1/*-
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 */
9
10/*
11 * This module handles execution of a.out files which have been run through
12 * "gzip". This saves diskspace, but wastes cpu-cycles and VM.
13 *
14 * TODO:
15 * text-segments should be made R/O after being filled
16 * is the vm-stuff safe ?
17 * should handle the entire header of gzip'ed stuff.
18 * inflate isn't quite reentrant yet...
19 * error-handling is a mess...
20 * so is the rest...
21 * tidy up unnecesary includes
22 */
23
24#include <sys/cdefs.h>
| 1/*-
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 */
9
10/*
11 * This module handles execution of a.out files which have been run through
12 * "gzip". This saves diskspace, but wastes cpu-cycles and VM.
13 *
14 * TODO:
15 * text-segments should be made R/O after being filled
16 * is the vm-stuff safe ?
17 * should handle the entire header of gzip'ed stuff.
18 * inflate isn't quite reentrant yet...
19 * error-handling is a mess...
20 * so is the rest...
21 * tidy up unnecesary includes
22 */
23
24#include <sys/cdefs.h>
|
25__FBSDID("$FreeBSD: head/sys/kern/imgact_gzip.c 220373 2011-04-05 20:23:59Z trasz $");
| 25__FBSDID("$FreeBSD: head/sys/kern/imgact_gzip.c 231885 2012-02-17 23:47:16Z kib $");
|
26
27#include <sys/param.h>
28#include <sys/exec.h>
29#include <sys/imgact.h>
30#include <sys/imgact_aout.h>
31#include <sys/kernel.h>
32#include <sys/lock.h>
33#include <sys/mman.h>
34#include <sys/mutex.h>
35#include <sys/proc.h>
36#include <sys/racct.h>
37#include <sys/resourcevar.h>
38#include <sys/sysent.h>
39#include <sys/systm.h>
40#include <sys/vnode.h>
41#include <sys/inflate.h>
42
43#include <vm/vm.h>
44#include <vm/vm_param.h>
45#include <vm/pmap.h>
46#include <vm/vm_map.h>
47#include <vm/vm_kern.h>
48#include <vm/vm_extern.h>
49
50struct imgact_gzip {
51 struct image_params *ip;
52 struct exec a_out;
53 int error;
54 int gotheader;
55 int where;
56 u_char *inbuf;
57 u_long offset;
58 u_long output;
59 u_long len;
60 int idx;
61 u_long virtual_offset, file_offset, file_end, bss_size;
62};
63
64static int exec_gzip_imgact(struct image_params *imgp);
65static int NextByte(void *vp);
66static int do_aout_hdr(struct imgact_gzip *);
67static int Flush(void *vp, u_char *, u_long siz);
68
69static int
70exec_gzip_imgact(imgp)
71 struct image_params *imgp;
72{
| 26
27#include <sys/param.h>
28#include <sys/exec.h>
29#include <sys/imgact.h>
30#include <sys/imgact_aout.h>
31#include <sys/kernel.h>
32#include <sys/lock.h>
33#include <sys/mman.h>
34#include <sys/mutex.h>
35#include <sys/proc.h>
36#include <sys/racct.h>
37#include <sys/resourcevar.h>
38#include <sys/sysent.h>
39#include <sys/systm.h>
40#include <sys/vnode.h>
41#include <sys/inflate.h>
42
43#include <vm/vm.h>
44#include <vm/vm_param.h>
45#include <vm/pmap.h>
46#include <vm/vm_map.h>
47#include <vm/vm_kern.h>
48#include <vm/vm_extern.h>
49
50struct imgact_gzip {
51 struct image_params *ip;
52 struct exec a_out;
53 int error;
54 int gotheader;
55 int where;
56 u_char *inbuf;
57 u_long offset;
58 u_long output;
59 u_long len;
60 int idx;
61 u_long virtual_offset, file_offset, file_end, bss_size;
62};
63
64static int exec_gzip_imgact(struct image_params *imgp);
65static int NextByte(void *vp);
66static int do_aout_hdr(struct imgact_gzip *);
67static int Flush(void *vp, u_char *, u_long siz);
68
69static int
70exec_gzip_imgact(imgp)
71 struct image_params *imgp;
72{
|
73 int error, error2 = 0;
| 73 int error;
|
74 const u_char *p = (const u_char *) imgp->image_header;
75 struct imgact_gzip igz;
76 struct inflate infl;
77 struct vmspace *vmspace;
78
79 /* If these four are not OK, it isn't a gzip file */
80 if (p[0] != 0x1f)
81 return -1; /* 0 Simply magic */
82 if (p[1] != 0x8b)
83 return -1; /* 1 Simply magic */
84 if (p[2] != 0x08)
85 return -1; /* 2 Compression method */
86 if (p[9] != 0x03)
87 return -1; /* 9 OS compressed on */
88
89 /*
90 * If this one contains anything but a comment or a filename marker,
91 * we don't want to chew on it
92 */
93 if (p[3] & ~(0x18))
94 return ENOEXEC; /* 3 Flags */
95
96 /* These are of no use to us */
97 /* 4-7 Timestamp */
98 /* 8 Extra flags */
99
100 bzero(&igz, sizeof igz);
101 bzero(&infl, sizeof infl);
102 infl.gz_private = (void *) &igz;
103 infl.gz_input = NextByte;
104 infl.gz_output = Flush;
105
106 igz.ip = imgp;
107 igz.idx = 10;
108
109 if (p[3] & 0x08) { /* skip a filename */
110 while (p[igz.idx++])
111 if (igz.idx >= PAGE_SIZE)
112 return ENOEXEC;
113 }
114 if (p[3] & 0x10) { /* skip a comment */
115 while (p[igz.idx++])
116 if (igz.idx >= PAGE_SIZE)
117 return ENOEXEC;
118 }
119 igz.len = imgp->attr->va_size;
120
121 error = inflate(&infl);
122
123 /*
124 * The unzipped file may not even have been long enough to contain
125 * a header giving Flush() a chance to return error. Check for this.
126 */
127 if ( !igz.gotheader )
128 return ENOEXEC;
129
130 if ( !error ) {
131 vmspace = imgp->proc->p_vmspace;
132 error = vm_map_protect(&vmspace->vm_map,
133 (vm_offset_t) vmspace->vm_taddr,
134 (vm_offset_t) (vmspace->vm_taddr +
135 (vmspace->vm_tsize << PAGE_SHIFT)) ,
136 VM_PROT_READ|VM_PROT_EXECUTE,0);
137 }
138
| 74 const u_char *p = (const u_char *) imgp->image_header;
75 struct imgact_gzip igz;
76 struct inflate infl;
77 struct vmspace *vmspace;
78
79 /* If these four are not OK, it isn't a gzip file */
80 if (p[0] != 0x1f)
81 return -1; /* 0 Simply magic */
82 if (p[1] != 0x8b)
83 return -1; /* 1 Simply magic */
84 if (p[2] != 0x08)
85 return -1; /* 2 Compression method */
86 if (p[9] != 0x03)
87 return -1; /* 9 OS compressed on */
88
89 /*
90 * If this one contains anything but a comment or a filename marker,
91 * we don't want to chew on it
92 */
93 if (p[3] & ~(0x18))
94 return ENOEXEC; /* 3 Flags */
95
96 /* These are of no use to us */
97 /* 4-7 Timestamp */
98 /* 8 Extra flags */
99
100 bzero(&igz, sizeof igz);
101 bzero(&infl, sizeof infl);
102 infl.gz_private = (void *) &igz;
103 infl.gz_input = NextByte;
104 infl.gz_output = Flush;
105
106 igz.ip = imgp;
107 igz.idx = 10;
108
109 if (p[3] & 0x08) { /* skip a filename */
110 while (p[igz.idx++])
111 if (igz.idx >= PAGE_SIZE)
112 return ENOEXEC;
113 }
114 if (p[3] & 0x10) { /* skip a comment */
115 while (p[igz.idx++])
116 if (igz.idx >= PAGE_SIZE)
117 return ENOEXEC;
118 }
119 igz.len = imgp->attr->va_size;
120
121 error = inflate(&infl);
122
123 /*
124 * The unzipped file may not even have been long enough to contain
125 * a header giving Flush() a chance to return error. Check for this.
126 */
127 if ( !igz.gotheader )
128 return ENOEXEC;
129
130 if ( !error ) {
131 vmspace = imgp->proc->p_vmspace;
132 error = vm_map_protect(&vmspace->vm_map,
133 (vm_offset_t) vmspace->vm_taddr,
134 (vm_offset_t) (vmspace->vm_taddr +
135 (vmspace->vm_tsize << PAGE_SHIFT)) ,
136 VM_PROT_READ|VM_PROT_EXECUTE,0);
137 }
138
|
139 if (igz.inbuf) {
140 error2 =
141 vm_map_remove(kernel_map, (vm_offset_t) igz.inbuf,
142 (vm_offset_t) igz.inbuf + PAGE_SIZE);
143 }
144 if (igz.error || error || error2) {
| 139 if (igz.inbuf)
140 kmem_free_wakeup(exec_map, (vm_offset_t)igz.inbuf, PAGE_SIZE);
141 if (igz.error || error) {
|
145 printf("Output=%lu ", igz.output);
| 142 printf("Output=%lu ", igz.output);
|
146 printf("Inflate_error=%d igz.error=%d error2=%d where=%d\n",
147 error, igz.error, error2, igz.where);
| 143 printf("Inflate_error=%d igz.error=%d where=%d\n",
144 error, igz.error, igz.where);
|
148 }
149 if (igz.error)
150 return igz.error;
151 if (error)
152 return ENOEXEC;
| 145 }
146 if (igz.error)
147 return igz.error;
148 if (error)
149 return ENOEXEC;
|
153 if (error2)
154 return error2;
| |
155 return 0;
156}
157
158static int
159do_aout_hdr(struct imgact_gzip * gz)
160{
161 int error;
162 struct vmspace *vmspace;
163 vm_offset_t vmaddr;
164
165 /*
166 * Set file/virtual offset based on a.out variant. We do two cases:
167 * host byte order and network byte order (for NetBSD compatibility)
168 */
169 switch ((int) (gz->a_out.a_magic & 0xffff)) {
170 case ZMAGIC:
171 gz->virtual_offset = 0;
172 if (gz->a_out.a_text) {
173 gz->file_offset = PAGE_SIZE;
174 } else {
175 /* Bill's "screwball mode" */
176 gz->file_offset = 0;
177 }
178 break;
179 case QMAGIC:
180 gz->virtual_offset = PAGE_SIZE;
181 gz->file_offset = 0;
182 break;
183 default:
184 /* NetBSD compatibility */
185 switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) {
186 case ZMAGIC:
187 case QMAGIC:
188 gz->virtual_offset = PAGE_SIZE;
189 gz->file_offset = 0;
190 break;
191 default:
192 gz->where = __LINE__;
193 return (-1);
194 }
195 }
196
197 gz->bss_size = roundup(gz->a_out.a_bss, PAGE_SIZE);
198
199 /*
200 * Check various fields in header for validity/bounds.
201 */
202 if ( /* entry point must lay with text region */
203 gz->a_out.a_entry < gz->virtual_offset ||
204 gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text ||
205
206 /* text and data size must each be page rounded */
207 gz->a_out.a_text & PAGE_MASK || gz->a_out.a_data & PAGE_MASK) {
208 gz->where = __LINE__;
209 return (-1);
210 }
211 /*
212 * text/data/bss must not exceed limits
213 */
214 PROC_LOCK(gz->ip->proc);
215 if ( /* text can't exceed maximum text size */
216 gz->a_out.a_text > maxtsiz ||
217
218 /* data + bss can't exceed rlimit */
219 gz->a_out.a_data + gz->bss_size >
220 lim_cur(gz->ip->proc, RLIMIT_DATA) ||
221 racct_set(gz->ip->proc, RACCT_DATA,
222 gz->a_out.a_data + gz->bss_size) != 0) {
223 PROC_UNLOCK(gz->ip->proc);
224 gz->where = __LINE__;
225 return (ENOMEM);
226 }
227 PROC_UNLOCK(gz->ip->proc);
228 /* Find out how far we should go */
229 gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data;
230
231 /*
232 * Avoid a possible deadlock if the current address space is destroyed
233 * and that address space maps the locked vnode. In the common case,
234 * the locked vnode's v_usecount is decremented but remains greater
235 * than zero. Consequently, the vnode lock is not needed by vrele().
236 * However, in cases where the vnode lock is external, such as nullfs,
237 * v_usecount may become zero.
238 */
239 VOP_UNLOCK(gz->ip->vp, 0);
240
241 /*
242 * Destroy old process VM and create a new one (with a new stack)
243 */
244 error = exec_new_vmspace(gz->ip, &aout_sysvec);
245
246 vn_lock(gz->ip->vp, LK_EXCLUSIVE | LK_RETRY);
247 if (error) {
248 gz->where = __LINE__;
249 return (error);
250 }
251
252 vmspace = gz->ip->proc->p_vmspace;
253
254 vmaddr = gz->virtual_offset;
255
256 error = vm_mmap(&vmspace->vm_map,
257 &vmaddr,
258 gz->a_out.a_text + gz->a_out.a_data,
259 VM_PROT_ALL, VM_PROT_ALL, MAP_ANON | MAP_FIXED,
260 OBJT_DEFAULT,
261 NULL,
262 0);
263
264 if (error) {
265 gz->where = __LINE__;
266 return (error);
267 }
268
269 if (gz->bss_size != 0) {
270 /*
271 * Allocate demand-zeroed area for uninitialized data.
272 * "bss" = 'block started by symbol' - named after the
273 * IBM 7090 instruction of the same name.
274 */
275 vmaddr = gz->virtual_offset + gz->a_out.a_text +
276 gz->a_out.a_data;
277 error = vm_map_find(&vmspace->vm_map,
278 NULL,
279 0,
280 &vmaddr,
281 gz->bss_size,
282 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
283 if (error) {
284 gz->where = __LINE__;
285 return (error);
286 }
287 }
288 /* Fill in process VM information */
289 vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT;
290 vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT;
291 vmspace->vm_taddr = (caddr_t) (uintptr_t) gz->virtual_offset;
292 vmspace->vm_daddr = (caddr_t) (uintptr_t)
293 (gz->virtual_offset + gz->a_out.a_text);
294
295 /* Fill in image_params */
296 gz->ip->interpreted = 0;
297 gz->ip->entry_addr = gz->a_out.a_entry;
298
299 gz->ip->proc->p_sysent = &aout_sysvec;
300
301 return 0;
302}
303
304static int
305NextByte(void *vp)
306{
307 int error;
308 struct imgact_gzip *igz = (struct imgact_gzip *) vp;
309
310 if (igz->idx >= igz->len) {
311 igz->where = __LINE__;
312 return GZ_EOF;
313 }
314 if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) {
315 return igz->inbuf[(igz->idx++) - igz->offset];
316 }
| 150 return 0;
151}
152
153static int
154do_aout_hdr(struct imgact_gzip * gz)
155{
156 int error;
157 struct vmspace *vmspace;
158 vm_offset_t vmaddr;
159
160 /*
161 * Set file/virtual offset based on a.out variant. We do two cases:
162 * host byte order and network byte order (for NetBSD compatibility)
163 */
164 switch ((int) (gz->a_out.a_magic & 0xffff)) {
165 case ZMAGIC:
166 gz->virtual_offset = 0;
167 if (gz->a_out.a_text) {
168 gz->file_offset = PAGE_SIZE;
169 } else {
170 /* Bill's "screwball mode" */
171 gz->file_offset = 0;
172 }
173 break;
174 case QMAGIC:
175 gz->virtual_offset = PAGE_SIZE;
176 gz->file_offset = 0;
177 break;
178 default:
179 /* NetBSD compatibility */
180 switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) {
181 case ZMAGIC:
182 case QMAGIC:
183 gz->virtual_offset = PAGE_SIZE;
184 gz->file_offset = 0;
185 break;
186 default:
187 gz->where = __LINE__;
188 return (-1);
189 }
190 }
191
192 gz->bss_size = roundup(gz->a_out.a_bss, PAGE_SIZE);
193
194 /*
195 * Check various fields in header for validity/bounds.
196 */
197 if ( /* entry point must lay with text region */
198 gz->a_out.a_entry < gz->virtual_offset ||
199 gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text ||
200
201 /* text and data size must each be page rounded */
202 gz->a_out.a_text & PAGE_MASK || gz->a_out.a_data & PAGE_MASK) {
203 gz->where = __LINE__;
204 return (-1);
205 }
206 /*
207 * text/data/bss must not exceed limits
208 */
209 PROC_LOCK(gz->ip->proc);
210 if ( /* text can't exceed maximum text size */
211 gz->a_out.a_text > maxtsiz ||
212
213 /* data + bss can't exceed rlimit */
214 gz->a_out.a_data + gz->bss_size >
215 lim_cur(gz->ip->proc, RLIMIT_DATA) ||
216 racct_set(gz->ip->proc, RACCT_DATA,
217 gz->a_out.a_data + gz->bss_size) != 0) {
218 PROC_UNLOCK(gz->ip->proc);
219 gz->where = __LINE__;
220 return (ENOMEM);
221 }
222 PROC_UNLOCK(gz->ip->proc);
223 /* Find out how far we should go */
224 gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data;
225
226 /*
227 * Avoid a possible deadlock if the current address space is destroyed
228 * and that address space maps the locked vnode. In the common case,
229 * the locked vnode's v_usecount is decremented but remains greater
230 * than zero. Consequently, the vnode lock is not needed by vrele().
231 * However, in cases where the vnode lock is external, such as nullfs,
232 * v_usecount may become zero.
233 */
234 VOP_UNLOCK(gz->ip->vp, 0);
235
236 /*
237 * Destroy old process VM and create a new one (with a new stack)
238 */
239 error = exec_new_vmspace(gz->ip, &aout_sysvec);
240
241 vn_lock(gz->ip->vp, LK_EXCLUSIVE | LK_RETRY);
242 if (error) {
243 gz->where = __LINE__;
244 return (error);
245 }
246
247 vmspace = gz->ip->proc->p_vmspace;
248
249 vmaddr = gz->virtual_offset;
250
251 error = vm_mmap(&vmspace->vm_map,
252 &vmaddr,
253 gz->a_out.a_text + gz->a_out.a_data,
254 VM_PROT_ALL, VM_PROT_ALL, MAP_ANON | MAP_FIXED,
255 OBJT_DEFAULT,
256 NULL,
257 0);
258
259 if (error) {
260 gz->where = __LINE__;
261 return (error);
262 }
263
264 if (gz->bss_size != 0) {
265 /*
266 * Allocate demand-zeroed area for uninitialized data.
267 * "bss" = 'block started by symbol' - named after the
268 * IBM 7090 instruction of the same name.
269 */
270 vmaddr = gz->virtual_offset + gz->a_out.a_text +
271 gz->a_out.a_data;
272 error = vm_map_find(&vmspace->vm_map,
273 NULL,
274 0,
275 &vmaddr,
276 gz->bss_size,
277 FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
278 if (error) {
279 gz->where = __LINE__;
280 return (error);
281 }
282 }
283 /* Fill in process VM information */
284 vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT;
285 vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT;
286 vmspace->vm_taddr = (caddr_t) (uintptr_t) gz->virtual_offset;
287 vmspace->vm_daddr = (caddr_t) (uintptr_t)
288 (gz->virtual_offset + gz->a_out.a_text);
289
290 /* Fill in image_params */
291 gz->ip->interpreted = 0;
292 gz->ip->entry_addr = gz->a_out.a_entry;
293
294 gz->ip->proc->p_sysent = &aout_sysvec;
295
296 return 0;
297}
298
299static int
300NextByte(void *vp)
301{
302 int error;
303 struct imgact_gzip *igz = (struct imgact_gzip *) vp;
304
305 if (igz->idx >= igz->len) {
306 igz->where = __LINE__;
307 return GZ_EOF;
308 }
309 if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) {
310 return igz->inbuf[(igz->idx++) - igz->offset];
311 }
|
317 if (igz->inbuf) {
318 error = vm_map_remove(kernel_map, (vm_offset_t) igz->inbuf,
319 (vm_offset_t) igz->inbuf + PAGE_SIZE);
320 if (error) {
321 igz->where = __LINE__;
322 igz->error = error;
323 return GZ_EOF;
324 }
325 }
| 312 if (igz->inbuf)
313 kmem_free_wakeup(exec_map, (vm_offset_t)igz->inbuf, PAGE_SIZE);
|
326 igz->offset = igz->idx & ~PAGE_MASK;
327
| 314 igz->offset = igz->idx & ~PAGE_MASK;
315
|
328 error = vm_mmap(kernel_map, /* map */
| 316 error = vm_mmap(exec_map, /* map */
|
329 (vm_offset_t *) & igz->inbuf, /* address */
330 PAGE_SIZE, /* size */
331 VM_PROT_READ, /* protection */
332 VM_PROT_READ, /* max protection */
333 0, /* flags */
334 OBJT_VNODE, /* handle type */
335 igz->ip->vp, /* vnode */
336 igz->offset); /* offset */
337 if (error) {
338 igz->where = __LINE__;
339 igz->error = error;
340 return GZ_EOF;
341 }
342 return igz->inbuf[(igz->idx++) - igz->offset];
343}
344
345static int
346Flush(void *vp, u_char * ptr, u_long siz)
347{
348 struct imgact_gzip *gz = (struct imgact_gzip *) vp;
349 u_char *p = ptr, *q;
350 int i;
351
352 /* First, find an a.out-header. */
353 if (gz->output < sizeof gz->a_out) {
354 q = (u_char *) & gz->a_out;
355 i = min(siz, sizeof gz->a_out - gz->output);
356 bcopy(p, q + gz->output, i);
357 gz->output += i;
358 p += i;
359 siz -= i;
360 if (gz->output == sizeof gz->a_out) {
361 gz->gotheader = 1;
362 i = do_aout_hdr(gz);
363 if (i == -1) {
364 if (!gz->where)
365 gz->where = __LINE__;
366 gz->error = ENOEXEC;
367 return ENOEXEC;
368 } else if (i) {
369 gz->where = __LINE__;
370 gz->error = i;
371 return ENOEXEC;
372 }
373 if (gz->file_offset == 0) {
374 q = (u_char *) (uintptr_t) gz->virtual_offset;
375 copyout(&gz->a_out, q, sizeof gz->a_out);
376 }
377 }
378 }
379 /* Skip over zero-padded first PAGE if needed */
380 if (gz->output < gz->file_offset &&
381 gz->output + siz > gz->file_offset) {
382 i = min(siz, gz->file_offset - gz->output);
383 gz->output += i;
384 p += i;
385 siz -= i;
386 }
387 if (gz->output >= gz->file_offset && gz->output < gz->file_end) {
388 i = min(siz, gz->file_end - gz->output);
389 q = (u_char *) (uintptr_t)
390 (gz->virtual_offset + gz->output - gz->file_offset);
391 copyout(p, q, i);
392 gz->output += i;
393 p += i;
394 siz -= i;
395 }
396 gz->output += siz;
397 return 0;
398}
399
400
401/*
402 * Tell kern_execve.c about it, with a little help from the linker.
403 */
404static struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"};
405EXEC_SET(execgzip, gzip_execsw);
| 317 (vm_offset_t *) & igz->inbuf, /* address */
318 PAGE_SIZE, /* size */
319 VM_PROT_READ, /* protection */
320 VM_PROT_READ, /* max protection */
321 0, /* flags */
322 OBJT_VNODE, /* handle type */
323 igz->ip->vp, /* vnode */
324 igz->offset); /* offset */
325 if (error) {
326 igz->where = __LINE__;
327 igz->error = error;
328 return GZ_EOF;
329 }
330 return igz->inbuf[(igz->idx++) - igz->offset];
331}
332
333static int
334Flush(void *vp, u_char * ptr, u_long siz)
335{
336 struct imgact_gzip *gz = (struct imgact_gzip *) vp;
337 u_char *p = ptr, *q;
338 int i;
339
340 /* First, find an a.out-header. */
341 if (gz->output < sizeof gz->a_out) {
342 q = (u_char *) & gz->a_out;
343 i = min(siz, sizeof gz->a_out - gz->output);
344 bcopy(p, q + gz->output, i);
345 gz->output += i;
346 p += i;
347 siz -= i;
348 if (gz->output == sizeof gz->a_out) {
349 gz->gotheader = 1;
350 i = do_aout_hdr(gz);
351 if (i == -1) {
352 if (!gz->where)
353 gz->where = __LINE__;
354 gz->error = ENOEXEC;
355 return ENOEXEC;
356 } else if (i) {
357 gz->where = __LINE__;
358 gz->error = i;
359 return ENOEXEC;
360 }
361 if (gz->file_offset == 0) {
362 q = (u_char *) (uintptr_t) gz->virtual_offset;
363 copyout(&gz->a_out, q, sizeof gz->a_out);
364 }
365 }
366 }
367 /* Skip over zero-padded first PAGE if needed */
368 if (gz->output < gz->file_offset &&
369 gz->output + siz > gz->file_offset) {
370 i = min(siz, gz->file_offset - gz->output);
371 gz->output += i;
372 p += i;
373 siz -= i;
374 }
375 if (gz->output >= gz->file_offset && gz->output < gz->file_end) {
376 i = min(siz, gz->file_end - gz->output);
377 q = (u_char *) (uintptr_t)
378 (gz->virtual_offset + gz->output - gz->file_offset);
379 copyout(p, q, i);
380 gz->output += i;
381 p += i;
382 siz -= i;
383 }
384 gz->output += siz;
385 return 0;
386}
387
388
389/*
390 * Tell kern_execve.c about it, with a little help from the linker.
391 */
392static struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"};
393EXEC_SET(execgzip, gzip_execsw);
|