This source file includes following definitions.
- register_binfmt
- unregister_binfmt
- open_inode
- aout_core_dump
- sys_uselib
- create_tables
- count
- copy_strings
- setup_arg_pages
- read_exec
- flush_old_exec
- do_execve
- set_brk
- load_aout_binary
- load_aout_library
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26 #include <linux/fs.h>
27 #include <linux/sched.h>
28 #include <linux/kernel.h>
29 #include <linux/mm.h>
30 #include <linux/mman.h>
31 #include <linux/a.out.h>
32 #include <linux/errno.h>
33 #include <linux/signal.h>
34 #include <linux/string.h>
35 #include <linux/stat.h>
36 #include <linux/fcntl.h>
37 #include <linux/ptrace.h>
38 #include <linux/user.h>
39 #include <linux/malloc.h>
40 #include <linux/binfmts.h>
41 #include <linux/personality.h>
42
43 #include <asm/system.h>
44 #include <asm/segment.h>
45 #include <asm/pgtable.h>
46
47 #include <linux/config.h>
48
49 asmlinkage int sys_exit(int exit_code);
50 asmlinkage int sys_brk(unsigned long);
51
52 static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
53 static int load_aout_library(int fd);
54 static int aout_core_dump(long signr, struct pt_regs * regs);
55
56 extern void dump_thread(struct pt_regs *, struct user *);
57
58
59
60
61
62 extern struct linux_binfmt elf_format;
63
64 static struct linux_binfmt aout_format = {
65 #ifndef CONFIG_BINFMT_ELF
66 NULL, NULL, load_aout_binary, load_aout_library, aout_core_dump
67 #else
68 &elf_format, NULL, load_aout_binary, load_aout_library, aout_core_dump
69 #endif
70 };
71
72 static struct linux_binfmt *formats = &aout_format;
73
74 int register_binfmt(struct linux_binfmt * fmt)
75 {
76 struct linux_binfmt ** tmp = &formats;
77
78 if (!fmt)
79 return -EINVAL;
80 if (fmt->next)
81 return -EBUSY;
82 while (*tmp) {
83 if (fmt == *tmp)
84 return -EBUSY;
85 tmp = &(*tmp)->next;
86 }
87 *tmp = fmt;
88 return 0;
89 }
90
91 int unregister_binfmt(struct linux_binfmt * fmt)
92 {
93 struct linux_binfmt ** tmp = &formats;
94
95 while (*tmp) {
96 if (fmt == *tmp) {
97 *tmp = fmt->next;
98 return 0;
99 }
100 tmp = &(*tmp)->next;
101 }
102 return -EINVAL;
103 }
104
105 int open_inode(struct inode * inode, int mode)
106 {
107 int error, fd;
108 struct file *f, **fpp;
109
110 if (!inode->i_op || !inode->i_op->default_file_ops)
111 return -EINVAL;
112 f = get_empty_filp();
113 if (!f)
114 return -ENFILE;
115 fd = 0;
116 fpp = current->files->fd;
117 for (;;) {
118 if (!*fpp)
119 break;
120 if (++fd >= NR_OPEN) {
121 f->f_count--;
122 return -EMFILE;
123 }
124 fpp++;
125 }
126 *fpp = f;
127 f->f_flags = mode;
128 f->f_mode = (mode+1) & O_ACCMODE;
129 f->f_inode = inode;
130 f->f_pos = 0;
131 f->f_reada = 0;
132 f->f_op = inode->i_op->default_file_ops;
133 if (f->f_op->open) {
134 error = f->f_op->open(inode,f);
135 if (error) {
136 *fpp = NULL;
137 f->f_count--;
138 return error;
139 }
140 }
141 inode->i_count++;
142 return fd;
143 }
144
145
146
147
148
149 #define DUMP_WRITE(addr,nr) \
150 while (file.f_op->write(inode,&file,(char *)(addr),(nr)) != (nr)) goto close_coredump
151
152 #define DUMP_SEEK(offset) \
153 if (file.f_op->lseek) { \
154 if (file.f_op->lseek(inode,&file,(offset),0) != (offset)) \
155 goto close_coredump; \
156 } else file.f_pos = (offset)
157
158
159
160
161
162
163
164
165
166
167 static int aout_core_dump(long signr, struct pt_regs * regs)
168 {
169 struct inode * inode = NULL;
170 struct file file;
171 unsigned short fs;
172 int has_dumped = 0;
173 char corefile[6+sizeof(current->comm)];
174 unsigned long dump_start, dump_size;
175 struct user dump;
176
177 if (!current->dumpable)
178 return 0;
179 current->dumpable = 0;
180
181
182 if (current->rlim[RLIMIT_CORE].rlim_cur < PAGE_SIZE)
183 return 0;
184 fs = get_fs();
185 set_fs(KERNEL_DS);
186 memcpy(corefile,"core.",5);
187 #if 0
188 memcpy(corefile+5,current->comm,sizeof(current->comm));
189 #else
190 corefile[4] = '\0';
191 #endif
192 if (open_namei(corefile,O_CREAT | 2 | O_TRUNC,0600,&inode,NULL)) {
193 inode = NULL;
194 goto end_coredump;
195 }
196 if (!S_ISREG(inode->i_mode))
197 goto end_coredump;
198 if (!inode->i_op || !inode->i_op->default_file_ops)
199 goto end_coredump;
200 if (get_write_access(inode))
201 goto end_coredump;
202 file.f_mode = 3;
203 file.f_flags = 0;
204 file.f_count = 1;
205 file.f_inode = inode;
206 file.f_pos = 0;
207 file.f_reada = 0;
208 file.f_op = inode->i_op->default_file_ops;
209 if (file.f_op->open)
210 if (file.f_op->open(inode,&file))
211 goto done_coredump;
212 if (!file.f_op->write)
213 goto close_coredump;
214 has_dumped = 1;
215 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
216 dump.u_ar0 = (struct pt_regs *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
217 dump.signal = signr;
218 dump_thread(regs, &dump);
219
220
221
222 if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE >
223 current->rlim[RLIMIT_CORE].rlim_cur)
224 dump.u_dsize = 0;
225
226
227 if ((dump.u_ssize+1) * PAGE_SIZE >
228 current->rlim[RLIMIT_CORE].rlim_cur)
229 dump.u_ssize = 0;
230
231 set_fs(KERNEL_DS);
232
233 DUMP_WRITE(&dump,sizeof(dump));
234
235 DUMP_SEEK(PAGE_SIZE);
236
237 set_fs(USER_DS);
238
239 if (dump.u_dsize != 0) {
240 dump_start = dump.u_tsize << 12;
241 dump_size = dump.u_dsize << 12;
242 DUMP_WRITE(dump_start,dump_size);
243 }
244
245 if (dump.u_ssize != 0) {
246 dump_start = dump.start_stack;
247 dump_size = dump.u_ssize << 12;
248 DUMP_WRITE(dump_start,dump_size);
249 }
250
251 set_fs(KERNEL_DS);
252 DUMP_WRITE(current,sizeof(*current));
253 close_coredump:
254 if (file.f_op->release)
255 file.f_op->release(inode,&file);
256 done_coredump:
257 put_write_access(inode);
258 end_coredump:
259 set_fs(fs);
260 iput(inode);
261 return has_dumped;
262 }
263
264
265
266
267
268
269
270 asmlinkage int sys_uselib(const char * library)
271 {
272 int fd, retval;
273 struct file * file;
274 struct linux_binfmt * fmt;
275
276 fd = sys_open(library, 0, 0);
277 if (fd < 0)
278 return fd;
279 file = current->files->fd[fd];
280 retval = -ENOEXEC;
281 if (file && file->f_inode && file->f_op && file->f_op->read) {
282 for (fmt = formats ; fmt ; fmt = fmt->next) {
283 int (*fn)(int) = fmt->load_shlib;
284 if (!fn)
285 break;
286 retval = fn(fd);
287 if (retval != -ENOEXEC)
288 break;
289 }
290 }
291 sys_close(fd);
292 return retval;
293 }
294
295
296
297
298
299
300 unsigned long * create_tables(char * p,int argc,int envc,int ibcs)
301 {
302 unsigned long *argv,*envp;
303 unsigned long * sp;
304 struct vm_area_struct *mpnt;
305
306 mpnt = (struct vm_area_struct *)kmalloc(sizeof(*mpnt), GFP_KERNEL);
307 if (mpnt) {
308 mpnt->vm_task = current;
309 mpnt->vm_start = PAGE_MASK & (unsigned long) p;
310 mpnt->vm_end = TASK_SIZE;
311 mpnt->vm_page_prot = PAGE_COPY;
312 mpnt->vm_flags = VM_STACK_FLAGS;
313 mpnt->vm_ops = NULL;
314 mpnt->vm_offset = 0;
315 mpnt->vm_inode = NULL;
316 mpnt->vm_pte = 0;
317 insert_vm_struct(current, mpnt);
318 }
319 sp = (unsigned long *) (0xfffffffc & (unsigned long) p);
320 sp -= envc+1;
321 envp = sp;
322 sp -= argc+1;
323 argv = sp;
324 if (!ibcs) {
325 put_fs_long((unsigned long)envp,--sp);
326 put_fs_long((unsigned long)argv,--sp);
327 }
328 put_fs_long((unsigned long)argc,--sp);
329 current->mm->arg_start = (unsigned long) p;
330 while (argc-->0) {
331 put_fs_long((unsigned long) p,argv++);
332 while (get_fs_byte(p++)) ;
333 }
334 put_fs_long(0,argv);
335 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
336 while (envc-->0) {
337 put_fs_long((unsigned long) p,envp++);
338 while (get_fs_byte(p++)) ;
339 }
340 put_fs_long(0,envp);
341 current->mm->env_end = (unsigned long) p;
342 return sp;
343 }
344
345
346
347
348
349
350
351 static int count(char ** argv)
352 {
353 int error, i = 0;
354 char ** tmp, *p;
355
356 if ((tmp = argv) != NULL) {
357 error = verify_area(VERIFY_READ, tmp, sizeof(char *));
358 if (error)
359 return error;
360 while ((p = (char *) get_fs_long((unsigned long *) (tmp++))) != NULL) {
361 i++;
362 error = verify_area(VERIFY_READ, p, 1);
363 if (error)
364 return error;
365 }
366 }
367 return i;
368 }
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387 unsigned long copy_strings(int argc,char ** argv,unsigned long *page,
388 unsigned long p, int from_kmem)
389 {
390 char *tmp, *pag = NULL;
391 int len, offset = 0;
392 unsigned long old_fs, new_fs;
393
394 if (!p)
395 return 0;
396 new_fs = get_ds();
397 old_fs = get_fs();
398 if (from_kmem==2)
399 set_fs(new_fs);
400 while (argc-- > 0) {
401 if (from_kmem == 1)
402 set_fs(new_fs);
403 if (!(tmp = (char *)get_fs_long(((unsigned long *)argv)+argc)))
404 panic("VFS: argc is wrong");
405 if (from_kmem == 1)
406 set_fs(old_fs);
407 len=0;
408 do {
409 len++;
410 } while (get_fs_byte(tmp++));
411 if (p < len) {
412 set_fs(old_fs);
413 return 0;
414 }
415 while (len) {
416 --p; --tmp; --len;
417 if (--offset < 0) {
418 offset = p % PAGE_SIZE;
419 if (from_kmem==2)
420 set_fs(old_fs);
421 if (!(pag = (char *) page[p/PAGE_SIZE]) &&
422 !(pag = (char *) page[p/PAGE_SIZE] =
423 (unsigned long *) get_free_page(GFP_USER)))
424 return 0;
425 if (from_kmem==2)
426 set_fs(new_fs);
427
428 }
429 *(pag + offset) = get_fs_byte(tmp);
430 }
431 }
432 if (from_kmem==2)
433 set_fs(old_fs);
434 return p;
435 }
436
437 unsigned long setup_arg_pages(unsigned long text_size,unsigned long * page)
438 {
439 unsigned long code_limit,data_limit,code_base,data_base;
440 int i;
441
442 code_limit = TASK_SIZE;
443 data_limit = TASK_SIZE;
444 code_base = data_base = 0;
445 current->mm->start_code = code_base;
446 data_base += data_limit;
447 for (i=MAX_ARG_PAGES-1 ; i>=0 ; i--) {
448 data_base -= PAGE_SIZE;
449 if (page[i]) {
450 current->mm->rss++;
451 put_dirty_page(current,page[i],data_base);
452 }
453 }
454 return data_limit;
455 }
456
457
458
459
460
461
462 int read_exec(struct inode *inode, unsigned long offset,
463 char * addr, unsigned long count)
464 {
465 struct file file;
466 int result = -ENOEXEC;
467
468 if (!inode->i_op || !inode->i_op->default_file_ops)
469 goto end_readexec;
470 file.f_mode = 1;
471 file.f_flags = 0;
472 file.f_count = 1;
473 file.f_inode = inode;
474 file.f_pos = 0;
475 file.f_reada = 0;
476 file.f_op = inode->i_op->default_file_ops;
477 if (file.f_op->open)
478 if (file.f_op->open(inode,&file))
479 goto end_readexec;
480 if (!file.f_op || !file.f_op->read)
481 goto close_readexec;
482 if (file.f_op->lseek) {
483 if (file.f_op->lseek(inode,&file,offset,0) != offset)
484 goto close_readexec;
485 } else
486 file.f_pos = offset;
487 if (get_fs() == USER_DS) {
488 result = verify_area(VERIFY_WRITE, addr, count);
489 if (result)
490 goto close_readexec;
491 }
492 result = file.f_op->read(inode, &file, addr, count);
493 close_readexec:
494 if (file.f_op->release)
495 file.f_op->release(inode,&file);
496 end_readexec:
497 return result;
498 }
499
500
501
502
503
504
505
506 void flush_old_exec(struct linux_binprm * bprm)
507 {
508 int i;
509 int ch;
510 char * name;
511
512 current->dumpable = 1;
513 name = bprm->filename;
514 for (i=0; (ch = *(name++)) != '\0';) {
515 if (ch == '/')
516 i = 0;
517 else
518 if (i < 15)
519 current->comm[i++] = ch;
520 }
521 current->comm[i] = '\0';
522
523
524 exit_mmap(current);
525
526 flush_thread();
527
528 if (bprm->e_uid != current->euid || bprm->e_gid != current->egid ||
529 permission(bprm->inode,MAY_READ))
530 current->dumpable = 0;
531 current->signal = 0;
532 for (i=0 ; i<32 ; i++) {
533 current->sigaction[i].sa_mask = 0;
534 current->sigaction[i].sa_flags = 0;
535 if (current->sigaction[i].sa_handler != SIG_IGN)
536 current->sigaction[i].sa_handler = NULL;
537 }
538 for (i=0 ; i<NR_OPEN ; i++)
539 if (FD_ISSET(i,¤t->files->close_on_exec))
540 sys_close(i);
541 FD_ZERO(¤t->files->close_on_exec);
542 clear_page_tables(current);
543 if (last_task_used_math == current)
544 last_task_used_math = NULL;
545 current->used_math = 0;
546 }
547
548
549
550
551 int do_execve(char * filename, char ** argv, char ** envp, struct pt_regs * regs)
552 {
553 struct linux_binprm bprm;
554 struct linux_binfmt * fmt;
555 unsigned long old_fs;
556 int i;
557 int retval;
558 int sh_bang = 0;
559
560 bprm.p = PAGE_SIZE*MAX_ARG_PAGES-4;
561 for (i=0 ; i<MAX_ARG_PAGES ; i++)
562 bprm.page[i] = 0;
563 retval = open_namei(filename, 0, 0, &bprm.inode, NULL);
564 if (retval)
565 return retval;
566 bprm.filename = filename;
567 if ((bprm.argc = count(argv)) < 0)
568 return bprm.argc;
569 if ((bprm.envc = count(envp)) < 0)
570 return bprm.envc;
571
572 restart_interp:
573 if (!S_ISREG(bprm.inode->i_mode)) {
574 retval = -EACCES;
575 goto exec_error2;
576 }
577 if (IS_NOEXEC(bprm.inode)) {
578 retval = -EPERM;
579 goto exec_error2;
580 }
581 if (!bprm.inode->i_sb) {
582 retval = -EACCES;
583 goto exec_error2;
584 }
585 i = bprm.inode->i_mode;
586 if (IS_NOSUID(bprm.inode) && (((i & S_ISUID) && bprm.inode->i_uid != current->
587 euid) || ((i & S_ISGID) && !in_group_p(bprm.inode->i_gid))) && !suser()) {
588 retval = -EPERM;
589 goto exec_error2;
590 }
591
592 if (current->flags & PF_PTRACED) {
593 bprm.e_uid = current->euid;
594 bprm.e_gid = current->egid;
595 } else {
596 bprm.e_uid = (i & S_ISUID) ? bprm.inode->i_uid : current->euid;
597 bprm.e_gid = (i & S_ISGID) ? bprm.inode->i_gid : current->egid;
598 }
599 if ((retval = permission(bprm.inode, MAY_EXEC)) != 0)
600 goto exec_error2;
601 if (!(bprm.inode->i_mode & 0111) && fsuser()) {
602 retval = -EACCES;
603 goto exec_error2;
604 }
605
606 if (bprm.inode->i_wcount > 0) {
607 retval = -ETXTBSY;
608 goto exec_error2;
609 }
610 memset(bprm.buf,0,sizeof(bprm.buf));
611 old_fs = get_fs();
612 set_fs(get_ds());
613 retval = read_exec(bprm.inode,0,bprm.buf,128);
614 set_fs(old_fs);
615 if (retval < 0)
616 goto exec_error2;
617 if ((bprm.buf[0] == '#') && (bprm.buf[1] == '!') && (!sh_bang)) {
618
619
620
621
622
623 char *cp, *interp, *i_name, *i_arg;
624
625 iput(bprm.inode);
626 bprm.buf[127] = '\0';
627 if ((cp = strchr(bprm.buf, '\n')) == NULL)
628 cp = bprm.buf+127;
629 *cp = '\0';
630 while (cp > bprm.buf) {
631 cp--;
632 if ((*cp == ' ') || (*cp == '\t'))
633 *cp = '\0';
634 else
635 break;
636 }
637 for (cp = bprm.buf+2; (*cp == ' ') || (*cp == '\t'); cp++);
638 if (!cp || *cp == '\0') {
639 retval = -ENOEXEC;
640 goto exec_error1;
641 }
642 interp = i_name = cp;
643 i_arg = 0;
644 for ( ; *cp && (*cp != ' ') && (*cp != '\t'); cp++) {
645 if (*cp == '/')
646 i_name = cp+1;
647 }
648 while ((*cp == ' ') || (*cp == '\t'))
649 *cp++ = '\0';
650 if (*cp)
651 i_arg = cp;
652
653
654
655
656 if (sh_bang++ == 0) {
657 bprm.p = copy_strings(bprm.envc, envp, bprm.page, bprm.p, 0);
658 bprm.p = copy_strings(--bprm.argc, argv+1, bprm.page, bprm.p, 0);
659 }
660
661
662
663
664
665
666
667
668 bprm.p = copy_strings(1, &bprm.filename, bprm.page, bprm.p, 2);
669 bprm.argc++;
670 if (i_arg) {
671 bprm.p = copy_strings(1, &i_arg, bprm.page, bprm.p, 2);
672 bprm.argc++;
673 }
674 bprm.p = copy_strings(1, &i_name, bprm.page, bprm.p, 2);
675 bprm.argc++;
676 if (!bprm.p) {
677 retval = -E2BIG;
678 goto exec_error1;
679 }
680
681
682
683
684
685 retval = open_namei(interp, 0, 0, &bprm.inode, NULL);
686 if (retval)
687 goto exec_error1;
688 goto restart_interp;
689 }
690 if (!sh_bang) {
691 bprm.p = copy_strings(bprm.envc,envp,bprm.page,bprm.p,0);
692 bprm.p = copy_strings(bprm.argc,argv,bprm.page,bprm.p,0);
693 if (!bprm.p) {
694 retval = -E2BIG;
695 goto exec_error2;
696 }
697 }
698
699 bprm.sh_bang = sh_bang;
700 for (fmt = formats ; fmt ; fmt = fmt->next) {
701 int (*fn)(struct linux_binprm *, struct pt_regs *) = fmt->load_binary;
702 if (!fn)
703 break;
704 retval = fn(&bprm, regs);
705 if (retval >= 0) {
706 iput(bprm.inode);
707 current->did_exec = 1;
708 return retval;
709 }
710 if (retval != -ENOEXEC)
711 break;
712 }
713 exec_error2:
714 iput(bprm.inode);
715 exec_error1:
716 for (i=0 ; i<MAX_ARG_PAGES ; i++)
717 free_page(bprm.page[i]);
718 return(retval);
719 }
720
721 static void set_brk(unsigned long start, unsigned long end)
722 {
723 start = PAGE_ALIGN(start);
724 end = PAGE_ALIGN(end);
725 if (end <= start)
726 return;
727 do_mmap(NULL, start, end - start,
728 PROT_READ | PROT_WRITE | PROT_EXEC,
729 MAP_FIXED | MAP_PRIVATE, 0);
730 }
731
732
733
734
735
736
737 static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
738 {
739 struct exec ex;
740 struct file * file;
741 int fd, error;
742 unsigned long p = bprm->p;
743 unsigned long fd_offset;
744
745 ex = *((struct exec *) bprm->buf);
746 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
747 N_MAGIC(ex) != QMAGIC) ||
748 ex.a_trsize || ex.a_drsize ||
749 bprm->inode->i_size < ex.a_text+ex.a_data+ex.a_syms+N_TXTOFF(ex)) {
750 return -ENOEXEC;
751 }
752
753 current->personality = PER_LINUX;
754 fd_offset = N_TXTOFF(ex);
755 if (N_MAGIC(ex) == ZMAGIC && fd_offset != BLOCK_SIZE) {
756 printk(KERN_NOTICE "N_TXTOFF != BLOCK_SIZE. See a.out.h.\n");
757 return -ENOEXEC;
758 }
759
760 if (N_MAGIC(ex) == ZMAGIC && ex.a_text &&
761 (fd_offset < bprm->inode->i_sb->s_blocksize)) {
762 printk(KERN_NOTICE "N_TXTOFF < BLOCK_SIZE. Please convert binary.\n");
763 return -ENOEXEC;
764 }
765
766
767 flush_old_exec(bprm);
768
769 current->mm->brk = ex.a_bss +
770 (current->mm->start_brk =
771 (current->mm->end_data = ex.a_data +
772 (current->mm->end_code = ex.a_text +
773 (current->mm->start_code = N_TXTADDR(ex)))));
774 current->mm->rss = 0;
775 current->mm->mmap = NULL;
776 current->suid = current->euid = current->fsuid = bprm->e_uid;
777 current->sgid = current->egid = current->fsgid = bprm->e_gid;
778 if (N_MAGIC(ex) == OMAGIC) {
779 do_mmap(NULL, 0, ex.a_text+ex.a_data,
780 PROT_READ|PROT_WRITE|PROT_EXEC,
781 MAP_FIXED|MAP_PRIVATE, 0);
782 read_exec(bprm->inode, 32, (char *) 0, ex.a_text+ex.a_data);
783 } else {
784 if (ex.a_text & 0xfff || ex.a_data & 0xfff)
785 printk(KERN_NOTICE "executable not page aligned\n");
786
787 fd = open_inode(bprm->inode, O_RDONLY);
788
789 if (fd < 0)
790 return fd;
791 file = current->files->fd[fd];
792 if (!file->f_op || !file->f_op->mmap) {
793 sys_close(fd);
794 do_mmap(NULL, 0, ex.a_text+ex.a_data,
795 PROT_READ|PROT_WRITE|PROT_EXEC,
796 MAP_FIXED|MAP_PRIVATE, 0);
797 read_exec(bprm->inode, fd_offset,
798 (char *) N_TXTADDR(ex), ex.a_text+ex.a_data);
799 goto beyond_if;
800 }
801
802 error = do_mmap(file, N_TXTADDR(ex), ex.a_text,
803 PROT_READ | PROT_EXEC,
804 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
805 fd_offset);
806
807 if (error != N_TXTADDR(ex)) {
808 sys_close(fd);
809 send_sig(SIGKILL, current, 0);
810 return error;
811 }
812
813 error = do_mmap(file, N_TXTADDR(ex) + ex.a_text, ex.a_data,
814 PROT_READ | PROT_WRITE | PROT_EXEC,
815 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
816 fd_offset + ex.a_text);
817 sys_close(fd);
818 if (error != N_TXTADDR(ex) + ex.a_text) {
819 send_sig(SIGKILL, current, 0);
820 return error;
821 }
822 }
823 beyond_if:
824 if (current->exec_domain && current->exec_domain->use_count)
825 (*current->exec_domain->use_count)--;
826 if (current->binfmt && current->binfmt->use_count)
827 (*current->binfmt->use_count)--;
828 current->exec_domain = lookup_exec_domain(current->personality);
829 current->binfmt = &aout_format;
830 if (current->exec_domain && current->exec_domain->use_count)
831 (*current->exec_domain->use_count)++;
832 if (current->binfmt && current->binfmt->use_count)
833 (*current->binfmt->use_count)++;
834
835 set_brk(current->mm->start_brk, current->mm->brk);
836
837 p += setup_arg_pages(ex.a_text,bprm->page);
838 p -= MAX_ARG_PAGES*PAGE_SIZE;
839 p = (unsigned long)create_tables((char *)p,
840 bprm->argc, bprm->envc,
841 current->personality != PER_LINUX);
842 current->mm->start_stack = p;
843 start_thread(regs, ex.a_entry, p);
844 if (current->flags & PF_PTRACED)
845 send_sig(SIGTRAP, current, 0);
846 return 0;
847 }
848
849
850 static int load_aout_library(int fd)
851 {
852 struct file * file;
853 struct exec ex;
854 struct inode * inode;
855 unsigned int len;
856 unsigned int bss;
857 unsigned int start_addr;
858 int error;
859
860 file = current->files->fd[fd];
861 inode = file->f_inode;
862
863 set_fs(KERNEL_DS);
864 if (file->f_op->read(inode, file, (char *) &ex, sizeof(ex)) != sizeof(ex)) {
865 return -EACCES;
866 }
867 set_fs(USER_DS);
868
869
870 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || ex.a_trsize ||
871 ex.a_drsize || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
872 inode->i_size < ex.a_text+ex.a_data+ex.a_syms+N_TXTOFF(ex)) {
873 return -ENOEXEC;
874 }
875 if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) &&
876 (N_TXTOFF(ex) < inode->i_sb->s_blocksize)) {
877 printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n");
878 return -ENOEXEC;
879 }
880
881 if (N_FLAGS(ex)) return -ENOEXEC;
882
883
884
885
886 start_addr = ex.a_entry & 0xfffff000;
887
888
889 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
890 PROT_READ | PROT_WRITE | PROT_EXEC,
891 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
892 N_TXTOFF(ex));
893 if (error != start_addr)
894 return error;
895 len = PAGE_ALIGN(ex.a_text + ex.a_data);
896 bss = ex.a_text + ex.a_data + ex.a_bss;
897 if (bss > len)
898 do_mmap(NULL, start_addr + len, bss-len,
899 PROT_READ|PROT_WRITE|PROT_EXEC,
900 MAP_PRIVATE|MAP_FIXED, 0);
901 return 0;
902 }