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: releng/6.3/sys/compat/svr4/imgact_svr4.c 144501 2005-04-01 20:00:11Z jhb $");
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 struct thread *td = curthread;
72
73 if (((a_out->a_magic >> 16) & 0xff) != 0x64)
74 return -1;
75
76 /*
77 * Set file/virtual offset based on a.out variant.
78 */
79 switch ((int)(a_out->a_magic & 0xffff)) {
80 case 0413:
81 virtual_offset = 0;
82 file_offset = 1024;
83 break;
84 case 0314:
85 virtual_offset = 4096;
86 file_offset = 0;
87 break;
88 default:
89 return (-1);
90 }
91 bss_size = round_page(a_out->a_bss);
92 #ifdef DEBUG
93 printf("imgact: text: %08lx, data: %08lx, bss: %08lx\n", (u_long)a_out->a_text, (u_long)a_out->a_data, bss_size);
94 #endif
95
96 /*
97 * Check various fields in header for validity/bounds.
98 */
99 if (a_out->a_entry < virtual_offset ||
100 a_out->a_entry >= virtual_offset + a_out->a_text ||
101 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
102 return (-1);
103
104 /* text + data can't exceed file size */
105 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
106 return (EFAULT);
107 /*
108 * text/data/bss must not exceed limits
109 */
110 PROC_LOCK(imgp->proc);
111 if (a_out->a_text > maxtsiz ||
112 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
113 PROC_UNLOCK(imgp->proc);
114 return (ENOMEM);
115 }
116 PROC_UNLOCK(imgp->proc);
117
118 VOP_UNLOCK(imgp->vp, 0, td);
119
120 /*
121 * Destroy old process VM and create a new one (with a new stack)
122 */
123 exec_new_vmspace(imgp, &svr4_sysvec);
124 vmspace = imgp->proc->p_vmspace;
125
126 /*
127 * Check if file_offset page aligned,.
128 * Currently we cannot handle misalinged 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,
148 OBJT_VNODE, imgp->vp, trunc_page(file_offset));
149 if (error)
150 goto fail;
151
152 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
153 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, imgp->vp, file_offset);
186 if (error)
187 goto fail;
188
189 #ifdef DEBUG
190 printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
191 (u_long)a_out->a_text + 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 }
220 /* Fill in process VM information */
221 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
222 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
223 vmspace->vm_taddr = (caddr_t)virtual_offset;
224 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
225
226 /* Fill in image_params */
227 imgp->interpreted = 0;
228 imgp->entry_addr = a_out->a_entry;
229
230 imgp->proc->p_sysent = &svr4_sysvec;
231 fail:
232 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY, td);
233 return (error);
234 }
235
236 /*
237 * Tell kern_execve.c about it, with a little help from the linker.
238 */
239 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
240 EXEC_SET(execsw_set, svr4_execsw);
241
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