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/9.2/sys/compat/linux/linux_uid16.c 246290 2013-02-03 18:14:37Z dchagin $");
   29 
   30 #include "opt_compat.h"
   31 #include "opt_kdtrace.h"
   32 
   33 #include <sys/fcntl.h>
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mutex.h>
   39 #include <sys/priv.h>
   40 #include <sys/proc.h>
   41 #include <sys/sdt.h>
   42 #include <sys/syscallsubr.h>
   43 #include <sys/sysproto.h>
   44 #include <sys/systm.h>
   45 
   46 #ifdef COMPAT_LINUX32
   47 #include <machine/../linux32/linux.h>
   48 #include <machine/../linux32/linux32_proto.h>
   49 #else
   50 #include <machine/../linux/linux.h>
   51 #include <machine/../linux/linux_proto.h>
   52 #endif
   53 
   54 #include <compat/linux/linux_dtrace.h>
   55 #include <compat/linux/linux_util.h>
   56 
   57 /* DTrace init */
   58 LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
   59 
   60 /**
   61  * DTrace probes in this module.
   62  */
   63 LIN_SDT_PROBE_DEFINE3(uid16, linux_chown16, entry, "char *", "l_uid16_t",
   64     "l_gid16_t");
   65 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *");
   66 LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, return, "int");
   67 LIN_SDT_PROBE_DEFINE3(uid16, linux_lchown16, entry, "char *", "l_uid16_t",
   68     "l_gid16_t");
   69 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *");
   70 LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, return, "int");
   71 LIN_SDT_PROBE_DEFINE2(uid16, linux_setgroups16, entry, "l_uint", "l_gid16_t *");
   72 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int");
   73 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int");
   74 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, return, "int");
   75 LIN_SDT_PROBE_DEFINE2(uid16, linux_getgroups16, entry, "l_uint", "l_gid16_t *");
   76 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int");
   77 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, return, "int");
   78 LIN_SDT_PROBE_DEFINE0(uid16, linux_getgid16, entry);
   79 LIN_SDT_PROBE_DEFINE1(uid16, linux_getgid16, return, "int");
   80 LIN_SDT_PROBE_DEFINE0(uid16, linux_getuid16, entry);
   81 LIN_SDT_PROBE_DEFINE1(uid16, linux_getuid16, return, "int");
   82 LIN_SDT_PROBE_DEFINE0(uid16, linux_getegid16, entry);
   83 LIN_SDT_PROBE_DEFINE1(uid16, linux_getegid16, return, "int");
   84 LIN_SDT_PROBE_DEFINE0(uid16, linux_geteuid16, entry);
   85 LIN_SDT_PROBE_DEFINE1(uid16, linux_geteuid16, return, "int");
   86 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, entry, "l_gid16_t");
   87 LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, return, "int");
   88 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, entry, "l_uid16_t");
   89 LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, return, "int");
   90 LIN_SDT_PROBE_DEFINE2(uid16, linux_setregid16, entry, "l_git16_t", "l_git16_t");
   91 LIN_SDT_PROBE_DEFINE1(uid16, linux_setregid16, return, "int");
   92 LIN_SDT_PROBE_DEFINE2(uid16, linux_setreuid16, entry, "l_uid16_t", "l_uid16_t");
   93 LIN_SDT_PROBE_DEFINE1(uid16, linux_setreuid16, return, "int");
   94 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresgid16, entry, "l_gid16_t", "l_gid16_t",
   95     "l_gid16_t");
   96 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresgid16, return, "int");
   97 LIN_SDT_PROBE_DEFINE3(uid16, linux_setresuid16, entry, "l_uid16_t", "l_uid16_t",
   98     "l_uid16_t");
   99 LIN_SDT_PROBE_DEFINE1(uid16, linux_setresuid16, return, "int");
  100 
  101 DUMMY(setfsuid16);
  102 DUMMY(setfsgid16);
  103 DUMMY(getresuid16);
  104 DUMMY(getresgid16);
  105 
  106 #define CAST_NOCHG(x)   ((x == 0xFFFF) ? -1 : x)
  107 
  108 int
  109 linux_chown16(struct thread *td, struct linux_chown16_args *args)
  110 {
  111         char *path;
  112         int error;
  113 
  114         LCONVPATHEXIST(td, args->path, &path);
  115 
  116         /*
  117          * The DTrace probes have to be after the LCONVPATHEXIST, as
  118          * LCONVPATHEXIST may return on its own and we do not want to
  119          * have a stray entry without the corresponding return.
  120          */
  121         LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid,
  122             args->gid);
  123         LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
  124 
  125         error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
  126             CAST_NOCHG(args->gid));
  127         LFREEPATH(path);
  128 
  129         LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
  130         return (error);
  131 }
  132 
  133 int
  134 linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
  135 {
  136         char *path;
  137         int error;
  138 
  139         LCONVPATHEXIST(td, args->path, &path);
  140 
  141         /*
  142          * The DTrace probes have to be after the LCONVPATHEXIST, as
  143          * LCONVPATHEXIST may return on its own and we do not want to
  144          * have a stray entry without the corresponding return.
  145          */
  146         LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid,
  147             args->gid);
  148         LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
  149 
  150         error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
  151             CAST_NOCHG(args->gid));
  152         LFREEPATH(path);
  153 
  154         LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
  155         return (error);
  156 }
  157 
  158 int
  159 linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
  160 {
  161         struct ucred *newcred, *oldcred;
  162         l_gid16_t *linux_gidset;
  163         gid_t *bsd_gidset;
  164         int ngrp, error;
  165         struct proc *p;
  166 
  167         LIN_SDT_PROBE2(uid16, linux_setgroups16, entry, args->gidsetsize,
  168             args->gidset);
  169 
  170         ngrp = args->gidsetsize;
  171         if (ngrp < 0 || ngrp >= ngroups_max + 1) {
  172                 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, EINVAL);
  173                 return (EINVAL);
  174         }
  175         linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
  176         error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
  177         if (error) {
  178                 LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error);
  179                 LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
  180                 free(linux_gidset, M_TEMP);
  181                 return (error);
  182         }
  183         newcred = crget();
  184         p = td->td_proc;
  185         PROC_LOCK(p);
  186         oldcred = crcopysafe(p, newcred);
  187 
  188         /*
  189          * cr_groups[0] holds egid. Setting the whole set from
  190          * the supplied set will cause egid to be changed too.
  191          * Keep cr_groups[0] unchanged to prevent that.
  192          */
  193 
  194         if ((error = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
  195                 PROC_UNLOCK(p);
  196                 crfree(newcred);
  197 
  198                 LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error,
  199                     error);
  200                 goto out;
  201         }
  202 
  203         if (ngrp > 0) {
  204                 newcred->cr_ngroups = ngrp + 1;
  205 
  206                 bsd_gidset = newcred->cr_groups;
  207                 ngrp--;
  208                 while (ngrp >= 0) {
  209                         bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
  210                         ngrp--;
  211                 }
  212         }
  213         else
  214                 newcred->cr_ngroups = 1;
  215 
  216         setsugid(td->td_proc);
  217         p->p_ucred = newcred;
  218         PROC_UNLOCK(p);
  219         crfree(oldcred);
  220         error = 0;
  221 out:
  222         free(linux_gidset, M_TEMP);
  223 
  224         LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
  225         return (error);
  226 }
  227 
  228 int
  229 linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
  230 {
  231         struct ucred *cred;
  232         l_gid16_t *linux_gidset;
  233         gid_t *bsd_gidset;
  234         int bsd_gidsetsz, ngrp, error;
  235 
  236         LIN_SDT_PROBE2(uid16, linux_getgroups16, entry, args->gidsetsize,
  237             args->gidset);
  238 
  239         cred = td->td_ucred;
  240         bsd_gidset = cred->cr_groups;
  241         bsd_gidsetsz = cred->cr_ngroups - 1;
  242 
  243         /*
  244          * cr_groups[0] holds egid. Returning the whole set
  245          * here will cause a duplicate. Exclude cr_groups[0]
  246          * to prevent that.
  247          */
  248 
  249         if ((ngrp = args->gidsetsize) == 0) {
  250                 td->td_retval[0] = bsd_gidsetsz;
  251 
  252                 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
  253                 return (0);
  254         }
  255 
  256         if (ngrp < bsd_gidsetsz) {
  257                 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, EINVAL);
  258                 return (EINVAL);
  259         }
  260 
  261         ngrp = 0;
  262         linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
  263             M_TEMP, M_WAITOK);
  264         while (ngrp < bsd_gidsetsz) {
  265                 linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
  266                 ngrp++;
  267         }
  268 
  269         error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
  270         free(linux_gidset, M_TEMP);
  271         if (error) {
  272                 LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error);
  273                 LIN_SDT_PROBE1(uid16, linux_getgroups16, return, error);
  274                 return (error);
  275         }
  276 
  277         td->td_retval[0] = ngrp;
  278 
  279         LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
  280         return (0);
  281 }
  282 
  283 /*
  284  * The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
  285  * when COMPAT_43 is defined. This clobbers registers that are assumed to
  286  * be preserved. The following lightweight syscalls fixes this. See also
  287  * linux_getpid(2), linux_getgid(2) and linux_getuid(2) in linux_misc.c
  288  *
  289  * linux_getgid16() - MP SAFE
  290  * linux_getuid16() - MP SAFE
  291  */
  292 
  293 int
  294 linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
  295 {
  296 
  297         LIN_SDT_PROBE0(uid16, linux_getgid16, entry);
  298 
  299         td->td_retval[0] = td->td_ucred->cr_rgid;
  300 
  301         LIN_SDT_PROBE1(uid16, linux_getgid16, return, 0);
  302         return (0);
  303 }
  304 
  305 int
  306 linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
  307 {
  308 
  309         LIN_SDT_PROBE0(uid16, linux_getuid16, entry);
  310 
  311         td->td_retval[0] = td->td_ucred->cr_ruid;
  312 
  313         LIN_SDT_PROBE1(uid16, linux_getuid16, return, 0);
  314         return (0);
  315 }
  316 
  317 int
  318 linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
  319 {
  320         struct getegid_args bsd;
  321         int error;
  322 
  323         LIN_SDT_PROBE0(uid16, linux_getegid16, entry);
  324 
  325         error = sys_getegid(td, &bsd);
  326 
  327         LIN_SDT_PROBE1(uid16, linux_getegid16, return, error);
  328         return (error);
  329 }
  330 
  331 int
  332 linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
  333 {
  334         struct geteuid_args bsd;
  335         int error;
  336 
  337         LIN_SDT_PROBE0(uid16, linux_geteuid16, entry);
  338 
  339         error = sys_geteuid(td, &bsd);
  340 
  341         LIN_SDT_PROBE1(uid16, linux_geteuid16, return, error);
  342         return (error);
  343 }
  344 
  345 int
  346 linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
  347 {
  348         struct setgid_args bsd;
  349         int error;
  350 
  351         LIN_SDT_PROBE1(uid16, linux_setgid16, entry, args->gid);
  352 
  353         bsd.gid = args->gid;
  354         error = sys_setgid(td, &bsd);
  355 
  356         LIN_SDT_PROBE1(uid16, linux_setgid16, return, error);
  357         return (error);
  358 }
  359 
  360 int
  361 linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
  362 {
  363         struct setuid_args bsd;
  364         int error;
  365 
  366         LIN_SDT_PROBE1(uid16, linux_setuid16, entry, args->uid);
  367 
  368         bsd.uid = args->uid;
  369         error = sys_setuid(td, &bsd);
  370 
  371         LIN_SDT_PROBE1(uid16, linux_setuid16, return, error);
  372         return (error);
  373 }
  374 
  375 int
  376 linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
  377 {
  378         struct setregid_args bsd;
  379         int error;
  380 
  381         LIN_SDT_PROBE2(uid16, linux_setregid16, entry, args->rgid, args->egid);
  382 
  383         bsd.rgid = CAST_NOCHG(args->rgid);
  384         bsd.egid = CAST_NOCHG(args->egid);
  385         error = sys_setregid(td, &bsd);
  386 
  387         LIN_SDT_PROBE1(uid16, linux_setregid16, return, error);
  388         return (error);
  389 }
  390 
  391 int
  392 linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
  393 {
  394         struct setreuid_args bsd;
  395         int error;
  396 
  397         LIN_SDT_PROBE2(uid16, linux_setreuid16, entry, args->ruid, args->euid);
  398 
  399         bsd.ruid = CAST_NOCHG(args->ruid);
  400         bsd.euid = CAST_NOCHG(args->euid);
  401         error = sys_setreuid(td, &bsd);
  402 
  403         LIN_SDT_PROBE1(uid16, linux_setreuid16, return, error);
  404         return (error);
  405 }
  406 
  407 int
  408 linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
  409 {
  410         struct setresgid_args bsd;
  411         int error;
  412 
  413         LIN_SDT_PROBE3(uid16, linux_setresgid16, entry, args->rgid, args->egid,
  414             args->sgid);
  415 
  416         bsd.rgid = CAST_NOCHG(args->rgid);
  417         bsd.egid = CAST_NOCHG(args->egid);
  418         bsd.sgid = CAST_NOCHG(args->sgid);
  419         error = sys_setresgid(td, &bsd);
  420 
  421         LIN_SDT_PROBE1(uid16, linux_setresgid16, return, error);
  422         return (error);
  423 }
  424 
  425 int
  426 linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
  427 {
  428         struct setresuid_args bsd;
  429         int error;
  430 
  431         LIN_SDT_PROBE3(uid16, linux_setresuid16, entry, args->ruid, args->euid,
  432             args->suid);
  433 
  434         bsd.ruid = CAST_NOCHG(args->ruid);
  435         bsd.euid = CAST_NOCHG(args->euid);
  436         bsd.suid = CAST_NOCHG(args->suid);
  437         error = sys_setresuid(td, &bsd);
  438 
  439         LIN_SDT_PROBE1(uid16, linux_setresuid16, return, error);
  440         return (error);
  441 }

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