The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_mib.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1999 Marcel Moolenaar
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/11.2/sys/compat/linux/linux_mib.c 330997 2018-03-15 12:56:22Z emaste $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/sdt.h>
   35 #include <sys/systm.h>
   36 #include <sys/sysctl.h>
   37 #include <sys/proc.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mount.h>
   40 #include <sys/jail.h>
   41 #include <sys/lock.h>
   42 #include <sys/sx.h>
   43 
   44 #include <compat/linux/linux_mib.h>
   45 #include <compat/linux/linux_misc.h>
   46 
   47 struct linux_prison {
   48         char    pr_osname[LINUX_MAX_UTSNAME];
   49         char    pr_osrelease[LINUX_MAX_UTSNAME];
   50         int     pr_oss_version;
   51         int     pr_osrel;
   52 };
   53 
   54 static struct linux_prison lprison0 = {
   55         .pr_osname =            "Linux",
   56         .pr_osrelease =         LINUX_VERSION_STR,
   57         .pr_oss_version =       0x030600,
   58         .pr_osrel =             LINUX_VERSION_CODE
   59 };
   60 
   61 static unsigned linux_osd_jail_slot;
   62 
   63 SYSCTL_NODE(_compat, OID_AUTO, linux, CTLFLAG_RW, 0, "Linux mode");
   64 
   65 static int      linux_set_osname(struct thread *td, char *osname);
   66 static int      linux_set_osrelease(struct thread *td, char *osrelease);
   67 static int      linux_set_oss_version(struct thread *td, int oss_version);
   68 
   69 static int
   70 linux_sysctl_osname(SYSCTL_HANDLER_ARGS)
   71 {
   72         char osname[LINUX_MAX_UTSNAME];
   73         int error;
   74 
   75         linux_get_osname(req->td, osname);
   76         error = sysctl_handle_string(oidp, osname, LINUX_MAX_UTSNAME, req);
   77         if (error != 0 || req->newptr == NULL)
   78                 return (error);
   79         error = linux_set_osname(req->td, osname);
   80 
   81         return (error);
   82 }
   83 
   84 SYSCTL_PROC(_compat_linux, OID_AUTO, osname,
   85             CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
   86             0, 0, linux_sysctl_osname, "A",
   87             "Linux kernel OS name");
   88 
   89 static int
   90 linux_sysctl_osrelease(SYSCTL_HANDLER_ARGS)
   91 {
   92         char osrelease[LINUX_MAX_UTSNAME];
   93         int error;
   94 
   95         linux_get_osrelease(req->td, osrelease);
   96         error = sysctl_handle_string(oidp, osrelease, LINUX_MAX_UTSNAME, req);
   97         if (error != 0 || req->newptr == NULL)
   98                 return (error);
   99         error = linux_set_osrelease(req->td, osrelease);
  100 
  101         return (error);
  102 }
  103 
  104 SYSCTL_PROC(_compat_linux, OID_AUTO, osrelease,
  105             CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
  106             0, 0, linux_sysctl_osrelease, "A",
  107             "Linux kernel OS release");
  108 
  109 static int
  110 linux_sysctl_oss_version(SYSCTL_HANDLER_ARGS)
  111 {
  112         int oss_version;
  113         int error;
  114 
  115         oss_version = linux_get_oss_version(req->td);
  116         error = sysctl_handle_int(oidp, &oss_version, 0, req);
  117         if (error != 0 || req->newptr == NULL)
  118                 return (error);
  119         error = linux_set_oss_version(req->td, oss_version);
  120 
  121         return (error);
  122 }
  123 
  124 SYSCTL_PROC(_compat_linux, OID_AUTO, oss_version,
  125             CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
  126             0, 0, linux_sysctl_oss_version, "I",
  127             "Linux OSS version");
  128 
  129 /*
  130  * Map the osrelease into integer
  131  */
  132 static int
  133 linux_map_osrel(char *osrelease, int *osrel)
  134 {
  135         char *sep, *eosrelease;
  136         int len, v0, v1, v2, v;
  137 
  138         len = strlen(osrelease);
  139         eosrelease = osrelease + len;
  140         v0 = strtol(osrelease, &sep, 10);
  141         if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
  142                 return (EINVAL);
  143         osrelease = sep + 1;
  144         v1 = strtol(osrelease, &sep, 10);
  145         if (osrelease == sep || sep + 1 >= eosrelease || *sep != '.')
  146                 return (EINVAL);
  147         osrelease = sep + 1;
  148         v2 = strtol(osrelease, &sep, 10);
  149         if (osrelease == sep || sep != eosrelease)
  150                 return (EINVAL);
  151 
  152         v = v0 * 1000000 + v1 * 1000 + v2;
  153         if (v < 1000000)
  154                 return (EINVAL);
  155 
  156         if (osrel != NULL)
  157                 *osrel = v;
  158 
  159         return (0);
  160 }
  161 
  162 /*
  163  * Find a prison with Linux info.
  164  * Return the Linux info and the (locked) prison.
  165  */
  166 static struct linux_prison *
  167 linux_find_prison(struct prison *spr, struct prison **prp)
  168 {
  169         struct prison *pr;
  170         struct linux_prison *lpr;
  171 
  172         for (pr = spr;; pr = pr->pr_parent) {
  173                 mtx_lock(&pr->pr_mtx);
  174                 lpr = (pr == &prison0)
  175                     ? &lprison0
  176                     : osd_jail_get(pr, linux_osd_jail_slot);
  177                 if (lpr != NULL)
  178                         break;
  179                 mtx_unlock(&pr->pr_mtx);
  180         }
  181         *prp = pr;
  182 
  183         return (lpr);
  184 }
  185 
  186 /*
  187  * Ensure a prison has its own Linux info.  If lprp is non-null, point it to
  188  * the Linux info and lock the prison.
  189  */
  190 static void
  191 linux_alloc_prison(struct prison *pr, struct linux_prison **lprp)
  192 {
  193         struct prison *ppr;
  194         struct linux_prison *lpr, *nlpr;
  195         void **rsv;
  196 
  197         /* If this prison already has Linux info, return that. */
  198         lpr = linux_find_prison(pr, &ppr);
  199         if (ppr == pr)
  200                 goto done;
  201         /*
  202          * Allocate a new info record.  Then check again, in case something
  203          * changed during the allocation.
  204          */
  205         mtx_unlock(&ppr->pr_mtx);
  206         nlpr = malloc(sizeof(struct linux_prison), M_PRISON, M_WAITOK);
  207         rsv = osd_reserve(linux_osd_jail_slot);
  208         lpr = linux_find_prison(pr, &ppr);
  209         if (ppr == pr) {
  210                 free(nlpr, M_PRISON);
  211                 osd_free_reserved(rsv);
  212                 goto done;
  213         }
  214         /* Inherit the initial values from the ancestor. */
  215         mtx_lock(&pr->pr_mtx);
  216         (void)osd_jail_set_reserved(pr, linux_osd_jail_slot, rsv, nlpr);
  217         bcopy(lpr, nlpr, sizeof(*lpr));
  218         lpr = nlpr;
  219         mtx_unlock(&ppr->pr_mtx);
  220  done:
  221         if (lprp != NULL)
  222                 *lprp = lpr;
  223         else
  224                 mtx_unlock(&pr->pr_mtx);
  225 }
  226 
  227 /*
  228  * Jail OSD methods for Linux prison data.
  229  */
  230 static int
  231 linux_prison_create(void *obj, void *data)
  232 {
  233         struct prison *pr = obj;
  234         struct vfsoptlist *opts = data;
  235         int jsys;
  236 
  237         if (vfs_copyopt(opts, "linux", &jsys, sizeof(jsys)) == 0 &&
  238             jsys == JAIL_SYS_INHERIT)
  239                 return (0);
  240         /*
  241          * Inherit a prison's initial values from its parent
  242          * (different from JAIL_SYS_INHERIT which also inherits changes).
  243          */
  244         linux_alloc_prison(pr, NULL);
  245         return (0);
  246 }
  247 
  248 static int
  249 linux_prison_check(void *obj __unused, void *data)
  250 {
  251         struct vfsoptlist *opts = data;
  252         char *osname, *osrelease;
  253         int error, jsys, len, oss_version;
  254 
  255         /* Check that the parameters are correct. */
  256         error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
  257         if (error != ENOENT) {
  258                 if (error != 0)
  259                         return (error);
  260                 if (jsys != JAIL_SYS_NEW && jsys != JAIL_SYS_INHERIT)
  261                         return (EINVAL);
  262         }
  263         error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
  264         if (error != ENOENT) {
  265                 if (error != 0)
  266                         return (error);
  267                 if (len == 0 || osname[len - 1] != '\0')
  268                         return (EINVAL);
  269                 if (len > LINUX_MAX_UTSNAME) {
  270                         vfs_opterror(opts, "linux.osname too long");
  271                         return (ENAMETOOLONG);
  272                 }
  273         }
  274         error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
  275         if (error != ENOENT) {
  276                 if (error != 0)
  277                         return (error);
  278                 if (len == 0 || osrelease[len - 1] != '\0')
  279                         return (EINVAL);
  280                 if (len > LINUX_MAX_UTSNAME) {
  281                         vfs_opterror(opts, "linux.osrelease too long");
  282                         return (ENAMETOOLONG);
  283                 }
  284                 error = linux_map_osrel(osrelease, NULL);
  285                 if (error != 0) {
  286                         vfs_opterror(opts, "linux.osrelease format error");
  287                         return (error);
  288                 }
  289         }
  290         error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
  291             sizeof(oss_version));
  292 
  293         if (error == ENOENT)
  294                 error = 0;
  295         return (error);
  296 }
  297 
  298 static int
  299 linux_prison_set(void *obj, void *data)
  300 {
  301         struct linux_prison *lpr;
  302         struct prison *pr = obj;
  303         struct vfsoptlist *opts = data;
  304         char *osname, *osrelease;
  305         int error, gotversion, jsys, len, oss_version;
  306 
  307         /* Set the parameters, which should be correct. */
  308         error = vfs_copyopt(opts, "linux", &jsys, sizeof(jsys));
  309         if (error == ENOENT)
  310                 jsys = -1;
  311         error = vfs_getopt(opts, "linux.osname", (void **)&osname, &len);
  312         if (error == ENOENT)
  313                 osname = NULL;
  314         else
  315                 jsys = JAIL_SYS_NEW;
  316         error = vfs_getopt(opts, "linux.osrelease", (void **)&osrelease, &len);
  317         if (error == ENOENT)
  318                 osrelease = NULL;
  319         else
  320                 jsys = JAIL_SYS_NEW;
  321         error = vfs_copyopt(opts, "linux.oss_version", &oss_version,
  322             sizeof(oss_version));
  323         if (error == ENOENT)
  324                 gotversion = 0;
  325         else {
  326                 gotversion = 1;
  327                 jsys = JAIL_SYS_NEW;
  328         }
  329         switch (jsys) {
  330         case JAIL_SYS_INHERIT:
  331                 /* "linux=inherit": inherit the parent's Linux info. */
  332                 mtx_lock(&pr->pr_mtx);
  333                 osd_jail_del(pr, linux_osd_jail_slot);
  334                 mtx_unlock(&pr->pr_mtx);
  335                 break;
  336         case JAIL_SYS_NEW:
  337                 /*
  338                  * "linux=new" or "linux.*":
  339                  * the prison gets its own Linux info.
  340                  */
  341                 linux_alloc_prison(pr, &lpr);
  342                 if (osrelease) {
  343                         (void)linux_map_osrel(osrelease, &lpr->pr_osrel);
  344                         strlcpy(lpr->pr_osrelease, osrelease,
  345                             LINUX_MAX_UTSNAME);
  346                 }
  347                 if (osname)
  348                         strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
  349                 if (gotversion)
  350                         lpr->pr_oss_version = oss_version;
  351                 mtx_unlock(&pr->pr_mtx);
  352         }
  353 
  354         return (0);
  355 }
  356 
  357 SYSCTL_JAIL_PARAM_SYS_NODE(linux, CTLFLAG_RW, "Jail Linux parameters");
  358 SYSCTL_JAIL_PARAM_STRING(_linux, osname, CTLFLAG_RW, LINUX_MAX_UTSNAME,
  359     "Jail Linux kernel OS name");
  360 SYSCTL_JAIL_PARAM_STRING(_linux, osrelease, CTLFLAG_RW, LINUX_MAX_UTSNAME,
  361     "Jail Linux kernel OS release");
  362 SYSCTL_JAIL_PARAM(_linux, oss_version, CTLTYPE_INT | CTLFLAG_RW,
  363     "I", "Jail Linux OSS version");
  364 
  365 static int
  366 linux_prison_get(void *obj, void *data)
  367 {
  368         struct linux_prison *lpr;
  369         struct prison *ppr;
  370         struct prison *pr = obj;
  371         struct vfsoptlist *opts = data;
  372         int error, i;
  373 
  374         static int version0;
  375 
  376         /* See if this prison is the one with the Linux info. */
  377         lpr = linux_find_prison(pr, &ppr);
  378         i = (ppr == pr) ? JAIL_SYS_NEW : JAIL_SYS_INHERIT;
  379         error = vfs_setopt(opts, "linux", &i, sizeof(i));
  380         if (error != 0 && error != ENOENT)
  381                 goto done;
  382         if (i) {
  383                 error = vfs_setopts(opts, "linux.osname", lpr->pr_osname);
  384                 if (error != 0 && error != ENOENT)
  385                         goto done;
  386                 error = vfs_setopts(opts, "linux.osrelease", lpr->pr_osrelease);
  387                 if (error != 0 && error != ENOENT)
  388                         goto done;
  389                 error = vfs_setopt(opts, "linux.oss_version",
  390                     &lpr->pr_oss_version, sizeof(lpr->pr_oss_version));
  391                 if (error != 0 && error != ENOENT)
  392                         goto done;
  393         } else {
  394                 /*
  395                  * If this prison is inheriting its Linux info, report
  396                  * empty/zero parameters.
  397                  */
  398                 error = vfs_setopts(opts, "linux.osname", "");
  399                 if (error != 0 && error != ENOENT)
  400                         goto done;
  401                 error = vfs_setopts(opts, "linux.osrelease", "");
  402                 if (error != 0 && error != ENOENT)
  403                         goto done;
  404                 error = vfs_setopt(opts, "linux.oss_version", &version0,
  405                     sizeof(lpr->pr_oss_version));
  406                 if (error != 0 && error != ENOENT)
  407                         goto done;
  408         }
  409         error = 0;
  410 
  411  done:
  412         mtx_unlock(&ppr->pr_mtx);
  413 
  414         return (error);
  415 }
  416 
  417 static void
  418 linux_prison_destructor(void *data)
  419 {
  420 
  421         free(data, M_PRISON);
  422 }
  423 
  424 void
  425 linux_osd_jail_register(void)
  426 {
  427         struct prison *pr;
  428         osd_method_t methods[PR_MAXMETHOD] = {
  429             [PR_METHOD_CREATE] =        linux_prison_create,
  430             [PR_METHOD_GET] =           linux_prison_get,
  431             [PR_METHOD_SET] =           linux_prison_set,
  432             [PR_METHOD_CHECK] =         linux_prison_check
  433         };
  434 
  435         linux_osd_jail_slot =
  436             osd_jail_register(linux_prison_destructor, methods);
  437         /* Copy the system linux info to any current prisons. */
  438         sx_slock(&allprison_lock);
  439         TAILQ_FOREACH(pr, &allprison, pr_list)
  440                 linux_alloc_prison(pr, NULL);
  441         sx_sunlock(&allprison_lock);
  442 }
  443 
  444 void
  445 linux_osd_jail_deregister(void)
  446 {
  447 
  448         osd_jail_deregister(linux_osd_jail_slot);
  449 }
  450 
  451 void
  452 linux_get_osname(struct thread *td, char *dst)
  453 {
  454         struct prison *pr;
  455         struct linux_prison *lpr;
  456 
  457         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  458         bcopy(lpr->pr_osname, dst, LINUX_MAX_UTSNAME);
  459         mtx_unlock(&pr->pr_mtx);
  460 }
  461 
  462 static int
  463 linux_set_osname(struct thread *td, char *osname)
  464 {
  465         struct prison *pr;
  466         struct linux_prison *lpr;
  467 
  468         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  469         strlcpy(lpr->pr_osname, osname, LINUX_MAX_UTSNAME);
  470         mtx_unlock(&pr->pr_mtx);
  471 
  472         return (0);
  473 }
  474 
  475 void
  476 linux_get_osrelease(struct thread *td, char *dst)
  477 {
  478         struct prison *pr;
  479         struct linux_prison *lpr;
  480 
  481         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  482         bcopy(lpr->pr_osrelease, dst, LINUX_MAX_UTSNAME);
  483         mtx_unlock(&pr->pr_mtx);
  484 }
  485 
  486 int
  487 linux_kernver(struct thread *td)
  488 {
  489         struct prison *pr;
  490         struct linux_prison *lpr;
  491         int osrel;
  492 
  493         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  494         osrel = lpr->pr_osrel;
  495         mtx_unlock(&pr->pr_mtx);
  496 
  497         return (osrel);
  498 }
  499 
  500 static int
  501 linux_set_osrelease(struct thread *td, char *osrelease)
  502 {
  503         struct prison *pr;
  504         struct linux_prison *lpr;
  505         int error;
  506 
  507         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  508         error = linux_map_osrel(osrelease, &lpr->pr_osrel);
  509         if (error == 0)
  510                 strlcpy(lpr->pr_osrelease, osrelease, LINUX_MAX_UTSNAME);
  511         mtx_unlock(&pr->pr_mtx);
  512 
  513         return (error);
  514 }
  515 
  516 int
  517 linux_get_oss_version(struct thread *td)
  518 {
  519         struct prison *pr;
  520         struct linux_prison *lpr;
  521         int version;
  522 
  523         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  524         version = lpr->pr_oss_version;
  525         mtx_unlock(&pr->pr_mtx);
  526 
  527         return (version);
  528 }
  529 
  530 static int
  531 linux_set_oss_version(struct thread *td, int oss_version)
  532 {
  533         struct prison *pr;
  534         struct linux_prison *lpr;
  535 
  536         lpr = linux_find_prison(td->td_ucred->cr_prison, &pr);
  537         lpr->pr_oss_version = oss_version;
  538         mtx_unlock(&pr->pr_mtx);
  539 
  540         return (0);
  541 }

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