linux/fs/proc/array.c
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   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
  89static 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 */
 134static 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        "x (dead)",             /*  64 */
 143        "K (wakekill)",         /* 128 */
 144        "W (waking)",           /* 256 */
 145};
 146
 147static 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 **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
 161static 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_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
 214static 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
 236static 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
 251static 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
 289static 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
 302static 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
 321static 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
 330static 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
 340int 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
 360static 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);
 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 = cputime_zero;
 398        cgtime = gtime = cputime_zero;
 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 = cputime_add(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 = cputime_add(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\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        if (mm)
 516                mmput(mm);
 517        return 0;
 518}
 519
 520int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
 521                        struct pid *pid, struct task_struct *task)
 522{
 523        return do_task_stat(m, ns, pid, task, 0);
 524}
 525
 526int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
 527                        struct pid *pid, struct task_struct *task)
 528{
 529        return do_task_stat(m, ns, pid, task, 1);
 530}
 531
 532int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 533                        struct pid *pid, struct task_struct *task)
 534{
 535        unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
 536        struct mm_struct *mm = get_task_mm(task);
 537
 538        if (mm) {
 539                size = task_statm(mm, &shared, &text, &data, &resident);
 540                mmput(mm);
 541        }
 542        seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
 543                        size, resident, shared, text, data);
 544
 545        return 0;
 546}
 547