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netbsd32_execve.c revision 1.25 
      1 /*	$NetBSD: netbsd32_execve.c,v 1.25 2005/12/11 12:20:22 christos 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  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     23  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     26  * 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 
     33 #if defined(_KERNEL_OPT)
     34 #include "opt_ktrace.h"
     35 #endif
     36 
     37 __KERNEL_RCSID(0, "$NetBSD: netbsd32_execve.c,v 1.25 2005/12/11 12:20:22 christos Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/systm.h>
     41 #include <sys/mount.h>
     42 #include <sys/stat.h>
     43 #include <sys/vnode.h>
     44 #include <sys/file.h>
     45 #include <sys/filedesc.h>
     46 #include <sys/sa.h>
     47 #include <sys/syscallargs.h>
     48 #include <sys/proc.h>
     49 #include <sys/exec.h>
     50 
     51 #include <compat/netbsd32/netbsd32.h>
     52 #include <compat/netbsd32/netbsd32_syscall.h>
     53 #include <compat/netbsd32/netbsd32_syscallargs.h>
     54 
     55 static int
     56 netbsd32_execve_fetch_element(char * const *array, size_t index, char **value)
     57 {
     58 	int error;
     59 	netbsd32_charp const *a32 = (void const *)array;
     60 	netbsd32_charp e;
     61 
     62 	error = copyin(a32 + index, &e, sizeof(e));
     63 	if (error)
     64 		return error;
     65 	*value = (char *)NETBSD32PTR64(e);
     66 	return 0;
     67 }
     68 
     69 int
     70 netbsd32_execve(struct lwp *l, void *v, register_t *retval)
     71 {
     72 	struct netbsd32_execve_args /* {
     73 		syscallarg(const netbsd32_charp) path;
     74 		syscallarg(netbsd32_charpp) argp;
     75 		syscallarg(netbsd32_charpp) envp;
     76 	} */ *uap = v;
     77 	caddr_t sg;
     78 	const char *path = NETBSD32PTR64(SCARG(uap, path));
     79 
     80 	sg = stackgap_init(l->l_proc, 0);
     81 	CHECK_ALT_EXIST(l, &sg, path);
     82 
     83 	return execve1(l, path, NETBSD32PTR64(SCARG(uap, argp)),
     84 	    NETBSD32PTR64(SCARG(uap, envp)), netbsd32_execve_fetch_element);
     85 }
     86