| 1 | /* $NetBSD: netbsd32_execve.c,v 1.38 2014/02/02 14:48:57 martin Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1998, 2001 Matthew R. Green |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 21 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 22 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 23 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 24 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <sys/cdefs.h> |
| 30 | |
| 31 | __KERNEL_RCSID(0, "$NetBSD: netbsd32_execve.c,v 1.38 2014/02/02 14:48:57 martin Exp $" ); |
| 32 | |
| 33 | #include <sys/param.h> |
| 34 | #include <sys/systm.h> |
| 35 | #include <sys/atomic.h> |
| 36 | #include <sys/mount.h> |
| 37 | #include <sys/namei.h> |
| 38 | #include <sys/stat.h> |
| 39 | #include <sys/spawn.h> |
| 40 | #include <sys/uidinfo.h> |
| 41 | #include <sys/vnode.h> |
| 42 | #include <sys/file.h> |
| 43 | #include <sys/filedesc.h> |
| 44 | #include <sys/syscallargs.h> |
| 45 | #include <sys/proc.h> |
| 46 | #include <sys/exec.h> |
| 47 | |
| 48 | #include <compat/netbsd32/netbsd32.h> |
| 49 | #include <compat/netbsd32/netbsd32_syscall.h> |
| 50 | #include <compat/netbsd32/netbsd32_syscallargs.h> |
| 51 | |
| 52 | static int |
| 53 | netbsd32_execve_fetch_element(char * const *array, size_t index, char **value) |
| 54 | { |
| 55 | int error; |
| 56 | netbsd32_charp const *a32 = (void const *)array; |
| 57 | netbsd32_charp e; |
| 58 | |
| 59 | error = copyin(a32 + index, &e, sizeof(e)); |
| 60 | if (error) |
| 61 | return error; |
| 62 | *value = (char *)NETBSD32PTR64(e); |
| 63 | return 0; |
| 64 | } |
| 65 | |
| 66 | int |
| 67 | netbsd32_execve(struct lwp *l, const struct netbsd32_execve_args *uap, register_t *retval) |
| 68 | { |
| 69 | /* { |
| 70 | syscallarg(const netbsd32_charp) path; |
| 71 | syscallarg(netbsd32_charpp) argp; |
| 72 | syscallarg(netbsd32_charpp) envp; |
| 73 | } */ |
| 74 | const char *path = SCARG_P32(uap, path); |
| 75 | |
| 76 | return execve1(l, path, SCARG_P32(uap, argp), |
| 77 | SCARG_P32(uap, envp), netbsd32_execve_fetch_element); |
| 78 | } |
| 79 | |
| 80 | int |
| 81 | netbsd32_fexecve(struct lwp *l, const struct netbsd32_fexecve_args *uap, |
| 82 | register_t *retval) |
| 83 | { |
| 84 | /* { |
| 85 | syscallarg(int) fd; |
| 86 | syscallarg(netbsd32_charpp) argp; |
| 87 | syscallarg(netbsd32_charpp) envp; |
| 88 | } */ |
| 89 | struct sys_fexecve_args ua; |
| 90 | |
| 91 | NETBSD32TO64_UAP(fd); |
| 92 | NETBSD32TOP_UAP(argp, char * const); |
| 93 | NETBSD32TOP_UAP(envp, char * const); |
| 94 | |
| 95 | return sys_fexecve(l, &ua, retval); |
| 96 | } |
| 97 | |
| 98 | static int |
| 99 | netbsd32_posix_spawn_fa_alloc(struct posix_spawn_file_actions **fap, |
| 100 | const struct netbsd32_posix_spawn_file_actions *ufa, rlim_t lim) |
| 101 | { |
| 102 | struct posix_spawn_file_actions *fa; |
| 103 | struct netbsd32_posix_spawn_file_actions fa32; |
| 104 | struct netbsd32_posix_spawn_file_actions_entry *fae32 = NULL, *f32 = NULL; |
| 105 | struct posix_spawn_file_actions_entry *fae; |
| 106 | char *pbuf = NULL; |
| 107 | int error; |
| 108 | size_t fal, fal32, slen, i = 0; |
| 109 | |
| 110 | error = copyin(ufa, &fa32, sizeof(fa32)); |
| 111 | if (error) |
| 112 | return error; |
| 113 | |
| 114 | if (fa32.len == 0) |
| 115 | return 0; |
| 116 | |
| 117 | fa = kmem_alloc(sizeof(*fa), KM_SLEEP); |
| 118 | fa->len = fa->size = fa32.len; |
| 119 | |
| 120 | if (fa->len > lim) { |
| 121 | kmem_free(fa, sizeof(*fa)); |
| 122 | return EINVAL; |
| 123 | } |
| 124 | |
| 125 | fal = fa->len * sizeof(*fae); |
| 126 | fal32 = fa->len * sizeof(*fae32); |
| 127 | |
| 128 | fa->fae = kmem_alloc(fal, KM_SLEEP); |
| 129 | fae32 = kmem_alloc(fal32, KM_SLEEP); |
| 130 | error = copyin(NETBSD32PTR64(fa32.fae), fae32, fal32); |
| 131 | if (error) |
| 132 | goto out; |
| 133 | |
| 134 | pbuf = PNBUF_GET(); |
| 135 | for (; i < fa->len; i++) { |
| 136 | fae = &fa->fae[i]; |
| 137 | f32 = &fae32[i]; |
| 138 | fae->fae_action = f32->fae_action; |
| 139 | fae->fae_fildes = f32->fae_fildes; |
| 140 | if (fae->fae_action == FAE_DUP2) |
| 141 | fae->fae_data.dup2.newfildes = |
| 142 | f32->fae_data.dup2.newfildes; |
| 143 | if (fae->fae_action != FAE_OPEN) |
| 144 | continue; |
| 145 | error = copyinstr(NETBSD32PTR64(f32->fae_path), pbuf, |
| 146 | MAXPATHLEN, &slen); |
| 147 | if (error) |
| 148 | goto out; |
| 149 | fae->fae_path = kmem_alloc(slen, KM_SLEEP); |
| 150 | memcpy(fae->fae_path, pbuf, slen); |
| 151 | fae->fae_oflag = f32->fae_oflag; |
| 152 | fae->fae_mode = f32->fae_mode; |
| 153 | } |
| 154 | PNBUF_PUT(pbuf); |
| 155 | if (fae32) |
| 156 | kmem_free(fae32, fal32); |
| 157 | *fap = fa; |
| 158 | return 0; |
| 159 | |
| 160 | out: |
| 161 | if (fae32) |
| 162 | kmem_free(fae32, fal32); |
| 163 | if (pbuf) |
| 164 | PNBUF_PUT(pbuf); |
| 165 | posix_spawn_fa_free(fa, i); |
| 166 | return error; |
| 167 | } |
| 168 | |
| 169 | int |
| 170 | netbsd32_posix_spawn(struct lwp *l, |
| 171 | const struct netbsd32_posix_spawn_args *uap, register_t *retval) |
| 172 | { |
| 173 | /* { |
| 174 | syscallarg(netbsd32_pid_tp) pid; |
| 175 | syscallarg(const netbsd32_charp) path; |
| 176 | syscallarg(const netbsd32_posix_spawn_file_actionsp) file_actions; |
| 177 | syscallarg(const netbsd32_posix_spawnattrp) attrp; |
| 178 | syscallarg(netbsd32_charpp) argv; |
| 179 | syscallarg(netbsd32_charpp) envp; |
| 180 | } */ |
| 181 | |
| 182 | int error; |
| 183 | struct posix_spawn_file_actions *fa = NULL; |
| 184 | struct posix_spawnattr *sa = NULL; |
| 185 | pid_t pid; |
| 186 | bool child_ok = false; |
| 187 | rlim_t max_fileactions; |
| 188 | proc_t *p = l->l_proc; |
| 189 | |
| 190 | error = check_posix_spawn(l); |
| 191 | if (error) { |
| 192 | *retval = error; |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | /* copy in file_actions struct */ |
| 197 | if (SCARG_P32(uap, file_actions) != NULL) { |
| 198 | max_fileactions = 2 * min(p->p_rlimit[RLIMIT_NOFILE].rlim_cur, |
| 199 | maxfiles); |
| 200 | error = netbsd32_posix_spawn_fa_alloc(&fa, |
| 201 | SCARG_P32(uap, file_actions), max_fileactions); |
| 202 | if (error) |
| 203 | goto error_exit; |
| 204 | } |
| 205 | |
| 206 | /* copyin posix_spawnattr struct */ |
| 207 | if (SCARG_P32(uap, attrp) != NULL) { |
| 208 | sa = kmem_alloc(sizeof(*sa), KM_SLEEP); |
| 209 | error = copyin(SCARG_P32(uap, attrp), sa, sizeof(*sa)); |
| 210 | if (error) |
| 211 | goto error_exit; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * Do the spawn |
| 216 | */ |
| 217 | error = do_posix_spawn(l, &pid, &child_ok, SCARG_P32(uap, path), fa, |
| 218 | sa, SCARG_P32(uap, argv), SCARG_P32(uap, envp), |
| 219 | netbsd32_execve_fetch_element); |
| 220 | if (error) |
| 221 | goto error_exit; |
| 222 | |
| 223 | if (error == 0 && SCARG_P32(uap, pid) != NULL) |
| 224 | error = copyout(&pid, SCARG_P32(uap, pid), sizeof(pid)); |
| 225 | |
| 226 | *retval = error; |
| 227 | return 0; |
| 228 | |
| 229 | error_exit: |
| 230 | if (!child_ok) { |
| 231 | (void)chgproccnt(kauth_cred_getuid(l->l_cred), -1); |
| 232 | atomic_dec_uint(&nprocs); |
| 233 | |
| 234 | if (sa) |
| 235 | kmem_free(sa, sizeof(*sa)); |
| 236 | if (fa) |
| 237 | posix_spawn_fa_free(fa, fa->len); |
| 238 | } |
| 239 | |
| 240 | *retval = error; |
| 241 | return 0; |
| 242 | } |
| 243 | |