linux_uid16.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2001  The FreeBSD Project
    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("$FreeBSD$");
   31 
   32 #include "opt_compat.h"
   33 
   34 #include <sys/fcntl.h>
   35 #include <sys/param.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/mutex.h>
   40 #include <sys/priv.h>
   41 #include <sys/proc.h>
   42 #include <sys/sdt.h>
   43 #include <sys/syscallsubr.h>
   44 #include <sys/sysproto.h>
   45 #include <sys/systm.h>
   46 
   47 #ifdef COMPAT_LINUX32
   48 #include <machine/../linux32/linux.h>
   49 #include <machine/../linux32/linux32_proto.h>
   50 #else
   51 #include <machine/../linux/linux.h>
   52 #include <machine/../linux/linux_proto.h>
   53 #endif
   54 
   55 #include <compat/linux/linux_dtrace.h>
   56 #include <compat/linux/linux_util.h>
   57 
   58 /* DTrace init */
   59 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
   60 
   61 /**
   62  * DTrace probes in this module.
   63  */
   64 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *");
   65 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *");
   66 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int");
   67 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int");
   68 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int");
   69 
   70 DUMMY(setfsuid16);
   71 DUMMY(setfsgid16);
   72 DUMMY(getresuid16);
   73 DUMMY(getresgid16);
   74 
   75 #define CAST_NOCHG(x)   ((x == 0xFFFF) ? -1 : x)
   76 
   77 int
   78 linux_chown16(struct thread *td, struct linux_chown16_args *args)
   79 {
   80         char *path;
   81         int error;
   82 
   83         if (!LUSECONVPATH(td) && !SDT_PROBES_ENABLED()) {
   84                 error = kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE,
   85                     CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
   86         } else {
   87                 LCONVPATHEXIST(args->path, &path);
   88                 /*
   89                  * The DTrace probes have to be after the LCONVPATHEXIST, as
   90                  * LCONVPATHEXIST may return on its own and we do not want to
   91                  * have a stray entry without the corresponding return.
   92                  */
   93                 LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
   94 
   95                 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
   96                     CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
   97                 LFREEPATH(path);
   98         }
   99         return (error);
  100 }
  101 
  102 int
  103 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
  104 {
  105         char *path;
  106         int error;
  107 
  108         if (!LUSECONVPATH(td) && !SDT_PROBES_ENABLED()) {
  109                 error = kern_fchownat(td, AT_FDCWD, args->path, UIO_USERSPACE,
  110                     CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
  111         } else {
  112                 LCONVPATHEXIST(args->path, &path);
  113 
  114                 /*
  115                  * The DTrace probes have to be after the LCONVPATHEXIST, as
  116                  * LCONVPATHEXIST may return on its own and we do not want to
  117                  * have a stray entry without the corresponding return.
  118                  */
  119                 LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
  120 
  121                 error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
  122                     CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
  123                 LFREEPATH(path);
  124         }
  125         return (error);
  126 }
  127 
  128 int
  129 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
  130 {
  131         struct ucred *newcred, *oldcred;
  132         l_gid16_t *linux_gidset;
  133         gid_t *bsd_gidset;
  134         int ngrp, error;
  135         struct proc *p;
  136 
  137         ngrp = args->gidsetsize;
  138         if (ngrp < 0 || ngrp >= ngroups_max + 1)
  139                 return (EINVAL);
  140         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
  141         error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
  142         if (error) {
  143                 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error);
  144                 free(linux_gidset, M_LINUX);
  145                 return (error);
  146         }
  147         newcred = crget();
  148         p = td->td_proc;
  149         PROC_LOCK(p);
  150         oldcred = crcopysafe(p, newcred);
  151 
  152         /*
  153          * cr_groups[0] holds egid. Setting the whole set from
  154          * the supplied set will cause egid to be changed too.
  155          * Keep cr_groups[0] unchanged to prevent that.
  156          */
  157 
  158         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS)) != 0) {
  159                 PROC_UNLOCK(p);
  160                 crfree(newcred);
  161 
  162                 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error,
  163                     error);
  164                 goto out;
  165         }
  166 
  167         if (ngrp > 0) {
  168                 newcred->cr_ngroups = ngrp + 1;
  169 
  170                 bsd_gidset = newcred->cr_groups;
  171                 ngrp--;
  172                 while (ngrp >= 0) {
  173                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
  174                         ngrp--;
  175                 }
  176         }
  177         else
  178                 newcred->cr_ngroups = 1;
  179 
  180         setsugid(td->td_proc);
  181         proc_set_cred(p, newcred);
  182         PROC_UNLOCK(p);
  183         crfree(oldcred);
  184         error = 0;
  185 out:
  186         free(linux_gidset, M_LINUX);
  187 
  188         return (error);
  189 }
  190 
  191 int
  192 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
  193 {
  194         struct ucred *cred;
  195         l_gid16_t *linux_gidset;
  196         gid_t *bsd_gidset;
  197         int bsd_gidsetsz, ngrp, error;
  198 
  199         cred = td->td_ucred;
  200         bsd_gidset = cred->cr_groups;
  201         bsd_gidsetsz = cred->cr_ngroups - 1;
  202 
  203         /*
  204          * cr_groups[0] holds egid. Returning the whole set
  205          * here will cause a duplicate. Exclude cr_groups[0]
  206          * to prevent that.
  207          */
  208 
  209         if ((ngrp = args->gidsetsize) == 0) {
  210                 td->td_retval[0] = bsd_gidsetsz;
  211                 return (0);
  212         }
  213 
  214         if (ngrp < bsd_gidsetsz)
  215                 return (EINVAL);
  216 
  217         ngrp = 0;
  218         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
  219             M_LINUX, M_WAITOK);
  220         while (ngrp < bsd_gidsetsz) {
  221                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
  222                 ngrp++;
  223         }
  224 
  225         error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
  226         free(linux_gidset, M_LINUX);
  227         if (error) {
  228                 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error);
  229                 return (error);
  230         }
  231 
  232         td->td_retval[0] = ngrp;
  233 
  234         return (0);
  235 }
  236 
  237 int
  238 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
  239 {
  240 
  241         td->td_retval[0] = td->td_ucred->cr_rgid;
  242 
  243         return (0);
  244 }
  245 
  246 int
  247 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
  248 {
  249 
  250         td->td_retval[0] = td->td_ucred->cr_ruid;
  251 
  252         return (0);
  253 }
  254 
  255 int
  256 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
  257 {
  258         struct getegid_args bsd;
  259         int error;
  260 
  261         error = sys_getegid(td, &bsd);
  262 
  263         return (error);
  264 }
  265 
  266 int
  267 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
  268 {
  269         struct geteuid_args bsd;
  270         int error;
  271 
  272         error = sys_geteuid(td, &bsd);
  273 
  274         return (error);
  275 }
  276 
  277 int
  278 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
  279 {
  280         struct setgid_args bsd;
  281         int error;
  282 
  283         bsd.gid = args->gid;
  284         error = sys_setgid(td, &bsd);
  285 
  286         return (error);
  287 }
  288 
  289 int
  290 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
  291 {
  292         struct setuid_args bsd;
  293         int error;
  294 
  295         bsd.uid = args->uid;
  296         error = sys_setuid(td, &bsd);
  297 
  298         return (error);
  299 }
  300 
  301 int
  302 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
  303 {
  304         struct setregid_args bsd;
  305         int error;
  306 
  307         bsd.rgid = CAST_NOCHG(args->rgid);
  308         bsd.egid = CAST_NOCHG(args->egid);
  309         error = sys_setregid(td, &bsd);
  310 
  311         return (error);
  312 }
  313 
  314 int
  315 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
  316 {
  317         struct setreuid_args bsd;
  318         int error;
  319 
  320         bsd.ruid = CAST_NOCHG(args->ruid);
  321         bsd.euid = CAST_NOCHG(args->euid);
  322         error = sys_setreuid(td, &bsd);
  323 
  324         return (error);
  325 }
  326 
  327 int
  328 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
  329 {
  330         struct setresgid_args bsd;
  331         int error;
  332 
  333         bsd.rgid = CAST_NOCHG(args->rgid);
  334         bsd.egid = CAST_NOCHG(args->egid);
  335         bsd.sgid = CAST_NOCHG(args->sgid);
  336         error = sys_setresgid(td, &bsd);
  337 
  338         return (error);
  339 }
  340 
  341 int
  342 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
  343 {
  344         struct setresuid_args bsd;
  345         int error;
  346 
  347         bsd.ruid = CAST_NOCHG(args->ruid);
  348         bsd.euid = CAST_NOCHG(args->euid);
  349         bsd.suid = CAST_NOCHG(args->suid);
  350         error = sys_setresuid(td, &bsd);
  351 
  352         return (error);
  353 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_uid16.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_uid16.c
