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("$FreeBSD$");
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
59 static int exec_svr4_imgact(struct image_params *iparams);
60
61 static int
62 exec_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 unsigned long bss_size;
70 ssize_t aresid;
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_proc(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, 0, VMFS_NO_SPACE,
144 VM_PROT_ALL, VM_PROT_ALL, 0);
145 if (error)
146 goto fail;
147
148 error = vn_rdwr(UIO_READ, imgp->vp, (void *)vmaddr, file_offset,
149 a_out->a_text + a_out->a_data, UIO_USERSPACE, 0,
150 curthread->td_ucred, NOCRED, &aresid, curthread);
151 if (error != 0)
152 goto fail;
153 if (aresid != 0) {
154 error = ENOEXEC;
155 goto fail;
156 }
157
158 /*
159 * remove write enable on the 'text' part
160 */
161 error = vm_map_protect(&vmspace->vm_map,
162 vmaddr,
163 vmaddr + a_out->a_text,
164 VM_PROT_EXECUTE|VM_PROT_READ,
165 TRUE);
166 if (error)
167 goto fail;
168 }
169 else {
170 #ifdef DEBUG
171 printf("imgact: Page aligned binary %lu\n", file_offset);
172 #endif
173 /*
174 * Map text+data read/execute
175 */
176 vmaddr = virtual_offset;
177 error = vm_mmap(&vmspace->vm_map, &vmaddr,
178 a_out->a_text + a_out->a_data,
179 VM_PROT_READ | VM_PROT_EXECUTE,
180 VM_PROT_ALL,
181 MAP_PRIVATE | MAP_FIXED,
182 OBJT_VNODE, imgp->vp, file_offset);
183 if (error)
184 goto fail;
185
186 #ifdef DEBUG
187 printf("imgact: startaddr=%08lx, length=%08lx\n", (u_long)vmaddr,
188 (u_long)a_out->a_text + a_out->a_data);
189 #endif
190 /*
191 * allow read/write of data
192 */
193 error = vm_map_protect(&vmspace->vm_map,
194 vmaddr + a_out->a_text,
195 vmaddr + a_out->a_text + a_out->a_data,
196 VM_PROT_ALL,
197 FALSE);
198 if (error)
199 goto fail;
200
201 /*
202 * Allocate anon demand-zeroed area for uninitialized data
203 */
204 if (bss_size != 0) {
205 vmaddr = virtual_offset + a_out->a_text + a_out->a_data;
206 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr,
207 bss_size, 0, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0);
208 if (error)
209 goto fail;
210 #ifdef DEBUG
211 printf("imgact: bssaddr=%08lx, length=%08lx\n",
212 (u_long)vmaddr, bss_size);
213 #endif
214
215 }
216 }
217 /* Fill in process VM information */
218 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT;
219 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT;
220 vmspace->vm_taddr = (caddr_t)virtual_offset;
221 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text;
222
223 /* Fill in image_params */
224 imgp->interpreted = 0;
225 imgp->entry_addr = a_out->a_entry;
226
227 imgp->proc->p_sysent = &svr4_sysvec;
228 fail:
229 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
230 return (error);
231 }
232
233 /*
234 * Tell kern_execve.c about it, with a little help from the linker.
235 */
236 struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" };
237 EXEC_SET(execsw_set, svr4_execsw);
238
Cache object: 70a4a20adcedc5b0e7610976a89e13e9
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