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_uid16.c

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    1 /*-
    2  * Copyright (c) 2001  The FreeBSD Project
    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 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.2/sys/compat/linux/linux_uid16.c 283427 2015-05-24 16:14:41Z dchagin $");
   29 
   30 #include "opt_compat.h"
   31 
   32 #include <sys/fcntl.h>
   33 #include <sys/param.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mutex.h>
   38 #include <sys/priv.h>
   39 #include <sys/proc.h>
   40 #include <sys/sdt.h>
   41 #include <sys/syscallsubr.h>
   42 #include <sys/sysproto.h>
   43 #include <sys/systm.h>
   44 
   45 #ifdef COMPAT_LINUX32
   46 #include <machine/../linux32/linux.h>
   47 #include <machine/../linux32/linux32_proto.h>
   48 #else
   49 #include <machine/../linux/linux.h>
   50 #include <machine/../linux/linux_proto.h>
   51 #endif
   52 
   53 #include <compat/linux/linux_dtrace.h>
   54 #include <compat/linux/linux_util.h>
   55 
   56 /* DTrace init */
   57 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
   58 
   59 /**
   60  * DTrace probes in this module.
   61  */
   62 LIN_SDT_PROBE_DEFINE3(uid16, linux_chown16, entry, "char *", "l_uid16_t",
   63     "l_gid16_t");
   64 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *");
   65 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, return, "int");
   66 LIN_SDT_PROBE_DEFINE3(uid16, linux_lchown16, entry, "char *", "l_uid16_t",
   67     "l_gid16_t");
   68 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *");
   69 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, return, "int");
   70 LIN_SDT_PROBE_DEFINE2(uid16, linux_setgroups16, entry, "l_uint", "l_gid16_t *");
   71 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int");
   72 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int");
   73 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, return, "int");
   74 LIN_SDT_PROBE_DEFINE2(uid16, linux_getgroups16, entry, "l_uint", "l_gid16_t *");
   75 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int");
   76 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, return, "int");
   77 LIN_SDT_PROBE_DEFINE0(uid16, linux_getgid16, entry);
   78 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgid16, return, "int");
   79 LIN_SDT_PROBE_DEFINE0(uid16, linux_getuid16, entry);
   80 LIN_SDT_PROBE_DEFINE1(uid16, linux_getuid16, return, "int");
   81 LIN_SDT_PROBE_DEFINE0(uid16, linux_getegid16, entry);
   82 LIN_SDT_PROBE_DEFINE1(uid16, linux_getegid16, return, "int");
   83 LIN_SDT_PROBE_DEFINE0(uid16, linux_geteuid16, entry);
   84 LIN_SDT_PROBE_DEFINE1(uid16, linux_geteuid16, return, "int");
   85 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, entry, "l_gid16_t");
   86 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, return, "int");
   87 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, entry, "l_uid16_t");
   88 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, return, "int");
   89 LIN_SDT_PROBE_DEFINE2(uid16, linux_setregid16, entry, "l_gid16_t", "l_gid16_t");
   90 LIN_SDT_PROBE_DEFINE1(uid16, linux_setregid16, return, "int");
   91 LIN_SDT_PROBE_DEFINE2(uid16, linux_setreuid16, entry, "l_uid16_t", "l_uid16_t");
   92 LIN_SDT_PROBE_DEFINE1(uid16, linux_setreuid16, return, "int");
   93 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresgid16, entry, "l_gid16_t", "l_gid16_t",
   94     "l_gid16_t");
   95 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresgid16, return, "int");
   96 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresuid16, entry, "l_uid16_t", "l_uid16_t",
   97     "l_uid16_t");
   98 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresuid16, return, "int");
   99 
  100 DUMMY(setfsuid16);
  101 DUMMY(setfsgid16);
  102 DUMMY(getresuid16);
  103 DUMMY(getresgid16);
  104 
  105 #define CAST_NOCHG(x)   ((x == 0xFFFF) ? -1 : x)
  106 
  107 int
  108 linux_chown16(struct thread *td, struct linux_chown16_args *args)
  109 {
  110         char *path;
  111         int error;
  112 
  113         LCONVPATHEXIST(td, args->path, &path);
  114 
  115         /*
  116          * The DTrace probes have to be after the LCONVPATHEXIST, as
  117          * LCONVPATHEXIST may return on its own and we do not want to
  118          * have a stray entry without the corresponding return.
  119          */
  120         LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid,
  121             args->gid);
  122         LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
  123 
  124         error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
  125             CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
  126         LFREEPATH(path);
  127 
  128         LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
  129         return (error);
  130 }
  131 
  132 int
  133 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
  134 {
  135         char *path;
  136         int error;
  137 
  138         LCONVPATHEXIST(td, args->path, &path);
  139 
  140         /*
  141          * The DTrace probes have to be after the LCONVPATHEXIST, as
  142          * LCONVPATHEXIST may return on its own and we do not want to
  143          * have a stray entry without the corresponding return.
  144          */
  145         LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid,
  146             args->gid);
  147         LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
  148 
  149         error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
  150             CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
  151         LFREEPATH(path);
  152 
  153         LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
  154         return (error);
  155 }
  156 
  157 int
  158 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
  159 {
  160         struct ucred *newcred, *oldcred;
  161         l_gid16_t *linux_gidset;
  162         gid_t *bsd_gidset;
  163         int ngrp, error;
  164         struct proc *p;
  165 
  166         LIN_SDT_PROBE2(uid16, linux_setgroups16, entry, args->gidsetsize,
  167             args->gidset);
  168 
  169         ngrp = args->gidsetsize;
  170         if (ngrp < 0 || ngrp >= ngroups_max + 1) {
  171                 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, EINVAL);
  172                 return (EINVAL);
  173         }
  174         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
  175         error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
  176         if (error) {
  177                 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error);
  178                 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
  179                 free(linux_gidset, M_LINUX);
  180                 return (error);
  181         }
  182         newcred = crget();
  183         p = td->td_proc;
  184         PROC_LOCK(p);
  185         oldcred = crcopysafe(p, newcred);
  186 
  187         /*
  188          * cr_groups[0] holds egid. Setting the whole set from
  189          * the supplied set will cause egid to be changed too.
  190          * Keep cr_groups[0] unchanged to prevent that.
  191          */
  192 
  193         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
  194                 PROC_UNLOCK(p);
  195                 crfree(newcred);
  196 
  197                 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error,
  198                     error);
  199                 goto out;
  200         }
  201 
  202         if (ngrp > 0) {
  203                 newcred->cr_ngroups = ngrp + 1;
  204 
  205                 bsd_gidset = newcred->cr_groups;
  206                 ngrp--;
  207                 while (ngrp >= 0) {
  208                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
  209                         ngrp--;
  210                 }
  211         }
  212         else
  213                 newcred->cr_ngroups = 1;
  214 
  215         setsugid(td->td_proc);
  216         proc_set_cred(p, newcred);
  217         PROC_UNLOCK(p);
  218         crfree(oldcred);
  219         error = 0;
  220 out:
  221         free(linux_gidset, M_LINUX);
  222 
  223         LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
  224         return (error);
  225 }
  226 
  227 int
  228 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
  229 {
  230         struct ucred *cred;
  231         l_gid16_t *linux_gidset;
  232         gid_t *bsd_gidset;
  233         int bsd_gidsetsz, ngrp, error;
  234 
  235         LIN_SDT_PROBE2(uid16, linux_getgroups16, entry, args->gidsetsize,
  236             args->gidset);
  237 
  238         cred = td->td_ucred;
  239         bsd_gidset = cred->cr_groups;
  240         bsd_gidsetsz = cred->cr_ngroups - 1;
  241 
  242         /*
  243          * cr_groups[0] holds egid. Returning the whole set
  244          * here will cause a duplicate. Exclude cr_groups[0]
  245          * to prevent that.
  246          */
  247 
  248         if ((ngrp = args->gidsetsize) == 0) {
  249                 td->td_retval[0] = bsd_gidsetsz;
  250 
  251                 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
  252                 return (0);
  253         }
  254 
  255         if (ngrp < bsd_gidsetsz) {
  256                 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, EINVAL);
  257                 return (EINVAL);
  258         }
  259 
  260         ngrp = 0;
  261         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
  262             M_LINUX, M_WAITOK);
  263         while (ngrp < bsd_gidsetsz) {
  264                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
  265                 ngrp++;
  266         }
  267 
  268         error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
  269         free(linux_gidset, M_LINUX);
  270         if (error) {
  271                 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error);
  272                 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, error);
  273                 return (error);
  274         }
  275 
  276         td->td_retval[0] = ngrp;
  277 
  278         LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
  279         return (0);
  280 }
  281 
  282 /*
  283  * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
  284  * when COMPAT_43 is defined. This clobbers registers that are assumed to
  285  * be preserved. The following lightweight syscalls fixes this. See also
  286  * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c
  287  *
  288  * linux_getgid16() - MP SAFE
  289  * linux_getuid16() - MP SAFE
  290  */
  291 
  292 int
  293 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
  294 {
  295 
  296         LIN_SDT_PROBE0(uid16, linux_getgid16, entry);
  297 
  298         td->td_retval[0] = td->td_ucred->cr_rgid;
  299 
  300         LIN_SDT_PROBE1(uid16, linux_getgid16, return, 0);
  301         return (0);
  302 }
  303 
  304 int
  305 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
  306 {
  307 
  308         LIN_SDT_PROBE0(uid16, linux_getuid16, entry);
  309 
  310         td->td_retval[0] = td->td_ucred->cr_ruid;
  311 
  312         LIN_SDT_PROBE1(uid16, linux_getuid16, return, 0);
  313         return (0);
  314 }
  315 
  316 int
  317 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
  318 {
  319         struct getegid_args bsd;
  320         int error;
  321 
  322         LIN_SDT_PROBE0(uid16, linux_getegid16, entry);
  323 
  324         error = sys_getegid(td, &bsd);
  325 
  326         LIN_SDT_PROBE1(uid16, linux_getegid16, return, error);
  327         return (error);
  328 }
  329 
  330 int
  331 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
  332 {
  333         struct geteuid_args bsd;
  334         int error;
  335 
  336         LIN_SDT_PROBE0(uid16, linux_geteuid16, entry);
  337 
  338         error = sys_geteuid(td, &bsd);
  339 
  340         LIN_SDT_PROBE1(uid16, linux_geteuid16, return, error);
  341         return (error);
  342 }
  343 
  344 int
  345 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
  346 {
  347         struct setgid_args bsd;
  348         int error;
  349 
  350         LIN_SDT_PROBE1(uid16, linux_setgid16, entry, args->gid);
  351 
  352         bsd.gid = args->gid;
  353         error = sys_setgid(td, &bsd);
  354 
  355         LIN_SDT_PROBE1(uid16, linux_setgid16, return, error);
  356         return (error);
  357 }
  358 
  359 int
  360 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
  361 {
  362         struct setuid_args bsd;
  363         int error;
  364 
  365         LIN_SDT_PROBE1(uid16, linux_setuid16, entry, args->uid);
  366 
  367         bsd.uid = args->uid;
  368         error = sys_setuid(td, &bsd);
  369 
  370         LIN_SDT_PROBE1(uid16, linux_setuid16, return, error);
  371         return (error);
  372 }
  373 
  374 int
  375 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
  376 {
  377         struct setregid_args bsd;
  378         int error;
  379 
  380         LIN_SDT_PROBE2(uid16, linux_setregid16, entry, args->rgid, args->egid);
  381 
  382         bsd.rgid = CAST_NOCHG(args->rgid);
  383         bsd.egid = CAST_NOCHG(args->egid);
  384         error = sys_setregid(td, &bsd);
  385 
  386         LIN_SDT_PROBE1(uid16, linux_setregid16, return, error);
  387         return (error);
  388 }
  389 
  390 int
  391 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
  392 {
  393         struct setreuid_args bsd;
  394         int error;
  395 
  396         LIN_SDT_PROBE2(uid16, linux_setreuid16, entry, args->ruid, args->euid);
  397 
  398         bsd.ruid = CAST_NOCHG(args->ruid);
  399         bsd.euid = CAST_NOCHG(args->euid);
  400         error = sys_setreuid(td, &bsd);
  401 
  402         LIN_SDT_PROBE1(uid16, linux_setreuid16, return, error);
  403         return (error);
  404 }
  405 
  406 int
  407 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
  408 {
  409         struct setresgid_args bsd;
  410         int error;
  411 
  412         LIN_SDT_PROBE3(uid16, linux_setresgid16, entry, args->rgid, args->egid,
  413             args->sgid);
  414 
  415         bsd.rgid = CAST_NOCHG(args->rgid);
  416         bsd.egid = CAST_NOCHG(args->egid);
  417         bsd.sgid = CAST_NOCHG(args->sgid);
  418         error = sys_setresgid(td, &bsd);
  419 
  420         LIN_SDT_PROBE1(uid16, linux_setresgid16, return, error);
  421         return (error);
  422 }
  423 
  424 int
  425 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
  426 {
  427         struct setresuid_args bsd;
  428         int error;
  429 
  430         LIN_SDT_PROBE3(uid16, linux_setresuid16, entry, args->ruid, args->euid,
  431             args->suid);
  432 
  433         bsd.ruid = CAST_NOCHG(args->ruid);
  434         bsd.euid = CAST_NOCHG(args->euid);
  435         bsd.suid = CAST_NOCHG(args->suid);
  436         error = sys_setresuid(td, &bsd);
  437 
  438         LIN_SDT_PROBE1(uid16, linux_setresuid16, return, error);
  439         return (error);
  440 }

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