netbsd32_execve.c revision 1.42
1/* $NetBSD: netbsd32_execve.c,v 1.42 2020/04/19 20:31:59 thorpej 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 1.42 2020/04/19 20:31:59 thorpej 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 52static int 53netbsd32_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 66int 67netbsd32_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 75 return execve1(l, true, SCARG_P32(uap, path), -1, SCARG_P32(uap, argp), 76 SCARG_P32(uap, envp), netbsd32_execve_fetch_element); 77} 78 79int 80netbsd32_fexecve(struct lwp *l, const struct netbsd32_fexecve_args *uap, 81 register_t *retval) 82{ 83 /* { 84 syscallarg(int) fd; 85 syscallarg(netbsd32_charpp) argp; 86 syscallarg(netbsd32_charpp) envp; 87 } */ 88 89 return execve1(l, false, NULL, SCARG(uap, fd), SCARG_P32(uap, argp), 90 SCARG_P32(uap, envp), netbsd32_execve_fetch_element); 91} 92 93static int 94netbsd32_posix_spawn_fa_alloc(struct posix_spawn_file_actions **fap, 95 const struct netbsd32_posix_spawn_file_actions *ufa, rlim_t lim) 96{ 97 struct posix_spawn_file_actions *fa; 98 struct netbsd32_posix_spawn_file_actions fa32; 99 struct netbsd32_posix_spawn_file_actions_entry *fae32 = NULL, *f32 = NULL; 100 struct posix_spawn_file_actions_entry *fae; 101 char *pbuf = NULL; 102 int error; 103 size_t fal, fal32, slen, i = 0; 104 105 error = copyin(ufa, &fa32, sizeof(fa32)); 106 if (error) 107 return error; 108 109 if (fa32.len == 0) 110 return 0; 111 112 fa = kmem_alloc(sizeof(*fa), KM_SLEEP); 113 fa->len = fa->size = fa32.len; 114 115 if (fa->len > lim) { 116 kmem_free(fa, sizeof(*fa)); 117 return EINVAL; 118 } 119 120 fal = fa->len * sizeof(*fae); 121 fal32 = fa->len * sizeof(*fae32); 122 123 fa->fae = kmem_alloc(fal, KM_SLEEP); 124 fae32 = kmem_alloc(fal32, KM_SLEEP); 125 error = copyin(NETBSD32PTR64(fa32.fae), fae32, fal32); 126 if (error) 127 goto out; 128 129 pbuf = PNBUF_GET(); 130 for (; i < fa->len; i++) { 131 fae = &fa->fae[i]; 132 f32 = &fae32[i]; 133 fae->fae_action = f32->fae_action; 134 fae->fae_fildes = f32->fae_fildes; 135 if (fae->fae_action == FAE_DUP2) 136 fae->fae_data.dup2.newfildes = 137 f32->fae_data.dup2.newfildes; 138 if (fae->fae_action != FAE_OPEN) 139 continue; 140 error = copyinstr(NETBSD32PTR64(f32->fae_path), pbuf, 141 MAXPATHLEN, &slen); 142 if (error) 143 goto out; 144 fae->fae_path = kmem_alloc(slen, KM_SLEEP); 145 memcpy(fae->fae_path, pbuf, slen); 146 fae->fae_oflag = f32->fae_oflag; 147 fae->fae_mode = f32->fae_mode; 148 } 149 PNBUF_PUT(pbuf); 150 if (fae32) 151 kmem_free(fae32, fal32); 152 *fap = fa; 153 return 0; 154 155out: 156 if (fae32) 157 kmem_free(fae32, fal32); 158 if (pbuf) 159 PNBUF_PUT(pbuf); 160 posix_spawn_fa_free(fa, i); 161 return error; 162} 163 164int 165netbsd32_posix_spawn(struct lwp *l, 166 const struct netbsd32_posix_spawn_args *uap, register_t *retval) 167{ 168 /* { 169 syscallarg(netbsd32_pid_tp) pid; 170 syscallarg(const netbsd32_charp) path; 171 syscallarg(const netbsd32_posix_spawn_file_actionsp) file_actions; 172 syscallarg(const netbsd32_posix_spawnattrp) attrp; 173 syscallarg(netbsd32_charpp) argv; 174 syscallarg(netbsd32_charpp) envp; 175 } */ 176 177 int error; 178 struct posix_spawn_file_actions *fa = NULL; 179 struct posix_spawnattr *sa = NULL; 180 pid_t pid; 181 bool child_ok = false; 182 rlim_t max_fileactions; 183 proc_t *p = l->l_proc; 184 185 /* check_posix_spawn() increments nprocs for us. */ 186 error = check_posix_spawn(l); 187 if (error) { 188 *retval = error; 189 return 0; 190 } 191 192 /* copy in file_actions struct */ 193 if (SCARG_P32(uap, file_actions) != NULL) { 194 max_fileactions = 2 * uimin(p->p_rlimit[RLIMIT_NOFILE].rlim_cur, 195 maxfiles); 196 error = netbsd32_posix_spawn_fa_alloc(&fa, 197 SCARG_P32(uap, file_actions), max_fileactions); 198 if (error) 199 goto error_exit; 200 } 201 202 /* copyin posix_spawnattr struct */ 203 if (SCARG_P32(uap, attrp) != NULL) { 204 sa = kmem_alloc(sizeof(*sa), KM_SLEEP); 205 error = copyin(SCARG_P32(uap, attrp), sa, sizeof(*sa)); 206 if (error) 207 goto error_exit; 208 } 209 210 /* 211 * Do the spawn 212 */ 213 error = do_posix_spawn(l, &pid, &child_ok, SCARG_P32(uap, path), fa, 214 sa, SCARG_P32(uap, argv), SCARG_P32(uap, envp), 215 netbsd32_execve_fetch_element); 216 if (error) 217 goto error_exit; 218 219 if (error == 0 && SCARG_P32(uap, pid) != NULL) 220 error = copyout(&pid, SCARG_P32(uap, pid), sizeof(pid)); 221 222 *retval = error; 223 return 0; 224 225 error_exit: 226 if (!child_ok) { 227 (void)chgproccnt(kauth_cred_getuid(l->l_cred), -1); 228 atomic_dec_uint(&nprocs); 229 230 if (sa) 231 kmem_free(sa, sizeof(*sa)); 232 if (fa) 233 posix_spawn_fa_free(fa, fa->len); 234 } 235 236 *retval = error; 237 return 0; 238} 239