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 *buf; 102 size_t size; 103 char tcomm[64]; 104 int ret; 105 106 if (p->flags & PF_WQ_WORKER) 107 wq_worker_comm(tcomm, sizeof(tcomm), p); 108 else 109 __get_task_comm(tcomm, sizeof(tcomm), p); 110 111 size = seq_get_buf(m, &buf); 112 if (escape) { 113 ret = string_escape_str(tcomm, buf, size, 114 ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 115 if (ret >= size) 116 ret = -1; 117 } else { 118 ret = strscpy(buf, tcomm, size); 119 } 120 121 seq_commit(m, ret); 122 } 123 124 /* 125 * The task state array is a strange "bitmap" of 126 * reasons to sleep. Thus "running" is zero, and 127 * you can test for combinations of others with 128 * simple bit tests. 129 */ 130 static const char * const task_state_array[] = { 131 132 /* states in TASK_REPORT: */ 133 "R (running)", /* 0x00 */ 134 "S (sleeping)", /* 0x01 */ 135 "D (disk sleep)", /* 0x02 */ 136 "T (stopped)", /* 0x04 */ 137 "t (tracing stop)", /* 0x08 */ 138 "X (dead)", /* 0x10 */ 139 "Z (zombie)", /* 0x20 */ 140 "P (parked)", /* 0x40 */ 141 142 /* states beyond TASK_REPORT: */ 143 "I (idle)", /* 0x80 */ 144 }; 145 146 static inline const char *get_task_state(struct task_struct *tsk) 147 { 148 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 149 return task_state_array[task_state_index(tsk)]; 150 } 151 152 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 153 struct pid *pid, struct task_struct *p) 154 { 155 struct user_namespace *user_ns = seq_user_ns(m); 156 struct group_info *group_info; 157 int g, umask = -1; 158 struct task_struct *tracer; 159 const struct cred *cred; 160 pid_t ppid, tpid = 0, tgid, ngid; 161 unsigned int max_fds = 0; 162 163 rcu_read_lock(); 164 ppid = pid_alive(p) ? 165 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 166 167 tracer = ptrace_parent(p); 168 if (tracer) 169 tpid = task_pid_nr_ns(tracer, ns); 170 171 tgid = task_tgid_nr_ns(p, ns); 172 ngid = task_numa_group_id(p); 173 cred = get_task_cred(p); 174 175 task_lock(p); 176 if (p->fs) 177 umask = p->fs->umask; 178 if (p->files) 179 max_fds = files_fdtable(p->files)->max_fds; 180 task_unlock(p); 181 rcu_read_unlock(); 182 183 if (umask >= 0) 184 seq_printf(m, "Umask:\t%#04o\n", umask); 185 seq_puts(m, "State:\t"); 186 seq_puts(m, get_task_state(p)); 187 188 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 189 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 190 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 191 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 192 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 193 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 194 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 195 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 196 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 197 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 198 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 199 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 200 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 201 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 202 203 seq_puts(m, "\nGroups:\t"); 204 group_info = cred->group_info; 205 for (g = 0; g < group_info->ngroups; g++) 206 seq_put_decimal_ull(m, g ? " " : "", 207 from_kgid_munged(user_ns, group_info->gid[g])); 208 put_cred(cred); 209 /* Trailing space shouldn't have been added in the first place. */ 210 seq_putc(m, ' '); 211 212 #ifdef CONFIG_PID_NS 213 seq_puts(m, "\nNStgid:"); 214 for (g = ns->level; g <= pid->level; g++) 215 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 216 seq_puts(m, "\nNSpid:"); 217 for (g = ns->level; g <= pid->level; g++) 218 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 219 seq_puts(m, "\nNSpgid:"); 220 for (g = ns->level; g <= pid->level; g++) 221 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 222 seq_puts(m, "\nNSsid:"); 223 for (g = ns->level; g <= pid->level; g++) 224 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 225 #endif 226 seq_putc(m, '\n'); 227 } 228 229 void render_sigset_t(struct seq_file *m, const char *header, 230 sigset_t *set) 231 { 232 int i; 233 234 seq_puts(m, header); 235 236 i = _NSIG; 237 do { 238 int x = 0; 239 240 i -= 4; 241 if (sigismember(set, i+1)) x |= 1; 242 if (sigismember(set, i+2)) x |= 2; 243 if (sigismember(set, i+3)) x |= 4; 244 if (sigismember(set, i+4)) x |= 8; 245 seq_putc(m, hex_asc[x]); 246 } while (i >= 4); 247 248 seq_putc(m, '\n'); 249 } 250 251 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 252 sigset_t *sigcatch) 253 { 254 struct k_sigaction *k; 255 int i; 256 257 k = p->sighand->action; 258 for (i = 1; i <= _NSIG; ++i, ++k) { 259 if (k->sa.sa_handler == SIG_IGN) 260 sigaddset(sigign, i); 261 else if (k->sa.sa_handler != SIG_DFL) 262 sigaddset(sigcatch, i); 263 } 264 } 265 266 static inline void task_sig(struct seq_file *m, struct task_struct *p) 267 { 268 unsigned long flags; 269 sigset_t pending, shpending, blocked, ignored, caught; 270 int num_threads = 0; 271 unsigned int qsize = 0; 272 unsigned long qlim = 0; 273 274 sigemptyset(&pending); 275 sigemptyset(&shpending); 276 sigemptyset(&blocked); 277 sigemptyset(&ignored); 278 sigemptyset(&caught); 279 280 if (lock_task_sighand(p, &flags)) { 281 pending = p->pending.signal; 282 shpending = p->signal->shared_pending.signal; 283 blocked = p->blocked; 284 collect_sigign_sigcatch(p, &ignored, &caught); 285 num_threads = get_nr_threads(p); 286 rcu_read_lock(); /* FIXME: is this correct? */ 287 qsize = get_ucounts_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING); 288 rcu_read_unlock(); 289 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 290 unlock_task_sighand(p, &flags); 291 } 292 293 seq_put_decimal_ull(m, "Threads:\t", num_threads); 294 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 295 seq_put_decimal_ull(m, "/", qlim); 296 297 /* render them all */ 298 render_sigset_t(m, "\nSigPnd:\t", &pending); 299 render_sigset_t(m, "ShdPnd:\t", &shpending); 300 render_sigset_t(m, "SigBlk:\t", &blocked); 301 render_sigset_t(m, "SigIgn:\t", &ignored); 302 render_sigset_t(m, "SigCgt:\t", &caught); 303 } 304 305 static void render_cap_t(struct seq_file *m, const char *header, 306 kernel_cap_t *a) 307 { 308 unsigned __capi; 309 310 seq_puts(m, header); 311 CAP_FOR_EACH_U32(__capi) { 312 seq_put_hex_ll(m, NULL, 313 a->cap[CAP_LAST_U32 - __capi], 8); 314 } 315 seq_putc(m, '\n'); 316 } 317 318 static inline void task_cap(struct seq_file *m, struct task_struct *p) 319 { 320 const struct cred *cred; 321 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 322 cap_bset, cap_ambient; 323 324 rcu_read_lock(); 325 cred = __task_cred(p); 326 cap_inheritable = cred->cap_inheritable; 327 cap_permitted = cred->cap_permitted; 328 cap_effective = cred->cap_effective; 329 cap_bset = cred->cap_bset; 330 cap_ambient = cred->cap_ambient; 331 rcu_read_unlock(); 332 333 render_cap_t(m, "CapInh:\t", &cap_inheritable); 334 render_cap_t(m, "CapPrm:\t", &cap_permitted); 335 render_cap_t(m, "CapEff:\t", &cap_effective); 336 render_cap_t(m, "CapBnd:\t", &cap_bset); 337 render_cap_t(m, "CapAmb:\t", &cap_ambient); 338 } 339 340 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 341 { 342 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 343 #ifdef CONFIG_SECCOMP 344 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 345 #ifdef CONFIG_SECCOMP_FILTER 346 seq_put_decimal_ull(m, "\nSeccomp_filters:\t", 347 atomic_read(&p->seccomp.filter_count)); 348 #endif 349 #endif 350 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 351 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 352 case -EINVAL: 353 seq_puts(m, "unknown"); 354 break; 355 case PR_SPEC_NOT_AFFECTED: 356 seq_puts(m, "not vulnerable"); 357 break; 358 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 359 seq_puts(m, "thread force mitigated"); 360 break; 361 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 362 seq_puts(m, "thread mitigated"); 363 break; 364 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 365 seq_puts(m, "thread vulnerable"); 366 break; 367 case PR_SPEC_DISABLE: 368 seq_puts(m, "globally mitigated"); 369 break; 370 default: 371 seq_puts(m, "vulnerable"); 372 break; 373 } 374 375 seq_puts(m, "\nSpeculationIndirectBranch:\t"); 376 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) { 377 case -EINVAL: 378 seq_puts(m, "unsupported"); 379 break; 380 case PR_SPEC_NOT_AFFECTED: 381 seq_puts(m, "not affected"); 382 break; 383 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 384 seq_puts(m, "conditional force disabled"); 385 break; 386 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 387 seq_puts(m, "conditional disabled"); 388 break; 389 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 390 seq_puts(m, "conditional enabled"); 391 break; 392 case PR_SPEC_ENABLE: 393 seq_puts(m, "always enabled"); 394 break; 395 case PR_SPEC_DISABLE: 396 seq_puts(m, "always disabled"); 397 break; 398 default: 399 seq_puts(m, "unknown"); 400 break; 401 } 402 seq_putc(m, '\n'); 403 } 404 405 static inline void task_context_switch_counts(struct seq_file *m, 406 struct task_struct *p) 407 { 408 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 409 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 410 seq_putc(m, '\n'); 411 } 412 413 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 414 { 415 seq_printf(m, "Cpus_allowed:\t%*pb\n", 416 cpumask_pr_args(&task->cpus_mask)); 417 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 418 cpumask_pr_args(&task->cpus_mask)); 419 } 420 421 static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm) 422 { 423 seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state); 424 seq_putc(m, '\n'); 425 } 426 427 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 428 { 429 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 430 431 if (thp_enabled) 432 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags); 433 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 434 } 435 436 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 437 struct pid *pid, struct task_struct *task) 438 { 439 struct mm_struct *mm = get_task_mm(task); 440 441 seq_puts(m, "Name:\t"); 442 proc_task_name(m, task, true); 443 seq_putc(m, '\n'); 444 445 task_state(m, ns, pid, task); 446 447 if (mm) { 448 task_mem(m, mm); 449 task_core_dumping(m, mm); 450 task_thp_status(m, mm); 451 mmput(mm); 452 } 453 task_sig(m, task); 454 task_cap(m, task); 455 task_seccomp(m, task); 456 task_cpus_allowed(m, task); 457 cpuset_task_status_allowed(m, task); 458 task_context_switch_counts(m, task); 459 return 0; 460 } 461 462 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 463 struct pid *pid, struct task_struct *task, int whole) 464 { 465 unsigned long vsize, eip, esp, wchan = 0; 466 int priority, nice; 467 int tty_pgrp = -1, tty_nr = 0; 468 sigset_t sigign, sigcatch; 469 char state; 470 pid_t ppid = 0, pgid = -1, sid = -1; 471 int num_threads = 0; 472 int permitted; 473 struct mm_struct *mm; 474 unsigned long long start_time; 475 unsigned long cmin_flt = 0, cmaj_flt = 0; 476 unsigned long min_flt = 0, maj_flt = 0; 477 u64 cutime, cstime, utime, stime; 478 u64 cgtime, gtime; 479 unsigned long rsslim = 0; 480 unsigned long flags; 481 482 state = *get_task_state(task); 483 vsize = eip = esp = 0; 484 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 485 mm = get_task_mm(task); 486 if (mm) { 487 vsize = task_vsize(mm); 488 /* 489 * esp and eip are intentionally zeroed out. There is no 490 * non-racy way to read them without freezing the task. 491 * Programs that need reliable values can use ptrace(2). 492 * 493 * The only exception is if the task is core dumping because 494 * a program is not able to use ptrace(2) in that case. It is 495 * safe because the task has stopped executing permanently. 496 */ 497 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 498 if (try_get_task_stack(task)) { 499 eip = KSTK_EIP(task); 500 esp = KSTK_ESP(task); 501 put_task_stack(task); 502 } 503 } 504 } 505 506 sigemptyset(&sigign); 507 sigemptyset(&sigcatch); 508 cutime = cstime = utime = stime = 0; 509 cgtime = gtime = 0; 510 511 if (lock_task_sighand(task, &flags)) { 512 struct signal_struct *sig = task->signal; 513 514 if (sig->tty) { 515 struct pid *pgrp = tty_get_pgrp(sig->tty); 516 tty_pgrp = pid_nr_ns(pgrp, ns); 517 put_pid(pgrp); 518 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 519 } 520 521 num_threads = get_nr_threads(task); 522 collect_sigign_sigcatch(task, &sigign, &sigcatch); 523 524 cmin_flt = sig->cmin_flt; 525 cmaj_flt = sig->cmaj_flt; 526 cutime = sig->cutime; 527 cstime = sig->cstime; 528 cgtime = sig->cgtime; 529 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 530 531 /* add up live thread stats at the group level */ 532 if (whole) { 533 struct task_struct *t = task; 534 do { 535 min_flt += t->min_flt; 536 maj_flt += t->maj_flt; 537 gtime += task_gtime(t); 538 } while_each_thread(task, t); 539 540 min_flt += sig->min_flt; 541 maj_flt += sig->maj_flt; 542 thread_group_cputime_adjusted(task, &utime, &stime); 543 gtime += sig->gtime; 544 } 545 546 sid = task_session_nr_ns(task, ns); 547 ppid = task_tgid_nr_ns(task->real_parent, ns); 548 pgid = task_pgrp_nr_ns(task, ns); 549 550 unlock_task_sighand(task, &flags); 551 } 552 553 if (permitted && (!whole || num_threads < 2)) 554 wchan = get_wchan(task); 555 if (!whole) { 556 min_flt = task->min_flt; 557 maj_flt = task->maj_flt; 558 task_cputime_adjusted(task, &utime, &stime); 559 gtime = task_gtime(task); 560 } 561 562 /* scale priority and nice values from timeslices to -20..20 */ 563 /* to make it look like a "normal" Unix priority/nice value */ 564 priority = task_prio(task); 565 nice = task_nice(task); 566 567 /* apply timens offset for boottime and convert nsec -> ticks */ 568 start_time = 569 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime)); 570 571 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 572 seq_puts(m, " ("); 573 proc_task_name(m, task, false); 574 seq_puts(m, ") "); 575 seq_putc(m, state); 576 seq_put_decimal_ll(m, " ", ppid); 577 seq_put_decimal_ll(m, " ", pgid); 578 seq_put_decimal_ll(m, " ", sid); 579 seq_put_decimal_ll(m, " ", tty_nr); 580 seq_put_decimal_ll(m, " ", tty_pgrp); 581 seq_put_decimal_ull(m, " ", task->flags); 582 seq_put_decimal_ull(m, " ", min_flt); 583 seq_put_decimal_ull(m, " ", cmin_flt); 584 seq_put_decimal_ull(m, " ", maj_flt); 585 seq_put_decimal_ull(m, " ", cmaj_flt); 586 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 587 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 588 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 589 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 590 seq_put_decimal_ll(m, " ", priority); 591 seq_put_decimal_ll(m, " ", nice); 592 seq_put_decimal_ll(m, " ", num_threads); 593 seq_put_decimal_ull(m, " ", 0); 594 seq_put_decimal_ull(m, " ", start_time); 595 seq_put_decimal_ull(m, " ", vsize); 596 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 597 seq_put_decimal_ull(m, " ", rsslim); 598 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 599 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 600 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 601 seq_put_decimal_ull(m, " ", esp); 602 seq_put_decimal_ull(m, " ", eip); 603 /* The signal information here is obsolete. 604 * It must be decimal for Linux 2.0 compatibility. 605 * Use /proc/#/status for real-time signals. 606 */ 607 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 608 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 609 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 610 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 611 612 /* 613 * We used to output the absolute kernel address, but that's an 614 * information leak - so instead we show a 0/1 flag here, to signal 615 * to user-space whether there's a wchan field in /proc/PID/wchan. 616 * 617 * This works with older implementations of procps as well. 618 */ 619 if (wchan) 620 seq_puts(m, " 1"); 621 else 622 seq_puts(m, " 0"); 623 624 seq_put_decimal_ull(m, " ", 0); 625 seq_put_decimal_ull(m, " ", 0); 626 seq_put_decimal_ll(m, " ", task->exit_signal); 627 seq_put_decimal_ll(m, " ", task_cpu(task)); 628 seq_put_decimal_ull(m, " ", task->rt_priority); 629 seq_put_decimal_ull(m, " ", task->policy); 630 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 631 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 632 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 633 634 if (mm && permitted) { 635 seq_put_decimal_ull(m, " ", mm->start_data); 636 seq_put_decimal_ull(m, " ", mm->end_data); 637 seq_put_decimal_ull(m, " ", mm->start_brk); 638 seq_put_decimal_ull(m, " ", mm->arg_start); 639 seq_put_decimal_ull(m, " ", mm->arg_end); 640 seq_put_decimal_ull(m, " ", mm->env_start); 641 seq_put_decimal_ull(m, " ", mm->env_end); 642 } else 643 seq_puts(m, " 0 0 0 0 0 0 0"); 644 645 if (permitted) 646 seq_put_decimal_ll(m, " ", task->exit_code); 647 else 648 seq_puts(m, " 0"); 649 650 seq_putc(m, '\n'); 651 if (mm) 652 mmput(mm); 653 return 0; 654 } 655 656 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 657 struct pid *pid, struct task_struct *task) 658 { 659 return do_task_stat(m, ns, pid, task, 0); 660 } 661 662 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 663 struct pid *pid, struct task_struct *task) 664 { 665 return do_task_stat(m, ns, pid, task, 1); 666 } 667 668 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 669 struct pid *pid, struct task_struct *task) 670 { 671 struct mm_struct *mm = get_task_mm(task); 672 673 if (mm) { 674 unsigned long size; 675 unsigned long resident = 0; 676 unsigned long shared = 0; 677 unsigned long text = 0; 678 unsigned long data = 0; 679 680 size = task_statm(mm, &shared, &text, &data, &resident); 681 mmput(mm); 682 683 /* 684 * For quick read, open code by putting numbers directly 685 * expected format is 686 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 687 * size, resident, shared, text, data); 688 */ 689 seq_put_decimal_ull(m, "", size); 690 seq_put_decimal_ull(m, " ", resident); 691 seq_put_decimal_ull(m, " ", shared); 692 seq_put_decimal_ull(m, " ", text); 693 seq_put_decimal_ull(m, " ", 0); 694 seq_put_decimal_ull(m, " ", data); 695 seq_put_decimal_ull(m, " ", 0); 696 seq_putc(m, '\n'); 697 } else { 698 seq_write(m, "0 0 0 0 0 0 0\n", 14); 699 } 700 return 0; 701 } 702 703 #ifdef CONFIG_PROC_CHILDREN 704 static struct pid * 705 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 706 { 707 struct task_struct *start, *task; 708 struct pid *pid = NULL; 709 710 read_lock(&tasklist_lock); 711 712 start = pid_task(proc_pid(inode), PIDTYPE_PID); 713 if (!start) 714 goto out; 715 716 /* 717 * Lets try to continue searching first, this gives 718 * us significant speedup on children-rich processes. 719 */ 720 if (pid_prev) { 721 task = pid_task(pid_prev, PIDTYPE_PID); 722 if (task && task->real_parent == start && 723 !(list_empty(&task->sibling))) { 724 if (list_is_last(&task->sibling, &start->children)) 725 goto out; 726 task = list_first_entry(&task->sibling, 727 struct task_struct, sibling); 728 pid = get_pid(task_pid(task)); 729 goto out; 730 } 731 } 732 733 /* 734 * Slow search case. 735 * 736 * We might miss some children here if children 737 * are exited while we were not holding the lock, 738 * but it was never promised to be accurate that 739 * much. 740 * 741 * "Just suppose that the parent sleeps, but N children 742 * exit after we printed their tids. Now the slow paths 743 * skips N extra children, we miss N tasks." (c) 744 * 745 * So one need to stop or freeze the leader and all 746 * its children to get a precise result. 747 */ 748 list_for_each_entry(task, &start->children, sibling) { 749 if (pos-- == 0) { 750 pid = get_pid(task_pid(task)); 751 break; 752 } 753 } 754 755 out: 756 read_unlock(&tasklist_lock); 757 return pid; 758 } 759 760 static int children_seq_show(struct seq_file *seq, void *v) 761 { 762 struct inode *inode = file_inode(seq->file); 763 764 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 765 return 0; 766 } 767 768 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 769 { 770 return get_children_pid(file_inode(seq->file), NULL, *pos); 771 } 772 773 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 774 { 775 struct pid *pid; 776 777 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 778 put_pid(v); 779 780 ++*pos; 781 return pid; 782 } 783 784 static void children_seq_stop(struct seq_file *seq, void *v) 785 { 786 put_pid(v); 787 } 788 789 static const struct seq_operations children_seq_ops = { 790 .start = children_seq_start, 791 .next = children_seq_next, 792 .stop = children_seq_stop, 793 .show = children_seq_show, 794 }; 795 796 static int children_seq_open(struct inode *inode, struct file *file) 797 { 798 return seq_open(file, &children_seq_ops); 799 } 800 801 const struct file_operations proc_tid_children_operations = { 802 .open = children_seq_open, 803 .read = seq_read, 804 .llseek = seq_lseek, 805 .release = seq_release, 806 }; 807 #endif /* CONFIG_PROC_CHILDREN */ 808