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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /****************************************************************************/ |
3 | /* | |
4 | * linux/fs/binfmt_flat.c | |
5 | * | |
6 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> | |
7 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
8 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> | |
9 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> | |
10 | * based heavily on: | |
11 | * | |
12 | * linux/fs/binfmt_aout.c: | |
13 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
14 | * linux/fs/binfmt_flat.c for 2.0 kernel | |
15 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
16 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) | |
17 | */ | |
18 | ||
4adbb6ac NP |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
1da177e4 LT |
21 | #include <linux/kernel.h> |
22 | #include <linux/sched.h> | |
68db0cf1 | 23 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
24 | #include <linux/mm.h> |
25 | #include <linux/mman.h> | |
1da177e4 LT |
26 | #include <linux/errno.h> |
27 | #include <linux/signal.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/file.h> | |
1da177e4 LT |
31 | #include <linux/ptrace.h> |
32 | #include <linux/user.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/binfmts.h> | |
35 | #include <linux/personality.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/flat.h> | |
13c3f50c | 38 | #include <linux/uaccess.h> |
472f95f3 | 39 | #include <linux/vmalloc.h> |
1da177e4 LT |
40 | |
41 | #include <asm/byteorder.h> | |
1da177e4 LT |
42 | #include <asm/unaligned.h> |
43 | #include <asm/cacheflush.h> | |
c3dc5bec | 44 | #include <asm/page.h> |
06d2bfed | 45 | #include <asm/flat.h> |
1da177e4 | 46 | |
02da2833 CH |
47 | #ifndef flat_get_relocate_addr |
48 | #define flat_get_relocate_addr(rel) (rel) | |
49 | #endif | |
1da177e4 LT |
50 | |
51 | /****************************************************************************/ | |
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 | ||
a445d988 CH |
71 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
72 | #define MAX_SHARED_LIBS (4) | |
73 | #else | |
74 | #define MAX_SHARED_LIBS (1) | |
75 | #endif | |
76 | ||
04d82a6d DLM |
77 | #ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET |
78 | #define DATA_START_OFFSET_WORDS (0) | |
79 | #else | |
80 | #define DATA_START_OFFSET_WORDS (MAX_SHARED_LIBS) | |
81 | #endif | |
82 | ||
1da177e4 LT |
83 | struct lib_info { |
84 | struct { | |
85 | unsigned long start_code; /* Start of text segment */ | |
86 | unsigned long start_data; /* Start of data segment */ | |
87 | unsigned long start_brk; /* End of data segment */ | |
88 | unsigned long text_len; /* Length of text segment */ | |
89 | unsigned long entry; /* Start address for this module */ | |
90 | unsigned long build_date; /* When this one was compiled */ | |
13c3f50c | 91 | bool loaded; /* Has this library been loaded? */ |
1da177e4 LT |
92 | } lib_list[MAX_SHARED_LIBS]; |
93 | }; | |
94 | ||
95 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
96 | static int load_flat_shared_library(int id, struct lib_info *p); | |
97 | #endif | |
98 | ||
71613c3b | 99 | static int load_flat_binary(struct linux_binprm *); |
1da177e4 | 100 | |
1da177e4 LT |
101 | static struct linux_binfmt flat_format = { |
102 | .module = THIS_MODULE, | |
103 | .load_binary = load_flat_binary, | |
1da177e4 LT |
104 | }; |
105 | ||
1da177e4 LT |
106 | |
107 | /****************************************************************************/ | |
108 | /* | |
109 | * create_flat_tables() parses the env- and arg-strings in new user | |
110 | * memory and creates the pointer tables from them, and puts their | |
a97d157d | 111 | * addresses on the "stack", recording the new stack pointer value. |
1da177e4 LT |
112 | */ |
113 | ||
a97d157d | 114 | static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start) |
1da177e4 | 115 | { |
a97d157d NP |
116 | char __user *p; |
117 | unsigned long __user *sp; | |
118 | long i, len; | |
1da177e4 | 119 | |
a97d157d NP |
120 | p = (char __user *)arg_start; |
121 | sp = (unsigned long __user *)current->mm->start_stack; | |
122 | ||
123 | sp -= bprm->envc + 1; | |
124 | sp -= bprm->argc + 1; | |
bdd15a28 CH |
125 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) |
126 | sp -= 2; /* argvp + envp */ | |
a97d157d NP |
127 | sp -= 1; /* &argc */ |
128 | ||
129 | current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; | |
130 | sp = (unsigned long __user *)current->mm->start_stack; | |
131 | ||
8861fd57 AV |
132 | if (put_user(bprm->argc, sp++)) |
133 | return -EFAULT; | |
bdd15a28 | 134 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { |
a97d157d NP |
135 | unsigned long argv, envp; |
136 | argv = (unsigned long)(sp + 2); | |
137 | envp = (unsigned long)(sp + 2 + bprm->argc + 1); | |
8861fd57 AV |
138 | if (put_user(argv, sp++) || put_user(envp, sp++)) |
139 | return -EFAULT; | |
a97d157d NP |
140 | } |
141 | ||
142 | current->mm->arg_start = (unsigned long)p; | |
143 | for (i = bprm->argc; i > 0; i--) { | |
8861fd57 AV |
144 | if (put_user((unsigned long)p, sp++)) |
145 | return -EFAULT; | |
a97d157d NP |
146 | len = strnlen_user(p, MAX_ARG_STRLEN); |
147 | if (!len || len > MAX_ARG_STRLEN) | |
148 | return -EINVAL; | |
149 | p += len; | |
150 | } | |
8861fd57 AV |
151 | if (put_user(0, sp++)) |
152 | return -EFAULT; | |
a97d157d NP |
153 | current->mm->arg_end = (unsigned long)p; |
154 | ||
155 | current->mm->env_start = (unsigned long) p; | |
156 | for (i = bprm->envc; i > 0; i--) { | |
8861fd57 AV |
157 | if (put_user((unsigned long)p, sp++)) |
158 | return -EFAULT; | |
a97d157d NP |
159 | len = strnlen_user(p, MAX_ARG_STRLEN); |
160 | if (!len || len > MAX_ARG_STRLEN) | |
161 | return -EINVAL; | |
162 | p += len; | |
163 | } | |
8861fd57 AV |
164 | if (put_user(0, sp++)) |
165 | return -EFAULT; | |
a97d157d NP |
166 | current->mm->env_end = (unsigned long)p; |
167 | ||
168 | return 0; | |
1da177e4 LT |
169 | } |
170 | ||
171 | /****************************************************************************/ | |
172 | ||
173 | #ifdef CONFIG_BINFMT_ZFLAT | |
174 | ||
175 | #include <linux/zlib.h> | |
176 | ||
177 | #define LBUFSIZE 4000 | |
178 | ||
179 | /* gzip flag byte */ | |
180 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
181 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
182 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
183 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
184 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
185 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
186 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
187 | ||
bdd1d2d3 CH |
188 | static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst, |
189 | long len, int fd) | |
1da177e4 LT |
190 | { |
191 | unsigned char *buf; | |
192 | z_stream strm; | |
1da177e4 LT |
193 | int ret, retval; |
194 | ||
bdd1d2d3 | 195 | pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len); |
1da177e4 LT |
196 | |
197 | memset(&strm, 0, sizeof(strm)); | |
198 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
9367bb73 | 199 | if (!strm.workspace) |
1da177e4 | 200 | return -ENOMEM; |
9367bb73 | 201 | |
1da177e4 | 202 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
9367bb73 | 203 | if (!buf) { |
1da177e4 LT |
204 | retval = -ENOMEM; |
205 | goto out_free; | |
206 | } | |
207 | ||
208 | /* Read in first chunk of data and parse gzip header. */ | |
bdd1d2d3 | 209 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
210 | |
211 | strm.next_in = buf; | |
212 | strm.avail_in = ret; | |
213 | strm.total_in = 0; | |
214 | ||
215 | retval = -ENOEXEC; | |
216 | ||
217 | /* Check minimum size -- gzip header */ | |
218 | if (ret < 10) { | |
4adbb6ac | 219 | pr_debug("file too small?\n"); |
1da177e4 LT |
220 | goto out_free_buf; |
221 | } | |
222 | ||
223 | /* Check gzip magic number */ | |
224 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
4adbb6ac | 225 | pr_debug("unknown compression magic?\n"); |
1da177e4 LT |
226 | goto out_free_buf; |
227 | } | |
228 | ||
229 | /* Check gzip method */ | |
230 | if (buf[2] != 8) { | |
4adbb6ac | 231 | pr_debug("unknown compression method?\n"); |
1da177e4 LT |
232 | goto out_free_buf; |
233 | } | |
234 | /* Check gzip flags */ | |
235 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
236 | (buf[3] & RESERVED)) { | |
4adbb6ac | 237 | pr_debug("unknown flags?\n"); |
1da177e4 LT |
238 | goto out_free_buf; |
239 | } | |
240 | ||
241 | ret = 10; | |
242 | if (buf[3] & EXTRA_FIELD) { | |
243 | ret += 2 + buf[10] + (buf[11] << 8); | |
13c3f50c | 244 | if (unlikely(ret >= LBUFSIZE)) { |
4adbb6ac | 245 | pr_debug("buffer overflow (EXTRA)?\n"); |
1da177e4 LT |
246 | goto out_free_buf; |
247 | } | |
248 | } | |
249 | if (buf[3] & ORIG_NAME) { | |
f4cfb18d | 250 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 251 | ; |
13c3f50c | 252 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 253 | pr_debug("buffer overflow (ORIG_NAME)?\n"); |
1da177e4 LT |
254 | goto out_free_buf; |
255 | } | |
256 | } | |
257 | if (buf[3] & COMMENT) { | |
f4cfb18d | 258 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 259 | ; |
13c3f50c | 260 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 261 | pr_debug("buffer overflow (COMMENT)?\n"); |
1da177e4 LT |
262 | goto out_free_buf; |
263 | } | |
264 | } | |
265 | ||
266 | strm.next_in += ret; | |
267 | strm.avail_in -= ret; | |
268 | ||
269 | strm.next_out = dst; | |
270 | strm.avail_out = len; | |
271 | strm.total_out = 0; | |
272 | ||
273 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
4adbb6ac | 274 | pr_debug("zlib init failed?\n"); |
1da177e4 LT |
275 | goto out_free_buf; |
276 | } | |
277 | ||
278 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
bdd1d2d3 | 279 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
280 | if (ret <= 0) |
281 | break; | |
1da177e4 LT |
282 | len -= ret; |
283 | ||
284 | strm.next_in = buf; | |
285 | strm.avail_in = ret; | |
286 | strm.total_in = 0; | |
287 | } | |
288 | ||
289 | if (ret < 0) { | |
4adbb6ac | 290 | pr_debug("decompression failed (%d), %s\n", |
1da177e4 LT |
291 | ret, strm.msg); |
292 | goto out_zlib; | |
293 | } | |
294 | ||
295 | retval = 0; | |
296 | out_zlib: | |
297 | zlib_inflateEnd(&strm); | |
298 | out_free_buf: | |
299 | kfree(buf); | |
300 | out_free: | |
301 | kfree(strm.workspace); | |
1da177e4 LT |
302 | return retval; |
303 | } | |
304 | ||
305 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
306 | ||
307 | /****************************************************************************/ | |
308 | ||
309 | static unsigned long | |
310 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) | |
311 | { | |
312 | unsigned long addr; | |
313 | int id; | |
314 | unsigned long start_brk; | |
315 | unsigned long start_data; | |
316 | unsigned long text_len; | |
317 | unsigned long start_code; | |
318 | ||
319 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
320 | if (r == 0) | |
321 | id = curid; /* Relocs of 0 are always self referring */ | |
322 | else { | |
323 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
324 | r &= 0x00ffffff; /* Trim ID off here */ | |
325 | } | |
326 | if (id >= MAX_SHARED_LIBS) { | |
4adbb6ac | 327 | pr_err("reference 0x%lx to shared library %d", r, id); |
1da177e4 LT |
328 | goto failed; |
329 | } | |
330 | if (curid != id) { | |
331 | if (internalp) { | |
4adbb6ac NP |
332 | pr_err("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) { | |
4adbb6ac | 337 | pr_err("failed to load library %d", id); |
1da177e4 LT |
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) { | |
4adbb6ac | 343 | pr_err("library %d is younger than %d", id, curid); |
1da177e4 LT |
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 | ||
9ee24b2a | 356 | if (r > start_brk - start_data + text_len) { |
4adbb6ac | 357 | pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
13c3f50c | 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: | |
4adbb6ac | 371 | pr_cont(", killing %s!\n", current->comm); |
1da177e4 LT |
372 | send_sig(SIGSEGV, current, 0); |
373 | ||
374 | return RELOC_FAILED; | |
375 | } | |
376 | ||
377 | /****************************************************************************/ | |
378 | ||
cf9a566c | 379 | #ifdef CONFIG_BINFMT_FLAT_OLD |
34303435 | 380 | static void old_reloc(unsigned long rl) |
1da177e4 | 381 | { |
13c3f50c | 382 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
1da177e4 | 383 | flat_v2_reloc_t r; |
1b2ce442 NP |
384 | unsigned long __user *ptr; |
385 | unsigned long val; | |
13c3f50c | 386 | |
1da177e4 LT |
387 | r.value = rl; |
388 | #if defined(CONFIG_COLDFIRE) | |
1b2ce442 | 389 | ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset); |
1da177e4 | 390 | #else |
1b2ce442 | 391 | ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset); |
1da177e4 | 392 | #endif |
1b2ce442 | 393 | get_user(val, ptr); |
1da177e4 | 394 | |
4adbb6ac NP |
395 | pr_debug("Relocation of variable at DATASEG+%x " |
396 | "(address %p, currently %lx) into segment %s\n", | |
1b2ce442 | 397 | r.reloc.offset, ptr, val, segment[r.reloc.type]); |
13c3f50c | 398 | |
1da177e4 LT |
399 | switch (r.reloc.type) { |
400 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
1b2ce442 | 401 | val += current->mm->start_code; |
1da177e4 LT |
402 | break; |
403 | case OLD_FLAT_RELOC_TYPE_DATA: | |
1b2ce442 | 404 | val += current->mm->start_data; |
1da177e4 LT |
405 | break; |
406 | case OLD_FLAT_RELOC_TYPE_BSS: | |
1b2ce442 | 407 | val += current->mm->end_data; |
1da177e4 LT |
408 | break; |
409 | default: | |
4adbb6ac | 410 | pr_err("Unknown relocation type=%x\n", r.reloc.type); |
1da177e4 LT |
411 | break; |
412 | } | |
1b2ce442 | 413 | put_user(val, ptr); |
1da177e4 | 414 | |
1b2ce442 | 415 | pr_debug("Relocation became %lx\n", val); |
13c3f50c | 416 | } |
cf9a566c | 417 | #endif /* CONFIG_BINFMT_FLAT_OLD */ |
1da177e4 LT |
418 | |
419 | /****************************************************************************/ | |
420 | ||
6045ab5f NC |
421 | static inline u32 __user *skip_got_header(u32 __user *rp) |
422 | { | |
423 | if (IS_ENABLED(CONFIG_RISCV)) { | |
424 | /* | |
425 | * RISC-V has a 16 byte GOT PLT header for elf64-riscv | |
426 | * and 8 byte GOT PLT header for elf32-riscv. | |
427 | * Skip the whole GOT PLT header, since it is reserved | |
428 | * for the dynamic linker (ld.so). | |
429 | */ | |
430 | u32 rp_val0, rp_val1; | |
431 | ||
432 | if (get_user(rp_val0, rp)) | |
433 | return rp; | |
434 | if (get_user(rp_val1, rp + 1)) | |
435 | return rp; | |
436 | ||
437 | if (rp_val0 == 0xffffffff && rp_val1 == 0xffffffff) | |
438 | rp += 4; | |
439 | else if (rp_val0 == 0xffffffff) | |
440 | rp += 2; | |
441 | } | |
442 | return rp; | |
443 | } | |
444 | ||
13c3f50c | 445 | static int load_flat_file(struct linux_binprm *bprm, |
1da177e4 LT |
446 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
447 | { | |
13c3f50c NP |
448 | struct flat_hdr *hdr; |
449 | unsigned long textpos, datapos, realdatastart; | |
468138d7 | 450 | u32 text_len, data_len, bss_len, stack_len, full_data, flags; |
13c3f50c | 451 | unsigned long len, memp, memp_size, extra, rlim; |
3b977718 CH |
452 | __be32 __user *reloc; |
453 | u32 __user *rp; | |
13c3f50c | 454 | int i, rev, relocs; |
1da177e4 LT |
455 | loff_t fpos; |
456 | unsigned long start_code, end_code; | |
13c3f50c | 457 | ssize_t result; |
1ad3dcc0 | 458 | int ret; |
1da177e4 LT |
459 | |
460 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
1da177e4 LT |
461 | |
462 | text_len = ntohl(hdr->data_start); | |
463 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
464 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
465 | stack_len = ntohl(hdr->stack_size); | |
466 | if (extra_stack) { | |
467 | stack_len += *extra_stack; | |
468 | *extra_stack = stack_len; | |
469 | } | |
470 | relocs = ntohl(hdr->reloc_count); | |
471 | flags = ntohl(hdr->flags); | |
472 | rev = ntohl(hdr->rev); | |
3dc20cb2 | 473 | full_data = data_len + relocs * sizeof(unsigned long); |
1da177e4 | 474 | |
845884d3 | 475 | if (strncmp(hdr->magic, "bFLT", 4)) { |
1da177e4 | 476 | /* |
e2a366dc MF |
477 | * Previously, here was a printk to tell people |
478 | * "BINFMT_FLAT: bad header magic". | |
479 | * But for the kernel which also use ELF FD-PIC format, this | |
480 | * error message is confusing. | |
1da177e4 | 481 | * because a lot of people do not manage to produce good |
1da177e4 | 482 | */ |
1ad3dcc0 LY |
483 | ret = -ENOEXEC; |
484 | goto err; | |
845884d3 GU |
485 | } |
486 | ||
487 | if (flags & FLAT_FLAG_KTRACE) | |
4adbb6ac | 488 | pr_info("Loading file: %s\n", bprm->filename); |
845884d3 | 489 | |
cf9a566c | 490 | #ifdef CONFIG_BINFMT_FLAT_OLD |
845884d3 | 491 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
4adbb6ac NP |
492 | pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
493 | rev, FLAT_VERSION, OLD_FLAT_VERSION); | |
1ad3dcc0 LY |
494 | ret = -ENOEXEC; |
495 | goto err; | |
1da177e4 | 496 | } |
13c3f50c | 497 | |
1da177e4 LT |
498 | /* Don't allow old format executables to use shared libraries */ |
499 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
4adbb6ac NP |
500 | pr_err("shared libraries are not available before rev 0x%lx\n", |
501 | FLAT_VERSION); | |
1ad3dcc0 LY |
502 | ret = -ENOEXEC; |
503 | goto err; | |
1da177e4 LT |
504 | } |
505 | ||
cf9a566c CH |
506 | /* |
507 | * fix up the flags for the older format, there were all kinds | |
508 | * of endian hacks, this only works for the simple cases | |
509 | */ | |
510 | if (rev == OLD_FLAT_VERSION && | |
511 | (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM))) | |
512 | flags = FLAT_FLAG_RAM; | |
513 | ||
514 | #else /* CONFIG_BINFMT_FLAT_OLD */ | |
515 | if (rev != FLAT_VERSION) { | |
516 | pr_err("bad flat file version 0x%x (supported 0x%lx)\n", | |
517 | rev, FLAT_VERSION); | |
518 | ret = -ENOEXEC; | |
519 | goto err; | |
520 | } | |
521 | #endif /* !CONFIG_BINFMT_FLAT_OLD */ | |
522 | ||
c995ee28 NP |
523 | /* |
524 | * Make sure the header params are sane. | |
525 | * 28 bits (256 MB) is way more than reasonable in this case. | |
526 | * If some top bits are set we have probable binary corruption. | |
527 | */ | |
528 | if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) { | |
529 | pr_err("bad header\n"); | |
530 | ret = -ENOEXEC; | |
531 | goto err; | |
532 | } | |
533 | ||
1da177e4 LT |
534 | #ifndef CONFIG_BINFMT_ZFLAT |
535 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
4adbb6ac | 536 | pr_err("Support for ZFLAT executables is not enabled.\n"); |
1ad3dcc0 LY |
537 | ret = -ENOEXEC; |
538 | goto err; | |
1da177e4 LT |
539 | } |
540 | #endif | |
541 | ||
542 | /* | |
543 | * Check initial limits. This avoids letting people circumvent | |
544 | * size limits imposed on them by creating programs with large | |
545 | * arrays in the data or bss. | |
546 | */ | |
d554ed89 | 547 | rlim = rlimit(RLIMIT_DATA); |
1da177e4 LT |
548 | if (rlim >= RLIM_INFINITY) |
549 | rlim = ~0; | |
1ad3dcc0 LY |
550 | if (data_len + bss_len > rlim) { |
551 | ret = -ENOMEM; | |
552 | goto err; | |
553 | } | |
554 | ||
1da177e4 LT |
555 | /* Flush all traces of the currently running executable */ |
556 | if (id == 0) { | |
2388777a | 557 | ret = begin_new_exec(bprm); |
13c3f50c | 558 | if (ret) |
df88912a | 559 | goto err; |
1da177e4 LT |
560 | |
561 | /* OK, This is the point of no return */ | |
fcc18e83 | 562 | set_personality(PER_LINUX_32BIT); |
221af7f8 | 563 | setup_new_exec(bprm); |
1da177e4 LT |
564 | } |
565 | ||
566 | /* | |
567 | * calculate the extra space we need to map in | |
568 | */ | |
0e647c04 AM |
569 | extra = max_t(unsigned long, bss_len + stack_len, |
570 | relocs * sizeof(unsigned long)); | |
1da177e4 LT |
571 | |
572 | /* | |
573 | * there are a couple of cases here, the separate code/data | |
574 | * case, and then the fully copied to RAM case which lumps | |
575 | * it all together. | |
576 | */ | |
015feacf | 577 | if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { |
1da177e4 LT |
578 | /* |
579 | * this should give us a ROM ptr, but if it doesn't we don't | |
580 | * really care | |
581 | */ | |
4adbb6ac | 582 | pr_debug("ROM mapping of file (we hope)\n"); |
1da177e4 | 583 | |
6be5ceb0 | 584 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
a4eec6a3 | 585 | MAP_PRIVATE, 0); |
0b8c78f2 | 586 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 587 | ret = textpos; |
13c3f50c NP |
588 | if (!textpos) |
589 | ret = -ENOMEM; | |
4adbb6ac | 590 | pr_err("Unable to mmap process text, errno %d\n", ret); |
df88912a | 591 | goto err; |
1da177e4 LT |
592 | } |
593 | ||
04d82a6d DLM |
594 | len = data_len + extra + |
595 | DATA_START_OFFSET_WORDS * sizeof(unsigned long); | |
0f3e442a | 596 | len = PAGE_ALIGN(len); |
13c3f50c | 597 | realdatastart = vm_mmap(NULL, 0, len, |
72613e5f | 598 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 | 599 | |
0b8c78f2 | 600 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
13c3f50c | 601 | ret = realdatastart; |
1da177e4 | 602 | if (!realdatastart) |
13c3f50c | 603 | ret = -ENOMEM; |
4adbb6ac | 604 | pr_err("Unable to allocate RAM for process data, " |
13c3f50c | 605 | "errno %d\n", ret); |
7696e0c3 | 606 | vm_munmap(textpos, text_len); |
df88912a | 607 | goto err; |
1da177e4 | 608 | } |
2217b982 | 609 | datapos = ALIGN(realdatastart + |
04d82a6d | 610 | DATA_START_OFFSET_WORDS * sizeof(unsigned long), |
2217b982 | 611 | FLAT_DATA_ALIGN); |
1da177e4 | 612 | |
a8605423 | 613 | pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", |
4adbb6ac | 614 | data_len + bss_len + stack_len, datapos); |
1da177e4 LT |
615 | |
616 | fpos = ntohl(hdr->data_start); | |
617 | #ifdef CONFIG_BINFMT_ZFLAT | |
618 | if (flags & FLAT_FLAG_GZDATA) { | |
13c3f50c | 619 | result = decompress_exec(bprm, fpos, (char *)datapos, |
3dc20cb2 | 620 | full_data, 0); |
1da177e4 LT |
621 | } else |
622 | #endif | |
623 | { | |
3dc20cb2 AV |
624 | result = read_code(bprm->file, datapos, fpos, |
625 | full_data); | |
1da177e4 | 626 | } |
0b8c78f2 | 627 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 628 | ret = result; |
4adbb6ac | 629 | pr_err("Unable to read data+bss, errno %d\n", ret); |
7696e0c3 AV |
630 | vm_munmap(textpos, text_len); |
631 | vm_munmap(realdatastart, len); | |
df88912a | 632 | goto err; |
1da177e4 LT |
633 | } |
634 | ||
3b977718 | 635 | reloc = (__be32 __user *) |
13c3f50c | 636 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 637 | memp = realdatastart; |
0f3e442a | 638 | memp_size = len; |
1da177e4 LT |
639 | } else { |
640 | ||
04d82a6d DLM |
641 | len = text_len + data_len + extra + |
642 | DATA_START_OFFSET_WORDS * sizeof(u32); | |
0f3e442a | 643 | len = PAGE_ALIGN(len); |
13c3f50c | 644 | textpos = vm_mmap(NULL, 0, len, |
72613e5f | 645 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
72613e5f | 646 | |
0b8c78f2 | 647 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 648 | ret = textpos; |
13c3f50c NP |
649 | if (!textpos) |
650 | ret = -ENOMEM; | |
4adbb6ac | 651 | pr_err("Unable to allocate RAM for process text/data, " |
13c3f50c | 652 | "errno %d\n", ret); |
df88912a | 653 | goto err; |
1da177e4 LT |
654 | } |
655 | ||
656 | realdatastart = textpos + ntohl(hdr->data_start); | |
2217b982 | 657 | datapos = ALIGN(realdatastart + |
04d82a6d | 658 | DATA_START_OFFSET_WORDS * sizeof(u32), |
2217b982 | 659 | FLAT_DATA_ALIGN); |
c3dc5bec | 660 | |
3b977718 | 661 | reloc = (__be32 __user *) |
c3dc5bec | 662 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 663 | memp = textpos; |
0f3e442a | 664 | memp_size = len; |
1da177e4 LT |
665 | #ifdef CONFIG_BINFMT_ZFLAT |
666 | /* | |
667 | * load it all in and treat it like a RAM load from now on | |
668 | */ | |
669 | if (flags & FLAT_FLAG_GZIP) { | |
472f95f3 | 670 | #ifndef CONFIG_MMU |
13c3f50c NP |
671 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
672 | (((char *)textpos) + sizeof(struct flat_hdr)), | |
3dc20cb2 | 673 | (text_len + full_data |
13c3f50c | 674 | - sizeof(struct flat_hdr)), |
1da177e4 | 675 | 0); |
2217b982 MF |
676 | memmove((void *) datapos, (void *) realdatastart, |
677 | full_data); | |
472f95f3 NP |
678 | #else |
679 | /* | |
680 | * This is used on MMU systems mainly for testing. | |
681 | * Let's use a kernel buffer to simplify things. | |
682 | */ | |
683 | long unz_text_len = text_len - sizeof(struct flat_hdr); | |
684 | long unz_len = unz_text_len + full_data; | |
685 | char *unz_data = vmalloc(unz_len); | |
686 | if (!unz_data) { | |
687 | result = -ENOMEM; | |
688 | } else { | |
689 | result = decompress_exec(bprm, sizeof(struct flat_hdr), | |
690 | unz_data, unz_len, 0); | |
691 | if (result == 0 && | |
692 | (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), | |
693 | unz_data, unz_text_len) || | |
694 | copy_to_user((void __user *)datapos, | |
695 | unz_data + unz_text_len, full_data))) | |
696 | result = -EFAULT; | |
697 | vfree(unz_data); | |
698 | } | |
699 | #endif | |
1da177e4 | 700 | } else if (flags & FLAT_FLAG_GZDATA) { |
3dc20cb2 | 701 | result = read_code(bprm->file, textpos, 0, text_len); |
472f95f3 NP |
702 | if (!IS_ERR_VALUE(result)) { |
703 | #ifndef CONFIG_MMU | |
1da177e4 | 704 | result = decompress_exec(bprm, text_len, (char *) datapos, |
3dc20cb2 | 705 | full_data, 0); |
472f95f3 NP |
706 | #else |
707 | char *unz_data = vmalloc(full_data); | |
708 | if (!unz_data) { | |
709 | result = -ENOMEM; | |
710 | } else { | |
711 | result = decompress_exec(bprm, text_len, | |
712 | unz_data, full_data, 0); | |
713 | if (result == 0 && | |
714 | copy_to_user((void __user *)datapos, | |
715 | unz_data, full_data)) | |
716 | result = -EFAULT; | |
717 | vfree(unz_data); | |
718 | } | |
1da177e4 | 719 | #endif |
472f95f3 NP |
720 | } |
721 | } else | |
722 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
1da177e4 | 723 | { |
3dc20cb2 AV |
724 | result = read_code(bprm->file, textpos, 0, text_len); |
725 | if (!IS_ERR_VALUE(result)) | |
726 | result = read_code(bprm->file, datapos, | |
727 | ntohl(hdr->data_start), | |
728 | full_data); | |
1da177e4 | 729 | } |
0b8c78f2 | 730 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 731 | ret = result; |
4adbb6ac | 732 | pr_err("Unable to read code+data+bss, errno %d\n", ret); |
2217b982 | 733 | vm_munmap(textpos, text_len + data_len + extra + |
04d82a6d | 734 | DATA_START_OFFSET_WORDS * sizeof(u32)); |
df88912a | 735 | goto err; |
1da177e4 LT |
736 | } |
737 | } | |
738 | ||
13c3f50c NP |
739 | start_code = textpos + sizeof(struct flat_hdr); |
740 | end_code = textpos + text_len; | |
741 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
1da177e4 LT |
742 | |
743 | /* The main program needs a little extra setup in the task structure */ | |
1da177e4 LT |
744 | if (id == 0) { |
745 | current->mm->start_code = start_code; | |
746 | current->mm->end_code = end_code; | |
747 | current->mm->start_data = datapos; | |
748 | current->mm->end_data = datapos + data_len; | |
749 | /* | |
750 | * set up the brk stuff, uses any slack left in data/bss/stack | |
751 | * allocation. We put the brk after the bss (between the bss | |
752 | * and stack) like other platforms. | |
0f3e442a DH |
753 | * Userspace code relies on the stack pointer starting out at |
754 | * an address right at the end of a page. | |
1da177e4 LT |
755 | */ |
756 | current->mm->start_brk = datapos + data_len + bss_len; | |
757 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
015feacf | 758 | #ifndef CONFIG_MMU |
0f3e442a | 759 | current->mm->context.end_brk = memp + memp_size - stack_len; |
015feacf | 760 | #endif |
1da177e4 LT |
761 | } |
762 | ||
13c3f50c | 763 | if (flags & FLAT_FLAG_KTRACE) { |
4adbb6ac NP |
764 | pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
765 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); | |
766 | pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", | |
767 | id ? "Lib" : "Load", bprm->filename, | |
768 | start_code, end_code, datapos, datapos + data_len, | |
769 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); | |
13c3f50c | 770 | } |
1da177e4 LT |
771 | |
772 | /* Store the current module values into the global library structure */ | |
773 | libinfo->lib_list[id].start_code = start_code; | |
774 | libinfo->lib_list[id].start_data = datapos; | |
775 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; | |
776 | libinfo->lib_list[id].text_len = text_len; | |
777 | libinfo->lib_list[id].loaded = 1; | |
778 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
779 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); | |
13c3f50c | 780 | |
1da177e4 LT |
781 | /* |
782 | * We just load the allocations into some temporary memory to | |
783 | * help simplify all this mumbo jumbo | |
784 | * | |
785 | * We've got two different sections of relocation entries. | |
25985edc | 786 | * The first is the GOT which resides at the beginning of the data segment |
1da177e4 LT |
787 | * and is terminated with a -1. This one can be relocated in place. |
788 | * The second is the extra relocation entries tacked after the image's | |
789 | * data segment. These require a little more processing as the entry is | |
790 | * really an offset into the image which contains an offset into the | |
791 | * image. | |
792 | */ | |
793 | if (flags & FLAT_FLAG_GOTPIC) { | |
6045ab5f NC |
794 | rp = skip_got_header((u32 __user *) datapos); |
795 | for (; ; rp++) { | |
468138d7 | 796 | u32 addr, rp_val; |
6e572ffe NP |
797 | if (get_user(rp_val, rp)) |
798 | return -EFAULT; | |
799 | if (rp_val == 0xffffffff) | |
800 | break; | |
801 | if (rp_val) { | |
802 | addr = calc_reloc(rp_val, libinfo, id, 0); | |
1ad3dcc0 LY |
803 | if (addr == RELOC_FAILED) { |
804 | ret = -ENOEXEC; | |
df88912a | 805 | goto err; |
1ad3dcc0 | 806 | } |
6e572ffe NP |
807 | if (put_user(addr, rp)) |
808 | return -EFAULT; | |
1da177e4 LT |
809 | } |
810 | } | |
811 | } | |
812 | ||
813 | /* | |
814 | * Now run through the relocation entries. | |
815 | * We've got to be careful here as C++ produces relocatable zero | |
816 | * entries in the constructor and destructor tables which are then | |
817 | * tested for being not zero (which will always occur unless we're | |
818 | * based from address zero). This causes an endless loop as __start | |
819 | * is at zero. The solution used is to not relocate zero addresses. | |
820 | * This has the negative side effect of not allowing a global data | |
821 | * reference to be statically initialised to _stext (I've moved | |
822 | * __start to address 4 so that is okay). | |
823 | */ | |
824 | if (rev > OLD_FLAT_VERSION) { | |
13c3f50c | 825 | for (i = 0; i < relocs; i++) { |
468138d7 | 826 | u32 addr, relval; |
3b977718 | 827 | __be32 tmp; |
1da177e4 | 828 | |
13c3f50c NP |
829 | /* |
830 | * Get the address of the pointer to be | |
831 | * relocated (of course, the address has to be | |
832 | * relocated first). | |
833 | */ | |
3b977718 | 834 | if (get_user(tmp, reloc + i)) |
6e572ffe | 835 | return -EFAULT; |
3b977718 | 836 | relval = ntohl(tmp); |
1da177e4 | 837 | addr = flat_get_relocate_addr(relval); |
468138d7 AV |
838 | rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1); |
839 | if (rp == (u32 __user *)RELOC_FAILED) { | |
1ad3dcc0 | 840 | ret = -ENOEXEC; |
df88912a | 841 | goto err; |
1ad3dcc0 | 842 | } |
1da177e4 LT |
843 | |
844 | /* Get the pointer's value. */ | |
6843d8aa | 845 | ret = flat_get_addr_from_rp(rp, relval, flags, &addr); |
468138d7 AV |
846 | if (unlikely(ret)) |
847 | goto err; | |
848 | ||
1da177e4 LT |
849 | if (addr != 0) { |
850 | /* | |
851 | * Do the relocation. PIC relocs in the data section are | |
852 | * already in target order | |
853 | */ | |
3b977718 CH |
854 | if ((flags & FLAT_FLAG_GOTPIC) == 0) { |
855 | /* | |
856 | * Meh, the same value can have a different | |
857 | * byte order based on a flag.. | |
858 | */ | |
859 | addr = ntohl((__force __be32)addr); | |
860 | } | |
1da177e4 | 861 | addr = calc_reloc(addr, libinfo, id, 0); |
1ad3dcc0 LY |
862 | if (addr == RELOC_FAILED) { |
863 | ret = -ENOEXEC; | |
df88912a | 864 | goto err; |
1ad3dcc0 | 865 | } |
1da177e4 LT |
866 | |
867 | /* Write back the relocated pointer. */ | |
468138d7 AV |
868 | ret = flat_put_addr_at_rp(rp, addr, relval); |
869 | if (unlikely(ret)) | |
870 | goto err; | |
1da177e4 LT |
871 | } |
872 | } | |
cf9a566c | 873 | #ifdef CONFIG_BINFMT_FLAT_OLD |
1da177e4 | 874 | } else { |
1b2ce442 | 875 | for (i = 0; i < relocs; i++) { |
3b977718 | 876 | __be32 relval; |
1b2ce442 NP |
877 | if (get_user(relval, reloc + i)) |
878 | return -EFAULT; | |
3b977718 | 879 | old_reloc(ntohl(relval)); |
1b2ce442 | 880 | } |
cf9a566c | 881 | #endif /* CONFIG_BINFMT_FLAT_OLD */ |
1da177e4 | 882 | } |
13c3f50c | 883 | |
79ef1e1f | 884 | flush_icache_user_range(start_code, end_code); |
1da177e4 LT |
885 | |
886 | /* zero the BSS, BRK and stack areas */ | |
467aa146 NP |
887 | if (clear_user((void __user *)(datapos + data_len), bss_len + |
888 | (memp + memp_size - stack_len - /* end brk */ | |
889 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
890 | stack_len)) | |
891 | return -EFAULT; | |
1da177e4 LT |
892 | |
893 | return 0; | |
1ad3dcc0 LY |
894 | err: |
895 | return ret; | |
1da177e4 LT |
896 | } |
897 | ||
898 | ||
899 | /****************************************************************************/ | |
900 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
901 | ||
902 | /* | |
903 | * Load a shared library into memory. The library gets its own data | |
904 | * segment (including bss) but not argv/argc/environ. | |
905 | */ | |
906 | ||
907 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
908 | { | |
867bfa4a JH |
909 | /* |
910 | * This is a fake bprm struct; only the members "buf", "file" and | |
911 | * "filename" are actually used. | |
912 | */ | |
1da177e4 LT |
913 | struct linux_binprm bprm; |
914 | int res; | |
915 | char buf[16]; | |
867bfa4a | 916 | loff_t pos = 0; |
1da177e4 | 917 | |
3a852d3b DH |
918 | memset(&bprm, 0, sizeof(bprm)); |
919 | ||
1da177e4 LT |
920 | /* Create the file name */ |
921 | sprintf(buf, "/lib/lib%d.so", id); | |
922 | ||
923 | /* Open the file up */ | |
924 | bprm.filename = buf; | |
925 | bprm.file = open_exec(bprm.filename); | |
926 | res = PTR_ERR(bprm.file); | |
927 | if (IS_ERR(bprm.file)) | |
928 | return res; | |
929 | ||
867bfa4a | 930 | res = kernel_read(bprm.file, bprm.buf, BINPRM_BUF_SIZE, &pos); |
1da177e4 | 931 | |
867bfa4a | 932 | if (res >= 0) |
1da177e4 | 933 | res = load_flat_file(&bprm, libs, id, NULL); |
3440625d | 934 | |
3440625d LT |
935 | allow_write_access(bprm.file); |
936 | fput(bprm.file); | |
937 | ||
13c3f50c | 938 | return res; |
1da177e4 LT |
939 | } |
940 | ||
941 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
942 | /****************************************************************************/ | |
943 | ||
944 | /* | |
945 | * These are the functions used to load flat style executables and shared | |
946 | * libraries. There is no binary dependent code anywhere else. | |
947 | */ | |
948 | ||
13c3f50c | 949 | static int load_flat_binary(struct linux_binprm *bprm) |
1da177e4 LT |
950 | { |
951 | struct lib_info libinfo; | |
71613c3b | 952 | struct pt_regs *regs = current_pt_regs(); |
015feacf | 953 | unsigned long stack_len = 0; |
1da177e4 | 954 | unsigned long start_addr; |
1da177e4 LT |
955 | int res; |
956 | int i, j; | |
957 | ||
958 | memset(&libinfo, 0, sizeof(libinfo)); | |
13c3f50c | 959 | |
1da177e4 LT |
960 | /* |
961 | * We have to add the size of our arguments to our stack size | |
962 | * otherwise it's too easy for users to create stack overflows | |
963 | * by passing in a huge argument list. And yes, we have to be | |
964 | * pedantic and include space for the argv/envp array as it may have | |
965 | * a lot of entries. | |
966 | */ | |
015feacf NP |
967 | #ifndef CONFIG_MMU |
968 | stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */ | |
969 | #endif | |
a97d157d NP |
970 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
971 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ | |
972 | stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN); | |
13c3f50c | 973 | |
1da177e4 | 974 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
287980e4 | 975 | if (res < 0) |
1da177e4 | 976 | return res; |
13c3f50c | 977 | |
1da177e4 | 978 | /* Update data segment pointers for all libraries */ |
af521f92 NP |
979 | for (i = 0; i < MAX_SHARED_LIBS; i++) { |
980 | if (!libinfo.lib_list[i].loaded) | |
981 | continue; | |
982 | for (j = 0; j < MAX_SHARED_LIBS; j++) { | |
983 | unsigned long val = libinfo.lib_list[j].loaded ? | |
984 | libinfo.lib_list[j].start_data : UNLOADED_LIB; | |
985 | unsigned long __user *p = (unsigned long __user *) | |
986 | libinfo.lib_list[i].start_data; | |
987 | p -= j + 1; | |
988 | if (put_user(val, p)) | |
989 | return -EFAULT; | |
990 | } | |
991 | } | |
1da177e4 | 992 | |
1da177e4 LT |
993 | set_binfmt(&flat_format); |
994 | ||
015feacf NP |
995 | #ifdef CONFIG_MMU |
996 | res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); | |
997 | if (!res) | |
998 | res = create_flat_tables(bprm, bprm->p); | |
999 | #else | |
a97d157d NP |
1000 | /* Stash our initial stack pointer into the mm structure */ |
1001 | current->mm->start_stack = | |
1002 | ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; | |
1003 | pr_debug("sp=%lx\n", current->mm->start_stack); | |
1da177e4 | 1004 | |
687fd773 | 1005 | /* copy the arg pages onto the stack */ |
a97d157d NP |
1006 | res = transfer_args_to_stack(bprm, ¤t->mm->start_stack); |
1007 | if (!res) | |
1008 | res = create_flat_tables(bprm, current->mm->start_stack); | |
015feacf | 1009 | #endif |
687fd773 NP |
1010 | if (res) |
1011 | return res; | |
1da177e4 | 1012 | |
1da177e4 LT |
1013 | /* Fake some return addresses to ensure the call chain will |
1014 | * initialise library in order for us. We are required to call | |
1015 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
1016 | */ | |
1017 | start_addr = libinfo.lib_list[0].entry; | |
1018 | ||
1019 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
13c3f50c | 1020 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
1da177e4 LT |
1021 | if (libinfo.lib_list[i].loaded) { |
1022 | /* Push previos first to call address */ | |
a97d157d NP |
1023 | unsigned long __user *sp; |
1024 | current->mm->start_stack -= sizeof(unsigned long); | |
1025 | sp = (unsigned long __user *)current->mm->start_stack; | |
8861fd57 AV |
1026 | if (put_user(start_addr, sp)) |
1027 | return -EFAULT; | |
1da177e4 LT |
1028 | start_addr = libinfo.lib_list[i].entry; |
1029 | } | |
1030 | } | |
1031 | #endif | |
13c3f50c | 1032 | |
74c27c43 TY |
1033 | #ifdef FLAT_PLAT_INIT |
1034 | FLAT_PLAT_INIT(regs); | |
1035 | #endif | |
13c3f50c | 1036 | |
b8383831 | 1037 | finalize_exec(bprm); |
4adbb6ac NP |
1038 | pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
1039 | regs, start_addr, current->mm->start_stack); | |
1da177e4 LT |
1040 | start_thread(regs, start_addr, current->mm->start_stack); |
1041 | ||
1da177e4 LT |
1042 | return 0; |
1043 | } | |
1044 | ||
1045 | /****************************************************************************/ | |
1046 | ||
1047 | static int __init init_flat_binfmt(void) | |
1048 | { | |
8fc3dc5a AV |
1049 | register_binfmt(&flat_format); |
1050 | return 0; | |
1da177e4 | 1051 | } |
1da177e4 | 1052 | core_initcall(init_flat_binfmt); |
1da177e4 LT |
1053 | |
1054 | /****************************************************************************/ |