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/freebsd32/freebsd32_capability.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 The FreeBSD Foundation
    5  *
    6  * This software was developed by Pawel Jakub Dawidek under sponsorship from
    7  * the FreeBSD Foundation.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include "opt_capsicum.h"
   35 
   36 #include <sys/param.h>
   37 #include <sys/capsicum.h>
   38 #include <sys/filedesc.h>
   39 #include <sys/limits.h>
   40 #include <sys/malloc.h>
   41 #include <sys/proc.h>
   42 #include <sys/syscallsubr.h>
   43 #include <sys/sysproto.h>
   44 
   45 #include <security/audit/audit.h>
   46 
   47 #include <compat/freebsd32/freebsd32_proto.h>
   48 
   49 #ifdef CAPABILITIES
   50 
   51 MALLOC_DECLARE(M_FILECAPS);
   52 
   53 int
   54 freebsd32_cap_ioctls_limit(struct thread *td,
   55     struct freebsd32_cap_ioctls_limit_args *uap)
   56 {
   57         u_long *cmds;
   58         uint32_t *cmds32;
   59         size_t ncmds;
   60         u_int i;
   61         int error;
   62 
   63         ncmds = uap->ncmds;
   64 
   65         if (ncmds > 256)        /* XXX: Is 256 sane? */
   66                 return (EINVAL);
   67 
   68         if (ncmds == 0) {
   69                 cmds = NULL;
   70         } else {
   71                 cmds32 = malloc(sizeof(cmds32[0]) * ncmds, M_FILECAPS, M_WAITOK);
   72                 error = copyin(uap->cmds, cmds32, sizeof(cmds32[0]) * ncmds);
   73                 if (error != 0) {
   74                         free(cmds32, M_FILECAPS);
   75                         return (error);
   76                 }
   77                 cmds = malloc(sizeof(cmds[0]) * ncmds, M_FILECAPS, M_WAITOK);
   78                 for (i = 0; i < ncmds; i++)
   79                         cmds[i] = cmds32[i];
   80                 free(cmds32, M_FILECAPS);
   81         }
   82 
   83         return (kern_cap_ioctls_limit(td, uap->fd, cmds, ncmds));
   84 }
   85 
   86 int
   87 freebsd32_cap_ioctls_get(struct thread *td,
   88     struct freebsd32_cap_ioctls_get_args *uap)
   89 {
   90         struct filedesc *fdp;
   91         struct filedescent *fdep;
   92         uint32_t *cmds32;
   93         u_long *cmds;
   94         size_t maxcmds;
   95         int error, fd;
   96         u_int i;
   97 
   98         fd = uap->fd;
   99         cmds32 = uap->cmds;
  100         maxcmds = uap->maxcmds;
  101 
  102         AUDIT_ARG_FD(fd);
  103 
  104         fdp = td->td_proc->p_fd;
  105         FILEDESC_SLOCK(fdp);
  106 
  107         if (fget_locked(fdp, fd) == NULL) {
  108                 error = EBADF;
  109                 goto out;
  110         }
  111 
  112         /*
  113          * If all ioctls are allowed (fde_nioctls == -1 && fde_ioctls == NULL)
  114          * the only sane thing we can do is to not populate the given array and
  115          * return CAP_IOCTLS_ALL (actually, INT_MAX).
  116          */
  117 
  118         fdep = &fdp->fd_ofiles[fd];
  119         cmds = fdep->fde_ioctls;
  120         if (cmds32 != NULL && cmds != NULL) {
  121                 for (i = 0; i < MIN(fdep->fde_nioctls, maxcmds); i++) {
  122                         error = suword32(&cmds32[i], cmds[i]);
  123                         if (error != 0)
  124                                 goto out;
  125                 }
  126         }
  127         if (fdep->fde_nioctls == -1)
  128                 td->td_retval[0] = INT_MAX;
  129         else
  130                 td->td_retval[0] = fdep->fde_nioctls;
  131 
  132         error = 0;
  133 out:
  134         FILEDESC_SUNLOCK(fdp);
  135         return (error);
  136 }
  137 
  138 #else /* !CAPABILITIES */
  139 
  140 int
  141 freebsd32_cap_ioctls_limit(struct thread *td,
  142     struct freebsd32_cap_ioctls_limit_args *uap)
  143 {
  144 
  145         return (ENOSYS);
  146 }
  147 
  148 int
  149 freebsd32_cap_ioctls_get(struct thread *td,
  150     struct freebsd32_cap_ioctls_get_args *uap)
  151 {
  152 
  153         return (ENOSYS);
  154 }
  155 
  156 #endif /* CAPABILITIES */

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