Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
| 2 | * |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 3 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * Derived from binfmt_elf.c |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | |
| 15 | #include <linux/fs.h> |
| 16 | #include <linux/stat.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/mman.h> |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/signal.h> |
| 22 | #include <linux/binfmts.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/file.h> |
| 25 | #include <linux/fcntl.h> |
| 26 | #include <linux/slab.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 27 | #include <linux/pagemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/highmem.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 29 | #include <linux/highuid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/personality.h> |
| 31 | #include <linux/ptrace.h> |
| 32 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/elf.h> |
| 34 | #include <linux/elf-fdpic.h> |
| 35 | #include <linux/elfcore.h> |
| 36 | |
| 37 | #include <asm/uaccess.h> |
| 38 | #include <asm/param.h> |
| 39 | #include <asm/pgalloc.h> |
| 40 | |
| 41 | typedef char *elf_caddr_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #if 0 |
| 44 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 45 | #else |
| 46 | #define kdebug(fmt, ...) do {} while(0) |
| 47 | #endif |
| 48 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 49 | #if 0 |
| 50 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 51 | #else |
| 52 | #define kdcore(fmt, ...) do {} while(0) |
| 53 | #endif |
| 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | MODULE_LICENSE("GPL"); |
| 56 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 57 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
| 58 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
| 59 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
| 60 | struct mm_struct *, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 62 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
| 63 | struct elf_fdpic_params *, |
| 64 | struct elf_fdpic_params *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 67 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
| 68 | unsigned long *); |
| 69 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
| 70 | struct file *, |
| 71 | struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #endif |
| 73 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 74 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
| 75 | struct file *, struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 77 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
Neil Horman | 7dc0b22 | 2007-10-16 23:26:34 -0700 | [diff] [blame] | 78 | static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 79 | #endif |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static struct linux_binfmt elf_fdpic_format = { |
| 82 | .module = THIS_MODULE, |
| 83 | .load_binary = load_elf_fdpic_binary, |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 84 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| 85 | .core_dump = elf_fdpic_core_dump, |
| 86 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | .min_coredump = ELF_EXEC_PAGESIZE, |
| 88 | }; |
| 89 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 90 | static int __init init_elf_fdpic_binfmt(void) |
| 91 | { |
| 92 | return register_binfmt(&elf_fdpic_format); |
| 93 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 95 | static void __exit exit_elf_fdpic_binfmt(void) |
| 96 | { |
| 97 | unregister_binfmt(&elf_fdpic_format); |
| 98 | } |
| 99 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 100 | core_initcall(init_elf_fdpic_binfmt); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 101 | module_exit(exit_elf_fdpic_binfmt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) |
| 104 | { |
| 105 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
| 106 | return 0; |
| 107 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
| 108 | return 0; |
| 109 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) |
| 110 | return 0; |
| 111 | if (!file->f_op || !file->f_op->mmap) |
| 112 | return 0; |
| 113 | return 1; |
| 114 | } |
| 115 | |
| 116 | /*****************************************************************************/ |
| 117 | /* |
| 118 | * read the program headers table into memory |
| 119 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 120 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
| 121 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | { |
| 123 | struct elf32_phdr *phdr; |
| 124 | unsigned long size; |
| 125 | int retval, loop; |
| 126 | |
| 127 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
| 128 | return -ENOMEM; |
| 129 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
| 130 | return -ENOMEM; |
| 131 | |
| 132 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
| 133 | params->phdrs = kmalloc(size, GFP_KERNEL); |
| 134 | if (!params->phdrs) |
| 135 | return -ENOMEM; |
| 136 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 137 | retval = kernel_read(file, params->hdr.e_phoff, |
| 138 | (char *) params->phdrs, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | if (retval < 0) |
| 140 | return retval; |
| 141 | |
| 142 | /* determine stack size for this binary */ |
| 143 | phdr = params->phdrs; |
| 144 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 145 | if (phdr->p_type != PT_GNU_STACK) |
| 146 | continue; |
| 147 | |
| 148 | if (phdr->p_flags & PF_X) |
| 149 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
| 150 | else |
| 151 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
| 152 | |
| 153 | params->stack_size = phdr->p_memsz; |
| 154 | break; |
| 155 | } |
| 156 | |
| 157 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 158 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | /*****************************************************************************/ |
| 161 | /* |
| 162 | * load an fdpic binary into various bits of memory |
| 163 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 164 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
| 165 | struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | { |
| 167 | struct elf_fdpic_params exec_params, interp_params; |
| 168 | struct elf_phdr *phdr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 169 | unsigned long stack_size, entryaddr; |
| 170 | #ifndef CONFIG_MMU |
| 171 | unsigned long fullsize; |
| 172 | #endif |
| 173 | #ifdef ELF_FDPIC_PLAT_INIT |
| 174 | unsigned long dynaddr; |
| 175 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | struct file *interpreter = NULL; /* to shut gcc up */ |
| 177 | char *interpreter_name = NULL; |
| 178 | int executable_stack; |
| 179 | int retval, i; |
| 180 | |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 181 | kdebug("____ LOAD %d ____", current->pid); |
| 182 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | memset(&exec_params, 0, sizeof(exec_params)); |
| 184 | memset(&interp_params, 0, sizeof(interp_params)); |
| 185 | |
| 186 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
| 187 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
| 188 | |
| 189 | /* check that this is a binary we know how to deal with */ |
| 190 | retval = -ENOEXEC; |
| 191 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) |
| 192 | goto error; |
| 193 | |
| 194 | /* read the program header table */ |
| 195 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
| 196 | if (retval < 0) |
| 197 | goto error; |
| 198 | |
| 199 | /* scan for a program header that specifies an interpreter */ |
| 200 | phdr = exec_params.phdrs; |
| 201 | |
| 202 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
| 203 | switch (phdr->p_type) { |
| 204 | case PT_INTERP: |
| 205 | retval = -ENOMEM; |
| 206 | if (phdr->p_filesz > PATH_MAX) |
| 207 | goto error; |
| 208 | retval = -ENOENT; |
| 209 | if (phdr->p_filesz < 2) |
| 210 | goto error; |
| 211 | |
| 212 | /* read the name of the interpreter into memory */ |
Jesper Juhl | 792db3a | 2006-01-09 20:54:45 -0800 | [diff] [blame] | 213 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | if (!interpreter_name) |
| 215 | goto error; |
| 216 | |
| 217 | retval = kernel_read(bprm->file, |
| 218 | phdr->p_offset, |
| 219 | interpreter_name, |
| 220 | phdr->p_filesz); |
| 221 | if (retval < 0) |
| 222 | goto error; |
| 223 | |
| 224 | retval = -ENOENT; |
| 225 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
| 226 | goto error; |
| 227 | |
| 228 | kdebug("Using ELF interpreter %s", interpreter_name); |
| 229 | |
| 230 | /* replace the program with the interpreter */ |
| 231 | interpreter = open_exec(interpreter_name); |
| 232 | retval = PTR_ERR(interpreter); |
| 233 | if (IS_ERR(interpreter)) { |
| 234 | interpreter = NULL; |
| 235 | goto error; |
| 236 | } |
| 237 | |
Alexey Dobriyan | 1fb8449 | 2007-01-26 00:57:16 -0800 | [diff] [blame] | 238 | /* |
| 239 | * If the binary is not readable then enforce |
| 240 | * mm->dumpable = 0 regardless of the interpreter's |
| 241 | * permissions. |
| 242 | */ |
| 243 | if (file_permission(interpreter, MAY_READ) < 0) |
| 244 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
| 245 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 246 | retval = kernel_read(interpreter, 0, bprm->buf, |
| 247 | BINPRM_BUF_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | if (retval < 0) |
| 249 | goto error; |
| 250 | |
| 251 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
| 252 | break; |
| 253 | |
| 254 | case PT_LOAD: |
| 255 | #ifdef CONFIG_MMU |
| 256 | if (exec_params.load_addr == 0) |
| 257 | exec_params.load_addr = phdr->p_vaddr; |
| 258 | #endif |
| 259 | break; |
| 260 | } |
| 261 | |
| 262 | } |
| 263 | |
| 264 | if (elf_check_const_displacement(&exec_params.hdr)) |
| 265 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 266 | |
| 267 | /* perform insanity checks on the interpreter */ |
| 268 | if (interpreter_name) { |
| 269 | retval = -ELIBBAD; |
| 270 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) |
| 271 | goto error; |
| 272 | |
| 273 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
| 274 | |
| 275 | /* read the interpreter's program header table */ |
| 276 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
| 277 | if (retval < 0) |
| 278 | goto error; |
| 279 | } |
| 280 | |
| 281 | stack_size = exec_params.stack_size; |
| 282 | if (stack_size < interp_params.stack_size) |
| 283 | stack_size = interp_params.stack_size; |
| 284 | |
| 285 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 286 | executable_stack = EXSTACK_ENABLE_X; |
| 287 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 288 | executable_stack = EXSTACK_DISABLE_X; |
| 289 | else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 290 | executable_stack = EXSTACK_ENABLE_X; |
| 291 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 292 | executable_stack = EXSTACK_DISABLE_X; |
| 293 | else |
| 294 | executable_stack = EXSTACK_DEFAULT; |
| 295 | |
| 296 | retval = -ENOEXEC; |
| 297 | if (stack_size == 0) |
| 298 | goto error; |
| 299 | |
| 300 | if (elf_check_const_displacement(&interp_params.hdr)) |
| 301 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 302 | |
| 303 | /* flush all traces of the currently running executable */ |
| 304 | retval = flush_old_exec(bprm); |
| 305 | if (retval) |
| 306 | goto error; |
| 307 | |
| 308 | /* there's now no turning back... the old userspace image is dead, |
| 309 | * defunct, deceased, etc. after this point we have to exit via |
| 310 | * error_kill */ |
| 311 | set_personality(PER_LINUX_FDPIC); |
| 312 | set_binfmt(&elf_fdpic_format); |
| 313 | |
| 314 | current->mm->start_code = 0; |
| 315 | current->mm->end_code = 0; |
| 316 | current->mm->start_stack = 0; |
| 317 | current->mm->start_data = 0; |
| 318 | current->mm->end_data = 0; |
| 319 | current->mm->context.exec_fdpic_loadmap = 0; |
| 320 | current->mm->context.interp_fdpic_loadmap = 0; |
| 321 | |
| 322 | current->flags &= ~PF_FORKNOEXEC; |
| 323 | |
| 324 | #ifdef CONFIG_MMU |
| 325 | elf_fdpic_arch_lay_out_mm(&exec_params, |
| 326 | &interp_params, |
| 327 | ¤t->mm->start_stack, |
| 328 | ¤t->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 330 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
| 331 | executable_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if (retval < 0) { |
| 333 | send_sig(SIGKILL, current, 0); |
| 334 | goto error_kill; |
| 335 | } |
| 336 | #endif |
| 337 | |
| 338 | /* load the executable and interpreter into memory */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 339 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
| 340 | "executable"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | if (retval < 0) |
| 342 | goto error_kill; |
| 343 | |
| 344 | if (interpreter_name) { |
| 345 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
| 346 | current->mm, "interpreter"); |
| 347 | if (retval < 0) { |
| 348 | printk(KERN_ERR "Unable to load interpreter\n"); |
| 349 | goto error_kill; |
| 350 | } |
| 351 | |
| 352 | allow_write_access(interpreter); |
| 353 | fput(interpreter); |
| 354 | interpreter = NULL; |
| 355 | } |
| 356 | |
| 357 | #ifdef CONFIG_MMU |
| 358 | if (!current->mm->start_brk) |
| 359 | current->mm->start_brk = current->mm->end_data; |
| 360 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 361 | current->mm->brk = current->mm->start_brk = |
| 362 | PAGE_ALIGN(current->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
| 364 | #else |
| 365 | /* create a stack and brk area big enough for everyone |
| 366 | * - the brk heap starts at the bottom and works up |
| 367 | * - the stack starts at the top and works down |
| 368 | */ |
| 369 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
| 370 | if (stack_size < PAGE_SIZE * 2) |
| 371 | stack_size = PAGE_SIZE * 2; |
| 372 | |
| 373 | down_write(¤t->mm->mmap_sem); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 374 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | PROT_READ | PROT_WRITE | PROT_EXEC, |
Robert P. J. Day | e10a443 | 2007-02-10 01:42:56 -0800 | [diff] [blame] | 376 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | 0); |
| 378 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 379 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | up_write(¤t->mm->mmap_sem); |
| 381 | retval = current->mm->start_brk; |
| 382 | current->mm->start_brk = 0; |
| 383 | goto error_kill; |
| 384 | } |
| 385 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 386 | /* expand the stack mapping to use up the entire allocation granule */ |
| 387 | fullsize = ksize((char *) current->mm->start_brk); |
| 388 | if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size, |
| 389 | fullsize, 0, 0))) |
| 390 | stack_size = fullsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | up_write(¤t->mm->mmap_sem); |
| 392 | |
| 393 | current->mm->brk = current->mm->start_brk; |
| 394 | current->mm->context.end_brk = current->mm->start_brk; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 395 | current->mm->context.end_brk += |
| 396 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | current->mm->start_stack = current->mm->start_brk + stack_size; |
| 398 | #endif |
| 399 | |
| 400 | compute_creds(bprm); |
| 401 | current->flags &= ~PF_FORKNOEXEC; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 402 | if (create_elf_fdpic_tables(bprm, current->mm, |
| 403 | &exec_params, &interp_params) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | goto error_kill; |
| 405 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 406 | kdebug("- start_code %lx", current->mm->start_code); |
| 407 | kdebug("- end_code %lx", current->mm->end_code); |
| 408 | kdebug("- start_data %lx", current->mm->start_data); |
| 409 | kdebug("- end_data %lx", current->mm->end_data); |
| 410 | kdebug("- start_brk %lx", current->mm->start_brk); |
| 411 | kdebug("- brk %lx", current->mm->brk); |
| 412 | kdebug("- start_stack %lx", current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
| 414 | #ifdef ELF_FDPIC_PLAT_INIT |
| 415 | /* |
| 416 | * The ABI may specify that certain registers be set up in special |
| 417 | * ways (on i386 %edx is the address of a DT_FINI function, for |
| 418 | * example. This macro performs whatever initialization to |
| 419 | * the regs structure is required. |
| 420 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 421 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
| 422 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
| 423 | dynaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | #endif |
| 425 | |
| 426 | /* everything is now ready... get the userspace context ready to roll */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 427 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
| 428 | start_thread(regs, entryaddr, current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
| 430 | if (unlikely(current->ptrace & PT_PTRACED)) { |
| 431 | if (current->ptrace & PT_TRACE_EXEC) |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 432 | ptrace_notify((PTRACE_EVENT_EXEC << 8) | SIGTRAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | else |
| 434 | send_sig(SIGTRAP, current, 0); |
| 435 | } |
| 436 | |
| 437 | retval = 0; |
| 438 | |
| 439 | error: |
| 440 | if (interpreter) { |
| 441 | allow_write_access(interpreter); |
| 442 | fput(interpreter); |
| 443 | } |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 444 | kfree(interpreter_name); |
| 445 | kfree(exec_params.phdrs); |
| 446 | kfree(exec_params.loadmap); |
| 447 | kfree(interp_params.phdrs); |
| 448 | kfree(interp_params.loadmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | return retval; |
| 450 | |
| 451 | /* unrecoverable error - kill the process */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 452 | error_kill: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | send_sig(SIGSEGV, current, 0); |
| 454 | goto error; |
| 455 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 456 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
| 458 | /*****************************************************************************/ |
| 459 | /* |
| 460 | * present useful information to the program |
| 461 | */ |
| 462 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
| 463 | struct mm_struct *mm, |
| 464 | struct elf_fdpic_params *exec_params, |
| 465 | struct elf_fdpic_params *interp_params) |
| 466 | { |
| 467 | unsigned long sp, csp, nitems; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 468 | elf_caddr_t __user *argv, *envp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | size_t platform_len = 0, len; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 470 | char *k_platform; |
| 471 | char __user *u_platform, *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | long hwcap; |
| 473 | int loop; |
| 474 | |
| 475 | /* we're going to shovel a whole load of stuff onto the stack */ |
| 476 | #ifdef CONFIG_MMU |
| 477 | sp = bprm->p; |
| 478 | #else |
| 479 | sp = mm->start_stack; |
| 480 | |
| 481 | /* stack the program arguments and environment */ |
| 482 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) |
| 483 | return -EFAULT; |
| 484 | #endif |
| 485 | |
| 486 | /* get hold of platform and hardware capabilities masks for the machine |
| 487 | * we are running on. In some cases (Sparc), this info is impossible |
| 488 | * to get, in others (i386) it is merely difficult. |
| 489 | */ |
| 490 | hwcap = ELF_HWCAP; |
| 491 | k_platform = ELF_PLATFORM; |
David Howells | 1aeb21d | 2006-07-10 04:44:50 -0700 | [diff] [blame] | 492 | u_platform = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
| 494 | if (k_platform) { |
| 495 | platform_len = strlen(k_platform) + 1; |
| 496 | sp -= platform_len; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 497 | u_platform = (char __user *) sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
| 499 | return -EFAULT; |
| 500 | } |
| 501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | #if defined(__i386__) && defined(CONFIG_SMP) |
| 503 | /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 504 | * by the processes running on the same package. One thing we can do is |
| 505 | * to shuffle the initial stack for them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | * |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 507 | * the conditionals here are unneeded, but kept in to make the code |
| 508 | * behaviour the same as pre change unless we have hyperthreaded |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | * processors. This keeps Mr Marcelo Person happier but should be |
| 510 | * removed for 2.5 |
| 511 | */ |
| 512 | if (smp_num_siblings > 1) |
| 513 | sp = sp - ((current->pid % 64) << 7); |
| 514 | #endif |
| 515 | |
| 516 | sp &= ~7UL; |
| 517 | |
| 518 | /* stack the load map(s) */ |
| 519 | len = sizeof(struct elf32_fdpic_loadmap); |
| 520 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
| 521 | sp = (sp - len) & ~7UL; |
| 522 | exec_params->map_addr = sp; |
| 523 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 524 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | return -EFAULT; |
| 526 | |
| 527 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
| 528 | |
| 529 | if (interp_params->loadmap) { |
| 530 | len = sizeof(struct elf32_fdpic_loadmap); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 531 | len += sizeof(struct elf32_fdpic_loadseg) * |
| 532 | interp_params->loadmap->nsegs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | sp = (sp - len) & ~7UL; |
| 534 | interp_params->map_addr = sp; |
| 535 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 536 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
| 537 | len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | return -EFAULT; |
| 539 | |
| 540 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
| 541 | } |
| 542 | |
| 543 | /* force 16 byte _final_ alignment here for generality */ |
| 544 | #define DLINFO_ITEMS 13 |
| 545 | |
| 546 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0); |
| 547 | #ifdef DLINFO_ARCH_ITEMS |
| 548 | nitems += DLINFO_ARCH_ITEMS; |
| 549 | #endif |
| 550 | |
| 551 | csp = sp; |
| 552 | sp -= nitems * 2 * sizeof(unsigned long); |
| 553 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
| 554 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
| 555 | sp -= 1 * sizeof(unsigned long); /* argc */ |
| 556 | |
| 557 | csp -= sp & 15UL; |
| 558 | sp -= sp & 15UL; |
| 559 | |
| 560 | /* put the ELF interpreter info on the stack */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 561 | #define NEW_AUX_ENT(nr, id, val) \ |
| 562 | do { \ |
| 563 | struct { unsigned long _id, _val; } __user *ent; \ |
| 564 | \ |
| 565 | ent = (void __user *) csp; \ |
| 566 | __put_user((id), &ent[nr]._id); \ |
| 567 | __put_user((val), &ent[nr]._val); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | } while (0) |
| 569 | |
| 570 | csp -= 2 * sizeof(unsigned long); |
| 571 | NEW_AUX_ENT(0, AT_NULL, 0); |
| 572 | if (k_platform) { |
| 573 | csp -= 2 * sizeof(unsigned long); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 574 | NEW_AUX_ENT(0, AT_PLATFORM, |
| 575 | (elf_addr_t) (unsigned long) u_platform); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 579 | NEW_AUX_ENT( 0, AT_HWCAP, hwcap); |
| 580 | NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE); |
| 581 | NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC); |
| 582 | NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr); |
| 583 | NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr)); |
| 584 | NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum); |
| 585 | NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr); |
| 586 | NEW_AUX_ENT( 7, AT_FLAGS, 0); |
| 587 | NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr); |
| 588 | NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid); |
| 589 | NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid); |
| 590 | NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid); |
| 591 | NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | |
| 593 | #ifdef ARCH_DLINFO |
| 594 | /* ARCH_DLINFO must come last so platform specific code can enforce |
| 595 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
| 596 | */ |
| 597 | ARCH_DLINFO; |
| 598 | #endif |
| 599 | #undef NEW_AUX_ENT |
| 600 | |
| 601 | /* allocate room for argv[] and envv[] */ |
| 602 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 603 | envp = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 605 | argv = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | /* stack argc */ |
| 608 | csp -= sizeof(unsigned long); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 609 | __put_user(bprm->argc, (unsigned long __user *) csp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Eric Sesterhenn | 88bcd51 | 2006-03-24 18:38:48 +0100 | [diff] [blame] | 611 | BUG_ON(csp != sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
| 613 | /* fill in the argv[] array */ |
| 614 | #ifdef CONFIG_MMU |
| 615 | current->mm->arg_start = bprm->p; |
| 616 | #else |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 617 | current->mm->arg_start = current->mm->start_stack - |
| 618 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | #endif |
| 620 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 621 | p = (char __user *) current->mm->arg_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | for (loop = bprm->argc; loop > 0; loop--) { |
| 623 | __put_user((elf_caddr_t) p, argv++); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 624 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 625 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | return -EINVAL; |
| 627 | p += len; |
| 628 | } |
| 629 | __put_user(NULL, argv); |
| 630 | current->mm->arg_end = (unsigned long) p; |
| 631 | |
| 632 | /* fill in the envv[] array */ |
| 633 | current->mm->env_start = (unsigned long) p; |
| 634 | for (loop = bprm->envc; loop > 0; loop--) { |
| 635 | __put_user((elf_caddr_t)(unsigned long) p, envp++); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 636 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 637 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | return -EINVAL; |
| 639 | p += len; |
| 640 | } |
| 641 | __put_user(NULL, envp); |
| 642 | current->mm->env_end = (unsigned long) p; |
| 643 | |
| 644 | mm->start_stack = (unsigned long) sp; |
| 645 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 646 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | |
| 648 | /*****************************************************************************/ |
| 649 | /* |
| 650 | * transfer the program arguments and environment from the holding pages onto |
| 651 | * the stack |
| 652 | */ |
| 653 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 654 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
| 655 | unsigned long *_sp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | { |
| 657 | unsigned long index, stop, sp; |
| 658 | char *src; |
| 659 | int ret = 0; |
| 660 | |
| 661 | stop = bprm->p >> PAGE_SHIFT; |
| 662 | sp = *_sp; |
| 663 | |
| 664 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { |
| 665 | src = kmap(bprm->page[index]); |
| 666 | sp -= PAGE_SIZE; |
| 667 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) |
| 668 | ret = -EFAULT; |
| 669 | kunmap(bprm->page[index]); |
| 670 | if (ret < 0) |
| 671 | goto out; |
| 672 | } |
| 673 | |
| 674 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; |
| 675 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 676 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | return ret; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 678 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | #endif |
| 680 | |
| 681 | /*****************************************************************************/ |
| 682 | /* |
| 683 | * load the appropriate binary image (executable or interpreter) into memory |
| 684 | * - we assume no MMU is available |
| 685 | * - if no other PIC bits are set in params->hdr->e_flags |
| 686 | * - we assume that the LOADable segments in the binary are independently relocatable |
| 687 | * - we assume R/O executable segments are shareable |
| 688 | * - else |
| 689 | * - we assume the loadable parts of the image to require fixed displacement |
| 690 | * - the image is not shareable |
| 691 | */ |
| 692 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
| 693 | struct file *file, |
| 694 | struct mm_struct *mm, |
| 695 | const char *what) |
| 696 | { |
| 697 | struct elf32_fdpic_loadmap *loadmap; |
| 698 | #ifdef CONFIG_MMU |
| 699 | struct elf32_fdpic_loadseg *mseg; |
| 700 | #endif |
| 701 | struct elf32_fdpic_loadseg *seg; |
| 702 | struct elf32_phdr *phdr; |
| 703 | unsigned long load_addr, stop; |
| 704 | unsigned nloads, tmp; |
| 705 | size_t size; |
| 706 | int loop, ret; |
| 707 | |
| 708 | /* allocate a load map table */ |
| 709 | nloads = 0; |
| 710 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
| 711 | if (params->phdrs[loop].p_type == PT_LOAD) |
| 712 | nloads++; |
| 713 | |
| 714 | if (nloads == 0) |
| 715 | return -ELIBBAD; |
| 716 | |
| 717 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
Robert P. J. Day | b87576d | 2006-12-12 20:07:35 +0100 | [diff] [blame] | 718 | loadmap = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | if (!loadmap) |
| 720 | return -ENOMEM; |
| 721 | |
| 722 | params->loadmap = loadmap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
| 725 | loadmap->nsegs = nloads; |
| 726 | |
| 727 | load_addr = params->load_addr; |
| 728 | seg = loadmap->segs; |
| 729 | |
| 730 | /* map the requested LOADs into the memory space */ |
| 731 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 732 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 733 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 734 | #ifndef CONFIG_MMU |
| 735 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
| 736 | if (ret < 0) |
| 737 | return ret; |
| 738 | break; |
| 739 | #endif |
| 740 | default: |
| 741 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
| 742 | if (ret < 0) |
| 743 | return ret; |
| 744 | break; |
| 745 | } |
| 746 | |
| 747 | /* map the entry point */ |
| 748 | if (params->hdr.e_entry) { |
| 749 | seg = loadmap->segs; |
| 750 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 751 | if (params->hdr.e_entry >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 752 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | params->entry_addr = |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 754 | (params->hdr.e_entry - seg->p_vaddr) + |
| 755 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | break; |
| 757 | } |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | /* determine where the program header table has wound up if mapped */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 762 | stop = params->hdr.e_phoff; |
| 763 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | phdr = params->phdrs; |
| 765 | |
| 766 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 767 | if (phdr->p_type != PT_LOAD) |
| 768 | continue; |
| 769 | |
| 770 | if (phdr->p_offset > params->hdr.e_phoff || |
| 771 | phdr->p_offset + phdr->p_filesz < stop) |
| 772 | continue; |
| 773 | |
| 774 | seg = loadmap->segs; |
| 775 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 776 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 777 | phdr->p_vaddr + phdr->p_filesz <= |
| 778 | seg->p_vaddr + seg->p_memsz) { |
| 779 | params->ph_addr = |
| 780 | (phdr->p_vaddr - seg->p_vaddr) + |
| 781 | seg->addr + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | params->hdr.e_phoff - phdr->p_offset; |
| 783 | break; |
| 784 | } |
| 785 | } |
| 786 | break; |
| 787 | } |
| 788 | |
| 789 | /* determine where the dynamic section has wound up if there is one */ |
| 790 | phdr = params->phdrs; |
| 791 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 792 | if (phdr->p_type != PT_DYNAMIC) |
| 793 | continue; |
| 794 | |
| 795 | seg = loadmap->segs; |
| 796 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 797 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 798 | phdr->p_vaddr + phdr->p_memsz <= |
| 799 | seg->p_vaddr + seg->p_memsz) { |
| 800 | params->dynamic_addr = |
| 801 | (phdr->p_vaddr - seg->p_vaddr) + |
| 802 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 804 | /* check the dynamic section contains at least |
| 805 | * one item, and that the last item is a NULL |
| 806 | * entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | if (phdr->p_memsz == 0 || |
| 808 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
| 809 | goto dynamic_error; |
| 810 | |
| 811 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 812 | if (((Elf32_Dyn *) |
| 813 | params->dynamic_addr)[tmp - 1].d_tag != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | goto dynamic_error; |
| 815 | break; |
| 816 | } |
| 817 | } |
| 818 | break; |
| 819 | } |
| 820 | |
| 821 | /* now elide adjacent segments in the load map on MMU linux |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 822 | * - on uClinux the holes between may actually be filled with system |
| 823 | * stuff or stuff from other processes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | */ |
| 825 | #ifdef CONFIG_MMU |
| 826 | nloads = loadmap->nsegs; |
| 827 | mseg = loadmap->segs; |
| 828 | seg = mseg + 1; |
| 829 | for (loop = 1; loop < nloads; loop++) { |
| 830 | /* see if we have a candidate for merging */ |
| 831 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
| 832 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
| 833 | if (load_addr == (seg->addr & PAGE_MASK)) { |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 834 | mseg->p_memsz += |
| 835 | load_addr - |
| 836 | (mseg->addr + mseg->p_memsz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
| 838 | mseg->p_memsz += seg->p_memsz; |
| 839 | loadmap->nsegs--; |
| 840 | continue; |
| 841 | } |
| 842 | } |
| 843 | |
| 844 | mseg++; |
| 845 | if (mseg != seg) |
| 846 | *mseg = *seg; |
| 847 | } |
| 848 | #endif |
| 849 | |
| 850 | kdebug("Mapped Object [%s]:", what); |
| 851 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
| 852 | kdebug("- entry : %lx", params->entry_addr); |
| 853 | kdebug("- PHDR[] : %lx", params->ph_addr); |
| 854 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
| 855 | seg = loadmap->segs; |
| 856 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
| 857 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
| 858 | loop, |
| 859 | seg->addr, seg->addr + seg->p_memsz - 1, |
| 860 | seg->p_vaddr, seg->p_memsz); |
| 861 | |
| 862 | return 0; |
| 863 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 864 | dynamic_error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 866 | what, file->f_path.dentry->d_inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return -ELIBBAD; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
| 870 | /*****************************************************************************/ |
| 871 | /* |
| 872 | * map a file with constant displacement under uClinux |
| 873 | */ |
| 874 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 875 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
| 876 | struct elf_fdpic_params *params, |
| 877 | struct file *file, |
| 878 | struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | { |
| 880 | struct elf32_fdpic_loadseg *seg; |
| 881 | struct elf32_phdr *phdr; |
| 882 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; |
| 883 | loff_t fpos; |
| 884 | int loop, ret; |
| 885 | |
| 886 | load_addr = params->load_addr; |
| 887 | seg = params->loadmap->segs; |
| 888 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 889 | /* determine the bounds of the contiguous overall allocation we must |
| 890 | * make */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | phdr = params->phdrs; |
| 892 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 893 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 894 | continue; |
| 895 | |
| 896 | if (base > phdr->p_vaddr) |
| 897 | base = phdr->p_vaddr; |
| 898 | if (top < phdr->p_vaddr + phdr->p_memsz) |
| 899 | top = phdr->p_vaddr + phdr->p_memsz; |
| 900 | } |
| 901 | |
| 902 | /* allocate one big anon block for everything */ |
| 903 | mflags = MAP_PRIVATE; |
| 904 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
| 905 | mflags |= MAP_EXECUTABLE; |
| 906 | |
| 907 | down_write(&mm->mmap_sem); |
| 908 | maddr = do_mmap(NULL, load_addr, top - base, |
| 909 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
| 910 | up_write(&mm->mmap_sem); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 911 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | return (int) maddr; |
| 913 | |
| 914 | if (load_addr != 0) |
| 915 | load_addr += PAGE_ALIGN(top - base); |
| 916 | |
| 917 | /* and then load the file segments into it */ |
| 918 | phdr = params->phdrs; |
| 919 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 920 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 921 | continue; |
| 922 | |
| 923 | fpos = phdr->p_offset; |
| 924 | |
| 925 | seg->addr = maddr + (phdr->p_vaddr - base); |
| 926 | seg->p_vaddr = phdr->p_vaddr; |
| 927 | seg->p_memsz = phdr->p_memsz; |
| 928 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 929 | ret = file->f_op->read(file, (void *) seg->addr, |
| 930 | phdr->p_filesz, &fpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | if (ret < 0) |
| 932 | return ret; |
| 933 | |
| 934 | /* map the ELF header address if in this segment */ |
| 935 | if (phdr->p_offset == 0) |
| 936 | params->elfhdr_addr = seg->addr; |
| 937 | |
| 938 | /* clear any space allocated but not loaded */ |
| 939 | if (phdr->p_filesz < phdr->p_memsz) |
| 940 | clear_user((void *) (seg->addr + phdr->p_filesz), |
| 941 | phdr->p_memsz - phdr->p_filesz); |
| 942 | |
| 943 | if (mm) { |
| 944 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 945 | if (!mm->start_code) { |
| 946 | mm->start_code = seg->addr; |
| 947 | mm->end_code = seg->addr + |
| 948 | phdr->p_memsz; |
| 949 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 950 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | mm->start_data = seg->addr; |
| 952 | #ifndef CONFIG_MMU |
| 953 | mm->end_data = seg->addr + phdr->p_memsz; |
| 954 | #endif |
| 955 | } |
| 956 | |
| 957 | #ifdef CONFIG_MMU |
| 958 | if (seg->addr + phdr->p_memsz > mm->end_data) |
| 959 | mm->end_data = seg->addr + phdr->p_memsz; |
| 960 | #endif |
| 961 | } |
| 962 | |
| 963 | seg++; |
| 964 | } |
| 965 | |
| 966 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 967 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | #endif |
| 969 | |
| 970 | /*****************************************************************************/ |
| 971 | /* |
| 972 | * map a binary by direct mmap() of the individual PT_LOAD segments |
| 973 | */ |
| 974 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
| 975 | struct file *file, |
| 976 | struct mm_struct *mm) |
| 977 | { |
| 978 | struct elf32_fdpic_loadseg *seg; |
| 979 | struct elf32_phdr *phdr; |
| 980 | unsigned long load_addr, delta_vaddr; |
| 981 | int loop, dvset; |
| 982 | |
| 983 | load_addr = params->load_addr; |
| 984 | delta_vaddr = 0; |
| 985 | dvset = 0; |
| 986 | |
| 987 | seg = params->loadmap->segs; |
| 988 | |
| 989 | /* deal with each load segment separately */ |
| 990 | phdr = params->phdrs; |
| 991 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 992 | unsigned long maddr, disp, excess, excess1; |
| 993 | int prot = 0, flags; |
| 994 | |
| 995 | if (phdr->p_type != PT_LOAD) |
| 996 | continue; |
| 997 | |
| 998 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
| 999 | (unsigned long) phdr->p_vaddr, |
| 1000 | (unsigned long) phdr->p_offset, |
| 1001 | (unsigned long) phdr->p_filesz, |
| 1002 | (unsigned long) phdr->p_memsz); |
| 1003 | |
| 1004 | /* determine the mapping parameters */ |
| 1005 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
| 1006 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
| 1007 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
| 1008 | |
| 1009 | flags = MAP_PRIVATE | MAP_DENYWRITE; |
| 1010 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
| 1011 | flags |= MAP_EXECUTABLE; |
| 1012 | |
| 1013 | maddr = 0; |
| 1014 | |
| 1015 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 1016 | case ELF_FDPIC_FLAG_INDEPENDENT: |
| 1017 | /* PT_LOADs are independently locatable */ |
| 1018 | break; |
| 1019 | |
| 1020 | case ELF_FDPIC_FLAG_HONOURVADDR: |
| 1021 | /* the specified virtual address must be honoured */ |
| 1022 | maddr = phdr->p_vaddr; |
| 1023 | flags |= MAP_FIXED; |
| 1024 | break; |
| 1025 | |
| 1026 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 1027 | /* constant displacement |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1028 | * - can be mapped anywhere, but must be mapped as a |
| 1029 | * unit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | */ |
| 1031 | if (!dvset) { |
| 1032 | maddr = load_addr; |
| 1033 | delta_vaddr = phdr->p_vaddr; |
| 1034 | dvset = 1; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1035 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
| 1037 | flags |= MAP_FIXED; |
| 1038 | } |
| 1039 | break; |
| 1040 | |
| 1041 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 1042 | /* contiguity handled later */ |
| 1043 | break; |
| 1044 | |
| 1045 | default: |
| 1046 | BUG(); |
| 1047 | } |
| 1048 | |
| 1049 | maddr &= PAGE_MASK; |
| 1050 | |
| 1051 | /* create the mapping */ |
| 1052 | disp = phdr->p_vaddr & ~PAGE_MASK; |
| 1053 | down_write(&mm->mmap_sem); |
| 1054 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
| 1055 | phdr->p_offset - disp); |
| 1056 | up_write(&mm->mmap_sem); |
| 1057 | |
| 1058 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1059 | loop, phdr->p_memsz + disp, prot, flags, |
| 1060 | phdr->p_offset - disp, maddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1061 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1062 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | return (int) maddr; |
| 1064 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1065 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
| 1066 | ELF_FDPIC_FLAG_CONTIGUOUS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
| 1068 | |
| 1069 | seg->addr = maddr + disp; |
| 1070 | seg->p_vaddr = phdr->p_vaddr; |
| 1071 | seg->p_memsz = phdr->p_memsz; |
| 1072 | |
| 1073 | /* map the ELF header address if in this segment */ |
| 1074 | if (phdr->p_offset == 0) |
| 1075 | params->elfhdr_addr = seg->addr; |
| 1076 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1077 | /* clear the bit between beginning of mapping and beginning of |
| 1078 | * PT_LOAD */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | if (prot & PROT_WRITE && disp > 0) { |
| 1080 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 1081 | clear_user((void __user *) maddr, disp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | maddr += disp; |
| 1083 | } |
| 1084 | |
| 1085 | /* clear any space allocated but not loaded |
| 1086 | * - on uClinux we can just clear the lot |
| 1087 | * - on MMU linux we'll get a SIGBUS beyond the last page |
| 1088 | * extant in the file |
| 1089 | */ |
| 1090 | excess = phdr->p_memsz - phdr->p_filesz; |
| 1091 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
| 1092 | |
| 1093 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | if (excess > excess1) { |
| 1095 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
| 1096 | unsigned long xmaddr; |
| 1097 | |
| 1098 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
| 1099 | down_write(&mm->mmap_sem); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1100 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
| 1101 | prot, flags, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | up_write(&mm->mmap_sem); |
| 1103 | |
| 1104 | kdebug("mmap[%d] <anon>" |
| 1105 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1106 | loop, xaddr, excess - excess1, prot, flags, |
| 1107 | xmaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | |
| 1109 | if (xmaddr != xaddr) |
| 1110 | return -ENOMEM; |
| 1111 | } |
| 1112 | |
| 1113 | if (prot & PROT_WRITE && excess1 > 0) { |
| 1114 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1115 | loop, maddr + phdr->p_filesz, excess1); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1116 | clear_user((void __user *) maddr + phdr->p_filesz, |
| 1117 | excess1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | } |
| 1119 | |
| 1120 | #else |
| 1121 | if (excess > 0) { |
| 1122 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1123 | loop, maddr + phdr->p_filesz, excess); |
| 1124 | clear_user((void *) maddr + phdr->p_filesz, excess); |
| 1125 | } |
| 1126 | #endif |
| 1127 | |
| 1128 | if (mm) { |
| 1129 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 1130 | if (!mm->start_code) { |
| 1131 | mm->start_code = maddr; |
| 1132 | mm->end_code = maddr + phdr->p_memsz; |
| 1133 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1134 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | mm->start_data = maddr; |
| 1136 | mm->end_data = maddr + phdr->p_memsz; |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | seg++; |
| 1141 | } |
| 1142 | |
| 1143 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1144 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1145 | |
| 1146 | /*****************************************************************************/ |
| 1147 | /* |
| 1148 | * ELF-FDPIC core dumper |
| 1149 | * |
| 1150 | * Modelled on fs/exec.c:aout_core_dump() |
| 1151 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
| 1152 | * |
| 1153 | * Modelled on fs/binfmt_elf.c core dumper |
| 1154 | */ |
| 1155 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| 1156 | |
| 1157 | /* |
| 1158 | * These are the only things you should do on a core-file: use only these |
| 1159 | * functions to write out all the necessary info. |
| 1160 | */ |
| 1161 | static int dump_write(struct file *file, const void *addr, int nr) |
| 1162 | { |
| 1163 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; |
| 1164 | } |
| 1165 | |
| 1166 | static int dump_seek(struct file *file, loff_t off) |
| 1167 | { |
| 1168 | if (file->f_op->llseek) { |
| 1169 | if (file->f_op->llseek(file, off, SEEK_SET) != off) |
| 1170 | return 0; |
| 1171 | } else { |
| 1172 | file->f_pos = off; |
| 1173 | } |
| 1174 | return 1; |
| 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * Decide whether a segment is worth dumping; default is yes to be |
| 1179 | * sure (missing info is worse than too much; etc). |
| 1180 | * Personally I'd include everything, and use the coredump limit... |
| 1181 | * |
| 1182 | * I think we should skip something. But I am not sure how. H.J. |
| 1183 | */ |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1184 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1185 | { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1186 | int dump_ok; |
| 1187 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1188 | /* Do not dump I/O mapped devices or special mappings */ |
| 1189 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { |
| 1190 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | /* If we may not read the contents, don't allow us to dump |
| 1195 | * them either. "dump_write()" can't handle it anyway. |
| 1196 | */ |
| 1197 | if (!(vma->vm_flags & VM_READ)) { |
| 1198 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); |
| 1199 | return 0; |
| 1200 | } |
| 1201 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1202 | /* By default, dump shared memory if mapped from an anonymous file. */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1203 | if (vma->vm_flags & VM_SHARED) { |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 1204 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1205 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
| 1206 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
| 1207 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1208 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1209 | } |
| 1210 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1211 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
| 1212 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
| 1213 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1214 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1215 | } |
| 1216 | |
| 1217 | #ifdef CONFIG_MMU |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1218 | /* By default, if it hasn't been written to, don't write it out */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1219 | if (!vma->anon_vma) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1220 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
| 1221 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, |
| 1222 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1223 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1224 | } |
| 1225 | #endif |
| 1226 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1227 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
| 1228 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, |
| 1229 | dump_ok ? "yes" : "no"); |
| 1230 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1231 | } |
| 1232 | |
| 1233 | /* An ELF note in memory */ |
| 1234 | struct memelfnote |
| 1235 | { |
| 1236 | const char *name; |
| 1237 | int type; |
| 1238 | unsigned int datasz; |
| 1239 | void *data; |
| 1240 | }; |
| 1241 | |
| 1242 | static int notesize(struct memelfnote *en) |
| 1243 | { |
| 1244 | int sz; |
| 1245 | |
| 1246 | sz = sizeof(struct elf_note); |
| 1247 | sz += roundup(strlen(en->name) + 1, 4); |
| 1248 | sz += roundup(en->datasz, 4); |
| 1249 | |
| 1250 | return sz; |
| 1251 | } |
| 1252 | |
| 1253 | /* #define DEBUG */ |
| 1254 | |
| 1255 | #define DUMP_WRITE(addr, nr) \ |
| 1256 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) |
| 1257 | #define DUMP_SEEK(off) \ |
| 1258 | do { if (!dump_seek(file, (off))) return 0; } while(0) |
| 1259 | |
| 1260 | static int writenote(struct memelfnote *men, struct file *file) |
| 1261 | { |
| 1262 | struct elf_note en; |
| 1263 | |
| 1264 | en.n_namesz = strlen(men->name) + 1; |
| 1265 | en.n_descsz = men->datasz; |
| 1266 | en.n_type = men->type; |
| 1267 | |
| 1268 | DUMP_WRITE(&en, sizeof(en)); |
| 1269 | DUMP_WRITE(men->name, en.n_namesz); |
| 1270 | /* XXX - cast from long long to long to avoid need for libgcc.a */ |
| 1271 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
| 1272 | DUMP_WRITE(men->data, men->datasz); |
| 1273 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
| 1274 | |
| 1275 | return 1; |
| 1276 | } |
| 1277 | #undef DUMP_WRITE |
| 1278 | #undef DUMP_SEEK |
| 1279 | |
| 1280 | #define DUMP_WRITE(addr, nr) \ |
| 1281 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ |
| 1282 | goto end_coredump; |
| 1283 | #define DUMP_SEEK(off) \ |
| 1284 | if (!dump_seek(file, (off))) \ |
| 1285 | goto end_coredump; |
| 1286 | |
| 1287 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
| 1288 | { |
| 1289 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
| 1290 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
| 1291 | elf->e_ident[EI_DATA] = ELF_DATA; |
| 1292 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
| 1293 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
| 1294 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
| 1295 | |
| 1296 | elf->e_type = ET_CORE; |
| 1297 | elf->e_machine = ELF_ARCH; |
| 1298 | elf->e_version = EV_CURRENT; |
| 1299 | elf->e_entry = 0; |
| 1300 | elf->e_phoff = sizeof(struct elfhdr); |
| 1301 | elf->e_shoff = 0; |
| 1302 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
| 1303 | elf->e_ehsize = sizeof(struct elfhdr); |
| 1304 | elf->e_phentsize = sizeof(struct elf_phdr); |
| 1305 | elf->e_phnum = segs; |
| 1306 | elf->e_shentsize = 0; |
| 1307 | elf->e_shnum = 0; |
| 1308 | elf->e_shstrndx = 0; |
| 1309 | return; |
| 1310 | } |
| 1311 | |
| 1312 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
| 1313 | { |
| 1314 | phdr->p_type = PT_NOTE; |
| 1315 | phdr->p_offset = offset; |
| 1316 | phdr->p_vaddr = 0; |
| 1317 | phdr->p_paddr = 0; |
| 1318 | phdr->p_filesz = sz; |
| 1319 | phdr->p_memsz = 0; |
| 1320 | phdr->p_flags = 0; |
| 1321 | phdr->p_align = 0; |
| 1322 | return; |
| 1323 | } |
| 1324 | |
| 1325 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
| 1326 | unsigned int sz, void *data) |
| 1327 | { |
| 1328 | note->name = name; |
| 1329 | note->type = type; |
| 1330 | note->datasz = sz; |
| 1331 | note->data = data; |
| 1332 | return; |
| 1333 | } |
| 1334 | |
| 1335 | /* |
| 1336 | * fill up all the fields in prstatus from the given task struct, except |
| 1337 | * registers which need to be filled up seperately. |
| 1338 | */ |
| 1339 | static void fill_prstatus(struct elf_prstatus *prstatus, |
| 1340 | struct task_struct *p, long signr) |
| 1341 | { |
| 1342 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
| 1343 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
| 1344 | prstatus->pr_sighold = p->blocked.sig[0]; |
| 1345 | prstatus->pr_pid = p->pid; |
| 1346 | prstatus->pr_ppid = p->parent->pid; |
Pavel Emelianov | a47afb0 | 2007-10-18 23:39:46 -0700 | [diff] [blame] | 1347 | prstatus->pr_pgrp = task_pgrp_nr(p); |
| 1348 | prstatus->pr_sid = task_session_nr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1349 | if (thread_group_leader(p)) { |
| 1350 | /* |
| 1351 | * This is the record for the group leader. Add in the |
| 1352 | * cumulative times of previous dead threads. This total |
| 1353 | * won't include the time of each live thread whose state |
| 1354 | * is included in the core dump. The final total reported |
| 1355 | * to our parent process when it calls wait4 will include |
| 1356 | * those sums as well as the little bit more time it takes |
| 1357 | * this and each other thread to finish dying after the |
| 1358 | * core dump synchronization phase. |
| 1359 | */ |
| 1360 | cputime_to_timeval(cputime_add(p->utime, p->signal->utime), |
| 1361 | &prstatus->pr_utime); |
| 1362 | cputime_to_timeval(cputime_add(p->stime, p->signal->stime), |
| 1363 | &prstatus->pr_stime); |
| 1364 | } else { |
| 1365 | cputime_to_timeval(p->utime, &prstatus->pr_utime); |
| 1366 | cputime_to_timeval(p->stime, &prstatus->pr_stime); |
| 1367 | } |
| 1368 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); |
| 1369 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); |
| 1370 | |
| 1371 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
| 1372 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
| 1373 | } |
| 1374 | |
| 1375 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
| 1376 | struct mm_struct *mm) |
| 1377 | { |
| 1378 | unsigned int i, len; |
| 1379 | |
| 1380 | /* first copy the parameters from user space */ |
| 1381 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
| 1382 | |
| 1383 | len = mm->arg_end - mm->arg_start; |
| 1384 | if (len >= ELF_PRARGSZ) |
| 1385 | len = ELF_PRARGSZ - 1; |
| 1386 | if (copy_from_user(&psinfo->pr_psargs, |
| 1387 | (const char __user *) mm->arg_start, len)) |
| 1388 | return -EFAULT; |
| 1389 | for (i = 0; i < len; i++) |
| 1390 | if (psinfo->pr_psargs[i] == 0) |
| 1391 | psinfo->pr_psargs[i] = ' '; |
| 1392 | psinfo->pr_psargs[len] = 0; |
| 1393 | |
| 1394 | psinfo->pr_pid = p->pid; |
| 1395 | psinfo->pr_ppid = p->parent->pid; |
Pavel Emelianov | a47afb0 | 2007-10-18 23:39:46 -0700 | [diff] [blame] | 1396 | psinfo->pr_pgrp = task_pgrp_nr(p); |
| 1397 | psinfo->pr_sid = task_session_nr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1398 | |
| 1399 | i = p->state ? ffz(~p->state) + 1 : 0; |
| 1400 | psinfo->pr_state = i; |
| 1401 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
| 1402 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
| 1403 | psinfo->pr_nice = task_nice(p); |
| 1404 | psinfo->pr_flag = p->flags; |
| 1405 | SET_UID(psinfo->pr_uid, p->uid); |
| 1406 | SET_GID(psinfo->pr_gid, p->gid); |
| 1407 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
| 1408 | |
| 1409 | return 0; |
| 1410 | } |
| 1411 | |
| 1412 | /* Here is the structure in which status of each thread is captured. */ |
| 1413 | struct elf_thread_status |
| 1414 | { |
| 1415 | struct list_head list; |
| 1416 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
| 1417 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
| 1418 | struct task_struct *thread; |
| 1419 | #ifdef ELF_CORE_COPY_XFPREGS |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1420 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1421 | #endif |
| 1422 | struct memelfnote notes[3]; |
| 1423 | int num_notes; |
| 1424 | }; |
| 1425 | |
| 1426 | /* |
| 1427 | * In order to add the specific thread information for the elf file format, |
| 1428 | * we need to keep a linked list of every thread's pr_status and then create |
| 1429 | * a single section for them in the final core file. |
| 1430 | */ |
| 1431 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
| 1432 | { |
| 1433 | struct task_struct *p = t->thread; |
| 1434 | int sz = 0; |
| 1435 | |
| 1436 | t->num_notes = 0; |
| 1437 | |
| 1438 | fill_prstatus(&t->prstatus, p, signr); |
| 1439 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
| 1440 | |
| 1441 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
| 1442 | &t->prstatus); |
| 1443 | t->num_notes++; |
| 1444 | sz += notesize(&t->notes[0]); |
| 1445 | |
| 1446 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); |
| 1447 | if (t->prstatus.pr_fpvalid) { |
| 1448 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
| 1449 | &t->fpu); |
| 1450 | t->num_notes++; |
| 1451 | sz += notesize(&t->notes[1]); |
| 1452 | } |
| 1453 | |
| 1454 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1455 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1456 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
| 1457 | sizeof(t->xfpu), &t->xfpu); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1458 | t->num_notes++; |
| 1459 | sz += notesize(&t->notes[2]); |
| 1460 | } |
| 1461 | #endif |
| 1462 | return sz; |
| 1463 | } |
| 1464 | |
| 1465 | /* |
| 1466 | * dump the segments for an MMU process |
| 1467 | */ |
| 1468 | #ifdef CONFIG_MMU |
Kawai, Hidehiro | e2e0090 | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1469 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1470 | unsigned long *limit, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1471 | { |
| 1472 | struct vm_area_struct *vma; |
| 1473 | |
| 1474 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
| 1475 | unsigned long addr; |
| 1476 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1477 | if (!maydump(vma, mm_flags)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1478 | continue; |
| 1479 | |
| 1480 | for (addr = vma->vm_start; |
| 1481 | addr < vma->vm_end; |
| 1482 | addr += PAGE_SIZE |
| 1483 | ) { |
| 1484 | struct vm_area_struct *vma; |
| 1485 | struct page *page; |
| 1486 | |
| 1487 | if (get_user_pages(current, current->mm, addr, 1, 0, 1, |
| 1488 | &page, &vma) <= 0) { |
| 1489 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
| 1490 | } |
Nick Piggin | 557ed1f | 2007-10-16 01:24:40 -0700 | [diff] [blame] | 1491 | else if (page == ZERO_PAGE(0)) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1492 | page_cache_release(page); |
Brian Pomerantz | 0322170 | 2007-04-01 23:49:41 -0700 | [diff] [blame] | 1493 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1494 | } |
| 1495 | else { |
| 1496 | void *kaddr; |
| 1497 | |
| 1498 | flush_cache_page(vma, addr, page_to_pfn(page)); |
| 1499 | kaddr = kmap(page); |
| 1500 | if ((*size += PAGE_SIZE) > *limit || |
| 1501 | !dump_write(file, kaddr, PAGE_SIZE) |
| 1502 | ) { |
| 1503 | kunmap(page); |
| 1504 | page_cache_release(page); |
| 1505 | return -EIO; |
| 1506 | } |
| 1507 | kunmap(page); |
| 1508 | page_cache_release(page); |
| 1509 | } |
| 1510 | } |
| 1511 | } |
| 1512 | |
| 1513 | return 0; |
| 1514 | |
| 1515 | end_coredump: |
| 1516 | return -EFBIG; |
| 1517 | } |
| 1518 | #endif |
| 1519 | |
| 1520 | /* |
| 1521 | * dump the segments for a NOMMU process |
| 1522 | */ |
| 1523 | #ifndef CONFIG_MMU |
Kawai, Hidehiro | e2e0090 | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1524 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1525 | unsigned long *limit, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1526 | { |
| 1527 | struct vm_list_struct *vml; |
| 1528 | |
| 1529 | for (vml = current->mm->context.vmlist; vml; vml = vml->next) { |
| 1530 | struct vm_area_struct *vma = vml->vma; |
| 1531 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1532 | if (!maydump(vma, mm_flags)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1533 | continue; |
| 1534 | |
| 1535 | if ((*size += PAGE_SIZE) > *limit) |
| 1536 | return -EFBIG; |
| 1537 | |
| 1538 | if (!dump_write(file, (void *) vma->vm_start, |
| 1539 | vma->vm_end - vma->vm_start)) |
| 1540 | return -EIO; |
| 1541 | } |
| 1542 | |
| 1543 | return 0; |
| 1544 | } |
| 1545 | #endif |
| 1546 | |
| 1547 | /* |
| 1548 | * Actual dumper |
| 1549 | * |
| 1550 | * This is a two-pass process; first we find the offsets of the bits, |
| 1551 | * and then they are actually written out. If we run out of core limit |
| 1552 | * we just truncate. |
| 1553 | */ |
| 1554 | static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, |
Neil Horman | 7dc0b22 | 2007-10-16 23:26:34 -0700 | [diff] [blame] | 1555 | struct file *file, unsigned long limit) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1556 | { |
| 1557 | #define NUM_NOTES 6 |
| 1558 | int has_dumped = 0; |
| 1559 | mm_segment_t fs; |
| 1560 | int segs; |
| 1561 | size_t size = 0; |
| 1562 | int i; |
| 1563 | struct vm_area_struct *vma; |
| 1564 | struct elfhdr *elf = NULL; |
| 1565 | loff_t offset = 0, dataoff; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1566 | int numnote; |
| 1567 | struct memelfnote *notes = NULL; |
| 1568 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
| 1569 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
| 1570 | struct task_struct *g, *p; |
| 1571 | LIST_HEAD(thread_list); |
| 1572 | struct list_head *t; |
| 1573 | elf_fpregset_t *fpu = NULL; |
| 1574 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1575 | elf_fpxregset_t *xfpu = NULL; |
| 1576 | #endif |
| 1577 | int thread_status_size = 0; |
| 1578 | #ifndef CONFIG_MMU |
| 1579 | struct vm_list_struct *vml; |
| 1580 | #endif |
| 1581 | elf_addr_t *auxv; |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1582 | unsigned long mm_flags; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1583 | |
| 1584 | /* |
| 1585 | * We no longer stop all VM operations. |
| 1586 | * |
| 1587 | * This is because those proceses that could possibly change map_count |
| 1588 | * or the mmap / vma pages are now blocked in do_exit on current |
| 1589 | * finishing this core dump. |
| 1590 | * |
| 1591 | * Only ptrace can touch these memory addresses, but it doesn't change |
| 1592 | * the map_count or the pages allocated. So no possibility of crashing |
| 1593 | * exists while dumping the mm->vm_next areas to the core file. |
| 1594 | */ |
| 1595 | |
| 1596 | /* alloc memory for large data structures: too large to be on stack */ |
| 1597 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
| 1598 | if (!elf) |
| 1599 | goto cleanup; |
| 1600 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); |
| 1601 | if (!prstatus) |
| 1602 | goto cleanup; |
| 1603 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
| 1604 | if (!psinfo) |
| 1605 | goto cleanup; |
| 1606 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
| 1607 | if (!notes) |
| 1608 | goto cleanup; |
| 1609 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
| 1610 | if (!fpu) |
| 1611 | goto cleanup; |
| 1612 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1613 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
| 1614 | if (!xfpu) |
| 1615 | goto cleanup; |
| 1616 | #endif |
| 1617 | |
| 1618 | if (signr) { |
| 1619 | struct elf_thread_status *tmp; |
Oleg Nesterov | bce9a23 | 2006-09-29 02:00:25 -0700 | [diff] [blame] | 1620 | rcu_read_lock(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1621 | do_each_thread(g,p) |
| 1622 | if (current->mm == p->mm && current != p) { |
| 1623 | tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC); |
| 1624 | if (!tmp) { |
Oleg Nesterov | bce9a23 | 2006-09-29 02:00:25 -0700 | [diff] [blame] | 1625 | rcu_read_unlock(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1626 | goto cleanup; |
| 1627 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1628 | tmp->thread = p; |
| 1629 | list_add(&tmp->list, &thread_list); |
| 1630 | } |
| 1631 | while_each_thread(g,p); |
Oleg Nesterov | bce9a23 | 2006-09-29 02:00:25 -0700 | [diff] [blame] | 1632 | rcu_read_unlock(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1633 | list_for_each(t, &thread_list) { |
| 1634 | struct elf_thread_status *tmp; |
| 1635 | int sz; |
| 1636 | |
| 1637 | tmp = list_entry(t, struct elf_thread_status, list); |
| 1638 | sz = elf_dump_thread_status(signr, tmp); |
| 1639 | thread_status_size += sz; |
| 1640 | } |
| 1641 | } |
| 1642 | |
| 1643 | /* now collect the dump for the current */ |
| 1644 | fill_prstatus(prstatus, current, signr); |
| 1645 | elf_core_copy_regs(&prstatus->pr_reg, regs); |
| 1646 | |
| 1647 | #ifdef CONFIG_MMU |
| 1648 | segs = current->mm->map_count; |
| 1649 | #else |
| 1650 | segs = 0; |
| 1651 | for (vml = current->mm->context.vmlist; vml; vml = vml->next) |
| 1652 | segs++; |
| 1653 | #endif |
| 1654 | #ifdef ELF_CORE_EXTRA_PHDRS |
| 1655 | segs += ELF_CORE_EXTRA_PHDRS; |
| 1656 | #endif |
| 1657 | |
| 1658 | /* Set up header */ |
| 1659 | fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ |
| 1660 | |
| 1661 | has_dumped = 1; |
| 1662 | current->flags |= PF_DUMPCORE; |
| 1663 | |
| 1664 | /* |
| 1665 | * Set up the notes in similar form to SVR4 core dumps made |
| 1666 | * with info from their /proc. |
| 1667 | */ |
| 1668 | |
| 1669 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
| 1670 | fill_psinfo(psinfo, current->group_leader, current->mm); |
| 1671 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
| 1672 | |
| 1673 | numnote = 2; |
| 1674 | |
| 1675 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
| 1676 | |
| 1677 | i = 0; |
| 1678 | do |
| 1679 | i += 2; |
| 1680 | while (auxv[i - 2] != AT_NULL); |
| 1681 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
| 1682 | i * sizeof(elf_addr_t), auxv); |
| 1683 | |
| 1684 | /* Try to dump the FPU. */ |
| 1685 | if ((prstatus->pr_fpvalid = |
| 1686 | elf_core_copy_task_fpregs(current, regs, fpu))) |
| 1687 | fill_note(notes + numnote++, |
| 1688 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
| 1689 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1690 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
| 1691 | fill_note(notes + numnote++, |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1692 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1693 | #endif |
| 1694 | |
| 1695 | fs = get_fs(); |
| 1696 | set_fs(KERNEL_DS); |
| 1697 | |
| 1698 | DUMP_WRITE(elf, sizeof(*elf)); |
| 1699 | offset += sizeof(*elf); /* Elf header */ |
| 1700 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ |
| 1701 | |
| 1702 | /* Write notes phdr entry */ |
| 1703 | { |
| 1704 | struct elf_phdr phdr; |
| 1705 | int sz = 0; |
| 1706 | |
| 1707 | for (i = 0; i < numnote; i++) |
| 1708 | sz += notesize(notes + i); |
| 1709 | |
| 1710 | sz += thread_status_size; |
| 1711 | |
| 1712 | fill_elf_note_phdr(&phdr, sz, offset); |
| 1713 | offset += sz; |
| 1714 | DUMP_WRITE(&phdr, sizeof(phdr)); |
| 1715 | } |
| 1716 | |
| 1717 | /* Page-align dumped data */ |
| 1718 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
| 1719 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1720 | /* |
| 1721 | * We must use the same mm->flags while dumping core to avoid |
| 1722 | * inconsistency between the program headers and bodies, otherwise an |
| 1723 | * unusable core file can be generated. |
| 1724 | */ |
| 1725 | mm_flags = current->mm->flags; |
| 1726 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1727 | /* write program headers for segments dump */ |
| 1728 | for ( |
| 1729 | #ifdef CONFIG_MMU |
| 1730 | vma = current->mm->mmap; vma; vma = vma->vm_next |
| 1731 | #else |
| 1732 | vml = current->mm->context.vmlist; vml; vml = vml->next |
| 1733 | #endif |
| 1734 | ) { |
| 1735 | struct elf_phdr phdr; |
| 1736 | size_t sz; |
| 1737 | |
| 1738 | #ifndef CONFIG_MMU |
| 1739 | vma = vml->vma; |
| 1740 | #endif |
| 1741 | |
| 1742 | sz = vma->vm_end - vma->vm_start; |
| 1743 | |
| 1744 | phdr.p_type = PT_LOAD; |
| 1745 | phdr.p_offset = offset; |
| 1746 | phdr.p_vaddr = vma->vm_start; |
| 1747 | phdr.p_paddr = 0; |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1748 | phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1749 | phdr.p_memsz = sz; |
| 1750 | offset += phdr.p_filesz; |
| 1751 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
| 1752 | if (vma->vm_flags & VM_WRITE) |
| 1753 | phdr.p_flags |= PF_W; |
| 1754 | if (vma->vm_flags & VM_EXEC) |
| 1755 | phdr.p_flags |= PF_X; |
| 1756 | phdr.p_align = ELF_EXEC_PAGESIZE; |
| 1757 | |
| 1758 | DUMP_WRITE(&phdr, sizeof(phdr)); |
| 1759 | } |
| 1760 | |
| 1761 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS |
| 1762 | ELF_CORE_WRITE_EXTRA_PHDRS; |
| 1763 | #endif |
| 1764 | |
| 1765 | /* write out the notes section */ |
| 1766 | for (i = 0; i < numnote; i++) |
| 1767 | if (!writenote(notes + i, file)) |
| 1768 | goto end_coredump; |
| 1769 | |
| 1770 | /* write out the thread status notes section */ |
| 1771 | list_for_each(t, &thread_list) { |
| 1772 | struct elf_thread_status *tmp = |
| 1773 | list_entry(t, struct elf_thread_status, list); |
| 1774 | |
| 1775 | for (i = 0; i < tmp->num_notes; i++) |
| 1776 | if (!writenote(&tmp->notes[i], file)) |
| 1777 | goto end_coredump; |
| 1778 | } |
| 1779 | |
| 1780 | DUMP_SEEK(dataoff); |
| 1781 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1782 | if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1783 | goto end_coredump; |
| 1784 | |
| 1785 | #ifdef ELF_CORE_WRITE_EXTRA_DATA |
| 1786 | ELF_CORE_WRITE_EXTRA_DATA; |
| 1787 | #endif |
| 1788 | |
| 1789 | if (file->f_pos != offset) { |
| 1790 | /* Sanity check */ |
| 1791 | printk(KERN_WARNING |
| 1792 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
| 1793 | file->f_pos, offset); |
| 1794 | } |
| 1795 | |
| 1796 | end_coredump: |
| 1797 | set_fs(fs); |
| 1798 | |
| 1799 | cleanup: |
| 1800 | while (!list_empty(&thread_list)) { |
| 1801 | struct list_head *tmp = thread_list.next; |
| 1802 | list_del(tmp); |
| 1803 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
| 1804 | } |
| 1805 | |
| 1806 | kfree(elf); |
| 1807 | kfree(prstatus); |
| 1808 | kfree(psinfo); |
| 1809 | kfree(notes); |
| 1810 | kfree(fpu); |
| 1811 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1812 | kfree(xfpu); |
| 1813 | #endif |
| 1814 | return has_dumped; |
| 1815 | #undef NUM_NOTES |
| 1816 | } |
| 1817 | |
| 1818 | #endif /* USE_ELF_CORE_DUMP */ |