]>
git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/binfmt_aout.c
2 * linux/fs/binfmt_aout.c
4 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
7 #include <linux/module.h>
9 #include <linux/time.h>
10 #include <linux/kernel.h>
12 #include <linux/mman.h>
13 #include <linux/a.out.h>
14 #include <linux/errno.h>
15 #include <linux/signal.h>
16 #include <linux/string.h>
18 #include <linux/file.h>
19 #include <linux/stat.h>
20 #include <linux/fcntl.h>
21 #include <linux/ptrace.h>
22 #include <linux/user.h>
23 #include <linux/slab.h>
24 #include <linux/binfmts.h>
25 #include <linux/personality.h>
26 #include <linux/init.h>
28 #include <asm/system.h>
29 #include <asm/uaccess.h>
30 #include <asm/cacheflush.h>
32 static int load_aout_binary(struct linux_binprm
*, struct pt_regs
* regs
);
33 static int load_aout_library(struct file
*);
34 static int aout_core_dump(long signr
, struct pt_regs
* regs
, struct file
*file
);
36 static struct linux_binfmt aout_format
= {
37 .module
= THIS_MODULE
,
38 .load_binary
= load_aout_binary
,
39 .load_shlib
= load_aout_library
,
40 .core_dump
= aout_core_dump
,
41 .min_coredump
= PAGE_SIZE
44 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
46 static int set_brk(unsigned long start
, unsigned long end
)
48 start
= PAGE_ALIGN(start
);
49 end
= PAGE_ALIGN(end
);
52 down_write(¤t
->mm
->mmap_sem
);
53 addr
= do_brk(start
, end
- start
);
54 up_write(¤t
->mm
->mmap_sem
);
62 * These are the only things you should do on a core-file: use only these
63 * macros to write out all the necessary info.
66 static int dump_write(struct file
*file
, const void *addr
, int nr
)
68 return file
->f_op
->write(file
, addr
, nr
, &file
->f_pos
) == nr
;
71 #define DUMP_WRITE(addr, nr) \
72 if (!dump_write(file, (void *)(addr), (nr))) \
75 #define DUMP_SEEK(offset) \
76 if (file->f_op->llseek) { \
77 if (file->f_op->llseek(file,(offset),0) != (offset)) \
79 } else file->f_pos = (offset)
82 * Routine writes a core dump image in the current directory.
83 * Currently only a stub-function.
85 * Note that setuid/setgid files won't make a core-dump if the uid/gid
86 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
87 * field, which also makes sure the core-dumps won't be recursive if the
88 * dumping of the process results in another error..
91 static int aout_core_dump(long signr
, struct pt_regs
* regs
, struct file
*file
)
95 unsigned long dump_start
, dump_size
;
97 #if defined(__alpha__)
98 # define START_DATA(u) (u.start_data)
99 #elif defined(__arm__)
100 # define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code)
101 #elif defined(__sparc__)
102 # define START_DATA(u) (u.u_tsize)
103 #elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__)
104 # define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
107 # define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
109 # define START_STACK(u) (u.start_stack)
115 current
->flags
|= PF_DUMPCORE
;
116 strncpy(dump
.u_comm
, current
->comm
, sizeof(dump
.u_comm
));
118 dump
.u_ar0
= (void *)(((unsigned long)(&dump
.regs
)) - ((unsigned long)(&dump
)));
121 dump_thread(regs
, &dump
);
123 /* If the size of the dump file exceeds the rlimit, then see what would happen
124 if we wrote the stack, but not the data area. */
126 if ((dump
.u_dsize
+dump
.u_ssize
) >
127 current
->signal
->rlim
[RLIMIT_CORE
].rlim_cur
)
130 if ((dump
.u_dsize
+dump
.u_ssize
+1) * PAGE_SIZE
>
131 current
->signal
->rlim
[RLIMIT_CORE
].rlim_cur
)
135 /* Make sure we have enough room to write the stack and data areas. */
138 current
->signal
->rlim
[RLIMIT_CORE
].rlim_cur
)
141 if ((dump
.u_ssize
+1) * PAGE_SIZE
>
142 current
->signal
->rlim
[RLIMIT_CORE
].rlim_cur
)
146 /* make sure we actually have a data and stack area to dump */
149 if (!access_ok(VERIFY_READ
, (void __user
*)START_DATA(dump
), dump
.u_dsize
))
151 if (!access_ok(VERIFY_READ
, (void __user
*)START_STACK(dump
), dump
.u_ssize
))
154 if (!access_ok(VERIFY_READ
, (void __user
*)START_DATA(dump
), dump
.u_dsize
<< PAGE_SHIFT
))
156 if (!access_ok(VERIFY_READ
, (void __user
*)START_STACK(dump
), dump
.u_ssize
<< PAGE_SHIFT
))
162 DUMP_WRITE(&dump
,sizeof(dump
));
163 /* Now dump all of the user data. Include malloced stuff as well */
165 DUMP_SEEK(PAGE_SIZE
);
167 /* now we start writing out the user space info */
169 /* Dump the data area */
170 if (dump
.u_dsize
!= 0) {
171 dump_start
= START_DATA(dump
);
173 dump_size
= dump
.u_dsize
;
175 dump_size
= dump
.u_dsize
<< PAGE_SHIFT
;
177 DUMP_WRITE(dump_start
,dump_size
);
179 /* Now prepare to dump the stack area */
180 if (dump
.u_ssize
!= 0) {
181 dump_start
= START_STACK(dump
);
183 dump_size
= dump
.u_ssize
;
185 dump_size
= dump
.u_ssize
<< PAGE_SHIFT
;
187 DUMP_WRITE(dump_start
,dump_size
);
189 /* Finally dump the task struct. Not be used by gdb, but could be useful */
191 DUMP_WRITE(current
,sizeof(*current
));
198 * create_aout_tables() parses the env- and arg-strings in new user
199 * memory and creates the pointer tables from them, and puts their
200 * addresses on the "stack", returning the new stack pointer value.
202 static unsigned long __user
*create_aout_tables(char __user
*p
, struct linux_binprm
* bprm
)
204 char __user
* __user
*argv
;
205 char __user
* __user
*envp
;
206 unsigned long __user
*sp
;
207 int argc
= bprm
->argc
;
208 int envc
= bprm
->envc
;
210 sp
= (void __user
*)((-(unsigned long)sizeof(char *)) & (unsigned long) p
);
212 /* This imposes the proper stack alignment for a new process. */
213 sp
= (void __user
*) (((unsigned long) sp
) & ~7);
214 if ((envc
+argc
+3)&1) --sp
;
217 /* whee.. test-programs are so much fun. */
222 put_user(0x3eb, --sp
);
223 put_user(bprm
->loader
, --sp
);
224 put_user(0x3ea, --sp
);
226 put_user(bprm
->exec
, --sp
);
227 put_user(0x3e9, --sp
);
230 envp
= (char __user
* __user
*) sp
;
232 argv
= (char __user
* __user
*) sp
;
233 #if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__)
234 put_user((unsigned long) envp
,--sp
);
235 put_user((unsigned long) argv
,--sp
);
238 current
->mm
->arg_start
= (unsigned long) p
;
247 current
->mm
->arg_end
= current
->mm
->env_start
= (unsigned long) p
;
256 current
->mm
->env_end
= (unsigned long) p
;
261 * These are the functions used to load a.out style executables and shared
262 * libraries. There is no binary dependent code anywhere else.
265 static int load_aout_binary(struct linux_binprm
* bprm
, struct pt_regs
* regs
)
269 unsigned long fd_offset
;
273 ex
= *((struct exec
*) bprm
->buf
); /* exec-header */
274 if ((N_MAGIC(ex
) != ZMAGIC
&& N_MAGIC(ex
) != OMAGIC
&&
275 N_MAGIC(ex
) != QMAGIC
&& N_MAGIC(ex
) != NMAGIC
) ||
276 N_TRSIZE(ex
) || N_DRSIZE(ex
) ||
277 i_size_read(bprm
->file
->f_dentry
->d_inode
) < ex
.a_text
+ex
.a_data
+N_SYMSIZE(ex
)+N_TXTOFF(ex
)) {
281 fd_offset
= N_TXTOFF(ex
);
283 /* Check initial limits. This avoids letting people circumvent
284 * size limits imposed on them by creating programs with large
285 * arrays in the data or bss.
287 rlim
= current
->signal
->rlim
[RLIMIT_DATA
].rlim_cur
;
288 if (rlim
>= RLIM_INFINITY
)
290 if (ex
.a_data
+ ex
.a_bss
> rlim
)
293 /* Flush all traces of the currently running executable */
294 retval
= flush_old_exec(bprm
);
298 /* OK, This is the point of no return */
299 #if defined(__alpha__)
300 SET_AOUT_PERSONALITY(bprm
, ex
);
301 #elif defined(__sparc__)
302 set_personality(PER_SUNOS
);
303 #if !defined(__sparc_v9__)
304 memcpy(¤t
->thread
.core_exec
, &ex
, sizeof(struct exec
));
307 set_personality(PER_LINUX
);
310 current
->mm
->end_code
= ex
.a_text
+
311 (current
->mm
->start_code
= N_TXTADDR(ex
));
312 current
->mm
->end_data
= ex
.a_data
+
313 (current
->mm
->start_data
= N_DATADDR(ex
));
314 current
->mm
->brk
= ex
.a_bss
+
315 (current
->mm
->start_brk
= N_BSSADDR(ex
));
316 current
->mm
->free_area_cache
= current
->mm
->mmap_base
;
317 current
->mm
->cached_hole_size
= 0;
319 current
->mm
->mmap
= NULL
;
321 current
->flags
&= ~PF_FORKNOEXEC
;
323 if (N_MAGIC(ex
) == NMAGIC
) {
324 loff_t pos
= fd_offset
;
325 /* Fuck me plenty... */
327 down_write(¤t
->mm
->mmap_sem
);
328 error
= do_brk(N_TXTADDR(ex
), ex
.a_text
);
329 up_write(¤t
->mm
->mmap_sem
);
330 bprm
->file
->f_op
->read(bprm
->file
, (char *) N_TXTADDR(ex
),
332 down_write(¤t
->mm
->mmap_sem
);
333 error
= do_brk(N_DATADDR(ex
), ex
.a_data
);
334 up_write(¤t
->mm
->mmap_sem
);
335 bprm
->file
->f_op
->read(bprm
->file
, (char *) N_DATADDR(ex
),
341 if (N_MAGIC(ex
) == OMAGIC
) {
342 unsigned long text_addr
, map_size
;
345 text_addr
= N_TXTADDR(ex
);
347 #if defined(__alpha__) || defined(__sparc__)
349 map_size
= ex
.a_text
+ex
.a_data
+ PAGE_SIZE
- 1;
352 map_size
= ex
.a_text
+ex
.a_data
;
354 down_write(¤t
->mm
->mmap_sem
);
355 error
= do_brk(text_addr
& PAGE_MASK
, map_size
);
356 up_write(¤t
->mm
->mmap_sem
);
357 if (error
!= (text_addr
& PAGE_MASK
)) {
358 send_sig(SIGKILL
, current
, 0);
362 error
= bprm
->file
->f_op
->read(bprm
->file
,
363 (char __user
*)text_addr
,
364 ex
.a_text
+ex
.a_data
, &pos
);
365 if ((signed long)error
< 0) {
366 send_sig(SIGKILL
, current
, 0);
370 flush_icache_range(text_addr
, text_addr
+ex
.a_text
+ex
.a_data
);
372 static unsigned long error_time
, error_time2
;
373 if ((ex
.a_text
& 0xfff || ex
.a_data
& 0xfff) &&
374 (N_MAGIC(ex
) != NMAGIC
) && (jiffies
-error_time2
) > 5*HZ
)
376 printk(KERN_NOTICE
"executable not page aligned\n");
377 error_time2
= jiffies
;
380 if ((fd_offset
& ~PAGE_MASK
) != 0 &&
381 (jiffies
-error_time
) > 5*HZ
)
384 "fd_offset is not page aligned. Please convert program: %s\n",
385 bprm
->file
->f_dentry
->d_name
.name
);
386 error_time
= jiffies
;
389 if (!bprm
->file
->f_op
->mmap
||((fd_offset
& ~PAGE_MASK
) != 0)) {
390 loff_t pos
= fd_offset
;
391 down_write(¤t
->mm
->mmap_sem
);
392 do_brk(N_TXTADDR(ex
), ex
.a_text
+ex
.a_data
);
393 up_write(¤t
->mm
->mmap_sem
);
394 bprm
->file
->f_op
->read(bprm
->file
,
395 (char __user
*)N_TXTADDR(ex
),
396 ex
.a_text
+ex
.a_data
, &pos
);
397 flush_icache_range((unsigned long) N_TXTADDR(ex
),
398 (unsigned long) N_TXTADDR(ex
) +
399 ex
.a_text
+ex
.a_data
);
403 down_write(¤t
->mm
->mmap_sem
);
404 error
= do_mmap(bprm
->file
, N_TXTADDR(ex
), ex
.a_text
,
405 PROT_READ
| PROT_EXEC
,
406 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
| MAP_EXECUTABLE
,
408 up_write(¤t
->mm
->mmap_sem
);
410 if (error
!= N_TXTADDR(ex
)) {
411 send_sig(SIGKILL
, current
, 0);
415 down_write(¤t
->mm
->mmap_sem
);
416 error
= do_mmap(bprm
->file
, N_DATADDR(ex
), ex
.a_data
,
417 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
418 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
| MAP_EXECUTABLE
,
419 fd_offset
+ ex
.a_text
);
420 up_write(¤t
->mm
->mmap_sem
);
421 if (error
!= N_DATADDR(ex
)) {
422 send_sig(SIGKILL
, current
, 0);
427 set_binfmt(&aout_format
);
429 retval
= set_brk(current
->mm
->start_brk
, current
->mm
->brk
);
431 send_sig(SIGKILL
, current
, 0);
435 retval
= setup_arg_pages(bprm
, STACK_TOP
, EXSTACK_DEFAULT
);
437 /* Someone check-me: is this error path enough? */
438 send_sig(SIGKILL
, current
, 0);
442 current
->mm
->start_stack
=
443 (unsigned long) create_aout_tables((char __user
*) bprm
->p
, bprm
);
445 regs
->gp
= ex
.a_gpvalue
;
447 start_thread(regs
, ex
.a_entry
, current
->mm
->start_stack
);
448 if (unlikely(current
->ptrace
& PT_PTRACED
)) {
449 if (current
->ptrace
& PT_TRACE_EXEC
)
450 ptrace_notify ((PTRACE_EVENT_EXEC
<< 8) | SIGTRAP
);
452 send_sig(SIGTRAP
, current
, 0);
457 static int load_aout_library(struct file
*file
)
459 struct inode
* inode
;
460 unsigned long bss
, start_addr
, len
;
465 inode
= file
->f_dentry
->d_inode
;
468 error
= kernel_read(file
, 0, (char *) &ex
, sizeof(ex
));
469 if (error
!= sizeof(ex
))
472 /* We come in here for the regular a.out style of shared libraries */
473 if ((N_MAGIC(ex
) != ZMAGIC
&& N_MAGIC(ex
) != QMAGIC
) || N_TRSIZE(ex
) ||
474 N_DRSIZE(ex
) || ((ex
.a_entry
& 0xfff) && N_MAGIC(ex
) == ZMAGIC
) ||
475 i_size_read(inode
) < ex
.a_text
+ex
.a_data
+N_SYMSIZE(ex
)+N_TXTOFF(ex
)) {
482 /* For QMAGIC, the starting address is 0x20 into the page. We mask
483 this off to get the starting address for the page */
485 start_addr
= ex
.a_entry
& 0xfffff000;
487 if ((N_TXTOFF(ex
) & ~PAGE_MASK
) != 0) {
488 static unsigned long error_time
;
489 loff_t pos
= N_TXTOFF(ex
);
491 if ((jiffies
-error_time
) > 5*HZ
)
494 "N_TXTOFF is not page aligned. Please convert library: %s\n",
495 file
->f_dentry
->d_name
.name
);
496 error_time
= jiffies
;
498 down_write(¤t
->mm
->mmap_sem
);
499 do_brk(start_addr
, ex
.a_text
+ ex
.a_data
+ ex
.a_bss
);
500 up_write(¤t
->mm
->mmap_sem
);
502 file
->f_op
->read(file
, (char __user
*)start_addr
,
503 ex
.a_text
+ ex
.a_data
, &pos
);
504 flush_icache_range((unsigned long) start_addr
,
505 (unsigned long) start_addr
+ ex
.a_text
+ ex
.a_data
);
510 /* Now use mmap to map the library into memory. */
511 down_write(¤t
->mm
->mmap_sem
);
512 error
= do_mmap(file
, start_addr
, ex
.a_text
+ ex
.a_data
,
513 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
514 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
,
516 up_write(¤t
->mm
->mmap_sem
);
518 if (error
!= start_addr
)
521 len
= PAGE_ALIGN(ex
.a_text
+ ex
.a_data
);
522 bss
= ex
.a_text
+ ex
.a_data
+ ex
.a_bss
;
524 down_write(¤t
->mm
->mmap_sem
);
525 error
= do_brk(start_addr
+ len
, bss
- len
);
526 up_write(¤t
->mm
->mmap_sem
);
528 if (error
!= start_addr
+ len
)
536 static int __init
init_aout_binfmt(void)
538 return register_binfmt(&aout_format
);
541 static void __exit
exit_aout_binfmt(void)
543 unregister_binfmt(&aout_format
);
546 core_initcall(init_aout_binfmt
);
547 module_exit(exit_aout_binfmt
);
548 MODULE_LICENSE("GPL");