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
  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_puts(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_putc(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 * const 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         "x (dead)",             /*  64 */
 143         "K (wakekill)",         /* 128 */
 144         "W (waking)",           /* 256 */
 145 };
 146
 147 static inline const char *get_task_state(struct task_struct *tsk)
 148 {
 149         unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
 150         const char * const *p = &task_state_array[0];
 151
 152         BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX) != ARRAY_SIZE(task_state_array));
 153
 154         while (state) {
 155                 p++;
 156                 state >>= 1;
 157         }
 158         return *p;
 159 }
 160
 161 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 162                                 struct pid *pid, struct task_struct *p)
 163 {
 164         struct group_info *group_info;
 165         int g;
 166         struct fdtable *fdt = NULL;
 167         const struct cred *cred;
 168         pid_t ppid, tpid;
 169
 170         rcu_read_lock();
 171         ppid = pid_alive(p) ?
 172                 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
 173         tpid = 0;
 174         if (pid_alive(p)) {
 175                 struct task_struct *tracer = ptrace_parent(p);
 176                 if (tracer)
 177                         tpid = task_pid_nr_ns(tracer, ns);
 178         }
 179         cred = get_task_cred(p);
 180         seq_printf(m,
 181                 "State:\t%s\n"
 182                 "Tgid:\t%d\n"
 183                 "Pid:\t%d\n"
 184                 "PPid:\t%d\n"
 185                 "TracerPid:\t%d\n"
 186                 "Uid:\t%d\t%d\t%d\t%d\n"
 187                 "Gid:\t%d\t%d\t%d\t%d\n",
 188                 get_task_state(p),
 189                 task_tgid_nr_ns(p, ns),
 190                 pid_nr_ns(pid, ns),
 191                 ppid, tpid,
 192                 cred->uid, cred->euid, cred->suid, cred->fsuid,
 193                 cred->gid, cred->egid, cred->sgid, cred->fsgid);
 194
 195         task_lock(p);
 196         if (p->files)
 197                 fdt = files_fdtable(p->files);
 198         seq_printf(m,
 199                 "FDSize:\t%d\n"
 200                 "Groups:\t",
 201                 fdt ? fdt->max_fds : 0);
 202         rcu_read_unlock();
 203
 204         group_info = cred->group_info;
 205         task_unlock(p);
 206
 207         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
 208                 seq_printf(m, "%d ", GROUP_AT(group_info, g));
 209         put_cred(cred);
 210
 211         seq_putc(m, '\n');
 212 }
 213
 214 static void render_sigset_t(struct seq_file *m, const char *header,
 215                                 sigset_t *set)
 216 {
 217         int i;
 218
 219         seq_puts(m, header);
 220
 221         i = _NSIG;
 222         do {
 223                 int x = 0;
 224
 225                 i -= 4;
 226                 if (sigismember(set, i+1)) x |= 1;
 227                 if (sigismember(set, i+2)) x |= 2;
 228                 if (sigismember(set, i+3)) x |= 4;
 229                 if (sigismember(set, i+4)) x |= 8;
 230                 seq_printf(m, "%x", x);
 231         } while (i >= 4);
 232
 233         seq_putc(m, '\n');
 234 }
 235
 236 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 237                                     sigset_t *catch)
 238 {
 239         struct k_sigaction *k;
 240         int i;
 241
 242         k = p->sighand->action;
 243         for (i = 1; i <= _NSIG; ++i, ++k) {
 244                 if (k->sa.sa_handler == SIG_IGN)
 245                         sigaddset(ign, i);
 246                 else if (k->sa.sa_handler != SIG_DFL)
 247                         sigaddset(catch, i);
 248         }
 249 }
 250
 251 static inline void task_sig(struct seq_file *m, struct task_struct *p)
 252 {
 253         unsigned long flags;
 254         sigset_t pending, shpending, blocked, ignored, caught;
 255         int num_threads = 0;
 256         unsigned long qsize = 0;
 257         unsigned long qlim = 0;
 258
 259         sigemptyset(&pending);
 260         sigemptyset(&shpending);
 261         sigemptyset(&blocked);
 262         sigemptyset(&ignored);
 263         sigemptyset(&caught);
 264
 265         if (lock_task_sighand(p, &flags)) {
 266                 pending = p->pending.signal;
 267                 shpending = p->signal->shared_pending.signal;
 268                 blocked = p->blocked;
 269                 collect_sigign_sigcatch(p, &ignored, &caught);
 270                 num_threads = get_nr_threads(p);
 271                 rcu_read_lock();  /* FIXME: is this correct? */
 272                 qsize = atomic_read(&__task_cred(p)->user->sigpending);
 273                 rcu_read_unlock();
 274                 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
 275                 unlock_task_sighand(p, &flags);
 276         }
 277
 278         seq_printf(m, "Threads:\t%d\n", num_threads);
 279         seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
 280
 281         /* render them all */
 282         render_sigset_t(m, "SigPnd:\t", &pending);
 283         render_sigset_t(m, "ShdPnd:\t", &shpending);
 284         render_sigset_t(m, "SigBlk:\t", &blocked);
 285         render_sigset_t(m, "SigIgn:\t", &ignored);
 286         render_sigset_t(m, "SigCgt:\t", &caught);
 287 }
 288
 289 static void render_cap_t(struct seq_file *m, const char *header,
 290                         kernel_cap_t *a)
 291 {
 292         unsigned __capi;
 293
 294         seq_puts(m, header);
 295         CAP_FOR_EACH_U32(__capi) {
 296                 seq_printf(m, "%08x",
 297                            a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
 298         }
 299         seq_putc(m, '\n');
 300 }
 301
 302 static inline void task_cap(struct seq_file *m, struct task_struct *p)
 303 {
 304         const struct cred *cred;
 305         kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
 306
 307         rcu_read_lock();
 308         cred = __task_cred(p);
 309         cap_inheritable = cred->cap_inheritable;
 310         cap_permitted   = cred->cap_permitted;
 311         cap_effective   = cred->cap_effective;
 312         cap_bset        = cred->cap_bset;
 313         rcu_read_unlock();
 314
 315         render_cap_t(m, "CapInh:\t", &cap_inheritable);
 316         render_cap_t(m, "CapPrm:\t", &cap_permitted);
 317         render_cap_t(m, "CapEff:\t", &cap_effective);
 318         render_cap_t(m, "CapBnd:\t", &cap_bset);
 319 }
 320
 321 static inline void task_context_switch_counts(struct seq_file *m,
 322                                                 struct task_struct *p)
 323 {
 324         seq_printf(m,   "voluntary_ctxt_switches:\t%lu\n"
 325                         "nonvoluntary_ctxt_switches:\t%lu\n",
 326                         p->nvcsw,
 327                         p->nivcsw);
 328 }
 329
 330 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
 331 {
 332         seq_puts(m, "Cpus_allowed:\t");
 333         seq_cpumask(m, &task->cpus_allowed);
 334         seq_putc(m, '\n');
 335         seq_puts(m, "Cpus_allowed_list:\t");
 336         seq_cpumask_list(m, &task->cpus_allowed);
 337         seq_putc(m, '\n');
 338 }
 339
 340 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 341                         struct pid *pid, struct task_struct *task)
 342 {
 343         struct mm_struct *mm = get_task_mm(task);
 344
 345         task_name(m, task);
 346         task_state(m, ns, pid, task);
 347
 348         if (mm) {
 349                 task_mem(m, mm);
 350                 mmput(mm);
 351         }
 352         task_sig(m, task);
 353         task_cap(m, task);
 354         task_cpus_allowed(m, task);
 355         cpuset_task_status_allowed(m, task);
 356         task_context_switch_counts(m, task);
 357         return 0;
 358 }
 359
 360 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 361                         struct pid *pid, struct task_struct *task, int whole)
 362 {
 363         unsigned long vsize, eip, esp, wchan = ~0UL;
 364         long priority, nice;
 365         int tty_pgrp = -1, tty_nr = 0;
 366         sigset_t sigign, sigcatch;
 367         char state;
 368         pid_t ppid = 0, pgid = -1, sid = -1;
 369         int num_threads = 0;
 370         int permitted;
 371         struct mm_struct *mm;
 372         unsigned long long start_time;
 373         unsigned long cmin_flt = 0, cmaj_flt = 0;
 374         unsigned long  min_flt = 0,  maj_flt = 0;
 375         cputime_t cutime, cstime, utime, stime;
 376         cputime_t cgtime, gtime;
 377         unsigned long rsslim = 0;
 378         char tcomm[sizeof(task->comm)];
 379         unsigned long flags;
 380
 381         state = *get_task_state(task);
 382         vsize = eip = esp = 0;
 383         permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
 384         mm = get_task_mm(task);
 385         if (mm) {
 386                 vsize = task_vsize(mm);
 387                 if (permitted) {
 388                         eip = KSTK_EIP(task);
 389                         esp = KSTK_ESP(task);
 390                 }
 391         }
 392
 393         get_task_comm(tcomm, task);
 394
 395         sigemptyset(&sigign);
 396         sigemptyset(&sigcatch);
 397         cutime = cstime = utime = stime = 0;
 398         cgtime = gtime = 0;
 399
 400         if (lock_task_sighand(task, &flags)) {
 401                 struct signal_struct *sig = task->signal;
 402
 403                 if (sig->tty) {
 404                         struct pid *pgrp = tty_get_pgrp(sig->tty);
 405                         tty_pgrp = pid_nr_ns(pgrp, ns);
 406                         put_pid(pgrp);
 407                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 408                 }
 409
 410                 num_threads = get_nr_threads(task);
 411                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 412
 413                 cmin_flt = sig->cmin_flt;
 414                 cmaj_flt = sig->cmaj_flt;
 415                 cutime = sig->cutime;
 416                 cstime = sig->cstime;
 417                 cgtime = sig->cgtime;
 418                 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
 419
 420                 /* add up live thread stats at the group level */
 421                 if (whole) {
 422                         struct task_struct *t = task;
 423                         do {
 424                                 min_flt += t->min_flt;
 425                                 maj_flt += t->maj_flt;
 426                                 gtime += t->gtime;
 427                                 t = next_thread(t);
 428                         } while (t != task);
 429
 430                         min_flt += sig->min_flt;
 431                         maj_flt += sig->maj_flt;
 432                         thread_group_times(task, &utime, &stime);
 433                         gtime += sig->gtime;
 434                 }
 435
 436                 sid = task_session_nr_ns(task, ns);
 437                 ppid = task_tgid_nr_ns(task->real_parent, ns);
 438                 pgid = task_pgrp_nr_ns(task, ns);
 439
 440                 unlock_task_sighand(task, &flags);
 441         }
 442
 443         if (permitted && (!whole || num_threads < 2))
 444                 wchan = get_wchan(task);
 445         if (!whole) {
 446                 min_flt = task->min_flt;
 447                 maj_flt = task->maj_flt;
 448                 task_times(task, &utime, &stime);
 449                 gtime = task->gtime;
 450         }
 451
 452         /* scale priority and nice values from timeslices to -20..20 */
 453         /* to make it look like a "normal" Unix priority/nice value  */
 454         priority = task_prio(task);
 455         nice = task_nice(task);
 456
 457         /* Temporary variable needed for gcc-2.96 */
 458         /* convert timespec -> nsec*/
 459         start_time =
 460                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 461                                 + task->real_start_time.tv_nsec;
 462         /* convert nsec -> ticks */
 463         start_time = nsec_to_clock_t(start_time);
 464
 465         seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 466 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 467 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu\n",
 468                 pid_nr_ns(pid, ns),
 469                 tcomm,
 470                 state,
 471                 ppid,
 472                 pgid,
 473                 sid,
 474                 tty_nr,
 475                 tty_pgrp,
 476                 task->flags,
 477                 min_flt,
 478                 cmin_flt,
 479                 maj_flt,
 480                 cmaj_flt,
 481                 cputime_to_clock_t(utime),
 482                 cputime_to_clock_t(stime),
 483                 cputime_to_clock_t(cutime),
 484                 cputime_to_clock_t(cstime),
 485                 priority,
 486                 nice,
 487                 num_threads,
 488                 start_time,
 489                 vsize,
 490                 mm ? get_mm_rss(mm) : 0,
 491                 rsslim,
 492                 mm ? (permitted ? mm->start_code : 1) : 0,
 493                 mm ? (permitted ? mm->end_code : 1) : 0,
 494                 (permitted && mm) ? mm->start_stack : 0,
 495                 esp,
 496                 eip,
 497                 /* The signal information here is obsolete.
 498                  * It must be decimal for Linux 2.0 compatibility.
 499                  * Use /proc/#/status for real-time signals.
 500                  */
 501                 task->pending.signal.sig[0] & 0x7fffffffUL,
 502                 task->blocked.sig[0] & 0x7fffffffUL,
 503                 sigign      .sig[0] & 0x7fffffffUL,
 504                 sigcatch    .sig[0] & 0x7fffffffUL,
 505                 wchan,
 506                 0UL,
 507                 0UL,
 508                 task->exit_signal,
 509                 task_cpu(task),
 510                 task->rt_priority,
 511                 task->policy,
 512                 (unsigned long long)delayacct_blkio_ticks(task),
 513                 cputime_to_clock_t(gtime),
 514                 cputime_to_clock_t(cgtime),
 515                 (mm && permitted) ? mm->start_data : 0,
 516                 (mm && permitted) ? mm->end_data : 0,
 517                 (mm && permitted) ? mm->start_brk : 0);
 518         if (mm)
 519                 mmput(mm);
 520         return 0;
 521 }
 522
 523 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
 524                         struct pid *pid, struct task_struct *task)
 525 {
 526         return do_task_stat(m, ns, pid, task, 0);
 527 }
 528
 529 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
 530                         struct pid *pid, struct task_struct *task)
 531 {
 532         return do_task_stat(m, ns, pid, task, 1);
 533 }
 534
 535 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 536                         struct pid *pid, struct task_struct *task)
 537 {
 538         unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
 539         struct mm_struct *mm = get_task_mm(task);
 540
 541         if (mm) {
 542                 size = task_statm(mm, &shared, &text, &data, &resident);
 543                 mmput(mm);
 544         }
 545         seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
 546                         size, resident, shared, text, data);
 547
 548         return 0;
 549 }