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/emulation/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  * $FreeBSD: src/sys/compat/linux/linux_uid16.c,v 1.4.2.1 2001/10/21 03:57:35 marcel Exp $
   27  */
   28 
   29 #include "opt_compat.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/kern_syscall.h>
   34 #include <sys/nlookup.h>
   35 #include <sys/proc.h>
   36 #include <sys/priv.h>
   37 #include <sys/sysproto.h>
   38 #include <sys/thread.h>
   39 
   40 #include <sys/mplock2.h>
   41 
   42 #include <arch_linux/linux.h>
   43 #include <arch_linux/linux_proto.h>
   44 #include "linux_util.h"
   45 
   46 DUMMY(setfsuid16);
   47 DUMMY(setfsgid16);
   48 DUMMY(getresuid16);
   49 DUMMY(getresgid16);
   50 
   51 #define CAST_NOCHG(x)   ((x == 0xFFFF) ? -1 : x)
   52 
   53 /*
   54  * MPALMOSTSAFE
   55  */
   56 int
   57 sys_linux_chown16(struct linux_chown16_args *args)
   58 {
   59         struct nlookupdata nd;
   60         char *path;
   61         int error;
   62 
   63         error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS);
   64         if (error)
   65                 return (error);
   66 #ifdef DEBUG
   67         if (ldebug(chown16))
   68                 kprintf(ARGS(chown16, "%s, %d, %d"), path, args->uid,
   69                     args->gid);
   70 #endif
   71         get_mplock();
   72         error = nlookup_init(&nd, path, UIO_SYSSPACE, NLC_FOLLOW);
   73         if (error == 0) {
   74                 error = kern_chown(&nd, CAST_NOCHG(args->uid),
   75                                     CAST_NOCHG(args->gid));
   76         }
   77         nlookup_done(&nd);
   78         rel_mplock();
   79         linux_free_path(&path);
   80         return(error);
   81 }
   82 
   83 /*
   84  * MPALMOSTSAFE
   85  */
   86 int
   87 sys_linux_lchown16(struct linux_lchown16_args *args)
   88 {
   89         struct nlookupdata nd;
   90         char *path;
   91         int error;
   92 
   93         error = linux_copyin_path(args->path, &path, LINUX_PATH_EXISTS);
   94         if (error)
   95                 return (error);
   96 #ifdef DEBUG
   97         if (ldebug(lchown16))
   98                 kprintf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
   99                     args->gid);
  100 #endif
  101         get_mplock();
  102         error = nlookup_init(&nd, path, UIO_SYSSPACE, 0);
  103         if (error == 0) {
  104                 error = kern_chown(&nd, CAST_NOCHG(args->uid),
  105                                     CAST_NOCHG(args->gid));
  106         }
  107         nlookup_done(&nd);
  108         rel_mplock();
  109         linux_free_path(&path);
  110         return(error);
  111 }
  112 
  113 /*
  114  * MPALMOSTSAFE
  115  */
  116 int
  117 sys_linux_setgroups16(struct linux_setgroups16_args *args)
  118 {
  119         struct thread *td = curthread;
  120         struct proc *p = td->td_proc;
  121         struct ucred *newcred, *oldcred;
  122         l_gid16_t linux_gidset[NGROUPS];
  123         gid_t *bsd_gidset;
  124         int ngrp, error;
  125 
  126 #ifdef DEBUG
  127         if (ldebug(setgroups16))
  128                 kprintf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
  129 #endif
  130 
  131         ngrp = args->gidsetsize;
  132         oldcred = td->td_ucred;
  133 
  134         /*
  135          * cr_groups[0] holds egid. Setting the whole set from
  136          * the supplied set will cause egid to be changed too.
  137          * Keep cr_groups[0] unchanged to prevent that.
  138          */
  139 
  140         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0)
  141                 return (error);
  142 
  143         if ((u_int)ngrp >= NGROUPS)
  144                 return (EINVAL);
  145 
  146         get_mplock();
  147         newcred = crdup(oldcred);
  148         if (ngrp > 0) {
  149                 error = copyin((caddr_t)args->gidset, linux_gidset,
  150                                ngrp * sizeof(l_gid16_t));
  151                 if (error) {
  152                         crfree(newcred);
  153                         goto done;
  154                 }
  155 
  156                 newcred->cr_ngroups = ngrp + 1;
  157 
  158                 bsd_gidset = newcred->cr_groups;
  159                 ngrp--;
  160                 while (ngrp >= 0) {
  161                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
  162                         ngrp--;
  163                 }
  164         } else {
  165                 newcred->cr_ngroups = 1;
  166         }
  167 
  168         setsugid();
  169         oldcred = p->p_ucred;   /* deal with threads race */
  170         p->p_ucred = newcred;
  171         crfree(oldcred);
  172         error = 0;
  173 done:
  174         rel_mplock();
  175         return (error);
  176 }
  177 
  178 /*
  179  * MPSAFE
  180  */
  181 int
  182 sys_linux_getgroups16(struct linux_getgroups16_args *args)
  183 {
  184         struct proc *p = curproc;
  185         struct ucred *cred;
  186         l_gid16_t linux_gidset[NGROUPS];
  187         gid_t *bsd_gidset;
  188         int bsd_gidsetsz, ngrp, error;
  189 
  190 #ifdef DEBUG
  191         if (ldebug(getgroups16))
  192                 kprintf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
  193 #endif
  194 
  195         cred = p->p_ucred;
  196         bsd_gidset = cred->cr_groups;
  197         bsd_gidsetsz = cred->cr_ngroups - 1;
  198 
  199         /*
  200          * cr_groups[0] holds egid. Returning the whole set
  201          * here will cause a duplicate. Exclude cr_groups[0]
  202          * to prevent that.
  203          */
  204 
  205         if ((ngrp = args->gidsetsize) == 0) {
  206                 args->sysmsg_result = bsd_gidsetsz;
  207                 return (0);
  208         }
  209 
  210         if ((u_int)ngrp < (u_int)bsd_gidsetsz)
  211                 return (EINVAL);
  212 
  213         ngrp = 0;
  214         while (ngrp < bsd_gidsetsz) {
  215                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
  216                 ngrp++;
  217         }
  218 
  219         error = copyout(linux_gidset, (caddr_t)args->gidset,
  220                         ngrp * sizeof(l_gid16_t));
  221         if (error)
  222                 return (error);
  223 
  224         args->sysmsg_result = ngrp;
  225         return (0);
  226 }
  227 
  228 /*
  229  * The FreeBSD native getgid(2) and getuid(2) also modify p->p_retval[1]
  230  * when COMPAT_43 is defined. This globbers registers that
  231  * are assumed to be preserved. The following lightweight syscalls fixes
  232  * this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in
  233  * linux_misc.c
  234  *
  235  * linux_getgid16() - MP SAFE
  236  * linux_getuid16() - MP SAFE
  237  */
  238 
  239 /*
  240  * MPSAFE
  241  */
  242 int
  243 sys_linux_getgid16(struct linux_getgid16_args *args)
  244 {
  245         struct proc *p = curproc;
  246 
  247         args->sysmsg_result = p->p_ucred->cr_rgid;
  248         return (0);
  249 }
  250 
  251 /*
  252  * MPSAFE
  253  */
  254 int
  255 sys_linux_getuid16(struct linux_getuid16_args *args)
  256 {
  257         struct proc *p = curproc;
  258 
  259         args->sysmsg_result = p->p_ucred->cr_ruid;
  260         return (0);
  261 }
  262 
  263 /*
  264  * MPSAFE
  265  */
  266 int
  267 sys_linux_getegid16(struct linux_getegid16_args *args)
  268 {
  269         struct getegid_args bsd;
  270         int error;
  271 
  272         bsd.sysmsg_result = 0;
  273 
  274         error = sys_getegid(&bsd);
  275         args->sysmsg_result = bsd.sysmsg_result;
  276         return(error);
  277 }
  278 
  279 /*
  280  * MPSAFE
  281  */
  282 int
  283 sys_linux_geteuid16(struct linux_geteuid16_args *args)
  284 {
  285         struct geteuid_args bsd;
  286         int error;
  287 
  288         bsd.sysmsg_result = 0;
  289 
  290         error = sys_geteuid(&bsd);
  291         args->sysmsg_result = bsd.sysmsg_result;
  292         return(error);
  293 }
  294 
  295 /*
  296  * MPSAFE
  297  */
  298 int
  299 sys_linux_setgid16(struct linux_setgid16_args *args)
  300 {
  301         struct setgid_args bsd;
  302         int error;
  303 
  304         bsd.gid = args->gid;
  305         bsd.sysmsg_result = 0;
  306 
  307         error = sys_setgid(&bsd);
  308         args->sysmsg_result = bsd.sysmsg_result;
  309         return(error);
  310 }
  311 
  312 /*
  313  * MPSAFE
  314  */
  315 int
  316 sys_linux_setuid16(struct linux_setuid16_args *args)
  317 {
  318         struct setuid_args bsd;
  319         int error;
  320 
  321         bsd.uid = args->uid;
  322         bsd.sysmsg_result = 0;
  323 
  324         error = sys_setuid(&bsd);
  325         args->sysmsg_result = bsd.sysmsg_result;
  326         return(error);
  327 }
  328 
  329 /*
  330  * MPSAFE
  331  */
  332 int
  333 sys_linux_setregid16(struct linux_setregid16_args *args)
  334 {
  335         struct setregid_args bsd;
  336         int error;
  337 
  338         bsd.rgid = CAST_NOCHG(args->rgid);
  339         bsd.egid = CAST_NOCHG(args->egid);
  340         bsd.sysmsg_result = 0;
  341 
  342         error = sys_setregid(&bsd);
  343         args->sysmsg_result = bsd.sysmsg_result;
  344         return(error);
  345 }
  346 
  347 /*
  348  * MPSAFE
  349  */
  350 int
  351 sys_linux_setreuid16(struct linux_setreuid16_args *args)
  352 {
  353         struct setreuid_args bsd;
  354         int error;
  355 
  356         bsd.ruid = CAST_NOCHG(args->ruid);
  357         bsd.euid = CAST_NOCHG(args->euid);
  358         bsd.sysmsg_result = 0;
  359 
  360         error = sys_setreuid(&bsd);
  361         args->sysmsg_result = bsd.sysmsg_result;
  362         return(error);
  363 }
  364 
  365 /*
  366  * MPSAFE
  367  */
  368 int
  369 sys_linux_setresgid16(struct linux_setresgid16_args *args)
  370 {
  371         struct setresgid_args bsd;
  372         int error;
  373 
  374         bsd.rgid = CAST_NOCHG(args->rgid);
  375         bsd.egid = CAST_NOCHG(args->egid);
  376         bsd.sgid = CAST_NOCHG(args->sgid);
  377         bsd.sysmsg_result = 0;
  378 
  379         error = sys_setresgid(&bsd);
  380         args->sysmsg_result = bsd.sysmsg_result;
  381         return(error);
  382 }
  383 
  384 /*
  385  * MPSAFE
  386  */
  387 int
  388 sys_linux_setresuid16(struct linux_setresuid16_args *args)
  389 {
  390         struct setresuid_args bsd;
  391         int error;
  392 
  393         bsd.ruid = CAST_NOCHG(args->ruid);
  394         bsd.euid = CAST_NOCHG(args->euid);
  395         bsd.suid = CAST_NOCHG(args->suid);
  396         bsd.sysmsg_result = 0;
  397 
  398         error = sys_setresuid(&bsd);
  399         args->sysmsg_result = bsd.sysmsg_result;
  400         return(error);
  401 }
  402 

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