1 /*-
2 * Copyright (c) 1994-1996 Søren Schmidt
3 * All rights reserved.
4 *
5 * Based heavily on /sys/kern/imgact_aout.c which is:
6 * Copyright (c) 1993, David Greenman
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer
13 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $FreeBSD: src/sys/i386/linux/imgact_linux.c,v 1.35.2.2 2001/11/03 01:41:08 ps Exp $
32 * $DragonFly: src/sys/emulation/linux/i386/imgact_linux.c,v 1.10 2006/12/28 21:24:02 dillon Exp $
33 */
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/resourcevar.h>
38 #include <sys/exec.h>
39 #include <sys/mman.h>
40 #include <sys/imgact.h>
41 #include <sys/imgact_aout.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/proc.h>
45 #include <sys/vnode.h>
46
47 #include <vm/vm.h>
48 #include <vm/vm_kern.h>
49 #include <vm/vm_param.h>
50 #include <vm/pmap.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_extern.h>
53
54 #include "linux.h"
55
56 static int exec_linux_imgact (struct image_params *iparams);
57
58 static int
59 exec_linux_imgact(struct image_params *imgp)
60 {
61 const struct exec *a_out = (const struct exec *) imgp->image_header;
62 struct vmspace *vmspace;
63 vm_offset_t vmaddr;
64 unsigned long virtual_offset, file_offset;
65 vm_offset_t buffer;
66 unsigned long bss_size;
67 int error;
68
69 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
70 return -1;
71
72 /*
73 * Set file/virtual offset based on a.out variant.
74 */
75 switch ((int)(a_out->a_magic & 0xffff)) {
76 case 0413:
77 virtual_offset = 0;
78 file_offset = 1024;
79 break;
80 case 0314:
81 virtual_offset = 4096;
82 file_offset = 0;
83 break;
84 default:
85 return (-1);
86 }
87 bss_size = round_page(a_out->a_bss);
88 #ifdef DEBUG
89 kprintf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
90 (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
91 #endif
92
93 /*
94 * Check various fields in header for validity/bounds.
95 */
96 if (a_out->a_entry < virtual_offset ||
97 a_out->a_entry >= virtual_offset + a_out->a_text ||
98 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
99 return (-1);
100
101 /* text + data can't exceed file size */
102 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
103 return (EFAULT);
104 /*
105 * text/data/bss must not exceed limits
106 */
107 if (a_out->a_text > maxtsiz ||
108 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
109 return (ENOMEM);
110
111 /*
112 * Destroy old process VM and create a new one (with a new stack)
113 */
114 exec_new_vmspace(imgp, NULL);
115 vmspace = imgp->proc->p_vmspace;
116
117 /*
118 * Check if file_offset page aligned,.
119 * Currently we cannot handle misalinged file offsets,
120 * and so we read in the entire image (what a waste).
121 */
122 if (file_offset & PAGE_MASK) {
123 #ifdef DEBUG
124 kprintf("imgact: Non page aligned binary %lu\n", file_offset);
125 #endif
126 /*
127 * Map text+data+bss read/write/execute
128 */
129 vmaddr = virtual_offset;
130 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
131 a_out->a_text + a_out->a_data + bss_size,
132 PAGE_SIZE,
133 FALSE, VM_MAPTYPE_NORMAL,
134 VM_PROT_ALL, VM_PROT_ALL, 0);
135 if (error)
136 return error;
137
138 error = vm_mmap(&kernel_map, &buffer,
139 round_page(a_out->a_text + a_out->a_data + file_offset),
140 VM_PROT_READ, VM_PROT_READ, 0,
141 (caddr_t) imgp->vp, trunc_page(file_offset));
142 if (error)
143 return error;
144
145 error = copyout((caddr_t)(void *)(uintptr_t)(buffer + file_offset),
146 (caddr_t)vmaddr, a_out->a_text + a_out->a_data);
147
148 vm_map_remove(&kernel_map, buffer,
149 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
150
151 if (error)
152 return error;
153
154 /*
155 * remove write enable on the 'text' part
156 */
157 error = vm_map_protect(&vmspace->vm_map,
158 vmaddr,
159 vmaddr + a_out->a_text,
160 VM_PROT_EXECUTE|VM_PROT_READ,
161 TRUE);
162 if (error)
163 return error;
164 }
165 else {
166 #ifdef DEBUG
167 kprintf("imgact: Page aligned binary %lu\n", file_offset);
168 #endif
169 /*
170 * Map text+data read/execute
171 */
172 vmaddr = virtual_offset;
173 error = vm_mmap(&vmspace->vm_map, &vmaddr,
174 a_out->a_text + a_out->a_data,
175 VM_PROT_READ | VM_PROT_EXECUTE,
176 VM_PROT_ALL,
177 MAP_PRIVATE | MAP_FIXED,
178 (caddr_t)imgp->vp, file_offset);
179 if (error)
180 return (error);
181
182 #ifdef DEBUG
183 kprintf("imgact: startaddr=%08lx, length=%08lx\n",
184 (u_long)vmaddr, a_out->a_text + a_out->a_data);
185 #endif
186 /*
187 * allow read/write of data
188 */
189 error = vm_map_protect(&vmspace->vm_map,
190 vmaddr + a_out->a_text,
191 vmaddr + a_out->a_text + a_out->a_data,
192 VM_PROT_ALL,
193 FALSE);
194 if (error)
195 return (error);
196
197 /*
198 * Allocate anon demand-zeroed area for uninitialized data
199 */
200 if (bss_size != 0) {
201 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
202 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
203 bss_size, PAGE_SIZE,
204 FALSE, VM_MAPTYPE_NORMAL,
205 VM_PROT_ALL, VM_PROT_ALL,
206 0);
207 if (error)
208 return (error);
209 #ifdef DEBUG
210 kprintf("imgact: bssaddr=%08lx, length=%08lx\n",
211 (u_long)vmaddr, bss_size);
212 #endif
213
214 }
215 /* Indicate that this file should not be modified */
216 imgp->vp->v_flag |= VTEXT;
217 }
218 /* Fill in process VM information */
219 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
220 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
221 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
222 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
223 (virtual_offset + a_out->a_text);
224
225 /* Fill in image_params */
226 imgp->interpreted = 0;
227 imgp->entry_addr = a_out->a_entry;
228
229 imgp->proc->p_sysent = &linux_sysvec;
230 return (0);
231 }
232
233 /*
234 * Tell kern_execve.c about it, with a little help from the linker.
235 */
236 static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
237 EXEC_SET(linuxaout, linux_execsw);
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