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/5.2/sys/compat/linux/linux_uid16.c 121302 2003-10-21 11:00:33Z tjr $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/lock.h>
   32 #include <sys/malloc.h>
   33 #include <sys/mutex.h>
   34 #include <sys/proc.h>
   35 #include <sys/syscallsubr.h>
   36 #include <sys/sysproto.h>
   37 #include <sys/systm.h>
   38 
   39 #include <machine/../linux/linux.h>
   40 #include <machine/../linux/linux_proto.h>
   41 
   42 #include <compat/linux/linux_util.h>
   43 
   44 DUMMY(setfsuid16);
   45 DUMMY(setfsgid16);
   46 DUMMY(getresuid16);
   47 DUMMY(getresgid16);
   48 
   49 #define CAST_NOCHG(x)   ((x == 0xFFFF) ? -1 : x)
   50 
   51 int
   52 linux_chown16(struct thread *td, struct linux_chown16_args *args)
   53 {
   54         char *path;
   55         int error;
   56 
   57         LCONVPATHEXIST(td, args->path, &path);
   58 
   59 #ifdef DEBUG
   60         if (ldebug(chown16))
   61                 printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid);
   62 #endif
   63         error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
   64             CAST_NOCHG(args->gid));
   65         LFREEPATH(path);
   66         return (error);
   67 }
   68 
   69 int
   70 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
   71 {
   72         char *path;
   73         int error;
   74 
   75         LCONVPATHEXIST(td, args->path, &path);
   76 
   77 #ifdef DEBUG
   78         if (ldebug(lchown16))
   79                 printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
   80                     args->gid);
   81 #endif
   82         error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
   83             CAST_NOCHG(args->gid));
   84         LFREEPATH(path);
   85         return (error);
   86 }
   87 
   88 int
   89 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
   90 {
   91         struct ucred *newcred, *oldcred;
   92         l_gid16_t linux_gidset[NGROUPS];
   93         gid_t *bsd_gidset;
   94         int ngrp, error;
   95         struct proc *p;
   96 
   97 #ifdef DEBUG
   98         if (ldebug(setgroups16))
   99                 printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
  100 #endif
  101 
  102         ngrp = args->gidsetsize;
  103         if (ngrp < 0 || ngrp >= NGROUPS)
  104                 return (EINVAL);
  105         error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
  106         if (error)
  107                 return (error);
  108         newcred = crget();
  109         p = td->td_proc;
  110         PROC_LOCK(p);
  111         oldcred = p->p_ucred;
  112 
  113         /*
  114          * cr_groups[0] holds egid. Setting the whole set from
  115          * the supplied set will cause egid to be changed too.
  116          * Keep cr_groups[0] unchanged to prevent that.
  117          */
  118 
  119         if ((error = suser_cred(oldcred, PRISON_ROOT)) != 0) {
  120                 PROC_UNLOCK(p);
  121                 crfree(newcred);
  122                 return (error);
  123         }
  124 
  125         crcopy(newcred, oldcred);
  126         if (ngrp > 0) {
  127                 newcred->cr_ngroups = ngrp + 1;
  128 
  129                 bsd_gidset = newcred->cr_groups;
  130                 ngrp--;
  131                 while (ngrp >= 0) {
  132                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
  133                         ngrp--;
  134                 }
  135         }
  136         else
  137                 newcred->cr_ngroups = 1;
  138 
  139         setsugid(td->td_proc);
  140         p->p_ucred = newcred;
  141         PROC_UNLOCK(p);
  142         crfree(oldcred);
  143         return (0);
  144 }
  145 
  146 int
  147 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
  148 {
  149         struct ucred *cred;
  150         l_gid16_t linux_gidset[NGROUPS];
  151         gid_t *bsd_gidset;
  152         int bsd_gidsetsz, ngrp, error;
  153 
  154 #ifdef DEBUG
  155         if (ldebug(getgroups16))
  156                 printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
  157 #endif
  158 
  159         cred = td->td_ucred;
  160         bsd_gidset = cred->cr_groups;
  161         bsd_gidsetsz = cred->cr_ngroups - 1;
  162 
  163         /*
  164          * cr_groups[0] holds egid. Returning the whole set
  165          * here will cause a duplicate. Exclude cr_groups[0]
  166          * to prevent that.
  167          */
  168 
  169         if ((ngrp = args->gidsetsize) == 0) {
  170                 td->td_retval[0] = bsd_gidsetsz;
  171                 return (0);
  172         }
  173 
  174         if (ngrp < bsd_gidsetsz)
  175                 return (EINVAL);
  176 
  177         ngrp = 0;
  178         while (ngrp < bsd_gidsetsz) {
  179                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
  180                 ngrp++;
  181         }
  182 
  183         error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
  184         if (error)
  185                 return (error);
  186 
  187         td->td_retval[0] = ngrp;
  188         return (0);
  189 }
  190 
  191 /*
  192  * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
  193  * when COMPAT_43 or COMPAT_SUNOS is defined. This globbers registers that
  194  * are assumed to be preserved. The following lightweight syscalls fixes
  195  * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in
  196  * linux_misc.c
  197  *
  198  * linux_getgid16() - MP SAFE
  199  * linux_getuid16() - MP SAFE
  200  */
  201 
  202 int
  203 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
  204 {
  205 
  206         td->td_retval[0] = td->td_ucred->cr_rgid;
  207         return (0);
  208 }
  209 
  210 int
  211 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
  212 {
  213 
  214         td->td_retval[0] = td->td_ucred->cr_ruid;
  215         return (0);
  216 }
  217 
  218 int
  219 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
  220 {
  221         struct getegid_args bsd;
  222 
  223         return (getegid(td, &bsd));
  224 }
  225 
  226 int
  227 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
  228 {
  229         struct geteuid_args bsd;
  230 
  231         return (geteuid(td, &bsd));
  232 }
  233 
  234 int
  235 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
  236 {
  237         struct setgid_args bsd;
  238 
  239         bsd.gid = args->gid;
  240         return (setgid(td, &bsd));
  241 }
  242 
  243 int
  244 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
  245 {
  246         struct setuid_args bsd;
  247 
  248         bsd.uid = args->uid;
  249         return (setuid(td, &bsd));
  250 }
  251 
  252 int
  253 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
  254 {
  255         struct setregid_args bsd;
  256 
  257         bsd.rgid = CAST_NOCHG(args->rgid);
  258         bsd.egid = CAST_NOCHG(args->egid);
  259         return (setregid(td, &bsd));
  260 }
  261 
  262 int
  263 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
  264 {
  265         struct setreuid_args bsd;
  266 
  267         bsd.ruid = CAST_NOCHG(args->ruid);
  268         bsd.euid = CAST_NOCHG(args->euid);
  269         return (setreuid(td, &bsd));
  270 }
  271 
  272 int
  273 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
  274 {
  275         struct setresgid_args bsd;
  276 
  277         bsd.rgid = CAST_NOCHG(args->rgid);
  278         bsd.egid = CAST_NOCHG(args->egid);
  279         bsd.sgid = CAST_NOCHG(args->sgid);
  280         return (setresgid(td, &bsd));
  281 }
  282 
  283 int
  284 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
  285 {
  286         struct setresuid_args bsd;
  287 
  288         bsd.ruid = CAST_NOCHG(args->ruid);
  289         bsd.euid = CAST_NOCHG(args->euid);
  290         bsd.suid = CAST_NOCHG(args->suid);
  291         return (setresuid(td, &bsd));
  292 }

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