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> |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 28 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/highmem.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 30 | #include <linux/highuid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/personality.h> |
| 32 | #include <linux/ptrace.h> |
| 33 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/elf.h> |
| 35 | #include <linux/elf-fdpic.h> |
| 36 | #include <linux/elfcore.h> |
| 37 | |
| 38 | #include <asm/uaccess.h> |
| 39 | #include <asm/param.h> |
| 40 | #include <asm/pgalloc.h> |
| 41 | |
| 42 | typedef char *elf_caddr_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | #if 0 |
| 45 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 46 | #else |
| 47 | #define kdebug(fmt, ...) do {} while(0) |
| 48 | #endif |
| 49 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 50 | #if 0 |
| 51 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 52 | #else |
| 53 | #define kdcore(fmt, ...) do {} while(0) |
| 54 | #endif |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | MODULE_LICENSE("GPL"); |
| 57 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 58 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
| 59 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
| 60 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
| 61 | struct mm_struct *, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 63 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
| 64 | struct elf_fdpic_params *, |
| 65 | struct elf_fdpic_params *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 68 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
| 69 | unsigned long *); |
| 70 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
| 71 | struct file *, |
| 72 | struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | #endif |
| 74 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 75 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
| 76 | struct file *, struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 78 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
Neil Horman | 7dc0b22 | 2007-10-16 23:26:34 -0700 | [diff] [blame] | 79 | 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] | 80 | #endif |
| 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | static struct linux_binfmt elf_fdpic_format = { |
| 83 | .module = THIS_MODULE, |
| 84 | .load_binary = load_elf_fdpic_binary, |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 85 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| 86 | .core_dump = elf_fdpic_core_dump, |
| 87 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | .min_coredump = ELF_EXEC_PAGESIZE, |
| 89 | }; |
| 90 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 91 | static int __init init_elf_fdpic_binfmt(void) |
| 92 | { |
| 93 | return register_binfmt(&elf_fdpic_format); |
| 94 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 96 | static void __exit exit_elf_fdpic_binfmt(void) |
| 97 | { |
| 98 | unregister_binfmt(&elf_fdpic_format); |
| 99 | } |
| 100 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 101 | core_initcall(init_elf_fdpic_binfmt); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 102 | module_exit(exit_elf_fdpic_binfmt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) |
| 105 | { |
| 106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
| 107 | return 0; |
| 108 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
| 109 | return 0; |
| 110 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) |
| 111 | return 0; |
| 112 | if (!file->f_op || !file->f_op->mmap) |
| 113 | return 0; |
| 114 | return 1; |
| 115 | } |
| 116 | |
| 117 | /*****************************************************************************/ |
| 118 | /* |
| 119 | * read the program headers table into memory |
| 120 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 121 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
| 122 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
| 124 | struct elf32_phdr *phdr; |
| 125 | unsigned long size; |
| 126 | int retval, loop; |
| 127 | |
| 128 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
| 129 | return -ENOMEM; |
| 130 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
| 131 | return -ENOMEM; |
| 132 | |
| 133 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
| 134 | params->phdrs = kmalloc(size, GFP_KERNEL); |
| 135 | if (!params->phdrs) |
| 136 | return -ENOMEM; |
| 137 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 138 | retval = kernel_read(file, params->hdr.e_phoff, |
| 139 | (char *) params->phdrs, size); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 140 | if (unlikely(retval != size)) |
| 141 | return retval < 0 ? retval : -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | /* determine stack size for this binary */ |
| 144 | phdr = params->phdrs; |
| 145 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 146 | if (phdr->p_type != PT_GNU_STACK) |
| 147 | continue; |
| 148 | |
| 149 | if (phdr->p_flags & PF_X) |
| 150 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
| 151 | else |
| 152 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
| 153 | |
| 154 | params->stack_size = phdr->p_memsz; |
| 155 | break; |
| 156 | } |
| 157 | |
| 158 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 159 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | /*****************************************************************************/ |
| 162 | /* |
| 163 | * load an fdpic binary into various bits of memory |
| 164 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 165 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
| 166 | struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | { |
| 168 | struct elf_fdpic_params exec_params, interp_params; |
| 169 | struct elf_phdr *phdr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 170 | unsigned long stack_size, entryaddr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 171 | #ifdef ELF_FDPIC_PLAT_INIT |
| 172 | unsigned long dynaddr; |
| 173 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | struct file *interpreter = NULL; /* to shut gcc up */ |
| 175 | char *interpreter_name = NULL; |
| 176 | int executable_stack; |
| 177 | int retval, i; |
| 178 | |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 179 | kdebug("____ LOAD %d ____", current->pid); |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | memset(&exec_params, 0, sizeof(exec_params)); |
| 182 | memset(&interp_params, 0, sizeof(interp_params)); |
| 183 | |
| 184 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
| 185 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
| 186 | |
| 187 | /* check that this is a binary we know how to deal with */ |
| 188 | retval = -ENOEXEC; |
| 189 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) |
| 190 | goto error; |
| 191 | |
| 192 | /* read the program header table */ |
| 193 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
| 194 | if (retval < 0) |
| 195 | goto error; |
| 196 | |
| 197 | /* scan for a program header that specifies an interpreter */ |
| 198 | phdr = exec_params.phdrs; |
| 199 | |
| 200 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
| 201 | switch (phdr->p_type) { |
| 202 | case PT_INTERP: |
| 203 | retval = -ENOMEM; |
| 204 | if (phdr->p_filesz > PATH_MAX) |
| 205 | goto error; |
| 206 | retval = -ENOENT; |
| 207 | if (phdr->p_filesz < 2) |
| 208 | goto error; |
| 209 | |
| 210 | /* read the name of the interpreter into memory */ |
Jesper Juhl | 792db3a | 2006-01-09 20:54:45 -0800 | [diff] [blame] | 211 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | if (!interpreter_name) |
| 213 | goto error; |
| 214 | |
| 215 | retval = kernel_read(bprm->file, |
| 216 | phdr->p_offset, |
| 217 | interpreter_name, |
| 218 | phdr->p_filesz); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 219 | if (unlikely(retval != phdr->p_filesz)) { |
| 220 | if (retval >= 0) |
| 221 | retval = -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | goto error; |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 223 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | retval = -ENOENT; |
| 226 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
| 227 | goto error; |
| 228 | |
| 229 | kdebug("Using ELF interpreter %s", interpreter_name); |
| 230 | |
| 231 | /* replace the program with the interpreter */ |
| 232 | interpreter = open_exec(interpreter_name); |
| 233 | retval = PTR_ERR(interpreter); |
| 234 | if (IS_ERR(interpreter)) { |
| 235 | interpreter = NULL; |
| 236 | goto error; |
| 237 | } |
| 238 | |
Alexey Dobriyan | 1fb8449 | 2007-01-26 00:57:16 -0800 | [diff] [blame] | 239 | /* |
| 240 | * If the binary is not readable then enforce |
| 241 | * mm->dumpable = 0 regardless of the interpreter's |
| 242 | * permissions. |
| 243 | */ |
| 244 | if (file_permission(interpreter, MAY_READ) < 0) |
| 245 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
| 246 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 247 | retval = kernel_read(interpreter, 0, bprm->buf, |
| 248 | BINPRM_BUF_SIZE); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 249 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
| 250 | if (retval >= 0) |
| 251 | retval = -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | goto error; |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 253 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
| 256 | break; |
| 257 | |
| 258 | case PT_LOAD: |
| 259 | #ifdef CONFIG_MMU |
| 260 | if (exec_params.load_addr == 0) |
| 261 | exec_params.load_addr = phdr->p_vaddr; |
| 262 | #endif |
| 263 | break; |
| 264 | } |
| 265 | |
| 266 | } |
| 267 | |
| 268 | if (elf_check_const_displacement(&exec_params.hdr)) |
| 269 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 270 | |
| 271 | /* perform insanity checks on the interpreter */ |
| 272 | if (interpreter_name) { |
| 273 | retval = -ELIBBAD; |
| 274 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) |
| 275 | goto error; |
| 276 | |
| 277 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
| 278 | |
| 279 | /* read the interpreter's program header table */ |
| 280 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
| 281 | if (retval < 0) |
| 282 | goto error; |
| 283 | } |
| 284 | |
| 285 | stack_size = exec_params.stack_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 287 | executable_stack = EXSTACK_ENABLE_X; |
| 288 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 289 | executable_stack = EXSTACK_DISABLE_X; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | else |
| 291 | executable_stack = EXSTACK_DEFAULT; |
| 292 | |
David Howells | 8e8b63a | 2009-09-23 15:57:06 -0700 | [diff] [blame] | 293 | if (stack_size == 0) { |
| 294 | stack_size = interp_params.stack_size; |
| 295 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 296 | executable_stack = EXSTACK_ENABLE_X; |
| 297 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 298 | executable_stack = EXSTACK_DISABLE_X; |
| 299 | else |
| 300 | executable_stack = EXSTACK_DEFAULT; |
| 301 | } |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | retval = -ENOEXEC; |
| 304 | if (stack_size == 0) |
| 305 | goto error; |
| 306 | |
| 307 | if (elf_check_const_displacement(&interp_params.hdr)) |
| 308 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 309 | |
| 310 | /* flush all traces of the currently running executable */ |
| 311 | retval = flush_old_exec(bprm); |
| 312 | if (retval) |
| 313 | goto error; |
| 314 | |
| 315 | /* there's now no turning back... the old userspace image is dead, |
| 316 | * defunct, deceased, etc. after this point we have to exit via |
| 317 | * error_kill */ |
| 318 | set_personality(PER_LINUX_FDPIC); |
| 319 | set_binfmt(&elf_fdpic_format); |
| 320 | |
| 321 | current->mm->start_code = 0; |
| 322 | current->mm->end_code = 0; |
| 323 | current->mm->start_stack = 0; |
| 324 | current->mm->start_data = 0; |
| 325 | current->mm->end_data = 0; |
| 326 | current->mm->context.exec_fdpic_loadmap = 0; |
| 327 | current->mm->context.interp_fdpic_loadmap = 0; |
| 328 | |
| 329 | current->flags &= ~PF_FORKNOEXEC; |
| 330 | |
| 331 | #ifdef CONFIG_MMU |
| 332 | elf_fdpic_arch_lay_out_mm(&exec_params, |
| 333 | &interp_params, |
| 334 | ¤t->mm->start_stack, |
| 335 | ¤t->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 337 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
| 338 | executable_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | if (retval < 0) { |
| 340 | send_sig(SIGKILL, current, 0); |
| 341 | goto error_kill; |
| 342 | } |
| 343 | #endif |
| 344 | |
| 345 | /* load the executable and interpreter into memory */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 346 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
| 347 | "executable"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | if (retval < 0) |
| 349 | goto error_kill; |
| 350 | |
| 351 | if (interpreter_name) { |
| 352 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
| 353 | current->mm, "interpreter"); |
| 354 | if (retval < 0) { |
| 355 | printk(KERN_ERR "Unable to load interpreter\n"); |
| 356 | goto error_kill; |
| 357 | } |
| 358 | |
| 359 | allow_write_access(interpreter); |
| 360 | fput(interpreter); |
| 361 | interpreter = NULL; |
| 362 | } |
| 363 | |
| 364 | #ifdef CONFIG_MMU |
| 365 | if (!current->mm->start_brk) |
| 366 | current->mm->start_brk = current->mm->end_data; |
| 367 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 368 | current->mm->brk = current->mm->start_brk = |
| 369 | PAGE_ALIGN(current->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | #else |
| 372 | /* create a stack and brk area big enough for everyone |
| 373 | * - the brk heap starts at the bottom and works up |
| 374 | * - the stack starts at the top and works down |
| 375 | */ |
| 376 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
| 377 | if (stack_size < PAGE_SIZE * 2) |
| 378 | stack_size = PAGE_SIZE * 2; |
| 379 | |
| 380 | down_write(¤t->mm->mmap_sem); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 381 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | PROT_READ | PROT_WRITE | PROT_EXEC, |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 383 | MAP_PRIVATE | MAP_ANONYMOUS | |
| 384 | MAP_UNINITIALIZED | MAP_GROWSDOWN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | 0); |
| 386 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 387 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | up_write(¤t->mm->mmap_sem); |
| 389 | retval = current->mm->start_brk; |
| 390 | current->mm->start_brk = 0; |
| 391 | goto error_kill; |
| 392 | } |
| 393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | up_write(¤t->mm->mmap_sem); |
| 395 | |
| 396 | current->mm->brk = current->mm->start_brk; |
| 397 | current->mm->context.end_brk = current->mm->start_brk; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 398 | current->mm->context.end_brk += |
| 399 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | current->mm->start_stack = current->mm->start_brk + stack_size; |
| 401 | #endif |
| 402 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 403 | install_exec_creds(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | current->flags &= ~PF_FORKNOEXEC; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 405 | if (create_elf_fdpic_tables(bprm, current->mm, |
| 406 | &exec_params, &interp_params) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | goto error_kill; |
| 408 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 409 | kdebug("- start_code %lx", current->mm->start_code); |
| 410 | kdebug("- end_code %lx", current->mm->end_code); |
| 411 | kdebug("- start_data %lx", current->mm->start_data); |
| 412 | kdebug("- end_data %lx", current->mm->end_data); |
| 413 | kdebug("- start_brk %lx", current->mm->start_brk); |
| 414 | kdebug("- brk %lx", current->mm->brk); |
| 415 | kdebug("- start_stack %lx", current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | #ifdef ELF_FDPIC_PLAT_INIT |
| 418 | /* |
| 419 | * The ABI may specify that certain registers be set up in special |
| 420 | * ways (on i386 %edx is the address of a DT_FINI function, for |
| 421 | * example. This macro performs whatever initialization to |
| 422 | * the regs structure is required. |
| 423 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 424 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
| 425 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
| 426 | dynaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | #endif |
| 428 | |
| 429 | /* everything is now ready... get the userspace context ready to roll */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 430 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
| 431 | start_thread(regs, entryaddr, current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | retval = 0; |
| 434 | |
| 435 | error: |
| 436 | if (interpreter) { |
| 437 | allow_write_access(interpreter); |
| 438 | fput(interpreter); |
| 439 | } |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 440 | kfree(interpreter_name); |
| 441 | kfree(exec_params.phdrs); |
| 442 | kfree(exec_params.loadmap); |
| 443 | kfree(interp_params.phdrs); |
| 444 | kfree(interp_params.loadmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | return retval; |
| 446 | |
| 447 | /* unrecoverable error - kill the process */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 448 | error_kill: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | send_sig(SIGSEGV, current, 0); |
| 450 | goto error; |
| 451 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 452 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
| 454 | /*****************************************************************************/ |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 455 | |
| 456 | #ifndef ELF_BASE_PLATFORM |
| 457 | /* |
| 458 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
| 459 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
| 460 | * will be copied to the user stack in the same manner as AT_PLATFORM. |
| 461 | */ |
| 462 | #define ELF_BASE_PLATFORM NULL |
| 463 | #endif |
| 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | /* |
Paul Mundt | c763794 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 466 | * present useful information to the program by shovelling it onto the new |
| 467 | * process's stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | */ |
| 469 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
| 470 | struct mm_struct *mm, |
| 471 | struct elf_fdpic_params *exec_params, |
| 472 | struct elf_fdpic_params *interp_params) |
| 473 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 474 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | unsigned long sp, csp, nitems; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 476 | elf_caddr_t __user *argv, *envp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | size_t platform_len = 0, len; |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 478 | char *k_platform, *k_base_platform; |
| 479 | char __user *u_platform, *u_base_platform, *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | long hwcap; |
| 481 | int loop; |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 482 | int nr; /* reset for each csp adjustment */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | #ifdef CONFIG_MMU |
Paul Mundt | c763794 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 485 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
| 486 | * by the processes running on the same package. One thing we can do is |
| 487 | * to shuffle the initial stack for them, so we give the architecture |
| 488 | * an opportunity to do so here. |
| 489 | */ |
| 490 | sp = arch_align_stack(bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | #else |
| 492 | sp = mm->start_stack; |
| 493 | |
| 494 | /* stack the program arguments and environment */ |
| 495 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) |
| 496 | return -EFAULT; |
| 497 | #endif |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | hwcap = ELF_HWCAP; |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 500 | |
| 501 | /* |
| 502 | * If this architecture has a platform capability string, copy it |
| 503 | * to userspace. In some cases (Sparc), this info is impossible |
| 504 | * for userspace to get any other way, in others (i386) it is |
| 505 | * merely difficult. |
| 506 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | k_platform = ELF_PLATFORM; |
David Howells | 1aeb21d | 2006-07-10 04:44:50 -0700 | [diff] [blame] | 508 | u_platform = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
| 510 | if (k_platform) { |
| 511 | platform_len = strlen(k_platform) + 1; |
| 512 | sp -= platform_len; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 513 | u_platform = (char __user *) sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
| 515 | return -EFAULT; |
| 516 | } |
| 517 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 518 | /* |
| 519 | * If this architecture has a "base" platform capability |
| 520 | * string, copy it to userspace. |
| 521 | */ |
| 522 | k_base_platform = ELF_BASE_PLATFORM; |
| 523 | u_base_platform = NULL; |
| 524 | |
| 525 | if (k_base_platform) { |
| 526 | platform_len = strlen(k_base_platform) + 1; |
| 527 | sp -= platform_len; |
| 528 | u_base_platform = (char __user *) sp; |
| 529 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
| 530 | return -EFAULT; |
| 531 | } |
| 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | sp &= ~7UL; |
| 534 | |
| 535 | /* stack the load map(s) */ |
| 536 | len = sizeof(struct elf32_fdpic_loadmap); |
| 537 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
| 538 | sp = (sp - len) & ~7UL; |
| 539 | exec_params->map_addr = sp; |
| 540 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 541 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | return -EFAULT; |
| 543 | |
| 544 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
| 545 | |
| 546 | if (interp_params->loadmap) { |
| 547 | len = sizeof(struct elf32_fdpic_loadmap); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 548 | len += sizeof(struct elf32_fdpic_loadseg) * |
| 549 | interp_params->loadmap->nsegs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | sp = (sp - len) & ~7UL; |
| 551 | interp_params->map_addr = sp; |
| 552 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 553 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
| 554 | len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | return -EFAULT; |
| 556 | |
| 557 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
| 558 | } |
| 559 | |
| 560 | /* force 16 byte _final_ alignment here for generality */ |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 561 | #define DLINFO_ITEMS 15 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 563 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
| 564 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 566 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
| 567 | nitems++; |
| 568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | csp = sp; |
| 570 | sp -= nitems * 2 * sizeof(unsigned long); |
| 571 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
| 572 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
| 573 | sp -= 1 * sizeof(unsigned long); /* argc */ |
| 574 | |
| 575 | csp -= sp & 15UL; |
| 576 | sp -= sp & 15UL; |
| 577 | |
| 578 | /* put the ELF interpreter info on the stack */ |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 579 | #define NEW_AUX_ENT(id, val) \ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 580 | do { \ |
| 581 | struct { unsigned long _id, _val; } __user *ent; \ |
| 582 | \ |
| 583 | ent = (void __user *) csp; \ |
| 584 | __put_user((id), &ent[nr]._id); \ |
| 585 | __put_user((val), &ent[nr]._val); \ |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 586 | nr++; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | } while (0) |
| 588 | |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 589 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | csp -= 2 * sizeof(unsigned long); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 591 | NEW_AUX_ENT(AT_NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | if (k_platform) { |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 593 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | csp -= 2 * sizeof(unsigned long); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 595 | NEW_AUX_ENT(AT_PLATFORM, |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 596 | (elf_addr_t) (unsigned long) u_platform); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | } |
| 598 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 599 | if (k_base_platform) { |
| 600 | nr = 0; |
| 601 | csp -= 2 * sizeof(unsigned long); |
| 602 | NEW_AUX_ENT(AT_BASE_PLATFORM, |
| 603 | (elf_addr_t) (unsigned long) u_base_platform); |
| 604 | } |
| 605 | |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 606 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
| 607 | nr = 0; |
| 608 | csp -= 2 * sizeof(unsigned long); |
| 609 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
| 610 | } |
| 611 | |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 612 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 614 | NEW_AUX_ENT(AT_HWCAP, hwcap); |
| 615 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
| 616 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
| 617 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
| 618 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
| 619 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
| 620 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
| 621 | NEW_AUX_ENT(AT_FLAGS, 0); |
| 622 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 623 | NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid); |
| 624 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid); |
| 625 | NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid); |
| 626 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid); |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 627 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
| 628 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | #ifdef ARCH_DLINFO |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 631 | nr = 0; |
| 632 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /* ARCH_DLINFO must come last so platform specific code can enforce |
| 635 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
| 636 | */ |
| 637 | ARCH_DLINFO; |
| 638 | #endif |
| 639 | #undef NEW_AUX_ENT |
| 640 | |
| 641 | /* allocate room for argv[] and envv[] */ |
| 642 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 643 | envp = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 645 | argv = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | |
| 647 | /* stack argc */ |
| 648 | csp -= sizeof(unsigned long); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 649 | __put_user(bprm->argc, (unsigned long __user *) csp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
Eric Sesterhenn | 88bcd51 | 2006-03-24 18:38:48 +0100 | [diff] [blame] | 651 | BUG_ON(csp != sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
| 653 | /* fill in the argv[] array */ |
| 654 | #ifdef CONFIG_MMU |
| 655 | current->mm->arg_start = bprm->p; |
| 656 | #else |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 657 | current->mm->arg_start = current->mm->start_stack - |
| 658 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | #endif |
| 660 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 661 | p = (char __user *) current->mm->arg_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | for (loop = bprm->argc; loop > 0; loop--) { |
| 663 | __put_user((elf_caddr_t) p, argv++); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 664 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 665 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | return -EINVAL; |
| 667 | p += len; |
| 668 | } |
| 669 | __put_user(NULL, argv); |
| 670 | current->mm->arg_end = (unsigned long) p; |
| 671 | |
| 672 | /* fill in the envv[] array */ |
| 673 | current->mm->env_start = (unsigned long) p; |
| 674 | for (loop = bprm->envc; loop > 0; loop--) { |
| 675 | __put_user((elf_caddr_t)(unsigned long) p, envp++); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 676 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 677 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | return -EINVAL; |
| 679 | p += len; |
| 680 | } |
| 681 | __put_user(NULL, envp); |
| 682 | current->mm->env_end = (unsigned long) p; |
| 683 | |
| 684 | mm->start_stack = (unsigned long) sp; |
| 685 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 686 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | /*****************************************************************************/ |
| 689 | /* |
| 690 | * transfer the program arguments and environment from the holding pages onto |
| 691 | * the stack |
| 692 | */ |
| 693 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 694 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
| 695 | unsigned long *_sp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | { |
| 697 | unsigned long index, stop, sp; |
| 698 | char *src; |
| 699 | int ret = 0; |
| 700 | |
| 701 | stop = bprm->p >> PAGE_SHIFT; |
| 702 | sp = *_sp; |
| 703 | |
| 704 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { |
| 705 | src = kmap(bprm->page[index]); |
| 706 | sp -= PAGE_SIZE; |
| 707 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) |
| 708 | ret = -EFAULT; |
| 709 | kunmap(bprm->page[index]); |
| 710 | if (ret < 0) |
| 711 | goto out; |
| 712 | } |
| 713 | |
| 714 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; |
| 715 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 716 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | return ret; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 718 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | #endif |
| 720 | |
| 721 | /*****************************************************************************/ |
| 722 | /* |
| 723 | * load the appropriate binary image (executable or interpreter) into memory |
| 724 | * - we assume no MMU is available |
| 725 | * - if no other PIC bits are set in params->hdr->e_flags |
| 726 | * - we assume that the LOADable segments in the binary are independently relocatable |
| 727 | * - we assume R/O executable segments are shareable |
| 728 | * - else |
| 729 | * - we assume the loadable parts of the image to require fixed displacement |
| 730 | * - the image is not shareable |
| 731 | */ |
| 732 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
| 733 | struct file *file, |
| 734 | struct mm_struct *mm, |
| 735 | const char *what) |
| 736 | { |
| 737 | struct elf32_fdpic_loadmap *loadmap; |
| 738 | #ifdef CONFIG_MMU |
| 739 | struct elf32_fdpic_loadseg *mseg; |
| 740 | #endif |
| 741 | struct elf32_fdpic_loadseg *seg; |
| 742 | struct elf32_phdr *phdr; |
| 743 | unsigned long load_addr, stop; |
| 744 | unsigned nloads, tmp; |
| 745 | size_t size; |
| 746 | int loop, ret; |
| 747 | |
| 748 | /* allocate a load map table */ |
| 749 | nloads = 0; |
| 750 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
| 751 | if (params->phdrs[loop].p_type == PT_LOAD) |
| 752 | nloads++; |
| 753 | |
| 754 | if (nloads == 0) |
| 755 | return -ELIBBAD; |
| 756 | |
| 757 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
Robert P. J. Day | b87576d | 2006-12-12 20:07:35 +0100 | [diff] [blame] | 758 | loadmap = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if (!loadmap) |
| 760 | return -ENOMEM; |
| 761 | |
| 762 | params->loadmap = loadmap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | |
| 764 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
| 765 | loadmap->nsegs = nloads; |
| 766 | |
| 767 | load_addr = params->load_addr; |
| 768 | seg = loadmap->segs; |
| 769 | |
| 770 | /* map the requested LOADs into the memory space */ |
| 771 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 772 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 773 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 774 | #ifndef CONFIG_MMU |
| 775 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
| 776 | if (ret < 0) |
| 777 | return ret; |
| 778 | break; |
| 779 | #endif |
| 780 | default: |
| 781 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
| 782 | if (ret < 0) |
| 783 | return ret; |
| 784 | break; |
| 785 | } |
| 786 | |
| 787 | /* map the entry point */ |
| 788 | if (params->hdr.e_entry) { |
| 789 | seg = loadmap->segs; |
| 790 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 791 | if (params->hdr.e_entry >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 792 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | params->entry_addr = |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 794 | (params->hdr.e_entry - seg->p_vaddr) + |
| 795 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | break; |
| 797 | } |
| 798 | } |
| 799 | } |
| 800 | |
| 801 | /* determine where the program header table has wound up if mapped */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 802 | stop = params->hdr.e_phoff; |
| 803 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | phdr = params->phdrs; |
| 805 | |
| 806 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 807 | if (phdr->p_type != PT_LOAD) |
| 808 | continue; |
| 809 | |
| 810 | if (phdr->p_offset > params->hdr.e_phoff || |
| 811 | phdr->p_offset + phdr->p_filesz < stop) |
| 812 | continue; |
| 813 | |
| 814 | seg = loadmap->segs; |
| 815 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 816 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 817 | phdr->p_vaddr + phdr->p_filesz <= |
| 818 | seg->p_vaddr + seg->p_memsz) { |
| 819 | params->ph_addr = |
| 820 | (phdr->p_vaddr - seg->p_vaddr) + |
| 821 | seg->addr + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | params->hdr.e_phoff - phdr->p_offset; |
| 823 | break; |
| 824 | } |
| 825 | } |
| 826 | break; |
| 827 | } |
| 828 | |
| 829 | /* determine where the dynamic section has wound up if there is one */ |
| 830 | phdr = params->phdrs; |
| 831 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 832 | if (phdr->p_type != PT_DYNAMIC) |
| 833 | continue; |
| 834 | |
| 835 | seg = loadmap->segs; |
| 836 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 837 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 838 | phdr->p_vaddr + phdr->p_memsz <= |
| 839 | seg->p_vaddr + seg->p_memsz) { |
| 840 | params->dynamic_addr = |
| 841 | (phdr->p_vaddr - seg->p_vaddr) + |
| 842 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 844 | /* check the dynamic section contains at least |
| 845 | * one item, and that the last item is a NULL |
| 846 | * entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | if (phdr->p_memsz == 0 || |
| 848 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
| 849 | goto dynamic_error; |
| 850 | |
| 851 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 852 | if (((Elf32_Dyn *) |
| 853 | params->dynamic_addr)[tmp - 1].d_tag != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | goto dynamic_error; |
| 855 | break; |
| 856 | } |
| 857 | } |
| 858 | break; |
| 859 | } |
| 860 | |
| 861 | /* now elide adjacent segments in the load map on MMU linux |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 862 | * - on uClinux the holes between may actually be filled with system |
| 863 | * stuff or stuff from other processes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | */ |
| 865 | #ifdef CONFIG_MMU |
| 866 | nloads = loadmap->nsegs; |
| 867 | mseg = loadmap->segs; |
| 868 | seg = mseg + 1; |
| 869 | for (loop = 1; loop < nloads; loop++) { |
| 870 | /* see if we have a candidate for merging */ |
| 871 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
| 872 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
| 873 | if (load_addr == (seg->addr & PAGE_MASK)) { |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 874 | mseg->p_memsz += |
| 875 | load_addr - |
| 876 | (mseg->addr + mseg->p_memsz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
| 878 | mseg->p_memsz += seg->p_memsz; |
| 879 | loadmap->nsegs--; |
| 880 | continue; |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | mseg++; |
| 885 | if (mseg != seg) |
| 886 | *mseg = *seg; |
| 887 | } |
| 888 | #endif |
| 889 | |
| 890 | kdebug("Mapped Object [%s]:", what); |
| 891 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
| 892 | kdebug("- entry : %lx", params->entry_addr); |
| 893 | kdebug("- PHDR[] : %lx", params->ph_addr); |
| 894 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
| 895 | seg = loadmap->segs; |
| 896 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
| 897 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
| 898 | loop, |
| 899 | seg->addr, seg->addr + seg->p_memsz - 1, |
| 900 | seg->p_vaddr, seg->p_memsz); |
| 901 | |
| 902 | return 0; |
| 903 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 904 | dynamic_error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 906 | what, file->f_path.dentry->d_inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | return -ELIBBAD; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 908 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | |
| 910 | /*****************************************************************************/ |
| 911 | /* |
| 912 | * map a file with constant displacement under uClinux |
| 913 | */ |
| 914 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 915 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
| 916 | struct elf_fdpic_params *params, |
| 917 | struct file *file, |
| 918 | struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | { |
| 920 | struct elf32_fdpic_loadseg *seg; |
| 921 | struct elf32_phdr *phdr; |
| 922 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; |
| 923 | loff_t fpos; |
| 924 | int loop, ret; |
| 925 | |
| 926 | load_addr = params->load_addr; |
| 927 | seg = params->loadmap->segs; |
| 928 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 929 | /* determine the bounds of the contiguous overall allocation we must |
| 930 | * make */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | phdr = params->phdrs; |
| 932 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 933 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 934 | continue; |
| 935 | |
| 936 | if (base > phdr->p_vaddr) |
| 937 | base = phdr->p_vaddr; |
| 938 | if (top < phdr->p_vaddr + phdr->p_memsz) |
| 939 | top = phdr->p_vaddr + phdr->p_memsz; |
| 940 | } |
| 941 | |
| 942 | /* allocate one big anon block for everything */ |
| 943 | mflags = MAP_PRIVATE; |
| 944 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
| 945 | mflags |= MAP_EXECUTABLE; |
| 946 | |
| 947 | down_write(&mm->mmap_sem); |
| 948 | maddr = do_mmap(NULL, load_addr, top - base, |
| 949 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
| 950 | up_write(&mm->mmap_sem); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 951 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | return (int) maddr; |
| 953 | |
| 954 | if (load_addr != 0) |
| 955 | load_addr += PAGE_ALIGN(top - base); |
| 956 | |
| 957 | /* and then load the file segments into it */ |
| 958 | phdr = params->phdrs; |
| 959 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 960 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 961 | continue; |
| 962 | |
| 963 | fpos = phdr->p_offset; |
| 964 | |
| 965 | seg->addr = maddr + (phdr->p_vaddr - base); |
| 966 | seg->p_vaddr = phdr->p_vaddr; |
| 967 | seg->p_memsz = phdr->p_memsz; |
| 968 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 969 | ret = file->f_op->read(file, (void *) seg->addr, |
| 970 | phdr->p_filesz, &fpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | if (ret < 0) |
| 972 | return ret; |
| 973 | |
| 974 | /* map the ELF header address if in this segment */ |
| 975 | if (phdr->p_offset == 0) |
| 976 | params->elfhdr_addr = seg->addr; |
| 977 | |
| 978 | /* clear any space allocated but not loaded */ |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 979 | if (phdr->p_filesz < phdr->p_memsz) { |
| 980 | ret = clear_user((void *) (seg->addr + phdr->p_filesz), |
| 981 | phdr->p_memsz - phdr->p_filesz); |
| 982 | if (ret) |
| 983 | return ret; |
| 984 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | |
| 986 | if (mm) { |
| 987 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 988 | if (!mm->start_code) { |
| 989 | mm->start_code = seg->addr; |
| 990 | mm->end_code = seg->addr + |
| 991 | phdr->p_memsz; |
| 992 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 993 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | mm->start_data = seg->addr; |
| 995 | #ifndef CONFIG_MMU |
| 996 | mm->end_data = seg->addr + phdr->p_memsz; |
| 997 | #endif |
| 998 | } |
| 999 | |
| 1000 | #ifdef CONFIG_MMU |
| 1001 | if (seg->addr + phdr->p_memsz > mm->end_data) |
| 1002 | mm->end_data = seg->addr + phdr->p_memsz; |
| 1003 | #endif |
| 1004 | } |
| 1005 | |
| 1006 | seg++; |
| 1007 | } |
| 1008 | |
| 1009 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1010 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | #endif |
| 1012 | |
| 1013 | /*****************************************************************************/ |
| 1014 | /* |
| 1015 | * map a binary by direct mmap() of the individual PT_LOAD segments |
| 1016 | */ |
| 1017 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
| 1018 | struct file *file, |
| 1019 | struct mm_struct *mm) |
| 1020 | { |
| 1021 | struct elf32_fdpic_loadseg *seg; |
| 1022 | struct elf32_phdr *phdr; |
| 1023 | unsigned long load_addr, delta_vaddr; |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 1024 | int loop, dvset, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
| 1026 | load_addr = params->load_addr; |
| 1027 | delta_vaddr = 0; |
| 1028 | dvset = 0; |
| 1029 | |
| 1030 | seg = params->loadmap->segs; |
| 1031 | |
| 1032 | /* deal with each load segment separately */ |
| 1033 | phdr = params->phdrs; |
| 1034 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 1035 | unsigned long maddr, disp, excess, excess1; |
| 1036 | int prot = 0, flags; |
| 1037 | |
| 1038 | if (phdr->p_type != PT_LOAD) |
| 1039 | continue; |
| 1040 | |
| 1041 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
| 1042 | (unsigned long) phdr->p_vaddr, |
| 1043 | (unsigned long) phdr->p_offset, |
| 1044 | (unsigned long) phdr->p_filesz, |
| 1045 | (unsigned long) phdr->p_memsz); |
| 1046 | |
| 1047 | /* determine the mapping parameters */ |
| 1048 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
| 1049 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
| 1050 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
| 1051 | |
| 1052 | flags = MAP_PRIVATE | MAP_DENYWRITE; |
| 1053 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
| 1054 | flags |= MAP_EXECUTABLE; |
| 1055 | |
| 1056 | maddr = 0; |
| 1057 | |
| 1058 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 1059 | case ELF_FDPIC_FLAG_INDEPENDENT: |
| 1060 | /* PT_LOADs are independently locatable */ |
| 1061 | break; |
| 1062 | |
| 1063 | case ELF_FDPIC_FLAG_HONOURVADDR: |
| 1064 | /* the specified virtual address must be honoured */ |
| 1065 | maddr = phdr->p_vaddr; |
| 1066 | flags |= MAP_FIXED; |
| 1067 | break; |
| 1068 | |
| 1069 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 1070 | /* constant displacement |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1071 | * - can be mapped anywhere, but must be mapped as a |
| 1072 | * unit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | */ |
| 1074 | if (!dvset) { |
| 1075 | maddr = load_addr; |
| 1076 | delta_vaddr = phdr->p_vaddr; |
| 1077 | dvset = 1; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1078 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
| 1080 | flags |= MAP_FIXED; |
| 1081 | } |
| 1082 | break; |
| 1083 | |
| 1084 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 1085 | /* contiguity handled later */ |
| 1086 | break; |
| 1087 | |
| 1088 | default: |
| 1089 | BUG(); |
| 1090 | } |
| 1091 | |
| 1092 | maddr &= PAGE_MASK; |
| 1093 | |
| 1094 | /* create the mapping */ |
| 1095 | disp = phdr->p_vaddr & ~PAGE_MASK; |
| 1096 | down_write(&mm->mmap_sem); |
| 1097 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
| 1098 | phdr->p_offset - disp); |
| 1099 | up_write(&mm->mmap_sem); |
| 1100 | |
| 1101 | 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] | 1102 | loop, phdr->p_memsz + disp, prot, flags, |
| 1103 | phdr->p_offset - disp, maddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1105 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | return (int) maddr; |
| 1107 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1108 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
| 1109 | ELF_FDPIC_FLAG_CONTIGUOUS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
| 1111 | |
| 1112 | seg->addr = maddr + disp; |
| 1113 | seg->p_vaddr = phdr->p_vaddr; |
| 1114 | seg->p_memsz = phdr->p_memsz; |
| 1115 | |
| 1116 | /* map the ELF header address if in this segment */ |
| 1117 | if (phdr->p_offset == 0) |
| 1118 | params->elfhdr_addr = seg->addr; |
| 1119 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1120 | /* clear the bit between beginning of mapping and beginning of |
| 1121 | * PT_LOAD */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (prot & PROT_WRITE && disp > 0) { |
| 1123 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 1124 | ret = clear_user((void __user *) maddr, disp); |
| 1125 | if (ret) |
| 1126 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | maddr += disp; |
| 1128 | } |
| 1129 | |
| 1130 | /* clear any space allocated but not loaded |
| 1131 | * - on uClinux we can just clear the lot |
| 1132 | * - on MMU linux we'll get a SIGBUS beyond the last page |
| 1133 | * extant in the file |
| 1134 | */ |
| 1135 | excess = phdr->p_memsz - phdr->p_filesz; |
| 1136 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
| 1137 | |
| 1138 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | if (excess > excess1) { |
| 1140 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
| 1141 | unsigned long xmaddr; |
| 1142 | |
| 1143 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
| 1144 | down_write(&mm->mmap_sem); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1145 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
| 1146 | prot, flags, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | up_write(&mm->mmap_sem); |
| 1148 | |
| 1149 | kdebug("mmap[%d] <anon>" |
| 1150 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1151 | loop, xaddr, excess - excess1, prot, flags, |
| 1152 | xmaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | |
| 1154 | if (xmaddr != xaddr) |
| 1155 | return -ENOMEM; |
| 1156 | } |
| 1157 | |
| 1158 | if (prot & PROT_WRITE && excess1 > 0) { |
| 1159 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1160 | loop, maddr + phdr->p_filesz, excess1); |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 1161 | ret = clear_user((void __user *) maddr + phdr->p_filesz, |
| 1162 | excess1); |
| 1163 | if (ret) |
| 1164 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
| 1167 | #else |
| 1168 | if (excess > 0) { |
| 1169 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1170 | loop, maddr + phdr->p_filesz, excess); |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 1171 | ret = clear_user((void *) maddr + phdr->p_filesz, excess); |
| 1172 | if (ret) |
| 1173 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | } |
| 1175 | #endif |
| 1176 | |
| 1177 | if (mm) { |
| 1178 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 1179 | if (!mm->start_code) { |
| 1180 | mm->start_code = maddr; |
| 1181 | mm->end_code = maddr + phdr->p_memsz; |
| 1182 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1183 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | mm->start_data = maddr; |
| 1185 | mm->end_data = maddr + phdr->p_memsz; |
| 1186 | } |
| 1187 | } |
| 1188 | |
| 1189 | seg++; |
| 1190 | } |
| 1191 | |
| 1192 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1193 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1194 | |
| 1195 | /*****************************************************************************/ |
| 1196 | /* |
| 1197 | * ELF-FDPIC core dumper |
| 1198 | * |
| 1199 | * Modelled on fs/exec.c:aout_core_dump() |
| 1200 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
| 1201 | * |
| 1202 | * Modelled on fs/binfmt_elf.c core dumper |
| 1203 | */ |
| 1204 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
| 1205 | |
| 1206 | /* |
| 1207 | * These are the only things you should do on a core-file: use only these |
| 1208 | * functions to write out all the necessary info. |
| 1209 | */ |
| 1210 | static int dump_write(struct file *file, const void *addr, int nr) |
| 1211 | { |
| 1212 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; |
| 1213 | } |
| 1214 | |
| 1215 | static int dump_seek(struct file *file, loff_t off) |
| 1216 | { |
| 1217 | if (file->f_op->llseek) { |
| 1218 | if (file->f_op->llseek(file, off, SEEK_SET) != off) |
| 1219 | return 0; |
| 1220 | } else { |
| 1221 | file->f_pos = off; |
| 1222 | } |
| 1223 | return 1; |
| 1224 | } |
| 1225 | |
| 1226 | /* |
| 1227 | * Decide whether a segment is worth dumping; default is yes to be |
| 1228 | * sure (missing info is worse than too much; etc). |
| 1229 | * Personally I'd include everything, and use the coredump limit... |
| 1230 | * |
| 1231 | * I think we should skip something. But I am not sure how. H.J. |
| 1232 | */ |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1233 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1234 | { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1235 | int dump_ok; |
| 1236 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1237 | /* Do not dump I/O mapped devices or special mappings */ |
| 1238 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { |
| 1239 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
| 1240 | return 0; |
| 1241 | } |
| 1242 | |
| 1243 | /* If we may not read the contents, don't allow us to dump |
| 1244 | * them either. "dump_write()" can't handle it anyway. |
| 1245 | */ |
| 1246 | if (!(vma->vm_flags & VM_READ)) { |
| 1247 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); |
| 1248 | return 0; |
| 1249 | } |
| 1250 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1251 | /* By default, dump shared memory if mapped from an anonymous file. */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1252 | if (vma->vm_flags & VM_SHARED) { |
Josef "Jeff" Sipek | 0f7fc9e | 2006-12-08 02:36:35 -0800 | [diff] [blame] | 1253 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1254 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
| 1255 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
| 1256 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1257 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1258 | } |
| 1259 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1260 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
| 1261 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
| 1262 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1263 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1264 | } |
| 1265 | |
| 1266 | #ifdef CONFIG_MMU |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1267 | /* 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] | 1268 | if (!vma->anon_vma) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1269 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
| 1270 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, |
| 1271 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1272 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1273 | } |
| 1274 | #endif |
| 1275 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1276 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
| 1277 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, |
| 1278 | dump_ok ? "yes" : "no"); |
| 1279 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1280 | } |
| 1281 | |
| 1282 | /* An ELF note in memory */ |
| 1283 | struct memelfnote |
| 1284 | { |
| 1285 | const char *name; |
| 1286 | int type; |
| 1287 | unsigned int datasz; |
| 1288 | void *data; |
| 1289 | }; |
| 1290 | |
| 1291 | static int notesize(struct memelfnote *en) |
| 1292 | { |
| 1293 | int sz; |
| 1294 | |
| 1295 | sz = sizeof(struct elf_note); |
| 1296 | sz += roundup(strlen(en->name) + 1, 4); |
| 1297 | sz += roundup(en->datasz, 4); |
| 1298 | |
| 1299 | return sz; |
| 1300 | } |
| 1301 | |
| 1302 | /* #define DEBUG */ |
| 1303 | |
| 1304 | #define DUMP_WRITE(addr, nr) \ |
| 1305 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) |
| 1306 | #define DUMP_SEEK(off) \ |
| 1307 | do { if (!dump_seek(file, (off))) return 0; } while(0) |
| 1308 | |
| 1309 | static int writenote(struct memelfnote *men, struct file *file) |
| 1310 | { |
| 1311 | struct elf_note en; |
| 1312 | |
| 1313 | en.n_namesz = strlen(men->name) + 1; |
| 1314 | en.n_descsz = men->datasz; |
| 1315 | en.n_type = men->type; |
| 1316 | |
| 1317 | DUMP_WRITE(&en, sizeof(en)); |
| 1318 | DUMP_WRITE(men->name, en.n_namesz); |
| 1319 | /* XXX - cast from long long to long to avoid need for libgcc.a */ |
| 1320 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
| 1321 | DUMP_WRITE(men->data, men->datasz); |
| 1322 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
| 1323 | |
| 1324 | return 1; |
| 1325 | } |
| 1326 | #undef DUMP_WRITE |
| 1327 | #undef DUMP_SEEK |
| 1328 | |
| 1329 | #define DUMP_WRITE(addr, nr) \ |
| 1330 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ |
| 1331 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1332 | |
| 1333 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
| 1334 | { |
| 1335 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
| 1336 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
| 1337 | elf->e_ident[EI_DATA] = ELF_DATA; |
| 1338 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
| 1339 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
| 1340 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
| 1341 | |
| 1342 | elf->e_type = ET_CORE; |
| 1343 | elf->e_machine = ELF_ARCH; |
| 1344 | elf->e_version = EV_CURRENT; |
| 1345 | elf->e_entry = 0; |
| 1346 | elf->e_phoff = sizeof(struct elfhdr); |
| 1347 | elf->e_shoff = 0; |
| 1348 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
| 1349 | elf->e_ehsize = sizeof(struct elfhdr); |
| 1350 | elf->e_phentsize = sizeof(struct elf_phdr); |
| 1351 | elf->e_phnum = segs; |
| 1352 | elf->e_shentsize = 0; |
| 1353 | elf->e_shnum = 0; |
| 1354 | elf->e_shstrndx = 0; |
| 1355 | return; |
| 1356 | } |
| 1357 | |
| 1358 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
| 1359 | { |
| 1360 | phdr->p_type = PT_NOTE; |
| 1361 | phdr->p_offset = offset; |
| 1362 | phdr->p_vaddr = 0; |
| 1363 | phdr->p_paddr = 0; |
| 1364 | phdr->p_filesz = sz; |
| 1365 | phdr->p_memsz = 0; |
| 1366 | phdr->p_flags = 0; |
| 1367 | phdr->p_align = 0; |
| 1368 | return; |
| 1369 | } |
| 1370 | |
| 1371 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
| 1372 | unsigned int sz, void *data) |
| 1373 | { |
| 1374 | note->name = name; |
| 1375 | note->type = type; |
| 1376 | note->datasz = sz; |
| 1377 | note->data = data; |
| 1378 | return; |
| 1379 | } |
| 1380 | |
| 1381 | /* |
| 1382 | * fill up all the fields in prstatus from the given task struct, except |
| 1383 | * registers which need to be filled up seperately. |
| 1384 | */ |
| 1385 | static void fill_prstatus(struct elf_prstatus *prstatus, |
| 1386 | struct task_struct *p, long signr) |
| 1387 | { |
| 1388 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
| 1389 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
| 1390 | prstatus->pr_sighold = p->blocked.sig[0]; |
Oleg Nesterov | 3b34fc5 | 2009-06-17 16:27:38 -0700 | [diff] [blame] | 1391 | rcu_read_lock(); |
| 1392 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
| 1393 | rcu_read_unlock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1394 | prstatus->pr_pid = task_pid_vnr(p); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1395 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
| 1396 | prstatus->pr_sid = task_session_vnr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1397 | if (thread_group_leader(p)) { |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1398 | struct task_cputime cputime; |
| 1399 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1400 | /* |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1401 | * This is the record for the group leader. It shows the |
| 1402 | * group-wide total, not its individual thread total. |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1403 | */ |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1404 | thread_group_cputime(p, &cputime); |
| 1405 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); |
| 1406 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1407 | } else { |
| 1408 | cputime_to_timeval(p->utime, &prstatus->pr_utime); |
| 1409 | cputime_to_timeval(p->stime, &prstatus->pr_stime); |
| 1410 | } |
| 1411 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); |
| 1412 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); |
| 1413 | |
| 1414 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
| 1415 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
| 1416 | } |
| 1417 | |
| 1418 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
| 1419 | struct mm_struct *mm) |
| 1420 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1421 | const struct cred *cred; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1422 | unsigned int i, len; |
| 1423 | |
| 1424 | /* first copy the parameters from user space */ |
| 1425 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
| 1426 | |
| 1427 | len = mm->arg_end - mm->arg_start; |
| 1428 | if (len >= ELF_PRARGSZ) |
| 1429 | len = ELF_PRARGSZ - 1; |
| 1430 | if (copy_from_user(&psinfo->pr_psargs, |
| 1431 | (const char __user *) mm->arg_start, len)) |
| 1432 | return -EFAULT; |
| 1433 | for (i = 0; i < len; i++) |
| 1434 | if (psinfo->pr_psargs[i] == 0) |
| 1435 | psinfo->pr_psargs[i] = ' '; |
| 1436 | psinfo->pr_psargs[len] = 0; |
| 1437 | |
Oleg Nesterov | 3b34fc5 | 2009-06-17 16:27:38 -0700 | [diff] [blame] | 1438 | rcu_read_lock(); |
| 1439 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
| 1440 | rcu_read_unlock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1441 | psinfo->pr_pid = task_pid_vnr(p); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1442 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
| 1443 | psinfo->pr_sid = task_session_vnr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1444 | |
| 1445 | i = p->state ? ffz(~p->state) + 1 : 0; |
| 1446 | psinfo->pr_state = i; |
| 1447 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
| 1448 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
| 1449 | psinfo->pr_nice = task_nice(p); |
| 1450 | psinfo->pr_flag = p->flags; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1451 | rcu_read_lock(); |
| 1452 | cred = __task_cred(p); |
| 1453 | SET_UID(psinfo->pr_uid, cred->uid); |
| 1454 | SET_GID(psinfo->pr_gid, cred->gid); |
| 1455 | rcu_read_unlock(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1456 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
| 1457 | |
| 1458 | return 0; |
| 1459 | } |
| 1460 | |
| 1461 | /* Here is the structure in which status of each thread is captured. */ |
| 1462 | struct elf_thread_status |
| 1463 | { |
| 1464 | struct list_head list; |
| 1465 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
| 1466 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
| 1467 | struct task_struct *thread; |
| 1468 | #ifdef ELF_CORE_COPY_XFPREGS |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1469 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1470 | #endif |
| 1471 | struct memelfnote notes[3]; |
| 1472 | int num_notes; |
| 1473 | }; |
| 1474 | |
| 1475 | /* |
| 1476 | * In order to add the specific thread information for the elf file format, |
| 1477 | * we need to keep a linked list of every thread's pr_status and then create |
| 1478 | * a single section for them in the final core file. |
| 1479 | */ |
| 1480 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
| 1481 | { |
| 1482 | struct task_struct *p = t->thread; |
| 1483 | int sz = 0; |
| 1484 | |
| 1485 | t->num_notes = 0; |
| 1486 | |
| 1487 | fill_prstatus(&t->prstatus, p, signr); |
| 1488 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
| 1489 | |
| 1490 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
| 1491 | &t->prstatus); |
| 1492 | t->num_notes++; |
| 1493 | sz += notesize(&t->notes[0]); |
| 1494 | |
| 1495 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); |
| 1496 | if (t->prstatus.pr_fpvalid) { |
| 1497 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
| 1498 | &t->fpu); |
| 1499 | t->num_notes++; |
| 1500 | sz += notesize(&t->notes[1]); |
| 1501 | } |
| 1502 | |
| 1503 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1504 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1505 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
| 1506 | sizeof(t->xfpu), &t->xfpu); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1507 | t->num_notes++; |
| 1508 | sz += notesize(&t->notes[2]); |
| 1509 | } |
| 1510 | #endif |
| 1511 | return sz; |
| 1512 | } |
| 1513 | |
| 1514 | /* |
| 1515 | * dump the segments for an MMU process |
| 1516 | */ |
| 1517 | #ifdef CONFIG_MMU |
Kawai, Hidehiro | e2e0090 | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1518 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1519 | unsigned long *limit, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1520 | { |
| 1521 | struct vm_area_struct *vma; |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1522 | int err = 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1523 | |
| 1524 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
| 1525 | unsigned long addr; |
| 1526 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1527 | if (!maydump(vma, mm_flags)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1528 | continue; |
| 1529 | |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1530 | for (addr = vma->vm_start; addr < vma->vm_end; |
| 1531 | addr += PAGE_SIZE) { |
| 1532 | struct page *page = get_dump_page(addr); |
| 1533 | if (page) { |
| 1534 | void *kaddr = kmap(page); |
| 1535 | *size += PAGE_SIZE; |
| 1536 | if (*size > *limit) |
| 1537 | err = -EFBIG; |
| 1538 | else if (!dump_write(file, kaddr, PAGE_SIZE)) |
| 1539 | err = -EIO; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1540 | kunmap(page); |
| 1541 | page_cache_release(page); |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1542 | } else if (!dump_seek(file, file->f_pos + PAGE_SIZE)) |
| 1543 | err = -EFBIG; |
| 1544 | if (err) |
| 1545 | goto out; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1546 | } |
| 1547 | } |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1548 | out: |
| 1549 | return err; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1550 | } |
| 1551 | #endif |
| 1552 | |
| 1553 | /* |
| 1554 | * dump the segments for a NOMMU process |
| 1555 | */ |
| 1556 | #ifndef CONFIG_MMU |
Kawai, Hidehiro | e2e0090 | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1557 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1558 | unsigned long *limit, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1559 | { |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1560 | struct vm_area_struct *vma; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1561 | |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1562 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1563 | if (!maydump(vma, mm_flags)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1564 | continue; |
| 1565 | |
| 1566 | if ((*size += PAGE_SIZE) > *limit) |
| 1567 | return -EFBIG; |
| 1568 | |
| 1569 | if (!dump_write(file, (void *) vma->vm_start, |
| 1570 | vma->vm_end - vma->vm_start)) |
| 1571 | return -EIO; |
| 1572 | } |
| 1573 | |
| 1574 | return 0; |
| 1575 | } |
| 1576 | #endif |
| 1577 | |
| 1578 | /* |
| 1579 | * Actual dumper |
| 1580 | * |
| 1581 | * This is a two-pass process; first we find the offsets of the bits, |
| 1582 | * and then they are actually written out. If we run out of core limit |
| 1583 | * we just truncate. |
| 1584 | */ |
| 1585 | static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, |
Neil Horman | 7dc0b22 | 2007-10-16 23:26:34 -0700 | [diff] [blame] | 1586 | struct file *file, unsigned long limit) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1587 | { |
| 1588 | #define NUM_NOTES 6 |
| 1589 | int has_dumped = 0; |
| 1590 | mm_segment_t fs; |
| 1591 | int segs; |
| 1592 | size_t size = 0; |
| 1593 | int i; |
| 1594 | struct vm_area_struct *vma; |
| 1595 | struct elfhdr *elf = NULL; |
| 1596 | loff_t offset = 0, dataoff; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1597 | int numnote; |
| 1598 | struct memelfnote *notes = NULL; |
| 1599 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
| 1600 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1601 | LIST_HEAD(thread_list); |
| 1602 | struct list_head *t; |
| 1603 | elf_fpregset_t *fpu = NULL; |
| 1604 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1605 | elf_fpxregset_t *xfpu = NULL; |
| 1606 | #endif |
| 1607 | int thread_status_size = 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1608 | elf_addr_t *auxv; |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1609 | unsigned long mm_flags; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1610 | |
| 1611 | /* |
| 1612 | * We no longer stop all VM operations. |
| 1613 | * |
| 1614 | * This is because those proceses that could possibly change map_count |
| 1615 | * or the mmap / vma pages are now blocked in do_exit on current |
| 1616 | * finishing this core dump. |
| 1617 | * |
| 1618 | * Only ptrace can touch these memory addresses, but it doesn't change |
| 1619 | * the map_count or the pages allocated. So no possibility of crashing |
| 1620 | * exists while dumping the mm->vm_next areas to the core file. |
| 1621 | */ |
| 1622 | |
| 1623 | /* alloc memory for large data structures: too large to be on stack */ |
| 1624 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
| 1625 | if (!elf) |
| 1626 | goto cleanup; |
| 1627 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); |
| 1628 | if (!prstatus) |
| 1629 | goto cleanup; |
| 1630 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
| 1631 | if (!psinfo) |
| 1632 | goto cleanup; |
| 1633 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
| 1634 | if (!notes) |
| 1635 | goto cleanup; |
| 1636 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
| 1637 | if (!fpu) |
| 1638 | goto cleanup; |
| 1639 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1640 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
| 1641 | if (!xfpu) |
| 1642 | goto cleanup; |
| 1643 | #endif |
| 1644 | |
| 1645 | if (signr) { |
Oleg Nesterov | 182c515 | 2008-07-25 01:47:45 -0700 | [diff] [blame] | 1646 | struct core_thread *ct; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1647 | struct elf_thread_status *tmp; |
Oleg Nesterov | 24d5288 | 2008-07-25 01:47:40 -0700 | [diff] [blame] | 1648 | |
Oleg Nesterov | 182c515 | 2008-07-25 01:47:45 -0700 | [diff] [blame] | 1649 | for (ct = current->mm->core_state->dumper.next; |
| 1650 | ct; ct = ct->next) { |
| 1651 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
| 1652 | if (!tmp) |
| 1653 | goto cleanup; |
| 1654 | |
| 1655 | tmp->thread = ct->task; |
| 1656 | list_add(&tmp->list, &thread_list); |
| 1657 | } |
| 1658 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1659 | list_for_each(t, &thread_list) { |
| 1660 | struct elf_thread_status *tmp; |
| 1661 | int sz; |
| 1662 | |
| 1663 | tmp = list_entry(t, struct elf_thread_status, list); |
| 1664 | sz = elf_dump_thread_status(signr, tmp); |
| 1665 | thread_status_size += sz; |
| 1666 | } |
| 1667 | } |
| 1668 | |
| 1669 | /* now collect the dump for the current */ |
| 1670 | fill_prstatus(prstatus, current, signr); |
| 1671 | elf_core_copy_regs(&prstatus->pr_reg, regs); |
| 1672 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1673 | segs = current->mm->map_count; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1674 | #ifdef ELF_CORE_EXTRA_PHDRS |
| 1675 | segs += ELF_CORE_EXTRA_PHDRS; |
| 1676 | #endif |
| 1677 | |
| 1678 | /* Set up header */ |
| 1679 | fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ |
| 1680 | |
| 1681 | has_dumped = 1; |
| 1682 | current->flags |= PF_DUMPCORE; |
| 1683 | |
| 1684 | /* |
| 1685 | * Set up the notes in similar form to SVR4 core dumps made |
| 1686 | * with info from their /proc. |
| 1687 | */ |
| 1688 | |
| 1689 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
| 1690 | fill_psinfo(psinfo, current->group_leader, current->mm); |
| 1691 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
| 1692 | |
| 1693 | numnote = 2; |
| 1694 | |
| 1695 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
| 1696 | |
| 1697 | i = 0; |
| 1698 | do |
| 1699 | i += 2; |
| 1700 | while (auxv[i - 2] != AT_NULL); |
| 1701 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
| 1702 | i * sizeof(elf_addr_t), auxv); |
| 1703 | |
| 1704 | /* Try to dump the FPU. */ |
| 1705 | if ((prstatus->pr_fpvalid = |
| 1706 | elf_core_copy_task_fpregs(current, regs, fpu))) |
| 1707 | fill_note(notes + numnote++, |
| 1708 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
| 1709 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1710 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
| 1711 | fill_note(notes + numnote++, |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1712 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1713 | #endif |
| 1714 | |
| 1715 | fs = get_fs(); |
| 1716 | set_fs(KERNEL_DS); |
| 1717 | |
| 1718 | DUMP_WRITE(elf, sizeof(*elf)); |
| 1719 | offset += sizeof(*elf); /* Elf header */ |
| 1720 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ |
| 1721 | |
| 1722 | /* Write notes phdr entry */ |
| 1723 | { |
| 1724 | struct elf_phdr phdr; |
| 1725 | int sz = 0; |
| 1726 | |
| 1727 | for (i = 0; i < numnote; i++) |
| 1728 | sz += notesize(notes + i); |
| 1729 | |
| 1730 | sz += thread_status_size; |
| 1731 | |
| 1732 | fill_elf_note_phdr(&phdr, sz, offset); |
| 1733 | offset += sz; |
| 1734 | DUMP_WRITE(&phdr, sizeof(phdr)); |
| 1735 | } |
| 1736 | |
| 1737 | /* Page-align dumped data */ |
| 1738 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
| 1739 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1740 | /* |
| 1741 | * We must use the same mm->flags while dumping core to avoid |
| 1742 | * inconsistency between the program headers and bodies, otherwise an |
| 1743 | * unusable core file can be generated. |
| 1744 | */ |
| 1745 | mm_flags = current->mm->flags; |
| 1746 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1747 | /* write program headers for segments dump */ |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1748 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1749 | struct elf_phdr phdr; |
| 1750 | size_t sz; |
| 1751 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1752 | sz = vma->vm_end - vma->vm_start; |
| 1753 | |
| 1754 | phdr.p_type = PT_LOAD; |
| 1755 | phdr.p_offset = offset; |
| 1756 | phdr.p_vaddr = vma->vm_start; |
| 1757 | phdr.p_paddr = 0; |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1758 | phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1759 | phdr.p_memsz = sz; |
| 1760 | offset += phdr.p_filesz; |
| 1761 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
| 1762 | if (vma->vm_flags & VM_WRITE) |
| 1763 | phdr.p_flags |= PF_W; |
| 1764 | if (vma->vm_flags & VM_EXEC) |
| 1765 | phdr.p_flags |= PF_X; |
| 1766 | phdr.p_align = ELF_EXEC_PAGESIZE; |
| 1767 | |
| 1768 | DUMP_WRITE(&phdr, sizeof(phdr)); |
| 1769 | } |
| 1770 | |
| 1771 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS |
| 1772 | ELF_CORE_WRITE_EXTRA_PHDRS; |
| 1773 | #endif |
| 1774 | |
| 1775 | /* write out the notes section */ |
| 1776 | for (i = 0; i < numnote; i++) |
| 1777 | if (!writenote(notes + i, file)) |
| 1778 | goto end_coredump; |
| 1779 | |
| 1780 | /* write out the thread status notes section */ |
| 1781 | list_for_each(t, &thread_list) { |
| 1782 | struct elf_thread_status *tmp = |
| 1783 | list_entry(t, struct elf_thread_status, list); |
| 1784 | |
| 1785 | for (i = 0; i < tmp->num_notes; i++) |
| 1786 | if (!writenote(&tmp->notes[i], file)) |
| 1787 | goto end_coredump; |
| 1788 | } |
| 1789 | |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1790 | if (!dump_seek(file, dataoff)) |
| 1791 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1792 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1793 | if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1794 | goto end_coredump; |
| 1795 | |
| 1796 | #ifdef ELF_CORE_WRITE_EXTRA_DATA |
| 1797 | ELF_CORE_WRITE_EXTRA_DATA; |
| 1798 | #endif |
| 1799 | |
| 1800 | if (file->f_pos != offset) { |
| 1801 | /* Sanity check */ |
| 1802 | printk(KERN_WARNING |
| 1803 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
| 1804 | file->f_pos, offset); |
| 1805 | } |
| 1806 | |
| 1807 | end_coredump: |
| 1808 | set_fs(fs); |
| 1809 | |
| 1810 | cleanup: |
| 1811 | while (!list_empty(&thread_list)) { |
| 1812 | struct list_head *tmp = thread_list.next; |
| 1813 | list_del(tmp); |
| 1814 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
| 1815 | } |
| 1816 | |
| 1817 | kfree(elf); |
| 1818 | kfree(prstatus); |
| 1819 | kfree(psinfo); |
| 1820 | kfree(notes); |
| 1821 | kfree(fpu); |
| 1822 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1823 | kfree(xfpu); |
| 1824 | #endif |
| 1825 | return has_dumped; |
| 1826 | #undef NUM_NOTES |
| 1827 | } |
| 1828 | |
| 1829 | #endif /* USE_ELF_CORE_DUMP */ |