1/*	$NetBSD: netbsd32_execve.c,v 1.33.2.2 2013/02/08 20:45:50 riz 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 1.33.2.2 2013/02/08 20:45:50 riz 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	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
80int
81netbsd32_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
98static int
99netbsd32_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
160out:
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
169int
170netbsd32_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