Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
| 3 | * |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 4 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Written by David Howells (dhowells@redhat.com) |
| 6 | * Derived from binfmt_elf.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | |
| 11 | #include <linux/fs.h> |
| 12 | #include <linux/stat.h> |
| 13 | #include <linux/sched.h> |
Ingo Molnar | 68db0cf | 2017-02-08 18:51:37 +0100 | [diff] [blame] | 14 | #include <linux/sched/coredump.h> |
| 15 | #include <linux/sched/task_stack.h> |
Ingo Molnar | 32ef551 | 2017-02-05 11:48:36 +0100 | [diff] [blame] | 16 | #include <linux/sched/cputime.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/mm.h> |
| 18 | #include <linux/mman.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/signal.h> |
| 21 | #include <linux/binfmts.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/file.h> |
| 24 | #include <linux/fcntl.h> |
| 25 | #include <linux/slab.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 26 | #include <linux/pagemap.h> |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 27 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/highmem.h> |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 29 | #include <linux/highuid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/personality.h> |
| 31 | #include <linux/ptrace.h> |
| 32 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/elf.h> |
| 34 | #include <linux/elf-fdpic.h> |
| 35 | #include <linux/elfcore.h> |
Daisuke HATAYAMA | 088e7af | 2010-03-05 13:44:06 -0800 | [diff] [blame] | 36 | #include <linux/coredump.h> |
Ross Zwisler | ab27a8d | 2015-10-05 16:33:37 -0600 | [diff] [blame] | 37 | #include <linux/dax.h> |
Al Viro | 1697a32 | 2020-06-15 11:22:55 -0400 | [diff] [blame] | 38 | #include <linux/regset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 40 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/param.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | typedef char *elf_caddr_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | #if 0 |
| 46 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 47 | #else |
| 48 | #define kdebug(fmt, ...) do {} while(0) |
| 49 | #endif |
| 50 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 51 | #if 0 |
| 52 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
| 53 | #else |
| 54 | #define kdcore(fmt, ...) do {} while(0) |
| 55 | #endif |
| 56 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | MODULE_LICENSE("GPL"); |
| 58 | |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 59 | static int load_elf_fdpic_binary(struct linux_binprm *); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 60 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
| 61 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
| 62 | struct mm_struct *, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 64 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
| 65 | struct elf_fdpic_params *, |
| 66 | struct elf_fdpic_params *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 69 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
| 70 | struct file *, |
| 71 | struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | #endif |
| 73 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 74 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
| 75 | struct file *, struct mm_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 77 | #ifdef CONFIG_ELF_CORE |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 78 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 79 | #endif |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static struct linux_binfmt elf_fdpic_format = { |
| 82 | .module = THIS_MODULE, |
| 83 | .load_binary = load_elf_fdpic_binary, |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 84 | #ifdef CONFIG_ELF_CORE |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 85 | .core_dump = elf_fdpic_core_dump, |
| 86 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | .min_coredump = ELF_EXEC_PAGESIZE, |
| 88 | }; |
| 89 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 90 | static int __init init_elf_fdpic_binfmt(void) |
| 91 | { |
Al Viro | 8fc3dc5 | 2012-03-17 03:05:16 -0400 | [diff] [blame] | 92 | register_binfmt(&elf_fdpic_format); |
| 93 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 94 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 96 | static void __exit exit_elf_fdpic_binfmt(void) |
| 97 | { |
| 98 | unregister_binfmt(&elf_fdpic_format); |
| 99 | } |
| 100 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 101 | core_initcall(init_elf_fdpic_binfmt); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 102 | module_exit(exit_elf_fdpic_binfmt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 104 | static int is_elf(struct elfhdr *hdr, struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | { |
| 106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
| 107 | return 0; |
| 108 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
| 109 | return 0; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 110 | if (!elf_check_arch(hdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | return 0; |
Al Viro | 72c2d53 | 2013-09-22 16:27:52 -0400 | [diff] [blame] | 112 | if (!file->f_op->mmap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | return 0; |
| 114 | return 1; |
| 115 | } |
| 116 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 117 | #ifndef elf_check_fdpic |
| 118 | #define elf_check_fdpic(x) 0 |
| 119 | #endif |
| 120 | |
| 121 | #ifndef elf_check_const_displacement |
| 122 | #define elf_check_const_displacement(x) 0 |
| 123 | #endif |
| 124 | |
| 125 | static int is_constdisp(struct elfhdr *hdr) |
| 126 | { |
| 127 | if (!elf_check_fdpic(hdr)) |
| 128 | return 1; |
| 129 | if (elf_check_const_displacement(hdr)) |
| 130 | return 1; |
| 131 | return 0; |
| 132 | } |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | /*****************************************************************************/ |
| 135 | /* |
| 136 | * read the program headers table into memory |
| 137 | */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 138 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
| 139 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
| 141 | struct elf32_phdr *phdr; |
| 142 | unsigned long size; |
| 143 | int retval, loop; |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 144 | loff_t pos = params->hdr.e_phoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
| 147 | return -ENOMEM; |
| 148 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
| 149 | return -ENOMEM; |
| 150 | |
| 151 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
| 152 | params->phdrs = kmalloc(size, GFP_KERNEL); |
| 153 | if (!params->phdrs) |
| 154 | return -ENOMEM; |
| 155 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 156 | retval = kernel_read(file, params->phdrs, size, &pos); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 157 | if (unlikely(retval != size)) |
| 158 | return retval < 0 ? retval : -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | /* determine stack size for this binary */ |
| 161 | phdr = params->phdrs; |
| 162 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 163 | if (phdr->p_type != PT_GNU_STACK) |
| 164 | continue; |
| 165 | |
| 166 | if (phdr->p_flags & PF_X) |
| 167 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
| 168 | else |
| 169 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
| 170 | |
| 171 | params->stack_size = phdr->p_memsz; |
| 172 | break; |
| 173 | } |
| 174 | |
| 175 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 176 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | /*****************************************************************************/ |
| 179 | /* |
| 180 | * load an fdpic binary into various bits of memory |
| 181 | */ |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 182 | static int load_elf_fdpic_binary(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
| 184 | struct elf_fdpic_params exec_params, interp_params; |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 185 | struct pt_regs *regs = current_pt_regs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | struct elf_phdr *phdr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 187 | unsigned long stack_size, entryaddr; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 188 | #ifdef ELF_FDPIC_PLAT_INIT |
| 189 | unsigned long dynaddr; |
| 190 | #endif |
Mike Frysinger | 04e4f2b | 2010-01-06 17:23:17 +0000 | [diff] [blame] | 191 | #ifndef CONFIG_MMU |
| 192 | unsigned long stack_prot; |
| 193 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | struct file *interpreter = NULL; /* to shut gcc up */ |
| 195 | char *interpreter_name = NULL; |
| 196 | int executable_stack; |
| 197 | int retval, i; |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 198 | loff_t pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 200 | kdebug("____ LOAD %d ____", current->pid); |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | memset(&exec_params, 0, sizeof(exec_params)); |
| 203 | memset(&interp_params, 0, sizeof(interp_params)); |
| 204 | |
| 205 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
| 206 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
| 207 | |
| 208 | /* check that this is a binary we know how to deal with */ |
| 209 | retval = -ENOEXEC; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 210 | if (!is_elf(&exec_params.hdr, bprm->file)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | goto error; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 212 | if (!elf_check_fdpic(&exec_params.hdr)) { |
| 213 | #ifdef CONFIG_MMU |
| 214 | /* binfmt_elf handles non-fdpic elf except on nommu */ |
| 215 | goto error; |
| 216 | #else |
| 217 | /* nommu can only load ET_DYN (PIE) ELF */ |
| 218 | if (exec_params.hdr.e_type != ET_DYN) |
| 219 | goto error; |
| 220 | #endif |
| 221 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
| 223 | /* read the program header table */ |
| 224 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
| 225 | if (retval < 0) |
| 226 | goto error; |
| 227 | |
| 228 | /* scan for a program header that specifies an interpreter */ |
| 229 | phdr = exec_params.phdrs; |
| 230 | |
| 231 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
| 232 | switch (phdr->p_type) { |
| 233 | case PT_INTERP: |
| 234 | retval = -ENOMEM; |
| 235 | if (phdr->p_filesz > PATH_MAX) |
| 236 | goto error; |
| 237 | retval = -ENOENT; |
| 238 | if (phdr->p_filesz < 2) |
| 239 | goto error; |
| 240 | |
| 241 | /* read the name of the interpreter into memory */ |
Jesper Juhl | 792db3a | 2006-01-09 20:54:45 -0800 | [diff] [blame] | 242 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | if (!interpreter_name) |
| 244 | goto error; |
| 245 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 246 | pos = phdr->p_offset; |
| 247 | retval = kernel_read(bprm->file, interpreter_name, |
| 248 | phdr->p_filesz, &pos); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 249 | if (unlikely(retval != phdr->p_filesz)) { |
| 250 | if (retval >= 0) |
| 251 | retval = -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | goto error; |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 253 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | |
| 255 | retval = -ENOENT; |
| 256 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
| 257 | goto error; |
| 258 | |
| 259 | kdebug("Using ELF interpreter %s", interpreter_name); |
| 260 | |
| 261 | /* replace the program with the interpreter */ |
| 262 | interpreter = open_exec(interpreter_name); |
| 263 | retval = PTR_ERR(interpreter); |
| 264 | if (IS_ERR(interpreter)) { |
| 265 | interpreter = NULL; |
| 266 | goto error; |
| 267 | } |
| 268 | |
Alexey Dobriyan | 1fb8449 | 2007-01-26 00:57:16 -0800 | [diff] [blame] | 269 | /* |
| 270 | * If the binary is not readable then enforce |
| 271 | * mm->dumpable = 0 regardless of the interpreter's |
| 272 | * permissions. |
| 273 | */ |
Al Viro | 1b5d783 | 2011-06-19 12:49:47 -0400 | [diff] [blame] | 274 | would_dump(bprm, interpreter); |
Alexey Dobriyan | 1fb8449 | 2007-01-26 00:57:16 -0800 | [diff] [blame] | 275 | |
Christoph Hellwig | bdd1d2d | 2017-09-01 17:39:13 +0200 | [diff] [blame] | 276 | pos = 0; |
| 277 | retval = kernel_read(interpreter, bprm->buf, |
| 278 | BINPRM_BUF_SIZE, &pos); |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 279 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
| 280 | if (retval >= 0) |
| 281 | retval = -ENOEXEC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | goto error; |
David Howells | e1d2c8b | 2008-04-29 00:59:34 -0700 | [diff] [blame] | 283 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
| 286 | break; |
| 287 | |
| 288 | case PT_LOAD: |
| 289 | #ifdef CONFIG_MMU |
| 290 | if (exec_params.load_addr == 0) |
| 291 | exec_params.load_addr = phdr->p_vaddr; |
| 292 | #endif |
| 293 | break; |
| 294 | } |
| 295 | |
| 296 | } |
| 297 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 298 | if (is_constdisp(&exec_params.hdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 300 | |
| 301 | /* perform insanity checks on the interpreter */ |
| 302 | if (interpreter_name) { |
| 303 | retval = -ELIBBAD; |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 304 | if (!is_elf(&interp_params.hdr, interpreter)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | goto error; |
| 306 | |
| 307 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
| 308 | |
| 309 | /* read the interpreter's program header table */ |
| 310 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
| 311 | if (retval < 0) |
| 312 | goto error; |
| 313 | } |
| 314 | |
| 315 | stack_size = exec_params.stack_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 317 | executable_stack = EXSTACK_ENABLE_X; |
| 318 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 319 | executable_stack = EXSTACK_DISABLE_X; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | else |
| 321 | executable_stack = EXSTACK_DEFAULT; |
| 322 | |
David Howells | 8e8b63a | 2009-09-23 15:57:06 -0700 | [diff] [blame] | 323 | if (stack_size == 0) { |
| 324 | stack_size = interp_params.stack_size; |
| 325 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
| 326 | executable_stack = EXSTACK_ENABLE_X; |
| 327 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
| 328 | executable_stack = EXSTACK_DISABLE_X; |
| 329 | else |
| 330 | executable_stack = EXSTACK_DEFAULT; |
| 331 | } |
| 332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | retval = -ENOEXEC; |
| 334 | if (stack_size == 0) |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 335 | stack_size = 131072UL; /* same as exec.c's default commit */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 337 | if (is_constdisp(&interp_params.hdr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
| 339 | |
| 340 | /* flush all traces of the currently running executable */ |
Eric W. Biederman | 2388777 | 2020-05-03 07:54:10 -0500 | [diff] [blame] | 341 | retval = begin_new_exec(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | if (retval) |
| 343 | goto error; |
| 344 | |
| 345 | /* there's now no turning back... the old userspace image is dead, |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 346 | * defunct, deceased, etc. |
| 347 | */ |
Rich Felker | 1bde925 | 2015-11-09 14:59:01 -0800 | [diff] [blame] | 348 | if (elf_check_fdpic(&exec_params.hdr)) |
| 349 | set_personality(PER_LINUX_FDPIC); |
| 350 | else |
| 351 | set_personality(PER_LINUX); |
Mike Frysinger | 04e4f2b | 2010-01-06 17:23:17 +0000 | [diff] [blame] | 352 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
| 353 | current->personality |= READ_IMPLIES_EXEC; |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 354 | |
| 355 | setup_new_exec(bprm); |
| 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | set_binfmt(&elf_fdpic_format); |
| 358 | |
| 359 | current->mm->start_code = 0; |
| 360 | current->mm->end_code = 0; |
| 361 | current->mm->start_stack = 0; |
| 362 | current->mm->start_data = 0; |
| 363 | current->mm->end_data = 0; |
| 364 | current->mm->context.exec_fdpic_loadmap = 0; |
| 365 | current->mm->context.interp_fdpic_loadmap = 0; |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | #ifdef CONFIG_MMU |
| 368 | elf_fdpic_arch_lay_out_mm(&exec_params, |
| 369 | &interp_params, |
| 370 | ¤t->mm->start_stack, |
| 371 | ¤t->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 373 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
| 374 | executable_stack); |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 375 | if (retval < 0) |
| 376 | goto error; |
Nicolas Pitre | 382e67a | 2017-08-11 00:53:39 -0400 | [diff] [blame] | 377 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
| 378 | retval = arch_setup_additional_pages(bprm, !!interpreter_name); |
| 379 | if (retval < 0) |
| 380 | goto error; |
| 381 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | #endif |
| 383 | |
| 384 | /* load the executable and interpreter into memory */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 385 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
| 386 | "executable"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (retval < 0) |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 388 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | if (interpreter_name) { |
| 391 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
| 392 | current->mm, "interpreter"); |
| 393 | if (retval < 0) { |
| 394 | printk(KERN_ERR "Unable to load interpreter\n"); |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 395 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | } |
| 397 | |
| 398 | allow_write_access(interpreter); |
| 399 | fput(interpreter); |
| 400 | interpreter = NULL; |
| 401 | } |
| 402 | |
| 403 | #ifdef CONFIG_MMU |
| 404 | if (!current->mm->start_brk) |
| 405 | current->mm->start_brk = current->mm->end_data; |
| 406 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 407 | current->mm->brk = current->mm->start_brk = |
| 408 | PAGE_ALIGN(current->mm->start_brk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | |
| 410 | #else |
Rich Felker | 4ac3131 | 2015-08-20 15:11:06 -0400 | [diff] [blame] | 411 | /* create a stack area and zero-size brk area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
| 413 | if (stack_size < PAGE_SIZE * 2) |
| 414 | stack_size = PAGE_SIZE * 2; |
| 415 | |
Mike Frysinger | 04e4f2b | 2010-01-06 17:23:17 +0000 | [diff] [blame] | 416 | stack_prot = PROT_READ | PROT_WRITE; |
| 417 | if (executable_stack == EXSTACK_ENABLE_X || |
| 418 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) |
| 419 | stack_prot |= PROT_EXEC; |
| 420 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 421 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, |
Jie Zhang | ea63763 | 2009-12-14 18:00:02 -0800 | [diff] [blame] | 422 | MAP_PRIVATE | MAP_ANONYMOUS | |
| 423 | MAP_UNINITIALIZED | MAP_GROWSDOWN, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | 0); |
| 425 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 426 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | retval = current->mm->start_brk; |
| 428 | current->mm->start_brk = 0; |
Al Viro | 19d860a | 2014-05-04 20:11:36 -0400 | [diff] [blame] | 429 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | current->mm->brk = current->mm->start_brk; |
| 433 | current->mm->context.end_brk = current->mm->start_brk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | current->mm->start_stack = current->mm->start_brk + stack_size; |
| 435 | #endif |
| 436 | |
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 | |
Kees Cook | b838383 | 2018-04-10 16:34:57 -0700 | [diff] [blame] | 461 | finalize_exec(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | /* everything is now ready... get the userspace context ready to roll */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 463 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
| 464 | start_thread(regs, entryaddr, current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | retval = 0; |
| 467 | |
| 468 | error: |
| 469 | if (interpreter) { |
| 470 | allow_write_access(interpreter); |
| 471 | fput(interpreter); |
| 472 | } |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 473 | kfree(interpreter_name); |
| 474 | kfree(exec_params.phdrs); |
| 475 | kfree(exec_params.loadmap); |
| 476 | kfree(interp_params.phdrs); |
| 477 | kfree(interp_params.loadmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | return retval; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 479 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | /*****************************************************************************/ |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 482 | |
| 483 | #ifndef ELF_BASE_PLATFORM |
| 484 | /* |
| 485 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
| 486 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
| 487 | * will be copied to the user stack in the same manner as AT_PLATFORM. |
| 488 | */ |
| 489 | #define ELF_BASE_PLATFORM NULL |
| 490 | #endif |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | /* |
Paul Mundt | c763794 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 493 | * present useful information to the program by shovelling it onto the new |
| 494 | * process's stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | */ |
| 496 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
| 497 | struct mm_struct *mm, |
| 498 | struct elf_fdpic_params *exec_params, |
| 499 | struct elf_fdpic_params *interp_params) |
| 500 | { |
David Howells | 86a264a | 2008-11-14 10:39:18 +1100 | [diff] [blame] | 501 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | unsigned long sp, csp, nitems; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 503 | elf_caddr_t __user *argv, *envp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | size_t platform_len = 0, len; |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 505 | char *k_platform, *k_base_platform; |
| 506 | char __user *u_platform, *u_base_platform, *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | int loop; |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 508 | int nr; /* reset for each csp adjustment */ |
Laurent Vivier | 2347961 | 2020-01-28 14:25:39 +0100 | [diff] [blame] | 509 | unsigned long flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | #ifdef CONFIG_MMU |
Paul Mundt | c763794 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 512 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
| 513 | * by the processes running on the same package. One thing we can do is |
| 514 | * to shuffle the initial stack for them, so we give the architecture |
| 515 | * an opportunity to do so here. |
| 516 | */ |
| 517 | sp = arch_align_stack(bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | #else |
| 519 | sp = mm->start_stack; |
| 520 | |
| 521 | /* stack the program arguments and environment */ |
Nicolas Pitre | 7e7ec6a | 2016-07-24 11:30:18 -0400 | [diff] [blame] | 522 | if (transfer_args_to_stack(bprm, &sp) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | return -EFAULT; |
Nicolas Pitre | 7e7ec6a | 2016-07-24 11:30:18 -0400 | [diff] [blame] | 524 | sp &= ~15; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | #endif |
| 526 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 527 | /* |
| 528 | * If this architecture has a platform capability string, copy it |
| 529 | * to userspace. In some cases (Sparc), this info is impossible |
| 530 | * for userspace to get any other way, in others (i386) it is |
| 531 | * merely difficult. |
| 532 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | k_platform = ELF_PLATFORM; |
David Howells | 1aeb21d | 2006-07-10 04:44:50 -0700 | [diff] [blame] | 534 | u_platform = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | if (k_platform) { |
| 537 | platform_len = strlen(k_platform) + 1; |
| 538 | sp -= platform_len; |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 539 | u_platform = (char __user *) sp; |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 540 | if (copy_to_user(u_platform, k_platform, platform_len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | return -EFAULT; |
| 542 | } |
| 543 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 544 | /* |
| 545 | * If this architecture has a "base" platform capability |
| 546 | * string, copy it to userspace. |
| 547 | */ |
| 548 | k_base_platform = ELF_BASE_PLATFORM; |
| 549 | u_base_platform = NULL; |
| 550 | |
| 551 | if (k_base_platform) { |
| 552 | platform_len = strlen(k_base_platform) + 1; |
| 553 | sp -= platform_len; |
| 554 | u_base_platform = (char __user *) sp; |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 555 | if (copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 556 | return -EFAULT; |
| 557 | } |
| 558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | sp &= ~7UL; |
| 560 | |
| 561 | /* stack the load map(s) */ |
| 562 | len = sizeof(struct elf32_fdpic_loadmap); |
| 563 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
| 564 | sp = (sp - len) & ~7UL; |
| 565 | exec_params->map_addr = sp; |
| 566 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 567 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | return -EFAULT; |
| 569 | |
| 570 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
| 571 | |
| 572 | if (interp_params->loadmap) { |
| 573 | len = sizeof(struct elf32_fdpic_loadmap); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 574 | len += sizeof(struct elf32_fdpic_loadseg) * |
| 575 | interp_params->loadmap->nsegs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | sp = (sp - len) & ~7UL; |
| 577 | interp_params->map_addr = sp; |
| 578 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 579 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
| 580 | len) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | return -EFAULT; |
| 582 | |
| 583 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
| 584 | } |
| 585 | |
| 586 | /* force 16 byte _final_ alignment here for generality */ |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 587 | #define DLINFO_ITEMS 15 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 589 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
| 590 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | |
Arnd Bergmann | 0115934 | 2020-05-27 15:49:01 +0200 | [diff] [blame] | 592 | if (bprm->have_execfd) |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 593 | nitems++; |
| 594 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | csp = sp; |
| 596 | sp -= nitems * 2 * sizeof(unsigned long); |
| 597 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
| 598 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
| 599 | sp -= 1 * sizeof(unsigned long); /* argc */ |
| 600 | |
| 601 | csp -= sp & 15UL; |
| 602 | sp -= sp & 15UL; |
| 603 | |
| 604 | /* put the ELF interpreter info on the stack */ |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 605 | #define NEW_AUX_ENT(id, val) \ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 606 | do { \ |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 607 | struct { unsigned long _id, _val; } __user *ent, v; \ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 608 | \ |
| 609 | ent = (void __user *) csp; \ |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 610 | v._id = (id); \ |
| 611 | v._val = (val); \ |
| 612 | if (copy_to_user(ent + nr, &v, sizeof(v))) \ |
| 613 | return -EFAULT; \ |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 614 | nr++; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } while (0) |
| 616 | |
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_NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | if (k_platform) { |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 621 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | csp -= 2 * sizeof(unsigned long); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 623 | NEW_AUX_ENT(AT_PLATFORM, |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 624 | (elf_addr_t) (unsigned long) u_platform); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |
| 626 | |
Paul Mundt | ec23847 | 2008-10-15 22:04:15 -0700 | [diff] [blame] | 627 | if (k_base_platform) { |
| 628 | nr = 0; |
| 629 | csp -= 2 * sizeof(unsigned long); |
| 630 | NEW_AUX_ENT(AT_BASE_PLATFORM, |
| 631 | (elf_addr_t) (unsigned long) u_base_platform); |
| 632 | } |
| 633 | |
Eric W. Biederman | b8a61c9 | 2020-05-14 15:17:40 -0500 | [diff] [blame] | 634 | if (bprm->have_execfd) { |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 635 | nr = 0; |
| 636 | csp -= 2 * sizeof(unsigned long); |
Eric W. Biederman | b8a61c9 | 2020-05-14 15:17:40 -0500 | [diff] [blame] | 637 | NEW_AUX_ENT(AT_EXECFD, bprm->execfd); |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 638 | } |
| 639 | |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 640 | nr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
Michael Neuling | 2171364 | 2013-04-17 17:33:11 +0000 | [diff] [blame] | 642 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
| 643 | #ifdef ELF_HWCAP2 |
| 644 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); |
| 645 | #endif |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 646 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
| 647 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
| 648 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
| 649 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
| 650 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
| 651 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
Laurent Vivier | 2347961 | 2020-01-28 14:25:39 +0100 | [diff] [blame] | 652 | if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0) |
| 653 | flags |= AT_FLAGS_PRESERVE_ARGV0; |
| 654 | NEW_AUX_ENT(AT_FLAGS, flags); |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 655 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
Eric W. Biederman | ebc887b | 2012-02-07 18:36:10 -0800 | [diff] [blame] | 656 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); |
| 657 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); |
| 658 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); |
| 659 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); |
Kees Cook | c425e18 | 2017-07-18 15:25:22 -0700 | [diff] [blame] | 660 | NEW_AUX_ENT(AT_SECURE, bprm->secureexec); |
Paul Mundt | 5edc2a5 | 2008-10-15 22:04:16 -0700 | [diff] [blame] | 661 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
| 663 | #ifdef ARCH_DLINFO |
Paul Mundt | 9b14ec3 | 2008-05-19 13:34:45 +0900 | [diff] [blame] | 664 | nr = 0; |
| 665 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | /* ARCH_DLINFO must come last so platform specific code can enforce |
| 668 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
| 669 | */ |
| 670 | ARCH_DLINFO; |
| 671 | #endif |
| 672 | #undef NEW_AUX_ENT |
| 673 | |
| 674 | /* allocate room for argv[] and envv[] */ |
| 675 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 676 | envp = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 678 | argv = (elf_caddr_t __user *) csp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
| 680 | /* stack argc */ |
| 681 | csp -= sizeof(unsigned long); |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 682 | if (put_user(bprm->argc, (unsigned long __user *) csp)) |
| 683 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Eric Sesterhenn | 88bcd51 | 2006-03-24 18:38:48 +0100 | [diff] [blame] | 685 | BUG_ON(csp != sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | |
| 687 | /* fill in the argv[] array */ |
| 688 | #ifdef CONFIG_MMU |
| 689 | current->mm->arg_start = bprm->p; |
| 690 | #else |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 691 | current->mm->arg_start = current->mm->start_stack - |
| 692 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | #endif |
| 694 | |
Al Viro | 530018b | 2006-06-23 02:04:05 -0700 | [diff] [blame] | 695 | p = (char __user *) current->mm->arg_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | for (loop = bprm->argc; loop > 0; loop--) { |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 697 | if (put_user((elf_caddr_t) p, argv++)) |
| 698 | return -EFAULT; |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 699 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 700 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | return -EINVAL; |
| 702 | p += len; |
| 703 | } |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 704 | if (put_user(NULL, argv)) |
| 705 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | current->mm->arg_end = (unsigned long) p; |
| 707 | |
| 708 | /* fill in the envv[] array */ |
| 709 | current->mm->env_start = (unsigned long) p; |
| 710 | for (loop = bprm->envc; loop > 0; loop--) { |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 711 | if (put_user((elf_caddr_t)(unsigned long) p, envp++)) |
| 712 | return -EFAULT; |
Ollie Wild | b6a2fea | 2007-07-19 01:48:16 -0700 | [diff] [blame] | 713 | len = strnlen_user(p, MAX_ARG_STRLEN); |
| 714 | if (!len || len > MAX_ARG_STRLEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | return -EINVAL; |
| 716 | p += len; |
| 717 | } |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 718 | if (put_user(NULL, envp)) |
| 719 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | current->mm->env_end = (unsigned long) p; |
| 721 | |
| 722 | mm->start_stack = (unsigned long) sp; |
| 723 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 724 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | /*****************************************************************************/ |
| 727 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | * load the appropriate binary image (executable or interpreter) into memory |
| 729 | * - we assume no MMU is available |
| 730 | * - if no other PIC bits are set in params->hdr->e_flags |
| 731 | * - we assume that the LOADable segments in the binary are independently relocatable |
| 732 | * - we assume R/O executable segments are shareable |
| 733 | * - else |
| 734 | * - we assume the loadable parts of the image to require fixed displacement |
| 735 | * - the image is not shareable |
| 736 | */ |
| 737 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
| 738 | struct file *file, |
| 739 | struct mm_struct *mm, |
| 740 | const char *what) |
| 741 | { |
| 742 | struct elf32_fdpic_loadmap *loadmap; |
| 743 | #ifdef CONFIG_MMU |
| 744 | struct elf32_fdpic_loadseg *mseg; |
| 745 | #endif |
| 746 | struct elf32_fdpic_loadseg *seg; |
| 747 | struct elf32_phdr *phdr; |
| 748 | unsigned long load_addr, stop; |
| 749 | unsigned nloads, tmp; |
| 750 | size_t size; |
| 751 | int loop, ret; |
| 752 | |
| 753 | /* allocate a load map table */ |
| 754 | nloads = 0; |
| 755 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
| 756 | if (params->phdrs[loop].p_type == PT_LOAD) |
| 757 | nloads++; |
| 758 | |
| 759 | if (nloads == 0) |
| 760 | return -ELIBBAD; |
| 761 | |
| 762 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
Robert P. J. Day | b87576d | 2006-12-12 20:07:35 +0100 | [diff] [blame] | 763 | loadmap = kzalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | if (!loadmap) |
| 765 | return -ENOMEM; |
| 766 | |
| 767 | params->loadmap = loadmap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
| 770 | loadmap->nsegs = nloads; |
| 771 | |
| 772 | load_addr = params->load_addr; |
| 773 | seg = loadmap->segs; |
| 774 | |
| 775 | /* map the requested LOADs into the memory space */ |
| 776 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 777 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 778 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 779 | #ifndef CONFIG_MMU |
| 780 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
| 781 | if (ret < 0) |
| 782 | return ret; |
| 783 | break; |
| 784 | #endif |
| 785 | default: |
| 786 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
| 787 | if (ret < 0) |
| 788 | return ret; |
| 789 | break; |
| 790 | } |
| 791 | |
| 792 | /* map the entry point */ |
| 793 | if (params->hdr.e_entry) { |
| 794 | seg = loadmap->segs; |
| 795 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 796 | if (params->hdr.e_entry >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 797 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | params->entry_addr = |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 799 | (params->hdr.e_entry - seg->p_vaddr) + |
| 800 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | break; |
| 802 | } |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | /* determine where the program header table has wound up if mapped */ |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 807 | stop = params->hdr.e_phoff; |
| 808 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | phdr = params->phdrs; |
| 810 | |
| 811 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 812 | if (phdr->p_type != PT_LOAD) |
| 813 | continue; |
| 814 | |
| 815 | if (phdr->p_offset > params->hdr.e_phoff || |
| 816 | phdr->p_offset + phdr->p_filesz < stop) |
| 817 | continue; |
| 818 | |
| 819 | seg = loadmap->segs; |
| 820 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 821 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 822 | phdr->p_vaddr + phdr->p_filesz <= |
| 823 | seg->p_vaddr + seg->p_memsz) { |
| 824 | params->ph_addr = |
| 825 | (phdr->p_vaddr - seg->p_vaddr) + |
| 826 | seg->addr + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | params->hdr.e_phoff - phdr->p_offset; |
| 828 | break; |
| 829 | } |
| 830 | } |
| 831 | break; |
| 832 | } |
| 833 | |
| 834 | /* determine where the dynamic section has wound up if there is one */ |
| 835 | phdr = params->phdrs; |
| 836 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 837 | if (phdr->p_type != PT_DYNAMIC) |
| 838 | continue; |
| 839 | |
| 840 | seg = loadmap->segs; |
| 841 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
| 842 | if (phdr->p_vaddr >= seg->p_vaddr && |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 843 | phdr->p_vaddr + phdr->p_memsz <= |
| 844 | seg->p_vaddr + seg->p_memsz) { |
Nicolas Pitre | cdf3888 | 2017-08-16 18:56:14 -0400 | [diff] [blame] | 845 | Elf32_Dyn __user *dyn; |
| 846 | Elf32_Sword d_tag; |
| 847 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 848 | params->dynamic_addr = |
| 849 | (phdr->p_vaddr - seg->p_vaddr) + |
| 850 | seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 852 | /* check the dynamic section contains at least |
| 853 | * one item, and that the last item is a NULL |
| 854 | * entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | if (phdr->p_memsz == 0 || |
| 856 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
| 857 | goto dynamic_error; |
| 858 | |
| 859 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
Nicolas Pitre | cdf3888 | 2017-08-16 18:56:14 -0400 | [diff] [blame] | 860 | dyn = (Elf32_Dyn __user *)params->dynamic_addr; |
Al Viro | 0abb013 | 2020-02-19 09:28:34 -0500 | [diff] [blame] | 861 | if (get_user(d_tag, &dyn[tmp - 1].d_tag) || |
| 862 | d_tag != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | goto dynamic_error; |
| 864 | break; |
| 865 | } |
| 866 | } |
| 867 | break; |
| 868 | } |
| 869 | |
| 870 | /* now elide adjacent segments in the load map on MMU linux |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 871 | * - on uClinux the holes between may actually be filled with system |
| 872 | * stuff or stuff from other processes |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | */ |
| 874 | #ifdef CONFIG_MMU |
| 875 | nloads = loadmap->nsegs; |
| 876 | mseg = loadmap->segs; |
| 877 | seg = mseg + 1; |
| 878 | for (loop = 1; loop < nloads; loop++) { |
| 879 | /* see if we have a candidate for merging */ |
| 880 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
| 881 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
| 882 | if (load_addr == (seg->addr & PAGE_MASK)) { |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 883 | mseg->p_memsz += |
| 884 | load_addr - |
| 885 | (mseg->addr + mseg->p_memsz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
| 887 | mseg->p_memsz += seg->p_memsz; |
| 888 | loadmap->nsegs--; |
| 889 | continue; |
| 890 | } |
| 891 | } |
| 892 | |
| 893 | mseg++; |
| 894 | if (mseg != seg) |
| 895 | *mseg = *seg; |
| 896 | } |
| 897 | #endif |
| 898 | |
| 899 | kdebug("Mapped Object [%s]:", what); |
| 900 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
| 901 | kdebug("- entry : %lx", params->entry_addr); |
| 902 | kdebug("- PHDR[] : %lx", params->ph_addr); |
| 903 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
| 904 | seg = loadmap->segs; |
| 905 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
| 906 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
| 907 | loop, |
| 908 | seg->addr, seg->addr + seg->p_memsz - 1, |
| 909 | seg->p_vaddr, seg->p_memsz); |
| 910 | |
| 911 | return 0; |
| 912 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 913 | dynamic_error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 915 | what, file_inode(file)->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | return -ELIBBAD; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 917 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
| 919 | /*****************************************************************************/ |
| 920 | /* |
| 921 | * map a file with constant displacement under uClinux |
| 922 | */ |
| 923 | #ifndef CONFIG_MMU |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 924 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
| 925 | struct elf_fdpic_params *params, |
| 926 | struct file *file, |
| 927 | struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
| 929 | struct elf32_fdpic_loadseg *seg; |
| 930 | struct elf32_phdr *phdr; |
David Hildenbrand | a4eec6a | 2021-06-28 19:38:31 -0700 | [diff] [blame] | 931 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | int loop, ret; |
| 933 | |
| 934 | load_addr = params->load_addr; |
| 935 | seg = params->loadmap->segs; |
| 936 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 937 | /* determine the bounds of the contiguous overall allocation we must |
| 938 | * make */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | phdr = params->phdrs; |
| 940 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 941 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 942 | continue; |
| 943 | |
| 944 | if (base > phdr->p_vaddr) |
| 945 | base = phdr->p_vaddr; |
| 946 | if (top < phdr->p_vaddr + phdr->p_memsz) |
| 947 | top = phdr->p_vaddr + phdr->p_memsz; |
| 948 | } |
| 949 | |
| 950 | /* allocate one big anon block for everything */ |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 951 | maddr = vm_mmap(NULL, load_addr, top - base, |
David Hildenbrand | a4eec6a | 2021-06-28 19:38:31 -0700 | [diff] [blame] | 952 | PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, 0); |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 953 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | return (int) maddr; |
| 955 | |
| 956 | if (load_addr != 0) |
| 957 | load_addr += PAGE_ALIGN(top - base); |
| 958 | |
| 959 | /* and then load the file segments into it */ |
| 960 | phdr = params->phdrs; |
| 961 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 962 | if (params->phdrs[loop].p_type != PT_LOAD) |
| 963 | continue; |
| 964 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | seg->addr = maddr + (phdr->p_vaddr - base); |
| 966 | seg->p_vaddr = phdr->p_vaddr; |
| 967 | seg->p_memsz = phdr->p_memsz; |
| 968 | |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 969 | ret = read_code(file, seg->addr, phdr->p_offset, |
| 970 | phdr->p_filesz); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | if (ret < 0) |
| 972 | return ret; |
| 973 | |
| 974 | /* map the ELF header address if in this segment */ |
| 975 | if (phdr->p_offset == 0) |
| 976 | params->elfhdr_addr = seg->addr; |
| 977 | |
| 978 | /* clear any space allocated but not loaded */ |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 979 | if (phdr->p_filesz < phdr->p_memsz) { |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 980 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
| 981 | phdr->p_memsz - phdr->p_filesz)) |
| 982 | return -EFAULT; |
Mike Frysinger | ab4ad55 | 2009-04-02 16:58:28 -0700 | [diff] [blame] | 983 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | |
| 985 | if (mm) { |
| 986 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 987 | if (!mm->start_code) { |
| 988 | mm->start_code = seg->addr; |
| 989 | mm->end_code = seg->addr + |
| 990 | phdr->p_memsz; |
| 991 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 992 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | mm->start_data = seg->addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | mm->end_data = seg->addr + phdr->p_memsz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | seg++; |
| 999 | } |
| 1000 | |
| 1001 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1002 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | #endif |
| 1004 | |
| 1005 | /*****************************************************************************/ |
| 1006 | /* |
| 1007 | * map a binary by direct mmap() of the individual PT_LOAD segments |
| 1008 | */ |
| 1009 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
| 1010 | struct file *file, |
| 1011 | struct mm_struct *mm) |
| 1012 | { |
| 1013 | struct elf32_fdpic_loadseg *seg; |
| 1014 | struct elf32_phdr *phdr; |
| 1015 | unsigned long load_addr, delta_vaddr; |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1016 | int loop, dvset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | |
| 1018 | load_addr = params->load_addr; |
| 1019 | delta_vaddr = 0; |
| 1020 | dvset = 0; |
| 1021 | |
| 1022 | seg = params->loadmap->segs; |
| 1023 | |
| 1024 | /* deal with each load segment separately */ |
| 1025 | phdr = params->phdrs; |
| 1026 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
| 1027 | unsigned long maddr, disp, excess, excess1; |
| 1028 | int prot = 0, flags; |
| 1029 | |
| 1030 | if (phdr->p_type != PT_LOAD) |
| 1031 | continue; |
| 1032 | |
| 1033 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
| 1034 | (unsigned long) phdr->p_vaddr, |
| 1035 | (unsigned long) phdr->p_offset, |
| 1036 | (unsigned long) phdr->p_filesz, |
| 1037 | (unsigned long) phdr->p_memsz); |
| 1038 | |
| 1039 | /* determine the mapping parameters */ |
| 1040 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
| 1041 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
| 1042 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
| 1043 | |
David Hildenbrand | 4589ff7 | 2021-04-23 09:42:41 +0200 | [diff] [blame] | 1044 | flags = MAP_PRIVATE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | maddr = 0; |
| 1046 | |
| 1047 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
| 1048 | case ELF_FDPIC_FLAG_INDEPENDENT: |
| 1049 | /* PT_LOADs are independently locatable */ |
| 1050 | break; |
| 1051 | |
| 1052 | case ELF_FDPIC_FLAG_HONOURVADDR: |
| 1053 | /* the specified virtual address must be honoured */ |
| 1054 | maddr = phdr->p_vaddr; |
| 1055 | flags |= MAP_FIXED; |
| 1056 | break; |
| 1057 | |
| 1058 | case ELF_FDPIC_FLAG_CONSTDISP: |
| 1059 | /* constant displacement |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1060 | * - can be mapped anywhere, but must be mapped as a |
| 1061 | * unit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | */ |
| 1063 | if (!dvset) { |
| 1064 | maddr = load_addr; |
| 1065 | delta_vaddr = phdr->p_vaddr; |
| 1066 | dvset = 1; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1067 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
| 1069 | flags |= MAP_FIXED; |
| 1070 | } |
| 1071 | break; |
| 1072 | |
| 1073 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
| 1074 | /* contiguity handled later */ |
| 1075 | break; |
| 1076 | |
| 1077 | default: |
| 1078 | BUG(); |
| 1079 | } |
| 1080 | |
| 1081 | maddr &= PAGE_MASK; |
| 1082 | |
| 1083 | /* create the mapping */ |
| 1084 | disp = phdr->p_vaddr & ~PAGE_MASK; |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 1085 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | phdr->p_offset - disp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | |
| 1088 | 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] | 1089 | loop, phdr->p_memsz + disp, prot, flags, |
| 1090 | phdr->p_offset - disp, maddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1092 | if (IS_ERR_VALUE(maddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | return (int) maddr; |
| 1094 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1095 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
| 1096 | ELF_FDPIC_FLAG_CONTIGUOUS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
| 1098 | |
| 1099 | seg->addr = maddr + disp; |
| 1100 | seg->p_vaddr = phdr->p_vaddr; |
| 1101 | seg->p_memsz = phdr->p_memsz; |
| 1102 | |
| 1103 | /* map the ELF header address if in this segment */ |
| 1104 | if (phdr->p_offset == 0) |
| 1105 | params->elfhdr_addr = seg->addr; |
| 1106 | |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1107 | /* clear the bit between beginning of mapping and beginning of |
| 1108 | * PT_LOAD */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | if (prot & PROT_WRITE && disp > 0) { |
| 1110 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1111 | if (clear_user((void __user *) maddr, disp)) |
| 1112 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | maddr += disp; |
| 1114 | } |
| 1115 | |
| 1116 | /* clear any space allocated but not loaded |
| 1117 | * - on uClinux we can just clear the lot |
| 1118 | * - on MMU linux we'll get a SIGBUS beyond the last page |
| 1119 | * extant in the file |
| 1120 | */ |
| 1121 | excess = phdr->p_memsz - phdr->p_filesz; |
| 1122 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
| 1123 | |
| 1124 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | if (excess > excess1) { |
| 1126 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
| 1127 | unsigned long xmaddr; |
| 1128 | |
| 1129 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 1130 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1, |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1131 | prot, flags, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
| 1133 | kdebug("mmap[%d] <anon>" |
| 1134 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1135 | loop, xaddr, excess - excess1, prot, flags, |
| 1136 | xmaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | |
| 1138 | if (xmaddr != xaddr) |
| 1139 | return -ENOMEM; |
| 1140 | } |
| 1141 | |
| 1142 | if (prot & PROT_WRITE && excess1 > 0) { |
| 1143 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1144 | loop, maddr + phdr->p_filesz, excess1); |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1145 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
| 1146 | excess1)) |
| 1147 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | } |
| 1149 | |
| 1150 | #else |
| 1151 | if (excess > 0) { |
| 1152 | kdebug("clear[%d] ad=%lx sz=%lx", |
| 1153 | loop, maddr + phdr->p_filesz, excess); |
Takuya Yoshikawa | e30c7c3 | 2010-06-01 14:10:47 +0100 | [diff] [blame] | 1154 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
| 1155 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1156 | } |
| 1157 | #endif |
| 1158 | |
| 1159 | if (mm) { |
| 1160 | if (phdr->p_flags & PF_X) { |
David Howells | aa289b4 | 2007-03-23 00:10:00 -0700 | [diff] [blame] | 1161 | if (!mm->start_code) { |
| 1162 | mm->start_code = maddr; |
| 1163 | mm->end_code = maddr + phdr->p_memsz; |
| 1164 | } |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1165 | } else if (!mm->start_data) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | mm->start_data = maddr; |
| 1167 | mm->end_data = maddr + phdr->p_memsz; |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | seg++; |
| 1172 | } |
| 1173 | |
| 1174 | return 0; |
David Howells | 8a2ab7f | 2006-07-10 04:44:53 -0700 | [diff] [blame] | 1175 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1176 | |
| 1177 | /*****************************************************************************/ |
| 1178 | /* |
| 1179 | * ELF-FDPIC core dumper |
| 1180 | * |
| 1181 | * Modelled on fs/exec.c:aout_core_dump() |
| 1182 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
| 1183 | * |
| 1184 | * Modelled on fs/binfmt_elf.c core dumper |
| 1185 | */ |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 1186 | #ifdef CONFIG_ELF_CORE |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1187 | |
Al Viro | 16aead8 | 2020-06-14 09:52:06 -0400 | [diff] [blame] | 1188 | struct elf_prstatus_fdpic |
| 1189 | { |
Al Viro | f2485a2 | 2020-06-13 00:08:44 -0400 | [diff] [blame] | 1190 | struct elf_prstatus_common common; |
Al Viro | 16aead8 | 2020-06-14 09:52:06 -0400 | [diff] [blame] | 1191 | elf_gregset_t pr_reg; /* GP registers */ |
| 1192 | /* When using FDPIC, the loadmap addresses need to be communicated |
| 1193 | * to GDB in order for GDB to do the necessary relocations. The |
| 1194 | * fields (below) used to communicate this information are placed |
| 1195 | * immediately after ``pr_reg'', so that the loadmap addresses may |
| 1196 | * be viewed as part of the register set if so desired. |
| 1197 | */ |
| 1198 | unsigned long pr_exec_fdpic_loadmap; |
| 1199 | unsigned long pr_interp_fdpic_loadmap; |
| 1200 | int pr_fpvalid; /* True if math co-processor being used. */ |
| 1201 | }; |
| 1202 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1203 | /* An ELF note in memory */ |
| 1204 | struct memelfnote |
| 1205 | { |
| 1206 | const char *name; |
| 1207 | int type; |
| 1208 | unsigned int datasz; |
| 1209 | void *data; |
| 1210 | }; |
| 1211 | |
| 1212 | static int notesize(struct memelfnote *en) |
| 1213 | { |
| 1214 | int sz; |
| 1215 | |
| 1216 | sz = sizeof(struct elf_note); |
| 1217 | sz += roundup(strlen(en->name) + 1, 4); |
| 1218 | sz += roundup(en->datasz, 4); |
| 1219 | |
| 1220 | return sz; |
| 1221 | } |
| 1222 | |
| 1223 | /* #define DEBUG */ |
| 1224 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1225 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1226 | { |
| 1227 | struct elf_note en; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1228 | en.n_namesz = strlen(men->name) + 1; |
| 1229 | en.n_descsz = men->datasz; |
| 1230 | en.n_type = men->type; |
| 1231 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1232 | return dump_emit(cprm, &en, sizeof(en)) && |
Al Viro | 22a8cb8 | 2013-10-08 11:05:01 -0400 | [diff] [blame] | 1233 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
| 1234 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1235 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1236 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1237 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
| 1238 | { |
| 1239 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
| 1240 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
| 1241 | elf->e_ident[EI_DATA] = ELF_DATA; |
| 1242 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
| 1243 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
| 1244 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
| 1245 | |
| 1246 | elf->e_type = ET_CORE; |
| 1247 | elf->e_machine = ELF_ARCH; |
| 1248 | elf->e_version = EV_CURRENT; |
| 1249 | elf->e_entry = 0; |
| 1250 | elf->e_phoff = sizeof(struct elfhdr); |
| 1251 | elf->e_shoff = 0; |
| 1252 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
| 1253 | elf->e_ehsize = sizeof(struct elfhdr); |
| 1254 | elf->e_phentsize = sizeof(struct elf_phdr); |
| 1255 | elf->e_phnum = segs; |
| 1256 | elf->e_shentsize = 0; |
| 1257 | elf->e_shnum = 0; |
| 1258 | elf->e_shstrndx = 0; |
| 1259 | return; |
| 1260 | } |
| 1261 | |
| 1262 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
| 1263 | { |
| 1264 | phdr->p_type = PT_NOTE; |
| 1265 | phdr->p_offset = offset; |
| 1266 | phdr->p_vaddr = 0; |
| 1267 | phdr->p_paddr = 0; |
| 1268 | phdr->p_filesz = sz; |
| 1269 | phdr->p_memsz = 0; |
| 1270 | phdr->p_flags = 0; |
| 1271 | phdr->p_align = 0; |
| 1272 | return; |
| 1273 | } |
| 1274 | |
| 1275 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
| 1276 | unsigned int sz, void *data) |
| 1277 | { |
| 1278 | note->name = name; |
| 1279 | note->type = type; |
| 1280 | note->datasz = sz; |
| 1281 | note->data = data; |
| 1282 | return; |
| 1283 | } |
| 1284 | |
| 1285 | /* |
| 1286 | * 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] | 1287 | * registers which need to be filled up separately. |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1288 | */ |
Al Viro | f2485a2 | 2020-06-13 00:08:44 -0400 | [diff] [blame] | 1289 | static void fill_prstatus(struct elf_prstatus_common *prstatus, |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1290 | struct task_struct *p, long signr) |
| 1291 | { |
| 1292 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
| 1293 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
| 1294 | prstatus->pr_sighold = p->blocked.sig[0]; |
Oleg Nesterov | 3b34fc5 | 2009-06-17 16:27:38 -0700 | [diff] [blame] | 1295 | rcu_read_lock(); |
| 1296 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
| 1297 | rcu_read_unlock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1298 | prstatus->pr_pid = task_pid_vnr(p); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1299 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
| 1300 | prstatus->pr_sid = task_session_vnr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1301 | if (thread_group_leader(p)) { |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1302 | struct task_cputime cputime; |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1303 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1304 | /* |
Paul Mundt | 2515ddc | 2008-10-21 12:07:40 +0900 | [diff] [blame] | 1305 | * This is the record for the group leader. It shows the |
| 1306 | * group-wide total, not its individual thread total. |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1307 | */ |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1308 | thread_group_cputime(p, &cputime); |
Arnd Bergmann | e2bb80d | 2017-11-23 13:46:33 +0100 | [diff] [blame] | 1309 | prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime); |
| 1310 | prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1311 | } else { |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1312 | u64 utime, stime; |
Frederic Weisbecker | 6fac482 | 2012-11-13 14:20:55 +0100 | [diff] [blame] | 1313 | |
Frederic Weisbecker | cd19c36 | 2017-01-31 04:09:27 +0100 | [diff] [blame] | 1314 | task_cputime(p, &utime, &stime); |
Arnd Bergmann | e2bb80d | 2017-11-23 13:46:33 +0100 | [diff] [blame] | 1315 | prstatus->pr_utime = ns_to_kernel_old_timeval(utime); |
| 1316 | prstatus->pr_stime = ns_to_kernel_old_timeval(stime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1317 | } |
Arnd Bergmann | e2bb80d | 2017-11-23 13:46:33 +0100 | [diff] [blame] | 1318 | prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime); |
| 1319 | prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1320 | } |
| 1321 | |
| 1322 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
| 1323 | struct mm_struct *mm) |
| 1324 | { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1325 | const struct cred *cred; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1326 | unsigned int i, len; |
Peter Zijlstra | 2f064a5 | 2021-06-11 10:28:17 +0200 | [diff] [blame] | 1327 | unsigned int state; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1328 | |
| 1329 | /* first copy the parameters from user space */ |
| 1330 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
| 1331 | |
| 1332 | len = mm->arg_end - mm->arg_start; |
| 1333 | if (len >= ELF_PRARGSZ) |
| 1334 | len = ELF_PRARGSZ - 1; |
| 1335 | if (copy_from_user(&psinfo->pr_psargs, |
| 1336 | (const char __user *) mm->arg_start, len)) |
| 1337 | return -EFAULT; |
| 1338 | for (i = 0; i < len; i++) |
| 1339 | if (psinfo->pr_psargs[i] == 0) |
| 1340 | psinfo->pr_psargs[i] = ' '; |
| 1341 | psinfo->pr_psargs[len] = 0; |
| 1342 | |
Oleg Nesterov | 3b34fc5 | 2009-06-17 16:27:38 -0700 | [diff] [blame] | 1343 | rcu_read_lock(); |
| 1344 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
| 1345 | rcu_read_unlock(); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1346 | psinfo->pr_pid = task_pid_vnr(p); |
Pavel Emelyanov | b488893 | 2007-10-18 23:40:14 -0700 | [diff] [blame] | 1347 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
| 1348 | psinfo->pr_sid = task_session_vnr(p); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1349 | |
Peter Zijlstra | 2f064a5 | 2021-06-11 10:28:17 +0200 | [diff] [blame] | 1350 | state = READ_ONCE(p->__state); |
| 1351 | i = state ? ffz(~state) + 1 : 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1352 | psinfo->pr_state = i; |
| 1353 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
| 1354 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
| 1355 | psinfo->pr_nice = task_nice(p); |
| 1356 | psinfo->pr_flag = p->flags; |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1357 | rcu_read_lock(); |
| 1358 | cred = __task_cred(p); |
Eric W. Biederman | ebc887b | 2012-02-07 18:36:10 -0800 | [diff] [blame] | 1359 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
| 1360 | 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] | 1361 | rcu_read_unlock(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1362 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
| 1363 | |
| 1364 | return 0; |
| 1365 | } |
| 1366 | |
| 1367 | /* Here is the structure in which status of each thread is captured. */ |
| 1368 | struct elf_thread_status |
| 1369 | { |
Al Viro | 5074c7f | 2020-06-15 10:19:31 -0400 | [diff] [blame] | 1370 | struct elf_thread_status *next; |
Al Viro | 16aead8 | 2020-06-14 09:52:06 -0400 | [diff] [blame] | 1371 | struct elf_prstatus_fdpic prstatus; /* NT_PRSTATUS */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1372 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
Al Viro | 1697a32 | 2020-06-15 11:22:55 -0400 | [diff] [blame] | 1373 | struct memelfnote notes[2]; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1374 | int num_notes; |
| 1375 | }; |
| 1376 | |
| 1377 | /* |
| 1378 | * In order to add the specific thread information for the elf file format, |
| 1379 | * we need to keep a linked list of every thread's pr_status and then create |
| 1380 | * a single section for them in the final core file. |
| 1381 | */ |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1382 | static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1383 | { |
Al Viro | 1697a32 | 2020-06-15 11:22:55 -0400 | [diff] [blame] | 1384 | const struct user_regset_view *view = task_user_regset_view(p); |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1385 | struct elf_thread_status *t; |
Al Viro | 1697a32 | 2020-06-15 11:22:55 -0400 | [diff] [blame] | 1386 | int i, ret; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1387 | |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1388 | t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL); |
| 1389 | if (!t) |
| 1390 | return t; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1391 | |
Al Viro | f2485a2 | 2020-06-13 00:08:44 -0400 | [diff] [blame] | 1392 | fill_prstatus(&t->prstatus.common, p, signr); |
| 1393 | t->prstatus.pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
| 1394 | t->prstatus.pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
Al Viro | 1697a32 | 2020-06-15 11:22:55 -0400 | [diff] [blame] | 1395 | regset_get(p, &view->regsets[0], |
| 1396 | sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1397 | |
| 1398 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
| 1399 | &t->prstatus); |
| 1400 | t->num_notes++; |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1401 | *sz += notesize(&t->notes[0]); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1402 | |
Al Viro | 1697a32 | 2020-06-15 11:22:55 -0400 | [diff] [blame] | 1403 | for (i = 1; i < view->n; ++i) { |
| 1404 | const struct user_regset *regset = &view->regsets[i]; |
| 1405 | if (regset->core_note_type != NT_PRFPREG) |
| 1406 | continue; |
| 1407 | if (regset->active && regset->active(p, regset) <= 0) |
| 1408 | continue; |
| 1409 | ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu); |
| 1410 | if (ret >= 0) |
| 1411 | t->prstatus.pr_fpvalid = 1; |
| 1412 | break; |
| 1413 | } |
| 1414 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1415 | if (t->prstatus.pr_fpvalid) { |
| 1416 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
| 1417 | &t->fpu); |
| 1418 | t->num_notes++; |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1419 | *sz += notesize(&t->notes[1]); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1420 | } |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1421 | return t; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1422 | } |
| 1423 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1424 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
| 1425 | elf_addr_t e_shoff, int segs) |
| 1426 | { |
| 1427 | elf->e_shoff = e_shoff; |
| 1428 | elf->e_shentsize = sizeof(*shdr4extnum); |
| 1429 | elf->e_shnum = 1; |
| 1430 | elf->e_shstrndx = SHN_UNDEF; |
| 1431 | |
| 1432 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); |
| 1433 | |
| 1434 | shdr4extnum->sh_type = SHT_NULL; |
| 1435 | shdr4extnum->sh_size = elf->e_shnum; |
| 1436 | shdr4extnum->sh_link = elf->e_shstrndx; |
| 1437 | shdr4extnum->sh_info = segs; |
| 1438 | } |
| 1439 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1440 | /* |
| 1441 | * dump the segments for an MMU process |
| 1442 | */ |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1443 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm, |
| 1444 | struct core_vma_metadata *vma_meta, |
| 1445 | int vma_count) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1446 | { |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1447 | int i; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1448 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1449 | for (i = 0; i < vma_count; i++) { |
| 1450 | struct core_vma_metadata *meta = vma_meta + i; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1451 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1452 | if (!dump_user_range(cprm, meta->start, meta->dump_size)) |
Jann Horn | afc63a97b | 2020-10-15 20:12:46 -0700 | [diff] [blame] | 1453 | return false; |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1454 | } |
| 1455 | return true; |
| 1456 | } |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1457 | |
| 1458 | /* |
| 1459 | * Actual dumper |
| 1460 | * |
| 1461 | * This is a two-pass process; first we find the offsets of the bits, |
| 1462 | * and then they are actually written out. If we run out of core limit |
| 1463 | * we just truncate. |
| 1464 | */ |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 1465 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1466 | { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1467 | int has_dumped = 0; |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1468 | int vma_count, segs; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1469 | int i; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1470 | struct elfhdr *elf = NULL; |
Al Viro | 9b56d54 | 2013-10-08 09:26:08 -0400 | [diff] [blame] | 1471 | loff_t offset = 0, dataoff; |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1472 | struct memelfnote psinfo_note, auxv_note; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1473 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
Al Viro | 5074c7f | 2020-06-15 10:19:31 -0400 | [diff] [blame] | 1474 | struct elf_thread_status *thread_list = NULL; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1475 | int thread_status_size = 0; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1476 | elf_addr_t *auxv; |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1477 | struct elf_phdr *phdr4note = NULL; |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1478 | struct elf_shdr *shdr4extnum = NULL; |
| 1479 | Elf_Half e_phnum; |
| 1480 | elf_addr_t e_shoff; |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1481 | struct core_thread *ct; |
| 1482 | struct elf_thread_status *tmp; |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1483 | struct core_vma_metadata *vma_meta = NULL; |
| 1484 | size_t vma_data_size; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1485 | |
| 1486 | /* alloc memory for large data structures: too large to be on stack */ |
| 1487 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
| 1488 | if (!elf) |
Christoph Hellwig | 38cdabb | 2020-05-05 12:12:56 +0200 | [diff] [blame] | 1489 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1490 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
| 1491 | if (!psinfo) |
Christoph Hellwig | 38cdabb | 2020-05-05 12:12:56 +0200 | [diff] [blame] | 1492 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1493 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1494 | if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size)) |
| 1495 | goto end_coredump; |
| 1496 | |
Eric W. Biederman | 0258b5f | 2021-09-22 11:24:02 -0500 | [diff] [blame] | 1497 | for (ct = current->signal->core_state->dumper.next; |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1498 | ct; ct = ct->next) { |
Al Viro | 38a6277 | 2020-06-15 10:41:08 -0400 | [diff] [blame] | 1499 | tmp = elf_dump_thread_status(cprm->siginfo->si_signo, |
| 1500 | ct->task, &thread_status_size); |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1501 | if (!tmp) |
Christoph Hellwig | 38cdabb | 2020-05-05 12:12:56 +0200 | [diff] [blame] | 1502 | goto end_coredump; |
Al Viro | afabada | 2013-10-14 07:39:56 -0400 | [diff] [blame] | 1503 | |
Al Viro | 5074c7f | 2020-06-15 10:19:31 -0400 | [diff] [blame] | 1504 | tmp->next = thread_list; |
| 1505 | thread_list = tmp; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1506 | } |
| 1507 | |
| 1508 | /* now collect the dump for the current */ |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1509 | tmp = elf_dump_thread_status(cprm->siginfo->si_signo, |
| 1510 | current, &thread_status_size); |
| 1511 | if (!tmp) |
| 1512 | goto end_coredump; |
| 1513 | tmp->next = thread_list; |
| 1514 | thread_list = tmp; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1515 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1516 | segs = vma_count + elf_core_extra_phdrs(); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1517 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1518 | /* for notes section */ |
| 1519 | segs++; |
| 1520 | |
| 1521 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid |
| 1522 | * this, kernel supports extended numbering. Have a look at |
| 1523 | * include/linux/elf.h for further information. */ |
| 1524 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; |
| 1525 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1526 | /* Set up header */ |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1527 | fill_elf_fdpic_header(elf, e_phnum); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1528 | |
| 1529 | has_dumped = 1; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1530 | /* |
| 1531 | * Set up the notes in similar form to SVR4 core dumps made |
| 1532 | * with info from their /proc. |
| 1533 | */ |
| 1534 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1535 | fill_psinfo(psinfo, current->group_leader, current->mm); |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1536 | fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
| 1537 | thread_status_size += notesize(&psinfo_note); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1538 | |
| 1539 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1540 | i = 0; |
| 1541 | do |
| 1542 | i += 2; |
| 1543 | while (auxv[i - 2] != AT_NULL); |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1544 | fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); |
| 1545 | thread_status_size += notesize(&auxv_note); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1546 | |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1547 | offset = sizeof(*elf); /* Elf header */ |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1548 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1549 | |
| 1550 | /* Write notes phdr entry */ |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1551 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
| 1552 | if (!phdr4note) |
| 1553 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1554 | |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1555 | fill_elf_note_phdr(phdr4note, thread_status_size, offset); |
| 1556 | offset += thread_status_size; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1557 | |
| 1558 | /* Page-align dumped data */ |
| 1559 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
| 1560 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1561 | offset += vma_data_size; |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1562 | offset += elf_core_extra_data_size(); |
| 1563 | e_shoff = offset; |
| 1564 | |
| 1565 | if (e_phnum == PN_XNUM) { |
| 1566 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); |
| 1567 | if (!shdr4extnum) |
| 1568 | goto end_coredump; |
| 1569 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); |
| 1570 | } |
| 1571 | |
| 1572 | offset = dataoff; |
| 1573 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1574 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1575 | goto end_coredump; |
| 1576 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1577 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1578 | goto end_coredump; |
| 1579 | |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1580 | /* write program headers for segments dump */ |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1581 | for (i = 0; i < vma_count; i++) { |
| 1582 | struct core_vma_metadata *meta = vma_meta + i; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1583 | struct elf_phdr phdr; |
| 1584 | size_t sz; |
| 1585 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1586 | sz = meta->end - meta->start; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1587 | |
| 1588 | phdr.p_type = PT_LOAD; |
| 1589 | phdr.p_offset = offset; |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1590 | phdr.p_vaddr = meta->start; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1591 | phdr.p_paddr = 0; |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1592 | phdr.p_filesz = meta->dump_size; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1593 | phdr.p_memsz = sz; |
| 1594 | offset += phdr.p_filesz; |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1595 | phdr.p_flags = 0; |
| 1596 | if (meta->flags & VM_READ) |
| 1597 | phdr.p_flags |= PF_R; |
| 1598 | if (meta->flags & VM_WRITE) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1599 | phdr.p_flags |= PF_W; |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1600 | if (meta->flags & VM_EXEC) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1601 | phdr.p_flags |= PF_X; |
| 1602 | phdr.p_align = ELF_EXEC_PAGESIZE; |
| 1603 | |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1604 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
Daisuke HATAYAMA | 088e7af | 2010-03-05 13:44:06 -0800 | [diff] [blame] | 1605 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1606 | } |
| 1607 | |
Al Viro | 506f21c | 2013-10-05 17:22:57 -0400 | [diff] [blame] | 1608 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
Daisuke HATAYAMA | 1fcccba | 2010-03-05 13:44:07 -0800 | [diff] [blame] | 1609 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1610 | |
| 1611 | /* write out the notes section */ |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1612 | if (!writenote(thread_list->notes, cprm)) |
| 1613 | goto end_coredump; |
| 1614 | if (!writenote(&psinfo_note, cprm)) |
| 1615 | goto end_coredump; |
| 1616 | if (!writenote(&auxv_note, cprm)) |
| 1617 | goto end_coredump; |
| 1618 | for (i = 1; i < thread_list->num_notes; i++) |
| 1619 | if (!writenote(thread_list->notes + i, cprm)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1620 | goto end_coredump; |
| 1621 | |
| 1622 | /* write out the thread status notes section */ |
Al Viro | d2f5816 | 2020-06-15 11:03:28 -0400 | [diff] [blame] | 1623 | for (tmp = thread_list->next; tmp; tmp = tmp->next) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1624 | for (i = 0; i < tmp->num_notes; i++) |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1625 | if (!writenote(&tmp->notes[i], cprm)) |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1626 | goto end_coredump; |
| 1627 | } |
| 1628 | |
Al Viro | d0f1088 | 2020-03-08 09:16:37 -0400 | [diff] [blame] | 1629 | dump_skip_to(cprm, dataoff); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1630 | |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1631 | if (!elf_fdpic_dump_segments(cprm, vma_meta, vma_count)) |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1632 | goto end_coredump; |
| 1633 | |
Al Viro | aa3e7ea | 2013-10-05 17:50:15 -0400 | [diff] [blame] | 1634 | if (!elf_core_write_extra_data(cprm)) |
Daisuke HATAYAMA | 1fcccba | 2010-03-05 13:44:07 -0800 | [diff] [blame] | 1635 | goto end_coredump; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1636 | |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1637 | if (e_phnum == PN_XNUM) { |
Al Viro | e6c1baa | 2013-10-05 18:58:47 -0400 | [diff] [blame] | 1638 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
Daisuke HATAYAMA | 8d9032b | 2010-03-05 13:44:10 -0800 | [diff] [blame] | 1639 | goto end_coredump; |
| 1640 | } |
| 1641 | |
Daisuke HATAYAMA | 2f48912 | 2010-01-04 15:42:14 +0900 | [diff] [blame] | 1642 | if (cprm->file->f_pos != offset) { |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1643 | /* Sanity check */ |
| 1644 | printk(KERN_WARNING |
| 1645 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
Daisuke HATAYAMA | 2f48912 | 2010-01-04 15:42:14 +0900 | [diff] [blame] | 1646 | cprm->file->f_pos, offset); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1647 | } |
| 1648 | |
| 1649 | end_coredump: |
Al Viro | 5074c7f | 2020-06-15 10:19:31 -0400 | [diff] [blame] | 1650 | while (thread_list) { |
| 1651 | tmp = thread_list; |
| 1652 | thread_list = thread_list->next; |
| 1653 | kfree(tmp); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1654 | } |
Jann Horn | a07279c | 2020-10-15 20:12:54 -0700 | [diff] [blame] | 1655 | kvfree(vma_meta); |
Daisuke HATAYAMA | 93eb211 | 2010-03-05 13:44:09 -0800 | [diff] [blame] | 1656 | kfree(phdr4note); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1657 | kfree(elf); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1658 | kfree(psinfo); |
Davidlohr Bueso | bcb65a7 | 2011-07-06 12:26:05 +0100 | [diff] [blame] | 1659 | kfree(shdr4extnum); |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1660 | return has_dumped; |
David Howells | 6d8c4e3 | 2006-07-10 04:44:55 -0700 | [diff] [blame] | 1661 | } |
| 1662 | |
Christoph Hellwig | 698ba7b | 2009-12-15 16:47:37 -0800 | [diff] [blame] | 1663 | #endif /* CONFIG_ELF_CORE */ |