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8#include <linux/module.h>
9
10#include <linux/time.h>
11#include <linux/kernel.h>
12#include <linux/mm.h>
13#include <linux/mman.h>
14#include <linux/a.out.h>
15#include <linux/errno.h>
16#include <linux/signal.h>
17#include <linux/string.h>
18#include <linux/fs.h>
19#include <linux/file.h>
20#include <linux/stat.h>
21#include <linux/fcntl.h>
22#include <linux/ptrace.h>
23#include <linux/user.h>
24#include <linux/binfmts.h>
25#include <linux/personality.h>
26#include <linux/init.h>
27#include <linux/jiffies.h>
28
29#include <asm/uaccess.h>
30#include <asm/pgalloc.h>
31#include <asm/cacheflush.h>
32#include <asm/user32.h>
33#include <asm/ia32.h>
34
35#undef WARN_OLD
36#undef CORE_DUMP
37
38static int load_aout_binary(struct linux_binprm *);
39static int load_aout_library(struct file *);
40
41#ifdef CORE_DUMP
42static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
43 unsigned long limit);
44
45
46
47
48static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
49{
50 u32 fs, gs;
51
52
53 dump->magic = CMAGIC;
54 dump->start_code = 0;
55 dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
56 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
57 dump->u_dsize = ((unsigned long)
58 (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
59 dump->u_dsize -= dump->u_tsize;
60 dump->u_ssize = 0;
61 dump->u_debugreg[0] = current->thread.debugreg0;
62 dump->u_debugreg[1] = current->thread.debugreg1;
63 dump->u_debugreg[2] = current->thread.debugreg2;
64 dump->u_debugreg[3] = current->thread.debugreg3;
65 dump->u_debugreg[4] = 0;
66 dump->u_debugreg[5] = 0;
67 dump->u_debugreg[6] = current->thread.debugreg6;
68 dump->u_debugreg[7] = current->thread.debugreg7;
69
70 if (dump->start_stack < 0xc0000000) {
71 unsigned long tmp;
72
73 tmp = (unsigned long) (0xc0000000 - dump->start_stack);
74 dump->u_ssize = tmp >> PAGE_SHIFT;
75 }
76
77 dump->regs.bx = regs->bx;
78 dump->regs.cx = regs->cx;
79 dump->regs.dx = regs->dx;
80 dump->regs.si = regs->si;
81 dump->regs.di = regs->di;
82 dump->regs.bp = regs->bp;
83 dump->regs.ax = regs->ax;
84 dump->regs.ds = current->thread.ds;
85 dump->regs.es = current->thread.es;
86 savesegment(fs, fs);
87 dump->regs.fs = fs;
88 savesegment(gs, gs);
89 dump->regs.gs = gs;
90 dump->regs.orig_ax = regs->orig_ax;
91 dump->regs.ip = regs->ip;
92 dump->regs.cs = regs->cs;
93 dump->regs.flags = regs->flags;
94 dump->regs.sp = regs->sp;
95 dump->regs.ss = regs->ss;
96
97#if 1
98 dump->u_fpvalid = 0;
99#else
100 dump->u_fpvalid = dump_fpu(regs, &dump->i387);
101#endif
102}
103
104#endif
105
106static struct linux_binfmt aout_format = {
107 .module = THIS_MODULE,
108 .load_binary = load_aout_binary,
109 .load_shlib = load_aout_library,
110#ifdef CORE_DUMP
111 .core_dump = aout_core_dump,
112#endif
113 .min_coredump = PAGE_SIZE
114};
115
116static void set_brk(unsigned long start, unsigned long end)
117{
118 start = PAGE_ALIGN(start);
119 end = PAGE_ALIGN(end);
120 if (end <= start)
121 return;
122 vm_brk(start, end - start);
123}
124
125#ifdef CORE_DUMP
126
127
128
129
130
131#include <linux/coredump.h>
132
133#define DUMP_WRITE(addr, nr) \
134 if (!dump_write(file, (void *)(addr), (nr))) \
135 goto end_coredump;
136
137#define DUMP_SEEK(offset) \
138 if (!dump_seek(file, offset)) \
139 goto end_coredump;
140
141#define START_DATA() (u.u_tsize << PAGE_SHIFT)
142#define START_STACK(u) (u.start_stack)
143
144
145
146
147
148
149
150
151
152
153
154static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
155 unsigned long limit)
156{
157 mm_segment_t fs;
158 int has_dumped = 0;
159 unsigned long dump_start, dump_size;
160 struct user32 dump;
161
162 fs = get_fs();
163 set_fs(KERNEL_DS);
164 has_dumped = 1;
165 current->flags |= PF_DUMPCORE;
166 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
167 dump.u_ar0 = offsetof(struct user32, regs);
168 dump.signal = signr;
169 dump_thread32(regs, &dump);
170
171
172
173
174
175
176 if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit)
177 dump.u_dsize = 0;
178
179
180 if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
181 dump.u_ssize = 0;
182
183
184 set_fs(USER_DS);
185 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
186 dump.u_dsize << PAGE_SHIFT))
187 dump.u_dsize = 0;
188 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
189 dump.u_ssize << PAGE_SHIFT))
190 dump.u_ssize = 0;
191
192 set_fs(KERNEL_DS);
193
194 DUMP_WRITE(&dump, sizeof(dump));
195
196 DUMP_SEEK(PAGE_SIZE);
197
198 set_fs(USER_DS);
199
200 if (dump.u_dsize != 0) {
201 dump_start = START_DATA(dump);
202 dump_size = dump.u_dsize << PAGE_SHIFT;
203 DUMP_WRITE(dump_start, dump_size);
204 }
205
206 if (dump.u_ssize != 0) {
207 dump_start = START_STACK(dump);
208 dump_size = dump.u_ssize << PAGE_SHIFT;
209 DUMP_WRITE(dump_start, dump_size);
210 }
211end_coredump:
212 set_fs(fs);
213 return has_dumped;
214}
215#endif
216
217
218
219
220
221
222static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
223{
224 u32 __user *argv, *envp, *sp;
225 int argc = bprm->argc, envc = bprm->envc;
226
227 sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
228 sp -= envc+1;
229 envp = sp;
230 sp -= argc+1;
231 argv = sp;
232 put_user((unsigned long) envp, --sp);
233 put_user((unsigned long) argv, --sp);
234 put_user(argc, --sp);
235 current->mm->arg_start = (unsigned long) p;
236 while (argc-- > 0) {
237 char c;
238
239 put_user((u32)(unsigned long)p, argv++);
240 do {
241 get_user(c, p++);
242 } while (c);
243 }
244 put_user(0, argv);
245 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
246 while (envc-- > 0) {
247 char c;
248
249 put_user((u32)(unsigned long)p, envp++);
250 do {
251 get_user(c, p++);
252 } while (c);
253 }
254 put_user(0, envp);
255 current->mm->env_end = (unsigned long) p;
256 return sp;
257}
258
259
260
261
262
263static int load_aout_binary(struct linux_binprm *bprm)
264{
265 unsigned long error, fd_offset, rlim;
266 struct pt_regs *regs = current_pt_regs();
267 struct exec ex;
268 int retval;
269
270 ex = *((struct exec *) bprm->buf);
271 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
272 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
273 N_TRSIZE(ex) || N_DRSIZE(ex) ||
274 i_size_read(file_inode(bprm->file)) <
275 ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
276 return -ENOEXEC;
277 }
278
279 fd_offset = N_TXTOFF(ex);
280
281
282
283
284
285 rlim = rlimit(RLIMIT_DATA);
286 if (rlim >= RLIM_INFINITY)
287 rlim = ~0;
288 if (ex.a_data + ex.a_bss > rlim)
289 return -ENOMEM;
290
291
292 retval = flush_old_exec(bprm);
293 if (retval)
294 return retval;
295
296
297 set_personality(PER_LINUX);
298 set_personality_ia32(false);
299
300 setup_new_exec(bprm);
301
302 regs->cs = __USER32_CS;
303 regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
304 regs->r13 = regs->r14 = regs->r15 = 0;
305
306 current->mm->end_code = ex.a_text +
307 (current->mm->start_code = N_TXTADDR(ex));
308 current->mm->end_data = ex.a_data +
309 (current->mm->start_data = N_DATADDR(ex));
310 current->mm->brk = ex.a_bss +
311 (current->mm->start_brk = N_BSSADDR(ex));
312 current->mm->free_area_cache = TASK_UNMAPPED_BASE;
313 current->mm->cached_hole_size = 0;
314
315 retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
316 if (retval < 0) {
317
318 send_sig(SIGKILL, current, 0);
319 return retval;
320 }
321
322 install_exec_creds(bprm);
323
324 if (N_MAGIC(ex) == OMAGIC) {
325 unsigned long text_addr, map_size;
326 loff_t pos;
327
328 text_addr = N_TXTADDR(ex);
329
330 pos = 32;
331 map_size = ex.a_text+ex.a_data;
332
333 error = vm_brk(text_addr & PAGE_MASK, map_size);
334
335 if (error != (text_addr & PAGE_MASK)) {
336 send_sig(SIGKILL, current, 0);
337 return error;
338 }
339
340 error = bprm->file->f_op->read(bprm->file,
341 (char __user *)text_addr,
342 ex.a_text+ex.a_data, &pos);
343 if ((signed long)error < 0) {
344 send_sig(SIGKILL, current, 0);
345 return error;
346 }
347
348 flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
349 } else {
350#ifdef WARN_OLD
351 static unsigned long error_time, error_time2;
352 if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
353 (N_MAGIC(ex) != NMAGIC) &&
354 time_after(jiffies, error_time2 + 5*HZ)) {
355 printk(KERN_NOTICE "executable not page aligned\n");
356 error_time2 = jiffies;
357 }
358
359 if ((fd_offset & ~PAGE_MASK) != 0 &&
360 time_after(jiffies, error_time + 5*HZ)) {
361 printk(KERN_WARNING
362 "fd_offset is not page aligned. Please convert "
363 "program: %s\n",
364 bprm->file->f_path.dentry->d_name.name);
365 error_time = jiffies;
366 }
367#endif
368
369 if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
370 loff_t pos = fd_offset;
371
372 vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
373 bprm->file->f_op->read(bprm->file,
374 (char __user *)N_TXTADDR(ex),
375 ex.a_text+ex.a_data, &pos);
376 flush_icache_range((unsigned long) N_TXTADDR(ex),
377 (unsigned long) N_TXTADDR(ex) +
378 ex.a_text+ex.a_data);
379 goto beyond_if;
380 }
381
382 error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
383 PROT_READ | PROT_EXEC,
384 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
385 MAP_EXECUTABLE | MAP_32BIT,
386 fd_offset);
387
388 if (error != N_TXTADDR(ex)) {
389 send_sig(SIGKILL, current, 0);
390 return error;
391 }
392
393 error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
394 PROT_READ | PROT_WRITE | PROT_EXEC,
395 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
396 MAP_EXECUTABLE | MAP_32BIT,
397 fd_offset + ex.a_text);
398 if (error != N_DATADDR(ex)) {
399 send_sig(SIGKILL, current, 0);
400 return error;
401 }
402 }
403beyond_if:
404 set_binfmt(&aout_format);
405
406 set_brk(current->mm->start_brk, current->mm->brk);
407
408 current->mm->start_stack =
409 (unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
410
411 loadsegment(fs, 0);
412 loadsegment(ds, __USER32_DS);
413 loadsegment(es, __USER32_DS);
414 load_gs_index(0);
415 (regs)->ip = ex.a_entry;
416 (regs)->sp = current->mm->start_stack;
417 (regs)->flags = 0x200;
418 (regs)->cs = __USER32_CS;
419 (regs)->ss = __USER32_DS;
420 regs->r8 = regs->r9 = regs->r10 = regs->r11 =
421 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
422 set_fs(USER_DS);
423 return 0;
424}
425
426static int load_aout_library(struct file *file)
427{
428 unsigned long bss, start_addr, len, error;
429 int retval;
430 struct exec ex;
431
432
433 retval = -ENOEXEC;
434 error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
435 if (error != sizeof(ex))
436 goto out;
437
438
439 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
440 N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
441 i_size_read(file_inode(file)) <
442 ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
443 goto out;
444 }
445
446 if (N_FLAGS(ex))
447 goto out;
448
449
450
451
452 start_addr = ex.a_entry & 0xfffff000;
453
454 if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
455 loff_t pos = N_TXTOFF(ex);
456
457#ifdef WARN_OLD
458 static unsigned long error_time;
459 if (time_after(jiffies, error_time + 5*HZ)) {
460 printk(KERN_WARNING
461 "N_TXTOFF is not page aligned. Please convert "
462 "library: %s\n",
463 file->f_path.dentry->d_name.name);
464 error_time = jiffies;
465 }
466#endif
467 vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
468
469 file->f_op->read(file, (char __user *)start_addr,
470 ex.a_text + ex.a_data, &pos);
471 flush_icache_range((unsigned long) start_addr,
472 (unsigned long) start_addr + ex.a_text +
473 ex.a_data);
474
475 retval = 0;
476 goto out;
477 }
478
479 error = vm_mmap(file, start_addr, ex.a_text + ex.a_data,
480 PROT_READ | PROT_WRITE | PROT_EXEC,
481 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
482 N_TXTOFF(ex));
483 retval = error;
484 if (error != start_addr)
485 goto out;
486
487 len = PAGE_ALIGN(ex.a_text + ex.a_data);
488 bss = ex.a_text + ex.a_data + ex.a_bss;
489 if (bss > len) {
490 error = vm_brk(start_addr + len, bss - len);
491 retval = error;
492 if (error != start_addr + len)
493 goto out;
494 }
495 retval = 0;
496out:
497 return retval;
498}
499
500static int __init init_aout_binfmt(void)
501{
502 register_binfmt(&aout_format);
503 return 0;
504}
505
506static void __exit exit_aout_binfmt(void)
507{
508 unregister_binfmt(&aout_format);
509}
510
511module_init(init_aout_binfmt);
512module_exit(exit_aout_binfmt);
513MODULE_LICENSE("GPL");
514