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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/8.1/sys/i386/linux/imgact_linux.c 199583 2009-11-20 15:27:52Z jhb $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/exec.h>
38 #include <sys/imgact.h>
39 #include <sys/imgact_aout.h>
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/mman.h>
43 #include <sys/mutex.h>
44 #include <sys/proc.h>
45 #include <sys/resourcevar.h>
46 #include <sys/vnode.h>
47
48 #include <vm/vm.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_param.h>
51 #include <vm/pmap.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_extern.h>
54
55 #include <i386/linux/linux.h>
56
57 static int exec_linux_imgact(struct image_params *iparams);
58
59 static int
60 exec_linux_imgact(struct image_params *imgp)
61 {
62 const struct exec *a_out = (const struct exec *) imgp->image_header;
63 struct vmspace *vmspace;
64 vm_offset_t vmaddr;
65 unsigned long virtual_offset, file_offset;
66 vm_offset_t buffer;
67 unsigned long bss_size;
68 int error;
69
70 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
71 return -1;
72
73 /*
74 * Set file/virtual offset based on a.out variant.
75 */
76 switch ((int)(a_out->a_magic & 0xffff)) {
77 case 0413:
78 virtual_offset = 0;
79 file_offset = 1024;
80 break;
81 case 0314:
82 virtual_offset = 4096;
83 file_offset = 0;
84 break;
85 default:
86 return (-1);
87 }
88 bss_size = round_page(a_out->a_bss);
89 #ifdef DEBUG
90 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
91 (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
92 #endif
93
94 /*
95 * Check various fields in header for validity/bounds.
96 */
97 if (a_out->a_entry < virtual_offset ||
98 a_out->a_entry >= virtual_offset + a_out->a_text ||
99 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
100 return (-1);
101
102 /* text + data can't exceed file size */
103 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
104 return (EFAULT);
105 /*
106 * text/data/bss must not exceed limits
107 */
108 PROC_LOCK(imgp->proc);
109 if (a_out->a_text > maxtsiz ||
110 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
111 PROC_UNLOCK(imgp->proc);
112 return (ENOMEM);
113 }
114 PROC_UNLOCK(imgp->proc);
115
116 VOP_UNLOCK(imgp->vp, 0);
117
118 /*
119 * Destroy old process VM and create a new one (with a new stack)
120 */
121 error = exec_new_vmspace(imgp, &linux_sysvec);
122 if (error)
123 goto fail;
124 vmspace = imgp->proc->p_vmspace;
125
126 /*
127 * Check if file_offset page aligned,.
128 * Currently we cannot handle misaligned file offsets,
129 * and so we read in the entire image (what a waste).
130 */
131 if (file_offset & PAGE_MASK) {
132 #ifdef DEBUG
133 printf("imgact: Non page aligned binary %lu\n", file_offset);
134 #endif
135 /*
136 * Map text+data+bss read/write/execute
137 */
138 vmaddr = virtual_offset;
139 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
140 a_out->a_text + a_out->a_data + bss_size, FALSE,
141 VM_PROT_ALL, VM_PROT_ALL, 0);
142 if (error)
143 goto fail;
144
145 error = vm_mmap(kernel_map, &buffer,
146 round_page(a_out->a_text + a_out->a_data + file_offset),
147 VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE,
148 imgp->vp, trunc_page(file_offset));
149 if (error)
150 goto fail;
151
152 error = copyout((void *)(uintptr_t)(buffer + file_offset),
153 (void *)vmaddr, a_out->a_text + a_out->a_data);
154
155 vm_map_remove(kernel_map, buffer,
156 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
157
158 if (error)
159 goto fail;
160
161 /*
162 * remove write enable on the 'text' part
163 */
164 error = vm_map_protect(&vmspace->vm_map,
165 vmaddr,
166 vmaddr + a_out->a_text,
167 VM_PROT_EXECUTE|VM_PROT_READ,
168 TRUE);
169 if (error)
170 goto fail;
171 }
172 else {
173 #ifdef DEBUG
174 printf("imgact: Page aligned binary %lu\n", file_offset);
175 #endif
176 /*
177 * Map text+data read/execute
178 */
179 vmaddr = virtual_offset;
180 error = vm_mmap(&vmspace->vm_map, &vmaddr,
181 a_out->a_text + a_out->a_data,
182 VM_PROT_READ | VM_PROT_EXECUTE,
183 VM_PROT_ALL,
184 MAP_PRIVATE | MAP_FIXED,
185 OBJT_VNODE,
186 imgp->vp, file_offset);
187 if (error)
188 goto fail;
189
190 #ifdef DEBUG
191 printf("imgact: startaddr=%08lx, length=%08lx\n",
192 (u_long)vmaddr, (u_long)a_out->a_text + (u_long)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 /* Indicate that this file should not be modified */
221 mp_fixme("Unlocked v_flag access");
222 imgp->vp->v_vflag |= VV_TEXT;
223 }
224 /* Fill in process VM information */
225 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
226 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
227 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
228 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
229 (virtual_offset + a_out->a_text);
230
231 /* Fill in image_params */
232 imgp->interpreted = 0;
233 imgp->entry_addr = a_out->a_entry;
234
235 imgp->proc->p_sysent = &linux_sysvec;
236
237 fail:
238 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
239 return (error);
240 }
241
242 /*
243 * Tell kern_execve.c about it, with a little help from the linker.
244 */
245 static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
246 EXEC_SET(linuxaout, linux_execsw);
Cache object: b11dcd0f08044d9b0197489bccf5570c
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