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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 | ||
1da177e4 LT |
18 | #include <linux/kernel.h> |
19 | #include <linux/sched.h> | |
20 | #include <linux/mm.h> | |
21 | #include <linux/mman.h> | |
1da177e4 LT |
22 | #include <linux/errno.h> |
23 | #include <linux/signal.h> | |
24 | #include <linux/string.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/file.h> | |
1da177e4 LT |
27 | #include <linux/ptrace.h> |
28 | #include <linux/user.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/binfmts.h> | |
31 | #include <linux/personality.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/flat.h> | |
13c3f50c | 34 | #include <linux/uaccess.h> |
1da177e4 LT |
35 | |
36 | #include <asm/byteorder.h> | |
1da177e4 LT |
37 | #include <asm/unaligned.h> |
38 | #include <asm/cacheflush.h> | |
c3dc5bec | 39 | #include <asm/page.h> |
1da177e4 LT |
40 | |
41 | /****************************************************************************/ | |
42 | ||
43 | #if 0 | |
44 | #define DEBUG 1 | |
45 | #endif | |
46 | ||
47 | #ifdef DEBUG | |
48 | #define DBG_FLT(a...) printk(a) | |
49 | #else | |
50 | #define DBG_FLT(a...) | |
51 | #endif | |
52 | ||
c3dc5bec | 53 | /* |
2e94de8a MF |
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. | |
58 | */ | |
59 | #define FLAT_DATA_ALIGN (0x20) | |
60 | ||
61 | /* | |
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. | |
c3dc5bec | 65 | */ |
2952095c | 66 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
c3dc5bec | 67 | |
1da177e4 LT |
68 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
69 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
70 | ||
71 | struct lib_info { | |
72 | struct { | |
73 | unsigned long start_code; /* Start of text segment */ | |
74 | unsigned long start_data; /* Start of data segment */ | |
75 | unsigned long start_brk; /* End of data segment */ | |
76 | unsigned long text_len; /* Length of text segment */ | |
77 | unsigned long entry; /* Start address for this module */ | |
78 | unsigned long build_date; /* When this one was compiled */ | |
13c3f50c | 79 | bool loaded; /* Has this library been loaded? */ |
1da177e4 LT |
80 | } lib_list[MAX_SHARED_LIBS]; |
81 | }; | |
82 | ||
83 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
84 | static int load_flat_shared_library(int id, struct lib_info *p); | |
85 | #endif | |
86 | ||
71613c3b | 87 | static int load_flat_binary(struct linux_binprm *); |
f6151dfe | 88 | static int flat_core_dump(struct coredump_params *cprm); |
1da177e4 | 89 | |
1da177e4 LT |
90 | static struct linux_binfmt flat_format = { |
91 | .module = THIS_MODULE, | |
92 | .load_binary = load_flat_binary, | |
93 | .core_dump = flat_core_dump, | |
94 | .min_coredump = PAGE_SIZE | |
95 | }; | |
96 | ||
97 | /****************************************************************************/ | |
98 | /* | |
99 | * Routine writes a core dump image in the current directory. | |
100 | * Currently only a stub-function. | |
101 | */ | |
102 | ||
f6151dfe | 103 | static int flat_core_dump(struct coredump_params *cprm) |
1da177e4 LT |
104 | { |
105 | printk("Process %s:%d received signr %d and should have core dumped\n", | |
13c3f50c NP |
106 | current->comm, current->pid, cprm->siginfo->si_signo); |
107 | return 1; | |
1da177e4 LT |
108 | } |
109 | ||
110 | /****************************************************************************/ | |
111 | /* | |
112 | * create_flat_tables() parses the env- and arg-strings in new user | |
113 | * memory and creates the pointer tables from them, and puts their | |
114 | * addresses on the "stack", returning the new stack pointer value. | |
115 | */ | |
116 | ||
117 | static unsigned long create_flat_tables( | |
118 | unsigned long pp, | |
13c3f50c | 119 | struct linux_binprm *bprm) |
1da177e4 | 120 | { |
13c3f50c NP |
121 | unsigned long *argv, *envp; |
122 | unsigned long *sp; | |
123 | char *p = (char *)pp; | |
1da177e4 LT |
124 | int argc = bprm->argc; |
125 | int envc = bprm->envc; | |
0e647c04 | 126 | char uninitialized_var(dummy); |
1da177e4 | 127 | |
c3dc5bec OS |
128 | sp = (unsigned long *)p; |
129 | sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); | |
2e94de8a | 130 | sp = (unsigned long *) ((unsigned long)sp & -FLAT_STACK_ALIGN); |
c3dc5bec OS |
131 | argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
132 | envp = argv + (argc + 1); | |
1da177e4 | 133 | |
1da177e4 | 134 | if (flat_argvp_envp_on_stack()) { |
c3dc5bec OS |
135 | put_user((unsigned long) envp, sp + 2); |
136 | put_user((unsigned long) argv, sp + 1); | |
1da177e4 LT |
137 | } |
138 | ||
c3dc5bec | 139 | put_user(argc, sp); |
1da177e4 | 140 | current->mm->arg_start = (unsigned long) p; |
13c3f50c | 141 | while (argc-- > 0) { |
1da177e4 LT |
142 | put_user((unsigned long) p, argv++); |
143 | do { | |
144 | get_user(dummy, p); p++; | |
145 | } while (dummy); | |
146 | } | |
147 | put_user((unsigned long) NULL, argv); | |
148 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; | |
13c3f50c | 149 | while (envc-- > 0) { |
1da177e4 LT |
150 | put_user((unsigned long)p, envp); envp++; |
151 | do { | |
152 | get_user(dummy, p); p++; | |
153 | } while (dummy); | |
154 | } | |
155 | put_user((unsigned long) NULL, envp); | |
156 | current->mm->env_end = (unsigned long) p; | |
157 | return (unsigned long)sp; | |
158 | } | |
159 | ||
160 | /****************************************************************************/ | |
161 | ||
162 | #ifdef CONFIG_BINFMT_ZFLAT | |
163 | ||
164 | #include <linux/zlib.h> | |
165 | ||
166 | #define LBUFSIZE 4000 | |
167 | ||
168 | /* gzip flag byte */ | |
169 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
170 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
171 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
172 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
173 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
174 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
175 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
176 | ||
177 | static int decompress_exec( | |
178 | struct linux_binprm *bprm, | |
179 | unsigned long offset, | |
180 | char *dst, | |
181 | long len, | |
182 | int fd) | |
183 | { | |
184 | unsigned char *buf; | |
185 | z_stream strm; | |
186 | loff_t fpos; | |
187 | int ret, retval; | |
188 | ||
13c3f50c | 189 | DBG_FLT("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len); |
1da177e4 LT |
190 | |
191 | memset(&strm, 0, sizeof(strm)); | |
192 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
193 | if (strm.workspace == NULL) { | |
194 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); | |
195 | return -ENOMEM; | |
196 | } | |
197 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); | |
198 | if (buf == NULL) { | |
199 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); | |
200 | retval = -ENOMEM; | |
201 | goto out_free; | |
202 | } | |
203 | ||
204 | /* Read in first chunk of data and parse gzip header. */ | |
205 | fpos = offset; | |
3dc20cb2 | 206 | ret = kernel_read(bprm->file, offset, buf, LBUFSIZE); |
1da177e4 LT |
207 | |
208 | strm.next_in = buf; | |
209 | strm.avail_in = ret; | |
210 | strm.total_in = 0; | |
3dc20cb2 | 211 | fpos += ret; |
1da177e4 LT |
212 | |
213 | retval = -ENOEXEC; | |
214 | ||
215 | /* Check minimum size -- gzip header */ | |
216 | if (ret < 10) { | |
217 | DBG_FLT("binfmt_flat: file too small?\n"); | |
218 | goto out_free_buf; | |
219 | } | |
220 | ||
221 | /* Check gzip magic number */ | |
222 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
223 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); | |
224 | goto out_free_buf; | |
225 | } | |
226 | ||
227 | /* Check gzip method */ | |
228 | if (buf[2] != 8) { | |
229 | DBG_FLT("binfmt_flat: unknown compression method?\n"); | |
230 | goto out_free_buf; | |
231 | } | |
232 | /* Check gzip flags */ | |
233 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
234 | (buf[3] & RESERVED)) { | |
235 | DBG_FLT("binfmt_flat: unknown flags?\n"); | |
236 | goto out_free_buf; | |
237 | } | |
238 | ||
239 | ret = 10; | |
240 | if (buf[3] & EXTRA_FIELD) { | |
241 | ret += 2 + buf[10] + (buf[11] << 8); | |
13c3f50c | 242 | if (unlikely(ret >= LBUFSIZE)) { |
1da177e4 LT |
243 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); |
244 | goto out_free_buf; | |
245 | } | |
246 | } | |
247 | if (buf[3] & ORIG_NAME) { | |
f4cfb18d | 248 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 249 | ; |
13c3f50c | 250 | if (unlikely(ret == LBUFSIZE)) { |
1da177e4 LT |
251 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); |
252 | goto out_free_buf; | |
253 | } | |
254 | } | |
255 | if (buf[3] & COMMENT) { | |
f4cfb18d | 256 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 257 | ; |
13c3f50c | 258 | if (unlikely(ret == LBUFSIZE)) { |
1da177e4 LT |
259 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); |
260 | goto out_free_buf; | |
261 | } | |
262 | } | |
263 | ||
264 | strm.next_in += ret; | |
265 | strm.avail_in -= ret; | |
266 | ||
267 | strm.next_out = dst; | |
268 | strm.avail_out = len; | |
269 | strm.total_out = 0; | |
270 | ||
271 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
272 | DBG_FLT("binfmt_flat: zlib init failed?\n"); | |
273 | goto out_free_buf; | |
274 | } | |
275 | ||
276 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
3dc20cb2 | 277 | ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE); |
1da177e4 LT |
278 | if (ret <= 0) |
279 | break; | |
1da177e4 LT |
280 | len -= ret; |
281 | ||
282 | strm.next_in = buf; | |
283 | strm.avail_in = ret; | |
284 | strm.total_in = 0; | |
3dc20cb2 | 285 | fpos += ret; |
1da177e4 LT |
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) { | |
13c3f50c NP |
326 | printk("BINFMT_FLAT: reference 0x%lx to shared library %d", |
327 | r, id); | |
1da177e4 LT |
328 | goto failed; |
329 | } | |
330 | if (curid != id) { | |
331 | if (internalp) { | |
13c3f50c NP |
332 | printk("BINFMT_FLAT: reloc address 0x%lx not in same module " |
333 | "(%d != %d)", r, curid, id); | |
1da177e4 | 334 | goto failed; |
13c3f50c NP |
335 | } else if (!p->lib_list[id].loaded && |
336 | load_flat_shared_library(id, p) < 0) { | |
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)) { | |
13c3f50c NP |
357 | printk("BINFMT_FLAT: reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
358 | r, start_brk-start_data+text_len, text_len); | |
1da177e4 LT |
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...*/ | |
13c3f50c | 368 | return addr; |
1da177e4 LT |
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 | ||
34303435 | 379 | static void old_reloc(unsigned long rl) |
1da177e4 LT |
380 | { |
381 | #ifdef DEBUG | |
13c3f50c | 382 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
1da177e4 LT |
383 | #endif |
384 | flat_v2_reloc_t r; | |
385 | unsigned long *ptr; | |
13c3f50c | 386 | |
1da177e4 LT |
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 " | |
13c3f50c NP |
396 | "(address %p, currently %lx) into segment %s\n", |
397 | r.reloc.offset, ptr, *ptr, segment[r.reloc.type]); | |
1da177e4 | 398 | #endif |
13c3f50c | 399 | |
1da177e4 LT |
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 | |
13c3f50c | 416 | printk("Relocation became %lx\n", *ptr); |
1da177e4 | 417 | #endif |
13c3f50c | 418 | } |
1da177e4 LT |
419 | |
420 | /****************************************************************************/ | |
421 | ||
13c3f50c | 422 | static int load_flat_file(struct linux_binprm *bprm, |
1da177e4 LT |
423 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
424 | { | |
13c3f50c NP |
425 | struct flat_hdr *hdr; |
426 | unsigned long textpos, datapos, realdatastart; | |
427 | unsigned long text_len, data_len, bss_len, stack_len, full_data, flags; | |
428 | unsigned long len, memp, memp_size, extra, rlim; | |
429 | unsigned long *reloc, *rp; | |
1da177e4 | 430 | struct inode *inode; |
13c3f50c | 431 | int i, rev, relocs; |
1da177e4 LT |
432 | loff_t fpos; |
433 | unsigned long start_code, end_code; | |
13c3f50c | 434 | ssize_t result; |
1ad3dcc0 | 435 | int ret; |
1da177e4 LT |
436 | |
437 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
496ad9aa | 438 | inode = file_inode(bprm->file); |
1da177e4 LT |
439 | |
440 | text_len = ntohl(hdr->data_start); | |
441 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
442 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
443 | stack_len = ntohl(hdr->stack_size); | |
444 | if (extra_stack) { | |
445 | stack_len += *extra_stack; | |
446 | *extra_stack = stack_len; | |
447 | } | |
448 | relocs = ntohl(hdr->reloc_count); | |
449 | flags = ntohl(hdr->flags); | |
450 | rev = ntohl(hdr->rev); | |
3dc20cb2 | 451 | full_data = data_len + relocs * sizeof(unsigned long); |
1da177e4 | 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 | 474 | } |
13c3f50c | 475 | |
1da177e4 LT |
476 | /* Don't allow old format executables to use shared libraries */ |
477 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
13c3f50c NP |
478 | printk("BINFMT_FLAT: shared libraries are not available before rev 0x%lx\n", |
479 | 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) { | |
13c3f50c NP |
514 | ret = flush_old_exec(bprm); |
515 | if (ret) | |
df88912a | 516 | goto err; |
1da177e4 LT |
517 | |
518 | /* OK, This is the point of no return */ | |
fcc18e83 | 519 | set_personality(PER_LINUX_32BIT); |
221af7f8 | 520 | setup_new_exec(bprm); |
1da177e4 LT |
521 | } |
522 | ||
523 | /* | |
524 | * calculate the extra space we need to map in | |
525 | */ | |
0e647c04 AM |
526 | extra = max_t(unsigned long, bss_len + stack_len, |
527 | relocs * sizeof(unsigned long)); | |
1da177e4 LT |
528 | |
529 | /* | |
530 | * there are a couple of cases here, the separate code/data | |
531 | * case, and then the fully copied to RAM case which lumps | |
532 | * it all together. | |
533 | */ | |
534 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { | |
535 | /* | |
536 | * this should give us a ROM ptr, but if it doesn't we don't | |
537 | * really care | |
538 | */ | |
539 | DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); | |
540 | ||
6be5ceb0 | 541 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
925d1c40 | 542 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
0b8c78f2 | 543 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 544 | ret = textpos; |
13c3f50c NP |
545 | if (!textpos) |
546 | ret = -ENOMEM; | |
547 | printk("Unable to mmap process text, errno %d\n", ret); | |
df88912a | 548 | goto err; |
1da177e4 LT |
549 | } |
550 | ||
72613e5f | 551 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
0f3e442a | 552 | len = PAGE_ALIGN(len); |
13c3f50c | 553 | realdatastart = vm_mmap(NULL, 0, len, |
72613e5f | 554 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 | 555 | |
0b8c78f2 | 556 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
13c3f50c | 557 | ret = realdatastart; |
1da177e4 | 558 | if (!realdatastart) |
13c3f50c NP |
559 | ret = -ENOMEM; |
560 | printk("Unable to allocate RAM for process data, " | |
561 | "errno %d\n", ret); | |
7696e0c3 | 562 | vm_munmap(textpos, text_len); |
df88912a | 563 | goto err; |
1da177e4 | 564 | } |
c3dc5bec OS |
565 | datapos = ALIGN(realdatastart + |
566 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
567 | FLAT_DATA_ALIGN); | |
1da177e4 | 568 | |
13c3f50c NP |
569 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%ld bytes): %lx\n", |
570 | data_len + bss_len + stack_len, datapos); | |
1da177e4 LT |
571 | |
572 | fpos = ntohl(hdr->data_start); | |
573 | #ifdef CONFIG_BINFMT_ZFLAT | |
574 | if (flags & FLAT_FLAG_GZDATA) { | |
13c3f50c | 575 | result = decompress_exec(bprm, fpos, (char *)datapos, |
3dc20cb2 | 576 | full_data, 0); |
1da177e4 LT |
577 | } else |
578 | #endif | |
579 | { | |
3dc20cb2 AV |
580 | result = read_code(bprm->file, datapos, fpos, |
581 | full_data); | |
1da177e4 | 582 | } |
0b8c78f2 | 583 | if (IS_ERR_VALUE(result)) { |
13c3f50c NP |
584 | ret = result; |
585 | printk("Unable to read data+bss, errno %d\n", ret); | |
7696e0c3 AV |
586 | vm_munmap(textpos, text_len); |
587 | vm_munmap(realdatastart, len); | |
df88912a | 588 | goto err; |
1da177e4 LT |
589 | } |
590 | ||
13c3f50c NP |
591 | reloc = (unsigned long *) |
592 | (datapos + (ntohl(hdr->reloc_start) - text_len)); | |
1da177e4 | 593 | memp = realdatastart; |
0f3e442a | 594 | memp_size = len; |
1da177e4 LT |
595 | } else { |
596 | ||
72613e5f | 597 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
0f3e442a | 598 | len = PAGE_ALIGN(len); |
13c3f50c | 599 | textpos = vm_mmap(NULL, 0, len, |
72613e5f | 600 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
72613e5f | 601 | |
0b8c78f2 | 602 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 603 | ret = textpos; |
13c3f50c NP |
604 | if (!textpos) |
605 | ret = -ENOMEM; | |
606 | printk("Unable to allocate RAM for process text/data, " | |
607 | "errno %d\n", ret); | |
df88912a | 608 | goto err; |
1da177e4 LT |
609 | } |
610 | ||
611 | realdatastart = textpos + ntohl(hdr->data_start); | |
c3dc5bec OS |
612 | datapos = ALIGN(realdatastart + |
613 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
614 | FLAT_DATA_ALIGN); | |
615 | ||
616 | reloc = (unsigned long *) | |
617 | (datapos + (ntohl(hdr->reloc_start) - text_len)); | |
1da177e4 | 618 | memp = textpos; |
0f3e442a | 619 | memp_size = len; |
1da177e4 LT |
620 | #ifdef CONFIG_BINFMT_ZFLAT |
621 | /* | |
622 | * load it all in and treat it like a RAM load from now on | |
623 | */ | |
624 | if (flags & FLAT_FLAG_GZIP) { | |
13c3f50c NP |
625 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
626 | (((char *)textpos) + sizeof(struct flat_hdr)), | |
3dc20cb2 | 627 | (text_len + full_data |
13c3f50c | 628 | - sizeof(struct flat_hdr)), |
1da177e4 LT |
629 | 0); |
630 | memmove((void *) datapos, (void *) realdatastart, | |
3dc20cb2 | 631 | full_data); |
1da177e4 | 632 | } else if (flags & FLAT_FLAG_GZDATA) { |
3dc20cb2 | 633 | result = read_code(bprm->file, textpos, 0, text_len); |
0b8c78f2 | 634 | if (!IS_ERR_VALUE(result)) |
1da177e4 | 635 | result = decompress_exec(bprm, text_len, (char *) datapos, |
3dc20cb2 | 636 | full_data, 0); |
13c3f50c | 637 | } else |
1da177e4 LT |
638 | #endif |
639 | { | |
3dc20cb2 AV |
640 | result = read_code(bprm->file, textpos, 0, text_len); |
641 | if (!IS_ERR_VALUE(result)) | |
642 | result = read_code(bprm->file, datapos, | |
643 | ntohl(hdr->data_start), | |
644 | full_data); | |
1da177e4 | 645 | } |
0b8c78f2 | 646 | if (IS_ERR_VALUE(result)) { |
13c3f50c NP |
647 | ret = result; |
648 | printk("Unable to read code+data+bss, errno %d\n", ret); | |
7696e0c3 | 649 | vm_munmap(textpos, text_len + data_len + extra + |
1da177e4 | 650 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
df88912a | 651 | goto err; |
1da177e4 LT |
652 | } |
653 | } | |
654 | ||
13c3f50c NP |
655 | start_code = textpos + sizeof(struct flat_hdr); |
656 | end_code = textpos + text_len; | |
657 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
1da177e4 LT |
658 | |
659 | /* The main program needs a little extra setup in the task structure */ | |
1da177e4 LT |
660 | if (id == 0) { |
661 | current->mm->start_code = start_code; | |
662 | current->mm->end_code = end_code; | |
663 | current->mm->start_data = datapos; | |
664 | current->mm->end_data = datapos + data_len; | |
665 | /* | |
666 | * set up the brk stuff, uses any slack left in data/bss/stack | |
667 | * allocation. We put the brk after the bss (between the bss | |
668 | * and stack) like other platforms. | |
0f3e442a DH |
669 | * Userspace code relies on the stack pointer starting out at |
670 | * an address right at the end of a page. | |
1da177e4 LT |
671 | */ |
672 | current->mm->start_brk = datapos + data_len + bss_len; | |
673 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
0f3e442a | 674 | current->mm->context.end_brk = memp + memp_size - stack_len; |
1da177e4 LT |
675 | } |
676 | ||
13c3f50c NP |
677 | if (flags & FLAT_FLAG_KTRACE) { |
678 | printk("Mapping is %lx, Entry point is %x, data_start is %x\n", | |
679 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); | |
680 | printk("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", | |
681 | id ? "Lib" : "Load", bprm->filename, | |
682 | start_code, end_code, datapos, datapos + data_len, | |
683 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); | |
684 | } | |
1da177e4 LT |
685 | |
686 | /* Store the current module values into the global library structure */ | |
687 | libinfo->lib_list[id].start_code = start_code; | |
688 | libinfo->lib_list[id].start_data = datapos; | |
689 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; | |
690 | libinfo->lib_list[id].text_len = text_len; | |
691 | libinfo->lib_list[id].loaded = 1; | |
692 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
693 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); | |
13c3f50c | 694 | |
1da177e4 LT |
695 | /* |
696 | * We just load the allocations into some temporary memory to | |
697 | * help simplify all this mumbo jumbo | |
698 | * | |
699 | * We've got two different sections of relocation entries. | |
25985edc | 700 | * The first is the GOT which resides at the beginning of the data segment |
1da177e4 LT |
701 | * and is terminated with a -1. This one can be relocated in place. |
702 | * The second is the extra relocation entries tacked after the image's | |
703 | * data segment. These require a little more processing as the entry is | |
704 | * really an offset into the image which contains an offset into the | |
705 | * image. | |
706 | */ | |
707 | if (flags & FLAT_FLAG_GOTPIC) { | |
708 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { | |
709 | unsigned long addr; | |
710 | if (*rp) { | |
711 | addr = calc_reloc(*rp, libinfo, id, 0); | |
1ad3dcc0 LY |
712 | if (addr == RELOC_FAILED) { |
713 | ret = -ENOEXEC; | |
df88912a | 714 | goto err; |
1ad3dcc0 | 715 | } |
1da177e4 LT |
716 | *rp = addr; |
717 | } | |
718 | } | |
719 | } | |
720 | ||
721 | /* | |
722 | * Now run through the relocation entries. | |
723 | * We've got to be careful here as C++ produces relocatable zero | |
724 | * entries in the constructor and destructor tables which are then | |
725 | * tested for being not zero (which will always occur unless we're | |
726 | * based from address zero). This causes an endless loop as __start | |
727 | * is at zero. The solution used is to not relocate zero addresses. | |
728 | * This has the negative side effect of not allowing a global data | |
729 | * reference to be statically initialised to _stext (I've moved | |
730 | * __start to address 4 so that is okay). | |
731 | */ | |
732 | if (rev > OLD_FLAT_VERSION) { | |
f9720205 | 733 | unsigned long persistent = 0; |
13c3f50c | 734 | for (i = 0; i < relocs; i++) { |
1da177e4 LT |
735 | unsigned long addr, relval; |
736 | ||
13c3f50c NP |
737 | /* |
738 | * Get the address of the pointer to be | |
739 | * relocated (of course, the address has to be | |
740 | * relocated first). | |
741 | */ | |
1da177e4 | 742 | relval = ntohl(reloc[i]); |
13c3f50c | 743 | if (flat_set_persistent(relval, &persistent)) |
f9720205 | 744 | continue; |
1da177e4 LT |
745 | addr = flat_get_relocate_addr(relval); |
746 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); | |
1ad3dcc0 LY |
747 | if (rp == (unsigned long *)RELOC_FAILED) { |
748 | ret = -ENOEXEC; | |
df88912a | 749 | goto err; |
1ad3dcc0 | 750 | } |
1da177e4 LT |
751 | |
752 | /* Get the pointer's value. */ | |
576bb9ce AM |
753 | addr = flat_get_addr_from_rp(rp, relval, flags, |
754 | &persistent); | |
1da177e4 LT |
755 | if (addr != 0) { |
756 | /* | |
757 | * Do the relocation. PIC relocs in the data section are | |
758 | * already in target order | |
759 | */ | |
760 | if ((flags & FLAT_FLAG_GOTPIC) == 0) | |
761 | addr = ntohl(addr); | |
762 | addr = calc_reloc(addr, libinfo, id, 0); | |
1ad3dcc0 LY |
763 | if (addr == RELOC_FAILED) { |
764 | ret = -ENOEXEC; | |
df88912a | 765 | goto err; |
1ad3dcc0 | 766 | } |
1da177e4 LT |
767 | |
768 | /* Write back the relocated pointer. */ | |
769 | flat_put_addr_at_rp(rp, addr, relval); | |
770 | } | |
771 | } | |
772 | } else { | |
13c3f50c | 773 | for (i = 0; i < relocs; i++) |
1da177e4 LT |
774 | old_reloc(ntohl(reloc[i])); |
775 | } | |
13c3f50c | 776 | |
1da177e4 LT |
777 | flush_icache_range(start_code, end_code); |
778 | ||
779 | /* zero the BSS, BRK and stack areas */ | |
13c3f50c | 780 | memset((void *)(datapos + data_len), 0, bss_len + |
0f3e442a DH |
781 | (memp + memp_size - stack_len - /* end brk */ |
782 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
1da177e4 LT |
783 | stack_len); |
784 | ||
785 | return 0; | |
1ad3dcc0 LY |
786 | err: |
787 | return ret; | |
1da177e4 LT |
788 | } |
789 | ||
790 | ||
791 | /****************************************************************************/ | |
792 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
793 | ||
794 | /* | |
795 | * Load a shared library into memory. The library gets its own data | |
796 | * segment (including bss) but not argv/argc/environ. | |
797 | */ | |
798 | ||
799 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
800 | { | |
801 | struct linux_binprm bprm; | |
802 | int res; | |
803 | char buf[16]; | |
804 | ||
3a852d3b DH |
805 | memset(&bprm, 0, sizeof(bprm)); |
806 | ||
1da177e4 LT |
807 | /* Create the file name */ |
808 | sprintf(buf, "/lib/lib%d.so", id); | |
809 | ||
810 | /* Open the file up */ | |
811 | bprm.filename = buf; | |
812 | bprm.file = open_exec(bprm.filename); | |
813 | res = PTR_ERR(bprm.file); | |
814 | if (IS_ERR(bprm.file)) | |
815 | return res; | |
816 | ||
3440625d LT |
817 | bprm.cred = prepare_exec_creds(); |
818 | res = -ENOMEM; | |
819 | if (!bprm.cred) | |
820 | goto out; | |
821 | ||
3a852d3b DH |
822 | /* We don't really care about recalculating credentials at this point |
823 | * as we're past the point of no return and are dealing with shared | |
824 | * libraries. | |
825 | */ | |
826 | bprm.cred_prepared = 1; | |
827 | ||
1da177e4 LT |
828 | res = prepare_binprm(&bprm); |
829 | ||
287980e4 | 830 | if (!res) |
1da177e4 | 831 | res = load_flat_file(&bprm, libs, id, NULL); |
3440625d LT |
832 | |
833 | abort_creds(bprm.cred); | |
834 | ||
835 | out: | |
836 | allow_write_access(bprm.file); | |
837 | fput(bprm.file); | |
838 | ||
13c3f50c | 839 | return res; |
1da177e4 LT |
840 | } |
841 | ||
842 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
843 | /****************************************************************************/ | |
844 | ||
845 | /* | |
846 | * These are the functions used to load flat style executables and shared | |
847 | * libraries. There is no binary dependent code anywhere else. | |
848 | */ | |
849 | ||
13c3f50c | 850 | static int load_flat_binary(struct linux_binprm *bprm) |
1da177e4 LT |
851 | { |
852 | struct lib_info libinfo; | |
71613c3b | 853 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
854 | unsigned long p = bprm->p; |
855 | unsigned long stack_len; | |
856 | unsigned long start_addr; | |
857 | unsigned long *sp; | |
858 | int res; | |
859 | int i, j; | |
860 | ||
861 | memset(&libinfo, 0, sizeof(libinfo)); | |
13c3f50c | 862 | |
1da177e4 LT |
863 | /* |
864 | * We have to add the size of our arguments to our stack size | |
865 | * otherwise it's too easy for users to create stack overflows | |
866 | * by passing in a huge argument list. And yes, we have to be | |
867 | * pedantic and include space for the argv/envp array as it may have | |
868 | * a lot of entries. | |
869 | */ | |
870 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) | |
871 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ | |
872 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ | |
873 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ | |
2e94de8a | 874 | stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */ |
13c3f50c | 875 | |
1da177e4 | 876 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
287980e4 | 877 | if (res < 0) |
1da177e4 | 878 | return res; |
13c3f50c | 879 | |
1da177e4 | 880 | /* Update data segment pointers for all libraries */ |
13c3f50c | 881 | for (i = 0; i < MAX_SHARED_LIBS; i++) |
1da177e4 | 882 | if (libinfo.lib_list[i].loaded) |
13c3f50c | 883 | for (j = 0; j < MAX_SHARED_LIBS; j++) |
1da177e4 | 884 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = |
13c3f50c NP |
885 | (libinfo.lib_list[j].loaded) ? |
886 | libinfo.lib_list[j].start_data : UNLOADED_LIB; | |
1da177e4 | 887 | |
a6f76f23 | 888 | install_exec_creds(bprm); |
1da177e4 LT |
889 | |
890 | set_binfmt(&flat_format); | |
891 | ||
892 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; | |
13c3f50c | 893 | DBG_FLT("p=%lx\n", p); |
1da177e4 LT |
894 | |
895 | /* copy the arg pages onto the stack, this could be more efficient :-) */ | |
896 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) | |
13c3f50c | 897 | *(char *) --p = |
1da177e4 LT |
898 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; |
899 | ||
900 | sp = (unsigned long *) create_flat_tables(p, bprm); | |
13c3f50c | 901 | |
1da177e4 LT |
902 | /* Fake some return addresses to ensure the call chain will |
903 | * initialise library in order for us. We are required to call | |
904 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
905 | */ | |
906 | start_addr = libinfo.lib_list[0].entry; | |
907 | ||
908 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
13c3f50c | 909 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
1da177e4 LT |
910 | if (libinfo.lib_list[i].loaded) { |
911 | /* Push previos first to call address */ | |
912 | --sp; put_user(start_addr, sp); | |
913 | start_addr = libinfo.lib_list[i].entry; | |
914 | } | |
915 | } | |
916 | #endif | |
13c3f50c | 917 | |
1da177e4 | 918 | /* Stash our initial stack pointer into the mm structure */ |
13c3f50c | 919 | current->mm->start_stack = (unsigned long)sp; |
1da177e4 | 920 | |
74c27c43 TY |
921 | #ifdef FLAT_PLAT_INIT |
922 | FLAT_PLAT_INIT(regs); | |
923 | #endif | |
13c3f50c NP |
924 | |
925 | DBG_FLT("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", | |
926 | regs, start_addr, current->mm->start_stack); | |
1da177e4 LT |
927 | start_thread(regs, start_addr, current->mm->start_stack); |
928 | ||
1da177e4 LT |
929 | return 0; |
930 | } | |
931 | ||
932 | /****************************************************************************/ | |
933 | ||
934 | static int __init init_flat_binfmt(void) | |
935 | { | |
8fc3dc5a AV |
936 | register_binfmt(&flat_format); |
937 | return 0; | |
1da177e4 | 938 | } |
1da177e4 | 939 | core_initcall(init_flat_binfmt); |
1da177e4 LT |
940 | |
941 | /****************************************************************************/ |