1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #include "opt_capsicum.h" 33 34 #include <sys/param.h> 35 #include <sys/capsicum.h> 36 #include <sys/filedesc.h> 37 #include <sys/limits.h> 38 #include <sys/malloc.h> 39 #include <sys/proc.h> 40 #include <sys/syscallsubr.h> 41 #include <sys/sysproto.h> 42 43 #include <security/audit/audit.h> 44 45 #include <compat/freebsd32/freebsd32_proto.h> 46 47 #ifdef CAPABILITIES 48 49 MALLOC_DECLARE(M_FILECAPS); 50 51 int 52 freebsd32_cap_ioctls_limit(struct thread *td, 53 struct freebsd32_cap_ioctls_limit_args *uap) 54 { 55 u_long *cmds; 56 uint32_t *cmds32; 57 size_t ncmds; 58 u_int i; 59 int error; 60 61 ncmds = uap->ncmds; 62 63 if (ncmds > 256) /* XXX: Is 256 sane? */ 64 return (EINVAL); 65 66 if (ncmds == 0) { 67 cmds = NULL; 68 } else { 69 cmds32 = malloc(sizeof(cmds32[0]) * ncmds, M_FILECAPS, M_WAITOK); 70 error = copyin(uap->cmds, cmds32, sizeof(cmds32[0]) * ncmds); 71 if (error != 0) { 72 free(cmds32, M_FILECAPS); 73 return (error); 74 } 75 cmds = malloc(sizeof(cmds[0]) * ncmds, M_FILECAPS, M_WAITOK); 76 for (i = 0; i < ncmds; i++) 77 cmds[i] = cmds32[i]; 78 free(cmds32, M_FILECAPS); 79 } 80 81 return (kern_cap_ioctls_limit(td, uap->fd, cmds, ncmds)); 82 } 83 84 int 85 freebsd32_cap_ioctls_get(struct thread *td, 86 struct freebsd32_cap_ioctls_get_args *uap) 87 { 88 struct filedesc *fdp; 89 struct filedescent *fdep; 90 uint32_t *cmds32; 91 u_long *cmds; 92 size_t maxcmds; 93 int error, fd; 94 u_int i; 95 96 fd = uap->fd; 97 cmds32 = uap->cmds; 98 maxcmds = uap->maxcmds; 99 100 AUDIT_ARG_FD(fd); 101 102 fdp = td->td_proc->p_fd; 103 FILEDESC_SLOCK(fdp); 104 105 if (fget_noref(fdp, fd) == NULL) { 106 error = EBADF; 107 goto out; 108 } 109 110 /* 111 * If all ioctls are allowed (fde_nioctls == -1 && fde_ioctls == NULL) 112 * the only sane thing we can do is to not populate the given array and 113 * return CAP_IOCTLS_ALL (actually, INT_MAX). 114 */ 115 116 fdep = &fdp->fd_ofiles[fd]; 117 cmds = fdep->fde_ioctls; 118 if (cmds32 != NULL && cmds != NULL) { 119 for (i = 0; i < MIN(fdep->fde_nioctls, maxcmds); i++) { 120 if (suword32(&cmds32[i], cmds[i]) != 0) { 121 error = EFAULT; 122 goto out; 123 } 124 } 125 } 126 if (fdep->fde_nioctls == -1) 127 td->td_retval[0] = INT_MAX; 128 else 129 td->td_retval[0] = fdep->fde_nioctls; 130 131 error = 0; 132 out: 133 FILEDESC_SUNLOCK(fdp); 134 return (error); 135 } 136 137 #else /* !CAPABILITIES */ 138 139 int 140 freebsd32_cap_ioctls_limit(struct thread *td, 141 struct freebsd32_cap_ioctls_limit_args *uap) 142 { 143 144 return (ENOSYS); 145 } 146 147 int 148 freebsd32_cap_ioctls_get(struct thread *td, 149 struct freebsd32_cap_ioctls_get_args *uap) 150 { 151 152 return (ENOSYS); 153 } 154 155 #endif /* CAPABILITIES */ 156