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> |
Ingo Molnar | 68db0cf | 2017-02-08 18:51:37 +0100 | [diff] [blame] | 18 | #include <linux/sched/coredump.h> |
| 19 | #include <linux/sched/task_stack.h> |
Ingo Molnar | 32ef551 | 2017-02-05 11:48:36 +0100 | [diff] [blame] | 20 | #include <linux/sched/cputime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/mm.h> |
| 22 | #include <linux/mman.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/signal.h> |
| 25 | #include <linux/binfmts.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/file.h> |
| 28 | #include <linux/fcntl.h> |
| 29 | #include <linux/slab.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 30 | #include <linux/pagemap.h> |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 31 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/highmem.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 33 | #include <linux/highuid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/personality.h> |
| 35 | #include <linux/ptrace.h> |
| 36 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/elf.h> |
| 38 | #include <linux/elf-fdpic.h> |
| 39 | #include <linux/elfcore.h> |
Daisuke HATAYAMA | 088e7af | 2010-03-05 13:44:06 -0800 | [diff] [blame] | 40 | #include <linux/coredump.h> |
Ross Zwisler | ab27a8d | 2015-10-05 16:33:37 -0600 | [diff] [blame] | 41 | #include <linux/dax.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 43 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <asm/param.h> |
| 45 | #include <asm/pgalloc.h> |
| 46 | |
| 47 | typedef char *elf_caddr_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | #if 0 |
| 50 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 51 | #else |
| 52 | #define kdebug(fmt, ...) do {} while(0) |
| 53 | #endif |
| 54 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 55 | #if 0 |
| 56 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 57 | #else |
| 58 | #define kdcore(fmt, ...) do {} while(0) |
| 59 | #endif |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | MODULE_LICENSE("GPL"); |
| 62 | |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 63 | static int load_elf_fdpic_binary(struct linux_binprm *); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 64 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
| 65 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
| 66 | struct mm_struct *, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 68 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
| 69 | struct elf_fdpic_params *, |
| 70 | struct elf_fdpic_params *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 73 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
| 74 | struct file *, |
| 75 | struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #endif |
| 77 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 78 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
| 79 | struct file *, struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 81 | #ifdef CONFIG_ELF_CORE |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 82 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 83 | #endif |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | static struct linux_binfmt elf_fdpic_format = { |
| 86 | .module = THIS_MODULE, |
| 87 | .load_binary = load_elf_fdpic_binary, |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 88 | #ifdef CONFIG_ELF_CORE |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 89 | .core_dump = elf_fdpic_core_dump, |
| 90 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | .min_coredump = ELF_EXEC_PAGESIZE, |
| 92 | }; |
| 93 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 94 | static int __init init_elf_fdpic_binfmt(void) |
| 95 | { |
Al Viro | 8fc3dc5 | 2012-03-17 03:05:16 -0400 | [diff] [blame] | 96 | register_binfmt(&elf_fdpic_format); |
| 97 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 98 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 100 | static void __exit exit_elf_fdpic_binfmt(void) |
| 101 | { |
| 102 | unregister_binfmt(&elf_fdpic_format); |
| 103 | } |
| 104 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 105 | core_initcall(init_elf_fdpic_binfmt); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 106 | module_exit(exit_elf_fdpic_binfmt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 108 | static int is_elf(struct elfhdr *hdr, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
| 110 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
| 111 | return 0; |
| 112 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
| 113 | return 0; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 114 | if (!elf_check_arch(hdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | return 0; |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 116 | if (!file->f_op->mmap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | return 0; |
| 118 | return 1; |
| 119 | } |
| 120 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 121 | #ifndef elf_check_fdpic |
| 122 | #define elf_check_fdpic(x) 0 |
| 123 | #endif |
| 124 | |
| 125 | #ifndef elf_check_const_displacement |
| 126 | #define elf_check_const_displacement(x) 0 |
| 127 | #endif |
| 128 | |
| 129 | static int is_constdisp(struct elfhdr *hdr) |
| 130 | { |
| 131 | if (!elf_check_fdpic(hdr)) |
| 132 | return 1; |
| 133 | if (elf_check_const_displacement(hdr)) |
| 134 | return 1; |
| 135 | return 0; |
| 136 | } |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | /*****************************************************************************/ |
| 139 | /* |
| 140 | * read the program headers table into memory |
| 141 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 142 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
| 143 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | { |
| 145 | struct elf32_phdr *phdr; |
| 146 | unsigned long size; |
| 147 | int retval, loop; |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame^] | 148 | loff_t pos = params->hdr.e_phoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
| 151 | return -ENOMEM; |
| 152 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
| 153 | return -ENOMEM; |
| 154 | |
| 155 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
| 156 | params->phdrs = kmalloc(size, GFP_KERNEL); |
| 157 | if (!params->phdrs) |
| 158 | return -ENOMEM; |
| 159 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame^] | 160 | retval = kernel_read(file, params->phdrs, size, &pos); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 161 | if (unlikely(retval != size)) |
| 162 | return retval < 0 ? retval : -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | |
| 164 | /* determine stack size for this binary */ |
| 165 | phdr = params->phdrs; |
| 166 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 167 | if (phdr->p_type != PT_GNU_STACK) |
| 168 | continue; |
| 169 | |
| 170 | if (phdr->p_flags & PF_X) |
| 171 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
| 172 | else |
| 173 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
| 174 | |
| 175 | params->stack_size = phdr->p_memsz; |
| 176 | break; |
| 177 | } |
| 178 | |
| 179 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | /*****************************************************************************/ |
| 183 | /* |
| 184 | * load an fdpic binary into various bits of memory |
| 185 | */ |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 186 | static int load_elf_fdpic_binary(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
| 188 | struct elf_fdpic_params exec_params, interp_params; |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 189 | struct pt_regs *regs = current_pt_regs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | struct elf_phdr *phdr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 191 | unsigned long stack_size, entryaddr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 192 | #ifdef ELF_FDPIC_PLAT_INIT |
| 193 | unsigned long dynaddr; |
| 194 | #endif |
Mike Frysinger | 04e4f2b | 2010-01-06 17:23:17 +0000 | [diff] [blame] | 195 | #ifndef CONFIG_MMU |
| 196 | unsigned long stack_prot; |
| 197 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | struct file *interpreter = NULL; /* to shut gcc up */ |
| 199 | char *interpreter_name = NULL; |
| 200 | int executable_stack; |
| 201 | int retval, i; |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame^] | 202 | loff_t pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 204 | kdebug("____ LOAD %d ____", current->pid); |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | memset(&exec_params, 0, sizeof(exec_params)); |
| 207 | memset(&interp_params, 0, sizeof(interp_params)); |
| 208 | |
| 209 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
| 210 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
| 211 | |
| 212 | /* check that this is a binary we know how to deal with */ |
| 213 | retval = -ENOEXEC; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 214 | if (!is_elf(&exec_params.hdr, bprm->file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | goto error; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 216 | if (!elf_check_fdpic(&exec_params.hdr)) { |
| 217 | #ifdef CONFIG_MMU |
| 218 | /* binfmt_elf handles non-fdpic elf except on nommu */ |
| 219 | goto error; |
| 220 | #else |
| 221 | /* nommu can only load ET_DYN (PIE) ELF */ |
| 222 | if (exec_params.hdr.e_type != ET_DYN) |
| 223 | goto error; |
| 224 | #endif |
| 225 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | /* read the program header table */ |
| 228 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
| 229 | if (retval < 0) |
| 230 | goto error; |
| 231 | |
| 232 | /* scan for a program header that specifies an interpreter */ |
| 233 | phdr = exec_params.phdrs; |
| 234 | |
| 235 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
| 236 | switch (phdr->p_type) { |
| 237 | case PT_INTERP: |
| 238 | retval = -ENOMEM; |
| 239 | if (phdr->p_filesz > PATH_MAX) |
| 240 | goto error; |
| 241 | retval = -ENOENT; |
| 242 | if (phdr->p_filesz < 2) |
| 243 | goto error; |
| 244 | |
| 245 | /* read the name of the interpreter into memory */ |
Jesper Juhl | 792db3a | 2006-01-09 20:54:45 -0800 | [diff] [blame] | 246 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | if (!interpreter_name) |
| 248 | goto error; |
| 249 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame^] | 250 | pos = phdr->p_offset; |
| 251 | retval = kernel_read(bprm->file, interpreter_name, |
| 252 | phdr->p_filesz, &pos); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 253 | if (unlikely(retval != phdr->p_filesz)) { |
| 254 | if (retval >= 0) |
| 255 | retval = -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | goto error; |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 257 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | retval = -ENOENT; |
| 260 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
| 261 | goto error; |
| 262 | |
| 263 | kdebug("Using ELF interpreter %s", interpreter_name); |
| 264 | |
| 265 | /* replace the program with the interpreter */ |
| 266 | interpreter = open_exec(interpreter_name); |
| 267 | retval = PTR_ERR(interpreter); |
| 268 | if (IS_ERR(interpreter)) { |
| 269 | interpreter = NULL; |
| 270 | goto error; |
| 271 | } |
| 272 | |
Alexey Dobriyan | 1fb8449 | 2007-01-26 00:57:16 -0800 | [diff] [blame] | 273 | /* |
| 274 | * If the binary is not readable then enforce |
| 275 | * mm->dumpable = 0 regardless of the interpreter's |
| 276 | * permissions. |
| 277 | */ |
Al Viro | 1b5d783 | 2011-06-19 12:49:47 -0400 | [diff] [blame] | 278 | would_dump(bprm, interpreter); |
Alexey Dobriyan | 1fb8449 | 2007-01-26 00:57:16 -0800 | [diff] [blame] | 279 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame^] | 280 | pos = 0; |
| 281 | retval = kernel_read(interpreter, bprm->buf, |
| 282 | BINPRM_BUF_SIZE, &pos); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 283 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
| 284 | if (retval >= 0) |
| 285 | retval = -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | goto error; |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
| 290 | break; |
| 291 | |
| 292 | case PT_LOAD: |
| 293 | #ifdef CONFIG_MMU |
| 294 | if (exec_params.load_addr == 0) |
| 295 | exec_params.load_addr = phdr->p_vaddr; |
| 296 | #endif |
| 297 | break; |
| 298 | } |
| 299 | |
| 300 | } |
| 301 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 302 | if (is_constdisp(&exec_params.hdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 304 | |
| 305 | /* perform insanity checks on the interpreter */ |
| 306 | if (interpreter_name) { |
| 307 | retval = -ELIBBAD; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 308 | if (!is_elf(&interp_params.hdr, interpreter)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | goto error; |
| 310 | |
| 311 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
| 312 | |
| 313 | /* read the interpreter's program header table */ |
| 314 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
| 315 | if (retval < 0) |
| 316 | goto error; |
| 317 | } |
| 318 | |
| 319 | stack_size = exec_params.stack_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 321 | executable_stack = EXSTACK_ENABLE_X; |
| 322 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 323 | executable_stack = EXSTACK_DISABLE_X; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | else |
| 325 | executable_stack = EXSTACK_DEFAULT; |
| 326 | |
David Howells | 8e8b63a | 2009-09-23 15:57:06 -0700 | [diff] [blame] | 327 | if (stack_size == 0) { |
| 328 | stack_size = interp_params.stack_size; |
| 329 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 330 | executable_stack = EXSTACK_ENABLE_X; |
| 331 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 332 | executable_stack = EXSTACK_DISABLE_X; |
| 333 | else |
| 334 | executable_stack = EXSTACK_DEFAULT; |
| 335 | } |
| 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | retval = -ENOEXEC; |
| 338 | if (stack_size == 0) |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 339 | stack_size = 131072UL; /* same as exec.c's default commit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 341 | if (is_constdisp(&interp_params.hdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 343 | |
| 344 | /* flush all traces of the currently running executable */ |
| 345 | retval = flush_old_exec(bprm); |
| 346 | if (retval) |
| 347 | goto error; |
| 348 | |
| 349 | /* there's now no turning back... the old userspace image is dead, |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 350 | * defunct, deceased, etc. |
| 351 | */ |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 352 | if (elf_check_fdpic(&exec_params.hdr)) |
| 353 | set_personality(PER_LINUX_FDPIC); |
| 354 | else |
| 355 | set_personality(PER_LINUX); |
Mike Frysinger | 04e4f2b | 2010-01-06 17:23:17 +0000 | [diff] [blame] | 356 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
| 357 | current->personality |= READ_IMPLIES_EXEC; |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 358 | |
| 359 | setup_new_exec(bprm); |
| 360 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | set_binfmt(&elf_fdpic_format); |
| 362 | |
| 363 | current->mm->start_code = 0; |
| 364 | current->mm->end_code = 0; |
| 365 | current->mm->start_stack = 0; |
| 366 | current->mm->start_data = 0; |
| 367 | current->mm->end_data = 0; |
| 368 | current->mm->context.exec_fdpic_loadmap = 0; |
| 369 | current->mm->context.interp_fdpic_loadmap = 0; |
| 370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | #ifdef CONFIG_MMU |
| 372 | elf_fdpic_arch_lay_out_mm(&exec_params, |
| 373 | &interp_params, |
| 374 | ¤t->mm->start_stack, |
| 375 | ¤t->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 377 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
| 378 | executable_stack); |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 379 | if (retval < 0) |
| 380 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | #endif |
| 382 | |
| 383 | /* load the executable and interpreter into memory */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 384 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
| 385 | "executable"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | if (retval < 0) |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 387 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | if (interpreter_name) { |
| 390 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
| 391 | current->mm, "interpreter"); |
| 392 | if (retval < 0) { |
| 393 | printk(KERN_ERR "Unable to load interpreter\n"); |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 394 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | allow_write_access(interpreter); |
| 398 | fput(interpreter); |
| 399 | interpreter = NULL; |
| 400 | } |
| 401 | |
| 402 | #ifdef CONFIG_MMU |
| 403 | if (!current->mm->start_brk) |
| 404 | current->mm->start_brk = current->mm->end_data; |
| 405 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 406 | current->mm->brk = current->mm->start_brk = |
| 407 | PAGE_ALIGN(current->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
| 409 | #else |
Rich Felker | 4ac3131 | 2015-08-20 15:11:06 -0400 | [diff] [blame] | 410 | /* create a stack area and zero-size brk area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
| 412 | if (stack_size < PAGE_SIZE * 2) |
| 413 | stack_size = PAGE_SIZE * 2; |
| 414 | |
Mike Frysinger | 04e4f2b | 2010-01-06 17:23:17 +0000 | [diff] [blame] | 415 | stack_prot = PROT_READ | PROT_WRITE; |
| 416 | if (executable_stack == EXSTACK_ENABLE_X || |
| 417 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) |
| 418 | stack_prot |= PROT_EXEC; |
| 419 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 420 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 421 | MAP_PRIVATE | MAP_ANONYMOUS | |
| 422 | MAP_UNINITIALIZED | MAP_GROWSDOWN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | 0); |
| 424 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 425 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | retval = current->mm->start_brk; |
| 427 | current->mm->start_brk = 0; |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 428 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | current->mm->brk = current->mm->start_brk; |
| 432 | current->mm->context.end_brk = current->mm->start_brk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | current->mm->start_stack = current->mm->start_brk + stack_size; |
| 434 | #endif |
| 435 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 436 | install_exec_creds(bprm); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 437 | if (create_elf_fdpic_tables(bprm, current->mm, |
| 438 | &exec_params, &interp_params) < 0) |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 439 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 441 | kdebug("- start_code %lx", current->mm->start_code); |
| 442 | kdebug("- end_code %lx", current->mm->end_code); |
| 443 | kdebug("- start_data %lx", current->mm->start_data); |
| 444 | kdebug("- end_data %lx", current->mm->end_data); |
| 445 | kdebug("- start_brk %lx", current->mm->start_brk); |
| 446 | kdebug("- brk %lx", current->mm->brk); |
| 447 | kdebug("- start_stack %lx", current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
| 449 | #ifdef ELF_FDPIC_PLAT_INIT |
| 450 | /* |
| 451 | * The ABI may specify that certain registers be set up in special |
| 452 | * ways (on i386 %edx is the address of a DT_FINI function, for |
| 453 | * example. This macro performs whatever initialization to |
| 454 | * the regs structure is required. |
| 455 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 456 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
| 457 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
| 458 | dynaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | #endif |
| 460 | |
| 461 | /* everything is now ready... get the userspace context ready to roll */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 462 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
| 463 | start_thread(regs, entryaddr, current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | retval = 0; |
| 466 | |
| 467 | error: |
| 468 | if (interpreter) { |
| 469 | allow_write_access(interpreter); |
| 470 | fput(interpreter); |
| 471 | } |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 472 | kfree(interpreter_name); |
| 473 | kfree(exec_params.phdrs); |
| 474 | kfree(exec_params.loadmap); |
| 475 | kfree(interp_params.phdrs); |
| 476 | kfree(interp_params.loadmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return retval; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | /*****************************************************************************/ |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 481 | |
| 482 | #ifndef ELF_BASE_PLATFORM |
| 483 | /* |
| 484 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
| 485 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
| 486 | * will be copied to the user stack in the same manner as AT_PLATFORM. |
| 487 | */ |
| 488 | #define ELF_BASE_PLATFORM NULL |
| 489 | #endif |
| 490 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | /* |
Paul Mundt | c763794 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 492 | * present useful information to the program by shovelling it onto the new |
| 493 | * process's stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | */ |
| 495 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
| 496 | struct mm_struct *mm, |
| 497 | struct elf_fdpic_params *exec_params, |
| 498 | struct elf_fdpic_params *interp_params) |
| 499 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 500 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | unsigned long sp, csp, nitems; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 502 | elf_caddr_t __user *argv, *envp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | size_t platform_len = 0, len; |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 504 | char *k_platform, *k_base_platform; |
| 505 | char __user *u_platform, *u_base_platform, *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | int loop; |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 507 | int nr; /* reset for each csp adjustment */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | #ifdef CONFIG_MMU |
Paul Mundt | c763794 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 510 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
| 511 | * by the processes running on the same package. One thing we can do is |
| 512 | * to shuffle the initial stack for them, so we give the architecture |
| 513 | * an opportunity to do so here. |
| 514 | */ |
| 515 | sp = arch_align_stack(bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | #else |
| 517 | sp = mm->start_stack; |
| 518 | |
| 519 | /* stack the program arguments and environment */ |
Nicolas Pitre | 7e7ec6a | 2016-07-24 11:30:18 -0400 | [diff] [blame] | 520 | if (transfer_args_to_stack(bprm, &sp) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | return -EFAULT; |
Nicolas Pitre | 7e7ec6a | 2016-07-24 11:30:18 -0400 | [diff] [blame] | 522 | sp &= ~15; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | #endif |
| 524 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 525 | /* |
| 526 | * If this architecture has a platform capability string, copy it |
| 527 | * to userspace. In some cases (Sparc), this info is impossible |
| 528 | * for userspace to get any other way, in others (i386) it is |
| 529 | * merely difficult. |
| 530 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | k_platform = ELF_PLATFORM; |
David Howells | 1aeb21d | 2006-07-10 04:44:50 -0700 | [diff] [blame] | 532 | u_platform = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | |
| 534 | if (k_platform) { |
| 535 | platform_len = strlen(k_platform) + 1; |
| 536 | sp -= platform_len; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 537 | u_platform = (char __user *) sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
| 539 | return -EFAULT; |
| 540 | } |
| 541 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 542 | /* |
| 543 | * If this architecture has a "base" platform capability |
| 544 | * string, copy it to userspace. |
| 545 | */ |
| 546 | k_base_platform = ELF_BASE_PLATFORM; |
| 547 | u_base_platform = NULL; |
| 548 | |
| 549 | if (k_base_platform) { |
| 550 | platform_len = strlen(k_base_platform) + 1; |
| 551 | sp -= platform_len; |
| 552 | u_base_platform = (char __user *) sp; |
| 553 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
| 554 | return -EFAULT; |
| 555 | } |
| 556 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | sp &= ~7UL; |
| 558 | |
| 559 | /* stack the load map(s) */ |
| 560 | len = sizeof(struct elf32_fdpic_loadmap); |
| 561 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
| 562 | sp = (sp - len) & ~7UL; |
| 563 | exec_params->map_addr = sp; |
| 564 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 565 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | return -EFAULT; |
| 567 | |
| 568 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
| 569 | |
| 570 | if (interp_params->loadmap) { |
| 571 | len = sizeof(struct elf32_fdpic_loadmap); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 572 | len += sizeof(struct elf32_fdpic_loadseg) * |
| 573 | interp_params->loadmap->nsegs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | sp = (sp - len) & ~7UL; |
| 575 | interp_params->map_addr = sp; |
| 576 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 577 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
| 578 | len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return -EFAULT; |
| 580 | |
| 581 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
| 582 | } |
| 583 | |
| 584 | /* force 16 byte _final_ alignment here for generality */ |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 585 | #define DLINFO_ITEMS 15 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 587 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
| 588 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 590 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
| 591 | nitems++; |
| 592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | csp = sp; |
| 594 | sp -= nitems * 2 * sizeof(unsigned long); |
| 595 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
| 596 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
| 597 | sp -= 1 * sizeof(unsigned long); /* argc */ |
| 598 | |
| 599 | csp -= sp & 15UL; |
| 600 | sp -= sp & 15UL; |
| 601 | |
| 602 | /* put the ELF interpreter info on the stack */ |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 603 | #define NEW_AUX_ENT(id, val) \ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 604 | do { \ |
| 605 | struct { unsigned long _id, _val; } __user *ent; \ |
| 606 | \ |
| 607 | ent = (void __user *) csp; \ |
| 608 | __put_user((id), &ent[nr]._id); \ |
| 609 | __put_user((val), &ent[nr]._val); \ |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 610 | nr++; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } while (0) |
| 612 | |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 613 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | csp -= 2 * sizeof(unsigned long); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 615 | NEW_AUX_ENT(AT_NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | if (k_platform) { |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 617 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | csp -= 2 * sizeof(unsigned long); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 619 | NEW_AUX_ENT(AT_PLATFORM, |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 620 | (elf_addr_t) (unsigned long) u_platform); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } |
| 622 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 623 | if (k_base_platform) { |
| 624 | nr = 0; |
| 625 | csp -= 2 * sizeof(unsigned long); |
| 626 | NEW_AUX_ENT(AT_BASE_PLATFORM, |
| 627 | (elf_addr_t) (unsigned long) u_base_platform); |
| 628 | } |
| 629 | |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 630 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
| 631 | nr = 0; |
| 632 | csp -= 2 * sizeof(unsigned long); |
| 633 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
| 634 | } |
| 635 | |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 636 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
Michael Neuling | 2171364 | 2013-04-17 17:33:11 +0000 | [diff] [blame] | 638 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
| 639 | #ifdef ELF_HWCAP2 |
| 640 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); |
| 641 | #endif |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 642 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
| 643 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
| 644 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
| 645 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
| 646 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
| 647 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
| 648 | NEW_AUX_ENT(AT_FLAGS, 0); |
| 649 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
Eric W. Biederman | ebc887b | 2012-02-07 18:36:10 -0800 | [diff] [blame] | 650 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); |
| 651 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); |
| 652 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); |
| 653 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 654 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
| 655 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | #ifdef ARCH_DLINFO |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 658 | nr = 0; |
| 659 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
| 660 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | /* ARCH_DLINFO must come last so platform specific code can enforce |
| 662 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
| 663 | */ |
| 664 | ARCH_DLINFO; |
| 665 | #endif |
| 666 | #undef NEW_AUX_ENT |
| 667 | |
| 668 | /* allocate room for argv[] and envv[] */ |
| 669 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 670 | envp = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 672 | argv = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | |
| 674 | /* stack argc */ |
| 675 | csp -= sizeof(unsigned long); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 676 | __put_user(bprm->argc, (unsigned long __user *) csp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
Eric Sesterhenn | 88bcd51 | 2006-03-24 18:38:48 +0100 | [diff] [blame] | 678 | BUG_ON(csp != sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | /* fill in the argv[] array */ |
| 681 | #ifdef CONFIG_MMU |
| 682 | current->mm->arg_start = bprm->p; |
| 683 | #else |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 684 | current->mm->arg_start = current->mm->start_stack - |
| 685 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | #endif |
| 687 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 688 | p = (char __user *) current->mm->arg_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | for (loop = bprm->argc; loop > 0; loop--) { |
| 690 | __put_user((elf_caddr_t) p, argv++); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 691 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 692 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | return -EINVAL; |
| 694 | p += len; |
| 695 | } |
| 696 | __put_user(NULL, argv); |
| 697 | current->mm->arg_end = (unsigned long) p; |
| 698 | |
| 699 | /* fill in the envv[] array */ |
| 700 | current->mm->env_start = (unsigned long) p; |
| 701 | for (loop = bprm->envc; loop > 0; loop--) { |
| 702 | __put_user((elf_caddr_t)(unsigned long) p, envp++); |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 703 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 704 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | return -EINVAL; |
| 706 | p += len; |
| 707 | } |
| 708 | __put_user(NULL, envp); |
| 709 | current->mm->env_end = (unsigned long) p; |
| 710 | |
| 711 | mm->start_stack = (unsigned long) sp; |
| 712 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 713 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
| 715 | /*****************************************************************************/ |
| 716 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | * load the appropriate binary image (executable or interpreter) into memory |
| 718 | * - we assume no MMU is available |
| 719 | * - if no other PIC bits are set in params->hdr->e_flags |
| 720 | * - we assume that the LOADable segments in the binary are independently relocatable |
| 721 | * - we assume R/O executable segments are shareable |
| 722 | * - else |
| 723 | * - we assume the loadable parts of the image to require fixed displacement |
| 724 | * - the image is not shareable |
| 725 | */ |
| 726 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
| 727 | struct file *file, |
| 728 | struct mm_struct *mm, |
| 729 | const char *what) |
| 730 | { |
| 731 | struct elf32_fdpic_loadmap *loadmap; |
| 732 | #ifdef CONFIG_MMU |
| 733 | struct elf32_fdpic_loadseg *mseg; |
| 734 | #endif |
| 735 | struct elf32_fdpic_loadseg *seg; |
| 736 | struct elf32_phdr *phdr; |
| 737 | unsigned long load_addr, stop; |
| 738 | unsigned nloads, tmp; |
| 739 | size_t size; |
| 740 | int loop, ret; |
| 741 | |
| 742 | /* allocate a load map table */ |
| 743 | nloads = 0; |
| 744 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
| 745 | if (params->phdrs[loop].p_type == PT_LOAD) |
| 746 | nloads++; |
| 747 | |
| 748 | if (nloads == 0) |
| 749 | return -ELIBBAD; |
| 750 | |
| 751 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
Robert P. J. Day | b87576d | 2006-12-12 20:07:35 +0100 | [diff] [blame] | 752 | loadmap = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | if (!loadmap) |
| 754 | return -ENOMEM; |
| 755 | |
| 756 | params->loadmap = loadmap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | |
| 758 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
| 759 | loadmap->nsegs = nloads; |
| 760 | |
| 761 | load_addr = params->load_addr; |
| 762 | seg = loadmap->segs; |
| 763 | |
| 764 | /* map the requested LOADs into the memory space */ |
| 765 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 766 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 767 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 768 | #ifndef CONFIG_MMU |
| 769 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
| 770 | if (ret < 0) |
| 771 | return ret; |
| 772 | break; |
| 773 | #endif |
| 774 | default: |
| 775 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
| 776 | if (ret < 0) |
| 777 | return ret; |
| 778 | break; |
| 779 | } |
| 780 | |
| 781 | /* map the entry point */ |
| 782 | if (params->hdr.e_entry) { |
| 783 | seg = loadmap->segs; |
| 784 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 785 | if (params->hdr.e_entry >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 786 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | params->entry_addr = |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 788 | (params->hdr.e_entry - seg->p_vaddr) + |
| 789 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | break; |
| 791 | } |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | /* determine where the program header table has wound up if mapped */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 796 | stop = params->hdr.e_phoff; |
| 797 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | phdr = params->phdrs; |
| 799 | |
| 800 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 801 | if (phdr->p_type != PT_LOAD) |
| 802 | continue; |
| 803 | |
| 804 | if (phdr->p_offset > params->hdr.e_phoff || |
| 805 | phdr->p_offset + phdr->p_filesz < stop) |
| 806 | continue; |
| 807 | |
| 808 | seg = loadmap->segs; |
| 809 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 810 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 811 | phdr->p_vaddr + phdr->p_filesz <= |
| 812 | seg->p_vaddr + seg->p_memsz) { |
| 813 | params->ph_addr = |
| 814 | (phdr->p_vaddr - seg->p_vaddr) + |
| 815 | seg->addr + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | params->hdr.e_phoff - phdr->p_offset; |
| 817 | break; |
| 818 | } |
| 819 | } |
| 820 | break; |
| 821 | } |
| 822 | |
| 823 | /* determine where the dynamic section has wound up if there is one */ |
| 824 | phdr = params->phdrs; |
| 825 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 826 | if (phdr->p_type != PT_DYNAMIC) |
| 827 | continue; |
| 828 | |
| 829 | seg = loadmap->segs; |
| 830 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 831 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 832 | phdr->p_vaddr + phdr->p_memsz <= |
| 833 | seg->p_vaddr + seg->p_memsz) { |
| 834 | params->dynamic_addr = |
| 835 | (phdr->p_vaddr - seg->p_vaddr) + |
| 836 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 838 | /* check the dynamic section contains at least |
| 839 | * one item, and that the last item is a NULL |
| 840 | * entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | if (phdr->p_memsz == 0 || |
| 842 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
| 843 | goto dynamic_error; |
| 844 | |
| 845 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 846 | if (((Elf32_Dyn *) |
| 847 | params->dynamic_addr)[tmp - 1].d_tag != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | goto dynamic_error; |
| 849 | break; |
| 850 | } |
| 851 | } |
| 852 | break; |
| 853 | } |
| 854 | |
| 855 | /* now elide adjacent segments in the load map on MMU linux |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 856 | * - on uClinux the holes between may actually be filled with system |
| 857 | * stuff or stuff from other processes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | */ |
| 859 | #ifdef CONFIG_MMU |
| 860 | nloads = loadmap->nsegs; |
| 861 | mseg = loadmap->segs; |
| 862 | seg = mseg + 1; |
| 863 | for (loop = 1; loop < nloads; loop++) { |
| 864 | /* see if we have a candidate for merging */ |
| 865 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
| 866 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
| 867 | if (load_addr == (seg->addr & PAGE_MASK)) { |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 868 | mseg->p_memsz += |
| 869 | load_addr - |
| 870 | (mseg->addr + mseg->p_memsz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
| 872 | mseg->p_memsz += seg->p_memsz; |
| 873 | loadmap->nsegs--; |
| 874 | continue; |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | mseg++; |
| 879 | if (mseg != seg) |
| 880 | *mseg = *seg; |
| 881 | } |
| 882 | #endif |
| 883 | |
| 884 | kdebug("Mapped Object [%s]:", what); |
| 885 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
| 886 | kdebug("- entry : %lx", params->entry_addr); |
| 887 | kdebug("- PHDR[] : %lx", params->ph_addr); |
| 888 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
| 889 | seg = loadmap->segs; |
| 890 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
| 891 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
| 892 | loop, |
| 893 | seg->addr, seg->addr + seg->p_memsz - 1, |
| 894 | seg->p_vaddr, seg->p_memsz); |
| 895 | |
| 896 | return 0; |
| 897 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 898 | dynamic_error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 900 | what, file_inode(file)->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | return -ELIBBAD; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 902 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | |
| 904 | /*****************************************************************************/ |
| 905 | /* |
| 906 | * map a file with constant displacement under uClinux |
| 907 | */ |
| 908 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 909 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
| 910 | struct elf_fdpic_params *params, |
| 911 | struct file *file, |
| 912 | struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | { |
| 914 | struct elf32_fdpic_loadseg *seg; |
| 915 | struct elf32_phdr *phdr; |
| 916 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | int loop, ret; |
| 918 | |
| 919 | load_addr = params->load_addr; |
| 920 | seg = params->loadmap->segs; |
| 921 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 922 | /* determine the bounds of the contiguous overall allocation we must |
| 923 | * make */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | phdr = params->phdrs; |
| 925 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 926 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 927 | continue; |
| 928 | |
| 929 | if (base > phdr->p_vaddr) |
| 930 | base = phdr->p_vaddr; |
| 931 | if (top < phdr->p_vaddr + phdr->p_memsz) |
| 932 | top = phdr->p_vaddr + phdr->p_memsz; |
| 933 | } |
| 934 | |
| 935 | /* allocate one big anon block for everything */ |
| 936 | mflags = MAP_PRIVATE; |
| 937 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
| 938 | mflags |= MAP_EXECUTABLE; |
| 939 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 940 | maddr = vm_mmap(NULL, load_addr, top - base, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 942 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | return (int) maddr; |
| 944 | |
| 945 | if (load_addr != 0) |
| 946 | load_addr += PAGE_ALIGN(top - base); |
| 947 | |
| 948 | /* and then load the file segments into it */ |
| 949 | phdr = params->phdrs; |
| 950 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 951 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 952 | continue; |
| 953 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | seg->addr = maddr + (phdr->p_vaddr - base); |
| 955 | seg->p_vaddr = phdr->p_vaddr; |
| 956 | seg->p_memsz = phdr->p_memsz; |
| 957 | |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 958 | ret = read_code(file, seg->addr, phdr->p_offset, |
| 959 | phdr->p_filesz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | if (ret < 0) |
| 961 | return ret; |
| 962 | |
| 963 | /* map the ELF header address if in this segment */ |
| 964 | if (phdr->p_offset == 0) |
| 965 | params->elfhdr_addr = seg->addr; |
| 966 | |
| 967 | /* clear any space allocated but not loaded */ |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 968 | if (phdr->p_filesz < phdr->p_memsz) { |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 969 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
| 970 | phdr->p_memsz - phdr->p_filesz)) |
| 971 | return -EFAULT; |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 972 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | if (mm) { |
| 975 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 976 | if (!mm->start_code) { |
| 977 | mm->start_code = seg->addr; |
| 978 | mm->end_code = seg->addr + |
| 979 | phdr->p_memsz; |
| 980 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 981 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | mm->start_data = seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | mm->end_data = seg->addr + phdr->p_memsz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |
| 986 | |
| 987 | seg++; |
| 988 | } |
| 989 | |
| 990 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 991 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | #endif |
| 993 | |
| 994 | /*****************************************************************************/ |
| 995 | /* |
| 996 | * map a binary by direct mmap() of the individual PT_LOAD segments |
| 997 | */ |
| 998 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
| 999 | struct file *file, |
| 1000 | struct mm_struct *mm) |
| 1001 | { |
| 1002 | struct elf32_fdpic_loadseg *seg; |
| 1003 | struct elf32_phdr *phdr; |
| 1004 | unsigned long load_addr, delta_vaddr; |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1005 | int loop, dvset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | |
| 1007 | load_addr = params->load_addr; |
| 1008 | delta_vaddr = 0; |
| 1009 | dvset = 0; |
| 1010 | |
| 1011 | seg = params->loadmap->segs; |
| 1012 | |
| 1013 | /* deal with each load segment separately */ |
| 1014 | phdr = params->phdrs; |
| 1015 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 1016 | unsigned long maddr, disp, excess, excess1; |
| 1017 | int prot = 0, flags; |
| 1018 | |
| 1019 | if (phdr->p_type != PT_LOAD) |
| 1020 | continue; |
| 1021 | |
| 1022 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
| 1023 | (unsigned long) phdr->p_vaddr, |
| 1024 | (unsigned long) phdr->p_offset, |
| 1025 | (unsigned long) phdr->p_filesz, |
| 1026 | (unsigned long) phdr->p_memsz); |
| 1027 | |
| 1028 | /* determine the mapping parameters */ |
| 1029 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
| 1030 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
| 1031 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
| 1032 | |
| 1033 | flags = MAP_PRIVATE | MAP_DENYWRITE; |
| 1034 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
| 1035 | flags |= MAP_EXECUTABLE; |
| 1036 | |
| 1037 | maddr = 0; |
| 1038 | |
| 1039 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 1040 | case ELF_FDPIC_FLAG_INDEPENDENT: |
| 1041 | /* PT_LOADs are independently locatable */ |
| 1042 | break; |
| 1043 | |
| 1044 | case ELF_FDPIC_FLAG_HONOURVADDR: |
| 1045 | /* the specified virtual address must be honoured */ |
| 1046 | maddr = phdr->p_vaddr; |
| 1047 | flags |= MAP_FIXED; |
| 1048 | break; |
| 1049 | |
| 1050 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 1051 | /* constant displacement |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1052 | * - can be mapped anywhere, but must be mapped as a |
| 1053 | * unit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | */ |
| 1055 | if (!dvset) { |
| 1056 | maddr = load_addr; |
| 1057 | delta_vaddr = phdr->p_vaddr; |
| 1058 | dvset = 1; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1059 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
| 1061 | flags |= MAP_FIXED; |
| 1062 | } |
| 1063 | break; |
| 1064 | |
| 1065 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 1066 | /* contiguity handled later */ |
| 1067 | break; |
| 1068 | |
| 1069 | default: |
| 1070 | BUG(); |
| 1071 | } |
| 1072 | |
| 1073 | maddr &= PAGE_MASK; |
| 1074 | |
| 1075 | /* create the mapping */ |
| 1076 | disp = phdr->p_vaddr & ~PAGE_MASK; |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 1077 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | phdr->p_offset - disp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | |
| 1080 | 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] | 1081 | loop, phdr->p_memsz + disp, prot, flags, |
| 1082 | phdr->p_offset - disp, maddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1084 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | return (int) maddr; |
| 1086 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1087 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
| 1088 | ELF_FDPIC_FLAG_CONTIGUOUS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
| 1090 | |
| 1091 | seg->addr = maddr + disp; |
| 1092 | seg->p_vaddr = phdr->p_vaddr; |
| 1093 | seg->p_memsz = phdr->p_memsz; |
| 1094 | |
| 1095 | /* map the ELF header address if in this segment */ |
| 1096 | if (phdr->p_offset == 0) |
| 1097 | params->elfhdr_addr = seg->addr; |
| 1098 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1099 | /* clear the bit between beginning of mapping and beginning of |
| 1100 | * PT_LOAD */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | if (prot & PROT_WRITE && disp > 0) { |
| 1102 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1103 | if (clear_user((void __user *) maddr, disp)) |
| 1104 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | maddr += disp; |
| 1106 | } |
| 1107 | |
| 1108 | /* clear any space allocated but not loaded |
| 1109 | * - on uClinux we can just clear the lot |
| 1110 | * - on MMU linux we'll get a SIGBUS beyond the last page |
| 1111 | * extant in the file |
| 1112 | */ |
| 1113 | excess = phdr->p_memsz - phdr->p_filesz; |
| 1114 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
| 1115 | |
| 1116 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | if (excess > excess1) { |
| 1118 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
| 1119 | unsigned long xmaddr; |
| 1120 | |
| 1121 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 1122 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1, |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1123 | prot, flags, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | |
| 1125 | kdebug("mmap[%d] <anon>" |
| 1126 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1127 | loop, xaddr, excess - excess1, prot, flags, |
| 1128 | xmaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | |
| 1130 | if (xmaddr != xaddr) |
| 1131 | return -ENOMEM; |
| 1132 | } |
| 1133 | |
| 1134 | if (prot & PROT_WRITE && excess1 > 0) { |
| 1135 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1136 | loop, maddr + phdr->p_filesz, excess1); |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1137 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
| 1138 | excess1)) |
| 1139 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | } |
| 1141 | |
| 1142 | #else |
| 1143 | if (excess > 0) { |
| 1144 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1145 | loop, maddr + phdr->p_filesz, excess); |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1146 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
| 1147 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | } |
| 1149 | #endif |
| 1150 | |
| 1151 | if (mm) { |
| 1152 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 1153 | if (!mm->start_code) { |
| 1154 | mm->start_code = maddr; |
| 1155 | mm->end_code = maddr + phdr->p_memsz; |
| 1156 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1157 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | mm->start_data = maddr; |
| 1159 | mm->end_data = maddr + phdr->p_memsz; |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | seg++; |
| 1164 | } |
| 1165 | |
| 1166 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1167 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1168 | |
| 1169 | /*****************************************************************************/ |
| 1170 | /* |
| 1171 | * ELF-FDPIC core dumper |
| 1172 | * |
| 1173 | * Modelled on fs/exec.c:aout_core_dump() |
| 1174 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
| 1175 | * |
| 1176 | * Modelled on fs/binfmt_elf.c core dumper |
| 1177 | */ |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 1178 | #ifdef CONFIG_ELF_CORE |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1179 | |
| 1180 | /* |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1181 | * Decide whether a segment is worth dumping; default is yes to be |
| 1182 | * sure (missing info is worse than too much; etc). |
| 1183 | * Personally I'd include everything, and use the coredump limit... |
| 1184 | * |
| 1185 | * I think we should skip something. But I am not sure how. H.J. |
| 1186 | */ |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1187 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1188 | { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1189 | int dump_ok; |
| 1190 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1191 | /* Do not dump I/O mapped devices or special mappings */ |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 1192 | if (vma->vm_flags & VM_IO) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1193 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
| 1194 | return 0; |
| 1195 | } |
| 1196 | |
| 1197 | /* If we may not read the contents, don't allow us to dump |
| 1198 | * them either. "dump_write()" can't handle it anyway. |
| 1199 | */ |
| 1200 | if (!(vma->vm_flags & VM_READ)) { |
| 1201 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); |
| 1202 | return 0; |
| 1203 | } |
| 1204 | |
Ross Zwisler | ab27a8d | 2015-10-05 16:33:37 -0600 | [diff] [blame] | 1205 | /* support for DAX */ |
| 1206 | if (vma_is_dax(vma)) { |
| 1207 | if (vma->vm_flags & VM_SHARED) { |
| 1208 | dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags); |
| 1209 | kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start, |
| 1210 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1211 | } else { |
| 1212 | dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags); |
| 1213 | kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start, |
| 1214 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1215 | } |
| 1216 | return dump_ok; |
| 1217 | } |
| 1218 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1219 | /* By default, dump shared memory if mapped from an anonymous file. */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1220 | if (vma->vm_flags & VM_SHARED) { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1221 | if (file_inode(vma->vm_file)->i_nlink == 0) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1222 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
| 1223 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
| 1224 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1225 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1226 | } |
| 1227 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1228 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
| 1229 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
| 1230 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1231 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1232 | } |
| 1233 | |
| 1234 | #ifdef CONFIG_MMU |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1235 | /* 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] | 1236 | if (!vma->anon_vma) { |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1237 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
| 1238 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, |
| 1239 | vma->vm_flags, dump_ok ? "yes" : "no"); |
| 1240 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1241 | } |
| 1242 | #endif |
| 1243 | |
Kawai, Hidehiro | ee78b0a | 2007-07-19 01:48:30 -0700 | [diff] [blame] | 1244 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
| 1245 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, |
| 1246 | dump_ok ? "yes" : "no"); |
| 1247 | return dump_ok; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1248 | } |
| 1249 | |
| 1250 | /* An ELF note in memory */ |
| 1251 | struct memelfnote |
| 1252 | { |
| 1253 | const char *name; |
| 1254 | int type; |
| 1255 | unsigned int datasz; |
| 1256 | void *data; |
| 1257 | }; |
| 1258 | |
| 1259 | static int notesize(struct memelfnote *en) |
| 1260 | { |
| 1261 | int sz; |
| 1262 | |
| 1263 | sz = sizeof(struct elf_note); |
| 1264 | sz += roundup(strlen(en->name) + 1, 4); |
| 1265 | sz += roundup(en->datasz, 4); |
| 1266 | |
| 1267 | return sz; |
| 1268 | } |
| 1269 | |
| 1270 | /* #define DEBUG */ |
| 1271 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1272 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1273 | { |
| 1274 | struct elf_note en; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1275 | en.n_namesz = strlen(men->name) + 1; |
| 1276 | en.n_descsz = men->datasz; |
| 1277 | en.n_type = men->type; |
| 1278 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1279 | return dump_emit(cprm, &en, sizeof(en)) && |
Al Viro | 22a8cb8 | 2013-10-08 11:05:01 -0400 | [diff] [blame] | 1280 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
| 1281 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1282 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1283 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1284 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
| 1285 | { |
| 1286 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
| 1287 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
| 1288 | elf->e_ident[EI_DATA] = ELF_DATA; |
| 1289 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
| 1290 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
| 1291 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
| 1292 | |
| 1293 | elf->e_type = ET_CORE; |
| 1294 | elf->e_machine = ELF_ARCH; |
| 1295 | elf->e_version = EV_CURRENT; |
| 1296 | elf->e_entry = 0; |
| 1297 | elf->e_phoff = sizeof(struct elfhdr); |
| 1298 | elf->e_shoff = 0; |
| 1299 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
| 1300 | elf->e_ehsize = sizeof(struct elfhdr); |
| 1301 | elf->e_phentsize = sizeof(struct elf_phdr); |
| 1302 | elf->e_phnum = segs; |
| 1303 | elf->e_shentsize = 0; |
| 1304 | elf->e_shnum = 0; |
| 1305 | elf->e_shstrndx = 0; |
| 1306 | return; |
| 1307 | } |
| 1308 | |
| 1309 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
| 1310 | { |
| 1311 | phdr->p_type = PT_NOTE; |
| 1312 | phdr->p_offset = offset; |
| 1313 | phdr->p_vaddr = 0; |
| 1314 | phdr->p_paddr = 0; |
| 1315 | phdr->p_filesz = sz; |
| 1316 | phdr->p_memsz = 0; |
| 1317 | phdr->p_flags = 0; |
| 1318 | phdr->p_align = 0; |
| 1319 | return; |
| 1320 | } |
| 1321 | |
| 1322 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
| 1323 | unsigned int sz, void *data) |
| 1324 | { |
| 1325 | note->name = name; |
| 1326 | note->type = type; |
| 1327 | note->datasz = sz; |
| 1328 | note->data = data; |
| 1329 | return; |
| 1330 | } |
| 1331 | |
| 1332 | /* |
| 1333 | * fill up all the fields in prstatus from the given task struct, except |
Daniel Mack | 3ad2f3fb | 2010-02-03 08:01:28 +0800 | [diff] [blame] | 1334 | * registers which need to be filled up separately. |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1335 | */ |
| 1336 | static void fill_prstatus(struct elf_prstatus *prstatus, |
| 1337 | struct task_struct *p, long signr) |
| 1338 | { |
| 1339 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
| 1340 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
| 1341 | prstatus->pr_sighold = p->blocked.sig[0]; |
Oleg Nesterov | 3b34fc5 | 2009-06-17 16:27:38 -0700 | [diff] [blame] | 1342 | rcu_read_lock(); |
| 1343 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
| 1344 | rcu_read_unlock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1345 | prstatus->pr_pid = task_pid_vnr(p); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1346 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
| 1347 | prstatus->pr_sid = task_session_vnr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1348 | if (thread_group_leader(p)) { |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1349 | struct task_cputime cputime; |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1350 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1351 | /* |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1352 | * This is the record for the group leader. It shows the |
| 1353 | * group-wide total, not its individual thread total. |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1354 | */ |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1355 | thread_group_cputime(p, &cputime); |
| 1356 | prstatus->pr_utime = ns_to_timeval(cputime.utime); |
| 1357 | prstatus->pr_stime = ns_to_timeval(cputime.stime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1358 | } else { |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1359 | u64 utime, stime; |
Frederic Weisbecker | 6fac482 | 2012-11-13 14:20:55 +0100 | [diff] [blame] | 1360 | |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1361 | task_cputime(p, &utime, &stime); |
| 1362 | prstatus->pr_utime = ns_to_timeval(utime); |
| 1363 | prstatus->pr_stime = ns_to_timeval(stime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1364 | } |
Frederic Weisbecker | 5613fda | 2017-01-31 04:09:23 +0100 | [diff] [blame] | 1365 | prstatus->pr_cutime = ns_to_timeval(p->signal->cutime); |
| 1366 | prstatus->pr_cstime = ns_to_timeval(p->signal->cstime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1367 | |
| 1368 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
| 1369 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
| 1370 | } |
| 1371 | |
| 1372 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
| 1373 | struct mm_struct *mm) |
| 1374 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1375 | const struct cred *cred; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1376 | unsigned int i, len; |
| 1377 | |
| 1378 | /* first copy the parameters from user space */ |
| 1379 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
| 1380 | |
| 1381 | len = mm->arg_end - mm->arg_start; |
| 1382 | if (len >= ELF_PRARGSZ) |
| 1383 | len = ELF_PRARGSZ - 1; |
| 1384 | if (copy_from_user(&psinfo->pr_psargs, |
| 1385 | (const char __user *) mm->arg_start, len)) |
| 1386 | return -EFAULT; |
| 1387 | for (i = 0; i < len; i++) |
| 1388 | if (psinfo->pr_psargs[i] == 0) |
| 1389 | psinfo->pr_psargs[i] = ' '; |
| 1390 | psinfo->pr_psargs[len] = 0; |
| 1391 | |
Oleg Nesterov | 3b34fc5 | 2009-06-17 16:27:38 -0700 | [diff] [blame] | 1392 | rcu_read_lock(); |
| 1393 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
| 1394 | rcu_read_unlock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1395 | psinfo->pr_pid = task_pid_vnr(p); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1396 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
| 1397 | psinfo->pr_sid = task_session_vnr(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; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1405 | rcu_read_lock(); |
| 1406 | cred = __task_cred(p); |
Eric W. Biederman | ebc887b | 2012-02-07 18:36:10 -0800 | [diff] [blame] | 1407 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
| 1408 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1409 | rcu_read_unlock(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1410 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
| 1411 | |
| 1412 | return 0; |
| 1413 | } |
| 1414 | |
| 1415 | /* Here is the structure in which status of each thread is captured. */ |
| 1416 | struct elf_thread_status |
| 1417 | { |
| 1418 | struct list_head list; |
| 1419 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
| 1420 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
| 1421 | struct task_struct *thread; |
| 1422 | #ifdef ELF_CORE_COPY_XFPREGS |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1423 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1424 | #endif |
| 1425 | struct memelfnote notes[3]; |
| 1426 | int num_notes; |
| 1427 | }; |
| 1428 | |
| 1429 | /* |
| 1430 | * In order to add the specific thread information for the elf file format, |
| 1431 | * we need to keep a linked list of every thread's pr_status and then create |
| 1432 | * a single section for them in the final core file. |
| 1433 | */ |
| 1434 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
| 1435 | { |
| 1436 | struct task_struct *p = t->thread; |
| 1437 | int sz = 0; |
| 1438 | |
| 1439 | t->num_notes = 0; |
| 1440 | |
| 1441 | fill_prstatus(&t->prstatus, p, signr); |
| 1442 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
| 1443 | |
| 1444 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
| 1445 | &t->prstatus); |
| 1446 | t->num_notes++; |
| 1447 | sz += notesize(&t->notes[0]); |
| 1448 | |
| 1449 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); |
| 1450 | if (t->prstatus.pr_fpvalid) { |
| 1451 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
| 1452 | &t->fpu); |
| 1453 | t->num_notes++; |
| 1454 | sz += notesize(&t->notes[1]); |
| 1455 | } |
| 1456 | |
| 1457 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1458 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1459 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
| 1460 | sizeof(t->xfpu), &t->xfpu); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1461 | t->num_notes++; |
| 1462 | sz += notesize(&t->notes[2]); |
| 1463 | } |
| 1464 | #endif |
| 1465 | return sz; |
| 1466 | } |
| 1467 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1468 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
| 1469 | elf_addr_t e_shoff, int segs) |
| 1470 | { |
| 1471 | elf->e_shoff = e_shoff; |
| 1472 | elf->e_shentsize = sizeof(*shdr4extnum); |
| 1473 | elf->e_shnum = 1; |
| 1474 | elf->e_shstrndx = SHN_UNDEF; |
| 1475 | |
| 1476 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); |
| 1477 | |
| 1478 | shdr4extnum->sh_type = SHT_NULL; |
| 1479 | shdr4extnum->sh_size = elf->e_shnum; |
| 1480 | shdr4extnum->sh_link = elf->e_shstrndx; |
| 1481 | shdr4extnum->sh_info = segs; |
| 1482 | } |
| 1483 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1484 | /* |
| 1485 | * dump the segments for an MMU process |
| 1486 | */ |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1487 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1488 | { |
| 1489 | struct vm_area_struct *vma; |
| 1490 | |
| 1491 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
| 1492 | unsigned long addr; |
| 1493 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1494 | if (!maydump(vma, cprm->mm_flags)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1495 | continue; |
| 1496 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1497 | #ifdef CONFIG_MMU |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1498 | for (addr = vma->vm_start; addr < vma->vm_end; |
| 1499 | addr += PAGE_SIZE) { |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1500 | bool res; |
Hugh Dickins | f3e8fcc | 2009-09-21 17:03:25 -0700 | [diff] [blame] | 1501 | struct page *page = get_dump_page(addr); |
| 1502 | if (page) { |
| 1503 | void *kaddr = kmap(page); |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1504 | res = dump_emit(cprm, kaddr, PAGE_SIZE); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1505 | kunmap(page); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1506 | put_page(page); |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1507 | } else { |
Al Viro | 9b56d54 | 2013-10-08 09:26:08 -0400 | [diff] [blame] | 1508 | res = dump_skip(cprm, PAGE_SIZE); |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1509 | } |
| 1510 | if (!res) |
| 1511 | return false; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1512 | } |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1513 | #else |
| 1514 | if (!dump_emit(cprm, (void *) vma->vm_start, |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1515 | vma->vm_end - vma->vm_start)) |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1516 | return false; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1517 | #endif |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1518 | } |
| 1519 | return true; |
| 1520 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1521 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1522 | static size_t elf_core_vma_data_size(unsigned long mm_flags) |
| 1523 | { |
| 1524 | struct vm_area_struct *vma; |
| 1525 | size_t size = 0; |
| 1526 | |
David Howells | 47568d4 | 2010-03-24 17:02:28 +0000 | [diff] [blame] | 1527 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1528 | if (maydump(vma, mm_flags)) |
| 1529 | size += vma->vm_end - vma->vm_start; |
| 1530 | return size; |
| 1531 | } |
| 1532 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1533 | /* |
| 1534 | * Actual dumper |
| 1535 | * |
| 1536 | * This is a two-pass process; first we find the offsets of the bits, |
| 1537 | * and then they are actually written out. If we run out of core limit |
| 1538 | * we just truncate. |
| 1539 | */ |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 1540 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1541 | { |
| 1542 | #define NUM_NOTES 6 |
| 1543 | int has_dumped = 0; |
| 1544 | mm_segment_t fs; |
| 1545 | int segs; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1546 | int i; |
| 1547 | struct vm_area_struct *vma; |
| 1548 | struct elfhdr *elf = NULL; |
Al Viro | 9b56d54 | 2013-10-08 09:26:08 -0400 | [diff] [blame] | 1549 | loff_t offset = 0, dataoff; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1550 | int numnote; |
| 1551 | struct memelfnote *notes = NULL; |
| 1552 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
| 1553 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1554 | LIST_HEAD(thread_list); |
| 1555 | struct list_head *t; |
| 1556 | elf_fpregset_t *fpu = NULL; |
| 1557 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1558 | elf_fpxregset_t *xfpu = NULL; |
| 1559 | #endif |
| 1560 | int thread_status_size = 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1561 | elf_addr_t *auxv; |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1562 | struct elf_phdr *phdr4note = NULL; |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1563 | struct elf_shdr *shdr4extnum = NULL; |
| 1564 | Elf_Half e_phnum; |
| 1565 | elf_addr_t e_shoff; |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1566 | struct core_thread *ct; |
| 1567 | struct elf_thread_status *tmp; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1568 | |
| 1569 | /* |
| 1570 | * We no longer stop all VM operations. |
| 1571 | * |
| 1572 | * This is because those proceses that could possibly change map_count |
| 1573 | * or the mmap / vma pages are now blocked in do_exit on current |
| 1574 | * finishing this core dump. |
| 1575 | * |
| 1576 | * Only ptrace can touch these memory addresses, but it doesn't change |
| 1577 | * the map_count or the pages allocated. So no possibility of crashing |
| 1578 | * exists while dumping the mm->vm_next areas to the core file. |
| 1579 | */ |
| 1580 | |
| 1581 | /* alloc memory for large data structures: too large to be on stack */ |
| 1582 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
| 1583 | if (!elf) |
| 1584 | goto cleanup; |
| 1585 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); |
| 1586 | if (!prstatus) |
| 1587 | goto cleanup; |
| 1588 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
| 1589 | if (!psinfo) |
| 1590 | goto cleanup; |
| 1591 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
| 1592 | if (!notes) |
| 1593 | goto cleanup; |
| 1594 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
| 1595 | if (!fpu) |
| 1596 | goto cleanup; |
| 1597 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1598 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
| 1599 | if (!xfpu) |
| 1600 | goto cleanup; |
| 1601 | #endif |
| 1602 | |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1603 | for (ct = current->mm->core_state->dumper.next; |
| 1604 | ct; ct = ct->next) { |
| 1605 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
| 1606 | if (!tmp) |
| 1607 | goto cleanup; |
| 1608 | |
| 1609 | tmp->thread = ct->task; |
| 1610 | list_add(&tmp->list, &thread_list); |
| 1611 | } |
| 1612 | |
| 1613 | list_for_each(t, &thread_list) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1614 | struct elf_thread_status *tmp; |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1615 | int sz; |
Oleg Nesterov | 24d5288 | 2008-07-25 01:47:40 -0700 | [diff] [blame] | 1616 | |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1617 | tmp = list_entry(t, struct elf_thread_status, list); |
| 1618 | sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp); |
| 1619 | thread_status_size += sz; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1620 | } |
| 1621 | |
| 1622 | /* now collect the dump for the current */ |
Denys Vlasenko | 5ab1c30 | 2012-10-04 17:15:29 -0700 | [diff] [blame] | 1623 | fill_prstatus(prstatus, current, cprm->siginfo->si_signo); |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 1624 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1625 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1626 | segs = current->mm->map_count; |
Daisuke HATAYAMA | 1fcccba | 2010-03-05 13:44:07 -0800 | [diff] [blame] | 1627 | segs += elf_core_extra_phdrs(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1628 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1629 | /* for notes section */ |
| 1630 | segs++; |
| 1631 | |
| 1632 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid |
| 1633 | * this, kernel supports extended numbering. Have a look at |
| 1634 | * include/linux/elf.h for further information. */ |
| 1635 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; |
| 1636 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1637 | /* Set up header */ |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1638 | fill_elf_fdpic_header(elf, e_phnum); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1639 | |
| 1640 | has_dumped = 1; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1641 | /* |
| 1642 | * Set up the notes in similar form to SVR4 core dumps made |
| 1643 | * with info from their /proc. |
| 1644 | */ |
| 1645 | |
| 1646 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
| 1647 | fill_psinfo(psinfo, current->group_leader, current->mm); |
| 1648 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
| 1649 | |
| 1650 | numnote = 2; |
| 1651 | |
| 1652 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
| 1653 | |
| 1654 | i = 0; |
| 1655 | do |
| 1656 | i += 2; |
| 1657 | while (auxv[i - 2] != AT_NULL); |
| 1658 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
| 1659 | i * sizeof(elf_addr_t), auxv); |
| 1660 | |
| 1661 | /* Try to dump the FPU. */ |
| 1662 | if ((prstatus->pr_fpvalid = |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 1663 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1664 | fill_note(notes + numnote++, |
| 1665 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
| 1666 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1667 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
| 1668 | fill_note(notes + numnote++, |
Mark Nelson | 5b20cd8 | 2007-10-16 23:25:39 -0700 | [diff] [blame] | 1669 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1670 | #endif |
| 1671 | |
| 1672 | fs = get_fs(); |
| 1673 | set_fs(KERNEL_DS); |
| 1674 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1675 | offset += sizeof(*elf); /* Elf header */ |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1676 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1677 | |
| 1678 | /* Write notes phdr entry */ |
| 1679 | { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1680 | int sz = 0; |
| 1681 | |
| 1682 | for (i = 0; i < numnote; i++) |
| 1683 | sz += notesize(notes + i); |
| 1684 | |
| 1685 | sz += thread_status_size; |
| 1686 | |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1687 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
| 1688 | if (!phdr4note) |
Daisuke HATAYAMA | 088e7af | 2010-03-05 13:44:06 -0800 | [diff] [blame] | 1689 | goto end_coredump; |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1690 | |
| 1691 | fill_elf_note_phdr(phdr4note, sz, offset); |
| 1692 | offset += sz; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1693 | } |
| 1694 | |
| 1695 | /* Page-align dumped data */ |
| 1696 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
| 1697 | |
Masami Hiramatsu | 30736a4 | 2010-03-05 13:44:12 -0800 | [diff] [blame] | 1698 | offset += elf_core_vma_data_size(cprm->mm_flags); |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1699 | offset += elf_core_extra_data_size(); |
| 1700 | e_shoff = offset; |
| 1701 | |
| 1702 | if (e_phnum == PN_XNUM) { |
| 1703 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); |
| 1704 | if (!shdr4extnum) |
| 1705 | goto end_coredump; |
| 1706 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); |
| 1707 | } |
| 1708 | |
| 1709 | offset = dataoff; |
| 1710 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1711 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1712 | goto end_coredump; |
| 1713 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1714 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1715 | goto end_coredump; |
| 1716 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1717 | /* write program headers for segments dump */ |
David Howells | 8feae13 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 1718 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1719 | struct elf_phdr phdr; |
| 1720 | size_t sz; |
| 1721 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1722 | sz = vma->vm_end - vma->vm_start; |
| 1723 | |
| 1724 | phdr.p_type = PT_LOAD; |
| 1725 | phdr.p_offset = offset; |
| 1726 | phdr.p_vaddr = vma->vm_start; |
| 1727 | phdr.p_paddr = 0; |
Masami Hiramatsu | 30736a4 | 2010-03-05 13:44:12 -0800 | [diff] [blame] | 1728 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1729 | phdr.p_memsz = sz; |
| 1730 | offset += phdr.p_filesz; |
| 1731 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
| 1732 | if (vma->vm_flags & VM_WRITE) |
| 1733 | phdr.p_flags |= PF_W; |
| 1734 | if (vma->vm_flags & VM_EXEC) |
| 1735 | phdr.p_flags |= PF_X; |
| 1736 | phdr.p_align = ELF_EXEC_PAGESIZE; |
| 1737 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1738 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
Daisuke HATAYAMA | 088e7af | 2010-03-05 13:44:06 -0800 | [diff] [blame] | 1739 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1740 | } |
| 1741 | |
Al Viro | 506f21c | 2013-10-05 17:22:57 -0400 | [diff] [blame] | 1742 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
Daisuke HATAYAMA | 1fcccba | 2010-03-05 13:44:07 -0800 | [diff] [blame] | 1743 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1744 | |
| 1745 | /* write out the notes section */ |
| 1746 | for (i = 0; i < numnote; i++) |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1747 | if (!writenote(notes + i, cprm)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1748 | goto end_coredump; |
| 1749 | |
| 1750 | /* write out the thread status notes section */ |
| 1751 | list_for_each(t, &thread_list) { |
| 1752 | struct elf_thread_status *tmp = |
| 1753 | list_entry(t, struct elf_thread_status, list); |
| 1754 | |
| 1755 | for (i = 0; i < tmp->num_notes; i++) |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1756 | if (!writenote(&tmp->notes[i], cprm)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1757 | goto end_coredump; |
| 1758 | } |
| 1759 | |
Mateusz Guzik | 1607f09 | 2016-06-05 23:14:14 +0200 | [diff] [blame] | 1760 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1761 | goto end_coredump; |
| 1762 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1763 | if (!elf_fdpic_dump_segments(cprm)) |
| 1764 | goto end_coredump; |
| 1765 | |
Al Viro | aa3e7ea | 2013-10-05 17:50:15 -0400 | [diff] [blame] | 1766 | if (!elf_core_write_extra_data(cprm)) |
Daisuke HATAYAMA | 1fcccba | 2010-03-05 13:44:07 -0800 | [diff] [blame] | 1767 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1768 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1769 | if (e_phnum == PN_XNUM) { |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1770 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1771 | goto end_coredump; |
| 1772 | } |
| 1773 | |
Daisuke HATAYAMA | 2f48912 | 2010-01-04 15:42:14 +0900 | [diff] [blame] | 1774 | if (cprm->file->f_pos != offset) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1775 | /* Sanity check */ |
| 1776 | printk(KERN_WARNING |
| 1777 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
Daisuke HATAYAMA | 2f48912 | 2010-01-04 15:42:14 +0900 | [diff] [blame] | 1778 | cprm->file->f_pos, offset); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1779 | } |
| 1780 | |
| 1781 | end_coredump: |
| 1782 | set_fs(fs); |
| 1783 | |
| 1784 | cleanup: |
| 1785 | while (!list_empty(&thread_list)) { |
| 1786 | struct list_head *tmp = thread_list.next; |
| 1787 | list_del(tmp); |
| 1788 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
| 1789 | } |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1790 | kfree(phdr4note); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1791 | kfree(elf); |
| 1792 | kfree(prstatus); |
| 1793 | kfree(psinfo); |
| 1794 | kfree(notes); |
| 1795 | kfree(fpu); |
Davidlohr Bueso | bcb65a7 | 2011-07-06 12:26:05 +0100 | [diff] [blame] | 1796 | kfree(shdr4extnum); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1797 | #ifdef ELF_CORE_COPY_XFPREGS |
| 1798 | kfree(xfpu); |
| 1799 | #endif |
| 1800 | return has_dumped; |
| 1801 | #undef NUM_NOTES |
| 1802 | } |
| 1803 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 1804 | #endif /* CONFIG_ELF_CORE */ |