execute.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <assert.h>
  23 #include <dirent.h>
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <unistd.h>
  27 #include <string.h>
  28 #include <signal.h>
  29 #include <sys/socket.h>
  30 #include <sys/un.h>
  31 #include <sys/prctl.h>
  32 #include <linux/sched.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35
  36 #include "execute.h"
  37 #include "strv.h"
  38 #include "macro.h"
  39 #include "util.h"
  40 #include "log.h"
  41 #include "ioprio.h"
  42 #include "securebits.h"
  43
  44 static int close_fds(int except[], unsigned n_except) {
  45         DIR *d;
  46         struct dirent *de;
  47         int r = 0;
  48
  49         /* Modifies the fds array! (sorts it) */
  50
  51         if (!(d = opendir("/proc/self/fd")))
  52                 return -errno;
  53
  54         while ((de = readdir(d))) {
  55                 int fd;
  56
  57                 if (de->d_name[0] == '.')
  58                         continue;
  59
  60                 if ((r = safe_atoi(de->d_name, &fd)) < 0)
  61                         goto finish;
  62
  63                 if (fd < 3)
  64                         continue;
  65
  66                 if (fd == dirfd(d))
  67                         continue;
  68
  69                 if (except) {
  70                         bool found;
  71                         unsigned i;
  72
  73                         found = false;
  74                         for (i = 0; i < n_except; i++)
  75                                 if (except[i] == fd) {
  76                                         found = true;
  77                                         break;
  78                                 }
  79
  80                         if (found)
  81                                 continue;
  82                 }
  83
  84                 if ((r = close_nointr(fd)) < 0)
  85                         goto finish;
  86         }
  87
  88 finish:
  89         closedir(d);
  90         return r;
  91 }
  92
  93 static int shift_fds(int fds[], unsigned n_fds) {
  94         int start, restart_from;
  95
  96         if (n_fds <= 0)
  97                 return 0;
  98
  99         assert(fds);
 100
 101         start = 0;
 102         for (;;) {
 103                 int i;
 104
 105                 restart_from = -1;
 106
 107                 for (i = start; i < (int) n_fds; i++) {
 108                         int nfd;
 109
 110                         /* Already at right index? */
 111                         if (fds[i] == i+3)
 112                                 continue;
 113
 114                         if ((nfd = fcntl(fds[i], F_DUPFD, i+3)) < 0)
 115                                 return -errno;
 116
 117                         assert_se(close_nointr(fds[i]) == 0);
 118                         fds[i] = nfd;
 119
 120                         /* Hmm, the fd we wanted isn't free? Then
 121                          * let's remember that and try again from here*/
 122                         if (nfd != i+3 && restart_from < 0)
 123                                 restart_from = i;
 124                 }
 125
 126                 if (restart_from < 0)
 127                         break;
 128
 129                 start = restart_from;
 130         }
 131
 132         return 0;
 133 }
 134
 135 static int flags_fds(int fds[], unsigned n_fds, bool nonblock) {
 136         unsigned i;
 137
 138         if (n_fds <= 0)
 139                 return 0;
 140
 141         assert(fds);
 142
 143         /* Drops/Sets O_NONBLOCK and FD_CLOEXEC from the file flags */
 144
 145         for (i = 0; i < n_fds; i++) {
 146                 int flags;
 147
 148                 if ((flags = fcntl(fds[i], F_GETFL, 0)) < 0)
 149                         return -errno;
 150
 151                 if (nonblock)
 152                         flags |= O_NONBLOCK;
 153                 else
 154                         flags &= ~O_NONBLOCK;
 155
 156                 if (fcntl(fds[i], F_SETFL, flags) < 0)
 157                         return -errno;
 158
 159                 /* We unconditionally drop FD_CLOEXEC from the fds,
 160                  * since after all we want to pass these fds to our
 161                  * children */
 162                 if ((flags = fcntl(fds[i], F_GETFD, 0)) < 0)
 163                         return -errno;
 164
 165                 if (fcntl(fds[i], F_SETFD, flags &~FD_CLOEXEC) < 0)
 166                         return -errno;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int replace_null_fd(int fd, int flags) {
 173         int nfd;
 174         assert(fd >= 0);
 175
 176         close_nointr(fd);
 177
 178         if ((nfd = open("/dev/null", flags|O_NOCTTY)) < 0)
 179                 return -errno;
 180
 181         if (nfd != fd) {
 182                 close_nointr_nofail(nfd);
 183                 return -EIO;
 184         }
 185
 186         return 0;
 187 }
 188
 189 static int setup_output(const ExecContext *context, const char *ident) {
 190         int r;
 191
 192         assert(context);
 193
 194         switch (context->output) {
 195
 196         case EXEC_OUTPUT_CONSOLE:
 197                 return 0;
 198
 199         case EXEC_OUTPUT_NULL:
 200
 201                 if ((r = replace_null_fd(STDOUT_FILENO, O_WRONLY)) < 0 ||
 202                     (r = replace_null_fd(STDERR_FILENO, O_WRONLY)) < 0)
 203                         return r;
 204
 205                 return 0;
 206
 207         case EXEC_OUTPUT_KERNEL:
 208         case EXEC_OUTPUT_SYSLOG: {
 209
 210                 int fd;
 211                 union {
 212                         struct sockaddr sa;
 213                         struct sockaddr_un un;
 214                 } sa;
 215
 216                 close_nointr(STDOUT_FILENO);
 217                 close_nointr(STDERR_FILENO);
 218
 219                 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
 220                         return -errno;
 221
 222                 if (fd != STDOUT_FILENO) {
 223                         close_nointr_nofail(fd);
 224                         return -EIO;
 225                 }
 226
 227                 zero(sa);
 228                 sa.sa.sa_family = AF_UNIX;
 229                 strncpy(sa.un.sun_path+1, LOGGER_SOCKET, sizeof(sa.un.sun_path)-1);
 230
 231                 if (connect(fd, &sa.sa, sizeof(sa)) < 0) {
 232                         close_nointr_nofail(fd);
 233                         return -errno;
 234                 }
 235
 236                 if (shutdown(fd, SHUT_RD) < 0) {
 237                         close_nointr_nofail(fd);
 238                         return -errno;
 239                 }
 240
 241                 if ((fd = dup(fd)) < 0) {
 242                         close_nointr_nofail(fd);
 243                         return -errno;
 244                 }
 245
 246                 if (fd != STDERR_FILENO) {
 247                         close_nointr_nofail(fd);
 248                         return -EIO;
 249                 }
 250
 251                 /* We speak a very simple protocol between log server
 252                  * and client: one line for the log destination (kmsg
 253                  * or syslog), followed by the priority field,
 254                  * followed by the process name. Since we replaced
 255                  * stdin/stderr we simple use stdio to write to
 256                  * it. Note that we use stderr, to minimize buffer
 257                  * flushing issues. */
 258
 259                 fprintf(stderr,
 260                         "%s\n"
 261                         "%i\n"
 262                         "%s\n",
 263                         context->output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
 264                         context->syslog_priority,
 265                         context->syslog_identifier ? context->syslog_identifier : ident);
 266
 267                 return 0;
 268         }
 269
 270         default:
 271                 assert_not_reached("Unknown output type");
 272         }
 273 }
 274
 275 static int setup_input(const ExecContext *context) {
 276         int r;
 277
 278         assert(context);
 279
 280         switch (context->input) {
 281
 282         case EXEC_INPUT_CONSOLE:
 283                 return 0;
 284
 285         case EXEC_INPUT_NULL:
 286                 if ((r = replace_null_fd(STDIN_FILENO, O_RDONLY)) < 0)
 287                         return r;
 288
 289                 return 0;
 290
 291         default:
 292                 assert_not_reached("Unknown input type");
 293         }
 294 }
 295
 296 int exec_spawn(const ExecCommand *command, const ExecContext *context, int *fds, unsigned n_fds, pid_t *ret) {
 297         pid_t pid;
 298
 299         assert(command);
 300         assert(context);
 301         assert(ret);
 302         assert(fds || n_fds <= 0);
 303
 304         log_debug("about to execute %s", command->path);
 305
 306         if ((pid = fork()) < 0)
 307                 return -errno;
 308
 309         if (pid == 0) {
 310                 char **e, **f = NULL;
 311                 int i, r;
 312                 sigset_t ss;
 313
 314                 /* child */
 315
 316                 if (sigemptyset(&ss) < 0 ||
 317                     sigprocmask(SIG_SETMASK, &ss, NULL) < 0) {
 318                         r = EXIT_SIGNAL_MASK;
 319                         goto fail;
 320                 }
 321
 322                 if (setpgid(0, 0) < 0) {
 323                         r = EXIT_PGID;
 324                         goto fail;
 325                 }
 326
 327                 umask(context->umask);
 328
 329                 if (setup_input(context) < 0) {
 330                         r = EXIT_INPUT;
 331                         goto fail;
 332                 }
 333
 334                 if (setup_output(context, file_name_from_path(command->path)) < 0) {
 335                         r = EXIT_OUTPUT;
 336                         goto fail;
 337                 }
 338
 339                 if (context->oom_adjust_set) {
 340                         char t[16];
 341
 342                         snprintf(t, sizeof(t), "%i", context->oom_adjust);
 343                         char_array_0(t);
 344
 345                         if (write_one_line_file("/proc/self/oom_adj", t) < 0) {
 346                                 r = EXIT_OOM_ADJUST;
 347                                 goto fail;
 348                         }
 349                 }
 350
 351                 if (context->root_directory)
 352                         if (chroot(context->root_directory) < 0) {
 353                                 r = EXIT_CHROOT;
 354                                 goto fail;
 355                         }
 356
 357                 if (chdir(context->working_directory ? context->working_directory : "/") < 0) {
 358                         r = EXIT_CHDIR;
 359                         goto fail;
 360                 }
 361
 362                 if (context->nice_set)
 363                         if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
 364                                 r = EXIT_NICE;
 365                                 goto fail;
 366                         }
 367
 368                 if (context->cpu_sched_set) {
 369                         struct sched_param param;
 370
 371                         zero(param);
 372                         param.sched_priority = context->cpu_sched_priority;
 373
 374                         if (sched_setscheduler(0, context->cpu_sched_policy |
 375                                                (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), &param) < 0) {
 376                                 r = EXIT_SETSCHEDULER;
 377                                 goto fail;
 378                         }
 379                 }
 380
 381                 if (context->cpu_affinity_set)
 382                         if (sched_setaffinity(0, sizeof(context->cpu_affinity), &context->cpu_affinity) < 0) {
 383                                 r = EXIT_CPUAFFINITY;
 384                                 goto fail;
 385                         }
 386
 387                 if (context->ioprio_set)
 388                         if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) {
 389                                 r = EXIT_IOPRIO;
 390                                 goto fail;
 391                         }
 392
 393                 if (context->timer_slack_ns_set)
 394                         if (prctl(PR_SET_TIMERSLACK, context->timer_slack_ns_set) < 0) {
 395                                 r = EXIT_TIMERSLACK;
 396                                 goto fail;
 397                         }
 398
 399                 if (close_fds(fds, n_fds) < 0 ||
 400                     shift_fds(fds, n_fds) < 0 ||
 401                     flags_fds(fds, n_fds, context->non_blocking) < 0) {
 402                         r = EXIT_FDS;
 403                         goto fail;
 404                 }
 405
 406                 for (i = 0; i < RLIMIT_NLIMITS; i++) {
 407                         if (!context->rlimit[i])
 408                                 continue;
 409
 410                         if (setrlimit(i, context->rlimit[i]) < 0) {
 411                                 r = EXIT_LIMITS;
 412                                 goto fail;
 413                         }
 414                 }
 415
 416                 if (context->secure_bits) {
 417                         if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) {
 418                                 r = EXIT_SECUREBITS;
 419                                 goto fail;
 420                         }
 421                 }
 422
 423                 if (n_fds > 0) {
 424                         char a[64], b[64];
 425                         char *listen_env[3] = {
 426                                 a,
 427                                 b,
 428                                 NULL
 429                         };
 430
 431                         snprintf(a, sizeof(a), "LISTEN_PID=%llu", (unsigned long long) getpid());
 432                         snprintf(b, sizeof(b), "LISTEN_FDS=%u", n_fds);
 433
 434                         a[sizeof(a)-1] = 0;
 435                         b[sizeof(b)-1] = 0;
 436
 437                         if (context->environment) {
 438                                 if (!(f = strv_merge(listen_env, context->environment))) {
 439                                         r = EXIT_MEMORY;
 440                                         goto fail;
 441                                 }
 442                                 e = f;
 443                         } else
 444                                 e = listen_env;
 445
 446                 } else
 447                         e = context->environment;
 448
 449                 execve(command->path, command->argv, e);
 450                 r = EXIT_EXEC;
 451
 452         fail:
 453                 strv_free(f);
 454                 _exit(r);
 455         }
 456
 457
 458         log_debug("executed %s as %llu", command->path, (unsigned long long) pid);
 459
 460         *ret = pid;
 461         return 0;
 462 }
 463
 464 void exec_context_init(ExecContext *c) {
 465         assert(c);
 466
 467         c->umask = 0002;
 468         c->oom_adjust = 0;
 469         c->oom_adjust_set = false;
 470         c->nice = 0;
 471         c->nice_set = false;
 472         c->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 0);
 473         c->ioprio_set = false;
 474         c->cpu_sched_policy = SCHED_OTHER;
 475         c->cpu_sched_priority = 0;
 476         c->cpu_sched_set = false;
 477         CPU_ZERO(&c->cpu_affinity);
 478         c->cpu_affinity_set = false;
 479
 480         c->input = 0;
 481         c->output = 0;
 482         c->syslog_priority = LOG_DAEMON|LOG_INFO;
 483
 484         c->secure_bits = 0;
 485         c->capability_bounding_set_drop = 0;
 486 }
 487
 488 void exec_context_done(ExecContext *c) {
 489         unsigned l;
 490
 491         assert(c);
 492
 493         strv_free(c->environment);
 494         c->environment = NULL;
 495
 496         for (l = 0; l < ELEMENTSOF(c->rlimit); l++) {
 497                 free(c->rlimit[l]);
 498                 c->rlimit[l] = NULL;
 499         }
 500
 501         free(c->working_directory);
 502         c->working_directory = NULL;
 503         free(c->root_directory);
 504         c->root_directory = NULL;
 505
 506         free(c->syslog_identifier);
 507         c->syslog_identifier = NULL;
 508
 509         free(c->user);
 510         c->user = NULL;
 511
 512         free(c->group);
 513         c->group = NULL;
 514
 515         strv_free(c->supplementary_groups);
 516         c->supplementary_groups = NULL;
 517
 518         if (c->capabilities) {
 519                 cap_free(c->capabilities);
 520                 c->capabilities = NULL;
 521         }
 522 }
 523
 524 void exec_command_free_list(ExecCommand *c) {
 525         ExecCommand *i;
 526
 527         while ((i = c)) {
 528                 LIST_REMOVE(ExecCommand, command, c, i);
 529
 530                 free(i->path);
 531                 strv_free(i->argv);
 532                 free(i);
 533         }
 534 }
 535
 536 void exec_command_free_array(ExecCommand **c, unsigned n) {
 537         unsigned i;
 538
 539         for (i = 0; i < n; i++) {
 540                 exec_command_free_list(c[i]);
 541                 c[i] = NULL;
 542         }
 543 }
 544
 545 void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
 546         char ** e;
 547         unsigned i;
 548
 549         assert(c);
 550         assert(f);
 551
 552         if (!prefix)
 553                 prefix = "";
 554
 555         fprintf(f,
 556                 "%sUMask: %04o\n"
 557                 "%sWorkingDirectory: %s\n"
 558                 "%sRootDirectory: %s\n"
 559                 "%sNonBlocking: %s\n",
 560                 prefix, c->umask,
 561                 prefix, c->working_directory ? c->working_directory : "/",
 562                 prefix, c->root_directory ? c->root_directory : "/",
 563                 prefix, yes_no(c->non_blocking));
 564
 565         if (c->environment)
 566                 for (e = c->environment; *e; e++)
 567                         fprintf(f, "%sEnvironment: %s\n", prefix, *e);
 568
 569         if (c->nice_set)
 570                 fprintf(f,
 571                         "%sNice: %i\n",
 572                         prefix, c->nice);
 573
 574         if (c->oom_adjust_set)
 575                 fprintf(f,
 576                         "%sOOMAdjust: %i\n",
 577                         prefix, c->oom_adjust);
 578
 579         for (i = 0; i < RLIM_NLIMITS; i++)
 580                 if (c->rlimit[i])
 581                         fprintf(f, "%s%s: %llu\n", prefix, rlimit_to_string(i), (unsigned long long) c->rlimit[i]->rlim_max);
 582
 583         if (c->ioprio_set)
 584                 fprintf(f,
 585                         "%sIOSchedulingClass: %s\n"
 586                         "%sIOPriority: %i\n",
 587                         prefix, ioprio_class_to_string(IOPRIO_PRIO_CLASS(c->ioprio)),
 588                         prefix, (int) IOPRIO_PRIO_DATA(c->ioprio));
 589
 590         if (c->cpu_sched_set)
 591                 fprintf(f,
 592                         "%sCPUSchedulingPolicy: %s\n"
 593                         "%sCPUSchedulingPriority: %i\n"
 594                         "%sCPUSchedulingResetOnFork: %s\n",
 595                         prefix, sched_policy_to_string(c->cpu_sched_policy),
 596                         prefix, c->cpu_sched_priority,
 597                         prefix, yes_no(c->cpu_sched_reset_on_fork));
 598
 599         if (c->cpu_affinity_set) {
 600                 fprintf(f, "%sCPUAffinity:", prefix);
 601                 for (i = 0; i < CPU_SETSIZE; i++)
 602                         if (CPU_ISSET(i, &c->cpu_affinity))
 603                                 fprintf(f, " %i", i);
 604                 fputs("\n", f);
 605         }
 606
 607         if (c->timer_slack_ns_set)
 608                 fprintf(f, "%sTimerSlackNS: %lu\n", prefix, c->timer_slack_ns);
 609
 610         fprintf(f,
 611                 "%sInput: %s\n"
 612                 "%sOutput: %s\n",
 613                 prefix, exec_input_to_string(c->input),
 614                 prefix, exec_output_to_string(c->output));
 615
 616         if (c->output == EXEC_OUTPUT_SYSLOG || c->output == EXEC_OUTPUT_KERNEL)
 617                 fprintf(f,
 618                         "%sSyslogFacility: %s\n"
 619                         "%sSyslogLevel: %s\n",
 620                         prefix, log_facility_to_string(LOG_FAC(c->syslog_priority)),
 621                         prefix, log_level_to_string(LOG_PRI(c->syslog_priority)));
 622
 623         if (c->capabilities) {
 624                 char *t;
 625                 if ((t = cap_to_text(c->capabilities, NULL))) {
 626                         fprintf(f, "%sCapabilities: %s\n",
 627                                 prefix, t);
 628                         cap_free(t);
 629                 }
 630         }
 631
 632         if (c->secure_bits)
 633                 fprintf(f, "%sSecure Bits:%s%s%s%s%s%s\n",
 634                         prefix,
 635                         (c->secure_bits & SECURE_KEEP_CAPS) ? " keep-caps" : "",
 636                         (c->secure_bits & SECURE_KEEP_CAPS_LOCKED) ? " keep-caps-locked" : "",
 637                         (c->secure_bits & SECURE_NO_SETUID_FIXUP) ? " no-setuid-fixup" : "",
 638                         (c->secure_bits & SECURE_NO_SETUID_FIXUP_LOCKED) ? " no-setuid-fixup-locked" : "",
 639                         (c->secure_bits & SECURE_NOROOT) ? " noroot" : "",
 640                         (c->secure_bits & SECURE_NOROOT_LOCKED) ? "noroot-locked" : "");
 641
 642         if (c->capability_bounding_set_drop) {
 643                 fprintf(f, "%sCapabilityBoundingSetDrop:", prefix);
 644
 645                 for (i = 0; i <= CAP_LAST_CAP; i++)
 646                         if (c->capability_bounding_set_drop & (1 << i)) {
 647                                 char *t;
 648
 649                                 if ((t = cap_to_name(i))) {
 650                                         fprintf(f, " %s", t);
 651                                         free(t);
 652                                 }
 653                         }
 654
 655                 fputs("\n", f);
 656         }
 657
 658         if (c->user)
 659                 fprintf(f, "%sUser: %s", prefix, c->user);
 660         if (c->group)
 661                 fprintf(f, "%sGroup: %s", prefix, c->group);
 662
 663         if (c->supplementary_groups) {
 664                 char **g;
 665
 666                 fprintf(f, "%sSupplementaryGroups:", prefix);
 667
 668                 STRV_FOREACH(g, c->supplementary_groups)
 669                         fprintf(f, " %s", *g);
 670
 671                 fputs("\n", f);
 672         }
 673 }
 674
 675 void exec_status_fill(ExecStatus *s, pid_t pid, int code, int status) {
 676         assert(s);
 677
 678         s->pid = pid;
 679         s->code = code;
 680         s->status = status;
 681         s->timestamp = now(CLOCK_REALTIME);
 682 }
 683
 684 char *exec_command_line(ExecCommand *c) {
 685         size_t k;
 686         char *n, *p, **a;
 687         bool first = true;
 688
 689         assert(c);
 690         assert(c->argv);
 691
 692         k = 1;
 693         STRV_FOREACH(a, c->argv)
 694                 k += strlen(*a)+3;
 695
 696         if (!(n = new(char, k)))
 697                 return NULL;
 698
 699         p = n;
 700         STRV_FOREACH(a, c->argv) {
 701
 702                 if (!first)
 703                         *(p++) = ' ';
 704                 else
 705                         first = false;
 706
 707                 if (strpbrk(*a, WHITESPACE)) {
 708                         *(p++) = '\'';
 709                         p = stpcpy(p, *a);
 710                         *(p++) = '\'';
 711                 } else
 712                         p = stpcpy(p, *a);
 713
 714         }
 715
 716         *p = 0;
 717
 718         /* FIXME: this doesn't really handle arguments that have
 719          * spaces and ticks in them */
 720
 721         return n;
 722 }
 723
 724 void exec_command_dump(ExecCommand *c, FILE *f, const char *prefix) {
 725         char *cmd;
 726
 727         assert(c);
 728         assert(f);
 729
 730         if (!prefix)
 731                 prefix = "";
 732
 733         cmd = exec_command_line(c);
 734
 735         fprintf(f,
 736                 "%sCommand Line: %s\n",
 737                 prefix, cmd ? cmd : strerror(ENOMEM));
 738
 739         free(cmd);
 740 }
 741
 742 void exec_command_dump_list(ExecCommand *c, FILE *f, const char *prefix) {
 743         assert(f);
 744
 745         if (!prefix)
 746                 prefix = "";
 747
 748         LIST_FOREACH(command, c, c)
 749                 exec_command_dump(c, f, prefix);
 750 }
 751
 752 static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
 753         [EXEC_OUTPUT_CONSOLE] = "console",
 754         [EXEC_OUTPUT_NULL] = "null",
 755         [EXEC_OUTPUT_SYSLOG] = "syslog",
 756         [EXEC_OUTPUT_KERNEL] = "kernel"
 757 };
 758
 759 DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
 760
 761 static const char* const exec_input_table[_EXEC_INPUT_MAX] = {
 762         [EXEC_INPUT_NULL] = "null",
 763         [EXEC_INPUT_CONSOLE] = "console"
 764 };
 765
 766 DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput);