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 };
 145
 146 static inline const char *get_task_state(struct task_struct *tsk)
 147 {
 148         unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
 149         const char **p = &task_state_array[0];
 150
 151         while (state) {
 152                 p++;
 153                 state >>= 1;
 154         }
 155         return *p;
 156 }
 157
 158 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 159                                 struct pid *pid, struct task_struct *p)
 160 {
 161         struct group_info *group_info;
 162         int g;
 163         struct fdtable *fdt = NULL;
 164         const struct cred *cred;
 165         pid_t ppid, tpid;
 166
 167         rcu_read_lock();
 168         ppid = pid_alive(p) ?
 169                 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
 170         tpid = 0;
 171         if (pid_alive(p)) {
 172                 struct task_struct *tracer = tracehook_tracer_task(p);
 173                 if (tracer)
 174                         tpid = task_pid_nr_ns(tracer, ns);
 175         }
 176         cred = get_cred((struct cred *) __task_cred(p));
 177         seq_printf(m,
 178                 "State:\t%s\n"
 179                 "Tgid:\t%d\n"
 180                 "Pid:\t%d\n"
 181                 "PPid:\t%d\n"
 182                 "TracerPid:\t%d\n"
 183                 "Uid:\t%d\t%d\t%d\t%d\n"
 184                 "Gid:\t%d\t%d\t%d\t%d\n",
 185                 get_task_state(p),
 186                 task_tgid_nr_ns(p, ns),
 187                 pid_nr_ns(pid, ns),
 188                 ppid, tpid,
 189                 cred->uid, cred->euid, cred->suid, cred->fsuid,
 190                 cred->gid, cred->egid, cred->sgid, cred->fsgid);
 191
 192         task_lock(p);
 193         if (p->files)
 194                 fdt = files_fdtable(p->files);
 195         seq_printf(m,
 196                 "FDSize:\t%d\n"
 197                 "Groups:\t",
 198                 fdt ? fdt->max_fds : 0);
 199         rcu_read_unlock();
 200
 201         group_info = cred->group_info;
 202         task_unlock(p);
 203
 204         for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
 205                 seq_printf(m, "%d ", GROUP_AT(group_info, g));
 206         put_cred(cred);
 207
 208         seq_printf(m, "\n");
 209 }
 210
 211 static void render_sigset_t(struct seq_file *m, const char *header,
 212                                 sigset_t *set)
 213 {
 214         int i;
 215
 216         seq_printf(m, "%s", header);
 217
 218         i = _NSIG;
 219         do {
 220                 int x = 0;
 221
 222                 i -= 4;
 223                 if (sigismember(set, i+1)) x |= 1;
 224                 if (sigismember(set, i+2)) x |= 2;
 225                 if (sigismember(set, i+3)) x |= 4;
 226                 if (sigismember(set, i+4)) x |= 8;
 227                 seq_printf(m, "%x", x);
 228         } while (i >= 4);
 229
 230         seq_printf(m, "\n");
 231 }
 232
 233 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 234                                     sigset_t *catch)
 235 {
 236         struct k_sigaction *k;
 237         int i;
 238
 239         k = p->sighand->action;
 240         for (i = 1; i <= _NSIG; ++i, ++k) {
 241                 if (k->sa.sa_handler == SIG_IGN)
 242                         sigaddset(ign, i);
 243                 else if (k->sa.sa_handler != SIG_DFL)
 244                         sigaddset(catch, i);
 245         }
 246 }
 247
 248 static inline void task_sig(struct seq_file *m, struct task_struct *p)
 249 {
 250         unsigned long flags;
 251         sigset_t pending, shpending, blocked, ignored, caught;
 252         int num_threads = 0;
 253         unsigned long qsize = 0;
 254         unsigned long qlim = 0;
 255
 256         sigemptyset(&pending);
 257         sigemptyset(&shpending);
 258         sigemptyset(&blocked);
 259         sigemptyset(&ignored);
 260         sigemptyset(&caught);
 261
 262         if (lock_task_sighand(p, &flags)) {
 263                 pending = p->pending.signal;
 264                 shpending = p->signal->shared_pending.signal;
 265                 blocked = p->blocked;
 266                 collect_sigign_sigcatch(p, &ignored, &caught);
 267                 num_threads = atomic_read(&p->signal->count);
 268                 qsize = atomic_read(&__task_cred(p)->user->sigpending);
 269                 qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
 270                 unlock_task_sighand(p, &flags);
 271         }
 272
 273         seq_printf(m, "Threads:\t%d\n", num_threads);
 274         seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
 275
 276         /* render them all */
 277         render_sigset_t(m, "SigPnd:\t", &pending);
 278         render_sigset_t(m, "ShdPnd:\t", &shpending);
 279         render_sigset_t(m, "SigBlk:\t", &blocked);
 280         render_sigset_t(m, "SigIgn:\t", &ignored);
 281         render_sigset_t(m, "SigCgt:\t", &caught);
 282 }
 283
 284 static void render_cap_t(struct seq_file *m, const char *header,
 285                         kernel_cap_t *a)
 286 {
 287         unsigned __capi;
 288
 289         seq_printf(m, "%s", header);
 290         CAP_FOR_EACH_U32(__capi) {
 291                 seq_printf(m, "%08x",
 292                            a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
 293         }
 294         seq_printf(m, "\n");
 295 }
 296
 297 static inline void task_cap(struct seq_file *m, struct task_struct *p)
 298 {
 299         const struct cred *cred;
 300         kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
 301
 302         rcu_read_lock();
 303         cred = __task_cred(p);
 304         cap_inheritable = cred->cap_inheritable;
 305         cap_permitted   = cred->cap_permitted;
 306         cap_effective   = cred->cap_effective;
 307         cap_bset        = cred->cap_bset;
 308         rcu_read_unlock();
 309
 310         render_cap_t(m, "CapInh:\t", &cap_inheritable);
 311         render_cap_t(m, "CapPrm:\t", &cap_permitted);
 312         render_cap_t(m, "CapEff:\t", &cap_effective);
 313         render_cap_t(m, "CapBnd:\t", &cap_bset);
 314 }
 315
 316 static inline void task_context_switch_counts(struct seq_file *m,
 317                                                 struct task_struct *p)
 318 {
 319         seq_printf(m,   "voluntary_ctxt_switches:\t%lu\n"
 320                         "nonvoluntary_ctxt_switches:\t%lu\n",
 321                         p->nvcsw,
 322                         p->nivcsw);
 323 }
 324
 325 #ifdef CONFIG_MMU
 326
 327 struct stack_stats {
 328         struct vm_area_struct *vma;
 329         unsigned long   startpage;
 330         unsigned long   usage;
 331 };
 332
 333 static int stack_usage_pte_range(pmd_t *pmd, unsigned long addr,
 334                                 unsigned long end, struct mm_walk *walk)
 335 {
 336         struct stack_stats *ss = walk->private;
 337         struct vm_area_struct *vma = ss->vma;
 338         pte_t *pte, ptent;
 339         spinlock_t *ptl;
 340         int ret = 0;
 341
 342         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 343         for (; addr != end; pte++, addr += PAGE_SIZE) {
 344                 ptent = *pte;
 345
 346 #ifdef CONFIG_STACK_GROWSUP
 347                 if (pte_present(ptent) || is_swap_pte(ptent))
 348                         ss->usage = addr - ss->startpage + PAGE_SIZE;
 349 #else
 350                 if (pte_present(ptent) || is_swap_pte(ptent)) {
 351                         ss->usage = ss->startpage - addr + PAGE_SIZE;
 352                         pte++;
 353                         ret = 1;
 354                         break;
 355                 }
 356 #endif
 357         }
 358         pte_unmap_unlock(pte - 1, ptl);
 359         cond_resched();
 360         return ret;
 361 }
 362
 363 static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct *vma,
 364                                 struct task_struct *task)
 365 {
 366         struct stack_stats ss;
 367         struct mm_walk stack_walk = {
 368                 .pmd_entry = stack_usage_pte_range,
 369                 .mm = vma->vm_mm,
 370                 .private = &ss,
 371         };
 372
 373         if (!vma->vm_mm || is_vm_hugetlb_page(vma))
 374                 return 0;
 375
 376         ss.vma = vma;
 377         ss.startpage = task->stack_start & PAGE_MASK;
 378         ss.usage = 0;
 379
 380 #ifdef CONFIG_STACK_GROWSUP
 381         walk_page_range(KSTK_ESP(task) & PAGE_MASK, vma->vm_end,
 382                 &stack_walk);
 383 #else
 384         walk_page_range(vma->vm_start, (KSTK_ESP(task) & PAGE_MASK) + PAGE_SIZE,
 385                 &stack_walk);
 386 #endif
 387         return ss.usage;
 388 }
 389
 390 static inline void task_show_stack_usage(struct seq_file *m,
 391                                                 struct task_struct *task)
 392 {
 393         struct vm_area_struct   *vma;
 394         struct mm_struct        *mm = get_task_mm(task);
 395
 396         if (mm) {
 397                 down_read(&mm->mmap_sem);
 398                 vma = find_vma(mm, task->stack_start);
 399                 if (vma)
 400                         seq_printf(m, "Stack usage:\t%lu kB\n",
 401                                 get_stack_usage_in_bytes(vma, task) >> 10);
 402
 403                 up_read(&mm->mmap_sem);
 404                 mmput(mm);
 405         }
 406 }
 407 #else
 408 static void task_show_stack_usage(struct seq_file *m, struct task_struct *task)
 409 {
 410 }
 411 #endif          /* CONFIG_MMU */
 412
 413 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 414                         struct pid *pid, struct task_struct *task)
 415 {
 416         struct mm_struct *mm = get_task_mm(task);
 417
 418         task_name(m, task);
 419         task_state(m, ns, pid, task);
 420
 421         if (mm) {
 422                 task_mem(m, mm);
 423                 mmput(mm);
 424         }
 425         task_sig(m, task);
 426         task_cap(m, task);
 427         cpuset_task_status_allowed(m, task);
 428 #if defined(CONFIG_S390)
 429         task_show_regs(m, task);
 430 #endif
 431         task_context_switch_counts(m, task);
 432         task_show_stack_usage(m, task);
 433         return 0;
 434 }
 435
 436 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 437                         struct pid *pid, struct task_struct *task, int whole)
 438 {
 439         unsigned long vsize, eip, esp, wchan = ~0UL;
 440         long priority, nice;
 441         int tty_pgrp = -1, tty_nr = 0;
 442         sigset_t sigign, sigcatch;
 443         char state;
 444         pid_t ppid = 0, pgid = -1, sid = -1;
 445         int num_threads = 0;
 446         int permitted;
 447         struct mm_struct *mm;
 448         unsigned long long start_time;
 449         unsigned long cmin_flt = 0, cmaj_flt = 0;
 450         unsigned long  min_flt = 0,  maj_flt = 0;
 451         cputime_t cutime, cstime, utime, stime;
 452         cputime_t cgtime, gtime;
 453         unsigned long rsslim = 0;
 454         char tcomm[sizeof(task->comm)];
 455         unsigned long flags;
 456
 457         state = *get_task_state(task);
 458         vsize = eip = esp = 0;
 459         permitted = ptrace_may_access(task, PTRACE_MODE_READ);
 460         mm = get_task_mm(task);
 461         if (mm) {
 462                 vsize = task_vsize(mm);
 463                 if (permitted) {
 464                         eip = KSTK_EIP(task);
 465                         esp = KSTK_ESP(task);
 466                 }
 467         }
 468
 469         get_task_comm(tcomm, task);
 470
 471         sigemptyset(&sigign);
 472         sigemptyset(&sigcatch);
 473         cutime = cstime = utime = stime = cputime_zero;
 474         cgtime = gtime = cputime_zero;
 475
 476         if (lock_task_sighand(task, &flags)) {
 477                 struct signal_struct *sig = task->signal;
 478
 479                 if (sig->tty) {
 480                         struct pid *pgrp = tty_get_pgrp(sig->tty);
 481                         tty_pgrp = pid_nr_ns(pgrp, ns);
 482                         put_pid(pgrp);
 483                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
 484                 }
 485
 486                 num_threads = atomic_read(&sig->count);
 487                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
 488
 489                 cmin_flt = sig->cmin_flt;
 490                 cmaj_flt = sig->cmaj_flt;
 491                 cutime = sig->cutime;
 492                 cstime = sig->cstime;
 493                 cgtime = sig->cgtime;
 494                 rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
 495
 496                 /* add up live thread stats at the group level */
 497                 if (whole) {
 498                         struct task_cputime cputime;
 499                         struct task_struct *t = task;
 500                         do {
 501                                 min_flt += t->min_flt;
 502                                 maj_flt += t->maj_flt;
 503                                 gtime = cputime_add(gtime, task_gtime(t));
 504                                 t = next_thread(t);
 505                         } while (t != task);
 506
 507                         min_flt += sig->min_flt;
 508                         maj_flt += sig->maj_flt;
 509                         thread_group_cputime(task, &cputime);
 510                         utime = cputime.utime;
 511                         stime = cputime.stime;
 512                         gtime = cputime_add(gtime, sig->gtime);
 513                 }
 514
 515                 sid = task_session_nr_ns(task, ns);
 516                 ppid = task_tgid_nr_ns(task->real_parent, ns);
 517                 pgid = task_pgrp_nr_ns(task, ns);
 518
 519                 unlock_task_sighand(task, &flags);
 520         }
 521
 522         if (permitted && (!whole || num_threads < 2))
 523                 wchan = get_wchan(task);
 524         if (!whole) {
 525                 min_flt = task->min_flt;
 526                 maj_flt = task->maj_flt;
 527                 utime = task_utime(task);
 528                 stime = task_stime(task);
 529                 gtime = task_gtime(task);
 530         }
 531
 532         /* scale priority and nice values from timeslices to -20..20 */
 533         /* to make it look like a "normal" Unix priority/nice value  */
 534         priority = task_prio(task);
 535         nice = task_nice(task);
 536
 537         /* Temporary variable needed for gcc-2.96 */
 538         /* convert timespec -> nsec*/
 539         start_time =
 540                 (unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
 541                                 + task->real_start_time.tv_nsec;
 542         /* convert nsec -> ticks */
 543         start_time = nsec_to_clock_t(start_time);
 544
 545         seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
 546 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
 547 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
 548                 pid_nr_ns(pid, ns),
 549                 tcomm,
 550                 state,
 551                 ppid,
 552                 pgid,
 553                 sid,
 554                 tty_nr,
 555                 tty_pgrp,
 556                 task->flags,
 557                 min_flt,
 558                 cmin_flt,
 559                 maj_flt,
 560                 cmaj_flt,
 561                 cputime_to_clock_t(utime),
 562                 cputime_to_clock_t(stime),
 563                 cputime_to_clock_t(cutime),
 564                 cputime_to_clock_t(cstime),
 565                 priority,
 566                 nice,
 567                 num_threads,
 568                 start_time,
 569                 vsize,
 570                 mm ? get_mm_rss(mm) : 0,
 571                 rsslim,
 572                 mm ? mm->start_code : 0,
 573                 mm ? mm->end_code : 0,
 574                 (permitted) ? task->stack_start : 0,
 575                 esp,
 576                 eip,
 577                 /* The signal information here is obsolete.
 578                  * It must be decimal for Linux 2.0 compatibility.
 579                  * Use /proc/#/status for real-time signals.
 580                  */
 581                 task->pending.signal.sig[0] & 0x7fffffffUL,
 582                 task->blocked.sig[0] & 0x7fffffffUL,
 583                 sigign      .sig[0] & 0x7fffffffUL,
 584                 sigcatch    .sig[0] & 0x7fffffffUL,
 585                 wchan,
 586                 0UL,
 587                 0UL,
 588                 task->exit_signal,
 589                 task_cpu(task),
 590                 task->rt_priority,
 591                 task->policy,
 592                 (unsigned long long)delayacct_blkio_ticks(task),
 593                 cputime_to_clock_t(gtime),
 594                 cputime_to_clock_t(cgtime));
 595         if (mm)
 596                 mmput(mm);
 597         return 0;
 598 }
 599
 600 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
 601                         struct pid *pid, struct task_struct *task)
 602 {
 603         return do_task_stat(m, ns, pid, task, 0);
 604 }
 605
 606 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
 607                         struct pid *pid, struct task_struct *task)
 608 {
 609         return do_task_stat(m, ns, pid, task, 1);
 610 }
 611
 612 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 613                         struct pid *pid, struct task_struct *task)
 614 {
 615         int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
 616         struct mm_struct *mm = get_task_mm(task);
 617
 618         if (mm) {
 619                 size = task_statm(mm, &shared, &text, &data, &resident);
 620                 mmput(mm);
 621         }
 622         seq_printf(m, "%d %d %d %d %d %d %d\n",
 623                         size, resident, shared, text, lib, data, 0);
 624
 625         return 0;
 626 }