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 * <[email protected]> 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 * <[email protected]> 17 * 18 * Danny ter Haar : added cpuinfo 19 * <[email protected]> 20 * 21 * Alessandro Rubini : profile extension. 22 * <[email protected]> 23 * 24 * Jeff Tranter : added BogoMips field to cpuinfo 25 * <[email protected]> 26 * 27 * Bruno Haible : remove 4K limit for the maps file 28 * <[email protected]> 29 * 30 * Yves Arrouye : remove removal of trailing spaces in get_array. 31 * <[email protected]> 32 * 33 * Jerome Forissier : added per-CPU time information to /proc/stat 34 * and /proc/<pid>/cpu extension 35 * <[email protected]> 36 * - Incorporation and non-SMP safe operation 37 * of forissier patch in 2.1.78 by 38 * Hans Marcus <[email protected]> 39 * 40 * [email protected] : /proc/partitions 41 * 42 * 43 * Alan Cox : security fixes. 44 * <[email protected]> 45 * 46 * Al Viro : safe handling of mm_struct 47 * 48 * Gerhard Wichert : added BIGMEM support 49 * Siemens AG <[email protected]> 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 } 224 225 void render_sigset_t(struct seq_file *m, const char *header, 226 sigset_t *set) 227 { 228 int i; 229 230 seq_puts(m, header); 231 232 i = _NSIG; 233 do { 234 int x = 0; 235 236 i -= 4; 237 if (sigismember(set, i+1)) x |= 1; 238 if (sigismember(set, i+2)) x |= 2; 239 if (sigismember(set, i+3)) x |= 4; 240 if (sigismember(set, i+4)) x |= 8; 241 seq_putc(m, hex_asc[x]); 242 } while (i >= 4); 243 244 seq_putc(m, '\n'); 245 } 246 247 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 248 sigset_t *sigcatch) 249 { 250 struct k_sigaction *k; 251 int i; 252 253 k = p->sighand->action; 254 for (i = 1; i <= _NSIG; ++i, ++k) { 255 if (k->sa.sa_handler == SIG_IGN) 256 sigaddset(sigign, i); 257 else if (k->sa.sa_handler != SIG_DFL) 258 sigaddset(sigcatch, i); 259 } 260 } 261 262 static inline void task_sig(struct seq_file *m, struct task_struct *p) 263 { 264 unsigned long flags; 265 sigset_t pending, shpending, blocked, ignored, caught; 266 int num_threads = 0; 267 unsigned int qsize = 0; 268 unsigned long qlim = 0; 269 270 sigemptyset(&pending); 271 sigemptyset(&shpending); 272 sigemptyset(&blocked); 273 sigemptyset(&ignored); 274 sigemptyset(&caught); 275 276 if (lock_task_sighand(p, &flags)) { 277 pending = p->pending.signal; 278 shpending = p->signal->shared_pending.signal; 279 blocked = p->blocked; 280 collect_sigign_sigcatch(p, &ignored, &caught); 281 num_threads = get_nr_threads(p); 282 rcu_read_lock(); /* FIXME: is this correct? */ 283 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 284 rcu_read_unlock(); 285 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 286 unlock_task_sighand(p, &flags); 287 } 288 289 seq_put_decimal_ull(m, "Threads:\t", num_threads); 290 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 291 seq_put_decimal_ull(m, "/", qlim); 292 293 /* render them all */ 294 render_sigset_t(m, "\nSigPnd:\t", &pending); 295 render_sigset_t(m, "ShdPnd:\t", &shpending); 296 render_sigset_t(m, "SigBlk:\t", &blocked); 297 render_sigset_t(m, "SigIgn:\t", &ignored); 298 render_sigset_t(m, "SigCgt:\t", &caught); 299 } 300 301 static void render_cap_t(struct seq_file *m, const char *header, 302 kernel_cap_t *a) 303 { 304 seq_puts(m, header); 305 seq_put_hex_ll(m, NULL, a->val, 16); 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 static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm) 428 { 429 seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm)); 430 } 431 432 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 433 struct pid *pid, struct task_struct *task) 434 { 435 struct mm_struct *mm = get_task_mm(task); 436 437 seq_puts(m, "Name:\t"); 438 proc_task_name(m, task, true); 439 seq_putc(m, '\n'); 440 441 task_state(m, ns, pid, task); 442 443 if (mm) { 444 task_mem(m, mm); 445 task_core_dumping(m, task); 446 task_thp_status(m, mm); 447 task_untag_mask(m, mm); 448 mmput(mm); 449 } 450 task_sig(m, task); 451 task_cap(m, task); 452 task_seccomp(m, task); 453 task_cpus_allowed(m, task); 454 cpuset_task_status_allowed(m, task); 455 task_context_switch_counts(m, task); 456 return 0; 457 } 458 459 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 460 struct pid *pid, struct task_struct *task, int whole) 461 { 462 unsigned long vsize, eip, esp, wchan = 0; 463 int priority, nice; 464 int tty_pgrp = -1, tty_nr = 0; 465 sigset_t sigign, sigcatch; 466 char state; 467 pid_t ppid = 0, pgid = -1, sid = -1; 468 int num_threads = 0; 469 int permitted; 470 struct mm_struct *mm; 471 unsigned long long start_time; 472 unsigned long cmin_flt = 0, cmaj_flt = 0; 473 unsigned long min_flt = 0, maj_flt = 0; 474 u64 cutime, cstime, utime, stime; 475 u64 cgtime, gtime; 476 unsigned long rsslim = 0; 477 unsigned long flags; 478 int exit_code = task->exit_code; 479 480 state = *get_task_state(task); 481 vsize = eip = esp = 0; 482 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 483 mm = get_task_mm(task); 484 if (mm) { 485 vsize = task_vsize(mm); 486 /* 487 * esp and eip are intentionally zeroed out. There is no 488 * non-racy way to read them without freezing the task. 489 * Programs that need reliable values can use ptrace(2). 490 * 491 * The only exception is if the task is core dumping because 492 * a program is not able to use ptrace(2) in that case. It is 493 * safe because the task has stopped executing permanently. 494 */ 495 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 496 if (try_get_task_stack(task)) { 497 eip = KSTK_EIP(task); 498 esp = KSTK_ESP(task); 499 put_task_stack(task); 500 } 501 } 502 } 503 504 sigemptyset(&sigign); 505 sigemptyset(&sigcatch); 506 cutime = cstime = utime = stime = 0; 507 cgtime = gtime = 0; 508 509 if (lock_task_sighand(task, &flags)) { 510 struct signal_struct *sig = task->signal; 511 512 if (sig->tty) { 513 struct pid *pgrp = tty_get_pgrp(sig->tty); 514 tty_pgrp = pid_nr_ns(pgrp, ns); 515 put_pid(pgrp); 516 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 517 } 518 519 num_threads = get_nr_threads(task); 520 collect_sigign_sigcatch(task, &sigign, &sigcatch); 521 522 cmin_flt = sig->cmin_flt; 523 cmaj_flt = sig->cmaj_flt; 524 cutime = sig->cutime; 525 cstime = sig->cstime; 526 cgtime = sig->cgtime; 527 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 528 529 /* add up live thread stats at the group level */ 530 if (whole) { 531 struct task_struct *t = task; 532 do { 533 min_flt += t->min_flt; 534 maj_flt += t->maj_flt; 535 gtime += task_gtime(t); 536 } while_each_thread(task, t); 537 538 min_flt += sig->min_flt; 539 maj_flt += sig->maj_flt; 540 thread_group_cputime_adjusted(task, &utime, &stime); 541 gtime += sig->gtime; 542 543 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED)) 544 exit_code = sig->group_exit_code; 545 } 546 547 sid = task_session_nr_ns(task, ns); 548 ppid = task_tgid_nr_ns(task->real_parent, ns); 549 pgid = task_pgrp_nr_ns(task, ns); 550 551 unlock_task_sighand(task, &flags); 552 } 553 554 if (permitted && (!whole || num_threads < 2)) 555 wchan = !task_is_running(task); 556 if (!whole) { 557 min_flt = task->min_flt; 558 maj_flt = task->maj_flt; 559 task_cputime_adjusted(task, &utime, &stime); 560 gtime = task_gtime(task); 561 } 562 563 /* scale priority and nice values from timeslices to -20..20 */ 564 /* to make it look like a "normal" Unix priority/nice value */ 565 priority = task_prio(task); 566 nice = task_nice(task); 567 568 /* apply timens offset for boottime and convert nsec -> ticks */ 569 start_time = 570 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 571 572 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 573 seq_puts(m, " ("); 574 proc_task_name(m, task, false); 575 seq_puts(m, ") "); 576 seq_putc(m, state); 577 seq_put_decimal_ll(m, " ", ppid); 578 seq_put_decimal_ll(m, " ", pgid); 579 seq_put_decimal_ll(m, " ", sid); 580 seq_put_decimal_ll(m, " ", tty_nr); 581 seq_put_decimal_ll(m, " ", tty_pgrp); 582 seq_put_decimal_ull(m, " ", task->flags); 583 seq_put_decimal_ull(m, " ", min_flt); 584 seq_put_decimal_ull(m, " ", cmin_flt); 585 seq_put_decimal_ull(m, " ", maj_flt); 586 seq_put_decimal_ull(m, " ", cmaj_flt); 587 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 588 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 589 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 590 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 591 seq_put_decimal_ll(m, " ", priority); 592 seq_put_decimal_ll(m, " ", nice); 593 seq_put_decimal_ll(m, " ", num_threads); 594 seq_put_decimal_ull(m, " ", 0); 595 seq_put_decimal_ull(m, " ", start_time); 596 seq_put_decimal_ull(m, " ", vsize); 597 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 598 seq_put_decimal_ull(m, " ", rsslim); 599 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 600 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 601 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 602 seq_put_decimal_ull(m, " ", esp); 603 seq_put_decimal_ull(m, " ", eip); 604 /* The signal information here is obsolete. 605 * It must be decimal for Linux 2.0 compatibility. 606 * Use /proc/#/status for real-time signals. 607 */ 608 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 609 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 610 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 611 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 612 613 /* 614 * We used to output the absolute kernel address, but that's an 615 * information leak - so instead we show a 0/1 flag here, to signal 616 * to user-space whether there's a wchan field in /proc/PID/wchan. 617 * 618 * This works with older implementations of procps as well. 619 */ 620 seq_put_decimal_ull(m, " ", wchan); 621 622 seq_put_decimal_ull(m, " ", 0); 623 seq_put_decimal_ull(m, " ", 0); 624 seq_put_decimal_ll(m, " ", task->exit_signal); 625 seq_put_decimal_ll(m, " ", task_cpu(task)); 626 seq_put_decimal_ull(m, " ", task->rt_priority); 627 seq_put_decimal_ull(m, " ", task->policy); 628 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 629 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 630 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 631 632 if (mm && permitted) { 633 seq_put_decimal_ull(m, " ", mm->start_data); 634 seq_put_decimal_ull(m, " ", mm->end_data); 635 seq_put_decimal_ull(m, " ", mm->start_brk); 636 seq_put_decimal_ull(m, " ", mm->arg_start); 637 seq_put_decimal_ull(m, " ", mm->arg_end); 638 seq_put_decimal_ull(m, " ", mm->env_start); 639 seq_put_decimal_ull(m, " ", mm->env_end); 640 } else 641 seq_puts(m, " 0 0 0 0 0 0 0"); 642 643 if (permitted) 644 seq_put_decimal_ll(m, " ", exit_code); 645 else 646 seq_puts(m, " 0"); 647 648 seq_putc(m, '\n'); 649 if (mm) 650 mmput(mm); 651 return 0; 652 } 653 654 int proc_tid_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, 0); 658 } 659 660 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 661 struct pid *pid, struct task_struct *task) 662 { 663 return do_task_stat(m, ns, pid, task, 1); 664 } 665 666 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 667 struct pid *pid, struct task_struct *task) 668 { 669 struct mm_struct *mm = get_task_mm(task); 670 671 if (mm) { 672 unsigned long size; 673 unsigned long resident = 0; 674 unsigned long shared = 0; 675 unsigned long text = 0; 676 unsigned long data = 0; 677 678 size = task_statm(mm, &shared, &text, &data, &resident); 679 mmput(mm); 680 681 /* 682 * For quick read, open code by putting numbers directly 683 * expected format is 684 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 685 * size, resident, shared, text, data); 686 */ 687 seq_put_decimal_ull(m, "", size); 688 seq_put_decimal_ull(m, " ", resident); 689 seq_put_decimal_ull(m, " ", shared); 690 seq_put_decimal_ull(m, " ", text); 691 seq_put_decimal_ull(m, " ", 0); 692 seq_put_decimal_ull(m, " ", data); 693 seq_put_decimal_ull(m, " ", 0); 694 seq_putc(m, '\n'); 695 } else { 696 seq_write(m, "0 0 0 0 0 0 0\n", 14); 697 } 698 return 0; 699 } 700 701 #ifdef CONFIG_PROC_CHILDREN 702 static struct pid * 703 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 704 { 705 struct task_struct *start, *task; 706 struct pid *pid = NULL; 707 708 read_lock(&tasklist_lock); 709 710 start = pid_task(proc_pid(inode), PIDTYPE_PID); 711 if (!start) 712 goto out; 713 714 /* 715 * Lets try to continue searching first, this gives 716 * us significant speedup on children-rich processes. 717 */ 718 if (pid_prev) { 719 task = pid_task(pid_prev, PIDTYPE_PID); 720 if (task && task->real_parent == start && 721 !(list_empty(&task->sibling))) { 722 if (list_is_last(&task->sibling, &start->children)) 723 goto out; 724 task = list_first_entry(&task->sibling, 725 struct task_struct, sibling); 726 pid = get_pid(task_pid(task)); 727 goto out; 728 } 729 } 730 731 /* 732 * Slow search case. 733 * 734 * We might miss some children here if children 735 * are exited while we were not holding the lock, 736 * but it was never promised to be accurate that 737 * much. 738 * 739 * "Just suppose that the parent sleeps, but N children 740 * exit after we printed their tids. Now the slow paths 741 * skips N extra children, we miss N tasks." (c) 742 * 743 * So one need to stop or freeze the leader and all 744 * its children to get a precise result. 745 */ 746 list_for_each_entry(task, &start->children, sibling) { 747 if (pos-- == 0) { 748 pid = get_pid(task_pid(task)); 749 break; 750 } 751 } 752 753 out: 754 read_unlock(&tasklist_lock); 755 return pid; 756 } 757 758 static int children_seq_show(struct seq_file *seq, void *v) 759 { 760 struct inode *inode = file_inode(seq->file); 761 762 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 763 return 0; 764 } 765 766 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 767 { 768 return get_children_pid(file_inode(seq->file), NULL, *pos); 769 } 770 771 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 772 { 773 struct pid *pid; 774 775 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 776 put_pid(v); 777 778 ++*pos; 779 return pid; 780 } 781 782 static void children_seq_stop(struct seq_file *seq, void *v) 783 { 784 put_pid(v); 785 } 786 787 static const struct seq_operations children_seq_ops = { 788 .start = children_seq_start, 789 .next = children_seq_next, 790 .stop = children_seq_stop, 791 .show = children_seq_show, 792 }; 793 794 static int children_seq_open(struct inode *inode, struct file *file) 795 { 796 return seq_open(file, &children_seq_ops); 797 } 798 799 const struct file_operations proc_tid_children_operations = { 800 .open = children_seq_open, 801 .read = seq_read, 802 .llseek = seq_lseek, 803 .release = seq_release, 804 }; 805 #endif /* CONFIG_PROC_CHILDREN */ 806