1 /*-
2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994-1996 Søren Schmidt
4 * All rights reserved.
5 *
6 * Based heavily on /sys/kern/imgact_aout.c which is:
7 * Copyright (c) 1993, David Greenman
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer
14 * in this position and unchanged.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: src/sys/compat/svr4/imgact_svr4.c,v 1.28 2008/01/13 14:44:01 attilio Exp $");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/exec.h>
39 #include <sys/imgact.h>
40 #include <sys/imgact_aout.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/mman.h>
44 #include <sys/mutex.h>
45 #include <sys/proc.h>
46 #include <sys/resourcevar.h>
47 #include <sys/vnode.h>
48
49 #include <vm/vm.h>
50 #include <vm/vm_kern.h>
51 #include <vm/vm_param.h>
52 #include <vm/pmap.h>
53 #include <vm/vm_map.h>
54 #include <vm/vm_extern.h>
55
56 #include <compat/svr4/svr4.h>
57
58 static int exec_svr4_imgact(struct image_params *iparams);
59
60 static int
61 exec_svr4_imgact(imgp)
62 struct image_params *imgp;
63 {
64 const struct exec *a_out = (const struct exec *) imgp->image_header;
65 struct vmspace *vmspace;
66 vm_offset_t vmaddr;
67 unsigned long virtual_offset, file_offset;
68 vm_offset_t buffer;
69 unsigned long bss_size;
70 int error;
71
72 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
73 return -1;
74
75 /*
76 * Set file/virtual offset based on a.out variant.
77 */
78 switch ((int)(a_out->a_magic & 0xffff)) {
79 case 0413:
80 virtual_offset = 0;
81 file_offset = 1024;
82 break;
83 case 0314:
84 virtual_offset = 4096;
85 file_offset = 0;
86 break;
87 default:
88 return (-1);
89 }
90 bss_size = round_page(a_out->a_bss);
91 #ifdef DEBUG
92 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n", (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
93 #endif
94
95 /*
96 * Check various fields in header for validity/bounds.
97 */
98 if (a_out->a_entry < virtual_offset ||
99 a_out->a_entry >= virtual_offset + a_out->a_text ||
100 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
101 return (-1);
102
103 /* text + data can't exceed file size */
104 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
105 return (EFAULT);
106 /*
107 * text/data/bss must not exceed limits
108 */
109 PROC_LOCK(imgp->proc);
110 if (a_out->a_text > maxtsiz ||
111 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
112 PROC_UNLOCK(imgp->proc);
113 return (ENOMEM);
114 }
115 PROC_UNLOCK(imgp->proc);
116
117 VOP_UNLOCK(imgp->vp, 0);
118
119 /*
120 * Destroy old process VM and create a new one (with a new stack)
121 */
122 error = exec_new_vmspace(imgp, &svr4_sysvec);
123 if (error)
124 goto fail;
125 vmspace = imgp->proc->p_vmspace;
126
127 /*
128 * Check if file_offset page aligned,.
129 * Currently we cannot handle misalinged file offsets,
130 * and so we read in the entire image (what a waste).
131 */
132 if (file_offset & PAGE_MASK) {
133 #ifdef DEBUG
134 printf("imgact: Non page aligned binary %lu\n", file_offset);
135 #endif
136 /*
137 * Map text+data+bss read/write/execute
138 */
139 vmaddr = virtual_offset;
140 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
141 a_out->a_text + a_out->a_data + bss_size, FALSE,
142 VM_PROT_ALL, VM_PROT_ALL, 0);
143 if (error)
144 goto fail;
145
146 error = vm_mmap(kernel_map, &buffer,
147 round_page(a_out->a_text + a_out->a_data + file_offset),
148 VM_PROT_READ, VM_PROT_READ, 0,
149 OBJT_VNODE, imgp->vp, trunc_page(file_offset));
150 if (error)
151 goto fail;
152
153 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
154 a_out->a_text + a_out->a_data);
155
156 vm_map_remove(kernel_map, buffer,
157 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
158
159 if (error)
160 goto fail;
161
162 /*
163 * remove write enable on the 'text' part
164 */
165 error = vm_map_protect(&vmspace->vm_map,
166 vmaddr,
167 vmaddr + a_out->a_text,
168 VM_PROT_EXECUTE|VM_PROT_READ,
169 TRUE);
170 if (error)
171 goto fail;
172 }
173 else {
174 #ifdef DEBUG
175 printf("imgact: Page aligned binary %lu\n", file_offset);
176 #endif
177 /*
178 * Map text+data read/execute
179 */
180 vmaddr = virtual_offset;
181 error = vm_mmap(&vmspace->vm_map, &vmaddr,
182 a_out->a_text + a_out->a_data,
183 VM_PROT_READ | VM_PROT_EXECUTE,
184 VM_PROT_ALL,
185 MAP_PRIVATE | MAP_FIXED,
186 OBJT_VNODE, imgp->vp, file_offset);
187 if (error)
188 goto fail;
189
190 #ifdef DEBUG
191 printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
192 (u_long)a_out->a_text + a_out->a_data);
193 #endif
194 /*
195 * allow read/write of data
196 */
197 error = vm_map_protect(&vmspace->vm_map,
198 vmaddr + a_out->a_text,
199 vmaddr + a_out->a_text + a_out->a_data,
200 VM_PROT_ALL,
201 FALSE);
202 if (error)
203 goto fail;
204
205 /*
206 * Allocate anon demand-zeroed area for uninitialized data
207 */
208 if (bss_size != 0) {
209 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
210 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
211 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
212 if (error)
213 goto fail;
214 #ifdef DEBUG
215 printf("imgact: bssaddr=%08lx, length=%08lx\n",
216 (u_long)vmaddr, bss_size);
217 #endif
218
219 }
220 }
221 /* Fill in process VM information */
222 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
223 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
224 vmspace->vm_taddr = (caddr_t)virtual_offset;
225 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
226
227 /* Fill in image_params */
228 imgp->interpreted = 0;
229 imgp->entry_addr = a_out->a_entry;
230
231 imgp->proc->p_sysent = &svr4_sysvec;
232 fail:
233 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
234 return (error);
235 }
236
237 /*
238 * Tell kern_execve.c about it, with a little help from the linker.
239 */
240 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
241 EXEC_SET(execsw_set, svr4_execsw);
242
243 Cache object: 0c41344d417462f60e735b483ba1b211
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