1/*-
2 * Copyright (c) 1994-1996 S�ren 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: head/sys/i386/linux/imgact_linux.c 144501 2005-04-01 20:00:11Z 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
57static int exec_linux_imgact(struct image_params *iparams);
58
59static int
60exec_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 struct thread *td = curthread;
69 int error;
70
71 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
72 return -1;
73
74 /*
75 * Set file/virtual offset based on a.out variant.
76 */
77 switch ((int)(a_out->a_magic & 0xffff)) {
78 case 0413:
79 virtual_offset = 0;
80 file_offset = 1024;
81 break;
82 case 0314:
83 virtual_offset = 4096;
84 file_offset = 0;
85 break;
86 default:
87 return (-1);
88 }
89 bss_size = round_page(a_out->a_bss);
90#ifdef DEBUG
91 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
92 (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, td);
118
119 /*
120 * Destroy old process VM and create a new one (with a new stack)
121 */
122 exec_new_vmspace(imgp, &linux_sysvec);
123 vmspace = imgp->proc->p_vmspace;
124
125 /*
126 * Check if file_offset page aligned,.
127 * Currently we cannot handle misalinged file offsets,
128 * and so we read in the entire image (what a waste).
129 */
130 if (file_offset & PAGE_MASK) {
131#ifdef DEBUG
132 printf("imgact: Non page aligned binary %lu\n", file_offset);
133#endif
134 /*
135 * Map text+data+bss read/write/execute
136 */
137 vmaddr = virtual_offset;
138 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
139 a_out->a_text + a_out->a_data + bss_size, FALSE,
140 VM_PROT_ALL, VM_PROT_ALL, 0);
141 if (error)
142 goto fail;
143
144 error = vm_mmap(kernel_map, &buffer,
145 round_page(a_out->a_text + a_out->a_data + file_offset),
146 VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE,
147 imgp->vp, trunc_page(file_offset));
148 if (error)
149 goto fail;
150
151 error = copyout((void *)(uintptr_t)(buffer + file_offset),
152 (void *)vmaddr, a_out->a_text + a_out->a_data);
153
154 vm_map_remove(kernel_map, buffer,
155 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
156
157 if (error)
158 goto fail;
159
160 /*
161 * remove write enable on the 'text' part
162 */
163 error = vm_map_protect(&vmspace->vm_map,
164 vmaddr,
165 vmaddr + a_out->a_text,
166 VM_PROT_EXECUTE|VM_PROT_READ,
167 TRUE);
168 if (error)
169 goto fail;
170 }
171 else {
172#ifdef DEBUG
173 printf("imgact: Page aligned binary %lu\n", file_offset);
174#endif
175 /*
176 * Map text+data read/execute
177 */
178 vmaddr = virtual_offset;
179 error = vm_mmap(&vmspace->vm_map, &vmaddr,
180 a_out->a_text + a_out->a_data,
181 VM_PROT_READ | VM_PROT_EXECUTE,
182 VM_PROT_ALL,
183 MAP_PRIVATE | MAP_FIXED,
184 OBJT_VNODE,
185 imgp->vp, file_offset);
186 if (error)
187 goto fail;
188
189#ifdef DEBUG
190 printf("imgact: startaddr=%08lx, length=%08lx\n",
191 (u_long)vmaddr, (u_long)a_out->a_text + (u_long)a_out->a_data);
192#endif
193 /*
194 * allow read/write of data
195 */
196 error = vm_map_protect(&vmspace->vm_map,
197 vmaddr + a_out->a_text,
198 vmaddr + a_out->a_text + a_out->a_data,
199 VM_PROT_ALL,
200 FALSE);
201 if (error)
202 goto fail;
203
204 /*
205 * Allocate anon demand-zeroed area for uninitialized data
206 */
207 if (bss_size != 0) {
208 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
209 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
210 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
211 if (error)
212 goto fail;
213#ifdef DEBUG
214 printf("imgact: bssaddr=%08lx, length=%08lx\n",
215 (u_long)vmaddr, bss_size);
216#endif
217
218 }
219 /* Indicate that this file should not be modified */
220 mp_fixme("Unlocked v_flag access");
221 imgp->vp->v_vflag |= VV_TEXT;
222 }
223 /* Fill in process VM information */
224 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
225 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
226 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
227 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
228 (virtual_offset + a_out->a_text);
229
230 /* Fill in image_params */
231 imgp->interpreted = 0;
232 imgp->entry_addr = a_out->a_entry;
233
234 imgp->proc->p_sysent = &linux_sysvec;
235
236fail:
237 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
238 return (error);
239}
240
241/*
242 * Tell kern_execve.c about it, with a little help from the linker.
243 */
244static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
245EXEC_SET(linuxaout, linux_execsw);
2 * Copyright (c) 1994-1996 S�ren 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: head/sys/i386/linux/imgact_linux.c 144501 2005-04-01 20:00:11Z 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
57static int exec_linux_imgact(struct image_params *iparams);
58
59static int
60exec_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 struct thread *td = curthread;
69 int error;
70
71 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
72 return -1;
73
74 /*
75 * Set file/virtual offset based on a.out variant.
76 */
77 switch ((int)(a_out->a_magic & 0xffff)) {
78 case 0413:
79 virtual_offset = 0;
80 file_offset = 1024;
81 break;
82 case 0314:
83 virtual_offset = 4096;
84 file_offset = 0;
85 break;
86 default:
87 return (-1);
88 }
89 bss_size = round_page(a_out->a_bss);
90#ifdef DEBUG
91 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n",
92 (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, td);
118
119 /*
120 * Destroy old process VM and create a new one (with a new stack)
121 */
122 exec_new_vmspace(imgp, &linux_sysvec);
123 vmspace = imgp->proc->p_vmspace;
124
125 /*
126 * Check if file_offset page aligned,.
127 * Currently we cannot handle misalinged file offsets,
128 * and so we read in the entire image (what a waste).
129 */
130 if (file_offset & PAGE_MASK) {
131#ifdef DEBUG
132 printf("imgact: Non page aligned binary %lu\n", file_offset);
133#endif
134 /*
135 * Map text+data+bss read/write/execute
136 */
137 vmaddr = virtual_offset;
138 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
139 a_out->a_text + a_out->a_data + bss_size, FALSE,
140 VM_PROT_ALL, VM_PROT_ALL, 0);
141 if (error)
142 goto fail;
143
144 error = vm_mmap(kernel_map, &buffer,
145 round_page(a_out->a_text + a_out->a_data + file_offset),
146 VM_PROT_READ, VM_PROT_READ, 0, OBJT_VNODE,
147 imgp->vp, trunc_page(file_offset));
148 if (error)
149 goto fail;
150
151 error = copyout((void *)(uintptr_t)(buffer + file_offset),
152 (void *)vmaddr, a_out->a_text + a_out->a_data);
153
154 vm_map_remove(kernel_map, buffer,
155 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
156
157 if (error)
158 goto fail;
159
160 /*
161 * remove write enable on the 'text' part
162 */
163 error = vm_map_protect(&vmspace->vm_map,
164 vmaddr,
165 vmaddr + a_out->a_text,
166 VM_PROT_EXECUTE|VM_PROT_READ,
167 TRUE);
168 if (error)
169 goto fail;
170 }
171 else {
172#ifdef DEBUG
173 printf("imgact: Page aligned binary %lu\n", file_offset);
174#endif
175 /*
176 * Map text+data read/execute
177 */
178 vmaddr = virtual_offset;
179 error = vm_mmap(&vmspace->vm_map, &vmaddr,
180 a_out->a_text + a_out->a_data,
181 VM_PROT_READ | VM_PROT_EXECUTE,
182 VM_PROT_ALL,
183 MAP_PRIVATE | MAP_FIXED,
184 OBJT_VNODE,
185 imgp->vp, file_offset);
186 if (error)
187 goto fail;
188
189#ifdef DEBUG
190 printf("imgact: startaddr=%08lx, length=%08lx\n",
191 (u_long)vmaddr, (u_long)a_out->a_text + (u_long)a_out->a_data);
192#endif
193 /*
194 * allow read/write of data
195 */
196 error = vm_map_protect(&vmspace->vm_map,
197 vmaddr + a_out->a_text,
198 vmaddr + a_out->a_text + a_out->a_data,
199 VM_PROT_ALL,
200 FALSE);
201 if (error)
202 goto fail;
203
204 /*
205 * Allocate anon demand-zeroed area for uninitialized data
206 */
207 if (bss_size != 0) {
208 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
209 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
210 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
211 if (error)
212 goto fail;
213#ifdef DEBUG
214 printf("imgact: bssaddr=%08lx, length=%08lx\n",
215 (u_long)vmaddr, bss_size);
216#endif
217
218 }
219 /* Indicate that this file should not be modified */
220 mp_fixme("Unlocked v_flag access");
221 imgp->vp->v_vflag |= VV_TEXT;
222 }
223 /* Fill in process VM information */
224 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
225 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
226 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)virtual_offset;
227 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)
228 (virtual_offset + a_out->a_text);
229
230 /* Fill in image_params */
231 imgp->interpreted = 0;
232 imgp->entry_addr = a_out->a_entry;
233
234 imgp->proc->p_sysent = &linux_sysvec;
235
236fail:
237 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
238 return (error);
239}
240
241/*
242 * Tell kern_execve.c about it, with a little help from the linker.
243 */
244static struct execsw linux_execsw = { exec_linux_imgact, "linux a.out" };
245EXEC_SET(linuxaout, linux_execsw);