| 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> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/mman.h> |
| 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> |
| 37 | #include <linux/syscalls.h> |
| 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> |
| 44 | #include <asm/page.h> |
| 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 | |
| 58 | /* |
| 59 | * User data (data section and bss) needs to be aligned. |
| 60 | * We pick 0x20 here because it is the max value elf2flt has always |
| 61 | * used in producing FLAT files, and because it seems to be large |
| 62 | * enough to make all the gcc alignment related tests happy. |
| 63 | */ |
| 64 | #define FLAT_DATA_ALIGN (0x20) |
| 65 | |
| 66 | /* |
| 67 | * User data (stack) also needs to be aligned. |
| 68 | * Here we can be a bit looser than the data sections since this |
| 69 | * needs to only meet arch ABI requirements. |
| 70 | */ |
| 71 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
| 72 | |
| 73 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
| 74 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
| 75 | |
| 76 | struct lib_info { |
| 77 | struct { |
| 78 | unsigned long start_code; /* Start of text segment */ |
| 79 | unsigned long start_data; /* Start of data segment */ |
| 80 | unsigned long start_brk; /* End of data segment */ |
| 81 | unsigned long text_len; /* Length of text segment */ |
| 82 | unsigned long entry; /* Start address for this module */ |
| 83 | unsigned long build_date; /* When this one was compiled */ |
| 84 | short loaded; /* Has this library been loaded? */ |
| 85 | } lib_list[MAX_SHARED_LIBS]; |
| 86 | }; |
| 87 | |
| 88 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 89 | static int load_flat_shared_library(int id, struct lib_info *p); |
| 90 | #endif |
| 91 | |
| 92 | static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs); |
| 93 | static int flat_core_dump(struct coredump_params *cprm); |
| 94 | |
| 95 | static struct linux_binfmt flat_format = { |
| 96 | .module = THIS_MODULE, |
| 97 | .load_binary = load_flat_binary, |
| 98 | .core_dump = flat_core_dump, |
| 99 | .min_coredump = PAGE_SIZE |
| 100 | }; |
| 101 | |
| 102 | /****************************************************************************/ |
| 103 | /* |
| 104 | * Routine writes a core dump image in the current directory. |
| 105 | * Currently only a stub-function. |
| 106 | */ |
| 107 | |
| 108 | static int flat_core_dump(struct coredump_params *cprm) |
| 109 | { |
| 110 | printk("Process %s:%d received signr %d and should have core dumped\n", |
| 111 | current->comm, current->pid, (int) cprm->signr); |
| 112 | return(1); |
| 113 | } |
| 114 | |
| 115 | /****************************************************************************/ |
| 116 | /* |
| 117 | * create_flat_tables() parses the env- and arg-strings in new user |
| 118 | * memory and creates the pointer tables from them, and puts their |
| 119 | * addresses on the "stack", returning the new stack pointer value. |
| 120 | */ |
| 121 | |
| 122 | static unsigned long create_flat_tables( |
| 123 | unsigned long pp, |
| 124 | struct linux_binprm * bprm) |
| 125 | { |
| 126 | unsigned long *argv,*envp; |
| 127 | unsigned long * sp; |
| 128 | char * p = (char*)pp; |
| 129 | int argc = bprm->argc; |
| 130 | int envc = bprm->envc; |
| 131 | char uninitialized_var(dummy); |
| 132 | |
| 133 | sp = (unsigned long *)p; |
| 134 | sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
| 135 | sp = (unsigned long *) ((unsigned long)sp & -FLAT_STACK_ALIGN); |
| 136 | argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
| 137 | envp = argv + (argc + 1); |
| 138 | |
| 139 | if (flat_argvp_envp_on_stack()) { |
| 140 | put_user((unsigned long) envp, sp + 2); |
| 141 | put_user((unsigned long) argv, sp + 1); |
| 142 | } |
| 143 | |
| 144 | put_user(argc, sp); |
| 145 | current->mm->arg_start = (unsigned long) p; |
| 146 | while (argc-->0) { |
| 147 | put_user((unsigned long) p, argv++); |
| 148 | do { |
| 149 | get_user(dummy, p); p++; |
| 150 | } while (dummy); |
| 151 | } |
| 152 | put_user((unsigned long) NULL, argv); |
| 153 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
| 154 | while (envc-->0) { |
| 155 | put_user((unsigned long)p, envp); envp++; |
| 156 | do { |
| 157 | get_user(dummy, p); p++; |
| 158 | } while (dummy); |
| 159 | } |
| 160 | put_user((unsigned long) NULL, envp); |
| 161 | current->mm->env_end = (unsigned long) p; |
| 162 | return (unsigned long)sp; |
| 163 | } |
| 164 | |
| 165 | /****************************************************************************/ |
| 166 | |
| 167 | #ifdef CONFIG_BINFMT_ZFLAT |
| 168 | |
| 169 | #include <linux/zlib.h> |
| 170 | |
| 171 | #define LBUFSIZE 4000 |
| 172 | |
| 173 | /* gzip flag byte */ |
| 174 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ |
| 175 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ |
| 176 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ |
| 177 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ |
| 178 | #define COMMENT 0x10 /* bit 4 set: file comment present */ |
| 179 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ |
| 180 | #define RESERVED 0xC0 /* bit 6,7: reserved */ |
| 181 | |
| 182 | static int decompress_exec( |
| 183 | struct linux_binprm *bprm, |
| 184 | unsigned long offset, |
| 185 | char *dst, |
| 186 | long len, |
| 187 | int fd) |
| 188 | { |
| 189 | unsigned char *buf; |
| 190 | z_stream strm; |
| 191 | loff_t fpos; |
| 192 | int ret, retval; |
| 193 | |
| 194 | DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); |
| 195 | |
| 196 | memset(&strm, 0, sizeof(strm)); |
| 197 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
| 198 | if (strm.workspace == NULL) { |
| 199 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); |
| 200 | return -ENOMEM; |
| 201 | } |
| 202 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
| 203 | if (buf == NULL) { |
| 204 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); |
| 205 | retval = -ENOMEM; |
| 206 | goto out_free; |
| 207 | } |
| 208 | |
| 209 | /* Read in first chunk of data and parse gzip header. */ |
| 210 | fpos = offset; |
| 211 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
| 212 | |
| 213 | strm.next_in = buf; |
| 214 | strm.avail_in = ret; |
| 215 | strm.total_in = 0; |
| 216 | |
| 217 | retval = -ENOEXEC; |
| 218 | |
| 219 | /* Check minimum size -- gzip header */ |
| 220 | if (ret < 10) { |
| 221 | DBG_FLT("binfmt_flat: file too small?\n"); |
| 222 | goto out_free_buf; |
| 223 | } |
| 224 | |
| 225 | /* Check gzip magic number */ |
| 226 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
| 227 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); |
| 228 | goto out_free_buf; |
| 229 | } |
| 230 | |
| 231 | /* Check gzip method */ |
| 232 | if (buf[2] != 8) { |
| 233 | DBG_FLT("binfmt_flat: unknown compression method?\n"); |
| 234 | goto out_free_buf; |
| 235 | } |
| 236 | /* Check gzip flags */ |
| 237 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
| 238 | (buf[3] & RESERVED)) { |
| 239 | DBG_FLT("binfmt_flat: unknown flags?\n"); |
| 240 | goto out_free_buf; |
| 241 | } |
| 242 | |
| 243 | ret = 10; |
| 244 | if (buf[3] & EXTRA_FIELD) { |
| 245 | ret += 2 + buf[10] + (buf[11] << 8); |
| 246 | if (unlikely(LBUFSIZE <= ret)) { |
| 247 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); |
| 248 | goto out_free_buf; |
| 249 | } |
| 250 | } |
| 251 | if (buf[3] & ORIG_NAME) { |
| 252 | while (ret < LBUFSIZE && buf[ret++] != 0) |
| 253 | ; |
| 254 | if (unlikely(LBUFSIZE == ret)) { |
| 255 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); |
| 256 | goto out_free_buf; |
| 257 | } |
| 258 | } |
| 259 | if (buf[3] & COMMENT) { |
| 260 | while (ret < LBUFSIZE && buf[ret++] != 0) |
| 261 | ; |
| 262 | if (unlikely(LBUFSIZE == ret)) { |
| 263 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); |
| 264 | goto out_free_buf; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | strm.next_in += ret; |
| 269 | strm.avail_in -= ret; |
| 270 | |
| 271 | strm.next_out = dst; |
| 272 | strm.avail_out = len; |
| 273 | strm.total_out = 0; |
| 274 | |
| 275 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { |
| 276 | DBG_FLT("binfmt_flat: zlib init failed?\n"); |
| 277 | goto out_free_buf; |
| 278 | } |
| 279 | |
| 280 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
| 281 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
| 282 | if (ret <= 0) |
| 283 | break; |
| 284 | len -= ret; |
| 285 | |
| 286 | strm.next_in = buf; |
| 287 | strm.avail_in = ret; |
| 288 | strm.total_in = 0; |
| 289 | } |
| 290 | |
| 291 | if (ret < 0) { |
| 292 | DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", |
| 293 | ret, strm.msg); |
| 294 | goto out_zlib; |
| 295 | } |
| 296 | |
| 297 | retval = 0; |
| 298 | out_zlib: |
| 299 | zlib_inflateEnd(&strm); |
| 300 | out_free_buf: |
| 301 | kfree(buf); |
| 302 | out_free: |
| 303 | kfree(strm.workspace); |
| 304 | return retval; |
| 305 | } |
| 306 | |
| 307 | #endif /* CONFIG_BINFMT_ZFLAT */ |
| 308 | |
| 309 | /****************************************************************************/ |
| 310 | |
| 311 | static unsigned long |
| 312 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) |
| 313 | { |
| 314 | unsigned long addr; |
| 315 | int id; |
| 316 | unsigned long start_brk; |
| 317 | unsigned long start_data; |
| 318 | unsigned long text_len; |
| 319 | unsigned long start_code; |
| 320 | |
| 321 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 322 | if (r == 0) |
| 323 | id = curid; /* Relocs of 0 are always self referring */ |
| 324 | else { |
| 325 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ |
| 326 | r &= 0x00ffffff; /* Trim ID off here */ |
| 327 | } |
| 328 | if (id >= MAX_SHARED_LIBS) { |
| 329 | printk("BINFMT_FLAT: reference 0x%x to shared library %d", |
| 330 | (unsigned) r, id); |
| 331 | goto failed; |
| 332 | } |
| 333 | if (curid != id) { |
| 334 | if (internalp) { |
| 335 | printk("BINFMT_FLAT: reloc address 0x%x not in same module " |
| 336 | "(%d != %d)", (unsigned) r, curid, id); |
| 337 | goto failed; |
| 338 | } else if ( ! p->lib_list[id].loaded && |
| 339 | IS_ERR_VALUE(load_flat_shared_library(id, p))) { |
| 340 | printk("BINFMT_FLAT: failed to load library %d", id); |
| 341 | goto failed; |
| 342 | } |
| 343 | /* Check versioning information (i.e. time stamps) */ |
| 344 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && |
| 345 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { |
| 346 | printk("BINFMT_FLAT: library %d is younger than %d", id, curid); |
| 347 | goto failed; |
| 348 | } |
| 349 | } |
| 350 | #else |
| 351 | id = 0; |
| 352 | #endif |
| 353 | |
| 354 | start_brk = p->lib_list[id].start_brk; |
| 355 | start_data = p->lib_list[id].start_data; |
| 356 | start_code = p->lib_list[id].start_code; |
| 357 | text_len = p->lib_list[id].text_len; |
| 358 | |
| 359 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { |
| 360 | printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)", |
| 361 | (int) r,(int)(start_brk-start_data+text_len),(int)text_len); |
| 362 | goto failed; |
| 363 | } |
| 364 | |
| 365 | if (r < text_len) /* In text segment */ |
| 366 | addr = r + start_code; |
| 367 | else /* In data segment */ |
| 368 | addr = r - text_len + start_data; |
| 369 | |
| 370 | /* Range checked already above so doing the range tests is redundant...*/ |
| 371 | return(addr); |
| 372 | |
| 373 | failed: |
| 374 | printk(", killing %s!\n", current->comm); |
| 375 | send_sig(SIGSEGV, current, 0); |
| 376 | |
| 377 | return RELOC_FAILED; |
| 378 | } |
| 379 | |
| 380 | /****************************************************************************/ |
| 381 | |
| 382 | void old_reloc(unsigned long rl) |
| 383 | { |
| 384 | #ifdef DEBUG |
| 385 | char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
| 386 | #endif |
| 387 | flat_v2_reloc_t r; |
| 388 | unsigned long *ptr; |
| 389 | |
| 390 | r.value = rl; |
| 391 | #if defined(CONFIG_COLDFIRE) |
| 392 | ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset); |
| 393 | #else |
| 394 | ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset); |
| 395 | #endif |
| 396 | |
| 397 | #ifdef DEBUG |
| 398 | printk("Relocation of variable at DATASEG+%x " |
| 399 | "(address %p, currently %x) into segment %s\n", |
| 400 | r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]); |
| 401 | #endif |
| 402 | |
| 403 | switch (r.reloc.type) { |
| 404 | case OLD_FLAT_RELOC_TYPE_TEXT: |
| 405 | *ptr += current->mm->start_code; |
| 406 | break; |
| 407 | case OLD_FLAT_RELOC_TYPE_DATA: |
| 408 | *ptr += current->mm->start_data; |
| 409 | break; |
| 410 | case OLD_FLAT_RELOC_TYPE_BSS: |
| 411 | *ptr += current->mm->end_data; |
| 412 | break; |
| 413 | default: |
| 414 | printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type); |
| 415 | break; |
| 416 | } |
| 417 | |
| 418 | #ifdef DEBUG |
| 419 | printk("Relocation became %x\n", (int)*ptr); |
| 420 | #endif |
| 421 | } |
| 422 | |
| 423 | /****************************************************************************/ |
| 424 | |
| 425 | static int load_flat_file(struct linux_binprm * bprm, |
| 426 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
| 427 | { |
| 428 | struct flat_hdr * hdr; |
| 429 | unsigned long textpos = 0, datapos = 0, result; |
| 430 | unsigned long realdatastart = 0; |
| 431 | unsigned long text_len, data_len, bss_len, stack_len, flags; |
| 432 | unsigned long len, memp = 0; |
| 433 | unsigned long memp_size, extra, rlim; |
| 434 | unsigned long *reloc = 0, *rp; |
| 435 | struct inode *inode; |
| 436 | int i, rev, relocs = 0; |
| 437 | loff_t fpos; |
| 438 | unsigned long start_code, end_code; |
| 439 | int ret; |
| 440 | |
| 441 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
| 442 | inode = bprm->file->f_path.dentry->d_inode; |
| 443 | |
| 444 | text_len = ntohl(hdr->data_start); |
| 445 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
| 446 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
| 447 | stack_len = ntohl(hdr->stack_size); |
| 448 | if (extra_stack) { |
| 449 | stack_len += *extra_stack; |
| 450 | *extra_stack = stack_len; |
| 451 | } |
| 452 | relocs = ntohl(hdr->reloc_count); |
| 453 | flags = ntohl(hdr->flags); |
| 454 | rev = ntohl(hdr->rev); |
| 455 | |
| 456 | if (strncmp(hdr->magic, "bFLT", 4)) { |
| 457 | /* |
| 458 | * Previously, here was a printk to tell people |
| 459 | * "BINFMT_FLAT: bad header magic". |
| 460 | * But for the kernel which also use ELF FD-PIC format, this |
| 461 | * error message is confusing. |
| 462 | * because a lot of people do not manage to produce good |
| 463 | */ |
| 464 | ret = -ENOEXEC; |
| 465 | goto err; |
| 466 | } |
| 467 | |
| 468 | if (flags & FLAT_FLAG_KTRACE) |
| 469 | printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename); |
| 470 | |
| 471 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
| 472 | printk("BINFMT_FLAT: bad flat file version 0x%x (supported " |
| 473 | "0x%lx and 0x%lx)\n", |
| 474 | rev, FLAT_VERSION, OLD_FLAT_VERSION); |
| 475 | ret = -ENOEXEC; |
| 476 | goto err; |
| 477 | } |
| 478 | |
| 479 | /* Don't allow old format executables to use shared libraries */ |
| 480 | if (rev == OLD_FLAT_VERSION && id != 0) { |
| 481 | printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n", |
| 482 | (int) FLAT_VERSION); |
| 483 | ret = -ENOEXEC; |
| 484 | goto err; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * fix up the flags for the older format, there were all kinds |
| 489 | * of endian hacks, this only works for the simple cases |
| 490 | */ |
| 491 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) |
| 492 | flags = FLAT_FLAG_RAM; |
| 493 | |
| 494 | #ifndef CONFIG_BINFMT_ZFLAT |
| 495 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
| 496 | printk("Support for ZFLAT executables is not enabled.\n"); |
| 497 | ret = -ENOEXEC; |
| 498 | goto err; |
| 499 | } |
| 500 | #endif |
| 501 | |
| 502 | /* |
| 503 | * Check initial limits. This avoids letting people circumvent |
| 504 | * size limits imposed on them by creating programs with large |
| 505 | * arrays in the data or bss. |
| 506 | */ |
| 507 | rlim = rlimit(RLIMIT_DATA); |
| 508 | if (rlim >= RLIM_INFINITY) |
| 509 | rlim = ~0; |
| 510 | if (data_len + bss_len > rlim) { |
| 511 | ret = -ENOMEM; |
| 512 | goto err; |
| 513 | } |
| 514 | |
| 515 | /* Flush all traces of the currently running executable */ |
| 516 | if (id == 0) { |
| 517 | result = flush_old_exec(bprm); |
| 518 | if (result) { |
| 519 | ret = result; |
| 520 | goto err; |
| 521 | } |
| 522 | |
| 523 | /* OK, This is the point of no return */ |
| 524 | set_personality(PER_LINUX_32BIT); |
| 525 | setup_new_exec(bprm); |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * calculate the extra space we need to map in |
| 530 | */ |
| 531 | extra = max_t(unsigned long, bss_len + stack_len, |
| 532 | relocs * sizeof(unsigned long)); |
| 533 | |
| 534 | /* |
| 535 | * there are a couple of cases here, the separate code/data |
| 536 | * case, and then the fully copied to RAM case which lumps |
| 537 | * it all together. |
| 538 | */ |
| 539 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { |
| 540 | /* |
| 541 | * this should give us a ROM ptr, but if it doesn't we don't |
| 542 | * really care |
| 543 | */ |
| 544 | DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); |
| 545 | |
| 546 | down_write(¤t->mm->mmap_sem); |
| 547 | textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
| 548 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
| 549 | up_write(¤t->mm->mmap_sem); |
| 550 | if (!textpos || IS_ERR_VALUE(textpos)) { |
| 551 | if (!textpos) |
| 552 | textpos = (unsigned long) -ENOMEM; |
| 553 | printk("Unable to mmap process text, errno %d\n", (int)-textpos); |
| 554 | ret = textpos; |
| 555 | goto err; |
| 556 | } |
| 557 | |
| 558 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
| 559 | len = PAGE_ALIGN(len); |
| 560 | down_write(¤t->mm->mmap_sem); |
| 561 | realdatastart = do_mmap(0, 0, len, |
| 562 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
| 563 | up_write(¤t->mm->mmap_sem); |
| 564 | |
| 565 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
| 566 | if (!realdatastart) |
| 567 | realdatastart = (unsigned long) -ENOMEM; |
| 568 | printk("Unable to allocate RAM for process data, errno %d\n", |
| 569 | (int)-realdatastart); |
| 570 | do_munmap(current->mm, textpos, text_len); |
| 571 | ret = realdatastart; |
| 572 | goto err; |
| 573 | } |
| 574 | datapos = ALIGN(realdatastart + |
| 575 | MAX_SHARED_LIBS * sizeof(unsigned long), |
| 576 | FLAT_DATA_ALIGN); |
| 577 | |
| 578 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", |
| 579 | (int)(data_len + bss_len + stack_len), (int)datapos); |
| 580 | |
| 581 | fpos = ntohl(hdr->data_start); |
| 582 | #ifdef CONFIG_BINFMT_ZFLAT |
| 583 | if (flags & FLAT_FLAG_GZDATA) { |
| 584 | result = decompress_exec(bprm, fpos, (char *) datapos, |
| 585 | data_len + (relocs * sizeof(unsigned long)), 0); |
| 586 | } else |
| 587 | #endif |
| 588 | { |
| 589 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
| 590 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
| 591 | } |
| 592 | if (IS_ERR_VALUE(result)) { |
| 593 | printk("Unable to read data+bss, errno %d\n", (int)-result); |
| 594 | do_munmap(current->mm, textpos, text_len); |
| 595 | do_munmap(current->mm, realdatastart, len); |
| 596 | ret = result; |
| 597 | goto err; |
| 598 | } |
| 599 | |
| 600 | reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); |
| 601 | memp = realdatastart; |
| 602 | memp_size = len; |
| 603 | } else { |
| 604 | |
| 605 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
| 606 | len = PAGE_ALIGN(len); |
| 607 | down_write(¤t->mm->mmap_sem); |
| 608 | textpos = do_mmap(0, 0, len, |
| 609 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
| 610 | up_write(¤t->mm->mmap_sem); |
| 611 | |
| 612 | if (!textpos || IS_ERR_VALUE(textpos)) { |
| 613 | if (!textpos) |
| 614 | textpos = (unsigned long) -ENOMEM; |
| 615 | printk("Unable to allocate RAM for process text/data, errno %d\n", |
| 616 | (int)-textpos); |
| 617 | ret = textpos; |
| 618 | goto err; |
| 619 | } |
| 620 | |
| 621 | realdatastart = textpos + ntohl(hdr->data_start); |
| 622 | datapos = ALIGN(realdatastart + |
| 623 | MAX_SHARED_LIBS * sizeof(unsigned long), |
| 624 | FLAT_DATA_ALIGN); |
| 625 | |
| 626 | reloc = (unsigned long *) |
| 627 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
| 628 | memp = textpos; |
| 629 | memp_size = len; |
| 630 | #ifdef CONFIG_BINFMT_ZFLAT |
| 631 | /* |
| 632 | * load it all in and treat it like a RAM load from now on |
| 633 | */ |
| 634 | if (flags & FLAT_FLAG_GZIP) { |
| 635 | result = decompress_exec(bprm, sizeof (struct flat_hdr), |
| 636 | (((char *) textpos) + sizeof (struct flat_hdr)), |
| 637 | (text_len + data_len + (relocs * sizeof(unsigned long)) |
| 638 | - sizeof (struct flat_hdr)), |
| 639 | 0); |
| 640 | memmove((void *) datapos, (void *) realdatastart, |
| 641 | data_len + (relocs * sizeof(unsigned long))); |
| 642 | } else if (flags & FLAT_FLAG_GZDATA) { |
| 643 | fpos = 0; |
| 644 | result = bprm->file->f_op->read(bprm->file, |
| 645 | (char *) textpos, text_len, &fpos); |
| 646 | if (!IS_ERR_VALUE(result)) |
| 647 | result = decompress_exec(bprm, text_len, (char *) datapos, |
| 648 | data_len + (relocs * sizeof(unsigned long)), 0); |
| 649 | } |
| 650 | else |
| 651 | #endif |
| 652 | { |
| 653 | fpos = 0; |
| 654 | result = bprm->file->f_op->read(bprm->file, |
| 655 | (char *) textpos, text_len, &fpos); |
| 656 | if (!IS_ERR_VALUE(result)) { |
| 657 | fpos = ntohl(hdr->data_start); |
| 658 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
| 659 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
| 660 | } |
| 661 | } |
| 662 | if (IS_ERR_VALUE(result)) { |
| 663 | printk("Unable to read code+data+bss, errno %d\n",(int)-result); |
| 664 | do_munmap(current->mm, textpos, text_len + data_len + extra + |
| 665 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
| 666 | ret = result; |
| 667 | goto err; |
| 668 | } |
| 669 | } |
| 670 | |
| 671 | if (flags & FLAT_FLAG_KTRACE) |
| 672 | printk("Mapping is %x, Entry point is %x, data_start is %x\n", |
| 673 | (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
| 674 | |
| 675 | /* The main program needs a little extra setup in the task structure */ |
| 676 | start_code = textpos + sizeof (struct flat_hdr); |
| 677 | end_code = textpos + text_len; |
| 678 | if (id == 0) { |
| 679 | current->mm->start_code = start_code; |
| 680 | current->mm->end_code = end_code; |
| 681 | current->mm->start_data = datapos; |
| 682 | current->mm->end_data = datapos + data_len; |
| 683 | /* |
| 684 | * set up the brk stuff, uses any slack left in data/bss/stack |
| 685 | * allocation. We put the brk after the bss (between the bss |
| 686 | * and stack) like other platforms. |
| 687 | * Userspace code relies on the stack pointer starting out at |
| 688 | * an address right at the end of a page. |
| 689 | */ |
| 690 | current->mm->start_brk = datapos + data_len + bss_len; |
| 691 | current->mm->brk = (current->mm->start_brk + 3) & ~3; |
| 692 | current->mm->context.end_brk = memp + memp_size - stack_len; |
| 693 | } |
| 694 | |
| 695 | if (flags & FLAT_FLAG_KTRACE) |
| 696 | printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", |
| 697 | id ? "Lib" : "Load", bprm->filename, |
| 698 | (int) start_code, (int) end_code, |
| 699 | (int) datapos, |
| 700 | (int) (datapos + data_len), |
| 701 | (int) (datapos + data_len), |
| 702 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); |
| 703 | |
| 704 | text_len -= sizeof(struct flat_hdr); /* the real code len */ |
| 705 | |
| 706 | /* Store the current module values into the global library structure */ |
| 707 | libinfo->lib_list[id].start_code = start_code; |
| 708 | libinfo->lib_list[id].start_data = datapos; |
| 709 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; |
| 710 | libinfo->lib_list[id].text_len = text_len; |
| 711 | libinfo->lib_list[id].loaded = 1; |
| 712 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
| 713 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); |
| 714 | |
| 715 | /* |
| 716 | * We just load the allocations into some temporary memory to |
| 717 | * help simplify all this mumbo jumbo |
| 718 | * |
| 719 | * We've got two different sections of relocation entries. |
| 720 | * The first is the GOT which resides at the beginning of the data segment |
| 721 | * and is terminated with a -1. This one can be relocated in place. |
| 722 | * The second is the extra relocation entries tacked after the image's |
| 723 | * data segment. These require a little more processing as the entry is |
| 724 | * really an offset into the image which contains an offset into the |
| 725 | * image. |
| 726 | */ |
| 727 | if (flags & FLAT_FLAG_GOTPIC) { |
| 728 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { |
| 729 | unsigned long addr; |
| 730 | if (*rp) { |
| 731 | addr = calc_reloc(*rp, libinfo, id, 0); |
| 732 | if (addr == RELOC_FAILED) { |
| 733 | ret = -ENOEXEC; |
| 734 | goto err; |
| 735 | } |
| 736 | *rp = addr; |
| 737 | } |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * Now run through the relocation entries. |
| 743 | * We've got to be careful here as C++ produces relocatable zero |
| 744 | * entries in the constructor and destructor tables which are then |
| 745 | * tested for being not zero (which will always occur unless we're |
| 746 | * based from address zero). This causes an endless loop as __start |
| 747 | * is at zero. The solution used is to not relocate zero addresses. |
| 748 | * This has the negative side effect of not allowing a global data |
| 749 | * reference to be statically initialised to _stext (I've moved |
| 750 | * __start to address 4 so that is okay). |
| 751 | */ |
| 752 | if (rev > OLD_FLAT_VERSION) { |
| 753 | unsigned long persistent = 0; |
| 754 | for (i=0; i < relocs; i++) { |
| 755 | unsigned long addr, relval; |
| 756 | |
| 757 | /* Get the address of the pointer to be |
| 758 | relocated (of course, the address has to be |
| 759 | relocated first). */ |
| 760 | relval = ntohl(reloc[i]); |
| 761 | if (flat_set_persistent (relval, &persistent)) |
| 762 | continue; |
| 763 | addr = flat_get_relocate_addr(relval); |
| 764 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); |
| 765 | if (rp == (unsigned long *)RELOC_FAILED) { |
| 766 | ret = -ENOEXEC; |
| 767 | goto err; |
| 768 | } |
| 769 | |
| 770 | /* Get the pointer's value. */ |
| 771 | addr = flat_get_addr_from_rp(rp, relval, flags, |
| 772 | &persistent); |
| 773 | if (addr != 0) { |
| 774 | /* |
| 775 | * Do the relocation. PIC relocs in the data section are |
| 776 | * already in target order |
| 777 | */ |
| 778 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
| 779 | addr = ntohl(addr); |
| 780 | addr = calc_reloc(addr, libinfo, id, 0); |
| 781 | if (addr == RELOC_FAILED) { |
| 782 | ret = -ENOEXEC; |
| 783 | goto err; |
| 784 | } |
| 785 | |
| 786 | /* Write back the relocated pointer. */ |
| 787 | flat_put_addr_at_rp(rp, addr, relval); |
| 788 | } |
| 789 | } |
| 790 | } else { |
| 791 | for (i=0; i < relocs; i++) |
| 792 | old_reloc(ntohl(reloc[i])); |
| 793 | } |
| 794 | |
| 795 | flush_icache_range(start_code, end_code); |
| 796 | |
| 797 | /* zero the BSS, BRK and stack areas */ |
| 798 | memset((void*)(datapos + data_len), 0, bss_len + |
| 799 | (memp + memp_size - stack_len - /* end brk */ |
| 800 | libinfo->lib_list[id].start_brk) + /* start brk */ |
| 801 | stack_len); |
| 802 | |
| 803 | return 0; |
| 804 | err: |
| 805 | return ret; |
| 806 | } |
| 807 | |
| 808 | |
| 809 | /****************************************************************************/ |
| 810 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 811 | |
| 812 | /* |
| 813 | * Load a shared library into memory. The library gets its own data |
| 814 | * segment (including bss) but not argv/argc/environ. |
| 815 | */ |
| 816 | |
| 817 | static int load_flat_shared_library(int id, struct lib_info *libs) |
| 818 | { |
| 819 | struct linux_binprm bprm; |
| 820 | int res; |
| 821 | char buf[16]; |
| 822 | |
| 823 | /* Create the file name */ |
| 824 | sprintf(buf, "/lib/lib%d.so", id); |
| 825 | |
| 826 | /* Open the file up */ |
| 827 | bprm.filename = buf; |
| 828 | bprm.file = open_exec(bprm.filename); |
| 829 | res = PTR_ERR(bprm.file); |
| 830 | if (IS_ERR(bprm.file)) |
| 831 | return res; |
| 832 | |
| 833 | bprm.cred = prepare_exec_creds(); |
| 834 | res = -ENOMEM; |
| 835 | if (!bprm.cred) |
| 836 | goto out; |
| 837 | |
| 838 | res = prepare_binprm(&bprm); |
| 839 | |
| 840 | if (!IS_ERR_VALUE(res)) |
| 841 | res = load_flat_file(&bprm, libs, id, NULL); |
| 842 | |
| 843 | abort_creds(bprm.cred); |
| 844 | |
| 845 | out: |
| 846 | allow_write_access(bprm.file); |
| 847 | fput(bprm.file); |
| 848 | |
| 849 | return(res); |
| 850 | } |
| 851 | |
| 852 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
| 853 | /****************************************************************************/ |
| 854 | |
| 855 | /* |
| 856 | * These are the functions used to load flat style executables and shared |
| 857 | * libraries. There is no binary dependent code anywhere else. |
| 858 | */ |
| 859 | |
| 860 | static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
| 861 | { |
| 862 | struct lib_info libinfo; |
| 863 | unsigned long p = bprm->p; |
| 864 | unsigned long stack_len; |
| 865 | unsigned long start_addr; |
| 866 | unsigned long *sp; |
| 867 | int res; |
| 868 | int i, j; |
| 869 | |
| 870 | memset(&libinfo, 0, sizeof(libinfo)); |
| 871 | /* |
| 872 | * We have to add the size of our arguments to our stack size |
| 873 | * otherwise it's too easy for users to create stack overflows |
| 874 | * by passing in a huge argument list. And yes, we have to be |
| 875 | * pedantic and include space for the argv/envp array as it may have |
| 876 | * a lot of entries. |
| 877 | */ |
| 878 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
| 879 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
| 880 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
| 881 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
| 882 | stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */ |
| 883 | |
| 884 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
| 885 | if (IS_ERR_VALUE(res)) |
| 886 | return res; |
| 887 | |
| 888 | /* Update data segment pointers for all libraries */ |
| 889 | for (i=0; i<MAX_SHARED_LIBS; i++) |
| 890 | if (libinfo.lib_list[i].loaded) |
| 891 | for (j=0; j<MAX_SHARED_LIBS; j++) |
| 892 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = |
| 893 | (libinfo.lib_list[j].loaded)? |
| 894 | libinfo.lib_list[j].start_data:UNLOADED_LIB; |
| 895 | |
| 896 | install_exec_creds(bprm); |
| 897 | current->flags &= ~PF_FORKNOEXEC; |
| 898 | |
| 899 | set_binfmt(&flat_format); |
| 900 | |
| 901 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
| 902 | DBG_FLT("p=%x\n", (int)p); |
| 903 | |
| 904 | /* copy the arg pages onto the stack, this could be more efficient :-) */ |
| 905 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) |
| 906 | * (char *) --p = |
| 907 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; |
| 908 | |
| 909 | sp = (unsigned long *) create_flat_tables(p, bprm); |
| 910 | |
| 911 | /* Fake some return addresses to ensure the call chain will |
| 912 | * initialise library in order for us. We are required to call |
| 913 | * lib 1 first, then 2, ... and finally the main program (id 0). |
| 914 | */ |
| 915 | start_addr = libinfo.lib_list[0].entry; |
| 916 | |
| 917 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 918 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { |
| 919 | if (libinfo.lib_list[i].loaded) { |
| 920 | /* Push previos first to call address */ |
| 921 | --sp; put_user(start_addr, sp); |
| 922 | start_addr = libinfo.lib_list[i].entry; |
| 923 | } |
| 924 | } |
| 925 | #endif |
| 926 | |
| 927 | /* Stash our initial stack pointer into the mm structure */ |
| 928 | current->mm->start_stack = (unsigned long )sp; |
| 929 | |
| 930 | #ifdef FLAT_PLAT_INIT |
| 931 | FLAT_PLAT_INIT(regs); |
| 932 | #endif |
| 933 | DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n", |
| 934 | (int)regs, (int)start_addr, (int)current->mm->start_stack); |
| 935 | |
| 936 | start_thread(regs, start_addr, current->mm->start_stack); |
| 937 | |
| 938 | return 0; |
| 939 | } |
| 940 | |
| 941 | /****************************************************************************/ |
| 942 | |
| 943 | static int __init init_flat_binfmt(void) |
| 944 | { |
| 945 | return register_binfmt(&flat_format); |
| 946 | } |
| 947 | |
| 948 | /****************************************************************************/ |
| 949 | |
| 950 | core_initcall(init_flat_binfmt); |
| 951 | |
| 952 | /****************************************************************************/ |