fs/proc/array.c

   1 /*
   2  *  linux/fs/proc/array.c
   3  *
   4  *  Copyright (C) 1992  by Linus Torvalds
   5  *  based on ideas by Darren Senn
   6  *
   7  * Fixes:
   8  * Michael. K. Johnson: stat,statm extensions.
   9  *                      <johnsonm@stolaf.edu>
  10  *
  11  * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
  12  *                      make sure SET_PROCTITLE works. Also removed
  13  *                      bad '!' which forced address recalculation for
  14  *                      EVERY character on the current page.
  15  *                      <middelin@polyware.iaf.nl>
  16  *
  17  * Danny ter Haar    :  added cpuinfo
  18  *                      <dth@cistron.nl>
  19  *
  20  * Alessandro Rubini :  profile extension.
  21  *                      <rubini@ipvvis.unipv.it>
  22  *
  23  * Jeff Tranter      :  added BogoMips field to cpuinfo
  24  *                      <Jeff_Tranter@Mitel.COM>
  25  *
  26  * Bruno Haible      :  remove 4K limit for the maps file
  27  *                      <haible@ma2s2.mathematik.uni-karlsruhe.de>
  28  *
  29  * Yves Arrouye      :  remove removal of trailing spaces in get_array.
  30  *                      <Yves.Arrouye@marin.fdn.fr>
  31  *
  32  * Jerome Forissier  :  added per-CPU time information to /proc/stat
  33  *                      and /proc/<pid>/cpu extension
  34  *                      <forissier@isia.cma.fr>
  35  *                      - Incorporation and non-SMP safe operation
  36  *                      of forissier patch in 2.1.78 by
  37  *                      Hans Marcus <crowbar@concepts.nl>
  38  *
  39  * aeb@cwi.nl        :  /proc/partitions
  40  *
  41  *
  42  * Alan Cox          :  security fixes.
  43  *                      <alan@lxorguk.ukuu.org.uk>
  44  *
  45  * Al Viro           :  safe handling of mm_struct
  46  *
  47  * Gerhard Wichert   :  added BIGMEM support
  48  * Siemens AG           <Gerhard.Wichert@pdb.siemens.de>
  49  *
  50  * Al Viro & Jeff Garzik :  moved most of the thing into base.c and
  51  *                       :  proc_misc.c. The rest may eventually go into
  52  *                       :  base.c too.
  53  */
  54
  55 #include <linux/types.h>
  56 #include <linux/errno.h>
  57 #include <linux/time.h>
  58 #include <linux/kernel.h>
  59 #include <linux/kernel_stat.h>
  60 #include <linux/tty.h>
  61 #include <linux/string.h>
  62 #include <linux/mman.h>
  63 #include <linux/proc_fs.h>
  64 #include <linux/ioport.h>
  65 #include <linux/uaccess.h>
  66 #include <linux/io.h>
  67 #include <linux/mm.h>
  68 #include <linux/hugetlb.h>
  69 #include <linux/pagemap.h>
  70 #include <linux/swap.h>
  71 #include <linux/smp.h>
  72 #include <linux/signal.h>
  73 #include <linux/highmem.h>
  74 #include <linux/file.h>
  75 #include <linux/fdtable.h>
  76 #include <linux/times.h>
  77 #include <linux/cpuset.h>
  78 #include <linux/rcupdate.h>
  79 #include <linux/delayacct.h>
  80 #include <linux/seq_file.h>
  81 #include <linux/pid_namespace.h>
  82 #include <linux/ptrace.h>
  83 #include <linux/tracehook.h>
  84 #include <linux/swapops.h>
  85
  86 #include <asm/pgtable.h>
  87 #include <asm/processor.h>
  88 #include "internal.h"
  89
  90 static inline void task_name(struct seq_file *m, struct task_struct *p)
  91 {
  92         int i;
  93         char *buf, *end;
  94         char *name;
  95         char tcomm[sizeof(p->comm)];
  96
  97         get_task_comm(tcomm, p);
  98
  99         seq_printf(m, "Name:\t");
 100         end = m->buf + m->size;
 101         buf = m->buf + m->count;
 102         name = tcomm;
 103         i = sizeof(tcomm);
 104         while (i && (buf < end)) {
 105                 unsigned char c = *name;
 106                 name++;
 107                 i--;
 108                 *buf = c;
 109                 if (!c)
 110                         break;
 111                 if (c == '\\') {
 112                         buf++;
 113                         if (buf < end)
 114                                 *buf++ = c;
 115                         continue;
 116                 }
 117                 if (c == '\n') {
 118                         *buf++ = '\\';
 119                         if (buf < end)
 120                                 *buf++ = 'n';
 121                         continue;
 122                 }
 123                 buf++;
 124         }
 125         m->count = buf - m->buf;
 126         seq_printf(m, "\n");
 127 }
 128
 129 /*
 130  * The task state array is a strange "bitmap" of
 131  * reasons to sleep. Thus "running" is zero, and
 132  * you can test for combinations of others with
 133  * simple bit tests.
 134  */
 135 static const char *task_state_array[] = {
 136         "R (running)",          /*   0 */
 137         "S (sleeping)",         /*   1 */
 138         "D (disk sleep)",       /*   2 */
 139         "T (stopped)",          /*   4 */
 140         "t (tracing stop)",     /*   8 */
 141         "Z (zombie)",           /*  16 */
 142         "X (dead)",             /*  32 */
 143         "x (dead)",             /*  64 */
 144         "K (wakekill)",         /* 128 */
 145         "W (waking)",           /* 256 */
 146 };
 147
 148 static inline const char *get_task_state(struct task_struct *tsk)
 149 {
 150         unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
 151         const char **p = &task_state_array[0];
 152
 153         BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
 154
 155         while (state) {
 156                 p++;
 157                 state >>= 1;
 158         }
 159         return *p;
 160 }
 161
 162 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 163                                 struct pid *pid, struct task_struct *p)
 164 {
 165         struct group_info *group_info;
 166         int g;
 167         struct fdtable *fdt = NULL;
 168         const struct cred *cred;
 169         pid_t ppid, tpid;
 170
 171         rcu_read_lock();
 172         ppid = pid_alive(p) ?
 173                 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
 174         tpid = 0;
 175         if (pid_alive(p)) {
 176                 struct task_struct *tracer = tracehook_tracer_task(p);
 177                 if (tracer)
 178                         tpid = task_pid_nr_ns(tracer, ns);
 179         }
 180         cred = get_cred((struct cred *) __task_cred(p));
 181         seq_printf(m,
 182                 "State:\t%s\n"
 183                 "Tgid:\t%d\n"
 184                 "Pid:\t%d\n"
 185                 "PPid:\t%d\n"
 186                 "TracerPid:\t%d\n"
 187                 "Uid:\t%d\t%d\t%d\t%d\n"
 188                 "Gid:\t%d\t%d\t%d\t%d\n",
 189                 get_task_state(p),
 190                 task_tgid_nr_ns(p, ns),
 191                 pid_nr_ns(pid, ns),
 192                 ppid, tpid,
 193                 cred->uid, cred->euid, cred->suid, cred->fsuid,
 194                 cred->gid, cred->egid, cred->sgid, cred->fsgid);
 195
 196         task_lock(p);
 197         if (p->files)
 198                 fdt = files_fdtable(p->files);
 199         seq_printf(m,
 200                 "FDSize:\t%d\n"
 201                 "Groups:\t",
 202                 fdt ? fdt->max_fds : 0);
 203         rcu_read_unlock();
 204
 205         group_info = cred->group_info;
 206         task_unlock(p);
 207
 208         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
 209                 seq_printf(m, "%d ", GROUP_AT(group_info, g));
 210         put_cred(cred);
 211
 212         seq_printf(m, "\n");
 213 }
 214
 215 static void render_sigset_t(struct seq_file *m, const char *header,
 216                                 sigset_t *set)
 217 {
 218         int i;
 219
 220         seq_printf(m, "%s", header);
 221
 222         i = _NSIG;
 223         do {
 224                 int x = 0;
 225
 226                 i -= 4;
 227                 if (sigismember(set, i+1)) x |= 1;
 228                 if (sigismember(set, i+2)) x |= 2;
 229                 if (sigismember(set, i+3)) x |= 4;
 230                 if (sigismember(set, i+4)) x |= 8;
 231                 seq_printf(m, "%x", x);
 232         } while (i >= 4);
 233
 234         seq_printf(m, "\n");
 235 }
 236
 237 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 238                                     sigset_t *catch)
 239 {
 240         struct k_sigaction *k;
 241         int i;
 242
 243         k = p->sighand->action;
 244         for (i = 1; i <= _NSIG; ++i, ++k) {
 245                 if (k->sa.sa_handler == SIG_IGN)
 246                         sigaddset(ign, i);
 247                 else if (k->sa.sa_handler != SIG_DFL)
 248                         sigaddset(catch, i);
 249         }
 250 }
 251
 252 static inline void task_sig(struct seq_file *m, struct task_struct *p)
 253 {
 254         unsigned long flags;
 255         sigset_t pending, shpending, blocked, ignored, caught;
 256         int num_threads = 0;
 257         unsigned long qsize = 0;
 258         unsigned long qlim = 0;
 259
 260         sigemptyset(&pending);
 261         sigemptyset(&shpending);
 262         sigemptyset(&blocked);
 263         sigemptyset(&ignored);
 264         sigemptyset(&caught);
 265
 266         if (lock_task_sighand(p, &flags)) {
 267                 pending = p->pending.signal;
 268                 shpending = p->signal->shared_pending.signal;
 269                 blocked = p->blocked;
 270                 collect_sigign_sigcatch(p, &ignored, &caught);
 271                 num_threads = atomic_read(&p->signal->count);
 272                 rcu_read_lock();  /* FIXME: is this correct? */
 273                 qsize = atomic_read(&__task_cred(p)->user->sigpending);
 274                 rcu_read_unlock();
 275                 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
 276                 unlock_task_sighand(p, &flags);
 277         }
 278
 279         seq_printf(m, "Threads:\t%d\n", num_threads);
 280         seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
 281
 282         /* render them all */
 283         render_sigset_t(m, "SigPnd:\t", &pending);
 284         render_sigset_t(m, "ShdPnd:\t", &shpending);
 285         render_sigset_t(m, "SigBlk:\t", &blocked);
 286         render_sigset_t(m, "SigIgn:\t", &ignored);
 287         render_sigset_t(m, "SigCgt:\t", &caught);
 288 }
 289
 290 static void render_cap_t(struct seq_file *m, const char *header,
 291                         kernel_cap_t *a)
 292 {
 293         unsigned __capi;
 294
 295         seq_printf(m, "%s", header);
 296         CAP_FOR_EACH_U32(__capi) {
 297                 seq_printf(m, "%08x",
 298                            a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
 299         }
 300         seq_printf(m, "\n");
 301 }
 302
 303 static inline void task_cap(struct seq_file *m, struct task_struct *p)
 304 {
 305         const struct cred *cred;
 306         kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
 307
 308         rcu_read_lock();
 309         cred = __task_cred(p);
 310         cap_inheritable = cred->cap_inheritable;
 311         cap_permitted   = cred->cap_permitted;
 312         cap_effective   = cred->cap_effective;
 313         cap_bset        = cred->cap_bset;
 314         rcu_read_unlock();
 315
 316         render_cap_t(m, "CapInh:\t", &cap_inheritable);
 317         render_cap_t(m, "CapPrm:\t", &cap_permitted);
 318         render_cap_t(m, "CapEff:\t", &cap_effective);
 319         render_cap_t(m, "CapBnd:\t", &cap_bset);
 320 }
 321
 322 static inline void task_context_switch_counts(struct seq_file *m,
 323                                                 struct task_struct *p)
 324 {
 325         seq_printf(m,   "voluntary_ctxt_switches:\t%lu\n"
 326                         "nonvoluntary_ctxt_switches:\t%lu\n",
 327                         p->nvcsw,
 328                         p->nivcsw);
 329 }
 330
 331 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
 332 {
 333         seq_printf(m, "Cpus_allowed:\t");
 334         seq_cpumask(m, &task->cpus_allowed);
 335         seq_printf(m, "\n");
 336         seq_printf(m, "Cpus_allowed_list:\t");
 337         seq_cpumask_list(m, &task->cpus_allowed);
 338         seq_printf(m, "\n");
 339 }
 340
 341 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 342                         struct pid *pid, struct task_struct *task)
 343 {
 344         struct mm_struct *mm = get_task_mm(task);
 345
 346         task_name(m, task);
 347         task_state(m, ns, pid, task);
 348
 349         if (mm) {
 350                 task_mem(m, mm);
 351                 mmput(mm);
 352         }
 353         task_sig(m, task);
 354         task_cap(m, task);
 355         task_cpus_allowed(m, task);
 356         cpuset_task_status_allowed(m, task);
 357 #if defined(CONFIG_S390)
 358         task_show_regs(m, task);
 359 #endif
 360         task_context_switch_counts(m, task);
 361         return 0;
 362 }
 363
 364 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 365                         struct pid *pid, struct task_struct *task, int whole)
 366 {
 367         unsigned long vsize, eip, esp, wchan = ~0UL;
 368         long priority, nice;
 369         int tty_pgrp = -1, tty_nr = 0;
 370         sigset_t sigign, sigcatch;
 371         char state;
 372         pid_t ppid = 0, pgid = -1, sid = -1;
 373         int num_threads = 0;
 374         int permitted;
 375         struct mm_struct *mm;
 376         unsigned long long start_time;
 377         unsigned long cmin_flt = 0, cmaj_flt = 0;
 378         unsigned long  min_flt = 0,  maj_flt = 0;
 379         cputime_t cutime, cstime, utime, stime;
 380         cputime_t cgtime, gtime;
 381         unsigned long rsslim = 0;
 382         char tcomm[sizeof(task->comm)];
 383         unsigned long flags;
 384
 385         state = *get_task_state(task);
 386         vsize = eip = esp = 0;
 387         permitted = ptrace_may_access(task, PTRACE_MODE_READ);
 388         mm = get_task_mm(task);
 389         if (mm) {
 390                 vsize = task_vsize(mm);
 391                 if (permitted) {
 392                         eip = KSTK_EIP(task);
 393                         esp = KSTK_ESP(task);
 394                 }
 395         }
 396
 397         get_task_comm(tcomm, task);
 398
 399         sigemptyset(&sigign);
 400         sigemptyset(&sigcatch);
 401         cutime = cstime = utime = stime = cputime_zero;
 402         cgtime = gtime = cputime_zero;
 403
 404         if (lock_task_sighand(task, &flags)) {
 405                 struct signal_struct *sig = task->signal;
 406
 407                 if (sig->tty) {
 408                         struct pid *pgrp = tty_get_pgrp(sig->tty);
 409                         tty_pgrp = pid_nr_ns(pgrp, ns);
 410                         put_pid(pgrp);
 411                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 412                 }
 413
 414                 num_threads = atomic_read(&sig->count);
 415                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 416
 417                 cmin_flt = sig->cmin_flt;
 418                 cmaj_flt = sig->cmaj_flt;
 419                 cutime = sig->cutime;
 420                 cstime = sig->cstime;
 421                 cgtime = sig->cgtime;
 422                 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
 423
 424                 /* add up live thread stats at the group level */
 425                 if (whole) {
 426                         struct task_struct *t = task;
 427                         do {
 428                                 min_flt += t->min_flt;
 429                                 maj_flt += t->maj_flt;
 430                                 gtime = cputime_add(gtime, t->gtime);
 431                                 t = next_thread(t);
 432                         } while (t != task);
 433
 434                         min_flt += sig->min_flt;
 435                         maj_flt += sig->maj_flt;
 436                         thread_group_times(task, &utime, &stime);
 437                         gtime = cputime_add(gtime, sig->gtime);
 438                 }
 439
 440                 sid = task_session_nr_ns(task, ns);
 441                 ppid = task_tgid_nr_ns(task->real_parent, ns);
 442                 pgid = task_pgrp_nr_ns(task, ns);
 443
 444                 unlock_task_sighand(task, &flags);
 445         }
 446
 447         if (permitted && (!whole || num_threads < 2))
 448                 wchan = get_wchan(task);
 449         if (!whole) {
 450                 min_flt = task->min_flt;
 451                 maj_flt = task->maj_flt;
 452                 task_times(task, &utime, &stime);
 453                 gtime = task->gtime;
 454         }
 455
 456         /* scale priority and nice values from timeslices to -20..20 */
 457         /* to make it look like a "normal" Unix priority/nice value  */
 458         priority = task_prio(task);
 459         nice = task_nice(task);
 460
 461         /* Temporary variable needed for gcc-2.96 */
 462         /* convert timespec -> nsec*/
 463         start_time =
 464                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 465                                 + task->real_start_time.tv_nsec;
 466         /* convert nsec -> ticks */
 467         start_time = nsec_to_clock_t(start_time);
 468
 469         seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 470 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 471 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
 472                 pid_nr_ns(pid, ns),
 473                 tcomm,
 474                 state,
 475                 ppid,
 476                 pgid,
 477                 sid,
 478                 tty_nr,
 479                 tty_pgrp,
 480                 task->flags,
 481                 min_flt,
 482                 cmin_flt,
 483                 maj_flt,
 484                 cmaj_flt,
 485                 cputime_to_clock_t(utime),
 486                 cputime_to_clock_t(stime),
 487                 cputime_to_clock_t(cutime),
 488                 cputime_to_clock_t(cstime),
 489                 priority,
 490                 nice,
 491                 num_threads,
 492                 start_time,
 493                 vsize,
 494                 mm ? get_mm_rss(mm) : 0,
 495                 rsslim,
 496                 mm ? mm->start_code : 0,
 497                 mm ? mm->end_code : 0,
 498                 (permitted && mm) ? task->stack_start : 0,
 499                 esp,
 500                 eip,
 501                 /* The signal information here is obsolete.
 502                  * It must be decimal for Linux 2.0 compatibility.
 503                  * Use /proc/#/status for real-time signals.
 504                  */
 505                 task->pending.signal.sig[0] & 0x7fffffffUL,
 506                 task->blocked.sig[0] & 0x7fffffffUL,
 507                 sigign      .sig[0] & 0x7fffffffUL,
 508                 sigcatch    .sig[0] & 0x7fffffffUL,
 509                 wchan,
 510                 0UL,
 511                 0UL,
 512                 task->exit_signal,
 513                 task_cpu(task),
 514                 task->rt_priority,
 515                 task->policy,
 516                 (unsigned long long)delayacct_blkio_ticks(task),
 517                 cputime_to_clock_t(gtime),
 518                 cputime_to_clock_t(cgtime));
 519         if (mm)
 520                 mmput(mm);
 521         return 0;
 522 }
 523
 524 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
 525                         struct pid *pid, struct task_struct *task)
 526 {
 527         return do_task_stat(m, ns, pid, task, 0);
 528 }
 529
 530 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
 531                         struct pid *pid, struct task_struct *task)
 532 {
 533         return do_task_stat(m, ns, pid, task, 1);
 534 }
 535
 536 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 537                         struct pid *pid, struct task_struct *task)
 538 {
 539         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 540         struct mm_struct *mm = get_task_mm(task);
 541
 542         if (mm) {
 543                 size = task_statm(mm, &shared, &text, &data, &resident);
 544                 mmput(mm);
 545         }
 546         seq_printf(m, "%d %d %d %d %d %d %d\n",
 547                         size, resident, shared, text, lib, data, 0);
 548
 549         return 0;
 550 }