1 /*
2 * Copyright (c) 1993, David Greenman
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/5.3/sys/kern/imgact_aout.c 136588 2004-10-16 08:43:07Z cvs2svn $");
29
30 #include <sys/param.h>
31 #include <sys/exec.h>
32 #include <sys/imgact.h>
33 #include <sys/imgact_aout.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/malloc.h>
37 #include <sys/mutex.h>
38 #include <sys/proc.h>
39 #include <sys/resourcevar.h>
40 #include <sys/signalvar.h>
41 #include <sys/syscall.h>
42 #include <sys/sysent.h>
43 #include <sys/systm.h>
44 #include <sys/vnode.h>
45 #include <sys/user.h>
46
47 #include <machine/frame.h>
48 #include <machine/md_var.h>
49
50 #include <vm/vm.h>
51 #include <vm/pmap.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_object.h>
54 #include <vm/vm_param.h>
55
56 static int exec_aout_imgact(struct image_params *imgp);
57 static int aout_fixup(register_t **stack_base, struct image_params *imgp);
58
59 struct sysentvec aout_sysvec = {
60 SYS_MAXSYSCALL,
61 sysent,
62 0,
63 0,
64 NULL,
65 0,
66 NULL,
67 NULL,
68 aout_fixup,
69 sendsig,
70 sigcode,
71 &szsigcode,
72 NULL,
73 "FreeBSD a.out",
74 aout_coredump,
75 NULL,
76 MINSIGSTKSZ,
77 PAGE_SIZE,
78 VM_MIN_ADDRESS,
79 VM_MAXUSER_ADDRESS,
80 USRSTACK,
81 PS_STRINGS,
82 VM_PROT_ALL,
83 exec_copyout_strings,
84 exec_setregs,
85 NULL
86 };
87
88 static int
89 aout_fixup(stack_base, imgp)
90 register_t **stack_base;
91 struct image_params *imgp;
92 {
93
94 return (suword(--(*stack_base), imgp->argc));
95 }
96
97 static int
98 exec_aout_imgact(imgp)
99 struct image_params *imgp;
100 {
101 const struct exec *a_out = (const struct exec *) imgp->image_header;
102 struct vmspace *vmspace;
103 struct vnode *vp;
104 vm_map_t map;
105 vm_object_t object;
106 vm_offset_t text_end, data_end;
107 unsigned long virtual_offset;
108 unsigned long file_offset;
109 unsigned long bss_size;
110 int error;
111
112 GIANT_REQUIRED;
113
114 /*
115 * Linux and *BSD binaries look very much alike,
116 * only the machine id is different:
117 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
118 * NetBSD is in network byte order.. ugh.
119 */
120 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
121 ((a_out->a_magic >> 16) & 0xff) != 0 &&
122 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
123 return -1;
124
125 /*
126 * Set file/virtual offset based on a.out variant.
127 * We do two cases: host byte order and network byte order
128 * (for NetBSD compatibility)
129 */
130 switch ((int)(a_out->a_magic & 0xffff)) {
131 case ZMAGIC:
132 virtual_offset = 0;
133 if (a_out->a_text) {
134 file_offset = PAGE_SIZE;
135 } else {
136 /* Bill's "screwball mode" */
137 file_offset = 0;
138 }
139 break;
140 case QMAGIC:
141 virtual_offset = PAGE_SIZE;
142 file_offset = 0;
143 /* Pass PS_STRINGS for BSD/OS binaries only. */
144 if (N_GETMID(*a_out) == MID_ZERO)
145 imgp->ps_strings = aout_sysvec.sv_psstrings;
146 break;
147 default:
148 /* NetBSD compatibility */
149 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
150 case ZMAGIC:
151 case QMAGIC:
152 virtual_offset = PAGE_SIZE;
153 file_offset = 0;
154 break;
155 default:
156 return (-1);
157 }
158 }
159
160 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
161
162 /*
163 * Check various fields in header for validity/bounds.
164 */
165 if (/* entry point must lay with text region */
166 a_out->a_entry < virtual_offset ||
167 a_out->a_entry >= virtual_offset + a_out->a_text ||
168
169 /* text and data size must each be page rounded */
170 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
171 return (-1);
172
173 /* text + data can't exceed file size */
174 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
175 return (EFAULT);
176
177 /*
178 * text/data/bss must not exceed limits
179 */
180 PROC_LOCK(imgp->proc);
181 if (/* text can't exceed maximum text size */
182 a_out->a_text > maxtsiz ||
183
184 /* data + bss can't exceed rlimit */
185 a_out->a_data + bss_size > lim_cur(imgp->proc, RLIMIT_DATA)) {
186 PROC_UNLOCK(imgp->proc);
187 return (ENOMEM);
188 }
189 PROC_UNLOCK(imgp->proc);
190
191 /* copy in arguments and/or environment from old process */
192 error = exec_extract_strings(imgp);
193 if (error)
194 return (error);
195
196 /*
197 * Destroy old process VM and create a new one (with a new stack)
198 */
199 exec_new_vmspace(imgp, &aout_sysvec);
200
201 /*
202 * The vm space can be changed by exec_new_vmspace
203 */
204 vmspace = imgp->proc->p_vmspace;
205
206 vp = imgp->vp;
207 object = imgp->object;
208 map = &vmspace->vm_map;
209 vm_map_lock(map);
210 vm_object_reference(object);
211
212 text_end = virtual_offset + a_out->a_text;
213 error = vm_map_insert(map, object,
214 file_offset,
215 virtual_offset, text_end,
216 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
217 MAP_COPY_ON_WRITE | MAP_PREFAULT);
218 if (error) {
219 vm_map_unlock(map);
220 return (error);
221 }
222 data_end = text_end + a_out->a_data;
223 if (a_out->a_data) {
224 vm_object_reference(object);
225 error = vm_map_insert(map, object,
226 file_offset + a_out->a_text,
227 text_end, data_end,
228 VM_PROT_ALL, VM_PROT_ALL,
229 MAP_COPY_ON_WRITE | MAP_PREFAULT);
230 if (error) {
231 vm_map_unlock(map);
232 return (error);
233 }
234 }
235
236 if (bss_size) {
237 error = vm_map_insert(map, NULL, 0,
238 data_end, data_end + bss_size,
239 VM_PROT_ALL, VM_PROT_ALL, 0);
240 if (error) {
241 vm_map_unlock(map);
242 return (error);
243 }
244 }
245 vm_map_unlock(map);
246
247 /* Fill in process VM information */
248 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
249 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
250 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
251 vmspace->vm_daddr = (caddr_t) (uintptr_t)
252 (virtual_offset + a_out->a_text);
253
254 /* Fill in image_params */
255 imgp->interpreted = 0;
256 imgp->entry_addr = a_out->a_entry;
257
258 imgp->proc->p_sysent = &aout_sysvec;
259
260 return (0);
261 }
262
263 /*
264 * Dump core, into a file named as described in the comments for
265 * expand_name(), unless the process was setuid/setgid.
266 */
267 int
268 aout_coredump(td, vp, limit)
269 register struct thread *td;
270 register struct vnode *vp;
271 off_t limit;
272 {
273 struct proc *p = td->td_proc;
274 register struct ucred *cred = td->td_ucred;
275 register struct vmspace *vm = p->p_vmspace;
276 char *tempuser;
277 int error;
278
279 if (ctob((uarea_pages + kstack_pages)
280 + vm->vm_dsize + vm->vm_ssize) >= limit)
281 return (EFAULT);
282 tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
283 M_WAITOK | M_ZERO);
284 if (tempuser == NULL)
285 return (ENOMEM);
286 PROC_LOCK(p);
287 fill_kinfo_proc(p, &p->p_uarea->u_kproc);
288 PROC_UNLOCK(p);
289 bcopy(p->p_uarea, tempuser, sizeof(struct user));
290 bcopy(td->td_frame,
291 tempuser + ctob(uarea_pages) +
292 ((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
293 sizeof(struct trapframe));
294 error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
295 ctob(uarea_pages + kstack_pages),
296 (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
297 (int *)NULL, td);
298 free(tempuser, M_TEMP);
299 if (error == 0)
300 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
301 (int)ctob(vm->vm_dsize),
302 (off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
303 IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
304 if (error == 0)
305 error = vn_rdwr_inchunks(UIO_WRITE, vp,
306 (caddr_t)trunc_page(p->p_sysent->sv_usrstack -
307 ctob(vm->vm_ssize)), round_page(ctob(vm->vm_ssize)),
308 (off_t)ctob(uarea_pages + kstack_pages) +
309 ctob(vm->vm_dsize), UIO_USERSPACE,
310 IO_UNIT | IO_DIRECT, cred, NOCRED, NULL, td);
311 return (error);
312 }
313
314 /*
315 * Tell kern_execve.c about it, with a little help from the linker.
316 */
317 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
318 EXEC_SET(aout, aout_execsw);
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