cred->group_info; 197 for (g = 0; g < group_info->ngroups; g++) 198 seq_put_decimal_ull(m, g ? " " : "", 199 from_kgid_munged(user_ns, group_info->gid[g])); 200 put_cred(cred); 201 /* Trailing space shouldn't have been added in the first place. */ 202 seq_putc(m, ' '); 203 204 #ifdef CONFIG_PID_NS 205 seq_puts(m, "\nNStgid:"); 206 for (g = ns->level; g <= pid->level; g++) 207 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 208 seq_puts(m, "\nNSpid:"); 209 for (g = ns->level; g <= pid->level; g++) 210 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 211 seq_puts(m, "\nNSpgid:"); 212 for (g = ns->level; g <= pid->level; g++) 213 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 214 seq_puts(m, "\nNSsid:"); 215 for (g = ns->level; g <= pid->level; g++) 216 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 217 #endif 218 seq_putc(m, '\n'); 219 } 220 221 void render_sigset_t(struct seq_file *m, const char *header, 222 sigset_t *set) 223 { 224 int i; 225 226 seq_puts(m, header); 227 228 i = _NSIG; 229 do { 230 int x = 0; 231 232 i -= 4; 233 if (sigismember(set, i+1)) x |= 1; 234 if (sigismember(set, i+2)) x |= 2; 235 if (sigismember(set, i+3)) x |= 4; 236 if (sigismember(set, i+4)) x |= 8; 237 seq_putc(m, hex_asc[x]); 238 } while (i >= 4); 239 240 seq_putc(m, '\n'); 241 } 242 243 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 244 sigset_t *sigcatch) 245 { 246 struct k_sigaction *k; 247 int i; 248 249 k = p->sighand->action; 250 for (i = 1; i <= _NSIG; ++i, ++k) { 251 if (k->sa.sa_handler == SIG_IGN) 252 sigaddset(sigign, i); 253 else if (k->sa.sa_handler != SIG_DFL) 254 sigaddset(sigcatch, i); 255 } 256 } 257 258 static inline void task_sig(struct seq_file *m, struct task_struct *p) 259 { 260 unsigned long flags; 261 sigset_t pending, shpending, blocked, ignored, caught; 262 int num_threads = 0; 263 unsigned int qsize = 0; 264 unsigned long qlim = 0; 265 266 sigemptyset(&pending); 267 sigemptyset(&shpending); 268 sigemptyset(&blocked); 269 sigemptyset(&ignored); 270 sigemptyset(&caught); 271 272 if (lock_task_sighand(p, &flags)) { 273 pending = p->pending.signal; 274 shpending = p->signal->shared_pending.signal; 275 blocked = p->blocked; 276 collect_sigign_sigcatch(p, &ignored, &caught); 277 num_threads = get_nr_threads(p); 278 rcu_read_lock(); /* FIXME: is this correct? */ 279 qsize = get_ucounts_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 280 rcu_read_unlock(); 281 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 282 unlock_task_sighand(p, &flags); 283 } 284 285 seq_put_decimal_ull(m, "Threads:\t", num_threads); 286 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 287 seq_put_decimal_ull(m, "/", qlim); 288 289 /* render them all */ 290 render_sigset_t(m, "\nSigPnd:\t", &pending); 291 render_sigset_t(m, "ShdPnd:\t", &shpending); 292 render_sigset_t(m, "SigBlk:\t", &blocked); 293 render_sigset_t(m, "SigIgn:\t", &ignored); 294 render_sigset_t(m, "SigCgt:\t", &caught); 295 } 296 297 static void render_cap_t(struct seq_file *m, const char *header, 298 kernel_cap_t *a) 299 { 300 unsigned __capi; 301 302 seq_puts(m, header); 303 CAP_FOR_EACH_U32(__capi) { 304 seq_put_hex_ll(m, NULL, 305 a->cap[CAP_LAST_U32 - __capi], 8); 306 } 307 seq_putc(m, '\n'); 308 } 309 310 static inline void task_cap(struct seq_file *m, struct task_struct *p) 311 { 312 const struct cred *cred; 313 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 314 cap_bset, cap_ambient; 315 316 rcu_read_lock(); 317 cred = __task_cred(p); 318 cap_inheritable = cred->cap_inheritable; 319 cap_permitted = cred->cap_permitted; 320 cap_effective = cred->cap_effective; 321 cap_bset = cred->cap_bset; 322 cap_ambient = cred->cap_ambient; 323 rcu_read_unlock(); 324 325 render_cap_t(m, "CapInh:\t", &cap_inheritable); 326 render_cap_t(m, "CapPrm:\t", &cap_permitted); 327 render_cap_t(m, "CapEff:\t", &cap_effective); 328 render_cap_t(m, "CapBnd:\t", &cap_bset); 329 render_cap_t(m, "CapAmb:\t", &cap_ambient); 330 } 331 332 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 333 { 334 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 335 #ifdef CONFIG_SECCOMP 336 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 337 #ifdef CONFIG_SECCOMP_FILTER 338 seq_put_decimal_ull(m, "\nSeccomp_filters:\t", 339 atomic_read(&p->seccomp.filter_count)); 340 #endif 341 #endif 342 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 343 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 344 case -EINVAL: 345 seq_puts(m, "unknown"); 346 break; 347 case PR_SPEC_NOT_AFFECTED: 348 seq_puts(m, "not vulnerable"); 349 break; 350 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 351 seq_puts(m, "thread force mitigated"); 352 break; 353 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 354 seq_puts(m, "thread mitigated"); 355 break; 356 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 357 seq_puts(m, "thread vulnerable"); 358 break; 359 case PR_SPEC_DISABLE: 360 seq_puts(m, "globally mitigated"); 361 break; 362 default: 363 seq_puts(m, "vulnerable"); 364 break; 365 } 366 367 seq_puts(m, "\nSpeculationIndirectBranch:\t"); 368 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) { 369 case -EINVAL: 370 seq_puts(m, "unsupported"); 371 break; 372 case PR_SPEC_NOT_AFFECTED: 373 seq_puts(m, "not affected"); 374 break; 375 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 376 seq_puts(m, "conditional force disabled"); 377 break; 378 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 379 seq_puts(m, "conditional disabled"); 380 break; 381 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 382 seq_puts(m, "conditional enabled"); 383 break; 384 case PR_SPEC_ENABLE: 385 seq_puts(m, "always enabled"); 386 break; 387 case PR_SPEC_DISABLE: 388 seq_puts(m, "always disabled"); 389 break; 390 default: 391 seq_puts(m, "unknown"); 392 break; 393 } 394 seq_putc(m, '\n'); 395 } 396 397 static inline void task_context_switch_counts(struct seq_file *m, 398 struct task_struct *p) 399 { 400 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 401 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 402 seq_putc(m, '\n'); 403 } 404 405 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 406 { 407 seq_printf(m, "Cpus_allowed:\t%*pb\n", 408 cpumask_pr_args(&task->cpus_mask)); 409 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 410 cpumask_pr_args(&task->cpus_mask)); 411 } 412 413 static inline void task_core_dumping(struct seq_file *m, struct task_struct *task) 414 { 415 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state); 416 seq_putc(m, '\n'); 417 } 418 419 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 420 { 421 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 422 423 if (thp_enabled) 424 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags); 425 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 426 } 427 428 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 429 struct pid *pid, struct task_struct *task) 430 { 431 struct mm_struct *mm = get_task_mm(task); 432 433 seq_puts(m, "Name:\t"); 434 proc_task_name(m, task, true); 435 seq_putc(m, '\n'); 436 437 task_state(m, ns, pid, task); 438 439 if (mm) { 440 task_mem(m, mm); 441 task_core_dumping(m, task); 442 task_thp_status(m, mm); 443 mmput(mm); 444 } 445 task_sig(m, task); 446 task_cap(m, task); 447 task_seccomp(m, task); 448 task_cpus_allowed(m, task); 449 cpuset_task_status_allowed(m, task); 450 task_context_switch_counts(m, task); 451 return 0; 452 } 453 454 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 455 struct pid *pid, struct task_struct *task, int whole) 456 { 457 unsigned long vsize, eip, esp, wchan = 0; 458 int priority, nice; 459 int tty_pgrp = -1, tty_nr = 0; 460 sigset_t sigign, sigcatch; 461 char state; 462 pid_t ppid = 0, pgid = -1, sid = -1; 463 int num_threads = 0; 464 int permitted; 465 struct mm_struct *mm; 466 unsigned long long start_time; 467 unsigned long cmin_flt = 0, cmaj_flt = 0; 468 unsigned long min_flt = 0, maj_flt = 0; 469 u64 cutime, cstime, utime, stime; 470 u64 cgtime, gtime; 471 unsigned long rsslim = 0; 472 unsigned long flags; 473 int exit_code = task->exit_code; 474 475 state = *get_task_state(task); 476 vsize = eip = esp = 0; 477 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 478 mm = get_task_mm(task); 479 if (mm) { 480 vsize = task_vsize(mm); 481 /* 482 * esp and eip are intentionally zeroed out. There is no 483 * non-racy way to read them without freezing the task. 484 * Programs that need reliable values can use ptrace(2). 485 * 486 * The only exception is if the task is core dumping because 487 * a program is not able to use ptrace(2) in that case. It is 488 * safe because the task has stopped executing permanently. 489 */ 490 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 491 if (try_get_task_stack(task)) { 492 eip = KSTK_EIP(task); 493 esp = KSTK_ESP(task); 494 put_task_stack(task); 495 } 496 } 497 } 498 499 sigemptyset(&sigign); 500 sigemptyset(&sigcatch); 501 cutime = cstime = utime = stime = 0; 502 cgtime = gtime = 0; 503 504 if (lock_task_sighand(task, &flags)) { 505 struct signal_struct *sig = task->signal; 506 507 if (sig->tty) { 508 struct pid *pgrp = tty_get_pgrp(sig->tty); 509 tty_pgrp = pid_nr_ns(pgrp, ns); 510 put_pid(pgrp); 511 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 512 } 513 514 num_threads = get_nr_threads(task); 515 collect_sigign_sigcatch(task, &sigign, &sigcatch); 516 517 cmin_flt = sig->cmin_flt; 518 cmaj_flt = sig->cmaj_flt; 519 cutime = sig->cutime; 520 cstime = sig->cstime; 521 cgtime = sig->cgtime; 522 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 523 524 /* add up live thread stats at the group level */ 525 if (whole) { 526 struct task_struct *t = task; 527 do { 528 min_flt += t->min_flt; 529 maj_flt += t->maj_flt; 530 gtime += task_gtime(t); 531 } while_each_thread(task, t); 532 533 min_flt += sig->min_flt; 534 maj_flt += sig->maj_flt; 535 thread_group_cputime_adjusted(task, &utime, &stime); 536 gtime += sig->gtime; 537 538 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 539 exit_code = sig->group_exit_code; 540 } 541 542 sid = task_session_nr_ns(task, ns); 543 ppid = task_tgid_nr_ns(task->real_parent, ns); 544 pgid = task_pgrp_nr_ns(task, ns); 545 546 unlock_task_sighand(task, &flags); 547 } 548 549 if (permitted && (!whole || num_threads < 2)) 550 wchan = !task_is_running(task); 551 if (!whole) { 552 min_flt = task->min_flt; 553 maj_flt = task->maj_flt; 554 task_cputime_adjusted(task, &utime, &stime); 555 gtime = task_gtime(task); 556 } 557 558 /* scale priority and nice values from timeslices to -20..20 */ 559 /* to make it look like a "normal" Unix priority/nice value */ 560 priority = task_prio(task); 561 nice = task_nice(task); 562 563 /* apply timens offset for boottime and convert nsec -> ticks */ 564 start_time = 565 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 566 567 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 568 seq_puts(m, " ("); 569 proc_task_name(m, task, false); 570 seq_puts(m, ") "); 571 seq_putc(m, state); 572 seq_put_decimal_ll(m, " ", ppid); 573 seq_put_decimal_ll(m, " ", pgid); 574 seq_put_decimal_ll(m, " ", sid); 575 seq_put_decimal_ll(m, " ", tty_nr); 576 seq_put_decimal_ll(m, " ", tty_pgrp); 577 seq_put_decimal_ull(m, " ", task->flags); 578 seq_put_decimal_ull(m, " ", min_flt); 579 seq_put_decimal_ull(m, " ", cmin_flt); 580 seq_put_decimal_ull(m, " ", maj_flt); 581 seq_put_decimal_ull(m, " ", cmaj_flt); 582 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 583 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 584 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 585 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 586 seq_put_decimal_ll(m, " ", priority); 587 seq_put_decimal_ll(m, " ", nice); 588 seq_put_decimal_ll(m, " ", num_threads); 589 seq_put_decimal_ull(m, " ", 0); 590 seq_put_decimal_ull(m, " ", start_time); 591 seq_put_decimal_ull(m, " ", vsize); 592 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 593 seq_put_decimal_ull(m, " ", rsslim); 594 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 595 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 596 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 597 seq_put_decimal_ull(m, " ", esp); 598 seq_put_decimal_ull(m, " ", eip); 599 /* The signal information here is obsolete. 600 * It must be decimal for Linux 2.0 compatibility. 601 * Use /proc/#/status for real-time signals. 602 */ 603 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 604 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 605 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 606 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 607 608 /* 609 * We used to output the absolute kernel address, but that's an 610 * information leak - so instead we show a 0/1 flag here, to signal 611 * to user-space whether there's a wchan field in /proc/PID/wchan. 612 * 613 * This works with older implementations of procps as well. 614 */ 615 seq_put_decimal_ull(m, " ", wchan); 616 617 seq_put_decimal_ull(m, " ", 0); 618 seq_put_decimal_ull(m, " ", 0); 619 seq_put_decimal_ll(m, " ", task->exit_signal); 620 seq_put_decimal_ll(m, " ", task_cpu(task)); 621 seq_put_decimal_ull(m, " ", task->rt_priority); 622 seq_put_decimal_ull(m, " ", task->policy); 623 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 624 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 625 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 626 627 if (mm && permitted) { 628 seq_put_decimal_ull(m, " ", mm->start_data); 629 seq_put_decimal_ull(m, " ", mm->end_data); 630 seq_put_decimal_ull(m, " ", mm->start_brk); 631 seq_put_decimal_ull(m, " ", mm->arg_start); 632 seq_put_decimal_ull(m, " ", mm->arg_end); 633 seq_put_decimal_ull(m, " ", mm->env_start); 634 seq_put_decimal_ull(m, " ", mm->env_end); 635 } else 636 seq_puts(m, " 0 0 0 0 0 0 0"); 637 638 if (permitted) 639 seq_put_decimal_ll(m, " ", exit_code); 640 else 641 seq_puts(m, " 0"); 642 643 seq_putc(m, '\n'); 644 if (mm) 645 mmput(mm); 646 return 0; 647 } 648 649 int proc_tid_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, 0); 653 } 654 655 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 656 struct pid *pid, struct task_struct *task) 657 { 658 return do_task_stat(m, ns, pid, task, 1); 659 } 660 661 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 662 struct pid *pid, struct task_struct *task) 663 { 664 struct mm_struct *mm = get_task_mm(task); 665 666 if (mm) { 667 unsigned long size; 668 unsigned long resident = 0; 669 unsigned long shared = 0; 670 unsigned long text = 0; 671 unsigned long data = 0; 672 673 size = task_statm(mm, &shared, &text, &data, &resident); 674 mmput(mm); 675 676 /* 677 * For quick read, open code by putting numbers directly 678 * expected format is 679 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 680 * size, resident, shared, text, data); 681 */ 682 seq_put_decimal_ull(m, "", size); 683 seq_put_decimal_ull(m, " ", resident); 684 seq_put_decimal_ull(m, " ", shared); 685 seq_put_decimal_ull(m, " ", text); 686 seq_put_decimal_ull(m, " ", 0); 687 seq_put_decimal_ull(m, " ", data); 688 seq_put_decimal_ull(m, " ", 0); 689 seq_putc(m, '\n'); 690 } else { 691 seq_write(m, "0 0 0 0 0 0 0\n", 14); 692 } 693 return 0; 694 } 695 696 #ifdef CONFIG_PROC_CHILDREN 697 static struct pid * 698 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 699 { 700 struct task_struct *start, *task; 701 struct pid *pid = NULL; 702 703 read_lock(&tasklist_lock); 704 705 start = pid_task(proc_pid(inode), PIDTYPE_PID); 706 if (!start) 707 goto out; 708 709 /* 710 * Lets try to continue searching first, this gives 711 * us significant speedup on children-rich processes. 712 */ 713 if (pid_prev) { 714 task = pid_task(pid_prev, PIDTYPE_PID); 715 if (task && task->real_parent == start && 716 !(list_empty(&task->sibling))) { 717 if (list_is_last(&task->sibling, &start->children)) 718 goto out; 719 task = list_first_entry(&task->sibling, 720 struct task_struct, sibling); 721 pid = get_pid(task_pid(task)); 722 goto out; 723 } 724 } 725 726 /* 727 * Slow search case. 728 * 729 * We might miss some children here if children 730 * are exited while we were not holding the lock, 731 * but it was never promised to be accurate that 732 * much. 733 * 734 * "Just suppose that the parent sleeps, but N children 735 * exit after we printed their tids. Now the slow paths 736 * skips N extra children, we miss N tasks." (c) 737 * 738 * So one need to stop or freeze the leader and all 739 * its children to get a precise result. 740 */ 741 list_for_each_entry(task, &start->children, sibling) { 742 if (pos-- == 0) { 743 pid = get_pid(task_pid(task)); 744 break; 745 } 746 } 747 748 out: 749 read_unlock(&tasklist_lock); 750 return pid; 751 } 752 753 static int children_seq_show(struct seq_file *seq, void *v) 754 { 755 struct inode *inode = file_inode(seq->file); 756 757 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 758 return 0; 759 } 760 761 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 762 { 763 return get_children_pid(file_inode(seq->file), NULL, *pos); 764 } 765 766 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 767 { 768 struct pid *pid; 769 770 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 771 put_pid(v); 772 773 ++*pos; 774 return pid; 775 } 776 777 static void children_seq_stop(struct seq_file *seq, void *v) 778 { 779 put_pid(v); 780 } 781 782 static const struct seq_operations children_seq_ops = { 783 .start = children_seq_start, 784 .next = children_seq_next, 785 .stop = children_seq_stop, 786 .show = children_seq_show, 787 }; 788 789 static int children_seq_open(struct inode *inode, struct file *file) 790 { 791 return seq_open(file, &children_seq_ops); 792 } 793 794 const struct file_operations proc_tid_children_operations = { 795 .open = children_seq_open, 796 .read = seq_read, 797 .llseek = seq_lseek, 798 .release = seq_release, 799 }; 800 #endif /* CONFIG_PROC_CHILDREN */ 801