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/ptrace.h>
  84 #include <linux/tracehook.h>
  85 #include <linux/swapops.h>
  86
  87 #include <asm/pgtable.h>
  88 #include <asm/processor.h>
  89 #include "internal.h"
  90
  91 static inline void task_name(struct seq_file *m, struct task_struct *p)
  92 {
  93         int i;
  94         char *buf, *end;
  95         char *name;
  96         char tcomm[sizeof(p->comm)];
  97
  98         get_task_comm(tcomm, p);
  99
 100         seq_printf(m, "Name:\t");
 101         end = m->buf + m->size;
 102         buf = m->buf + m->count;
 103         name = tcomm;
 104         i = sizeof(tcomm);
 105         while (i && (buf < end)) {
 106                 unsigned char c = *name;
 107                 name++;
 108                 i--;
 109                 *buf = c;
 110                 if (!c)
 111                         break;
 112                 if (c == '\\') {
 113                         buf++;
 114                         if (buf < end)
 115                                 *buf++ = c;
 116                         continue;
 117                 }
 118                 if (c == '\n') {
 119                         *buf++ = '\\';
 120                         if (buf < end)
 121                                 *buf++ = 'n';
 122                         continue;
 123                 }
 124                 buf++;
 125         }
 126         m->count = buf - m->buf;
 127         seq_printf(m, "\n");
 128 }
 129
 130 /*
 131  * The task state array is a strange "bitmap" of
 132  * reasons to sleep. Thus "running" is zero, and
 133  * you can test for combinations of others with
 134  * simple bit tests.
 135  */
 136 static const char *task_state_array[] = {
 137         "R (running)",          /*  0 */
 138         "S (sleeping)",         /*  1 */
 139         "D (disk sleep)",       /*  2 */
 140         "T (stopped)",          /*  4 */
 141         "t (tracing stop)",     /*  8 */
 142         "Z (zombie)",           /* 16 */
 143         "X (dead)",             /* 32 */
 144         "x (dead)",             /* 64 */
 145         "K (wakekill)",         /* 128 */
 146         "W (waking)",           /* 256 */
 147 };
 148
 149 static inline const char *get_task_state(struct task_struct *tsk)
 150 {
 151         unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
 152         const char **p = &task_state_array[0];
 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 = tracehook_tracer_task(p);
 176                 if (tracer)
 177                         tpid = task_pid_nr_ns(tracer, ns);
 178         }
 179         cred = get_cred((struct cred *) __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_printf(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_printf(m, "%s", 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_printf(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 = atomic_read(&p->signal->count);
 271                 qsize = atomic_read(&__task_cred(p)->user->sigpending);
 272                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 273                 unlock_task_sighand(p, &flags);
 274         }
 275
 276         seq_printf(m, "Threads:\t%d\n", num_threads);
 277         seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
 278
 279         /* render them all */
 280         render_sigset_t(m, "SigPnd:\t", &pending);
 281         render_sigset_t(m, "ShdPnd:\t", &shpending);
 282         render_sigset_t(m, "SigBlk:\t", &blocked);
 283         render_sigset_t(m, "SigIgn:\t", &ignored);
 284         render_sigset_t(m, "SigCgt:\t", &caught);
 285 }
 286
 287 static void render_cap_t(struct seq_file *m, const char *header,
 288                         kernel_cap_t *a)
 289 {
 290         unsigned __capi;
 291
 292         seq_printf(m, "%s", header);
 293         CAP_FOR_EACH_U32(__capi) {
 294                 seq_printf(m, "%08x",
 295                            a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
 296         }
 297         seq_printf(m, "\n");
 298 }
 299
 300 static inline void task_cap(struct seq_file *m, struct task_struct *p)
 301 {
 302         const struct cred *cred;
 303         kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
 304
 305         rcu_read_lock();
 306         cred = __task_cred(p);
 307         cap_inheritable = cred->cap_inheritable;
 308         cap_permitted   = cred->cap_permitted;
 309         cap_effective   = cred->cap_effective;
 310         cap_bset        = cred->cap_bset;
 311         rcu_read_unlock();
 312
 313         render_cap_t(m, "CapInh:\t", &cap_inheritable);
 314         render_cap_t(m, "CapPrm:\t", &cap_permitted);
 315         render_cap_t(m, "CapEff:\t", &cap_effective);
 316         render_cap_t(m, "CapBnd:\t", &cap_bset);
 317 }
 318
 319 static inline void task_context_switch_counts(struct seq_file *m,
 320                                                 struct task_struct *p)
 321 {
 322         seq_printf(m,   "voluntary_ctxt_switches:\t%lu\n"
 323                         "nonvoluntary_ctxt_switches:\t%lu\n",
 324                         p->nvcsw,
 325                         p->nivcsw);
 326 }
 327
 328 #ifdef CONFIG_MMU
 329
 330 struct stack_stats {
 331         struct vm_area_struct *vma;
 332         unsigned long   startpage;
 333         unsigned long   usage;
 334 };
 335
 336 static int stack_usage_pte_range(pmd_t *pmd, unsigned long addr,
 337                                 unsigned long end, struct mm_walk *walk)
 338 {
 339         struct stack_stats *ss = walk->private;
 340         struct vm_area_struct *vma = ss->vma;
 341         pte_t *pte, ptent;
 342         spinlock_t *ptl;
 343         int ret = 0;
 344
 345         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 346         for (; addr != end; pte++, addr += PAGE_SIZE) {
 347                 ptent = *pte;
 348
 349 #ifdef CONFIG_STACK_GROWSUP
 350                 if (pte_present(ptent) || is_swap_pte(ptent))
 351                         ss->usage = addr - ss->startpage + PAGE_SIZE;
 352 #else
 353                 if (pte_present(ptent) || is_swap_pte(ptent)) {
 354                         ss->usage = ss->startpage - addr + PAGE_SIZE;
 355                         pte++;
 356                         ret = 1;
 357                         break;
 358                 }
 359 #endif
 360         }
 361         pte_unmap_unlock(pte - 1, ptl);
 362         cond_resched();
 363         return ret;
 364 }
 365
 366 static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct *vma,
 367                                 struct task_struct *task)
 368 {
 369         struct stack_stats ss;
 370         struct mm_walk stack_walk = {
 371                 .pmd_entry = stack_usage_pte_range,
 372                 .mm = vma->vm_mm,
 373                 .private = &ss,
 374         };
 375
 376         if (!vma->vm_mm || is_vm_hugetlb_page(vma))
 377                 return 0;
 378
 379         ss.vma = vma;
 380         ss.startpage = task->stack_start & PAGE_MASK;
 381         ss.usage = 0;
 382
 383 #ifdef CONFIG_STACK_GROWSUP
 384         walk_page_range(KSTK_ESP(task) & PAGE_MASK, vma->vm_end,
 385                 &stack_walk);
 386 #else
 387         walk_page_range(vma->vm_start, (KSTK_ESP(task) & PAGE_MASK) + PAGE_SIZE,
 388                 &stack_walk);
 389 #endif
 390         return ss.usage;
 391 }
 392
 393 static inline void task_show_stack_usage(struct seq_file *m,
 394                                                 struct task_struct *task)
 395 {
 396         struct vm_area_struct   *vma;
 397         struct mm_struct        *mm = get_task_mm(task);
 398
 399         if (mm) {
 400                 down_read(&mm->mmap_sem);
 401                 vma = find_vma(mm, task->stack_start);
 402                 if (vma)
 403                         seq_printf(m, "Stack usage:\t%lu kB\n",
 404                                 get_stack_usage_in_bytes(vma, task) >> 10);
 405
 406                 up_read(&mm->mmap_sem);
 407                 mmput(mm);
 408         }
 409 }
 410 #else
 411 static void task_show_stack_usage(struct seq_file *m, struct task_struct *task)
 412 {
 413 }
 414 #endif          /* CONFIG_MMU */
 415
 416 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
 417 {
 418         seq_printf(m, "Cpus_allowed:\t");
 419         seq_cpumask(m, &task->cpus_allowed);
 420         seq_printf(m, "\n");
 421         seq_printf(m, "Cpus_allowed_list:\t");
 422         seq_cpumask_list(m, &task->cpus_allowed);
 423         seq_printf(m, "\n");
 424 }
 425
 426 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 427                         struct pid *pid, struct task_struct *task)
 428 {
 429         struct mm_struct *mm = get_task_mm(task);
 430
 431         task_name(m, task);
 432         task_state(m, ns, pid, task);
 433
 434         if (mm) {
 435                 task_mem(m, mm);
 436                 mmput(mm);
 437         }
 438         task_sig(m, task);
 439         task_cap(m, task);
 440         task_cpus_allowed(m, task);
 441         cpuset_task_status_allowed(m, task);
 442 #if defined(CONFIG_S390)
 443         task_show_regs(m, task);
 444 #endif
 445         task_context_switch_counts(m, task);
 446         task_show_stack_usage(m, task);
 447         return 0;
 448 }
 449
 450 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 451                         struct pid *pid, struct task_struct *task, int whole)
 452 {
 453         unsigned long vsize, eip, esp, wchan = ~0UL;
 454         long priority, nice;
 455         int tty_pgrp = -1, tty_nr = 0;
 456         sigset_t sigign, sigcatch;
 457         char state;
 458         pid_t ppid = 0, pgid = -1, sid = -1;
 459         int num_threads = 0;
 460         int permitted;
 461         struct mm_struct *mm;
 462         unsigned long long start_time;
 463         unsigned long cmin_flt = 0, cmaj_flt = 0;
 464         unsigned long  min_flt = 0,  maj_flt = 0;
 465         cputime_t cutime, cstime, utime, stime;
 466         cputime_t cgtime, gtime;
 467         unsigned long rsslim = 0;
 468         char tcomm[sizeof(task->comm)];
 469         unsigned long flags;
 470
 471         state = *get_task_state(task);
 472         vsize = eip = esp = 0;
 473         permitted = ptrace_may_access(task, PTRACE_MODE_READ);
 474         mm = get_task_mm(task);
 475         if (mm) {
 476                 vsize = task_vsize(mm);
 477                 if (permitted) {
 478                         eip = KSTK_EIP(task);
 479                         esp = KSTK_ESP(task);
 480                 }
 481         }
 482
 483         get_task_comm(tcomm, task);
 484
 485         sigemptyset(&sigign);
 486         sigemptyset(&sigcatch);
 487         cutime = cstime = utime = stime = cputime_zero;
 488         cgtime = gtime = cputime_zero;
 489
 490         if (lock_task_sighand(task, &flags)) {
 491                 struct signal_struct *sig = task->signal;
 492
 493                 if (sig->tty) {
 494                         struct pid *pgrp = tty_get_pgrp(sig->tty);
 495                         tty_pgrp = pid_nr_ns(pgrp, ns);
 496                         put_pid(pgrp);
 497                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 498                 }
 499
 500                 num_threads = atomic_read(&sig->count);
 501                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 502
 503                 cmin_flt = sig->cmin_flt;
 504                 cmaj_flt = sig->cmaj_flt;
 505                 cutime = sig->cutime;
 506                 cstime = sig->cstime;
 507                 cgtime = sig->cgtime;
 508                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
 509
 510                 /* add up live thread stats at the group level */
 511                 if (whole) {
 512                         struct task_struct *t = task;
 513                         do {
 514                                 min_flt += t->min_flt;
 515                                 maj_flt += t->maj_flt;
 516                                 gtime = cputime_add(gtime, t->gtime);
 517                                 t = next_thread(t);
 518                         } while (t != task);
 519
 520                         min_flt += sig->min_flt;
 521                         maj_flt += sig->maj_flt;
 522                         thread_group_times(task, &utime, &stime);
 523                         gtime = cputime_add(gtime, sig->gtime);
 524                 }
 525
 526                 sid = task_session_nr_ns(task, ns);
 527                 ppid = task_tgid_nr_ns(task->real_parent, ns);
 528                 pgid = task_pgrp_nr_ns(task, ns);
 529
 530                 unlock_task_sighand(task, &flags);
 531         }
 532
 533         if (permitted && (!whole || num_threads < 2))
 534                 wchan = get_wchan(task);
 535         if (!whole) {
 536                 min_flt = task->min_flt;
 537                 maj_flt = task->maj_flt;
 538                 task_times(task, &utime, &stime);
 539                 gtime = task->gtime;
 540         }
 541
 542         /* scale priority and nice values from timeslices to -20..20 */
 543         /* to make it look like a "normal" Unix priority/nice value  */
 544         priority = task_prio(task);
 545         nice = task_nice(task);
 546
 547         /* Temporary variable needed for gcc-2.96 */
 548         /* convert timespec -> nsec*/
 549         start_time =
 550                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 551                                 + task->real_start_time.tv_nsec;
 552         /* convert nsec -> ticks */
 553         start_time = nsec_to_clock_t(start_time);
 554
 555         seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 556 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 557 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
 558                 pid_nr_ns(pid, ns),
 559                 tcomm,
 560                 state,
 561                 ppid,
 562                 pgid,
 563                 sid,
 564                 tty_nr,
 565                 tty_pgrp,
 566                 task->flags,
 567                 min_flt,
 568                 cmin_flt,
 569                 maj_flt,
 570                 cmaj_flt,
 571                 cputime_to_clock_t(utime),
 572                 cputime_to_clock_t(stime),
 573                 cputime_to_clock_t(cutime),
 574                 cputime_to_clock_t(cstime),
 575                 priority,
 576                 nice,
 577                 num_threads,
 578                 start_time,
 579                 vsize,
 580                 mm ? get_mm_rss(mm) : 0,
 581                 rsslim,
 582                 mm ? mm->start_code : 0,
 583                 mm ? mm->end_code : 0,
 584                 (permitted && mm) ? task->stack_start : 0,
 585                 esp,
 586                 eip,
 587                 /* The signal information here is obsolete.
 588                  * It must be decimal for Linux 2.0 compatibility.
 589                  * Use /proc/#/status for real-time signals.
 590                  */
 591                 task->pending.signal.sig[0] & 0x7fffffffUL,
 592                 task->blocked.sig[0] & 0x7fffffffUL,
 593                 sigign      .sig[0] & 0x7fffffffUL,
 594                 sigcatch    .sig[0] & 0x7fffffffUL,
 595                 wchan,
 596                 0UL,
 597                 0UL,
 598                 task->exit_signal,
 599                 task_cpu(task),
 600                 task->rt_priority,
 601                 task->policy,
 602                 (unsigned long long)delayacct_blkio_ticks(task),
 603                 cputime_to_clock_t(gtime),
 604                 cputime_to_clock_t(cgtime));
 605         if (mm)
 606                 mmput(mm);
 607         return 0;
 608 }
 609
 610 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
 611                         struct pid *pid, struct task_struct *task)
 612 {
 613         return do_task_stat(m, ns, pid, task, 0);
 614 }
 615
 616 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
 617                         struct pid *pid, struct task_struct *task)
 618 {
 619         return do_task_stat(m, ns, pid, task, 1);
 620 }
 621
 622 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 623                         struct pid *pid, struct task_struct *task)
 624 {
 625         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 626         struct mm_struct *mm = get_task_mm(task);
 627
 628         if (mm) {
 629                 size = task_statm(mm, &shared, &text, &data, &resident);
 630                 mmput(mm);
 631         }
 632         seq_printf(m, "%d %d %d %d %d %d %d\n",
 633                         size, resident, shared, text, lib, data, 0);
 634
 635         return 0;
 636 }