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 | |