1 /*-
2 * Copyright (c) 1993, David Greenman
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/5.4/sys/kern/imgact_aout.c 145335 2005-04-20 19:11:07Z cvs2svn $");
29
30 #include <sys/param.h>
31 #include <sys/exec.h>
32 #include <sys/imgact.h>
33 #include <sys/imgact_aout.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
38 #include <sys/proc.h>
39 #include <sys/resourcevar.h>
40 #include <sys/signalvar.h>
41 #include <sys/syscall.h>
42 #include <sys/sysent.h>
43 #include <sys/systm.h>
44 #include <sys/vnode.h>
45
46 #include <machine/frame.h>
47 #include <machine/md_var.h>
48
49 #include <vm/vm.h>
50 #include <vm/pmap.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
53 #include <vm/vm_param.h>
54
55 static int exec_aout_imgact(struct image_params *imgp);
56 static int aout_fixup(register_t **stack_base, struct image_params *imgp);
57
58 struct sysentvec aout_sysvec = {
59 SYS_MAXSYSCALL,
60 sysent,
61 0,
62 0,
63 NULL,
64 0,
65 NULL,
66 NULL,
67 aout_fixup,
68 sendsig,
69 sigcode,
70 &szsigcode,
71 NULL,
72 "FreeBSD a.out",
73 NULL,
74 NULL,
75 MINSIGSTKSZ,
76 PAGE_SIZE,
77 VM_MIN_ADDRESS,
78 VM_MAXUSER_ADDRESS,
79 USRSTACK,
80 PS_STRINGS,
81 VM_PROT_ALL,
82 exec_copyout_strings,
83 exec_setregs,
84 NULL
85 };
86
87 static int
88 aout_fixup(stack_base, imgp)
89 register_t **stack_base;
90 struct image_params *imgp;
91 {
92
93 return (suword(--(*stack_base), imgp->argc));
94 }
95
96 static int
97 exec_aout_imgact(imgp)
98 struct image_params *imgp;
99 {
100 const struct exec *a_out = (const struct exec *) imgp->image_header;
101 struct vmspace *vmspace;
102 struct vnode *vp;
103 vm_map_t map;
104 vm_object_t object;
105 vm_offset_t text_end, data_end;
106 unsigned long virtual_offset;
107 unsigned long file_offset;
108 unsigned long bss_size;
109 int error;
110
111 GIANT_REQUIRED;
112
113 /*
114 * Linux and *BSD binaries look very much alike,
115 * only the machine id is different:
116 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
117 * NetBSD is in network byte order.. ugh.
118 */
119 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
120 ((a_out->a_magic >> 16) & 0xff) != 0 &&
121 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
122 return -1;
123
124 /*
125 * Set file/virtual offset based on a.out variant.
126 * We do two cases: host byte order and network byte order
127 * (for NetBSD compatibility)
128 */
129 switch ((int)(a_out->a_magic & 0xffff)) {
130 case ZMAGIC:
131 virtual_offset = 0;
132 if (a_out->a_text) {
133 file_offset = PAGE_SIZE;
134 } else {
135 /* Bill's "screwball mode" */
136 file_offset = 0;
137 }
138 break;
139 case QMAGIC:
140 virtual_offset = PAGE_SIZE;
141 file_offset = 0;
142 /* Pass PS_STRINGS for BSD/OS binaries only. */
143 if (N_GETMID(*a_out) == MID_ZERO)
144 imgp->ps_strings = aout_sysvec.sv_psstrings;
145 break;
146 default:
147 /* NetBSD compatibility */
148 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
149 case ZMAGIC:
150 case QMAGIC:
151 virtual_offset = PAGE_SIZE;
152 file_offset = 0;
153 break;
154 default:
155 return (-1);
156 }
157 }
158
159 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
160
161 /*
162 * Check various fields in header for validity/bounds.
163 */
164 if (/* entry point must lay with text region */
165 a_out->a_entry < virtual_offset ||
166 a_out->a_entry >= virtual_offset + a_out->a_text ||
167
168 /* text and data size must each be page rounded */
169 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
170 return (-1);
171
172 /* text + data can't exceed file size */
173 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
174 return (EFAULT);
175
176 /*
177 * text/data/bss must not exceed limits
178 */
179 PROC_LOCK(imgp->proc);
180 if (/* text can't exceed maximum text size */
181 a_out->a_text > maxtsiz ||
182
183 /* data + bss can't exceed rlimit */
184 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
185 PROC_UNLOCK(imgp->proc);
186 return (ENOMEM);
187 }
188 PROC_UNLOCK(imgp->proc);
189
190 /* copy in arguments and/or environment from old process */
191 error = exec_extract_strings(imgp);
192 if (error)
193 return (error);
194
195 /*
196 * Destroy old process VM and create a new one (with a new stack)
197 */
198 exec_new_vmspace(imgp, &aout_sysvec);
199
200 /*
201 * The vm space can be changed by exec_new_vmspace
202 */
203 vmspace = imgp->proc->p_vmspace;
204
205 vp = imgp->vp;
206 object = imgp->object;
207 map = &vmspace->vm_map;
208 vm_map_lock(map);
209 vm_object_reference(object);
210
211 text_end = virtual_offset + a_out->a_text;
212 error = vm_map_insert(map, object,
213 file_offset,
214 virtual_offset, text_end,
215 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
216 MAP_COPY_ON_WRITE | MAP_PREFAULT);
217 if (error) {
218 vm_map_unlock(map);
219 return (error);
220 }
221 data_end = text_end + a_out->a_data;
222 if (a_out->a_data) {
223 vm_object_reference(object);
224 error = vm_map_insert(map, object,
225 file_offset + a_out->a_text,
226 text_end, data_end,
227 VM_PROT_ALL, VM_PROT_ALL,
228 MAP_COPY_ON_WRITE | MAP_PREFAULT);
229 if (error) {
230 vm_map_unlock(map);
231 return (error);
232 }
233 }
234
235 if (bss_size) {
236 error = vm_map_insert(map, NULL, 0,
237 data_end, data_end + bss_size,
238 VM_PROT_ALL, VM_PROT_ALL, 0);
239 if (error) {
240 vm_map_unlock(map);
241 return (error);
242 }
243 }
244 vm_map_unlock(map);
245
246 /* Fill in process VM information */
247 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
248 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
249 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
250 vmspace->vm_daddr = (caddr_t) (uintptr_t)
251 (virtual_offset + a_out->a_text);
252
253 /* Fill in image_params */
254 imgp->interpreted = 0;
255 imgp->entry_addr = a_out->a_entry;
256
257 imgp->proc->p_sysent = &aout_sysvec;
258
259 return (0);
260 }
261
262 /*
263 * Tell kern_execve.c about it, with a little help from the linker.
264 */
265 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
266 EXEC_SET(aout, aout_execsw);
Cache object: baaed6ca0da6e96470789d8c8559a6b3
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