Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * a.out loader for x86-64 |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds |
| 5 | * Hacked together by Andi Kleen |
| 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | |
| 10 | #include <linux/time.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/mman.h> |
| 14 | #include <linux/a.out.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/signal.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/file.h> |
| 20 | #include <linux/stat.h> |
| 21 | #include <linux/fcntl.h> |
| 22 | #include <linux/ptrace.h> |
| 23 | #include <linux/user.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/binfmts.h> |
| 26 | #include <linux/personality.h> |
| 27 | #include <linux/init.h> |
| 28 | |
| 29 | #include <asm/system.h> |
| 30 | #include <asm/uaccess.h> |
| 31 | #include <asm/pgalloc.h> |
| 32 | #include <asm/cacheflush.h> |
| 33 | #include <asm/user32.h> |
| 34 | #include <asm/ia32.h> |
| 35 | |
| 36 | #undef WARN_OLD |
| 37 | #undef CORE_DUMP /* probably broken */ |
| 38 | |
| 39 | extern int ia32_setup_arg_pages(struct linux_binprm *bprm, |
| 40 | unsigned long stack_top, int exec_stack); |
| 41 | |
| 42 | static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs); |
| 43 | static int load_aout_library(struct file*); |
| 44 | |
| 45 | #if CORE_DUMP |
| 46 | static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file); |
| 47 | |
| 48 | /* |
| 49 | * fill in the user structure for a core dump.. |
| 50 | */ |
| 51 | static void dump_thread32(struct pt_regs * regs, struct user32 * dump) |
| 52 | { |
| 53 | u32 fs,gs; |
| 54 | |
| 55 | /* changed the size calculations - should hopefully work better. lbt */ |
| 56 | dump->magic = CMAGIC; |
| 57 | dump->start_code = 0; |
| 58 | dump->start_stack = regs->rsp & ~(PAGE_SIZE - 1); |
| 59 | dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; |
| 60 | dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT; |
| 61 | dump->u_dsize -= dump->u_tsize; |
| 62 | dump->u_ssize = 0; |
| 63 | dump->u_debugreg[0] = current->thread.debugreg0; |
| 64 | dump->u_debugreg[1] = current->thread.debugreg1; |
| 65 | dump->u_debugreg[2] = current->thread.debugreg2; |
| 66 | dump->u_debugreg[3] = current->thread.debugreg3; |
| 67 | dump->u_debugreg[4] = 0; |
| 68 | dump->u_debugreg[5] = 0; |
| 69 | dump->u_debugreg[6] = current->thread.debugreg6; |
| 70 | dump->u_debugreg[7] = current->thread.debugreg7; |
| 71 | |
| 72 | if (dump->start_stack < 0xc0000000) |
| 73 | dump->u_ssize = ((unsigned long) (0xc0000000 - dump->start_stack)) >> PAGE_SHIFT; |
| 74 | |
| 75 | dump->regs.ebx = regs->rbx; |
| 76 | dump->regs.ecx = regs->rcx; |
| 77 | dump->regs.edx = regs->rdx; |
| 78 | dump->regs.esi = regs->rsi; |
| 79 | dump->regs.edi = regs->rdi; |
| 80 | dump->regs.ebp = regs->rbp; |
| 81 | dump->regs.eax = regs->rax; |
| 82 | dump->regs.ds = current->thread.ds; |
| 83 | dump->regs.es = current->thread.es; |
| 84 | asm("movl %%fs,%0" : "=r" (fs)); dump->regs.fs = fs; |
| 85 | asm("movl %%gs,%0" : "=r" (gs)); dump->regs.gs = gs; |
| 86 | dump->regs.orig_eax = regs->orig_rax; |
| 87 | dump->regs.eip = regs->rip; |
| 88 | dump->regs.cs = regs->cs; |
| 89 | dump->regs.eflags = regs->eflags; |
| 90 | dump->regs.esp = regs->rsp; |
| 91 | dump->regs.ss = regs->ss; |
| 92 | |
| 93 | #if 1 /* FIXME */ |
| 94 | dump->u_fpvalid = 0; |
| 95 | #else |
| 96 | dump->u_fpvalid = dump_fpu (regs, &dump->i387); |
| 97 | #endif |
| 98 | } |
| 99 | |
| 100 | #endif |
| 101 | |
| 102 | static struct linux_binfmt aout_format = { |
| 103 | .module = THIS_MODULE, |
| 104 | .load_binary = load_aout_binary, |
| 105 | .load_shlib = load_aout_library, |
| 106 | #if CORE_DUMP |
| 107 | .core_dump = aout_core_dump, |
| 108 | #endif |
| 109 | .min_coredump = PAGE_SIZE |
| 110 | }; |
| 111 | |
| 112 | static void set_brk(unsigned long start, unsigned long end) |
| 113 | { |
| 114 | start = PAGE_ALIGN(start); |
| 115 | end = PAGE_ALIGN(end); |
| 116 | if (end <= start) |
| 117 | return; |
| 118 | down_write(¤t->mm->mmap_sem); |
| 119 | do_brk(start, end - start); |
| 120 | up_write(¤t->mm->mmap_sem); |
| 121 | } |
| 122 | |
| 123 | #if CORE_DUMP |
| 124 | /* |
| 125 | * These are the only things you should do on a core-file: use only these |
| 126 | * macros to write out all the necessary info. |
| 127 | */ |
| 128 | |
| 129 | static int dump_write(struct file *file, const void *addr, int nr) |
| 130 | { |
| 131 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; |
| 132 | } |
| 133 | |
| 134 | #define DUMP_WRITE(addr, nr) \ |
| 135 | if (!dump_write(file, (void *)(addr), (nr))) \ |
| 136 | goto end_coredump; |
| 137 | |
| 138 | #define DUMP_SEEK(offset) \ |
| 139 | if (file->f_op->llseek) { \ |
| 140 | if (file->f_op->llseek(file,(offset),0) != (offset)) \ |
| 141 | goto end_coredump; \ |
| 142 | } else file->f_pos = (offset) |
| 143 | |
| 144 | /* |
| 145 | * Routine writes a core dump image in the current directory. |
| 146 | * Currently only a stub-function. |
| 147 | * |
| 148 | * Note that setuid/setgid files won't make a core-dump if the uid/gid |
| 149 | * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable" |
| 150 | * field, which also makes sure the core-dumps won't be recursive if the |
| 151 | * dumping of the process results in another error.. |
| 152 | */ |
| 153 | |
| 154 | static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file) |
| 155 | { |
| 156 | mm_segment_t fs; |
| 157 | int has_dumped = 0; |
| 158 | unsigned long dump_start, dump_size; |
| 159 | struct user32 dump; |
| 160 | # define START_DATA(u) (u.u_tsize << PAGE_SHIFT) |
| 161 | # define START_STACK(u) (u.start_stack) |
| 162 | |
| 163 | fs = get_fs(); |
| 164 | set_fs(KERNEL_DS); |
| 165 | has_dumped = 1; |
| 166 | current->flags |= PF_DUMPCORE; |
| 167 | strncpy(dump.u_comm, current->comm, sizeof(current->comm)); |
| 168 | dump.u_ar0 = (u32)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump))); |
| 169 | dump.signal = signr; |
| 170 | dump_thread32(regs, &dump); |
| 171 | |
| 172 | /* If the size of the dump file exceeds the rlimit, then see what would happen |
| 173 | if we wrote the stack, but not the data area. */ |
| 174 | if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE > |
| 175 | current->signal->rlim[RLIMIT_CORE].rlim_cur) |
| 176 | dump.u_dsize = 0; |
| 177 | |
| 178 | /* Make sure we have enough room to write the stack and data areas. */ |
| 179 | if ((dump.u_ssize+1) * PAGE_SIZE > |
| 180 | current->signal->rlim[RLIMIT_CORE].rlim_cur) |
| 181 | dump.u_ssize = 0; |
| 182 | |
| 183 | /* make sure we actually have a data and stack area to dump */ |
| 184 | set_fs(USER_DS); |
| 185 | if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump), dump.u_dsize << PAGE_SHIFT)) |
| 186 | dump.u_dsize = 0; |
| 187 | if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump), dump.u_ssize << PAGE_SHIFT)) |
| 188 | dump.u_ssize = 0; |
| 189 | |
| 190 | set_fs(KERNEL_DS); |
| 191 | /* struct user */ |
| 192 | DUMP_WRITE(&dump,sizeof(dump)); |
| 193 | /* Now dump all of the user data. Include malloced stuff as well */ |
| 194 | DUMP_SEEK(PAGE_SIZE); |
| 195 | /* now we start writing out the user space info */ |
| 196 | set_fs(USER_DS); |
| 197 | /* Dump the data area */ |
| 198 | if (dump.u_dsize != 0) { |
| 199 | dump_start = START_DATA(dump); |
| 200 | dump_size = dump.u_dsize << PAGE_SHIFT; |
| 201 | DUMP_WRITE(dump_start,dump_size); |
| 202 | } |
| 203 | /* Now prepare to dump the stack area */ |
| 204 | if (dump.u_ssize != 0) { |
| 205 | dump_start = START_STACK(dump); |
| 206 | dump_size = dump.u_ssize << PAGE_SHIFT; |
| 207 | DUMP_WRITE(dump_start,dump_size); |
| 208 | } |
| 209 | /* Finally dump the task struct. Not be used by gdb, but could be useful */ |
| 210 | set_fs(KERNEL_DS); |
| 211 | DUMP_WRITE(current,sizeof(*current)); |
| 212 | end_coredump: |
| 213 | set_fs(fs); |
| 214 | return has_dumped; |
| 215 | } |
| 216 | #endif |
| 217 | |
| 218 | /* |
| 219 | * create_aout_tables() parses the env- and arg-strings in new user |
| 220 | * memory and creates the pointer tables from them, and puts their |
| 221 | * addresses on the "stack", returning the new stack pointer value. |
| 222 | */ |
| 223 | static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm) |
| 224 | { |
| 225 | u32 __user *argv; |
| 226 | u32 __user *envp; |
| 227 | u32 __user *sp; |
| 228 | int argc = bprm->argc; |
| 229 | int envc = bprm->envc; |
| 230 | |
| 231 | sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p); |
| 232 | sp -= envc+1; |
| 233 | envp = sp; |
| 234 | sp -= argc+1; |
| 235 | argv = sp; |
| 236 | put_user((unsigned long) envp,--sp); |
| 237 | put_user((unsigned long) argv,--sp); |
| 238 | put_user(argc,--sp); |
| 239 | current->mm->arg_start = (unsigned long) p; |
| 240 | while (argc-->0) { |
| 241 | char c; |
| 242 | put_user((u32)(unsigned long)p,argv++); |
| 243 | do { |
| 244 | get_user(c,p++); |
| 245 | } while (c); |
| 246 | } |
| 247 | put_user(NULL,argv); |
| 248 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
| 249 | while (envc-->0) { |
| 250 | char c; |
| 251 | put_user((u32)(unsigned long)p,envp++); |
| 252 | do { |
| 253 | get_user(c,p++); |
| 254 | } while (c); |
| 255 | } |
| 256 | put_user(NULL,envp); |
| 257 | current->mm->env_end = (unsigned long) p; |
| 258 | return sp; |
| 259 | } |
| 260 | |
| 261 | /* |
| 262 | * These are the functions used to load a.out style executables and shared |
| 263 | * libraries. There is no binary dependent code anywhere else. |
| 264 | */ |
| 265 | |
| 266 | static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
| 267 | { |
| 268 | struct exec ex; |
| 269 | unsigned long error; |
| 270 | unsigned long fd_offset; |
| 271 | unsigned long rlim; |
| 272 | int retval; |
| 273 | |
| 274 | ex = *((struct exec *) bprm->buf); /* exec-header */ |
| 275 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC && |
| 276 | N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) || |
| 277 | N_TRSIZE(ex) || N_DRSIZE(ex) || |
| 278 | i_size_read(bprm->file->f_dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { |
| 279 | return -ENOEXEC; |
| 280 | } |
| 281 | |
| 282 | fd_offset = N_TXTOFF(ex); |
| 283 | |
| 284 | /* Check initial limits. This avoids letting people circumvent |
| 285 | * size limits imposed on them by creating programs with large |
| 286 | * arrays in the data or bss. |
| 287 | */ |
| 288 | rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; |
| 289 | if (rlim >= RLIM_INFINITY) |
| 290 | rlim = ~0; |
| 291 | if (ex.a_data + ex.a_bss > rlim) |
| 292 | return -ENOMEM; |
| 293 | |
| 294 | /* Flush all traces of the currently running executable */ |
| 295 | retval = flush_old_exec(bprm); |
| 296 | if (retval) |
| 297 | return retval; |
| 298 | |
| 299 | regs->cs = __USER32_CS; |
| 300 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 = |
| 301 | regs->r13 = regs->r14 = regs->r15 = 0; |
| 302 | |
| 303 | /* OK, This is the point of no return */ |
| 304 | set_personality(PER_LINUX); |
| 305 | set_thread_flag(TIF_IA32); |
| 306 | clear_thread_flag(TIF_ABI_PENDING); |
| 307 | |
| 308 | current->mm->end_code = ex.a_text + |
| 309 | (current->mm->start_code = N_TXTADDR(ex)); |
| 310 | current->mm->end_data = ex.a_data + |
| 311 | (current->mm->start_data = N_DATADDR(ex)); |
| 312 | current->mm->brk = ex.a_bss + |
| 313 | (current->mm->start_brk = N_BSSADDR(ex)); |
| 314 | current->mm->free_area_cache = TASK_UNMAPPED_BASE; |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 315 | current->mm->cached_hole_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | set_mm_counter(current->mm, rss, 0); |
| 318 | current->mm->mmap = NULL; |
| 319 | compute_creds(bprm); |
| 320 | current->flags &= ~PF_FORKNOEXEC; |
| 321 | |
| 322 | if (N_MAGIC(ex) == OMAGIC) { |
| 323 | unsigned long text_addr, map_size; |
| 324 | loff_t pos; |
| 325 | |
| 326 | text_addr = N_TXTADDR(ex); |
| 327 | |
| 328 | pos = 32; |
| 329 | map_size = ex.a_text+ex.a_data; |
| 330 | |
| 331 | down_write(¤t->mm->mmap_sem); |
| 332 | error = do_brk(text_addr & PAGE_MASK, map_size); |
| 333 | up_write(¤t->mm->mmap_sem); |
| 334 | |
| 335 | if (error != (text_addr & PAGE_MASK)) { |
| 336 | send_sig(SIGKILL, current, 0); |
| 337 | return error; |
| 338 | } |
| 339 | |
| 340 | error = bprm->file->f_op->read(bprm->file, (char *)text_addr, |
| 341 | ex.a_text+ex.a_data, &pos); |
| 342 | if ((signed long)error < 0) { |
| 343 | send_sig(SIGKILL, current, 0); |
| 344 | return error; |
| 345 | } |
| 346 | |
| 347 | flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data); |
| 348 | } else { |
| 349 | #ifdef WARN_OLD |
| 350 | static unsigned long error_time, error_time2; |
| 351 | if ((ex.a_text & 0xfff || ex.a_data & 0xfff) && |
| 352 | (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ) |
| 353 | { |
| 354 | printk(KERN_NOTICE "executable not page aligned\n"); |
| 355 | error_time2 = jiffies; |
| 356 | } |
| 357 | |
| 358 | if ((fd_offset & ~PAGE_MASK) != 0 && |
| 359 | (jiffies-error_time) > 5*HZ) |
| 360 | { |
| 361 | printk(KERN_WARNING |
| 362 | "fd_offset is not page aligned. Please convert program: %s\n", |
| 363 | bprm->file->f_dentry->d_name.name); |
| 364 | error_time = jiffies; |
| 365 | } |
| 366 | #endif |
| 367 | |
| 368 | if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) { |
| 369 | loff_t pos = fd_offset; |
| 370 | down_write(¤t->mm->mmap_sem); |
| 371 | do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data); |
| 372 | up_write(¤t->mm->mmap_sem); |
| 373 | bprm->file->f_op->read(bprm->file,(char *)N_TXTADDR(ex), |
| 374 | ex.a_text+ex.a_data, &pos); |
| 375 | flush_icache_range((unsigned long) N_TXTADDR(ex), |
| 376 | (unsigned long) N_TXTADDR(ex) + |
| 377 | ex.a_text+ex.a_data); |
| 378 | goto beyond_if; |
| 379 | } |
| 380 | |
| 381 | down_write(¤t->mm->mmap_sem); |
| 382 | error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text, |
| 383 | PROT_READ | PROT_EXEC, |
| 384 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE | MAP_32BIT, |
| 385 | fd_offset); |
| 386 | up_write(¤t->mm->mmap_sem); |
| 387 | |
| 388 | if (error != N_TXTADDR(ex)) { |
| 389 | send_sig(SIGKILL, current, 0); |
| 390 | return error; |
| 391 | } |
| 392 | |
| 393 | down_write(¤t->mm->mmap_sem); |
| 394 | error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data, |
| 395 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 396 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE | MAP_32BIT, |
| 397 | fd_offset + ex.a_text); |
| 398 | up_write(¤t->mm->mmap_sem); |
| 399 | if (error != N_DATADDR(ex)) { |
| 400 | send_sig(SIGKILL, current, 0); |
| 401 | return error; |
| 402 | } |
| 403 | } |
| 404 | beyond_if: |
| 405 | set_binfmt(&aout_format); |
| 406 | |
| 407 | set_brk(current->mm->start_brk, current->mm->brk); |
| 408 | |
| 409 | retval = ia32_setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT); |
| 410 | if (retval < 0) { |
| 411 | /* Someone check-me: is this error path enough? */ |
| 412 | send_sig(SIGKILL, current, 0); |
| 413 | return retval; |
| 414 | } |
| 415 | |
| 416 | current->mm->start_stack = |
| 417 | (unsigned long)create_aout_tables((char __user *)bprm->p, bprm); |
| 418 | /* start thread */ |
| 419 | asm volatile("movl %0,%%fs" :: "r" (0)); \ |
| 420 | asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS)); |
| 421 | load_gs_index(0); |
| 422 | (regs)->rip = ex.a_entry; |
| 423 | (regs)->rsp = current->mm->start_stack; |
| 424 | (regs)->eflags = 0x200; |
| 425 | (regs)->cs = __USER32_CS; |
| 426 | (regs)->ss = __USER32_DS; |
| 427 | set_fs(USER_DS); |
| 428 | if (unlikely(current->ptrace & PT_PTRACED)) { |
| 429 | if (current->ptrace & PT_TRACE_EXEC) |
| 430 | ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP); |
| 431 | else |
| 432 | send_sig(SIGTRAP, current, 0); |
| 433 | } |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | static int load_aout_library(struct file *file) |
| 438 | { |
| 439 | struct inode * inode; |
| 440 | unsigned long bss, start_addr, len; |
| 441 | unsigned long error; |
| 442 | int retval; |
| 443 | struct exec ex; |
| 444 | |
| 445 | inode = file->f_dentry->d_inode; |
| 446 | |
| 447 | retval = -ENOEXEC; |
| 448 | error = kernel_read(file, 0, (char *) &ex, sizeof(ex)); |
| 449 | if (error != sizeof(ex)) |
| 450 | goto out; |
| 451 | |
| 452 | /* We come in here for the regular a.out style of shared libraries */ |
| 453 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) || |
| 454 | N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) || |
| 455 | i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { |
| 456 | goto out; |
| 457 | } |
| 458 | |
| 459 | if (N_FLAGS(ex)) |
| 460 | goto out; |
| 461 | |
| 462 | /* For QMAGIC, the starting address is 0x20 into the page. We mask |
| 463 | this off to get the starting address for the page */ |
| 464 | |
| 465 | start_addr = ex.a_entry & 0xfffff000; |
| 466 | |
| 467 | if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) { |
| 468 | loff_t pos = N_TXTOFF(ex); |
| 469 | |
| 470 | #ifdef WARN_OLD |
| 471 | static unsigned long error_time; |
| 472 | if ((jiffies-error_time) > 5*HZ) |
| 473 | { |
| 474 | printk(KERN_WARNING |
| 475 | "N_TXTOFF is not page aligned. Please convert library: %s\n", |
| 476 | file->f_dentry->d_name.name); |
| 477 | error_time = jiffies; |
| 478 | } |
| 479 | #endif |
| 480 | down_write(¤t->mm->mmap_sem); |
| 481 | do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss); |
| 482 | up_write(¤t->mm->mmap_sem); |
| 483 | |
| 484 | file->f_op->read(file, (char *)start_addr, |
| 485 | ex.a_text + ex.a_data, &pos); |
| 486 | flush_icache_range((unsigned long) start_addr, |
| 487 | (unsigned long) start_addr + ex.a_text + ex.a_data); |
| 488 | |
| 489 | retval = 0; |
| 490 | goto out; |
| 491 | } |
| 492 | /* Now use mmap to map the library into memory. */ |
| 493 | down_write(¤t->mm->mmap_sem); |
| 494 | error = do_mmap(file, start_addr, ex.a_text + ex.a_data, |
| 495 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 496 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT, |
| 497 | N_TXTOFF(ex)); |
| 498 | up_write(¤t->mm->mmap_sem); |
| 499 | retval = error; |
| 500 | if (error != start_addr) |
| 501 | goto out; |
| 502 | |
| 503 | len = PAGE_ALIGN(ex.a_text + ex.a_data); |
| 504 | bss = ex.a_text + ex.a_data + ex.a_bss; |
| 505 | if (bss > len) { |
| 506 | down_write(¤t->mm->mmap_sem); |
| 507 | error = do_brk(start_addr + len, bss - len); |
| 508 | up_write(¤t->mm->mmap_sem); |
| 509 | retval = error; |
| 510 | if (error != start_addr + len) |
| 511 | goto out; |
| 512 | } |
| 513 | retval = 0; |
| 514 | out: |
| 515 | return retval; |
| 516 | } |
| 517 | |
| 518 | static int __init init_aout_binfmt(void) |
| 519 | { |
| 520 | return register_binfmt(&aout_format); |
| 521 | } |
| 522 | |
| 523 | static void __exit exit_aout_binfmt(void) |
| 524 | { |
| 525 | unregister_binfmt(&aout_format); |
| 526 | } |
| 527 | |
| 528 | module_init(init_aout_binfmt); |
| 529 | module_exit(exit_aout_binfmt); |
| 530 | MODULE_LICENSE("GPL"); |