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

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