1/*-
2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994-1996 S�ren 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: head/sys/compat/svr4/imgact_svr4.c 220373 2011-04-05 20:23:59Z trasz $");
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/racct.h>
47#include <sys/resourcevar.h>
48#include <sys/vnode.h>
49
50#include <vm/vm.h>
51#include <vm/vm_kern.h>
52#include <vm/vm_param.h>
53#include <vm/pmap.h>
54#include <vm/vm_map.h>
55#include <vm/vm_extern.h>
56
57#include <compat/svr4/svr4.h>
58
59static int exec_svr4_imgact(struct image_params *iparams);
60
61static int
62exec_svr4_imgact(imgp)
63 struct image_params *imgp;
64{
65 const struct exec *a_out = (const struct exec *) imgp->image_header;
66 struct vmspace *vmspace;
67 vm_offset_t vmaddr;
68 unsigned long virtual_offset, file_offset;
69 vm_offset_t buffer;
70 unsigned long bss_size;
71 int error;
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 racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {;
114 PROC_UNLOCK(imgp->proc);
115 return (ENOMEM);
116 }
117 PROC_UNLOCK(imgp->proc);
118
119 VOP_UNLOCK(imgp->vp, 0);
120
121 /*
122 * Destroy old process VM and create a new one (with a new stack)
123 */
124 error = exec_new_vmspace(imgp, &svr4_sysvec);
125 if (error)
126 goto fail;
127 vmspace = imgp->proc->p_vmspace;
128
129 /*
130 * Check if file_offset page aligned,.
131 * Currently we cannot handle misalinged file offsets,
132 * and so we read in the entire image (what a waste).
133 */
134 if (file_offset & PAGE_MASK) {
135#ifdef DEBUG
136 printf("imgact: Non page aligned binary %lu\n", file_offset);
137#endif
138 /*
139 * Map text+data+bss read/write/execute
140 */
141 vmaddr = virtual_offset;
142 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
143 a_out->a_text + a_out->a_data + bss_size, FALSE,
144 VM_PROT_ALL, VM_PROT_ALL, 0);
145 if (error)
146 goto fail;
147
148 error = vm_mmap(kernel_map, &buffer,
149 round_page(a_out->a_text + a_out->a_data + file_offset),
150 VM_PROT_READ, VM_PROT_READ, 0,
151 OBJT_VNODE, imgp->vp, trunc_page(file_offset));
152 if (error)
153 goto fail;
154
155 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
156 a_out->a_text + a_out->a_data);
157
158 vm_map_remove(kernel_map, buffer,
159 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
160
161 if (error)
162 goto fail;
163
164 /*
165 * remove write enable on the 'text' part
166 */
167 error = vm_map_protect(&vmspace->vm_map,
168 vmaddr,
169 vmaddr + a_out->a_text,
170 VM_PROT_EXECUTE|VM_PROT_READ,
171 TRUE);
172 if (error)
173 goto fail;
174 }
175 else {
176#ifdef DEBUG
177 printf("imgact: Page aligned binary %lu\n", file_offset);
178#endif
179 /*
180 * Map text+data read/execute
181 */
182 vmaddr = virtual_offset;
183 error = vm_mmap(&vmspace->vm_map, &vmaddr,
184 a_out->a_text + a_out->a_data,
185 VM_PROT_READ | VM_PROT_EXECUTE,
186 VM_PROT_ALL,
187 MAP_PRIVATE | MAP_FIXED,
188 OBJT_VNODE, imgp->vp, file_offset);
189 if (error)
190 goto fail;
191
192#ifdef DEBUG
193 printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
194 (u_long)a_out->a_text + a_out->a_data);
195#endif
196 /*
197 * allow read/write of data
198 */
199 error = vm_map_protect(&vmspace->vm_map,
200 vmaddr + a_out->a_text,
201 vmaddr + a_out->a_text + a_out->a_data,
202 VM_PROT_ALL,
203 FALSE);
204 if (error)
205 goto fail;
206
207 /*
208 * Allocate anon demand-zeroed area for uninitialized data
209 */
210 if (bss_size != 0) {
211 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
212 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
213 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
214 if (error)
215 goto fail;
216#ifdef DEBUG
217 printf("imgact: bssaddr=%08lx, length=%08lx\n",
218 (u_long)vmaddr, bss_size);
219#endif
220
221 }
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)virtual_offset;
227 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
228
229 /* Fill in image_params */
230 imgp->interpreted = 0;
231 imgp->entry_addr = a_out->a_entry;
232
233 imgp->proc->p_sysent = &svr4_sysvec;
234fail:
235 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
236 return (error);
237}
238
239/*
240 * Tell kern_execve.c about it, with a little help from the linker.
241 */
242struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
243EXEC_SET(execsw_set, svr4_execsw);
244
2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994-1996 S�ren 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: head/sys/compat/svr4/imgact_svr4.c 220373 2011-04-05 20:23:59Z trasz $");
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/racct.h>
47#include <sys/resourcevar.h>
48#include <sys/vnode.h>
49
50#include <vm/vm.h>
51#include <vm/vm_kern.h>
52#include <vm/vm_param.h>
53#include <vm/pmap.h>
54#include <vm/vm_map.h>
55#include <vm/vm_extern.h>
56
57#include <compat/svr4/svr4.h>
58
59static int exec_svr4_imgact(struct image_params *iparams);
60
61static int
62exec_svr4_imgact(imgp)
63 struct image_params *imgp;
64{
65 const struct exec *a_out = (const struct exec *) imgp->image_header;
66 struct vmspace *vmspace;
67 vm_offset_t vmaddr;
68 unsigned long virtual_offset, file_offset;
69 vm_offset_t buffer;
70 unsigned long bss_size;
71 int error;
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 racct_set(imgp->proc, RACCT_DATA, a_out->a_data + bss_size) != 0) {;
114 PROC_UNLOCK(imgp->proc);
115 return (ENOMEM);
116 }
117 PROC_UNLOCK(imgp->proc);
118
119 VOP_UNLOCK(imgp->vp, 0);
120
121 /*
122 * Destroy old process VM and create a new one (with a new stack)
123 */
124 error = exec_new_vmspace(imgp, &svr4_sysvec);
125 if (error)
126 goto fail;
127 vmspace = imgp->proc->p_vmspace;
128
129 /*
130 * Check if file_offset page aligned,.
131 * Currently we cannot handle misalinged file offsets,
132 * and so we read in the entire image (what a waste).
133 */
134 if (file_offset & PAGE_MASK) {
135#ifdef DEBUG
136 printf("imgact: Non page aligned binary %lu\n", file_offset);
137#endif
138 /*
139 * Map text+data+bss read/write/execute
140 */
141 vmaddr = virtual_offset;
142 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
143 a_out->a_text + a_out->a_data + bss_size, FALSE,
144 VM_PROT_ALL, VM_PROT_ALL, 0);
145 if (error)
146 goto fail;
147
148 error = vm_mmap(kernel_map, &buffer,
149 round_page(a_out->a_text + a_out->a_data + file_offset),
150 VM_PROT_READ, VM_PROT_READ, 0,
151 OBJT_VNODE, imgp->vp, trunc_page(file_offset));
152 if (error)
153 goto fail;
154
155 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr,
156 a_out->a_text + a_out->a_data);
157
158 vm_map_remove(kernel_map, buffer,
159 buffer + round_page(a_out->a_text + a_out->a_data + file_offset));
160
161 if (error)
162 goto fail;
163
164 /*
165 * remove write enable on the 'text' part
166 */
167 error = vm_map_protect(&vmspace->vm_map,
168 vmaddr,
169 vmaddr + a_out->a_text,
170 VM_PROT_EXECUTE|VM_PROT_READ,
171 TRUE);
172 if (error)
173 goto fail;
174 }
175 else {
176#ifdef DEBUG
177 printf("imgact: Page aligned binary %lu\n", file_offset);
178#endif
179 /*
180 * Map text+data read/execute
181 */
182 vmaddr = virtual_offset;
183 error = vm_mmap(&vmspace->vm_map, &vmaddr,
184 a_out->a_text + a_out->a_data,
185 VM_PROT_READ | VM_PROT_EXECUTE,
186 VM_PROT_ALL,
187 MAP_PRIVATE | MAP_FIXED,
188 OBJT_VNODE, imgp->vp, file_offset);
189 if (error)
190 goto fail;
191
192#ifdef DEBUG
193 printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
194 (u_long)a_out->a_text + a_out->a_data);
195#endif
196 /*
197 * allow read/write of data
198 */
199 error = vm_map_protect(&vmspace->vm_map,
200 vmaddr + a_out->a_text,
201 vmaddr + a_out->a_text + a_out->a_data,
202 VM_PROT_ALL,
203 FALSE);
204 if (error)
205 goto fail;
206
207 /*
208 * Allocate anon demand-zeroed area for uninitialized data
209 */
210 if (bss_size != 0) {
211 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
212 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
213 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
214 if (error)
215 goto fail;
216#ifdef DEBUG
217 printf("imgact: bssaddr=%08lx, length=%08lx\n",
218 (u_long)vmaddr, bss_size);
219#endif
220
221 }
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)virtual_offset;
227 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
228
229 /* Fill in image_params */
230 imgp->interpreted = 0;
231 imgp->entry_addr = a_out->a_entry;
232
233 imgp->proc->p_sysent = &svr4_sysvec;
234fail:
235 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
236 return (error);
237}
238
239/*
240 * Tell kern_execve.c about it, with a little help from the linker.
241 */
242struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
243EXEC_SET(execsw_set, svr4_execsw);
244