1 // SPDX-License-Identifier: GPL-2.0
2 /****************************************************************************/
4 * linux/fs/binfmt_flat.c
6 * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
7 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
8 * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
9 * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
12 * linux/fs/binfmt_aout.c:
13 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
14 * linux/fs/binfmt_flat.c for 2.0 kernel
15 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
16 * JAN/99 -- coded full program relocation (gerg@snapgear.com)
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/sched/task_stack.h>
25 #include <linux/mman.h>
26 #include <linux/errno.h>
27 #include <linux/signal.h>
28 #include <linux/string.h>
30 #include <linux/file.h>
31 #include <linux/ptrace.h>
32 #include <linux/user.h>
33 #include <linux/slab.h>
34 #include <linux/binfmts.h>
35 #include <linux/personality.h>
36 #include <linux/init.h>
37 #include <linux/flat.h>
38 #include <linux/uaccess.h>
39 #include <linux/vmalloc.h>
41 #include <asm/byteorder.h>
42 #include <asm/unaligned.h>
43 #include <asm/cacheflush.h>
47 #ifndef flat_get_relocate_addr
48 #define flat_get_relocate_addr(rel) (rel)
51 /****************************************************************************/
54 * User data (data section and bss) needs to be aligned.
55 * We pick 0x20 here because it is the max value elf2flt has always
56 * used in producing FLAT files, and because it seems to be large
57 * enough to make all the gcc alignment related tests happy.
59 #define FLAT_DATA_ALIGN (0x20)
62 * User data (stack) also needs to be aligned.
63 * Here we can be a bit looser than the data sections since this
64 * needs to only meet arch ABI requirements.
66 #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN)
68 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
69 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
71 #define MAX_SHARED_LIBS (1)
73 #ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET
74 #define DATA_START_OFFSET_WORDS (0)
76 #define DATA_START_OFFSET_WORDS (MAX_SHARED_LIBS)
81 unsigned long start_code
; /* Start of text segment */
82 unsigned long start_data
; /* Start of data segment */
83 unsigned long start_brk
; /* End of data segment */
84 unsigned long text_len
; /* Length of text segment */
85 unsigned long entry
; /* Start address for this module */
86 unsigned long build_date
; /* When this one was compiled */
87 bool loaded
; /* Has this library been loaded? */
88 } lib_list
[MAX_SHARED_LIBS
];
91 static int load_flat_binary(struct linux_binprm
*);
93 static struct linux_binfmt flat_format
= {
94 .module
= THIS_MODULE
,
95 .load_binary
= load_flat_binary
,
99 /****************************************************************************/
101 * create_flat_tables() parses the env- and arg-strings in new user
102 * memory and creates the pointer tables from them, and puts their
103 * addresses on the "stack", recording the new stack pointer value.
106 static int create_flat_tables(struct linux_binprm
*bprm
, unsigned long arg_start
)
109 unsigned long __user
*sp
;
112 p
= (char __user
*)arg_start
;
113 sp
= (unsigned long __user
*)current
->mm
->start_stack
;
115 sp
-= bprm
->envc
+ 1;
116 sp
-= bprm
->argc
+ 1;
117 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK
))
118 sp
-= 2; /* argvp + envp */
121 current
->mm
->start_stack
= (unsigned long)sp
& -FLAT_STACK_ALIGN
;
122 sp
= (unsigned long __user
*)current
->mm
->start_stack
;
124 if (put_user(bprm
->argc
, sp
++))
126 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK
)) {
127 unsigned long argv
, envp
;
128 argv
= (unsigned long)(sp
+ 2);
129 envp
= (unsigned long)(sp
+ 2 + bprm
->argc
+ 1);
130 if (put_user(argv
, sp
++) || put_user(envp
, sp
++))
134 current
->mm
->arg_start
= (unsigned long)p
;
135 for (i
= bprm
->argc
; i
> 0; i
--) {
136 if (put_user((unsigned long)p
, sp
++))
138 len
= strnlen_user(p
, MAX_ARG_STRLEN
);
139 if (!len
|| len
> MAX_ARG_STRLEN
)
143 if (put_user(0, sp
++))
145 current
->mm
->arg_end
= (unsigned long)p
;
147 current
->mm
->env_start
= (unsigned long) p
;
148 for (i
= bprm
->envc
; i
> 0; i
--) {
149 if (put_user((unsigned long)p
, sp
++))
151 len
= strnlen_user(p
, MAX_ARG_STRLEN
);
152 if (!len
|| len
> MAX_ARG_STRLEN
)
156 if (put_user(0, sp
++))
158 current
->mm
->env_end
= (unsigned long)p
;
163 /****************************************************************************/
165 #ifdef CONFIG_BINFMT_ZFLAT
167 #include <linux/zlib.h>
169 #define LBUFSIZE 4000
172 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
173 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
174 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
175 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
176 #define COMMENT 0x10 /* bit 4 set: file comment present */
177 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
178 #define RESERVED 0xC0 /* bit 6,7: reserved */
180 static int decompress_exec(struct linux_binprm
*bprm
, loff_t fpos
, char *dst
,
187 pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos
, dst
, len
);
189 memset(&strm
, 0, sizeof(strm
));
190 strm
.workspace
= kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL
);
194 buf
= kmalloc(LBUFSIZE
, GFP_KERNEL
);
200 /* Read in first chunk of data and parse gzip header. */
201 ret
= kernel_read(bprm
->file
, buf
, LBUFSIZE
, &fpos
);
209 /* Check minimum size -- gzip header */
211 pr_debug("file too small?\n");
215 /* Check gzip magic number */
216 if ((buf
[0] != 037) || ((buf
[1] != 0213) && (buf
[1] != 0236))) {
217 pr_debug("unknown compression magic?\n");
221 /* Check gzip method */
223 pr_debug("unknown compression method?\n");
226 /* Check gzip flags */
227 if ((buf
[3] & ENCRYPTED
) || (buf
[3] & CONTINUATION
) ||
228 (buf
[3] & RESERVED
)) {
229 pr_debug("unknown flags?\n");
234 if (buf
[3] & EXTRA_FIELD
) {
235 ret
+= 2 + buf
[10] + (buf
[11] << 8);
236 if (unlikely(ret
>= LBUFSIZE
)) {
237 pr_debug("buffer overflow (EXTRA)?\n");
241 if (buf
[3] & ORIG_NAME
) {
242 while (ret
< LBUFSIZE
&& buf
[ret
++] != 0)
244 if (unlikely(ret
== LBUFSIZE
)) {
245 pr_debug("buffer overflow (ORIG_NAME)?\n");
249 if (buf
[3] & COMMENT
) {
250 while (ret
< LBUFSIZE
&& buf
[ret
++] != 0)
252 if (unlikely(ret
== LBUFSIZE
)) {
253 pr_debug("buffer overflow (COMMENT)?\n");
259 strm
.avail_in
-= ret
;
262 strm
.avail_out
= len
;
265 if (zlib_inflateInit2(&strm
, -MAX_WBITS
) != Z_OK
) {
266 pr_debug("zlib init failed?\n");
270 while ((ret
= zlib_inflate(&strm
, Z_NO_FLUSH
)) == Z_OK
) {
271 ret
= kernel_read(bprm
->file
, buf
, LBUFSIZE
, &fpos
);
282 pr_debug("decompression failed (%d), %s\n",
289 zlib_inflateEnd(&strm
);
293 kfree(strm
.workspace
);
297 #endif /* CONFIG_BINFMT_ZFLAT */
299 /****************************************************************************/
302 calc_reloc(unsigned long r
, struct lib_info
*p
)
305 unsigned long start_brk
;
306 unsigned long start_data
;
307 unsigned long text_len
;
308 unsigned long start_code
;
310 start_brk
= p
->lib_list
[0].start_brk
;
311 start_data
= p
->lib_list
[0].start_data
;
312 start_code
= p
->lib_list
[0].start_code
;
313 text_len
= p
->lib_list
[0].text_len
;
315 if (r
> start_brk
- start_data
+ text_len
) {
316 pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
317 r
, start_brk
-start_data
+text_len
, text_len
);
321 if (r
< text_len
) /* In text segment */
322 addr
= r
+ start_code
;
323 else /* In data segment */
324 addr
= r
- text_len
+ start_data
;
326 /* Range checked already above so doing the range tests is redundant...*/
330 pr_cont(", killing %s!\n", current
->comm
);
331 send_sig(SIGSEGV
, current
, 0);
336 /****************************************************************************/
338 #ifdef CONFIG_BINFMT_FLAT_OLD
339 static void old_reloc(unsigned long rl
)
341 static const char *segment
[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
343 unsigned long __user
*ptr
;
347 #if defined(CONFIG_COLDFIRE)
348 ptr
= (unsigned long __user
*)(current
->mm
->start_code
+ r
.reloc
.offset
);
350 ptr
= (unsigned long __user
*)(current
->mm
->start_data
+ r
.reloc
.offset
);
354 pr_debug("Relocation of variable at DATASEG+%x "
355 "(address %p, currently %lx) into segment %s\n",
356 r
.reloc
.offset
, ptr
, val
, segment
[r
.reloc
.type
]);
358 switch (r
.reloc
.type
) {
359 case OLD_FLAT_RELOC_TYPE_TEXT
:
360 val
+= current
->mm
->start_code
;
362 case OLD_FLAT_RELOC_TYPE_DATA
:
363 val
+= current
->mm
->start_data
;
365 case OLD_FLAT_RELOC_TYPE_BSS
:
366 val
+= current
->mm
->end_data
;
369 pr_err("Unknown relocation type=%x\n", r
.reloc
.type
);
374 pr_debug("Relocation became %lx\n", val
);
376 #endif /* CONFIG_BINFMT_FLAT_OLD */
378 /****************************************************************************/
380 static inline u32 __user
*skip_got_header(u32 __user
*rp
)
382 if (IS_ENABLED(CONFIG_RISCV
)) {
384 * RISC-V has a 16 byte GOT PLT header for elf64-riscv
385 * and 8 byte GOT PLT header for elf32-riscv.
386 * Skip the whole GOT PLT header, since it is reserved
387 * for the dynamic linker (ld.so).
389 u32 rp_val0
, rp_val1
;
391 if (get_user(rp_val0
, rp
))
393 if (get_user(rp_val1
, rp
+ 1))
396 if (rp_val0
== 0xffffffff && rp_val1
== 0xffffffff)
398 else if (rp_val0
== 0xffffffff)
404 static int load_flat_file(struct linux_binprm
*bprm
,
405 struct lib_info
*libinfo
, unsigned long *extra_stack
)
407 struct flat_hdr
*hdr
;
408 unsigned long textpos
, datapos
, realdatastart
;
409 u32 text_len
, data_len
, bss_len
, stack_len
, full_data
, flags
;
410 unsigned long len
, memp
, memp_size
, extra
, rlim
;
411 __be32 __user
*reloc
;
415 unsigned long start_code
, end_code
;
419 hdr
= ((struct flat_hdr
*) bprm
->buf
); /* exec-header */
421 text_len
= ntohl(hdr
->data_start
);
422 data_len
= ntohl(hdr
->data_end
) - ntohl(hdr
->data_start
);
423 bss_len
= ntohl(hdr
->bss_end
) - ntohl(hdr
->data_end
);
424 stack_len
= ntohl(hdr
->stack_size
);
426 stack_len
+= *extra_stack
;
427 *extra_stack
= stack_len
;
429 relocs
= ntohl(hdr
->reloc_count
);
430 flags
= ntohl(hdr
->flags
);
431 rev
= ntohl(hdr
->rev
);
432 full_data
= data_len
+ relocs
* sizeof(unsigned long);
434 if (strncmp(hdr
->magic
, "bFLT", 4)) {
436 * Previously, here was a printk to tell people
437 * "BINFMT_FLAT: bad header magic".
438 * But for the kernel which also use ELF FD-PIC format, this
439 * error message is confusing.
440 * because a lot of people do not manage to produce good
446 if (flags
& FLAT_FLAG_KTRACE
)
447 pr_info("Loading file: %s\n", bprm
->filename
);
449 #ifdef CONFIG_BINFMT_FLAT_OLD
450 if (rev
!= FLAT_VERSION
&& rev
!= OLD_FLAT_VERSION
) {
451 pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
452 rev
, FLAT_VERSION
, OLD_FLAT_VERSION
);
458 * fix up the flags for the older format, there were all kinds
459 * of endian hacks, this only works for the simple cases
461 if (rev
== OLD_FLAT_VERSION
&&
462 (flags
|| IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM
)))
463 flags
= FLAT_FLAG_RAM
;
465 #else /* CONFIG_BINFMT_FLAT_OLD */
466 if (rev
!= FLAT_VERSION
) {
467 pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
472 #endif /* !CONFIG_BINFMT_FLAT_OLD */
475 * Make sure the header params are sane.
476 * 28 bits (256 MB) is way more than reasonable in this case.
477 * If some top bits are set we have probable binary corruption.
479 if ((text_len
| data_len
| bss_len
| stack_len
| full_data
) >> 28) {
480 pr_err("bad header\n");
485 #ifndef CONFIG_BINFMT_ZFLAT
486 if (flags
& (FLAT_FLAG_GZIP
|FLAT_FLAG_GZDATA
)) {
487 pr_err("Support for ZFLAT executables is not enabled.\n");
494 * Check initial limits. This avoids letting people circumvent
495 * size limits imposed on them by creating programs with large
496 * arrays in the data or bss.
498 rlim
= rlimit(RLIMIT_DATA
);
499 if (rlim
>= RLIM_INFINITY
)
501 if (data_len
+ bss_len
> rlim
) {
506 /* Flush all traces of the currently running executable */
507 ret
= begin_new_exec(bprm
);
511 /* OK, This is the point of no return */
512 set_personality(PER_LINUX_32BIT
);
513 setup_new_exec(bprm
);
516 * calculate the extra space we need to map in
518 extra
= max_t(unsigned long, bss_len
+ stack_len
,
519 relocs
* sizeof(unsigned long));
522 * there are a couple of cases here, the separate code/data
523 * case, and then the fully copied to RAM case which lumps
526 if (!IS_ENABLED(CONFIG_MMU
) && !(flags
& (FLAT_FLAG_RAM
|FLAT_FLAG_GZIP
))) {
528 * this should give us a ROM ptr, but if it doesn't we don't
531 pr_debug("ROM mapping of file (we hope)\n");
533 textpos
= vm_mmap(bprm
->file
, 0, text_len
, PROT_READ
|PROT_EXEC
,
535 if (!textpos
|| IS_ERR_VALUE(textpos
)) {
539 pr_err("Unable to mmap process text, errno %d\n", ret
);
543 len
= data_len
+ extra
+
544 DATA_START_OFFSET_WORDS
* sizeof(unsigned long);
545 len
= PAGE_ALIGN(len
);
546 realdatastart
= vm_mmap(NULL
, 0, len
,
547 PROT_READ
|PROT_WRITE
|PROT_EXEC
, MAP_PRIVATE
, 0);
549 if (realdatastart
== 0 || IS_ERR_VALUE(realdatastart
)) {
553 pr_err("Unable to allocate RAM for process data, "
555 vm_munmap(textpos
, text_len
);
558 datapos
= ALIGN(realdatastart
+
559 DATA_START_OFFSET_WORDS
* sizeof(unsigned long),
562 pr_debug("Allocated data+bss+stack (%u bytes): %lx\n",
563 data_len
+ bss_len
+ stack_len
, datapos
);
565 fpos
= ntohl(hdr
->data_start
);
566 #ifdef CONFIG_BINFMT_ZFLAT
567 if (flags
& FLAT_FLAG_GZDATA
) {
568 result
= decompress_exec(bprm
, fpos
, (char *)datapos
,
573 result
= read_code(bprm
->file
, datapos
, fpos
,
576 if (IS_ERR_VALUE(result
)) {
578 pr_err("Unable to read data+bss, errno %d\n", ret
);
579 vm_munmap(textpos
, text_len
);
580 vm_munmap(realdatastart
, len
);
584 reloc
= (__be32 __user
*)
585 (datapos
+ (ntohl(hdr
->reloc_start
) - text_len
));
586 memp
= realdatastart
;
590 len
= text_len
+ data_len
+ extra
+
591 DATA_START_OFFSET_WORDS
* sizeof(u32
);
592 len
= PAGE_ALIGN(len
);
593 textpos
= vm_mmap(NULL
, 0, len
,
594 PROT_READ
| PROT_EXEC
| PROT_WRITE
, MAP_PRIVATE
, 0);
596 if (!textpos
|| IS_ERR_VALUE(textpos
)) {
600 pr_err("Unable to allocate RAM for process text/data, "
605 realdatastart
= textpos
+ ntohl(hdr
->data_start
);
606 datapos
= ALIGN(realdatastart
+
607 DATA_START_OFFSET_WORDS
* sizeof(u32
),
610 reloc
= (__be32 __user
*)
611 (datapos
+ (ntohl(hdr
->reloc_start
) - text_len
));
614 #ifdef CONFIG_BINFMT_ZFLAT
616 * load it all in and treat it like a RAM load from now on
618 if (flags
& FLAT_FLAG_GZIP
) {
620 result
= decompress_exec(bprm
, sizeof(struct flat_hdr
),
621 (((char *)textpos
) + sizeof(struct flat_hdr
)),
622 (text_len
+ full_data
623 - sizeof(struct flat_hdr
)),
625 memmove((void *) datapos
, (void *) realdatastart
,
629 * This is used on MMU systems mainly for testing.
630 * Let's use a kernel buffer to simplify things.
632 long unz_text_len
= text_len
- sizeof(struct flat_hdr
);
633 long unz_len
= unz_text_len
+ full_data
;
634 char *unz_data
= vmalloc(unz_len
);
638 result
= decompress_exec(bprm
, sizeof(struct flat_hdr
),
639 unz_data
, unz_len
, 0);
641 (copy_to_user((void __user
*)textpos
+ sizeof(struct flat_hdr
),
642 unz_data
, unz_text_len
) ||
643 copy_to_user((void __user
*)datapos
,
644 unz_data
+ unz_text_len
, full_data
)))
649 } else if (flags
& FLAT_FLAG_GZDATA
) {
650 result
= read_code(bprm
->file
, textpos
, 0, text_len
);
651 if (!IS_ERR_VALUE(result
)) {
653 result
= decompress_exec(bprm
, text_len
, (char *) datapos
,
656 char *unz_data
= vmalloc(full_data
);
660 result
= decompress_exec(bprm
, text_len
,
661 unz_data
, full_data
, 0);
663 copy_to_user((void __user
*)datapos
,
664 unz_data
, full_data
))
671 #endif /* CONFIG_BINFMT_ZFLAT */
673 result
= read_code(bprm
->file
, textpos
, 0, text_len
);
674 if (!IS_ERR_VALUE(result
))
675 result
= read_code(bprm
->file
, datapos
,
676 ntohl(hdr
->data_start
),
679 if (IS_ERR_VALUE(result
)) {
681 pr_err("Unable to read code+data+bss, errno %d\n", ret
);
682 vm_munmap(textpos
, text_len
+ data_len
+ extra
+
683 DATA_START_OFFSET_WORDS
* sizeof(u32
));
688 start_code
= textpos
+ sizeof(struct flat_hdr
);
689 end_code
= textpos
+ text_len
;
690 text_len
-= sizeof(struct flat_hdr
); /* the real code len */
692 /* The main program needs a little extra setup in the task structure */
693 current
->mm
->start_code
= start_code
;
694 current
->mm
->end_code
= end_code
;
695 current
->mm
->start_data
= datapos
;
696 current
->mm
->end_data
= datapos
+ data_len
;
698 * set up the brk stuff, uses any slack left in data/bss/stack
699 * allocation. We put the brk after the bss (between the bss
700 * and stack) like other platforms.
701 * Userspace code relies on the stack pointer starting out at
702 * an address right at the end of a page.
704 current
->mm
->start_brk
= datapos
+ data_len
+ bss_len
;
705 current
->mm
->brk
= (current
->mm
->start_brk
+ 3) & ~3;
707 current
->mm
->context
.end_brk
= memp
+ memp_size
- stack_len
;
710 if (flags
& FLAT_FLAG_KTRACE
) {
711 pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n",
712 textpos
, 0x00ffffff&ntohl(hdr
->entry
), ntohl(hdr
->data_start
));
713 pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
714 "Load", bprm
->filename
,
715 start_code
, end_code
, datapos
, datapos
+ data_len
,
716 datapos
+ data_len
, (datapos
+ data_len
+ bss_len
+ 3) & ~3);
719 /* Store the current module values into the global library structure */
720 libinfo
->lib_list
[0].start_code
= start_code
;
721 libinfo
->lib_list
[0].start_data
= datapos
;
722 libinfo
->lib_list
[0].start_brk
= datapos
+ data_len
+ bss_len
;
723 libinfo
->lib_list
[0].text_len
= text_len
;
724 libinfo
->lib_list
[0].loaded
= 1;
725 libinfo
->lib_list
[0].entry
= (0x00ffffff & ntohl(hdr
->entry
)) + textpos
;
726 libinfo
->lib_list
[0].build_date
= ntohl(hdr
->build_date
);
729 * We just load the allocations into some temporary memory to
730 * help simplify all this mumbo jumbo
732 * We've got two different sections of relocation entries.
733 * The first is the GOT which resides at the beginning of the data segment
734 * and is terminated with a -1. This one can be relocated in place.
735 * The second is the extra relocation entries tacked after the image's
736 * data segment. These require a little more processing as the entry is
737 * really an offset into the image which contains an offset into the
740 if (flags
& FLAT_FLAG_GOTPIC
) {
741 rp
= skip_got_header((u32 __user
*) datapos
);
744 if (get_user(rp_val
, rp
))
746 if (rp_val
== 0xffffffff)
749 addr
= calc_reloc(rp_val
, libinfo
);
750 if (addr
== RELOC_FAILED
) {
754 if (put_user(addr
, rp
))
761 * Now run through the relocation entries.
762 * We've got to be careful here as C++ produces relocatable zero
763 * entries in the constructor and destructor tables which are then
764 * tested for being not zero (which will always occur unless we're
765 * based from address zero). This causes an endless loop as __start
766 * is at zero. The solution used is to not relocate zero addresses.
767 * This has the negative side effect of not allowing a global data
768 * reference to be statically initialised to _stext (I've moved
769 * __start to address 4 so that is okay).
771 if (rev
> OLD_FLAT_VERSION
) {
772 for (i
= 0; i
< relocs
; i
++) {
777 * Get the address of the pointer to be
778 * relocated (of course, the address has to be
781 if (get_user(tmp
, reloc
+ i
))
784 addr
= flat_get_relocate_addr(relval
);
785 rp
= (u32 __user
*)calc_reloc(addr
, libinfo
);
786 if (rp
== (u32 __user
*)RELOC_FAILED
) {
791 /* Get the pointer's value. */
792 ret
= flat_get_addr_from_rp(rp
, relval
, flags
, &addr
);
798 * Do the relocation. PIC relocs in the data section are
799 * already in target order
801 if ((flags
& FLAT_FLAG_GOTPIC
) == 0) {
803 * Meh, the same value can have a different
804 * byte order based on a flag..
806 addr
= ntohl((__force __be32
)addr
);
808 addr
= calc_reloc(addr
, libinfo
);
809 if (addr
== RELOC_FAILED
) {
814 /* Write back the relocated pointer. */
815 ret
= flat_put_addr_at_rp(rp
, addr
, relval
);
820 #ifdef CONFIG_BINFMT_FLAT_OLD
822 for (i
= 0; i
< relocs
; i
++) {
824 if (get_user(relval
, reloc
+ i
))
826 old_reloc(ntohl(relval
));
828 #endif /* CONFIG_BINFMT_FLAT_OLD */
831 flush_icache_user_range(start_code
, end_code
);
833 /* zero the BSS, BRK and stack areas */
834 if (clear_user((void __user
*)(datapos
+ data_len
), bss_len
+
835 (memp
+ memp_size
- stack_len
- /* end brk */
836 libinfo
->lib_list
[0].start_brk
) + /* start brk */
846 /****************************************************************************/
849 * These are the functions used to load flat style executables and shared
850 * libraries. There is no binary dependent code anywhere else.
853 static int load_flat_binary(struct linux_binprm
*bprm
)
855 struct lib_info libinfo
;
856 struct pt_regs
*regs
= current_pt_regs();
857 unsigned long stack_len
= 0;
858 unsigned long start_addr
;
862 memset(&libinfo
, 0, sizeof(libinfo
));
865 * We have to add the size of our arguments to our stack size
866 * otherwise it's too easy for users to create stack overflows
867 * by passing in a huge argument list. And yes, we have to be
868 * pedantic and include space for the argv/envp array as it may have
872 stack_len
+= PAGE_SIZE
* MAX_ARG_PAGES
- bprm
->p
; /* the strings */
874 stack_len
+= (bprm
->argc
+ 1) * sizeof(char *); /* the argv array */
875 stack_len
+= (bprm
->envc
+ 1) * sizeof(char *); /* the envp array */
876 stack_len
= ALIGN(stack_len
, FLAT_STACK_ALIGN
);
878 res
= load_flat_file(bprm
, &libinfo
, &stack_len
);
882 /* Update data segment pointers for all libraries */
883 for (i
= 0; i
< MAX_SHARED_LIBS
; i
++) {
884 if (!libinfo
.lib_list
[i
].loaded
)
886 for (j
= 0; j
< MAX_SHARED_LIBS
; j
++) {
887 unsigned long val
= libinfo
.lib_list
[j
].loaded
?
888 libinfo
.lib_list
[j
].start_data
: UNLOADED_LIB
;
889 unsigned long __user
*p
= (unsigned long __user
*)
890 libinfo
.lib_list
[i
].start_data
;
892 if (put_user(val
, p
))
897 set_binfmt(&flat_format
);
900 res
= setup_arg_pages(bprm
, STACK_TOP
, EXSTACK_DEFAULT
);
902 res
= create_flat_tables(bprm
, bprm
->p
);
904 /* Stash our initial stack pointer into the mm structure */
905 current
->mm
->start_stack
=
906 ((current
->mm
->context
.end_brk
+ stack_len
+ 3) & ~3) - 4;
907 pr_debug("sp=%lx\n", current
->mm
->start_stack
);
909 /* copy the arg pages onto the stack */
910 res
= transfer_args_to_stack(bprm
, ¤t
->mm
->start_stack
);
912 res
= create_flat_tables(bprm
, current
->mm
->start_stack
);
917 /* Fake some return addresses to ensure the call chain will
918 * initialise library in order for us. We are required to call
919 * lib 1 first, then 2, ... and finally the main program (id 0).
921 start_addr
= libinfo
.lib_list
[0].entry
;
923 #ifdef FLAT_PLAT_INIT
924 FLAT_PLAT_INIT(regs
);
928 pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
929 regs
, start_addr
, current
->mm
->start_stack
);
930 start_thread(regs
, start_addr
, current
->mm
->start_stack
);
935 /****************************************************************************/
937 static int __init
init_flat_binfmt(void)
939 register_binfmt(&flat_format
);
942 core_initcall(init_flat_binfmt
);
944 /****************************************************************************/