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1 /*
2  *  linux/fs/exec.c
3  *
4  *  Copyright (C) 1991, 1992  Linus Torvalds
5  */
6
7 /*
8  * #!-checking implemented by tytso.
9  */
10 /*
11  * Demand-loading implemented 01.12.91 - no need to read anything but
12  * the header into memory. The inode of the executable is put into
13  * "current->executable", and page faults do the actual loading. Clean.
14  *
15  * Once more I can proudly say that linux stood up to being changed: it
16  * was less than 2 hours work to get demand-loading completely implemented.
17  *
18  * Demand loading changed July 1993 by Eric Youngdale.   Use mmap instead,
19  * current->executable is only used by the procfs.  This allows a dispatch
20  * table to check for several different types  of binary formats.  We keep
21  * trying until we recognize the file or we run out of supported binary
22  * formats. 
23  */
24
25 #include <linux/config.h>
26 #include <linux/slab.h>
27 #include <linux/file.h>
28 #include <linux/mman.h>
29 #include <linux/a.out.h>
30 #include <linux/stat.h>
31 #include <linux/fcntl.h>
32 #include <linux/smp_lock.h>
33 #include <linux/init.h>
34 #include <linux/pagemap.h>
35 #include <linux/highmem.h>
36 #include <linux/spinlock.h>
37 #include <linux/key.h>
38 #include <linux/personality.h>
39 #include <linux/binfmts.h>
40 #include <linux/swap.h>
41 #include <linux/utsname.h>
42 #include <linux/module.h>
43 #include <linux/namei.h>
44 #include <linux/proc_fs.h>
45 #include <linux/ptrace.h>
46 #include <linux/mount.h>
47 #include <linux/security.h>
48 #include <linux/syscalls.h>
49 #include <linux/rmap.h>
50 #include <linux/acct.h>
51
52 #include <asm/uaccess.h>
53 #include <asm/mmu_context.h>
54
55 #ifdef CONFIG_KMOD
56 #include <linux/kmod.h>
57 #endif
58
59 int core_uses_pid;
60 char core_pattern[65] = "core";
61 /* The maximal length of core_pattern is also specified in sysctl.c */
62
63 static struct linux_binfmt *formats;
64 static DEFINE_RWLOCK(binfmt_lock);
65
66 int register_binfmt(struct linux_binfmt * fmt)
67 {
68         struct linux_binfmt ** tmp = &formats;
69
70         if (!fmt)
71                 return -EINVAL;
72         if (fmt->next)
73                 return -EBUSY;
74         write_lock(&binfmt_lock);
75         while (*tmp) {
76                 if (fmt == *tmp) {
77                         write_unlock(&binfmt_lock);
78                         return -EBUSY;
79                 }
80                 tmp = &(*tmp)->next;
81         }
82         fmt->next = formats;
83         formats = fmt;
84         write_unlock(&binfmt_lock);
85         return 0;       
86 }
87
88 EXPORT_SYMBOL(register_binfmt);
89
90 int unregister_binfmt(struct linux_binfmt * fmt)
91 {
92         struct linux_binfmt ** tmp = &formats;
93
94         write_lock(&binfmt_lock);
95         while (*tmp) {
96                 if (fmt == *tmp) {
97                         *tmp = fmt->next;
98                         write_unlock(&binfmt_lock);
99                         return 0;
100                 }
101                 tmp = &(*tmp)->next;
102         }
103         write_unlock(&binfmt_lock);
104         return -EINVAL;
105 }
106
107 EXPORT_SYMBOL(unregister_binfmt);
108
109 static inline void put_binfmt(struct linux_binfmt * fmt)
110 {
111         module_put(fmt->module);
112 }
113
114 /*
115  * Note that a shared library must be both readable and executable due to
116  * security reasons.
117  *
118  * Also note that we take the address to load from from the file itself.
119  */
120 asmlinkage long sys_uselib(const char __user * library)
121 {
122         struct file * file;
123         struct nameidata nd;
124         int error;
125
126         nd.intent.open.flags = FMODE_READ;
127         error = __user_walk(library, LOOKUP_FOLLOW|LOOKUP_OPEN, &nd);
128         if (error)
129                 goto out;
130
131         error = -EINVAL;
132         if (!S_ISREG(nd.dentry->d_inode->i_mode))
133                 goto exit;
134
135         error = permission(nd.dentry->d_inode, MAY_READ | MAY_EXEC, &nd);
136         if (error)
137                 goto exit;
138
139         file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
140         error = PTR_ERR(file);
141         if (IS_ERR(file))
142                 goto out;
143
144         error = -ENOEXEC;
145         if(file->f_op) {
146                 struct linux_binfmt * fmt;
147
148                 read_lock(&binfmt_lock);
149                 for (fmt = formats ; fmt ; fmt = fmt->next) {
150                         if (!fmt->load_shlib)
151                                 continue;
152                         if (!try_module_get(fmt->module))
153                                 continue;
154                         read_unlock(&binfmt_lock);
155                         error = fmt->load_shlib(file);
156                         read_lock(&binfmt_lock);
157                         put_binfmt(fmt);
158                         if (error != -ENOEXEC)
159                                 break;
160                 }
161                 read_unlock(&binfmt_lock);
162         }
163         fput(file);
164 out:
165         return error;
166 exit:
167         path_release(&nd);
168         goto out;
169 }
170
171 /*
172  * count() counts the number of strings in array ARGV.
173  */
174 static int count(char __user * __user * argv, int max)
175 {
176         int i = 0;
177
178         if (argv != NULL) {
179                 for (;;) {
180                         char __user * p;
181
182                         if (get_user(p, argv))
183                                 return -EFAULT;
184                         if (!p)
185                                 break;
186                         argv++;
187                         if(++i > max)
188                                 return -E2BIG;
189                         cond_resched();
190                 }
191         }
192         return i;
193 }
194
195 /*
196  * 'copy_strings()' copies argument/environment strings from user
197  * memory to free pages in kernel mem. These are in a format ready
198  * to be put directly into the top of new user memory.
199  */
200 static int copy_strings(int argc, char __user * __user * argv,
201                         struct linux_binprm *bprm)
202 {
203         struct page *kmapped_page = NULL;
204         char *kaddr = NULL;
205         int ret;
206
207         while (argc-- > 0) {
208                 char __user *str;
209                 int len;
210                 unsigned long pos;
211
212                 if (get_user(str, argv+argc) ||
213                                 !(len = strnlen_user(str, bprm->p))) {
214                         ret = -EFAULT;
215                         goto out;
216                 }
217
218                 if (bprm->p < len)  {
219                         ret = -E2BIG;
220                         goto out;
221                 }
222
223                 bprm->p -= len;
224                 /* XXX: add architecture specific overflow check here. */
225                 pos = bprm->p;
226
227                 while (len > 0) {
228                         int i, new, err;
229                         int offset, bytes_to_copy;
230                         struct page *page;
231
232                         offset = pos % PAGE_SIZE;
233                         i = pos/PAGE_SIZE;
234                         page = bprm->page[i];
235                         new = 0;
236                         if (!page) {
237                                 page = alloc_page(GFP_HIGHUSER);
238                                 bprm->page[i] = page;
239                                 if (!page) {
240                                         ret = -ENOMEM;
241                                         goto out;
242                                 }
243                                 new = 1;
244                         }
245
246                         if (page != kmapped_page) {
247                                 if (kmapped_page)
248                                         kunmap(kmapped_page);
249                                 kmapped_page = page;
250                                 kaddr = kmap(kmapped_page);
251                         }
252                         if (new && offset)
253                                 memset(kaddr, 0, offset);
254                         bytes_to_copy = PAGE_SIZE - offset;
255                         if (bytes_to_copy > len) {
256                                 bytes_to_copy = len;
257                                 if (new)
258                                         memset(kaddr+offset+len, 0,
259                                                 PAGE_SIZE-offset-len);
260                         }
261                         err = copy_from_user(kaddr+offset, str, bytes_to_copy);
262                         if (err) {
263                                 ret = -EFAULT;
264                                 goto out;
265                         }
266
267                         pos += bytes_to_copy;
268                         str += bytes_to_copy;
269                         len -= bytes_to_copy;
270                 }
271         }
272         ret = 0;
273 out:
274         if (kmapped_page)
275                 kunmap(kmapped_page);
276         return ret;
277 }
278
279 /*
280  * Like copy_strings, but get argv and its values from kernel memory.
281  */
282 int copy_strings_kernel(int argc,char ** argv, struct linux_binprm *bprm)
283 {
284         int r;
285         mm_segment_t oldfs = get_fs();
286         set_fs(KERNEL_DS);
287         r = copy_strings(argc, (char __user * __user *)argv, bprm);
288         set_fs(oldfs);
289         return r;
290 }
291
292 EXPORT_SYMBOL(copy_strings_kernel);
293
294 #ifdef CONFIG_MMU
295 /*
296  * This routine is used to map in a page into an address space: needed by
297  * execve() for the initial stack and environment pages.
298  *
299  * vma->vm_mm->mmap_sem is held for writing.
300  */
301 void install_arg_page(struct vm_area_struct *vma,
302                         struct page *page, unsigned long address)
303 {
304         struct mm_struct *mm = vma->vm_mm;
305         pgd_t * pgd;
306         pud_t * pud;
307         pmd_t * pmd;
308         pte_t * pte;
309
310         if (unlikely(anon_vma_prepare(vma)))
311                 goto out_sig;
312
313         flush_dcache_page(page);
314         pgd = pgd_offset(mm, address);
315
316         spin_lock(&mm->page_table_lock);
317         pud = pud_alloc(mm, pgd, address);
318         if (!pud)
319                 goto out;
320         pmd = pmd_alloc(mm, pud, address);
321         if (!pmd)
322                 goto out;
323         pte = pte_alloc_map(mm, pmd, address);
324         if (!pte)
325                 goto out;
326         if (!pte_none(*pte)) {
327                 pte_unmap(pte);
328                 goto out;
329         }
330         inc_mm_counter(mm, rss);
331         lru_cache_add_active(page);
332         set_pte_at(mm, address, pte, pte_mkdirty(pte_mkwrite(mk_pte(
333                                         page, vma->vm_page_prot))));
334         page_add_anon_rmap(page, vma, address);
335         pte_unmap(pte);
336         spin_unlock(&mm->page_table_lock);
337
338         /* no need for flush_tlb */
339         return;
340 out:
341         spin_unlock(&mm->page_table_lock);
342 out_sig:
343         __free_page(page);
344         force_sig(SIGKILL, current);
345 }
346
347 #define EXTRA_STACK_VM_PAGES    20      /* random */
348
349 int setup_arg_pages(struct linux_binprm *bprm,
350                     unsigned long stack_top,
351                     int executable_stack)
352 {
353         unsigned long stack_base;
354         struct vm_area_struct *mpnt;
355         struct mm_struct *mm = current->mm;
356         int i, ret;
357         long arg_size;
358
359 #ifdef CONFIG_STACK_GROWSUP
360         /* Move the argument and environment strings to the bottom of the
361          * stack space.
362          */
363         int offset, j;
364         char *to, *from;
365
366         /* Start by shifting all the pages down */
367         i = 0;
368         for (j = 0; j < MAX_ARG_PAGES; j++) {
369                 struct page *page = bprm->page[j];
370                 if (!page)
371                         continue;
372                 bprm->page[i++] = page;
373         }
374
375         /* Now move them within their pages */
376         offset = bprm->p % PAGE_SIZE;
377         to = kmap(bprm->page[0]);
378         for (j = 1; j < i; j++) {
379                 memmove(to, to + offset, PAGE_SIZE - offset);
380                 from = kmap(bprm->page[j]);
381                 memcpy(to + PAGE_SIZE - offset, from, offset);
382                 kunmap(bprm->page[j - 1]);
383                 to = from;
384         }
385         memmove(to, to + offset, PAGE_SIZE - offset);
386         kunmap(bprm->page[j - 1]);
387
388         /* Limit stack size to 1GB */
389         stack_base = current->signal->rlim[RLIMIT_STACK].rlim_max;
390         if (stack_base > (1 << 30))
391                 stack_base = 1 << 30;
392         stack_base = PAGE_ALIGN(stack_top - stack_base);
393
394         /* Adjust bprm->p to point to the end of the strings. */
395         bprm->p = stack_base + PAGE_SIZE * i - offset;
396
397         mm->arg_start = stack_base;
398         arg_size = i << PAGE_SHIFT;
399
400         /* zero pages that were copied above */
401         while (i < MAX_ARG_PAGES)
402                 bprm->page[i++] = NULL;
403 #else
404         stack_base = arch_align_stack(stack_top - MAX_ARG_PAGES*PAGE_SIZE);
405         stack_base = PAGE_ALIGN(stack_base);
406         bprm->p += stack_base;
407         mm->arg_start = bprm->p;
408         arg_size = stack_top - (PAGE_MASK & (unsigned long) mm->arg_start);
409 #endif
410
411         arg_size += EXTRA_STACK_VM_PAGES * PAGE_SIZE;
412
413         if (bprm->loader)
414                 bprm->loader += stack_base;
415         bprm->exec += stack_base;
416
417         mpnt = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
418         if (!mpnt)
419                 return -ENOMEM;
420
421         if (security_vm_enough_memory(arg_size >> PAGE_SHIFT)) {
422                 kmem_cache_free(vm_area_cachep, mpnt);
423                 return -ENOMEM;
424         }
425
426         memset(mpnt, 0, sizeof(*mpnt));
427
428         down_write(&mm->mmap_sem);
429         {
430                 mpnt->vm_mm = mm;
431 #ifdef CONFIG_STACK_GROWSUP
432                 mpnt->vm_start = stack_base;
433                 mpnt->vm_end = stack_base + arg_size;
434 #else
435                 mpnt->vm_end = stack_top;
436                 mpnt->vm_start = mpnt->vm_end - arg_size;
437 #endif
438                 /* Adjust stack execute permissions; explicitly enable
439                  * for EXSTACK_ENABLE_X, disable for EXSTACK_DISABLE_X
440                  * and leave alone (arch default) otherwise. */
441                 if (unlikely(executable_stack == EXSTACK_ENABLE_X))
442                         mpnt->vm_flags = VM_STACK_FLAGS |  VM_EXEC;
443                 else if (executable_stack == EXSTACK_DISABLE_X)
444                         mpnt->vm_flags = VM_STACK_FLAGS & ~VM_EXEC;
445                 else
446                         mpnt->vm_flags = VM_STACK_FLAGS;
447                 mpnt->vm_flags |= mm->def_flags;
448                 mpnt->vm_page_prot = protection_map[mpnt->vm_flags & 0x7];
449                 if ((ret = insert_vm_struct(mm, mpnt))) {
450                         up_write(&mm->mmap_sem);
451                         kmem_cache_free(vm_area_cachep, mpnt);
452                         return ret;
453                 }
454                 mm->stack_vm = mm->total_vm = vma_pages(mpnt);
455         }
456
457         for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
458                 struct page *page = bprm->page[i];
459                 if (page) {
460                         bprm->page[i] = NULL;
461                         install_arg_page(mpnt, page, stack_base);
462                 }
463                 stack_base += PAGE_SIZE;
464         }
465         up_write(&mm->mmap_sem);
466         
467         return 0;
468 }
469
470 EXPORT_SYMBOL(setup_arg_pages);
471
472 #define free_arg_pages(bprm) do { } while (0)
473
474 #else
475
476 static inline void free_arg_pages(struct linux_binprm *bprm)
477 {
478         int i;
479
480         for (i = 0; i < MAX_ARG_PAGES; i++) {
481                 if (bprm->page[i])
482                         __free_page(bprm->page[i]);
483                 bprm->page[i] = NULL;
484         }
485 }
486
487 #endif /* CONFIG_MMU */
488
489 struct file *open_exec(const char *name)
490 {
491         struct nameidata nd;
492         int err;
493         struct file *file;
494
495         nd.intent.open.flags = FMODE_READ;
496         err = path_lookup(name, LOOKUP_FOLLOW|LOOKUP_OPEN, &nd);
497         file = ERR_PTR(err);
498
499         if (!err) {
500                 struct inode *inode = nd.dentry->d_inode;
501                 file = ERR_PTR(-EACCES);
502                 if (!(nd.mnt->mnt_flags & MNT_NOEXEC) &&
503                     S_ISREG(inode->i_mode)) {
504                         int err = permission(inode, MAY_EXEC, &nd);
505                         if (!err && !(inode->i_mode & 0111))
506                                 err = -EACCES;
507                         file = ERR_PTR(err);
508                         if (!err) {
509                                 file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
510                                 if (!IS_ERR(file)) {
511                                         err = deny_write_access(file);
512                                         if (err) {
513                                                 fput(file);
514                                                 file = ERR_PTR(err);
515                                         }
516                                 }
517 out:
518                                 return file;
519                         }
520                 }
521                 path_release(&nd);
522         }
523         goto out;
524 }
525
526 EXPORT_SYMBOL(open_exec);
527
528 int kernel_read(struct file *file, unsigned long offset,
529         char *addr, unsigned long count)
530 {
531         mm_segment_t old_fs;
532         loff_t pos = offset;
533         int result;
534
535         old_fs = get_fs();
536         set_fs(get_ds());
537         /* The cast to a user pointer is valid due to the set_fs() */
538         result = vfs_read(file, (void __user *)addr, count, &pos);
539         set_fs(old_fs);
540         return result;
541 }
542
543 EXPORT_SYMBOL(kernel_read);
544
545 static int exec_mmap(struct mm_struct *mm)
546 {
547         struct task_struct *tsk;
548         struct mm_struct * old_mm, *active_mm;
549
550         /* Notify parent that we're no longer interested in the old VM */
551         tsk = current;
552         old_mm = current->mm;
553         mm_release(tsk, old_mm);
554
555         if (old_mm) {
556                 /*
557                  * Make sure that if there is a core dump in progress
558                  * for the old mm, we get out and die instead of going
559                  * through with the exec.  We must hold mmap_sem around
560                  * checking core_waiters and changing tsk->mm.  The
561                  * core-inducing thread will increment core_waiters for
562                  * each thread whose ->mm == old_mm.
563                  */
564                 down_read(&old_mm->mmap_sem);
565                 if (unlikely(old_mm->core_waiters)) {
566                         up_read(&old_mm->mmap_sem);
567                         return -EINTR;
568                 }
569         }
570         task_lock(tsk);
571         active_mm = tsk->active_mm;
572         tsk->mm = mm;
573         tsk->active_mm = mm;
574         activate_mm(active_mm, mm);
575         task_unlock(tsk);
576         arch_pick_mmap_layout(mm);
577         if (old_mm) {
578                 up_read(&old_mm->mmap_sem);
579                 if (active_mm != old_mm) BUG();
580                 mmput(old_mm);
581                 return 0;
582         }
583         mmdrop(active_mm);
584         return 0;
585 }
586
587 /*
588  * This function makes sure the current process has its own signal table,
589  * so that flush_signal_handlers can later reset the handlers without
590  * disturbing other processes.  (Other processes might share the signal
591  * table via the CLONE_SIGHAND option to clone().)
592  */
593 static inline int de_thread(struct task_struct *tsk)
594 {
595         struct signal_struct *sig = tsk->signal;
596         struct sighand_struct *newsighand, *oldsighand = tsk->sighand;
597         spinlock_t *lock = &oldsighand->siglock;
598         int count;
599
600         /*
601          * If we don't share sighandlers, then we aren't sharing anything
602          * and we can just re-use it all.
603          */
604         if (atomic_read(&oldsighand->count) <= 1) {
605                 BUG_ON(atomic_read(&sig->count) != 1);
606                 exit_itimers(sig);
607                 return 0;
608         }
609
610         newsighand = kmem_cache_alloc(sighand_cachep, GFP_KERNEL);
611         if (!newsighand)
612                 return -ENOMEM;
613
614         if (thread_group_empty(current))
615                 goto no_thread_group;
616
617         /*
618          * Kill all other threads in the thread group.
619          * We must hold tasklist_lock to call zap_other_threads.
620          */
621         read_lock(&tasklist_lock);
622         spin_lock_irq(lock);
623         if (sig->flags & SIGNAL_GROUP_EXIT) {
624                 /*
625                  * Another group action in progress, just
626                  * return so that the signal is processed.
627                  */
628                 spin_unlock_irq(lock);
629                 read_unlock(&tasklist_lock);
630                 kmem_cache_free(sighand_cachep, newsighand);
631                 return -EAGAIN;
632         }
633         zap_other_threads(current);
634         read_unlock(&tasklist_lock);
635
636         /*
637          * Account for the thread group leader hanging around:
638          */
639         count = 2;
640         if (thread_group_leader(current))
641                 count = 1;
642         while (atomic_read(&sig->count) > count) {
643                 sig->group_exit_task = current;
644                 sig->notify_count = count;
645                 __set_current_state(TASK_UNINTERRUPTIBLE);
646                 spin_unlock_irq(lock);
647                 schedule();
648                 spin_lock_irq(lock);
649         }
650         sig->group_exit_task = NULL;
651         sig->notify_count = 0;
652         sig->real_timer.data = (unsigned long)current;
653         spin_unlock_irq(lock);
654
655         /*
656          * At this point all other threads have exited, all we have to
657          * do is to wait for the thread group leader to become inactive,
658          * and to assume its PID:
659          */
660         if (!thread_group_leader(current)) {
661                 struct task_struct *leader = current->group_leader, *parent;
662                 struct dentry *proc_dentry1, *proc_dentry2;
663                 unsigned long exit_state, ptrace;
664
665                 /*
666                  * Wait for the thread group leader to be a zombie.
667                  * It should already be zombie at this point, most
668                  * of the time.
669                  */
670                 while (leader->exit_state != EXIT_ZOMBIE)
671                         yield();
672
673                 spin_lock(&leader->proc_lock);
674                 spin_lock(&current->proc_lock);
675                 proc_dentry1 = proc_pid_unhash(current);
676                 proc_dentry2 = proc_pid_unhash(leader);
677                 write_lock_irq(&tasklist_lock);
678
679                 BUG_ON(leader->tgid != current->tgid);
680                 BUG_ON(current->pid == current->tgid);
681                 /*
682                  * An exec() starts a new thread group with the
683                  * TGID of the previous thread group. Rehash the
684                  * two threads with a switched PID, and release
685                  * the former thread group leader:
686                  */
687                 ptrace = leader->ptrace;
688                 parent = leader->parent;
689                 if (unlikely(ptrace) && unlikely(parent == current)) {
690                         /*
691                          * Joker was ptracing his own group leader,
692                          * and now he wants to be his own parent!
693                          * We can't have that.
694                          */
695                         ptrace = 0;
696                 }
697
698                 ptrace_unlink(current);
699                 ptrace_unlink(leader);
700                 remove_parent(current);
701                 remove_parent(leader);
702
703                 switch_exec_pids(leader, current);
704
705                 current->parent = current->real_parent = leader->real_parent;
706                 leader->parent = leader->real_parent = child_reaper;
707                 current->group_leader = current;
708                 leader->group_leader = leader;
709
710                 add_parent(current, current->parent);
711                 add_parent(leader, leader->parent);
712                 if (ptrace) {
713                         current->ptrace = ptrace;
714                         __ptrace_link(current, parent);
715                 }
716
717                 list_del(&current->tasks);
718                 list_add_tail(&current->tasks, &init_task.tasks);
719                 current->exit_signal = SIGCHLD;
720                 exit_state = leader->exit_state;
721
722                 write_unlock_irq(&tasklist_lock);
723                 spin_unlock(&leader->proc_lock);
724                 spin_unlock(&current->proc_lock);
725                 proc_pid_flush(proc_dentry1);
726                 proc_pid_flush(proc_dentry2);
727
728                 BUG_ON(exit_state != EXIT_ZOMBIE);
729                 release_task(leader);
730         }
731
732         /*
733          * Now there are really no other threads at all,
734          * so it's safe to stop telling them to kill themselves.
735          */
736         sig->flags = 0;
737
738 no_thread_group:
739         BUG_ON(atomic_read(&sig->count) != 1);
740         exit_itimers(sig);
741
742         if (atomic_read(&oldsighand->count) == 1) {
743                 /*
744                  * Now that we nuked the rest of the thread group,
745                  * it turns out we are not sharing sighand any more either.
746                  * So we can just keep it.
747                  */
748                 kmem_cache_free(sighand_cachep, newsighand);
749         } else {
750                 /*
751                  * Move our state over to newsighand and switch it in.
752                  */
753                 spin_lock_init(&newsighand->siglock);
754                 atomic_set(&newsighand->count, 1);
755                 memcpy(newsighand->action, oldsighand->action,
756                        sizeof(newsighand->action));
757
758                 write_lock_irq(&tasklist_lock);
759                 spin_lock(&oldsighand->siglock);
760                 spin_lock(&newsighand->siglock);
761
762                 current->sighand = newsighand;
763                 recalc_sigpending();
764
765                 spin_unlock(&newsighand->siglock);
766                 spin_unlock(&oldsighand->siglock);
767                 write_unlock_irq(&tasklist_lock);
768
769                 if (atomic_dec_and_test(&oldsighand->count))
770                         kmem_cache_free(sighand_cachep, oldsighand);
771         }
772
773         BUG_ON(!thread_group_empty(current));
774         BUG_ON(!thread_group_leader(current));
775         return 0;
776 }
777         
778 /*
779  * These functions flushes out all traces of the currently running executable
780  * so that a new one can be started
781  */
782
783 static inline void flush_old_files(struct files_struct * files)
784 {
785         long j = -1;
786
787         spin_lock(&files->file_lock);
788         for (;;) {
789                 unsigned long set, i;
790
791                 j++;
792                 i = j * __NFDBITS;
793                 if (i >= files->max_fds || i >= files->max_fdset)
794                         break;
795                 set = files->close_on_exec->fds_bits[j];
796                 if (!set)
797                         continue;
798                 files->close_on_exec->fds_bits[j] = 0;
799                 spin_unlock(&files->file_lock);
800                 for ( ; set ; i++,set >>= 1) {
801                         if (set & 1) {
802                                 sys_close(i);
803                         }
804                 }
805                 spin_lock(&files->file_lock);
806
807         }
808         spin_unlock(&files->file_lock);
809 }
810
811 void get_task_comm(char *buf, struct task_struct *tsk)
812 {
813         /* buf must be at least sizeof(tsk->comm) in size */
814         task_lock(tsk);
815         strncpy(buf, tsk->comm, sizeof(tsk->comm));
816         task_unlock(tsk);
817 }
818
819 void set_task_comm(struct task_struct *tsk, char *buf)
820 {
821         task_lock(tsk);
822         strlcpy(tsk->comm, buf, sizeof(tsk->comm));
823         task_unlock(tsk);
824 }
825
826 int flush_old_exec(struct linux_binprm * bprm)
827 {
828         char * name;
829         int i, ch, retval;
830         struct files_struct *files;
831         char tcomm[sizeof(current->comm)];
832
833         /*
834          * Make sure we have a private signal table and that
835          * we are unassociated from the previous thread group.
836          */
837         retval = de_thread(current);
838         if (retval)
839                 goto out;
840
841         /*
842          * Make sure we have private file handles. Ask the
843          * fork helper to do the work for us and the exit
844          * helper to do the cleanup of the old one.
845          */
846         files = current->files;         /* refcounted so safe to hold */
847         retval = unshare_files();
848         if (retval)
849                 goto out;
850         /*
851          * Release all of the old mmap stuff
852          */
853         retval = exec_mmap(bprm->mm);
854         if (retval)
855                 goto mmap_failed;
856
857         bprm->mm = NULL;                /* We're using it now */
858
859         /* This is the point of no return */
860         steal_locks(files);
861         put_files_struct(files);
862
863         current->sas_ss_sp = current->sas_ss_size = 0;
864
865         if (current->euid == current->uid && current->egid == current->gid)
866                 current->mm->dumpable = 1;
867         name = bprm->filename;
868
869         /* Copies the binary name from after last slash */
870         for (i=0; (ch = *(name++)) != '\0';) {
871                 if (ch == '/')
872                         i = 0; /* overwrite what we wrote */
873                 else
874                         if (i < (sizeof(tcomm) - 1))
875                                 tcomm[i++] = ch;
876         }
877         tcomm[i] = '\0';
878         set_task_comm(current, tcomm);
879
880         current->flags &= ~PF_RANDOMIZE;
881         flush_thread();
882
883         if (bprm->e_uid != current->euid || bprm->e_gid != current->egid || 
884             permission(bprm->file->f_dentry->d_inode,MAY_READ, NULL) ||
885             (bprm->interp_flags & BINPRM_FLAGS_ENFORCE_NONDUMP)) {
886                 suid_keys(current);
887                 current->mm->dumpable = 0;
888         }
889
890         /* An exec changes our domain. We are no longer part of the thread
891            group */
892
893         current->self_exec_id++;
894                         
895         flush_signal_handlers(current, 0);
896         flush_old_files(current->files);
897
898         return 0;
899
900 mmap_failed:
901         put_files_struct(current->files);
902         current->files = files;
903 out:
904         return retval;
905 }
906
907 EXPORT_SYMBOL(flush_old_exec);
908
909 /* 
910  * Fill the binprm structure from the inode. 
911  * Check permissions, then read the first 128 (BINPRM_BUF_SIZE) bytes
912  */
913 int prepare_binprm(struct linux_binprm *bprm)
914 {
915         int mode;
916         struct inode * inode = bprm->file->f_dentry->d_inode;
917         int retval;
918
919         mode = inode->i_mode;
920         /*
921          * Check execute perms again - if the caller has CAP_DAC_OVERRIDE,
922          * generic_permission lets a non-executable through
923          */
924         if (!(mode & 0111))     /* with at least _one_ execute bit set */
925                 return -EACCES;
926         if (bprm->file->f_op == NULL)
927                 return -EACCES;
928
929         bprm->e_uid = current->euid;
930         bprm->e_gid = current->egid;
931
932         if(!(bprm->file->f_vfsmnt->mnt_flags & MNT_NOSUID)) {
933                 /* Set-uid? */
934                 if (mode & S_ISUID) {
935                         current->personality &= ~PER_CLEAR_ON_SETID;
936                         bprm->e_uid = inode->i_uid;
937                 }
938
939                 /* Set-gid? */
940                 /*
941                  * If setgid is set but no group execute bit then this
942                  * is a candidate for mandatory locking, not a setgid
943                  * executable.
944                  */
945                 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
946                         current->personality &= ~PER_CLEAR_ON_SETID;
947                         bprm->e_gid = inode->i_gid;
948                 }
949         }
950
951         /* fill in binprm security blob */
952         retval = security_bprm_set(bprm);
953         if (retval)
954                 return retval;
955
956         memset(bprm->buf,0,BINPRM_BUF_SIZE);
957         return kernel_read(bprm->file,0,bprm->buf,BINPRM_BUF_SIZE);
958 }
959
960 EXPORT_SYMBOL(prepare_binprm);
961
962 static inline int unsafe_exec(struct task_struct *p)
963 {
964         int unsafe = 0;
965         if (p->ptrace & PT_PTRACED) {
966                 if (p->ptrace & PT_PTRACE_CAP)
967                         unsafe |= LSM_UNSAFE_PTRACE_CAP;
968                 else
969                         unsafe |= LSM_UNSAFE_PTRACE;
970         }
971         if (atomic_read(&p->fs->count) > 1 ||
972             atomic_read(&p->files->count) > 1 ||
973             atomic_read(&p->sighand->count) > 1)
974                 unsafe |= LSM_UNSAFE_SHARE;
975
976         return unsafe;
977 }
978
979 void compute_creds(struct linux_binprm *bprm)
980 {
981         int unsafe;
982
983         if (bprm->e_uid != current->uid)
984                 suid_keys(current);
985         exec_keys(current);
986
987         task_lock(current);
988         unsafe = unsafe_exec(current);
989         security_bprm_apply_creds(bprm, unsafe);
990         task_unlock(current);
991         security_bprm_post_apply_creds(bprm);
992 }
993
994 EXPORT_SYMBOL(compute_creds);
995
996 void remove_arg_zero(struct linux_binprm *bprm)
997 {
998         if (bprm->argc) {
999                 unsigned long offset;
1000                 char * kaddr;
1001                 struct page *page;
1002
1003                 offset = bprm->p % PAGE_SIZE;
1004                 goto inside;
1005
1006                 while (bprm->p++, *(kaddr+offset++)) {
1007                         if (offset != PAGE_SIZE)
1008                                 continue;
1009                         offset = 0;
1010                         kunmap_atomic(kaddr, KM_USER0);
1011 inside:
1012                         page = bprm->page[bprm->p/PAGE_SIZE];
1013                         kaddr = kmap_atomic(page, KM_USER0);
1014                 }
1015                 kunmap_atomic(kaddr, KM_USER0);
1016                 bprm->argc--;
1017         }
1018 }
1019
1020 EXPORT_SYMBOL(remove_arg_zero);
1021
1022 /*
1023  * cycle the list of binary formats handler, until one recognizes the image
1024  */
1025 int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs)
1026 {
1027         int try,retval;
1028         struct linux_binfmt *fmt;
1029 #ifdef __alpha__
1030         /* handle /sbin/loader.. */
1031         {
1032             struct exec * eh = (struct exec *) bprm->buf;
1033
1034             if (!bprm->loader && eh->fh.f_magic == 0x183 &&
1035                 (eh->fh.f_flags & 0x3000) == 0x3000)
1036             {
1037                 struct file * file;
1038                 unsigned long loader;
1039
1040                 allow_write_access(bprm->file);
1041                 fput(bprm->file);
1042                 bprm->file = NULL;
1043
1044                 loader = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1045
1046                 file = open_exec("/sbin/loader");
1047                 retval = PTR_ERR(file);
1048                 if (IS_ERR(file))
1049                         return retval;
1050
1051                 /* Remember if the application is TASO.  */
1052                 bprm->sh_bang = eh->ah.entry < 0x100000000UL;
1053
1054                 bprm->file = file;
1055                 bprm->loader = loader;
1056                 retval = prepare_binprm(bprm);
1057                 if (retval<0)
1058                         return retval;
1059                 /* should call search_binary_handler recursively here,
1060                    but it does not matter */
1061             }
1062         }
1063 #endif
1064         retval = security_bprm_check(bprm);
1065         if (retval)
1066                 return retval;
1067
1068         /* kernel module loader fixup */
1069         /* so we don't try to load run modprobe in kernel space. */
1070         set_fs(USER_DS);
1071         retval = -ENOENT;
1072         for (try=0; try<2; try++) {
1073                 read_lock(&binfmt_lock);
1074                 for (fmt = formats ; fmt ; fmt = fmt->next) {
1075                         int (*fn)(struct linux_binprm *, struct pt_regs *) = fmt->load_binary;
1076                         if (!fn)
1077                                 continue;
1078                         if (!try_module_get(fmt->module))
1079                                 continue;
1080                         read_unlock(&binfmt_lock);
1081                         retval = fn(bprm, regs);
1082                         if (retval >= 0) {
1083                                 put_binfmt(fmt);
1084                                 allow_write_access(bprm->file);
1085                                 if (bprm->file)
1086                                         fput(bprm->file);
1087                                 bprm->file = NULL;
1088                                 current->did_exec = 1;
1089                                 return retval;
1090                         }
1091                         read_lock(&binfmt_lock);
1092                         put_binfmt(fmt);
1093                         if (retval != -ENOEXEC || bprm->mm == NULL)
1094                                 break;
1095                         if (!bprm->file) {
1096                                 read_unlock(&binfmt_lock);
1097                                 return retval;
1098                         }
1099                 }
1100                 read_unlock(&binfmt_lock);
1101                 if (retval != -ENOEXEC || bprm->mm == NULL) {
1102                         break;
1103 #ifdef CONFIG_KMOD
1104                 }else{
1105 #define printable(c) (((c)=='\t') || ((c)=='\n') || (0x20<=(c) && (c)<=0x7e))
1106                         if (printable(bprm->buf[0]) &&
1107                             printable(bprm->buf[1]) &&
1108                             printable(bprm->buf[2]) &&
1109                             printable(bprm->buf[3]))
1110                                 break; /* -ENOEXEC */
1111                         request_module("binfmt-%04x", *(unsigned short *)(&bprm->buf[2]));
1112 #endif
1113                 }
1114         }
1115         return retval;
1116 }
1117
1118 EXPORT_SYMBOL(search_binary_handler);
1119
1120 /*
1121  * sys_execve() executes a new program.
1122  */
1123 int do_execve(char * filename,
1124         char __user *__user *argv,
1125         char __user *__user *envp,
1126         struct pt_regs * regs)
1127 {
1128         struct linux_binprm *bprm;
1129         struct file *file;
1130         int retval;
1131         int i;
1132
1133         retval = -ENOMEM;
1134         bprm = kmalloc(sizeof(*bprm), GFP_KERNEL);
1135         if (!bprm)
1136                 goto out_ret;
1137         memset(bprm, 0, sizeof(*bprm));
1138
1139         file = open_exec(filename);
1140         retval = PTR_ERR(file);
1141         if (IS_ERR(file))
1142                 goto out_kfree;
1143
1144         sched_exec();
1145
1146         bprm->p = PAGE_SIZE*MAX_ARG_PAGES-sizeof(void *);
1147
1148         bprm->file = file;
1149         bprm->filename = filename;
1150         bprm->interp = filename;
1151         bprm->mm = mm_alloc();
1152         retval = -ENOMEM;
1153         if (!bprm->mm)
1154                 goto out_file;
1155
1156         retval = init_new_context(current, bprm->mm);
1157         if (retval < 0)
1158                 goto out_mm;
1159
1160         bprm->argc = count(argv, bprm->p / sizeof(void *));
1161         if ((retval = bprm->argc) < 0)
1162                 goto out_mm;
1163
1164         bprm->envc = count(envp, bprm->p / sizeof(void *));
1165         if ((retval = bprm->envc) < 0)
1166                 goto out_mm;
1167
1168         retval = security_bprm_alloc(bprm);
1169         if (retval)
1170                 goto out;
1171
1172         retval = prepare_binprm(bprm);
1173         if (retval < 0)
1174                 goto out;
1175
1176         retval = copy_strings_kernel(1, &bprm->filename, bprm);
1177         if (retval < 0)
1178                 goto out;
1179
1180         bprm->exec = bprm->p;
1181         retval = copy_strings(bprm->envc, envp, bprm);
1182         if (retval < 0)
1183                 goto out;
1184
1185         retval = copy_strings(bprm->argc, argv, bprm);
1186         if (retval < 0)
1187                 goto out;
1188
1189         retval = search_binary_handler(bprm,regs);
1190         if (retval >= 0) {
1191                 free_arg_pages(bprm);
1192
1193                 /* execve success */
1194                 security_bprm_free(bprm);
1195                 acct_update_integrals(current);
1196                 update_mem_hiwater(current);
1197                 kfree(bprm);
1198                 return retval;
1199         }
1200
1201 out:
1202         /* Something went wrong, return the inode and free the argument pages*/
1203         for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
1204                 struct page * page = bprm->page[i];
1205                 if (page)
1206                         __free_page(page);
1207         }
1208
1209         if (bprm->security)
1210                 security_bprm_free(bprm);
1211
1212 out_mm:
1213         if (bprm->mm)
1214                 mmdrop(bprm->mm);
1215
1216 out_file:
1217         if (bprm->file) {
1218                 allow_write_access(bprm->file);
1219                 fput(bprm->file);
1220         }
1221
1222 out_kfree:
1223         kfree(bprm);
1224
1225 out_ret:
1226         return retval;
1227 }
1228
1229 int set_binfmt(struct linux_binfmt *new)
1230 {
1231         struct linux_binfmt *old = current->binfmt;
1232
1233         if (new) {
1234                 if (!try_module_get(new->module))
1235                         return -1;
1236         }
1237         current->binfmt = new;
1238         if (old)
1239                 module_put(old->module);
1240         return 0;
1241 }
1242
1243 EXPORT_SYMBOL(set_binfmt);
1244
1245 #define CORENAME_MAX_SIZE 64
1246
1247 /* format_corename will inspect the pattern parameter, and output a
1248  * name into corename, which must have space for at least
1249  * CORENAME_MAX_SIZE bytes plus one byte for the zero terminator.
1250  */
1251 static void format_corename(char *corename, const char *pattern, long signr)
1252 {
1253         const char *pat_ptr = pattern;
1254         char *out_ptr = corename;
1255         char *const out_end = corename + CORENAME_MAX_SIZE;
1256         int rc;
1257         int pid_in_pattern = 0;
1258
1259         /* Repeat as long as we have more pattern to process and more output
1260            space */
1261         while (*pat_ptr) {
1262                 if (*pat_ptr != '%') {
1263                         if (out_ptr == out_end)
1264                                 goto out;
1265                         *out_ptr++ = *pat_ptr++;
1266                 } else {
1267                         switch (*++pat_ptr) {
1268                         case 0:
1269                                 goto out;
1270                         /* Double percent, output one percent */
1271                         case '%':
1272                                 if (out_ptr == out_end)
1273                                         goto out;
1274                                 *out_ptr++ = '%';
1275                                 break;
1276                         /* pid */
1277                         case 'p':
1278                                 pid_in_pattern = 1;
1279                                 rc = snprintf(out_ptr, out_end - out_ptr,
1280                                               "%d", current->tgid);
1281                                 if (rc > out_end - out_ptr)
1282                                         goto out;
1283                                 out_ptr += rc;
1284                                 break;
1285                         /* uid */
1286                         case 'u':
1287                                 rc = snprintf(out_ptr, out_end - out_ptr,
1288                                               "%d", current->uid);
1289                                 if (rc > out_end - out_ptr)
1290                                         goto out;
1291                                 out_ptr += rc;
1292                                 break;
1293                         /* gid */
1294                         case 'g':
1295                                 rc = snprintf(out_ptr, out_end - out_ptr,
1296                                               "%d", current->gid);
1297                                 if (rc > out_end - out_ptr)
1298                                         goto out;
1299                                 out_ptr += rc;
1300                                 break;
1301                         /* signal that caused the coredump */
1302                         case 's':
1303                                 rc = snprintf(out_ptr, out_end - out_ptr,
1304                                               "%ld", signr);
1305                                 if (rc > out_end - out_ptr)
1306                                         goto out;
1307                                 out_ptr += rc;
1308                                 break;
1309                         /* UNIX time of coredump */
1310                         case 't': {
1311                                 struct timeval tv;
1312                                 do_gettimeofday(&tv);
1313                                 rc = snprintf(out_ptr, out_end - out_ptr,
1314                                               "%lu", tv.tv_sec);
1315                                 if (rc > out_end - out_ptr)
1316                                         goto out;
1317                                 out_ptr += rc;
1318                                 break;
1319                         }
1320                         /* hostname */
1321                         case 'h':
1322                                 down_read(&uts_sem);
1323                                 rc = snprintf(out_ptr, out_end - out_ptr,
1324                                               "%s", system_utsname.nodename);
1325                                 up_read(&uts_sem);
1326                                 if (rc > out_end - out_ptr)
1327                                         goto out;
1328                                 out_ptr += rc;
1329                                 break;
1330                         /* executable */
1331                         case 'e':
1332                                 rc = snprintf(out_ptr, out_end - out_ptr,
1333                                               "%s", current->comm);
1334                                 if (rc > out_end - out_ptr)
1335                                         goto out;
1336                                 out_ptr += rc;
1337                                 break;
1338                         default:
1339                                 break;
1340                         }
1341                         ++pat_ptr;
1342                 }
1343         }
1344         /* Backward compatibility with core_uses_pid:
1345          *
1346          * If core_pattern does not include a %p (as is the default)
1347          * and core_uses_pid is set, then .%pid will be appended to
1348          * the filename */
1349         if (!pid_in_pattern
1350             && (core_uses_pid || atomic_read(&current->mm->mm_users) != 1)) {
1351                 rc = snprintf(out_ptr, out_end - out_ptr,
1352                               ".%d", current->tgid);
1353                 if (rc > out_end - out_ptr)
1354                         goto out;
1355                 out_ptr += rc;
1356         }
1357       out:
1358         *out_ptr = 0;
1359 }
1360
1361 static void zap_threads (struct mm_struct *mm)
1362 {
1363         struct task_struct *g, *p;
1364         struct task_struct *tsk = current;
1365         struct completion *vfork_done = tsk->vfork_done;
1366         int traced = 0;
1367
1368         /*
1369          * Make sure nobody is waiting for us to release the VM,
1370          * otherwise we can deadlock when we wait on each other
1371          */
1372         if (vfork_done) {
1373                 tsk->vfork_done = NULL;
1374                 complete(vfork_done);
1375         }
1376
1377         read_lock(&tasklist_lock);
1378         do_each_thread(g,p)
1379                 if (mm == p->mm && p != tsk) {
1380                         force_sig_specific(SIGKILL, p);
1381                         mm->core_waiters++;
1382                         if (unlikely(p->ptrace) &&
1383                             unlikely(p->parent->mm == mm))
1384                                 traced = 1;
1385                 }
1386         while_each_thread(g,p);
1387
1388         read_unlock(&tasklist_lock);
1389
1390         if (unlikely(traced)) {
1391                 /*
1392                  * We are zapping a thread and the thread it ptraces.
1393                  * If the tracee went into a ptrace stop for exit tracing,
1394                  * we could deadlock since the tracer is waiting for this
1395                  * coredump to finish.  Detach them so they can both die.
1396                  */
1397                 write_lock_irq(&tasklist_lock);
1398                 do_each_thread(g,p) {
1399                         if (mm == p->mm && p != tsk &&
1400                             p->ptrace && p->parent->mm == mm) {
1401                                 __ptrace_unlink(p);
1402                         }
1403                 } while_each_thread(g,p);
1404                 write_unlock_irq(&tasklist_lock);
1405         }
1406 }
1407
1408 static void coredump_wait(struct mm_struct *mm)
1409 {
1410         DECLARE_COMPLETION(startup_done);
1411
1412         mm->core_waiters++; /* let other threads block */
1413         mm->core_startup_done = &startup_done;
1414
1415         /* give other threads a chance to run: */
1416         yield();
1417
1418         zap_threads(mm);
1419         if (--mm->core_waiters) {
1420                 up_write(&mm->mmap_sem);
1421                 wait_for_completion(&startup_done);
1422         } else
1423                 up_write(&mm->mmap_sem);
1424         BUG_ON(mm->core_waiters);
1425 }
1426
1427 int do_coredump(long signr, int exit_code, struct pt_regs * regs)
1428 {
1429         char corename[CORENAME_MAX_SIZE + 1];
1430         struct mm_struct *mm = current->mm;
1431         struct linux_binfmt * binfmt;
1432         struct inode * inode;
1433         struct file * file;
1434         int retval = 0;
1435
1436         binfmt = current->binfmt;
1437         if (!binfmt || !binfmt->core_dump)
1438                 goto fail;
1439         down_write(&mm->mmap_sem);
1440         if (!mm->dumpable) {
1441                 up_write(&mm->mmap_sem);
1442                 goto fail;
1443         }
1444         mm->dumpable = 0;
1445         init_completion(&mm->core_done);
1446         spin_lock_irq(&current->sighand->siglock);
1447         current->signal->flags = SIGNAL_GROUP_EXIT;
1448         current->signal->group_exit_code = exit_code;
1449         spin_unlock_irq(&current->sighand->siglock);
1450         coredump_wait(mm);
1451
1452         /*
1453          * Clear any false indication of pending signals that might
1454          * be seen by the filesystem code called to write the core file.
1455          */
1456         current->signal->group_stop_count = 0;
1457         clear_thread_flag(TIF_SIGPENDING);
1458
1459         if (current->signal->rlim[RLIMIT_CORE].rlim_cur < binfmt->min_coredump)
1460                 goto fail_unlock;
1461
1462         /*
1463          * lock_kernel() because format_corename() is controlled by sysctl, which
1464          * uses lock_kernel()
1465          */
1466         lock_kernel();
1467         format_corename(corename, core_pattern, signr);
1468         unlock_kernel();
1469         file = filp_open(corename, O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE, 0600);
1470         if (IS_ERR(file))
1471                 goto fail_unlock;
1472         inode = file->f_dentry->d_inode;
1473         if (inode->i_nlink > 1)
1474                 goto close_fail;        /* multiple links - don't dump */
1475         if (d_unhashed(file->f_dentry))
1476                 goto close_fail;
1477
1478         if (!S_ISREG(inode->i_mode))
1479                 goto close_fail;
1480         if (!file->f_op)
1481                 goto close_fail;
1482         if (!file->f_op->write)
1483                 goto close_fail;
1484         if (do_truncate(file->f_dentry, 0) != 0)
1485                 goto close_fail;
1486
1487         retval = binfmt->core_dump(signr, regs, file);
1488
1489         if (retval)
1490                 current->signal->group_exit_code |= 0x80;
1491 close_fail:
1492         filp_close(file, NULL);
1493 fail_unlock:
1494         complete_all(&mm->core_done);
1495 fail:
1496         return retval;
1497 }