FreeBSD/Linux Kernel Cross Reference
sys/compat/freebsd32/freebsd32_capability.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2013 The FreeBSD Foundation
      * All rights reserved.
      *
      * This software was developed by Pawel Jakub Dawidek under sponsorship from
      * the FreeBSD Foundation.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/compat/freebsd32/freebsd32_capability.c 326266 2017-11-27 15:13:23Z pfg $");
    
    #include "opt_capsicum.h"
    
    #include <sys/param.h>
    #include <sys/capsicum.h>
    #include <sys/filedesc.h>
    #include <sys/malloc.h>
    #include <sys/proc.h>
    #include <sys/syscallsubr.h>
    #include <sys/sysproto.h>
    
    #include <security/audit/audit.h>
    
    #include <compat/freebsd32/freebsd32_proto.h>
    
    #ifdef CAPABILITIES
    
    MALLOC_DECLARE(M_FILECAPS);
    
    int
    freebsd32_cap_ioctls_limit(struct thread *td,
        struct freebsd32_cap_ioctls_limit_args *uap)
    {
            u_long *cmds;
            uint32_t *cmds32;
            size_t ncmds;
            u_int i;
            int error;
    
            ncmds = uap->ncmds;
    
            if (ncmds > 256)        /* XXX: Is 256 sane? */
                    return (EINVAL);
    
            if (ncmds == 0) {
                    cmds = NULL;
            } else {
                    cmds32 = malloc(sizeof(cmds32[0]) * ncmds, M_FILECAPS, M_WAITOK);
                    error = copyin(uap->cmds, cmds32, sizeof(cmds32[0]) * ncmds);
                    if (error != 0) {
                            free(cmds32, M_FILECAPS);
                            return (error);
                    }
                    cmds = malloc(sizeof(cmds[0]) * ncmds, M_FILECAPS, M_WAITOK);
                    for (i = 0; i < ncmds; i++)
                            cmds[i] = cmds32[i];
                    free(cmds32, M_FILECAPS);
            }
    
            return (kern_cap_ioctls_limit(td, uap->fd, cmds, ncmds));
    }
    
    int
    freebsd32_cap_ioctls_get(struct thread *td,
        struct freebsd32_cap_ioctls_get_args *uap)
    {
            struct filedesc *fdp;
            struct filedescent *fdep;
            uint32_t *cmds32;
            u_long *cmds;
            size_t maxcmds;
            int error, fd;
            u_int i;
    
            fd = uap->fd;
            cmds32 = uap->cmds;
           maxcmds = uap->maxcmds;
   
           AUDIT_ARG_FD(fd);
   
           fdp = td->td_proc->p_fd;
           FILEDESC_SLOCK(fdp);
   
           if (fget_locked(fdp, fd) == NULL) {
                   error = EBADF;
                   goto out;
           }
   
           /*
            * If all ioctls are allowed (fde_nioctls == -1 && fde_ioctls == NULL)
            * the only sane thing we can do is to not populate the given array and
            * return CAP_IOCTLS_ALL (actually, INT_MAX).
            */
   
           fdep = &fdp->fd_ofiles[fd];
           cmds = fdep->fde_ioctls;
           if (cmds32 != NULL && cmds != NULL) {
                   for (i = 0; i < MIN(fdep->fde_nioctls, maxcmds); i++) {
                           error = suword32(&cmds32[i], cmds[i]);
                           if (error != 0)
                                   goto out;
                   }
           }
           if (fdep->fde_nioctls == -1)
                   td->td_retval[0] = INT_MAX;
           else
                   td->td_retval[0] = fdep->fde_nioctls;
   
           error = 0;
   out:
           FILEDESC_SUNLOCK(fdp);
           return (error);
   }
   
   #else /* !CAPABILITIES */
   
   int
   freebsd32_cap_ioctls_limit(struct thread *td,
       struct freebsd32_cap_ioctls_limit_args *uap)
   {
   
           return (ENOSYS);
   }
   
   int
   freebsd32_cap_ioctls_get(struct thread *td,
       struct freebsd32_cap_ioctls_get_args *uap)
   {
   
           return (ENOSYS);
   }
   
   #endif /* CAPABILITIES */

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