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/slab.h>
  72 #include <linux/smp.h>
  73 #include <linux/signal.h>
  74 #include <linux/highmem.h>
  75 #include <linux/file.h>
  76 #include <linux/fdtable.h>
  77 #include <linux/times.h>
  78 #include <linux/cpuset.h>
  79 #include <linux/rcupdate.h>
  80 #include <linux/delayacct.h>
  81 #include <linux/seq_file.h>
  82 #include <linux/pid_namespace.h>
  83 #include <linux/tracehook.h>
  84
  85 #include <asm/pgtable.h>
  86 #include <asm/processor.h>
  87 #include "internal.h"
  88
  89 static inline void task_name(struct seq_file *m, struct task_struct *p)
  90 {
  91         int i;
  92         char *buf, *end;
  93         char *name;
  94         char tcomm[sizeof(p->comm)];
  95
  96         get_task_comm(tcomm, p);
  97
  98         seq_printf(m, "Name:\t");
  99         end = m->buf + m->size;
 100         buf = m->buf + m->count;
 101         name = tcomm;
 102         i = sizeof(tcomm);
 103         while (i && (buf < end)) {
 104                 unsigned char c = *name;
 105                 name++;
 106                 i--;
 107                 *buf = c;
 108                 if (!c)
 109                         break;
 110                 if (c == '\\') {
 111                         buf++;
 112                         if (buf < end)
 113                                 *buf++ = c;
 114                         continue;
 115                 }
 116                 if (c == '\n') {
 117                         *buf++ = '\\';
 118                         if (buf < end)
 119                                 *buf++ = 'n';
 120                         continue;
 121                 }
 122                 buf++;
 123         }
 124         m->count = buf - m->buf;
 125         seq_printf(m, "\n");
 126 }
 127
 128 /*
 129  * The task state array is a strange "bitmap" of
 130  * reasons to sleep. Thus "running" is zero, and
 131  * you can test for combinations of others with
 132  * simple bit tests.
 133  */
 134 static const char *task_state_array[] = {
 135         "R (running)",          /*  0 */
 136         "S (sleeping)",         /*  1 */
 137         "D (disk sleep)",       /*  2 */
 138         "T (stopped)",          /*  4 */
 139         "T (tracing stop)",     /*  8 */
 140         "Z (zombie)",           /* 16 */
 141         "X (dead)"              /* 32 */
 142 };
 143
 144 static inline const char *get_task_state(struct task_struct *tsk)
 145 {
 146         unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
 147         const char **p = &task_state_array[0];
 148
 149         while (state) {
 150                 p++;
 151                 state >>= 1;
 152         }
 153         return *p;
 154 }
 155
 156 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 157                                 struct pid *pid, struct task_struct *p)
 158 {
 159         struct group_info *group_info;
 160         int g;
 161         struct fdtable *fdt = NULL;
 162         const struct cred *cred;
 163         pid_t ppid, tpid;
 164
 165         rcu_read_lock();
 166         ppid = pid_alive(p) ?
 167                 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
 168         tpid = 0;
 169         if (pid_alive(p)) {
 170                 struct task_struct *tracer = tracehook_tracer_task(p);
 171                 if (tracer)
 172                         tpid = task_pid_nr_ns(tracer, ns);
 173         }
 174         cred = get_cred((struct cred *) __task_cred(p));
 175         seq_printf(m,
 176                 "State:\t%s\n"
 177                 "Tgid:\t%d\n"
 178                 "Pid:\t%d\n"
 179                 "PPid:\t%d\n"
 180                 "TracerPid:\t%d\n"
 181                 "Uid:\t%d\t%d\t%d\t%d\n"
 182                 "Gid:\t%d\t%d\t%d\t%d\n",
 183                 get_task_state(p),
 184                 task_tgid_nr_ns(p, ns),
 185                 pid_nr_ns(pid, ns),
 186                 ppid, tpid,
 187                 cred->uid, cred->euid, cred->suid, cred->fsuid,
 188                 cred->gid, cred->egid, cred->sgid, cred->fsgid);
 189
 190         task_lock(p);
 191         if (p->files)
 192                 fdt = files_fdtable(p->files);
 193         seq_printf(m,
 194                 "FDSize:\t%d\n"
 195                 "Groups:\t",
 196                 fdt ? fdt->max_fds : 0);
 197         rcu_read_unlock();
 198
 199         group_info = cred->group_info;
 200         task_unlock(p);
 201
 202         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
 203                 seq_printf(m, "%d ", GROUP_AT(group_info, g));
 204         put_cred(cred);
 205
 206         seq_printf(m, "\n");
 207 }
 208
 209 static void render_sigset_t(struct seq_file *m, const char *header,
 210                                 sigset_t *set)
 211 {
 212         int i;
 213
 214         seq_printf(m, "%s", header);
 215
 216         i = _NSIG;
 217         do {
 218                 int x = 0;
 219
 220                 i -= 4;
 221                 if (sigismember(set, i+1)) x |= 1;
 222                 if (sigismember(set, i+2)) x |= 2;
 223                 if (sigismember(set, i+3)) x |= 4;
 224                 if (sigismember(set, i+4)) x |= 8;
 225                 seq_printf(m, "%x", x);
 226         } while (i >= 4);
 227
 228         seq_printf(m, "\n");
 229 }
 230
 231 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 232                                     sigset_t *catch)
 233 {
 234         struct k_sigaction *k;
 235         int i;
 236
 237         k = p->sighand->action;
 238         for (i = 1; i <= _NSIG; ++i, ++k) {
 239                 if (k->sa.sa_handler == SIG_IGN)
 240                         sigaddset(ign, i);
 241                 else if (k->sa.sa_handler != SIG_DFL)
 242                         sigaddset(catch, i);
 243         }
 244 }
 245
 246 static inline void task_sig(struct seq_file *m, struct task_struct *p)
 247 {
 248         unsigned long flags;
 249         sigset_t pending, shpending, blocked, ignored, caught;
 250         int num_threads = 0;
 251         unsigned long qsize = 0;
 252         unsigned long qlim = 0;
 253
 254         sigemptyset(&pending);
 255         sigemptyset(&shpending);
 256         sigemptyset(&blocked);
 257         sigemptyset(&ignored);
 258         sigemptyset(&caught);
 259
 260         if (lock_task_sighand(p, &flags)) {
 261                 pending = p->pending.signal;
 262                 shpending = p->signal->shared_pending.signal;
 263                 blocked = p->blocked;
 264                 collect_sigign_sigcatch(p, &ignored, &caught);
 265                 num_threads = atomic_read(&p->signal->count);
 266                 qsize = atomic_read(&__task_cred(p)->user->sigpending);
 267                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 268                 unlock_task_sighand(p, &flags);
 269         }
 270
 271         seq_printf(m, "Threads:\t%d\n", num_threads);
 272         seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
 273
 274         /* render them all */
 275         render_sigset_t(m, "SigPnd:\t", &pending);
 276         render_sigset_t(m, "ShdPnd:\t", &shpending);
 277         render_sigset_t(m, "SigBlk:\t", &blocked);
 278         render_sigset_t(m, "SigIgn:\t", &ignored);
 279         render_sigset_t(m, "SigCgt:\t", &caught);
 280 }
 281
 282 static void render_cap_t(struct seq_file *m, const char *header,
 283                         kernel_cap_t *a)
 284 {
 285         unsigned __capi;
 286
 287         seq_printf(m, "%s", header);
 288         CAP_FOR_EACH_U32(__capi) {
 289                 seq_printf(m, "%08x",
 290                            a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
 291         }
 292         seq_printf(m, "\n");
 293 }
 294
 295 static inline void task_cap(struct seq_file *m, struct task_struct *p)
 296 {
 297         const struct cred *cred;
 298         kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
 299
 300         rcu_read_lock();
 301         cred = __task_cred(p);
 302         cap_inheritable = cred->cap_inheritable;
 303         cap_permitted   = cred->cap_permitted;
 304         cap_effective   = cred->cap_effective;
 305         cap_bset        = cred->cap_bset;
 306         rcu_read_unlock();
 307
 308         render_cap_t(m, "CapInh:\t", &cap_inheritable);
 309         render_cap_t(m, "CapPrm:\t", &cap_permitted);
 310         render_cap_t(m, "CapEff:\t", &cap_effective);
 311         render_cap_t(m, "CapBnd:\t", &cap_bset);
 312 }
 313
 314 static inline void task_context_switch_counts(struct seq_file *m,
 315                                                 struct task_struct *p)
 316 {
 317         seq_printf(m,   "voluntary_ctxt_switches:\t%lu\n"
 318                         "nonvoluntary_ctxt_switches:\t%lu\n",
 319                         p->nvcsw,
 320                         p->nivcsw);
 321 }
 322
 323 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 324                         struct pid *pid, struct task_struct *task)
 325 {
 326         struct mm_struct *mm = get_task_mm(task);
 327
 328         task_name(m, task);
 329         task_state(m, ns, pid, task);
 330
 331         if (mm) {
 332                 task_mem(m, mm);
 333                 mmput(mm);
 334         }
 335         task_sig(m, task);
 336         task_cap(m, task);
 337         cpuset_task_status_allowed(m, task);
 338 #if defined(CONFIG_S390)
 339         task_show_regs(m, task);
 340 #endif
 341         task_context_switch_counts(m, task);
 342         return 0;
 343 }
 344
 345 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 346                         struct pid *pid, struct task_struct *task, int whole)
 347 {
 348         unsigned long vsize, eip, esp, wchan = ~0UL;
 349         long priority, nice;
 350         int tty_pgrp = -1, tty_nr = 0;
 351         sigset_t sigign, sigcatch;
 352         char state;
 353         pid_t ppid = 0, pgid = -1, sid = -1;
 354         int num_threads = 0;
 355         struct mm_struct *mm;
 356         unsigned long long start_time;
 357         unsigned long cmin_flt = 0, cmaj_flt = 0;
 358         unsigned long  min_flt = 0,  maj_flt = 0;
 359         cputime_t cutime, cstime, utime, stime;
 360         cputime_t cgtime, gtime;
 361         unsigned long rsslim = 0;
 362         char tcomm[sizeof(task->comm)];
 363         unsigned long flags;
 364
 365         state = *get_task_state(task);
 366         vsize = eip = esp = 0;
 367         mm = get_task_mm(task);
 368         if (mm) {
 369                 vsize = task_vsize(mm);
 370                 eip = KSTK_EIP(task);
 371                 esp = KSTK_ESP(task);
 372         }
 373
 374         get_task_comm(tcomm, task);
 375
 376         sigemptyset(&sigign);
 377         sigemptyset(&sigcatch);
 378         cutime = cstime = utime = stime = cputime_zero;
 379         cgtime = gtime = cputime_zero;
 380
 381         if (lock_task_sighand(task, &flags)) {
 382                 struct signal_struct *sig = task->signal;
 383
 384                 if (sig->tty) {
 385                         struct pid *pgrp = tty_get_pgrp(sig->tty);
 386                         tty_pgrp = pid_nr_ns(pgrp, ns);
 387                         put_pid(pgrp);
 388                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 389                 }
 390
 391                 num_threads = atomic_read(&sig->count);
 392                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 393
 394                 cmin_flt = sig->cmin_flt;
 395                 cmaj_flt = sig->cmaj_flt;
 396                 cutime = sig->cutime;
 397                 cstime = sig->cstime;
 398                 cgtime = sig->cgtime;
 399                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
 400
 401                 /* add up live thread stats at the group level */
 402                 if (whole) {
 403                         struct task_cputime cputime;
 404                         struct task_struct *t = task;
 405                         do {
 406                                 min_flt += t->min_flt;
 407                                 maj_flt += t->maj_flt;
 408                                 gtime = cputime_add(gtime, task_gtime(t));
 409                                 t = next_thread(t);
 410                         } while (t != task);
 411
 412                         min_flt += sig->min_flt;
 413                         maj_flt += sig->maj_flt;
 414                         thread_group_cputime(task, &cputime);
 415                         utime = cputime.utime;
 416                         stime = cputime.stime;
 417                         gtime = cputime_add(gtime, sig->gtime);
 418                 }
 419
 420                 sid = task_session_nr_ns(task, ns);
 421                 ppid = task_tgid_nr_ns(task->real_parent, ns);
 422                 pgid = task_pgrp_nr_ns(task, ns);
 423
 424                 unlock_task_sighand(task, &flags);
 425         }
 426
 427         if (!whole || num_threads < 2)
 428                 wchan = get_wchan(task);
 429         if (!whole) {
 430                 min_flt = task->min_flt;
 431                 maj_flt = task->maj_flt;
 432                 utime = task_utime(task);
 433                 stime = task_stime(task);
 434                 gtime = task_gtime(task);
 435         }
 436
 437         /* scale priority and nice values from timeslices to -20..20 */
 438         /* to make it look like a "normal" Unix priority/nice value  */
 439         priority = task_prio(task);
 440         nice = task_nice(task);
 441
 442         /* Temporary variable needed for gcc-2.96 */
 443         /* convert timespec -> nsec*/
 444         start_time =
 445                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 446                                 + task->real_start_time.tv_nsec;
 447         /* convert nsec -> ticks */
 448         start_time = nsec_to_clock_t(start_time);
 449
 450         seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 451 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 452 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
 453                 pid_nr_ns(pid, ns),
 454                 tcomm,
 455                 state,
 456                 ppid,
 457                 pgid,
 458                 sid,
 459                 tty_nr,
 460                 tty_pgrp,
 461                 task->flags,
 462                 min_flt,
 463                 cmin_flt,
 464                 maj_flt,
 465                 cmaj_flt,
 466                 cputime_to_clock_t(utime),
 467                 cputime_to_clock_t(stime),
 468                 cputime_to_clock_t(cutime),
 469                 cputime_to_clock_t(cstime),
 470                 priority,
 471                 nice,
 472                 num_threads,
 473                 start_time,
 474                 vsize,
 475                 mm ? get_mm_rss(mm) : 0,
 476                 rsslim,
 477                 mm ? mm->start_code : 0,
 478                 mm ? mm->end_code : 0,
 479                 mm ? mm->start_stack : 0,
 480                 esp,
 481                 eip,
 482                 /* The signal information here is obsolete.
 483                  * It must be decimal for Linux 2.0 compatibility.
 484                  * Use /proc/#/status for real-time signals.
 485                  */
 486                 task->pending.signal.sig[0] & 0x7fffffffUL,
 487                 task->blocked.sig[0] & 0x7fffffffUL,
 488                 sigign      .sig[0] & 0x7fffffffUL,
 489                 sigcatch    .sig[0] & 0x7fffffffUL,
 490                 wchan,
 491                 0UL,
 492                 0UL,
 493                 task->exit_signal,
 494                 task_cpu(task),
 495                 task->rt_priority,
 496                 task->policy,
 497                 (unsigned long long)delayacct_blkio_ticks(task),
 498                 cputime_to_clock_t(gtime),
 499                 cputime_to_clock_t(cgtime));
 500         if (mm)
 501                 mmput(mm);
 502         return 0;
 503 }
 504
 505 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
 506                         struct pid *pid, struct task_struct *task)
 507 {
 508         return do_task_stat(m, ns, pid, task, 0);
 509 }
 510
 511 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
 512                         struct pid *pid, struct task_struct *task)
 513 {
 514         return do_task_stat(m, ns, pid, task, 1);
 515 }
 516
 517 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 518                         struct pid *pid, struct task_struct *task)
 519 {
 520         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 521         struct mm_struct *mm = get_task_mm(task);
 522
 523         if (mm) {
 524                 size = task_statm(mm, &shared, &text, &data, &resident);
 525                 mmput(mm);
 526         }
 527         seq_printf(m, "%d %d %d %d %d %d %d\n",
 528                         size, resident, shared, text, lib, data, 0);
 529
 530         return 0;
 531 }