Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************/ |
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> | |
1da177e4 LT |
19 | #include <linux/kernel.h> |
20 | #include <linux/sched.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/mman.h> | |
1da177e4 LT |
23 | #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> | |
1ad3dcc0 | 37 | #include <linux/syscalls.h> |
1da177e4 LT |
38 | |
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> | |
c3dc5bec | 44 | #include <asm/page.h> |
1da177e4 LT |
45 | |
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 | ||
c3dc5bec OS |
58 | /* |
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 | ||
1da177e4 LT |
70 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
71 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
72 | ||
73 | struct 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 | |
86 | static int load_flat_shared_library(int id, struct lib_info *p); | |
87 | #endif | |
88 | ||
89 | static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs); | |
f6151dfe | 90 | static int flat_core_dump(struct coredump_params *cprm); |
1da177e4 | 91 | |
1da177e4 LT |
92 | static 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 | ||
f6151dfe | 105 | static int flat_core_dump(struct coredump_params *cprm) |
1da177e4 LT |
106 | { |
107 | printk("Process %s:%d received signr %d and should have core dumped\n", | |
f6151dfe | 108 | current->comm, current->pid, (int) cprm->signr); |
1da177e4 LT |
109 | 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 | ||
119 | static 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; | |
0e647c04 | 128 | char uninitialized_var(dummy); |
1da177e4 | 129 | |
c3dc5bec OS |
130 | 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); | |
1da177e4 | 135 | |
1da177e4 | 136 | if (flat_argvp_envp_on_stack()) { |
c3dc5bec OS |
137 | put_user((unsigned long) envp, sp + 2); |
138 | put_user((unsigned long) argv, sp + 1); | |
1da177e4 LT |
139 | } |
140 | ||
c3dc5bec | 141 | put_user(argc, sp); |
1da177e4 LT |
142 | 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 | ||
179 | static 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); | |
f4cfb18d | 243 | if (unlikely(LBUFSIZE <= ret)) { |
1da177e4 LT |
244 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); |
245 | goto out_free_buf; | |
246 | } | |
247 | } | |
248 | if (buf[3] & ORIG_NAME) { | |
f4cfb18d | 249 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 LT |
250 | ; |
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) { | |
f4cfb18d | 257 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 LT |
258 | ; |
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; | |
1da177e4 LT |
281 | 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; | |
295 | out_zlib: | |
296 | zlib_inflateEnd(&strm); | |
297 | out_free_buf: | |
298 | kfree(buf); | |
299 | out_free: | |
300 | kfree(strm.workspace); | |
1da177e4 LT |
301 | return retval; |
302 | } | |
303 | ||
304 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
305 | ||
306 | /****************************************************************************/ | |
307 | ||
308 | static unsigned long | |
309 | calc_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 && | |
0b8c78f2 | 336 | IS_ERR_VALUE(load_flat_shared_library(id, p))) { |
1da177e4 LT |
337 | 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 | ||
370 | failed: | |
371 | printk(", killing %s!\n", current->comm); | |
372 | send_sig(SIGSEGV, current, 0); | |
373 | ||
374 | return RELOC_FAILED; | |
375 | } | |
376 | ||
377 | /****************************************************************************/ | |
378 | ||
379 | void 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 | ||
422 | static 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; | |
0f3e442a DH |
429 | unsigned long len, memp = 0; |
430 | unsigned long memp_size, extra, rlim; | |
1da177e4 LT |
431 | 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; | |
1ad3dcc0 | 436 | int ret; |
1da177e4 LT |
437 | |
438 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
0f7fc9e4 | 439 | inode = bprm->file->f_path.dentry->d_inode; |
1da177e4 LT |
440 | |
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 | ||
845884d3 | 453 | if (strncmp(hdr->magic, "bFLT", 4)) { |
1da177e4 | 454 | /* |
e2a366dc MF |
455 | * 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. | |
1da177e4 | 459 | * because a lot of people do not manage to produce good |
1da177e4 | 460 | */ |
1ad3dcc0 LY |
461 | ret = -ENOEXEC; |
462 | goto err; | |
845884d3 GU |
463 | } |
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) { | |
0e647c04 AM |
469 | printk("BINFMT_FLAT: bad flat file version 0x%x (supported " |
470 | "0x%lx and 0x%lx)\n", | |
471 | rev, FLAT_VERSION, OLD_FLAT_VERSION); | |
1ad3dcc0 LY |
472 | ret = -ENOEXEC; |
473 | goto err; | |
1da177e4 LT |
474 | } |
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); | |
1ad3dcc0 LY |
480 | ret = -ENOEXEC; |
481 | goto err; | |
1da177e4 LT |
482 | } |
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"); | |
1ad3dcc0 LY |
494 | ret = -ENOEXEC; |
495 | goto err; | |
1da177e4 LT |
496 | } |
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 | */ | |
d554ed89 | 504 | rlim = rlimit(RLIMIT_DATA); |
1da177e4 LT |
505 | if (rlim >= RLIM_INFINITY) |
506 | rlim = ~0; | |
1ad3dcc0 LY |
507 | if (data_len + bss_len > rlim) { |
508 | ret = -ENOMEM; | |
509 | goto err; | |
510 | } | |
511 | ||
1da177e4 LT |
512 | /* Flush all traces of the currently running executable */ |
513 | if (id == 0) { | |
514 | result = flush_old_exec(bprm); | |
1ad3dcc0 LY |
515 | if (result) { |
516 | ret = result; | |
df88912a | 517 | goto err; |
1ad3dcc0 | 518 | } |
1da177e4 LT |
519 | |
520 | /* OK, This is the point of no return */ | |
fcc18e83 | 521 | set_personality(PER_LINUX_32BIT); |
221af7f8 | 522 | setup_new_exec(bprm); |
1da177e4 LT |
523 | } |
524 | ||
525 | /* | |
526 | * calculate the extra space we need to map in | |
527 | */ | |
0e647c04 AM |
528 | extra = max_t(unsigned long, bss_len + stack_len, |
529 | relocs * sizeof(unsigned long)); | |
1da177e4 LT |
530 | |
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(¤t->mm->mmap_sem); | |
925d1c40 MH |
544 | textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
545 | MAP_PRIVATE|MAP_EXECUTABLE, 0); | |
1da177e4 | 546 | up_write(¤t->mm->mmap_sem); |
0b8c78f2 | 547 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1da177e4 LT |
548 | if (!textpos) |
549 | textpos = (unsigned long) -ENOMEM; | |
550 | printk("Unable to mmap process text, errno %d\n", (int)-textpos); | |
1ad3dcc0 | 551 | ret = textpos; |
df88912a | 552 | goto err; |
1da177e4 LT |
553 | } |
554 | ||
72613e5f | 555 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
0f3e442a | 556 | len = PAGE_ALIGN(len); |
1da177e4 | 557 | down_write(¤t->mm->mmap_sem); |
72613e5f GU |
558 | realdatastart = do_mmap(0, 0, len, |
559 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); | |
1da177e4 LT |
560 | up_write(¤t->mm->mmap_sem); |
561 | ||
0b8c78f2 | 562 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
1da177e4 LT |
563 | if (!realdatastart) |
564 | realdatastart = (unsigned long) -ENOMEM; | |
565 | printk("Unable to allocate RAM for process data, errno %d\n", | |
c287ef1f | 566 | (int)-realdatastart); |
1da177e4 | 567 | do_munmap(current->mm, textpos, text_len); |
1ad3dcc0 | 568 | ret = realdatastart; |
df88912a | 569 | goto err; |
1da177e4 | 570 | } |
c3dc5bec OS |
571 | datapos = ALIGN(realdatastart + |
572 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
573 | FLAT_DATA_ALIGN); | |
1da177e4 LT |
574 | |
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 | } | |
0b8c78f2 | 589 | if (IS_ERR_VALUE(result)) { |
1da177e4 LT |
590 | 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); | |
1ad3dcc0 | 593 | ret = result; |
df88912a | 594 | goto err; |
1da177e4 LT |
595 | } |
596 | ||
597 | reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); | |
598 | memp = realdatastart; | |
0f3e442a | 599 | memp_size = len; |
1da177e4 LT |
600 | } else { |
601 | ||
72613e5f | 602 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
0f3e442a | 603 | len = PAGE_ALIGN(len); |
1da177e4 | 604 | down_write(¤t->mm->mmap_sem); |
72613e5f GU |
605 | textpos = do_mmap(0, 0, len, |
606 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); | |
1da177e4 | 607 | up_write(¤t->mm->mmap_sem); |
72613e5f | 608 | |
0b8c78f2 | 609 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1da177e4 LT |
610 | if (!textpos) |
611 | textpos = (unsigned long) -ENOMEM; | |
612 | printk("Unable to allocate RAM for process text/data, errno %d\n", | |
613 | (int)-textpos); | |
1ad3dcc0 | 614 | ret = textpos; |
df88912a | 615 | goto err; |
1da177e4 LT |
616 | } |
617 | ||
618 | realdatastart = textpos + ntohl(hdr->data_start); | |
c3dc5bec OS |
619 | 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)); | |
1da177e4 | 625 | memp = textpos; |
0f3e442a | 626 | memp_size = len; |
1da177e4 LT |
627 | #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); | |
0b8c78f2 | 643 | if (!IS_ERR_VALUE(result)) |
1da177e4 LT |
644 | 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); | |
0b8c78f2 | 653 | if (!IS_ERR_VALUE(result)) { |
1da177e4 LT |
654 | 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 | } | |
0b8c78f2 | 659 | if (IS_ERR_VALUE(result)) { |
1da177e4 LT |
660 | 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)); | |
1ad3dcc0 | 663 | ret = result; |
df88912a | 664 | goto err; |
1da177e4 LT |
665 | } |
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. | |
0f3e442a DH |
684 | * Userspace code relies on the stack pointer starting out at |
685 | * an address right at the end of a page. | |
1da177e4 LT |
686 | */ |
687 | current->mm->start_brk = datapos + data_len + bss_len; | |
688 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
0f3e442a | 689 | current->mm->context.end_brk = memp + memp_size - stack_len; |
1da177e4 LT |
690 | } |
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); | |
1ad3dcc0 LY |
729 | if (addr == RELOC_FAILED) { |
730 | ret = -ENOEXEC; | |
df88912a | 731 | goto err; |
1ad3dcc0 | 732 | } |
1da177e4 LT |
733 | *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) { | |
f9720205 | 750 | unsigned long persistent = 0; |
1da177e4 LT |
751 | 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]); | |
f9720205 BS |
758 | if (flat_set_persistent (relval, &persistent)) |
759 | continue; | |
1da177e4 LT |
760 | addr = flat_get_relocate_addr(relval); |
761 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); | |
1ad3dcc0 LY |
762 | if (rp == (unsigned long *)RELOC_FAILED) { |
763 | ret = -ENOEXEC; | |
df88912a | 764 | goto err; |
1ad3dcc0 | 765 | } |
1da177e4 LT |
766 | |
767 | /* Get the pointer's value. */ | |
576bb9ce AM |
768 | addr = flat_get_addr_from_rp(rp, relval, flags, |
769 | &persistent); | |
1da177e4 LT |
770 | 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); | |
1ad3dcc0 LY |
778 | if (addr == RELOC_FAILED) { |
779 | ret = -ENOEXEC; | |
df88912a | 780 | goto err; |
1ad3dcc0 | 781 | } |
1da177e4 LT |
782 | |
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 + | |
0f3e442a DH |
796 | (memp + memp_size - stack_len - /* end brk */ |
797 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
1da177e4 LT |
798 | stack_len); |
799 | ||
800 | return 0; | |
1ad3dcc0 LY |
801 | err: |
802 | return ret; | |
1da177e4 LT |
803 | } |
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 | ||
814 | static 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 | ||
3440625d LT |
830 | bprm.cred = prepare_exec_creds(); |
831 | res = -ENOMEM; | |
832 | if (!bprm.cred) | |
833 | goto out; | |
834 | ||
1da177e4 LT |
835 | res = prepare_binprm(&bprm); |
836 | ||
0b8c78f2 | 837 | if (!IS_ERR_VALUE(res)) |
1da177e4 | 838 | res = load_flat_file(&bprm, libs, id, NULL); |
3440625d LT |
839 | |
840 | abort_creds(bprm.cred); | |
841 | ||
842 | out: | |
843 | allow_write_access(bprm.file); | |
844 | fput(bprm.file); | |
845 | ||
1da177e4 LT |
846 | 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 | ||
857 | static 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 */ | |
c3dc5bec | 879 | stack_len += FLAT_DATA_ALIGN - 1; /* reserve for upcoming alignment */ |
1da177e4 LT |
880 | |
881 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); | |
0b8c78f2 | 882 | if (IS_ERR_VALUE(res)) |
1da177e4 LT |
883 | 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 | ||
a6f76f23 | 893 | install_exec_creds(bprm); |
1da177e4 LT |
894 | 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 | ||
74c27c43 TY |
927 | #ifdef FLAT_PLAT_INIT |
928 | FLAT_PLAT_INIT(regs); | |
929 | #endif | |
1da177e4 LT |
930 | 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 | ||
1da177e4 LT |
935 | return 0; |
936 | } | |
937 | ||
938 | /****************************************************************************/ | |
939 | ||
940 | static int __init init_flat_binfmt(void) | |
941 | { | |
942 | return register_binfmt(&flat_format); | |
943 | } | |
944 | ||
1da177e4 LT |
945 | /****************************************************************************/ |
946 | ||
947 | core_initcall(init_flat_binfmt); | |
1da177e4 LT |
948 | |
949 | /****************************************************************************/ |