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 *
| 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 * $FreeBSD: head/sys/kern/imgact_aout.c 103181 2002-09-10 11:57:02Z bde $
| 26 * $FreeBSD: head/sys/kern/imgact_aout.c 103767 2002-09-21 22:07:17Z jake $
|
27 */
28
29#include <sys/param.h>
30#include <sys/exec.h>
31#include <sys/imgact.h>
32#include <sys/imgact_aout.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/malloc.h>
36#include <sys/mutex.h>
37#include <sys/proc.h>
38#include <sys/resourcevar.h>
39#include <sys/signalvar.h>
40#include <sys/syscall.h>
41#include <sys/sysent.h>
42#include <sys/systm.h>
43#include <sys/vnode.h>
44#include <sys/user.h>
45
46#include <machine/frame.h>
47#include <machine/md_var.h>
48
49#include <vm/vm.h>
50#include <vm/pmap.h>
51#include <vm/vm_map.h>
52#include <vm/vm_object.h>
53#include <vm/vm_param.h>
54
55static int exec_aout_imgact(struct image_params *imgp);
56static int aout_fixup(register_t **stack_base, struct image_params *imgp);
57
58struct sysentvec aout_sysvec = {
59 SYS_MAXSYSCALL,
60 sysent,
61 0,
62 0,
63 NULL,
64 0,
65 NULL,
66 NULL,
67 aout_fixup,
68 sendsig,
69 sigcode,
70 &szsigcode,
71 NULL,
72 "FreeBSD a.out",
73 aout_coredump,
74 NULL,
75 MINSIGSTKSZ,
76 PAGE_SIZE,
77 VM_MIN_ADDRESS,
78 VM_MAXUSER_ADDRESS,
79 USRSTACK,
80 PS_STRINGS,
81 VM_PROT_ALL,
82 exec_copyout_strings,
83 exec_setregs
84};
85
86static int
87aout_fixup(stack_base, imgp)
88 register_t **stack_base;
89 struct image_params *imgp;
90{
91
92 return (suword(--(*stack_base), imgp->argc));
93}
94
95static int
96exec_aout_imgact(imgp)
97 struct image_params *imgp;
98{
99 const struct exec *a_out = (const struct exec *) imgp->image_header;
100 struct vmspace *vmspace;
101 struct vnode *vp;
102 vm_map_t map;
103 vm_object_t object;
104 vm_offset_t text_end, data_end;
105 unsigned long virtual_offset;
106 unsigned long file_offset;
107 unsigned long bss_size;
108 int error;
109
110 GIANT_REQUIRED;
111
112 /*
113 * Linux and *BSD binaries look very much alike,
114 * only the machine id is different:
115 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
116 * NetBSD is in network byte order.. ugh.
117 */
118 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
119 ((a_out->a_magic >> 16) & 0xff) != 0 &&
120 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
121 return -1;
122
123 /*
124 * Set file/virtual offset based on a.out variant.
125 * We do two cases: host byte order and network byte order
126 * (for NetBSD compatibility)
127 */
128 switch ((int)(a_out->a_magic & 0xffff)) {
129 case ZMAGIC:
130 virtual_offset = 0;
131 if (a_out->a_text) {
132 file_offset = PAGE_SIZE;
133 } else {
134 /* Bill's "screwball mode" */
135 file_offset = 0;
136 }
137 break;
138 case QMAGIC:
139 virtual_offset = PAGE_SIZE;
140 file_offset = 0;
141 /* Pass PS_STRINGS for BSD/OS binaries only. */
142 if (N_GETMID(*a_out) == MID_ZERO)
| 27 */
28
29#include <sys/param.h>
30#include <sys/exec.h>
31#include <sys/imgact.h>
32#include <sys/imgact_aout.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/malloc.h>
36#include <sys/mutex.h>
37#include <sys/proc.h>
38#include <sys/resourcevar.h>
39#include <sys/signalvar.h>
40#include <sys/syscall.h>
41#include <sys/sysent.h>
42#include <sys/systm.h>
43#include <sys/vnode.h>
44#include <sys/user.h>
45
46#include <machine/frame.h>
47#include <machine/md_var.h>
48
49#include <vm/vm.h>
50#include <vm/pmap.h>
51#include <vm/vm_map.h>
52#include <vm/vm_object.h>
53#include <vm/vm_param.h>
54
55static int exec_aout_imgact(struct image_params *imgp);
56static int aout_fixup(register_t **stack_base, struct image_params *imgp);
57
58struct sysentvec aout_sysvec = {
59 SYS_MAXSYSCALL,
60 sysent,
61 0,
62 0,
63 NULL,
64 0,
65 NULL,
66 NULL,
67 aout_fixup,
68 sendsig,
69 sigcode,
70 &szsigcode,
71 NULL,
72 "FreeBSD a.out",
73 aout_coredump,
74 NULL,
75 MINSIGSTKSZ,
76 PAGE_SIZE,
77 VM_MIN_ADDRESS,
78 VM_MAXUSER_ADDRESS,
79 USRSTACK,
80 PS_STRINGS,
81 VM_PROT_ALL,
82 exec_copyout_strings,
83 exec_setregs
84};
85
86static int
87aout_fixup(stack_base, imgp)
88 register_t **stack_base;
89 struct image_params *imgp;
90{
91
92 return (suword(--(*stack_base), imgp->argc));
93}
94
95static int
96exec_aout_imgact(imgp)
97 struct image_params *imgp;
98{
99 const struct exec *a_out = (const struct exec *) imgp->image_header;
100 struct vmspace *vmspace;
101 struct vnode *vp;
102 vm_map_t map;
103 vm_object_t object;
104 vm_offset_t text_end, data_end;
105 unsigned long virtual_offset;
106 unsigned long file_offset;
107 unsigned long bss_size;
108 int error;
109
110 GIANT_REQUIRED;
111
112 /*
113 * Linux and *BSD binaries look very much alike,
114 * only the machine id is different:
115 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
116 * NetBSD is in network byte order.. ugh.
117 */
118 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
119 ((a_out->a_magic >> 16) & 0xff) != 0 &&
120 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
121 return -1;
122
123 /*
124 * Set file/virtual offset based on a.out variant.
125 * We do two cases: host byte order and network byte order
126 * (for NetBSD compatibility)
127 */
128 switch ((int)(a_out->a_magic & 0xffff)) {
129 case ZMAGIC:
130 virtual_offset = 0;
131 if (a_out->a_text) {
132 file_offset = PAGE_SIZE;
133 } else {
134 /* Bill's "screwball mode" */
135 file_offset = 0;
136 }
137 break;
138 case QMAGIC:
139 virtual_offset = PAGE_SIZE;
140 file_offset = 0;
141 /* Pass PS_STRINGS for BSD/OS binaries only. */
142 if (N_GETMID(*a_out) == MID_ZERO)
|
143 imgp->ps_strings = PS_STRINGS;
| 143 imgp->ps_strings = aout_sysvec.sv_psstrings;
|
144 break;
145 default:
146 /* NetBSD compatibility */
147 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
148 case ZMAGIC:
149 case QMAGIC:
150 virtual_offset = PAGE_SIZE;
151 file_offset = 0;
152 break;
153 default:
154 return (-1);
155 }
156 }
157
158 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
159
160 /*
161 * Check various fields in header for validity/bounds.
162 */
163 if (/* entry point must lay with text region */
164 a_out->a_entry < virtual_offset ||
165 a_out->a_entry >= virtual_offset + a_out->a_text ||
166
167 /* text and data size must each be page rounded */
168 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
169 return (-1);
170
171 /* text + data can't exceed file size */
172 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
173 return (EFAULT);
174
175 /*
176 * text/data/bss must not exceed limits
177 */
178 mtx_assert(&Giant, MA_OWNED);
179 if (/* text can't exceed maximum text size */
180 a_out->a_text > maxtsiz ||
181
182 /* data + bss can't exceed rlimit */
183 a_out->a_data + bss_size >
184 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
185 return (ENOMEM);
186
187 /* copy in arguments and/or environment from old process */
188 error = exec_extract_strings(imgp);
189 if (error)
190 return (error);
191
192 /*
193 * Destroy old process VM and create a new one (with a new stack)
194 */
| 144 break;
145 default:
146 /* NetBSD compatibility */
147 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
148 case ZMAGIC:
149 case QMAGIC:
150 virtual_offset = PAGE_SIZE;
151 file_offset = 0;
152 break;
153 default:
154 return (-1);
155 }
156 }
157
158 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
159
160 /*
161 * Check various fields in header for validity/bounds.
162 */
163 if (/* entry point must lay with text region */
164 a_out->a_entry < virtual_offset ||
165 a_out->a_entry >= virtual_offset + a_out->a_text ||
166
167 /* text and data size must each be page rounded */
168 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
169 return (-1);
170
171 /* text + data can't exceed file size */
172 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
173 return (EFAULT);
174
175 /*
176 * text/data/bss must not exceed limits
177 */
178 mtx_assert(&Giant, MA_OWNED);
179 if (/* text can't exceed maximum text size */
180 a_out->a_text > maxtsiz ||
181
182 /* data + bss can't exceed rlimit */
183 a_out->a_data + bss_size >
184 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
185 return (ENOMEM);
186
187 /* copy in arguments and/or environment from old process */
188 error = exec_extract_strings(imgp);
189 if (error)
190 return (error);
191
192 /*
193 * Destroy old process VM and create a new one (with a new stack)
194 */
|
195 exec_new_vmspace(imgp, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS, USRSTACK);
| 195 exec_new_vmspace(imgp, &aout_sysvec);
|
196
197 /*
198 * The vm space can be changed by exec_new_vmspace
199 */
200 vmspace = imgp->proc->p_vmspace;
201
202 vp = imgp->vp;
203 object = imgp->object;
204 map = &vmspace->vm_map;
205 vm_map_lock(map);
206 vm_object_reference(object);
207
208 text_end = virtual_offset + a_out->a_text;
209 error = vm_map_insert(map, object,
210 file_offset,
211 virtual_offset, text_end,
212 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
213 MAP_COPY_ON_WRITE | MAP_PREFAULT);
214 if (error) {
215 vm_map_unlock(map);
216 return (error);
217 }
218 data_end = text_end + a_out->a_data;
219 if (a_out->a_data) {
220 vm_object_reference(object);
221 error = vm_map_insert(map, object,
222 file_offset + a_out->a_text,
223 text_end, data_end,
224 VM_PROT_ALL, VM_PROT_ALL,
225 MAP_COPY_ON_WRITE | MAP_PREFAULT);
226 if (error) {
227 vm_map_unlock(map);
228 return (error);
229 }
230 }
231
232 if (bss_size) {
233 error = vm_map_insert(map, NULL, 0,
234 data_end, data_end + bss_size,
235 VM_PROT_ALL, VM_PROT_ALL, 0);
236 if (error) {
237 vm_map_unlock(map);
238 return (error);
239 }
240 }
241 vm_map_unlock(map);
242
243 /* Fill in process VM information */
244 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
245 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
246 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
247 vmspace->vm_daddr = (caddr_t) (uintptr_t)
248 (virtual_offset + a_out->a_text);
249
250 /* Fill in image_params */
251 imgp->interpreted = 0;
252 imgp->entry_addr = a_out->a_entry;
253
254 imgp->proc->p_sysent = &aout_sysvec;
255
256 return (0);
257}
258
259/*
260 * Dump core, into a file named as described in the comments for
261 * expand_name(), unless the process was setuid/setgid.
262 */
263int
264aout_coredump(td, vp, limit)
265 register struct thread *td;
266 register struct vnode *vp;
267 off_t limit;
268{
269 struct proc *p = td->td_proc;
270 register struct ucred *cred = td->td_ucred;
271 register struct vmspace *vm = p->p_vmspace;
272 char *tempuser;
273 int error;
274
275 if (ctob((uarea_pages + kstack_pages)
276 + vm->vm_dsize + vm->vm_ssize) >= limit)
277 return (EFAULT);
278 tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
279 M_WAITOK | M_ZERO);
280 if (tempuser == NULL)
281 return (ENOMEM);
282 PROC_LOCK(p);
283 fill_kinfo_proc(p, &p->p_uarea->u_kproc);
284 PROC_UNLOCK(p);
285 bcopy(p->p_uarea, tempuser, sizeof(struct user));
286 bcopy(td->td_frame,
287 tempuser + ctob(uarea_pages) +
288 ((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
289 sizeof(struct trapframe));
290 error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
291 ctob(uarea_pages + kstack_pages),
292 (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
293 (int *)NULL, td);
294 free(tempuser, M_TEMP);
295 if (error == 0)
296 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
297 (int)ctob(vm->vm_dsize),
298 (off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
299 IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
300 if (error == 0)
301 error = vn_rdwr_inchunks(UIO_WRITE, vp,
| 196
197 /*
198 * The vm space can be changed by exec_new_vmspace
199 */
200 vmspace = imgp->proc->p_vmspace;
201
202 vp = imgp->vp;
203 object = imgp->object;
204 map = &vmspace->vm_map;
205 vm_map_lock(map);
206 vm_object_reference(object);
207
208 text_end = virtual_offset + a_out->a_text;
209 error = vm_map_insert(map, object,
210 file_offset,
211 virtual_offset, text_end,
212 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
213 MAP_COPY_ON_WRITE | MAP_PREFAULT);
214 if (error) {
215 vm_map_unlock(map);
216 return (error);
217 }
218 data_end = text_end + a_out->a_data;
219 if (a_out->a_data) {
220 vm_object_reference(object);
221 error = vm_map_insert(map, object,
222 file_offset + a_out->a_text,
223 text_end, data_end,
224 VM_PROT_ALL, VM_PROT_ALL,
225 MAP_COPY_ON_WRITE | MAP_PREFAULT);
226 if (error) {
227 vm_map_unlock(map);
228 return (error);
229 }
230 }
231
232 if (bss_size) {
233 error = vm_map_insert(map, NULL, 0,
234 data_end, data_end + bss_size,
235 VM_PROT_ALL, VM_PROT_ALL, 0);
236 if (error) {
237 vm_map_unlock(map);
238 return (error);
239 }
240 }
241 vm_map_unlock(map);
242
243 /* Fill in process VM information */
244 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
245 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
246 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
247 vmspace->vm_daddr = (caddr_t) (uintptr_t)
248 (virtual_offset + a_out->a_text);
249
250 /* Fill in image_params */
251 imgp->interpreted = 0;
252 imgp->entry_addr = a_out->a_entry;
253
254 imgp->proc->p_sysent = &aout_sysvec;
255
256 return (0);
257}
258
259/*
260 * Dump core, into a file named as described in the comments for
261 * expand_name(), unless the process was setuid/setgid.
262 */
263int
264aout_coredump(td, vp, limit)
265 register struct thread *td;
266 register struct vnode *vp;
267 off_t limit;
268{
269 struct proc *p = td->td_proc;
270 register struct ucred *cred = td->td_ucred;
271 register struct vmspace *vm = p->p_vmspace;
272 char *tempuser;
273 int error;
274
275 if (ctob((uarea_pages + kstack_pages)
276 + vm->vm_dsize + vm->vm_ssize) >= limit)
277 return (EFAULT);
278 tempuser = malloc(ctob(uarea_pages + kstack_pages), M_TEMP,
279 M_WAITOK | M_ZERO);
280 if (tempuser == NULL)
281 return (ENOMEM);
282 PROC_LOCK(p);
283 fill_kinfo_proc(p, &p->p_uarea->u_kproc);
284 PROC_UNLOCK(p);
285 bcopy(p->p_uarea, tempuser, sizeof(struct user));
286 bcopy(td->td_frame,
287 tempuser + ctob(uarea_pages) +
288 ((caddr_t)td->td_frame - (caddr_t)td->td_kstack),
289 sizeof(struct trapframe));
290 error = vn_rdwr(UIO_WRITE, vp, (caddr_t)tempuser,
291 ctob(uarea_pages + kstack_pages),
292 (off_t)0, UIO_SYSSPACE, IO_UNIT, cred, NOCRED,
293 (int *)NULL, td);
294 free(tempuser, M_TEMP);
295 if (error == 0)
296 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr,
297 (int)ctob(vm->vm_dsize),
298 (off_t)ctob(uarea_pages + kstack_pages), UIO_USERSPACE,
299 IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
300 if (error == 0)
301 error = vn_rdwr_inchunks(UIO_WRITE, vp,
|
302 (caddr_t)trunc_page(USRSTACK - ctob(vm->vm_ssize)),
303 round_page(ctob(vm->vm_ssize)),
| 302 (caddr_t)trunc_page(p->p_sysent->sv_usrstack -
303 ctob(vm->vm_ssize)), round_page(ctob(vm->vm_ssize)),
|
304 (off_t)ctob(uarea_pages + kstack_pages) +
305 ctob(vm->vm_dsize), UIO_USERSPACE,
306 IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
307 return (error);
308}
309
310/*
311 * Tell kern_execve.c about it, with a little help from the linker.
312 */
313static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
314EXEC_SET(aout, aout_execsw);
| 304 (off_t)ctob(uarea_pages + kstack_pages) +
305 ctob(vm->vm_dsize), UIO_USERSPACE,
306 IO_UNIT | IO_DIRECT, cred, NOCRED, (int *) NULL, td);
307 return (error);
308}
309
310/*
311 * Tell kern_execve.c about it, with a little help from the linker.
312 */
313static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
314EXEC_SET(aout, aout_execsw);
|