57int
58exec_gzip_imgact(iparams)
59 struct image_params *iparams;
60{
61 int error, error2 = 0;
62 u_char *p = (u_char *) iparams->image_header;
63 struct imgact_gzip igz;
64 struct inflate infl;
65
66 /* If these four are not OK, it isn't a gzip file */
67 if (p[0] != 0x1f)
68 return -1; /* 0 Simply magic */
69 if (p[1] != 0x8b)
70 return -1; /* 1 Simply magic */
71 if (p[2] != 0x08)
72 return -1; /* 2 Compression method */
73 if (p[9] != 0x03)
74 return -1; /* 9 OS compressed on */
75
76 /*
77 * If this one contains anything but a comment or a filename marker,
78 * we don't want to chew on it
79 */
80 if (p[3] & ~(0x18))
81 return ENOEXEC; /* 3 Flags */
82
83 /* These are of no use to us */
84 /* 4-7 Timestamp */
85 /* 8 Extra flags */
86
87 bzero(&igz, sizeof igz);
88 bzero(&infl, sizeof infl);
89 infl.gz_private = (void *) &igz;
90 infl.gz_input = NextByte;
91 infl.gz_output = Flush;
92
93 igz.ip = iparams;
94 igz.idx = 10;
95
96 if (p[3] & 0x08) { /* skip a filename */
97 while (p[igz.idx++])
98 if (igz.idx >= PAGE_SIZE)
99 return ENOEXEC;
100 }
101 if (p[3] & 0x10) { /* skip a comment */
102 while (p[igz.idx++])
103 if (igz.idx >= PAGE_SIZE)
104 return ENOEXEC;
105 }
106 igz.len = igz.ip->attr->va_size;
107
108 error = inflate(&infl);
109
110 if (igz.inbuf) {
111 error2 =
112 vm_map_remove(kernel_map, (vm_offset_t) igz.inbuf,
113 (vm_offset_t) igz.inbuf + PAGE_SIZE);
114 }
115 if (igz.error || error || error2) {
116 printf("Output=%lu ", igz.output);
117 printf("Inflate_error=%d igz.error=%d error2=%d where=%d\n",
118 error, igz.error, error2, igz.where);
119 }
120 if (igz.error)
121 return igz.error;
122 if (error)
123 return ENOEXEC;
124 if (error2)
125 return error2;
126 return 0;
127}
128
129static int
130do_aout_hdr(struct imgact_gzip * gz)
131{
132 int error;
133 struct vmspace *vmspace = gz->ip->proc->p_vmspace;
134 u_long vmaddr;
135
136 /*
137 * Set file/virtual offset based on a.out variant. We do two cases:
138 * host byte order and network byte order (for NetBSD compatibility)
139 */
140 switch ((int) (gz->a_out.a_magic & 0xffff)) {
141 case ZMAGIC:
142 gz->virtual_offset = 0;
143 if (gz->a_out.a_text) {
144 gz->file_offset = NBPG;
145 } else {
146 /* Bill's "screwball mode" */
147 gz->file_offset = 0;
148 }
149 break;
150 case QMAGIC:
151 gz->virtual_offset = NBPG;
152 gz->file_offset = 0;
153 break;
154 default:
155 /* NetBSD compatibility */
156 switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) {
157 case ZMAGIC:
158 case QMAGIC:
159 gz->virtual_offset = NBPG;
160 gz->file_offset = 0;
161 break;
162 default:
163 gz->where = __LINE__;
164 return (-1);
165 }
166 }
167
168 gz->bss_size = roundup(gz->a_out.a_bss, NBPG);
169
170 /*
171 * Check various fields in header for validity/bounds.
172 */
173 if ( /* entry point must lay with text region */
174 gz->a_out.a_entry < gz->virtual_offset ||
175 gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text ||
176
177 /* text and data size must each be page rounded */
178 gz->a_out.a_text % NBPG ||
179 gz->a_out.a_data % NBPG) {
180 gz->where = __LINE__;
181 return (-1);
182 }
183 /*
184 * text/data/bss must not exceed limits
185 */
186 if ( /* text can't exceed maximum text size */
187 gz->a_out.a_text > MAXTSIZ ||
188
189 /* data + bss can't exceed maximum data size */
190 gz->a_out.a_data + gz->bss_size > MAXDSIZ ||
191
192 /* data + bss can't exceed rlimit */
193 gz->a_out.a_data + gz->bss_size >
194 gz->ip->proc->p_rlimit[RLIMIT_DATA].rlim_cur) {
195 gz->where = __LINE__;
196 return (ENOMEM);
197 }
198 /* Find out how far we should go */
199 gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data;
200
201 /* copy in arguments and/or environment from old process */
202 error = exec_extract_strings(gz->ip);
203 if (error) {
204 gz->where = __LINE__;
205 return (error);
206 }
207 /*
208 * Destroy old process VM and create a new one (with a new stack)
209 */
210 exec_new_vmspace(gz->ip);
211
212 vmaddr = gz->virtual_offset;
213
214 error = vm_mmap(&vmspace->vm_map, /* map */
215 &vmaddr,/* address */
216 gz->a_out.a_text, /* size */
217 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* protection */
218 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE,
219 MAP_ANON | MAP_FIXED, /* flags */
220 0, /* vnode */
221 0); /* offset */
222
223 if (error) {
224 gz->where = __LINE__;
225 return (error);
226 }
227 vmaddr = gz->virtual_offset + gz->a_out.a_text;
228
229 /*
230 * Map data read/write (if text is 0, assume text is in data area
231 * [Bill's screwball mode])
232 */
233
234 error = vm_mmap(&vmspace->vm_map,
235 &vmaddr,
236 gz->a_out.a_data,
237 VM_PROT_READ | VM_PROT_WRITE | (gz->a_out.a_text ? 0 : VM_PROT_EXECUTE),
238 VM_PROT_ALL, MAP_ANON | MAP_FIXED,
239 0,
240 0);
241
242 if (error) {
243 gz->where = __LINE__;
244 return (error);
245 }
246 if (gz->bss_size != 0) {
247 /*
248 * Allocate demand-zeroed area for uninitialized data "bss" = 'block
249 * started by symbol' - named after the IBM 7090 instruction of the
250 * same name.
251 */
252 vmaddr = gz->virtual_offset + gz->a_out.a_text + gz->a_out.a_data;
253 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, gz->bss_size, FALSE);
254 if (error) {
255 gz->where = __LINE__;
256 return (error);
257 }
258 }
259 /* Fill in process VM information */
260 vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT;
261 vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT;
262 vmspace->vm_taddr = (caddr_t) gz->virtual_offset;
263 vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text;
264
265 /* Fill in image_params */
266 gz->ip->interpreted = 0;
267 gz->ip->entry_addr = gz->a_out.a_entry;
268
269 gz->ip->proc->p_sysent = &aout_sysvec;
270
271 return 0;
272}
273
274static int
275NextByte(void *vp)
276{
277 int error;
278 struct imgact_gzip *igz = (struct imgact_gzip *) vp;
279
280 if (igz->idx >= igz->len) {
281 igz->where = __LINE__;
282 return GZ_EOF;
283 }
284 if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) {
285 return igz->inbuf[(igz->idx++) - igz->offset];
286 }
287 if (igz->inbuf) {
288 error = vm_map_remove(kernel_map, (vm_offset_t) igz->inbuf,
289 (vm_offset_t) igz->inbuf + PAGE_SIZE);
290 if (error) {
291 igz->where = __LINE__;
292 igz->error = error;
293 return GZ_EOF;
294 }
295 }
296 igz->offset = igz->idx & ~PAGE_MASK;
297
298 error = vm_mmap(kernel_map, /* map */
299 (vm_offset_t *) & igz->inbuf, /* address */
300 PAGE_SIZE, /* size */
301 VM_PROT_READ, /* protection */
302 VM_PROT_READ, /* max protection */
303 0, /* flags */
304 (caddr_t) igz->ip->vnodep, /* vnode */
305 igz->offset); /* offset */
306 if (error) {
307 igz->where = __LINE__;
308 igz->error = error;
309 return GZ_EOF;
310 }
311 return igz->inbuf[(igz->idx++) - igz->offset];
312}
313
314static int
315Flush(void *vp, u_char * ptr, u_long siz)
316{
317 struct imgact_gzip *gz = (struct imgact_gzip *) vp;
318 u_char *p = ptr, *q;
319 int i;
320
321 /* First, find a a.out-header */
322 if (gz->output < sizeof gz->a_out) {
323 q = (u_char *) & gz->a_out;
324 i = min(siz, sizeof gz->a_out - gz->output);
325 bcopy(p, q + gz->output, i);
326 gz->output += i;
327 p += i;
328 siz -= i;
329 if (gz->output == sizeof gz->a_out) {
330 i = do_aout_hdr(gz);
331 if (i == -1) {
332 if (!gz->where)
333 gz->where = __LINE__;
334 gz->error = ENOEXEC;
335 return ENOEXEC;
336 } else if (i) {
337 gz->where = __LINE__;
338 gz->error = i;
339 return ENOEXEC;
340 }
341 if (gz->file_offset < sizeof gz->a_out) {
342 q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset;
343 bcopy(&gz->a_out, q, sizeof gz->a_out - gz->file_offset);
344 }
345 }
346 }
347 /* Skip over zero-padded first PAGE if needed */
348 if (gz->output < gz->file_offset && (gz->output + siz) > gz->file_offset) {
349 i = min(siz, gz->file_offset - gz->output);
350 gz->output += i;
351 p += i;
352 siz -= i;
353 }
354 if (gz->output >= gz->file_offset && gz->output < gz->file_end) {
355 i = min(siz, gz->file_end - gz->output);
356 q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset;
357 bcopy(p, q, i);
358 gz->output += i;
359 p += i;
360 siz -= i;
361 }
362 gz->output += siz;
363 return 0;
364}
365
366
367/*
368 * Tell kern_execve.c about it, with a little help from the linker.
369 * Since `const' objects end up in the text segment, TEXT_SET is the
370 * correct directive to use.
371 */
372
373static const struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"};
374TEXT_SET(execsw_set, gzip_execsw);
| 55int
56exec_gzip_imgact(iparams)
57 struct image_params *iparams;
58{
59 int error, error2 = 0;
60 u_char *p = (u_char *) iparams->image_header;
61 struct imgact_gzip igz;
62 struct inflate infl;
63
64 /* If these four are not OK, it isn't a gzip file */
65 if (p[0] != 0x1f)
66 return -1; /* 0 Simply magic */
67 if (p[1] != 0x8b)
68 return -1; /* 1 Simply magic */
69 if (p[2] != 0x08)
70 return -1; /* 2 Compression method */
71 if (p[9] != 0x03)
72 return -1; /* 9 OS compressed on */
73
74 /*
75 * If this one contains anything but a comment or a filename marker,
76 * we don't want to chew on it
77 */
78 if (p[3] & ~(0x18))
79 return ENOEXEC; /* 3 Flags */
80
81 /* These are of no use to us */
82 /* 4-7 Timestamp */
83 /* 8 Extra flags */
84
85 bzero(&igz, sizeof igz);
86 bzero(&infl, sizeof infl);
87 infl.gz_private = (void *) &igz;
88 infl.gz_input = NextByte;
89 infl.gz_output = Flush;
90
91 igz.ip = iparams;
92 igz.idx = 10;
93
94 if (p[3] & 0x08) { /* skip a filename */
95 while (p[igz.idx++])
96 if (igz.idx >= PAGE_SIZE)
97 return ENOEXEC;
98 }
99 if (p[3] & 0x10) { /* skip a comment */
100 while (p[igz.idx++])
101 if (igz.idx >= PAGE_SIZE)
102 return ENOEXEC;
103 }
104 igz.len = igz.ip->attr->va_size;
105
106 error = inflate(&infl);
107
108 if (igz.inbuf) {
109 error2 =
110 vm_map_remove(kernel_map, (vm_offset_t) igz.inbuf,
111 (vm_offset_t) igz.inbuf + PAGE_SIZE);
112 }
113 if (igz.error || error || error2) {
114 printf("Output=%lu ", igz.output);
115 printf("Inflate_error=%d igz.error=%d error2=%d where=%d\n",
116 error, igz.error, error2, igz.where);
117 }
118 if (igz.error)
119 return igz.error;
120 if (error)
121 return ENOEXEC;
122 if (error2)
123 return error2;
124 return 0;
125}
126
127static int
128do_aout_hdr(struct imgact_gzip * gz)
129{
130 int error;
131 struct vmspace *vmspace = gz->ip->proc->p_vmspace;
132 u_long vmaddr;
133
134 /*
135 * Set file/virtual offset based on a.out variant. We do two cases:
136 * host byte order and network byte order (for NetBSD compatibility)
137 */
138 switch ((int) (gz->a_out.a_magic & 0xffff)) {
139 case ZMAGIC:
140 gz->virtual_offset = 0;
141 if (gz->a_out.a_text) {
142 gz->file_offset = NBPG;
143 } else {
144 /* Bill's "screwball mode" */
145 gz->file_offset = 0;
146 }
147 break;
148 case QMAGIC:
149 gz->virtual_offset = NBPG;
150 gz->file_offset = 0;
151 break;
152 default:
153 /* NetBSD compatibility */
154 switch ((int) (ntohl(gz->a_out.a_magic) & 0xffff)) {
155 case ZMAGIC:
156 case QMAGIC:
157 gz->virtual_offset = NBPG;
158 gz->file_offset = 0;
159 break;
160 default:
161 gz->where = __LINE__;
162 return (-1);
163 }
164 }
165
166 gz->bss_size = roundup(gz->a_out.a_bss, NBPG);
167
168 /*
169 * Check various fields in header for validity/bounds.
170 */
171 if ( /* entry point must lay with text region */
172 gz->a_out.a_entry < gz->virtual_offset ||
173 gz->a_out.a_entry >= gz->virtual_offset + gz->a_out.a_text ||
174
175 /* text and data size must each be page rounded */
176 gz->a_out.a_text % NBPG ||
177 gz->a_out.a_data % NBPG) {
178 gz->where = __LINE__;
179 return (-1);
180 }
181 /*
182 * text/data/bss must not exceed limits
183 */
184 if ( /* text can't exceed maximum text size */
185 gz->a_out.a_text > MAXTSIZ ||
186
187 /* data + bss can't exceed maximum data size */
188 gz->a_out.a_data + gz->bss_size > MAXDSIZ ||
189
190 /* data + bss can't exceed rlimit */
191 gz->a_out.a_data + gz->bss_size >
192 gz->ip->proc->p_rlimit[RLIMIT_DATA].rlim_cur) {
193 gz->where = __LINE__;
194 return (ENOMEM);
195 }
196 /* Find out how far we should go */
197 gz->file_end = gz->file_offset + gz->a_out.a_text + gz->a_out.a_data;
198
199 /* copy in arguments and/or environment from old process */
200 error = exec_extract_strings(gz->ip);
201 if (error) {
202 gz->where = __LINE__;
203 return (error);
204 }
205 /*
206 * Destroy old process VM and create a new one (with a new stack)
207 */
208 exec_new_vmspace(gz->ip);
209
210 vmaddr = gz->virtual_offset;
211
212 error = vm_mmap(&vmspace->vm_map, /* map */
213 &vmaddr,/* address */
214 gz->a_out.a_text, /* size */
215 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE, /* protection */
216 VM_PROT_READ | VM_PROT_EXECUTE | VM_PROT_WRITE,
217 MAP_ANON | MAP_FIXED, /* flags */
218 0, /* vnode */
219 0); /* offset */
220
221 if (error) {
222 gz->where = __LINE__;
223 return (error);
224 }
225 vmaddr = gz->virtual_offset + gz->a_out.a_text;
226
227 /*
228 * Map data read/write (if text is 0, assume text is in data area
229 * [Bill's screwball mode])
230 */
231
232 error = vm_mmap(&vmspace->vm_map,
233 &vmaddr,
234 gz->a_out.a_data,
235 VM_PROT_READ | VM_PROT_WRITE | (gz->a_out.a_text ? 0 : VM_PROT_EXECUTE),
236 VM_PROT_ALL, MAP_ANON | MAP_FIXED,
237 0,
238 0);
239
240 if (error) {
241 gz->where = __LINE__;
242 return (error);
243 }
244 if (gz->bss_size != 0) {
245 /*
246 * Allocate demand-zeroed area for uninitialized data "bss" = 'block
247 * started by symbol' - named after the IBM 7090 instruction of the
248 * same name.
249 */
250 vmaddr = gz->virtual_offset + gz->a_out.a_text + gz->a_out.a_data;
251 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, gz->bss_size, FALSE);
252 if (error) {
253 gz->where = __LINE__;
254 return (error);
255 }
256 }
257 /* Fill in process VM information */
258 vmspace->vm_tsize = gz->a_out.a_text >> PAGE_SHIFT;
259 vmspace->vm_dsize = (gz->a_out.a_data + gz->bss_size) >> PAGE_SHIFT;
260 vmspace->vm_taddr = (caddr_t) gz->virtual_offset;
261 vmspace->vm_daddr = (caddr_t) gz->virtual_offset + gz->a_out.a_text;
262
263 /* Fill in image_params */
264 gz->ip->interpreted = 0;
265 gz->ip->entry_addr = gz->a_out.a_entry;
266
267 gz->ip->proc->p_sysent = &aout_sysvec;
268
269 return 0;
270}
271
272static int
273NextByte(void *vp)
274{
275 int error;
276 struct imgact_gzip *igz = (struct imgact_gzip *) vp;
277
278 if (igz->idx >= igz->len) {
279 igz->where = __LINE__;
280 return GZ_EOF;
281 }
282 if (igz->inbuf && igz->idx < (igz->offset + PAGE_SIZE)) {
283 return igz->inbuf[(igz->idx++) - igz->offset];
284 }
285 if (igz->inbuf) {
286 error = vm_map_remove(kernel_map, (vm_offset_t) igz->inbuf,
287 (vm_offset_t) igz->inbuf + PAGE_SIZE);
288 if (error) {
289 igz->where = __LINE__;
290 igz->error = error;
291 return GZ_EOF;
292 }
293 }
294 igz->offset = igz->idx & ~PAGE_MASK;
295
296 error = vm_mmap(kernel_map, /* map */
297 (vm_offset_t *) & igz->inbuf, /* address */
298 PAGE_SIZE, /* size */
299 VM_PROT_READ, /* protection */
300 VM_PROT_READ, /* max protection */
301 0, /* flags */
302 (caddr_t) igz->ip->vnodep, /* vnode */
303 igz->offset); /* offset */
304 if (error) {
305 igz->where = __LINE__;
306 igz->error = error;
307 return GZ_EOF;
308 }
309 return igz->inbuf[(igz->idx++) - igz->offset];
310}
311
312static int
313Flush(void *vp, u_char * ptr, u_long siz)
314{
315 struct imgact_gzip *gz = (struct imgact_gzip *) vp;
316 u_char *p = ptr, *q;
317 int i;
318
319 /* First, find a a.out-header */
320 if (gz->output < sizeof gz->a_out) {
321 q = (u_char *) & gz->a_out;
322 i = min(siz, sizeof gz->a_out - gz->output);
323 bcopy(p, q + gz->output, i);
324 gz->output += i;
325 p += i;
326 siz -= i;
327 if (gz->output == sizeof gz->a_out) {
328 i = do_aout_hdr(gz);
329 if (i == -1) {
330 if (!gz->where)
331 gz->where = __LINE__;
332 gz->error = ENOEXEC;
333 return ENOEXEC;
334 } else if (i) {
335 gz->where = __LINE__;
336 gz->error = i;
337 return ENOEXEC;
338 }
339 if (gz->file_offset < sizeof gz->a_out) {
340 q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset;
341 bcopy(&gz->a_out, q, sizeof gz->a_out - gz->file_offset);
342 }
343 }
344 }
345 /* Skip over zero-padded first PAGE if needed */
346 if (gz->output < gz->file_offset && (gz->output + siz) > gz->file_offset) {
347 i = min(siz, gz->file_offset - gz->output);
348 gz->output += i;
349 p += i;
350 siz -= i;
351 }
352 if (gz->output >= gz->file_offset && gz->output < gz->file_end) {
353 i = min(siz, gz->file_end - gz->output);
354 q = (u_char *) gz->virtual_offset + gz->output - gz->file_offset;
355 bcopy(p, q, i);
356 gz->output += i;
357 p += i;
358 siz -= i;
359 }
360 gz->output += siz;
361 return 0;
362}
363
364
365/*
366 * Tell kern_execve.c about it, with a little help from the linker.
367 * Since `const' objects end up in the text segment, TEXT_SET is the
368 * correct directive to use.
369 */
370
371static const struct execsw gzip_execsw = {exec_gzip_imgact, "gzip"};
372TEXT_SET(execsw_set, gzip_execsw);
|