The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_environment.c

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    1 /*-
    2  * Copyright (c) 1998 Michael Smith
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * The unified bootloader passes us a pointer to a preserved copy of
   29  * bootstrap/kernel environment variables.  We convert them to a
   30  * dynamic array of strings later when the VM subsystem is up.
   31  *
   32  * We make these available through the kenv(2) syscall for userland
   33  * and through kern_getenv()/freeenv() kern_setenv() kern_unsetenv() testenv() for
   34  * the kernel.
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/11.1/sys/kern/kern_environment.c 298025 2016-04-15 03:09:55Z imp $");
   39 
   40 #include <sys/types.h>
   41 #include <sys/param.h>
   42 #include <sys/proc.h>
   43 #include <sys/queue.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mutex.h>
   47 #include <sys/priv.h>
   48 #include <sys/kernel.h>
   49 #include <sys/systm.h>
   50 #include <sys/sysent.h>
   51 #include <sys/sysproto.h>
   52 #include <sys/libkern.h>
   53 #include <sys/kenv.h>
   54 
   55 #include <security/mac/mac_framework.h>
   56 
   57 static MALLOC_DEFINE(M_KENV, "kenv", "kernel environment");
   58 
   59 #define KENV_SIZE       512     /* Maximum number of environment strings */
   60 
   61 /* pointer to the static environment */
   62 char            *kern_envp;
   63 static int      env_len;
   64 static int      env_pos;
   65 static char     *kernenv_next(char *);
   66 
   67 /* dynamic environment variables */
   68 char            **kenvp;
   69 struct mtx      kenv_lock;
   70 
   71 /*
   72  * No need to protect this with a mutex since SYSINITS are single threaded.
   73  */
   74 int     dynamic_kenv = 0;
   75 
   76 #define KENV_CHECK      if (!dynamic_kenv) \
   77                             panic("%s: called before SI_SUB_KMEM", __func__)
   78 
   79 int
   80 sys_kenv(td, uap)
   81         struct thread *td;
   82         struct kenv_args /* {
   83                 int what;
   84                 const char *name;
   85                 char *value;
   86                 int len;
   87         } */ *uap;
   88 {
   89         char *name, *value, *buffer = NULL;
   90         size_t len, done, needed, buflen;
   91         int error, i;
   92 
   93         KASSERT(dynamic_kenv, ("kenv: dynamic_kenv = 0"));
   94 
   95         error = 0;
   96         if (uap->what == KENV_DUMP) {
   97 #ifdef MAC
   98                 error = mac_kenv_check_dump(td->td_ucred);
   99                 if (error)
  100                         return (error);
  101 #endif
  102                 done = needed = 0;
  103                 buflen = uap->len;
  104                 if (buflen > KENV_SIZE * (KENV_MNAMELEN + KENV_MVALLEN + 2))
  105                         buflen = KENV_SIZE * (KENV_MNAMELEN +
  106                             KENV_MVALLEN + 2);
  107                 if (uap->len > 0 && uap->value != NULL)
  108                         buffer = malloc(buflen, M_TEMP, M_WAITOK|M_ZERO);
  109                 mtx_lock(&kenv_lock);
  110                 for (i = 0; kenvp[i] != NULL; i++) {
  111                         len = strlen(kenvp[i]) + 1;
  112                         needed += len;
  113                         len = min(len, buflen - done);
  114                         /*
  115                          * If called with a NULL or insufficiently large
  116                          * buffer, just keep computing the required size.
  117                          */
  118                         if (uap->value != NULL && buffer != NULL && len > 0) {
  119                                 bcopy(kenvp[i], buffer + done, len);
  120                                 done += len;
  121                         }
  122                 }
  123                 mtx_unlock(&kenv_lock);
  124                 if (buffer != NULL) {
  125                         error = copyout(buffer, uap->value, done);
  126                         free(buffer, M_TEMP);
  127                 }
  128                 td->td_retval[0] = ((done == needed) ? 0 : needed);
  129                 return (error);
  130         }
  131 
  132         switch (uap->what) {
  133         case KENV_SET:
  134                 error = priv_check(td, PRIV_KENV_SET);
  135                 if (error)
  136                         return (error);
  137                 break;
  138 
  139         case KENV_UNSET:
  140                 error = priv_check(td, PRIV_KENV_UNSET);
  141                 if (error)
  142                         return (error);
  143                 break;
  144         }
  145 
  146         name = malloc(KENV_MNAMELEN + 1, M_TEMP, M_WAITOK);
  147 
  148         error = copyinstr(uap->name, name, KENV_MNAMELEN + 1, NULL);
  149         if (error)
  150                 goto done;
  151 
  152         switch (uap->what) {
  153         case KENV_GET:
  154 #ifdef MAC
  155                 error = mac_kenv_check_get(td->td_ucred, name);
  156                 if (error)
  157                         goto done;
  158 #endif
  159                 value = kern_getenv(name);
  160                 if (value == NULL) {
  161                         error = ENOENT;
  162                         goto done;
  163                 }
  164                 len = strlen(value) + 1;
  165                 if (len > uap->len)
  166                         len = uap->len;
  167                 error = copyout(value, uap->value, len);
  168                 freeenv(value);
  169                 if (error)
  170                         goto done;
  171                 td->td_retval[0] = len;
  172                 break;
  173         case KENV_SET:
  174                 len = uap->len;
  175                 if (len < 1) {
  176                         error = EINVAL;
  177                         goto done;
  178                 }
  179                 if (len > KENV_MVALLEN + 1)
  180                         len = KENV_MVALLEN + 1;
  181                 value = malloc(len, M_TEMP, M_WAITOK);
  182                 error = copyinstr(uap->value, value, len, NULL);
  183                 if (error) {
  184                         free(value, M_TEMP);
  185                         goto done;
  186                 }
  187 #ifdef MAC
  188                 error = mac_kenv_check_set(td->td_ucred, name, value);
  189                 if (error == 0)
  190 #endif
  191                         kern_setenv(name, value);
  192                 free(value, M_TEMP);
  193                 break;
  194         case KENV_UNSET:
  195 #ifdef MAC
  196                 error = mac_kenv_check_unset(td->td_ucred, name);
  197                 if (error)
  198                         goto done;
  199 #endif
  200                 error = kern_unsetenv(name);
  201                 if (error)
  202                         error = ENOENT;
  203                 break;
  204         default:
  205                 error = EINVAL;
  206                 break;
  207         }
  208 done:
  209         free(name, M_TEMP);
  210         return (error);
  211 }
  212 
  213 /*
  214  * Populate the initial kernel environment.
  215  *
  216  * This is called very early in MD startup, either to provide a copy of the
  217  * environment obtained from a boot loader, or to provide an empty buffer into
  218  * which MD code can store an initial environment using kern_setenv() calls.
  219  *
  220  * When a copy of an initial environment is passed in, we start by scanning that
  221  * env for overrides to the compiled-in envmode and hintmode variables.
  222  *
  223  * If the global envmode is 1, the environment is initialized from the global
  224  * static_env[], regardless of the arguments passed.  This implements the env
  225  * keyword described in config(5).  In this case env_pos is set to env_len,
  226  * causing kern_setenv() to return -1 (if len > 0) or panic (if len == 0) until
  227  * the dynamic environment is available.  The envmode and static_env variables
  228  * are defined in env.c which is generated by config(8).
  229  *
  230  * If len is non-zero, the caller is providing an empty buffer.  The caller will
  231  * subsequently use kern_setenv() to add up to len bytes of initial environment
  232  * before the dynamic environment is available.
  233  *
  234  * If len is zero, the caller is providing a pre-loaded buffer containing
  235  * environment strings.  Additional strings cannot be added until the dynamic
  236  * environment is available.  The memory pointed to must remain stable at least
  237  * until sysinit runs init_dynamic_kenv().  If no initial environment is
  238  * available from the boot loader, passing a NULL pointer allows the static_env
  239  * to be installed if it is configured.
  240  */
  241 void
  242 init_static_kenv(char *buf, size_t len)
  243 {
  244         char *cp;
  245         
  246         for (cp = buf; cp != NULL && cp[0] != '\0'; cp += strlen(cp) + 1) {
  247                 if (strcmp(cp, "static_env.disabled=1") == 0)
  248                         envmode = 0;
  249                 if (strcmp(cp, "static_hints.disabled=1") == 0)
  250                         hintmode = 0;
  251         }
  252 
  253         if (envmode == 1) {
  254                 kern_envp = static_env;
  255                 env_len = len;
  256                 env_pos = len;
  257         } else {
  258                 kern_envp = buf;
  259                 env_len = len;
  260                 env_pos = 0;
  261         }
  262 }
  263 
  264 /*
  265  * Setup the dynamic kernel environment.
  266  */
  267 static void
  268 init_dynamic_kenv(void *data __unused)
  269 {
  270         char *cp, *cpnext;
  271         size_t len;
  272         int i;
  273 
  274         kenvp = malloc((KENV_SIZE + 1) * sizeof(char *), M_KENV,
  275                 M_WAITOK | M_ZERO);
  276         i = 0;
  277         if (kern_envp && *kern_envp != '\0') {
  278                 for (cp = kern_envp; cp != NULL; cp = cpnext) {
  279                         cpnext = kernenv_next(cp);
  280                         len = strlen(cp) + 1;
  281                         if (len > KENV_MNAMELEN + 1 + KENV_MVALLEN + 1) {
  282                                 printf(
  283                                 "WARNING: too long kenv string, ignoring %s\n",
  284                                     cp);
  285                                 continue;
  286                         }
  287                         if (i < KENV_SIZE) {
  288                                 kenvp[i] = malloc(len, M_KENV, M_WAITOK);
  289                                 strcpy(kenvp[i++], cp);
  290                                 memset(cp, 0, strlen(cp));
  291                         } else
  292                                 printf(
  293                                 "WARNING: too many kenv strings, ignoring %s\n",
  294                                     cp);
  295                 }
  296         }
  297         kenvp[i] = NULL;
  298 
  299         mtx_init(&kenv_lock, "kernel environment", NULL, MTX_DEF);
  300         dynamic_kenv = 1;
  301 }
  302 SYSINIT(kenv, SI_SUB_KMEM, SI_ORDER_ANY, init_dynamic_kenv, NULL);
  303 
  304 void
  305 freeenv(char *env)
  306 {
  307 
  308         if (dynamic_kenv && env != NULL) {
  309                 memset(env, 0, strlen(env));
  310                 free(env, M_KENV);
  311         }
  312 }
  313 
  314 /*
  315  * Internal functions for string lookup.
  316  */
  317 static char *
  318 _getenv_dynamic(const char *name, int *idx)
  319 {
  320         char *cp;
  321         int len, i;
  322 
  323         mtx_assert(&kenv_lock, MA_OWNED);
  324         len = strlen(name);
  325         for (cp = kenvp[0], i = 0; cp != NULL; cp = kenvp[++i]) {
  326                 if ((strncmp(cp, name, len) == 0) &&
  327                     (cp[len] == '=')) {
  328                         if (idx != NULL)
  329                                 *idx = i;
  330                         return (cp + len + 1);
  331                 }
  332         }
  333         return (NULL);
  334 }
  335 
  336 static char *
  337 _getenv_static(const char *name)
  338 {
  339         char *cp, *ep;
  340         int len;
  341 
  342         for (cp = kern_envp; cp != NULL; cp = kernenv_next(cp)) {
  343                 for (ep = cp; (*ep != '=') && (*ep != 0); ep++)
  344                         ;
  345                 if (*ep != '=')
  346                         continue;
  347                 len = ep - cp;
  348                 ep++;
  349                 if (!strncmp(name, cp, len) && name[len] == 0)
  350                         return (ep);
  351         }
  352         return (NULL);
  353 }
  354 
  355 /*
  356  * Look up an environment variable by name.
  357  * Return a pointer to the string if found.
  358  * The pointer has to be freed with freeenv()
  359  * after use.
  360  */
  361 char *
  362 kern_getenv(const char *name)
  363 {
  364         char buf[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1];
  365         char *ret;
  366 
  367         if (dynamic_kenv) {
  368                 if (getenv_string(name, buf, sizeof(buf))) {
  369                         ret = strdup(buf, M_KENV);
  370                 } else {
  371                         ret = NULL;
  372                         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
  373                             "getenv");
  374                 }
  375         } else
  376                 ret = _getenv_static(name);
  377         return (ret);
  378 }
  379 
  380 /*
  381  * Test if an environment variable is defined.
  382  */
  383 int
  384 testenv(const char *name)
  385 {
  386         char *cp;
  387 
  388         if (dynamic_kenv) {
  389                 mtx_lock(&kenv_lock);
  390                 cp = _getenv_dynamic(name, NULL);
  391                 mtx_unlock(&kenv_lock);
  392         } else
  393                 cp = _getenv_static(name);
  394         if (cp != NULL)
  395                 return (1);
  396         return (0);
  397 }
  398 
  399 static int
  400 setenv_static(const char *name, const char *value)
  401 {
  402         int len;
  403 
  404         if (env_pos >= env_len)
  405                 return (-1);
  406 
  407         /* Check space for x=y and two nuls */
  408         len = strlen(name) + strlen(value);
  409         if (len + 3 < env_len - env_pos) {
  410                 len = sprintf(&kern_envp[env_pos], "%s=%s", name, value);
  411                 env_pos += len+1;
  412                 kern_envp[env_pos] = '\0';
  413                 return (0);
  414         } else
  415                 return (-1);
  416 
  417 }
  418 
  419 /*
  420  * Set an environment variable by name.
  421  */
  422 int
  423 kern_setenv(const char *name, const char *value)
  424 {
  425         char *buf, *cp, *oldenv;
  426         int namelen, vallen, i;
  427 
  428         if (dynamic_kenv == 0 && env_len > 0)
  429                 return (setenv_static(name, value));
  430 
  431         KENV_CHECK;
  432 
  433         namelen = strlen(name) + 1;
  434         if (namelen > KENV_MNAMELEN + 1)
  435                 return (-1);
  436         vallen = strlen(value) + 1;
  437         if (vallen > KENV_MVALLEN + 1)
  438                 return (-1);
  439         buf = malloc(namelen + vallen, M_KENV, M_WAITOK);
  440         sprintf(buf, "%s=%s", name, value);
  441 
  442         mtx_lock(&kenv_lock);
  443         cp = _getenv_dynamic(name, &i);
  444         if (cp != NULL) {
  445                 oldenv = kenvp[i];
  446                 kenvp[i] = buf;
  447                 mtx_unlock(&kenv_lock);
  448                 free(oldenv, M_KENV);
  449         } else {
  450                 /* We add the option if it wasn't found */
  451                 for (i = 0; (cp = kenvp[i]) != NULL; i++)
  452                         ;
  453 
  454                 /* Bounds checking */
  455                 if (i < 0 || i >= KENV_SIZE) {
  456                         free(buf, M_KENV);
  457                         mtx_unlock(&kenv_lock);
  458                         return (-1);
  459                 }
  460 
  461                 kenvp[i] = buf;
  462                 kenvp[i + 1] = NULL;
  463                 mtx_unlock(&kenv_lock);
  464         }
  465         return (0);
  466 }
  467 
  468 /*
  469  * Unset an environment variable string.
  470  */
  471 int
  472 kern_unsetenv(const char *name)
  473 {
  474         char *cp, *oldenv;
  475         int i, j;
  476 
  477         KENV_CHECK;
  478 
  479         mtx_lock(&kenv_lock);
  480         cp = _getenv_dynamic(name, &i);
  481         if (cp != NULL) {
  482                 oldenv = kenvp[i];
  483                 for (j = i + 1; kenvp[j] != NULL; j++)
  484                         kenvp[i++] = kenvp[j];
  485                 kenvp[i] = NULL;
  486                 mtx_unlock(&kenv_lock);
  487                 memset(oldenv, 0, strlen(oldenv));
  488                 free(oldenv, M_KENV);
  489                 return (0);
  490         }
  491         mtx_unlock(&kenv_lock);
  492         return (-1);
  493 }
  494 
  495 /*
  496  * Return a string value from an environment variable.
  497  */
  498 int
  499 getenv_string(const char *name, char *data, int size)
  500 {
  501         char *cp;
  502 
  503         if (dynamic_kenv) {
  504                 mtx_lock(&kenv_lock);
  505                 cp = _getenv_dynamic(name, NULL);
  506                 if (cp != NULL)
  507                         strlcpy(data, cp, size);
  508                 mtx_unlock(&kenv_lock);
  509         } else {
  510                 cp = _getenv_static(name);
  511                 if (cp != NULL)
  512                         strlcpy(data, cp, size);
  513         }
  514         return (cp != NULL);
  515 }
  516 
  517 /*
  518  * Return an integer value from an environment variable.
  519  */
  520 int
  521 getenv_int(const char *name, int *data)
  522 {
  523         quad_t tmp;
  524         int rval;
  525 
  526         rval = getenv_quad(name, &tmp);
  527         if (rval)
  528                 *data = (int) tmp;
  529         return (rval);
  530 }
  531 
  532 /*
  533  * Return an unsigned integer value from an environment variable.
  534  */
  535 int
  536 getenv_uint(const char *name, unsigned int *data)
  537 {
  538         quad_t tmp;
  539         int rval;
  540 
  541         rval = getenv_quad(name, &tmp);
  542         if (rval)
  543                 *data = (unsigned int) tmp;
  544         return (rval);
  545 }
  546 
  547 /*
  548  * Return an int64_t value from an environment variable.
  549  */
  550 int
  551 getenv_int64(const char *name, int64_t *data)
  552 {
  553         quad_t tmp;
  554         int64_t rval;
  555 
  556         rval = getenv_quad(name, &tmp);
  557         if (rval)
  558                 *data = (int64_t) tmp;
  559         return (rval);
  560 }
  561 
  562 /*
  563  * Return an uint64_t value from an environment variable.
  564  */
  565 int
  566 getenv_uint64(const char *name, uint64_t *data)
  567 {
  568         quad_t tmp;
  569         uint64_t rval;
  570 
  571         rval = getenv_quad(name, &tmp);
  572         if (rval)
  573                 *data = (uint64_t) tmp;
  574         return (rval);
  575 }
  576 
  577 /*
  578  * Return a long value from an environment variable.
  579  */
  580 int
  581 getenv_long(const char *name, long *data)
  582 {
  583         quad_t tmp;
  584         int rval;
  585 
  586         rval = getenv_quad(name, &tmp);
  587         if (rval)
  588                 *data = (long) tmp;
  589         return (rval);
  590 }
  591 
  592 /*
  593  * Return an unsigned long value from an environment variable.
  594  */
  595 int
  596 getenv_ulong(const char *name, unsigned long *data)
  597 {
  598         quad_t tmp;
  599         int rval;
  600 
  601         rval = getenv_quad(name, &tmp);
  602         if (rval)
  603                 *data = (unsigned long) tmp;
  604         return (rval);
  605 }
  606 
  607 /*
  608  * Return a quad_t value from an environment variable.
  609  */
  610 int
  611 getenv_quad(const char *name, quad_t *data)
  612 {
  613         char    value[KENV_MNAMELEN + 1 + KENV_MVALLEN + 1];
  614         char    *vtp;
  615         quad_t  iv;
  616 
  617         if (!getenv_string(name, value, sizeof(value)))
  618                 return (0);
  619         iv = strtoq(value, &vtp, 0);
  620         if (vtp == value || (vtp[0] != '\0' && vtp[1] != '\0'))
  621                 return (0);
  622         switch (vtp[0]) {
  623         case 't': case 'T':
  624                 iv *= 1024;
  625         case 'g': case 'G':
  626                 iv *= 1024;
  627         case 'm': case 'M':
  628                 iv *= 1024;
  629         case 'k': case 'K':
  630                 iv *= 1024;
  631         case '\0':
  632                 break;
  633         default:
  634                 return (0);
  635         }
  636         *data = iv;
  637         return (1);
  638 }
  639 
  640 /*
  641  * Find the next entry after the one which (cp) falls within, return a
  642  * pointer to its start or NULL if there are no more.
  643  */
  644 static char *
  645 kernenv_next(char *cp)
  646 {
  647 
  648         if (cp != NULL) {
  649                 while (*cp != 0)
  650                         cp++;
  651                 cp++;
  652                 if (*cp == 0)
  653                         cp = NULL;
  654         }
  655         return (cp);
  656 }
  657 
  658 void
  659 tunable_int_init(void *data)
  660 {
  661         struct tunable_int *d = (struct tunable_int *)data;
  662 
  663         TUNABLE_INT_FETCH(d->path, d->var);
  664 }
  665 
  666 void
  667 tunable_long_init(void *data)
  668 {
  669         struct tunable_long *d = (struct tunable_long *)data;
  670 
  671         TUNABLE_LONG_FETCH(d->path, d->var);
  672 }
  673 
  674 void
  675 tunable_ulong_init(void *data)
  676 {
  677         struct tunable_ulong *d = (struct tunable_ulong *)data;
  678 
  679         TUNABLE_ULONG_FETCH(d->path, d->var);
  680 }
  681 
  682 void
  683 tunable_int64_init(void *data)
  684 {
  685         struct tunable_int64 *d = (struct tunable_int64 *)data;
  686 
  687         TUNABLE_INT64_FETCH(d->path, d->var);
  688 }
  689 
  690 void
  691 tunable_uint64_init(void *data)
  692 {
  693         struct tunable_uint64 *d = (struct tunable_uint64 *)data;
  694 
  695         TUNABLE_UINT64_FETCH(d->path, d->var);
  696 }
  697 
  698 void
  699 tunable_quad_init(void *data)
  700 {
  701         struct tunable_quad *d = (struct tunable_quad *)data;
  702 
  703         TUNABLE_QUAD_FETCH(d->path, d->var);
  704 }
  705 
  706 void
  707 tunable_str_init(void *data)
  708 {
  709         struct tunable_str *d = (struct tunable_str *)data;
  710 
  711         TUNABLE_STR_FETCH(d->path, d->var, d->size);
  712 }

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