blob: 42c6b4a54445620856c1e0ab7814bf7f763dba9c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/****************************************************************************/
2/*
3 * linux/fs/binfmt_flat.c
4 *
5 * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
6 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
7 * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
8 * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
9 * based heavily on:
10 *
11 * linux/fs/binfmt_aout.c:
12 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
13 * linux/fs/binfmt_flat.c for 2.0 kernel
14 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
15 * JAN/99 -- coded full program relocation (gerg@snapgear.com)
16 */
17
18#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/kernel.h>
20#include <linux/sched.h>
21#include <linux/mm.h>
22#include <linux/mman.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/errno.h>
24#include <linux/signal.h>
25#include <linux/string.h>
26#include <linux/fs.h>
27#include <linux/file.h>
28#include <linux/stat.h>
29#include <linux/fcntl.h>
30#include <linux/ptrace.h>
31#include <linux/user.h>
32#include <linux/slab.h>
33#include <linux/binfmts.h>
34#include <linux/personality.h>
35#include <linux/init.h>
36#include <linux/flat.h>
Luke Yang1ad3dcc2006-03-25 03:08:24 -080037#include <linux/syscalls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/byteorder.h>
40#include <asm/system.h>
41#include <asm/uaccess.h>
42#include <asm/unaligned.h>
43#include <asm/cacheflush.h>
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -070044#include <asm/page.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46/****************************************************************************/
47
48#if 0
49#define DEBUG 1
50#endif
51
52#ifdef DEBUG
53#define DBG_FLT(a...) printk(a)
54#else
55#define DBG_FLT(a...)
56#endif
57
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -070058/*
59 * User data (stack, data section and bss) needs to be aligned
60 * for the same reasons as SLAB memory is, and to the same amount.
61 * Avoid duplicating architecture specific code by using the same
62 * macro as with SLAB allocation:
63 */
64#ifdef ARCH_SLAB_MINALIGN
65#define FLAT_DATA_ALIGN (ARCH_SLAB_MINALIGN)
66#else
67#define FLAT_DATA_ALIGN (sizeof(void *))
68#endif
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070#define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
71#define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
72
73struct lib_info {
74 struct {
75 unsigned long start_code; /* Start of text segment */
76 unsigned long start_data; /* Start of data segment */
77 unsigned long start_brk; /* End of data segment */
78 unsigned long text_len; /* Length of text segment */
79 unsigned long entry; /* Start address for this module */
80 unsigned long build_date; /* When this one was compiled */
81 short loaded; /* Has this library been loaded? */
82 } lib_list[MAX_SHARED_LIBS];
83};
84
85#ifdef CONFIG_BINFMT_SHARED_FLAT
86static int load_flat_shared_library(int id, struct lib_info *p);
87#endif
88
89static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs);
Masami Hiramatsuf6151df2009-12-17 15:27:16 -080090static int flat_core_dump(struct coredump_params *cprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static struct linux_binfmt flat_format = {
93 .module = THIS_MODULE,
94 .load_binary = load_flat_binary,
95 .core_dump = flat_core_dump,
96 .min_coredump = PAGE_SIZE
97};
98
99/****************************************************************************/
100/*
101 * Routine writes a core dump image in the current directory.
102 * Currently only a stub-function.
103 */
104
Masami Hiramatsuf6151df2009-12-17 15:27:16 -0800105static int flat_core_dump(struct coredump_params *cprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106{
107 printk("Process %s:%d received signr %d and should have core dumped\n",
Masami Hiramatsuf6151df2009-12-17 15:27:16 -0800108 current->comm, current->pid, (int) cprm->signr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return(1);
110}
111
112/****************************************************************************/
113/*
114 * create_flat_tables() parses the env- and arg-strings in new user
115 * memory and creates the pointer tables from them, and puts their
116 * addresses on the "stack", returning the new stack pointer value.
117 */
118
119static unsigned long create_flat_tables(
120 unsigned long pp,
121 struct linux_binprm * bprm)
122{
123 unsigned long *argv,*envp;
124 unsigned long * sp;
125 char * p = (char*)pp;
126 int argc = bprm->argc;
127 int envc = bprm->envc;
Andrew Morton0e647c02007-10-16 23:27:26 -0700128 char uninitialized_var(dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -0700130 sp = (unsigned long *)p;
131 sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
132 sp = (unsigned long *) ((unsigned long)sp & -FLAT_DATA_ALIGN);
133 argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0);
134 envp = argv + (argc + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 if (flat_argvp_envp_on_stack()) {
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -0700137 put_user((unsigned long) envp, sp + 2);
138 put_user((unsigned long) argv, sp + 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 }
140
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -0700141 put_user(argc, sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 current->mm->arg_start = (unsigned long) p;
143 while (argc-->0) {
144 put_user((unsigned long) p, argv++);
145 do {
146 get_user(dummy, p); p++;
147 } while (dummy);
148 }
149 put_user((unsigned long) NULL, argv);
150 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
151 while (envc-->0) {
152 put_user((unsigned long)p, envp); envp++;
153 do {
154 get_user(dummy, p); p++;
155 } while (dummy);
156 }
157 put_user((unsigned long) NULL, envp);
158 current->mm->env_end = (unsigned long) p;
159 return (unsigned long)sp;
160}
161
162/****************************************************************************/
163
164#ifdef CONFIG_BINFMT_ZFLAT
165
166#include <linux/zlib.h>
167
168#define LBUFSIZE 4000
169
170/* gzip flag byte */
171#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
172#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
173#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
174#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
175#define COMMENT 0x10 /* bit 4 set: file comment present */
176#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
177#define RESERVED 0xC0 /* bit 6,7: reserved */
178
179static int decompress_exec(
180 struct linux_binprm *bprm,
181 unsigned long offset,
182 char *dst,
183 long len,
184 int fd)
185{
186 unsigned char *buf;
187 z_stream strm;
188 loff_t fpos;
189 int ret, retval;
190
191 DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
192
193 memset(&strm, 0, sizeof(strm));
194 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
195 if (strm.workspace == NULL) {
196 DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
197 return -ENOMEM;
198 }
199 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
200 if (buf == NULL) {
201 DBG_FLT("binfmt_flat: no memory for read buffer\n");
202 retval = -ENOMEM;
203 goto out_free;
204 }
205
206 /* Read in first chunk of data and parse gzip header. */
207 fpos = offset;
208 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
209
210 strm.next_in = buf;
211 strm.avail_in = ret;
212 strm.total_in = 0;
213
214 retval = -ENOEXEC;
215
216 /* Check minimum size -- gzip header */
217 if (ret < 10) {
218 DBG_FLT("binfmt_flat: file too small?\n");
219 goto out_free_buf;
220 }
221
222 /* Check gzip magic number */
223 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
224 DBG_FLT("binfmt_flat: unknown compression magic?\n");
225 goto out_free_buf;
226 }
227
228 /* Check gzip method */
229 if (buf[2] != 8) {
230 DBG_FLT("binfmt_flat: unknown compression method?\n");
231 goto out_free_buf;
232 }
233 /* Check gzip flags */
234 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
235 (buf[3] & RESERVED)) {
236 DBG_FLT("binfmt_flat: unknown flags?\n");
237 goto out_free_buf;
238 }
239
240 ret = 10;
241 if (buf[3] & EXTRA_FIELD) {
242 ret += 2 + buf[10] + (buf[11] << 8);
Volodymyr G. Lukiianykf4cfb182008-10-15 22:01:15 -0700243 if (unlikely(LBUFSIZE <= ret)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
245 goto out_free_buf;
246 }
247 }
248 if (buf[3] & ORIG_NAME) {
Volodymyr G. Lukiianykf4cfb182008-10-15 22:01:15 -0700249 while (ret < LBUFSIZE && buf[ret++] != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 ;
251 if (unlikely(LBUFSIZE == ret)) {
252 DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
253 goto out_free_buf;
254 }
255 }
256 if (buf[3] & COMMENT) {
Volodymyr G. Lukiianykf4cfb182008-10-15 22:01:15 -0700257 while (ret < LBUFSIZE && buf[ret++] != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 ;
259 if (unlikely(LBUFSIZE == ret)) {
260 DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
261 goto out_free_buf;
262 }
263 }
264
265 strm.next_in += ret;
266 strm.avail_in -= ret;
267
268 strm.next_out = dst;
269 strm.avail_out = len;
270 strm.total_out = 0;
271
272 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
273 DBG_FLT("binfmt_flat: zlib init failed?\n");
274 goto out_free_buf;
275 }
276
277 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
278 ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
279 if (ret <= 0)
280 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 len -= ret;
282
283 strm.next_in = buf;
284 strm.avail_in = ret;
285 strm.total_in = 0;
286 }
287
288 if (ret < 0) {
289 DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
290 ret, strm.msg);
291 goto out_zlib;
292 }
293
294 retval = 0;
295out_zlib:
296 zlib_inflateEnd(&strm);
297out_free_buf:
298 kfree(buf);
299out_free:
300 kfree(strm.workspace);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 return retval;
302}
303
304#endif /* CONFIG_BINFMT_ZFLAT */
305
306/****************************************************************************/
307
308static unsigned long
309calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
310{
311 unsigned long addr;
312 int id;
313 unsigned long start_brk;
314 unsigned long start_data;
315 unsigned long text_len;
316 unsigned long start_code;
317
318#ifdef CONFIG_BINFMT_SHARED_FLAT
319 if (r == 0)
320 id = curid; /* Relocs of 0 are always self referring */
321 else {
322 id = (r >> 24) & 0xff; /* Find ID for this reloc */
323 r &= 0x00ffffff; /* Trim ID off here */
324 }
325 if (id >= MAX_SHARED_LIBS) {
326 printk("BINFMT_FLAT: reference 0x%x to shared library %d",
327 (unsigned) r, id);
328 goto failed;
329 }
330 if (curid != id) {
331 if (internalp) {
332 printk("BINFMT_FLAT: reloc address 0x%x not in same module "
333 "(%d != %d)", (unsigned) r, curid, id);
334 goto failed;
335 } else if ( ! p->lib_list[id].loaded &&
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700336 IS_ERR_VALUE(load_flat_shared_library(id, p))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 printk("BINFMT_FLAT: failed to load library %d", id);
338 goto failed;
339 }
340 /* Check versioning information (i.e. time stamps) */
341 if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
342 p->lib_list[curid].build_date < p->lib_list[id].build_date) {
343 printk("BINFMT_FLAT: library %d is younger than %d", id, curid);
344 goto failed;
345 }
346 }
347#else
348 id = 0;
349#endif
350
351 start_brk = p->lib_list[id].start_brk;
352 start_data = p->lib_list[id].start_data;
353 start_code = p->lib_list[id].start_code;
354 text_len = p->lib_list[id].text_len;
355
356 if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
357 printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)",
358 (int) r,(int)(start_brk-start_code),(int)text_len);
359 goto failed;
360 }
361
362 if (r < text_len) /* In text segment */
363 addr = r + start_code;
364 else /* In data segment */
365 addr = r - text_len + start_data;
366
367 /* Range checked already above so doing the range tests is redundant...*/
368 return(addr);
369
370failed:
371 printk(", killing %s!\n", current->comm);
372 send_sig(SIGSEGV, current, 0);
373
374 return RELOC_FAILED;
375}
376
377/****************************************************************************/
378
379void old_reloc(unsigned long rl)
380{
381#ifdef DEBUG
382 char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
383#endif
384 flat_v2_reloc_t r;
385 unsigned long *ptr;
386
387 r.value = rl;
388#if defined(CONFIG_COLDFIRE)
389 ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset);
390#else
391 ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset);
392#endif
393
394#ifdef DEBUG
395 printk("Relocation of variable at DATASEG+%x "
396 "(address %p, currently %x) into segment %s\n",
397 r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]);
398#endif
399
400 switch (r.reloc.type) {
401 case OLD_FLAT_RELOC_TYPE_TEXT:
402 *ptr += current->mm->start_code;
403 break;
404 case OLD_FLAT_RELOC_TYPE_DATA:
405 *ptr += current->mm->start_data;
406 break;
407 case OLD_FLAT_RELOC_TYPE_BSS:
408 *ptr += current->mm->end_data;
409 break;
410 default:
411 printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type);
412 break;
413 }
414
415#ifdef DEBUG
416 printk("Relocation became %x\n", (int)*ptr);
417#endif
418}
419
420/****************************************************************************/
421
422static int load_flat_file(struct linux_binprm * bprm,
423 struct lib_info *libinfo, int id, unsigned long *extra_stack)
424{
425 struct flat_hdr * hdr;
426 unsigned long textpos = 0, datapos = 0, result;
427 unsigned long realdatastart = 0;
428 unsigned long text_len, data_len, bss_len, stack_len, flags;
David Howells0f3e4422009-01-08 12:04:47 +0000429 unsigned long len, memp = 0;
430 unsigned long memp_size, extra, rlim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 unsigned long *reloc = 0, *rp;
432 struct inode *inode;
433 int i, rev, relocs = 0;
434 loff_t fpos;
435 unsigned long start_code, end_code;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800436 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
438 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800439 inode = bprm->file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 text_len = ntohl(hdr->data_start);
442 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
443 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
444 stack_len = ntohl(hdr->stack_size);
445 if (extra_stack) {
446 stack_len += *extra_stack;
447 *extra_stack = stack_len;
448 }
449 relocs = ntohl(hdr->reloc_count);
450 flags = ntohl(hdr->flags);
451 rev = ntohl(hdr->rev);
452
Greg Ungerer845884d2006-01-10 16:59:37 +1000453 if (strncmp(hdr->magic, "bFLT", 4)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 /*
Mike Frysingere2a366d2008-02-14 19:31:29 -0800455 * Previously, here was a printk to tell people
456 * "BINFMT_FLAT: bad header magic".
457 * But for the kernel which also use ELF FD-PIC format, this
458 * error message is confusing.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 * because a lot of people do not manage to produce good
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 */
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800461 ret = -ENOEXEC;
462 goto err;
Greg Ungerer845884d2006-01-10 16:59:37 +1000463 }
464
465 if (flags & FLAT_FLAG_KTRACE)
466 printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
467
468 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
Andrew Morton0e647c02007-10-16 23:27:26 -0700469 printk("BINFMT_FLAT: bad flat file version 0x%x (supported "
470 "0x%lx and 0x%lx)\n",
471 rev, FLAT_VERSION, OLD_FLAT_VERSION);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800472 ret = -ENOEXEC;
473 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 }
475
476 /* Don't allow old format executables to use shared libraries */
477 if (rev == OLD_FLAT_VERSION && id != 0) {
478 printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n",
479 (int) FLAT_VERSION);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800480 ret = -ENOEXEC;
481 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483
484 /*
485 * fix up the flags for the older format, there were all kinds
486 * of endian hacks, this only works for the simple cases
487 */
488 if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
489 flags = FLAT_FLAG_RAM;
490
491#ifndef CONFIG_BINFMT_ZFLAT
492 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
493 printk("Support for ZFLAT executables is not enabled.\n");
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800494 ret = -ENOEXEC;
495 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
497#endif
498
499 /*
500 * Check initial limits. This avoids letting people circumvent
501 * size limits imposed on them by creating programs with large
502 * arrays in the data or bss.
503 */
504 rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
505 if (rlim >= RLIM_INFINITY)
506 rlim = ~0;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800507 if (data_len + bss_len > rlim) {
508 ret = -ENOMEM;
509 goto err;
510 }
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 /* Flush all traces of the currently running executable */
513 if (id == 0) {
514 result = flush_old_exec(bprm);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800515 if (result) {
516 ret = result;
Andrew Mortondf889122006-05-20 15:00:01 -0700517 goto err;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800518 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 /* OK, This is the point of no return */
Malcolm Parsonsfcc18e82006-06-26 11:49:41 +1000521 set_personality(PER_LINUX_32BIT);
Linus Torvalds221af7f2010-01-28 22:14:42 -0800522 setup_new_exec(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 }
524
525 /*
526 * calculate the extra space we need to map in
527 */
Andrew Morton0e647c02007-10-16 23:27:26 -0700528 extra = max_t(unsigned long, bss_len + stack_len,
529 relocs * sizeof(unsigned long));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 /*
532 * there are a couple of cases here, the separate code/data
533 * case, and then the fully copied to RAM case which lumps
534 * it all together.
535 */
536 if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
537 /*
538 * this should give us a ROM ptr, but if it doesn't we don't
539 * really care
540 */
541 DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
542
543 down_write(&current->mm->mmap_sem);
Matt Helsley925d1c42008-04-29 01:01:36 -0700544 textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
545 MAP_PRIVATE|MAP_EXECUTABLE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 up_write(&current->mm->mmap_sem);
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700547 if (!textpos || IS_ERR_VALUE(textpos)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 if (!textpos)
549 textpos = (unsigned long) -ENOMEM;
550 printk("Unable to mmap process text, errno %d\n", (int)-textpos);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800551 ret = textpos;
Andrew Mortondf889122006-05-20 15:00:01 -0700552 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554
Greg Ungerer72613e5f2007-02-07 12:03:08 +1000555 len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
David Howells0f3e4422009-01-08 12:04:47 +0000556 len = PAGE_ALIGN(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 down_write(&current->mm->mmap_sem);
Greg Ungerer72613e5f2007-02-07 12:03:08 +1000558 realdatastart = do_mmap(0, 0, len,
559 PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 up_write(&current->mm->mmap_sem);
561
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700562 if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 if (!realdatastart)
564 realdatastart = (unsigned long) -ENOMEM;
565 printk("Unable to allocate RAM for process data, errno %d\n",
Greg Ungererc287ef12007-06-08 13:46:43 -0700566 (int)-realdatastart);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 do_munmap(current->mm, textpos, text_len);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800568 ret = realdatastart;
Andrew Mortondf889122006-05-20 15:00:01 -0700569 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 }
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -0700571 datapos = ALIGN(realdatastart +
572 MAX_SHARED_LIBS * sizeof(unsigned long),
573 FLAT_DATA_ALIGN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
575 DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
576 (int)(data_len + bss_len + stack_len), (int)datapos);
577
578 fpos = ntohl(hdr->data_start);
579#ifdef CONFIG_BINFMT_ZFLAT
580 if (flags & FLAT_FLAG_GZDATA) {
581 result = decompress_exec(bprm, fpos, (char *) datapos,
582 data_len + (relocs * sizeof(unsigned long)), 0);
583 } else
584#endif
585 {
586 result = bprm->file->f_op->read(bprm->file, (char *) datapos,
587 data_len + (relocs * sizeof(unsigned long)), &fpos);
588 }
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700589 if (IS_ERR_VALUE(result)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 printk("Unable to read data+bss, errno %d\n", (int)-result);
591 do_munmap(current->mm, textpos, text_len);
592 do_munmap(current->mm, realdatastart, data_len + extra);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800593 ret = result;
Andrew Mortondf889122006-05-20 15:00:01 -0700594 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
596
597 reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len));
598 memp = realdatastart;
David Howells0f3e4422009-01-08 12:04:47 +0000599 memp_size = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 } else {
601
Greg Ungerer72613e5f2007-02-07 12:03:08 +1000602 len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
David Howells0f3e4422009-01-08 12:04:47 +0000603 len = PAGE_ALIGN(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 down_write(&current->mm->mmap_sem);
Greg Ungerer72613e5f2007-02-07 12:03:08 +1000605 textpos = do_mmap(0, 0, len,
606 PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 up_write(&current->mm->mmap_sem);
Greg Ungerer72613e5f2007-02-07 12:03:08 +1000608
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700609 if (!textpos || IS_ERR_VALUE(textpos)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 if (!textpos)
611 textpos = (unsigned long) -ENOMEM;
612 printk("Unable to allocate RAM for process text/data, errno %d\n",
613 (int)-textpos);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800614 ret = textpos;
Andrew Mortondf889122006-05-20 15:00:01 -0700615 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 }
617
618 realdatastart = textpos + ntohl(hdr->data_start);
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -0700619 datapos = ALIGN(realdatastart +
620 MAX_SHARED_LIBS * sizeof(unsigned long),
621 FLAT_DATA_ALIGN);
622
623 reloc = (unsigned long *)
624 (datapos + (ntohl(hdr->reloc_start) - text_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 memp = textpos;
David Howells0f3e4422009-01-08 12:04:47 +0000626 memp_size = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627#ifdef CONFIG_BINFMT_ZFLAT
628 /*
629 * load it all in and treat it like a RAM load from now on
630 */
631 if (flags & FLAT_FLAG_GZIP) {
632 result = decompress_exec(bprm, sizeof (struct flat_hdr),
633 (((char *) textpos) + sizeof (struct flat_hdr)),
634 (text_len + data_len + (relocs * sizeof(unsigned long))
635 - sizeof (struct flat_hdr)),
636 0);
637 memmove((void *) datapos, (void *) realdatastart,
638 data_len + (relocs * sizeof(unsigned long)));
639 } else if (flags & FLAT_FLAG_GZDATA) {
640 fpos = 0;
641 result = bprm->file->f_op->read(bprm->file,
642 (char *) textpos, text_len, &fpos);
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700643 if (!IS_ERR_VALUE(result))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 result = decompress_exec(bprm, text_len, (char *) datapos,
645 data_len + (relocs * sizeof(unsigned long)), 0);
646 }
647 else
648#endif
649 {
650 fpos = 0;
651 result = bprm->file->f_op->read(bprm->file,
652 (char *) textpos, text_len, &fpos);
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700653 if (!IS_ERR_VALUE(result)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 fpos = ntohl(hdr->data_start);
655 result = bprm->file->f_op->read(bprm->file, (char *) datapos,
656 data_len + (relocs * sizeof(unsigned long)), &fpos);
657 }
658 }
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700659 if (IS_ERR_VALUE(result)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 printk("Unable to read code+data+bss, errno %d\n",(int)-result);
661 do_munmap(current->mm, textpos, text_len + data_len + extra +
662 MAX_SHARED_LIBS * sizeof(unsigned long));
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800663 ret = result;
Andrew Mortondf889122006-05-20 15:00:01 -0700664 goto err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 }
666 }
667
668 if (flags & FLAT_FLAG_KTRACE)
669 printk("Mapping is %x, Entry point is %x, data_start is %x\n",
670 (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
671
672 /* The main program needs a little extra setup in the task structure */
673 start_code = textpos + sizeof (struct flat_hdr);
674 end_code = textpos + text_len;
675 if (id == 0) {
676 current->mm->start_code = start_code;
677 current->mm->end_code = end_code;
678 current->mm->start_data = datapos;
679 current->mm->end_data = datapos + data_len;
680 /*
681 * set up the brk stuff, uses any slack left in data/bss/stack
682 * allocation. We put the brk after the bss (between the bss
683 * and stack) like other platforms.
David Howells0f3e4422009-01-08 12:04:47 +0000684 * Userspace code relies on the stack pointer starting out at
685 * an address right at the end of a page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 */
687 current->mm->start_brk = datapos + data_len + bss_len;
688 current->mm->brk = (current->mm->start_brk + 3) & ~3;
David Howells0f3e4422009-01-08 12:04:47 +0000689 current->mm->context.end_brk = memp + memp_size - stack_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 }
691
692 if (flags & FLAT_FLAG_KTRACE)
693 printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
694 id ? "Lib" : "Load", bprm->filename,
695 (int) start_code, (int) end_code,
696 (int) datapos,
697 (int) (datapos + data_len),
698 (int) (datapos + data_len),
699 (int) (((datapos + data_len + bss_len) + 3) & ~3));
700
701 text_len -= sizeof(struct flat_hdr); /* the real code len */
702
703 /* Store the current module values into the global library structure */
704 libinfo->lib_list[id].start_code = start_code;
705 libinfo->lib_list[id].start_data = datapos;
706 libinfo->lib_list[id].start_brk = datapos + data_len + bss_len;
707 libinfo->lib_list[id].text_len = text_len;
708 libinfo->lib_list[id].loaded = 1;
709 libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
710 libinfo->lib_list[id].build_date = ntohl(hdr->build_date);
711
712 /*
713 * We just load the allocations into some temporary memory to
714 * help simplify all this mumbo jumbo
715 *
716 * We've got two different sections of relocation entries.
717 * The first is the GOT which resides at the begining of the data segment
718 * and is terminated with a -1. This one can be relocated in place.
719 * The second is the extra relocation entries tacked after the image's
720 * data segment. These require a little more processing as the entry is
721 * really an offset into the image which contains an offset into the
722 * image.
723 */
724 if (flags & FLAT_FLAG_GOTPIC) {
725 for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) {
726 unsigned long addr;
727 if (*rp) {
728 addr = calc_reloc(*rp, libinfo, id, 0);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800729 if (addr == RELOC_FAILED) {
730 ret = -ENOEXEC;
Andrew Mortondf889122006-05-20 15:00:01 -0700731 goto err;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800732 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 *rp = addr;
734 }
735 }
736 }
737
738 /*
739 * Now run through the relocation entries.
740 * We've got to be careful here as C++ produces relocatable zero
741 * entries in the constructor and destructor tables which are then
742 * tested for being not zero (which will always occur unless we're
743 * based from address zero). This causes an endless loop as __start
744 * is at zero. The solution used is to not relocate zero addresses.
745 * This has the negative side effect of not allowing a global data
746 * reference to be statically initialised to _stext (I've moved
747 * __start to address 4 so that is okay).
748 */
749 if (rev > OLD_FLAT_VERSION) {
Bernd Schmidtf9720202007-10-03 23:41:43 +0800750 unsigned long persistent = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 for (i=0; i < relocs; i++) {
752 unsigned long addr, relval;
753
754 /* Get the address of the pointer to be
755 relocated (of course, the address has to be
756 relocated first). */
757 relval = ntohl(reloc[i]);
Bernd Schmidtf9720202007-10-03 23:41:43 +0800758 if (flat_set_persistent (relval, &persistent))
759 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 addr = flat_get_relocate_addr(relval);
761 rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800762 if (rp == (unsigned long *)RELOC_FAILED) {
763 ret = -ENOEXEC;
Andrew Mortondf889122006-05-20 15:00:01 -0700764 goto err;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766
767 /* Get the pointer's value. */
Andrew Morton576bb9c2007-10-03 23:43:57 +0800768 addr = flat_get_addr_from_rp(rp, relval, flags,
769 &persistent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 if (addr != 0) {
771 /*
772 * Do the relocation. PIC relocs in the data section are
773 * already in target order
774 */
775 if ((flags & FLAT_FLAG_GOTPIC) == 0)
776 addr = ntohl(addr);
777 addr = calc_reloc(addr, libinfo, id, 0);
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800778 if (addr == RELOC_FAILED) {
779 ret = -ENOEXEC;
Andrew Mortondf889122006-05-20 15:00:01 -0700780 goto err;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800781 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783 /* Write back the relocated pointer. */
784 flat_put_addr_at_rp(rp, addr, relval);
785 }
786 }
787 } else {
788 for (i=0; i < relocs; i++)
789 old_reloc(ntohl(reloc[i]));
790 }
791
792 flush_icache_range(start_code, end_code);
793
794 /* zero the BSS, BRK and stack areas */
795 memset((void*)(datapos + data_len), 0, bss_len +
David Howells0f3e4422009-01-08 12:04:47 +0000796 (memp + memp_size - stack_len - /* end brk */
797 libinfo->lib_list[id].start_brk) + /* start brk */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 stack_len);
799
800 return 0;
Luke Yang1ad3dcc2006-03-25 03:08:24 -0800801err:
802 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803}
804
805
806/****************************************************************************/
807#ifdef CONFIG_BINFMT_SHARED_FLAT
808
809/*
810 * Load a shared library into memory. The library gets its own data
811 * segment (including bss) but not argv/argc/environ.
812 */
813
814static int load_flat_shared_library(int id, struct lib_info *libs)
815{
816 struct linux_binprm bprm;
817 int res;
818 char buf[16];
819
820 /* Create the file name */
821 sprintf(buf, "/lib/lib%d.so", id);
822
823 /* Open the file up */
824 bprm.filename = buf;
825 bprm.file = open_exec(bprm.filename);
826 res = PTR_ERR(bprm.file);
827 if (IS_ERR(bprm.file))
828 return res;
829
Linus Torvalds34406252009-08-06 15:09:34 -0700830 bprm.cred = prepare_exec_creds();
831 res = -ENOMEM;
832 if (!bprm.cred)
833 goto out;
834
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 res = prepare_binprm(&bprm);
836
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700837 if (!IS_ERR_VALUE(res))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 res = load_flat_file(&bprm, libs, id, NULL);
Linus Torvalds34406252009-08-06 15:09:34 -0700839
840 abort_creds(bprm.cred);
841
842out:
843 allow_write_access(bprm.file);
844 fput(bprm.file);
845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 return(res);
847}
848
849#endif /* CONFIG_BINFMT_SHARED_FLAT */
850/****************************************************************************/
851
852/*
853 * These are the functions used to load flat style executables and shared
854 * libraries. There is no binary dependent code anywhere else.
855 */
856
857static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs)
858{
859 struct lib_info libinfo;
860 unsigned long p = bprm->p;
861 unsigned long stack_len;
862 unsigned long start_addr;
863 unsigned long *sp;
864 int res;
865 int i, j;
866
867 memset(&libinfo, 0, sizeof(libinfo));
868 /*
869 * We have to add the size of our arguments to our stack size
870 * otherwise it's too easy for users to create stack overflows
871 * by passing in a huge argument list. And yes, we have to be
872 * pedantic and include space for the argv/envp array as it may have
873 * a lot of entries.
874 */
875#define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *))
876 stack_len = TOP_OF_ARGS - bprm->p; /* the strings */
877 stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
878 stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
Oskar Schirmerc3dc5be2009-05-28 14:34:31 -0700879 stack_len += FLAT_DATA_ALIGN - 1; /* reserve for upcoming alignment */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 res = load_flat_file(bprm, &libinfo, 0, &stack_len);
Mike Frysinger0b8c78f2009-09-23 15:57:07 -0700882 if (IS_ERR_VALUE(res))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 return res;
884
885 /* Update data segment pointers for all libraries */
886 for (i=0; i<MAX_SHARED_LIBS; i++)
887 if (libinfo.lib_list[i].loaded)
888 for (j=0; j<MAX_SHARED_LIBS; j++)
889 (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] =
890 (libinfo.lib_list[j].loaded)?
891 libinfo.lib_list[j].start_data:UNLOADED_LIB;
892
David Howellsa6f76f22008-11-14 10:39:24 +1100893 install_exec_creds(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 current->flags &= ~PF_FORKNOEXEC;
895
896 set_binfmt(&flat_format);
897
898 p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
899 DBG_FLT("p=%x\n", (int)p);
900
901 /* copy the arg pages onto the stack, this could be more efficient :-) */
902 for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--)
903 * (char *) --p =
904 ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE];
905
906 sp = (unsigned long *) create_flat_tables(p, bprm);
907
908 /* Fake some return addresses to ensure the call chain will
909 * initialise library in order for us. We are required to call
910 * lib 1 first, then 2, ... and finally the main program (id 0).
911 */
912 start_addr = libinfo.lib_list[0].entry;
913
914#ifdef CONFIG_BINFMT_SHARED_FLAT
915 for (i = MAX_SHARED_LIBS-1; i>0; i--) {
916 if (libinfo.lib_list[i].loaded) {
917 /* Push previos first to call address */
918 --sp; put_user(start_addr, sp);
919 start_addr = libinfo.lib_list[i].entry;
920 }
921 }
922#endif
923
924 /* Stash our initial stack pointer into the mm structure */
925 current->mm->start_stack = (unsigned long )sp;
926
Takashi YOSHII74c27c42008-08-11 20:10:54 +0900927#ifdef FLAT_PLAT_INIT
928 FLAT_PLAT_INIT(regs);
929#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n",
931 (int)regs, (int)start_addr, (int)current->mm->start_stack);
932
933 start_thread(regs, start_addr, current->mm->start_stack);
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 return 0;
936}
937
938/****************************************************************************/
939
940static int __init init_flat_binfmt(void)
941{
942 return register_binfmt(&flat_format);
943}
944
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945/****************************************************************************/
946
947core_initcall(init_flat_binfmt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
949/****************************************************************************/