Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /****************************************************************************/ |
| 2 | /* |
| 3 | * linux/fs/binfmt_flat.c |
| 4 | * |
| 5 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> |
| 6 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> |
| 7 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> |
| 8 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> |
| 9 | * based heavily on: |
| 10 | * |
| 11 | * linux/fs/binfmt_aout.c: |
| 12 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds |
| 13 | * linux/fs/binfmt_flat.c for 2.0 kernel |
| 14 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
| 15 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) |
| 16 | */ |
| 17 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/kernel.h> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/mman.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/errno.h> |
| 25 | #include <linux/signal.h> |
| 26 | #include <linux/string.h> |
| 27 | #include <linux/fs.h> |
| 28 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/ptrace.h> |
| 30 | #include <linux/user.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/binfmts.h> |
| 33 | #include <linux/personality.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/flat.h> |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 36 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <asm/byteorder.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <asm/unaligned.h> |
| 40 | #include <asm/cacheflush.h> |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 41 | #include <asm/page.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | /****************************************************************************/ |
| 44 | |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 45 | /* |
Mike Frysinger | 2e94de8 | 2010-06-04 14:14:53 -0700 | [diff] [blame] | 46 | * User data (data section and bss) needs to be aligned. |
| 47 | * We pick 0x20 here because it is the max value elf2flt has always |
| 48 | * used in producing FLAT files, and because it seems to be large |
| 49 | * enough to make all the gcc alignment related tests happy. |
| 50 | */ |
| 51 | #define FLAT_DATA_ALIGN (0x20) |
| 52 | |
| 53 | /* |
| 54 | * User data (stack) also needs to be aligned. |
| 55 | * Here we can be a bit looser than the data sections since this |
| 56 | * needs to only meet arch ABI requirements. |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 57 | */ |
Mike Frysinger | 2952095 | 2010-06-29 15:05:21 -0700 | [diff] [blame] | 58 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
| 61 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
| 62 | |
| 63 | struct lib_info { |
| 64 | struct { |
| 65 | unsigned long start_code; /* Start of text segment */ |
| 66 | unsigned long start_data; /* Start of data segment */ |
| 67 | unsigned long start_brk; /* End of data segment */ |
| 68 | unsigned long text_len; /* Length of text segment */ |
| 69 | unsigned long entry; /* Start address for this module */ |
| 70 | unsigned long build_date; /* When this one was compiled */ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 71 | bool loaded; /* Has this library been loaded? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } lib_list[MAX_SHARED_LIBS]; |
| 73 | }; |
| 74 | |
| 75 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 76 | static int load_flat_shared_library(int id, struct lib_info *p); |
| 77 | #endif |
| 78 | |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 79 | static int load_flat_binary(struct linux_binprm *); |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 80 | static int flat_core_dump(struct coredump_params *cprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | static struct linux_binfmt flat_format = { |
| 83 | .module = THIS_MODULE, |
| 84 | .load_binary = load_flat_binary, |
| 85 | .core_dump = flat_core_dump, |
| 86 | .min_coredump = PAGE_SIZE |
| 87 | }; |
| 88 | |
| 89 | /****************************************************************************/ |
| 90 | /* |
| 91 | * Routine writes a core dump image in the current directory. |
| 92 | * Currently only a stub-function. |
| 93 | */ |
| 94 | |
Masami Hiramatsu | f6151df | 2009-12-17 15:27:16 -0800 | [diff] [blame] | 95 | static int flat_core_dump(struct coredump_params *cprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 97 | pr_warn("Process %s:%d received signr %d and should have core dumped\n", |
| 98 | current->comm, current->pid, cprm->siginfo->si_signo); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 99 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | /****************************************************************************/ |
| 103 | /* |
| 104 | * create_flat_tables() parses the env- and arg-strings in new user |
| 105 | * memory and creates the pointer tables from them, and puts their |
| 106 | * addresses on the "stack", returning the new stack pointer value. |
| 107 | */ |
| 108 | |
| 109 | static unsigned long create_flat_tables( |
| 110 | unsigned long pp, |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 111 | struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 113 | unsigned long *argv, *envp; |
| 114 | unsigned long *sp; |
| 115 | char *p = (char *)pp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | int argc = bprm->argc; |
| 117 | int envc = bprm->envc; |
Andrew Morton | 0e647c0 | 2007-10-16 23:27:26 -0700 | [diff] [blame] | 118 | char uninitialized_var(dummy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 120 | sp = (unsigned long *)p; |
| 121 | sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
Mike Frysinger | 2e94de8 | 2010-06-04 14:14:53 -0700 | [diff] [blame] | 122 | sp = (unsigned long *) ((unsigned long)sp & -FLAT_STACK_ALIGN); |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 123 | argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
| 124 | envp = argv + (argc + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | if (flat_argvp_envp_on_stack()) { |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 127 | put_user((unsigned long) envp, sp + 2); |
| 128 | put_user((unsigned long) argv, sp + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 131 | put_user(argc, sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | current->mm->arg_start = (unsigned long) p; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 133 | while (argc-- > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | put_user((unsigned long) p, argv++); |
| 135 | do { |
| 136 | get_user(dummy, p); p++; |
| 137 | } while (dummy); |
| 138 | } |
| 139 | put_user((unsigned long) NULL, argv); |
| 140 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 141 | while (envc-- > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | put_user((unsigned long)p, envp); envp++; |
| 143 | do { |
| 144 | get_user(dummy, p); p++; |
| 145 | } while (dummy); |
| 146 | } |
| 147 | put_user((unsigned long) NULL, envp); |
| 148 | current->mm->env_end = (unsigned long) p; |
| 149 | return (unsigned long)sp; |
| 150 | } |
| 151 | |
| 152 | /****************************************************************************/ |
| 153 | |
| 154 | #ifdef CONFIG_BINFMT_ZFLAT |
| 155 | |
| 156 | #include <linux/zlib.h> |
| 157 | |
| 158 | #define LBUFSIZE 4000 |
| 159 | |
| 160 | /* gzip flag byte */ |
| 161 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ |
| 162 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ |
| 163 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ |
| 164 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ |
| 165 | #define COMMENT 0x10 /* bit 4 set: file comment present */ |
| 166 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ |
| 167 | #define RESERVED 0xC0 /* bit 6,7: reserved */ |
| 168 | |
| 169 | static int decompress_exec( |
| 170 | struct linux_binprm *bprm, |
| 171 | unsigned long offset, |
| 172 | char *dst, |
| 173 | long len, |
| 174 | int fd) |
| 175 | { |
| 176 | unsigned char *buf; |
| 177 | z_stream strm; |
| 178 | loff_t fpos; |
| 179 | int ret, retval; |
| 180 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 181 | pr_debug("decompress_exec(offset=%lx,buf=%p,len=%lx)\n", offset, dst, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | memset(&strm, 0, sizeof(strm)); |
| 184 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
| 185 | if (strm.workspace == NULL) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 186 | pr_debug("no memory for decompress workspace\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | return -ENOMEM; |
| 188 | } |
| 189 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
| 190 | if (buf == NULL) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 191 | pr_debug("no memory for read buffer\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | retval = -ENOMEM; |
| 193 | goto out_free; |
| 194 | } |
| 195 | |
| 196 | /* Read in first chunk of data and parse gzip header. */ |
| 197 | fpos = offset; |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 198 | ret = kernel_read(bprm->file, offset, buf, LBUFSIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | strm.next_in = buf; |
| 201 | strm.avail_in = ret; |
| 202 | strm.total_in = 0; |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 203 | fpos += ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | retval = -ENOEXEC; |
| 206 | |
| 207 | /* Check minimum size -- gzip header */ |
| 208 | if (ret < 10) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 209 | pr_debug("file too small?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | goto out_free_buf; |
| 211 | } |
| 212 | |
| 213 | /* Check gzip magic number */ |
| 214 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 215 | pr_debug("unknown compression magic?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | goto out_free_buf; |
| 217 | } |
| 218 | |
| 219 | /* Check gzip method */ |
| 220 | if (buf[2] != 8) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 221 | pr_debug("unknown compression method?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | goto out_free_buf; |
| 223 | } |
| 224 | /* Check gzip flags */ |
| 225 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
| 226 | (buf[3] & RESERVED)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 227 | pr_debug("unknown flags?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | goto out_free_buf; |
| 229 | } |
| 230 | |
| 231 | ret = 10; |
| 232 | if (buf[3] & EXTRA_FIELD) { |
| 233 | ret += 2 + buf[10] + (buf[11] << 8); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 234 | if (unlikely(ret >= LBUFSIZE)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 235 | pr_debug("buffer overflow (EXTRA)?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | goto out_free_buf; |
| 237 | } |
| 238 | } |
| 239 | if (buf[3] & ORIG_NAME) { |
Volodymyr G. Lukiianyk | f4cfb18 | 2008-10-15 22:01:15 -0700 | [diff] [blame] | 240 | while (ret < LBUFSIZE && buf[ret++] != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | ; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 242 | if (unlikely(ret == LBUFSIZE)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 243 | pr_debug("buffer overflow (ORIG_NAME)?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | goto out_free_buf; |
| 245 | } |
| 246 | } |
| 247 | if (buf[3] & COMMENT) { |
Volodymyr G. Lukiianyk | f4cfb18 | 2008-10-15 22:01:15 -0700 | [diff] [blame] | 248 | while (ret < LBUFSIZE && buf[ret++] != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | ; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 250 | if (unlikely(ret == LBUFSIZE)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 251 | pr_debug("buffer overflow (COMMENT)?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | goto out_free_buf; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | strm.next_in += ret; |
| 257 | strm.avail_in -= ret; |
| 258 | |
| 259 | strm.next_out = dst; |
| 260 | strm.avail_out = len; |
| 261 | strm.total_out = 0; |
| 262 | |
| 263 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 264 | pr_debug("zlib init failed?\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | goto out_free_buf; |
| 266 | } |
| 267 | |
| 268 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 269 | ret = kernel_read(bprm->file, fpos, buf, LBUFSIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | if (ret <= 0) |
| 271 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | len -= ret; |
| 273 | |
| 274 | strm.next_in = buf; |
| 275 | strm.avail_in = ret; |
| 276 | strm.total_in = 0; |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 277 | fpos += ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } |
| 279 | |
| 280 | if (ret < 0) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 281 | pr_debug("decompression failed (%d), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | ret, strm.msg); |
| 283 | goto out_zlib; |
| 284 | } |
| 285 | |
| 286 | retval = 0; |
| 287 | out_zlib: |
| 288 | zlib_inflateEnd(&strm); |
| 289 | out_free_buf: |
| 290 | kfree(buf); |
| 291 | out_free: |
| 292 | kfree(strm.workspace); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | return retval; |
| 294 | } |
| 295 | |
| 296 | #endif /* CONFIG_BINFMT_ZFLAT */ |
| 297 | |
| 298 | /****************************************************************************/ |
| 299 | |
| 300 | static unsigned long |
| 301 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) |
| 302 | { |
| 303 | unsigned long addr; |
| 304 | int id; |
| 305 | unsigned long start_brk; |
| 306 | unsigned long start_data; |
| 307 | unsigned long text_len; |
| 308 | unsigned long start_code; |
| 309 | |
| 310 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 311 | if (r == 0) |
| 312 | id = curid; /* Relocs of 0 are always self referring */ |
| 313 | else { |
| 314 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ |
| 315 | r &= 0x00ffffff; /* Trim ID off here */ |
| 316 | } |
| 317 | if (id >= MAX_SHARED_LIBS) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 318 | pr_err("reference 0x%lx to shared library %d", r, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | goto failed; |
| 320 | } |
| 321 | if (curid != id) { |
| 322 | if (internalp) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 323 | pr_err("reloc address 0x%lx not in same module " |
| 324 | "(%d != %d)", r, curid, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | goto failed; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 326 | } else if (!p->lib_list[id].loaded && |
| 327 | load_flat_shared_library(id, p) < 0) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 328 | pr_err("failed to load library %d", id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | goto failed; |
| 330 | } |
| 331 | /* Check versioning information (i.e. time stamps) */ |
| 332 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && |
| 333 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 334 | pr_err("library %d is younger than %d", id, curid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | goto failed; |
| 336 | } |
| 337 | } |
| 338 | #else |
| 339 | id = 0; |
| 340 | #endif |
| 341 | |
| 342 | start_brk = p->lib_list[id].start_brk; |
| 343 | start_data = p->lib_list[id].start_data; |
| 344 | start_code = p->lib_list[id].start_code; |
| 345 | text_len = p->lib_list[id].text_len; |
| 346 | |
| 347 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 348 | pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 349 | r, start_brk-start_data+text_len, text_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | goto failed; |
| 351 | } |
| 352 | |
| 353 | if (r < text_len) /* In text segment */ |
| 354 | addr = r + start_code; |
| 355 | else /* In data segment */ |
| 356 | addr = r - text_len + start_data; |
| 357 | |
| 358 | /* Range checked already above so doing the range tests is redundant...*/ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 359 | return addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | failed: |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 362 | pr_cont(", killing %s!\n", current->comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | send_sig(SIGSEGV, current, 0); |
| 364 | |
| 365 | return RELOC_FAILED; |
| 366 | } |
| 367 | |
| 368 | /****************************************************************************/ |
| 369 | |
Axel Lin | 3430343 | 2014-06-04 16:12:15 -0700 | [diff] [blame] | 370 | static void old_reloc(unsigned long rl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 372 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | flat_v2_reloc_t r; |
| 374 | unsigned long *ptr; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | r.value = rl; |
| 377 | #if defined(CONFIG_COLDFIRE) |
| 378 | ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset); |
| 379 | #else |
| 380 | ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset); |
| 381 | #endif |
| 382 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 383 | pr_debug("Relocation of variable at DATASEG+%x " |
| 384 | "(address %p, currently %lx) into segment %s\n", |
| 385 | r.reloc.offset, ptr, *ptr, segment[r.reloc.type]); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | switch (r.reloc.type) { |
| 388 | case OLD_FLAT_RELOC_TYPE_TEXT: |
| 389 | *ptr += current->mm->start_code; |
| 390 | break; |
| 391 | case OLD_FLAT_RELOC_TYPE_DATA: |
| 392 | *ptr += current->mm->start_data; |
| 393 | break; |
| 394 | case OLD_FLAT_RELOC_TYPE_BSS: |
| 395 | *ptr += current->mm->end_data; |
| 396 | break; |
| 397 | default: |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 398 | pr_err("Unknown relocation type=%x\n", r.reloc.type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | break; |
| 400 | } |
| 401 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 402 | pr_debug("Relocation became %lx\n", *ptr); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 403 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | |
| 405 | /****************************************************************************/ |
| 406 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 407 | static int load_flat_file(struct linux_binprm *bprm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
| 409 | { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 410 | struct flat_hdr *hdr; |
| 411 | unsigned long textpos, datapos, realdatastart; |
| 412 | unsigned long text_len, data_len, bss_len, stack_len, full_data, flags; |
| 413 | unsigned long len, memp, memp_size, extra, rlim; |
| 414 | unsigned long *reloc, *rp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | struct inode *inode; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 416 | int i, rev, relocs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | loff_t fpos; |
| 418 | unsigned long start_code, end_code; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 419 | ssize_t result; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 420 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | |
| 422 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 423 | inode = file_inode(bprm->file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
| 425 | text_len = ntohl(hdr->data_start); |
| 426 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
| 427 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
| 428 | stack_len = ntohl(hdr->stack_size); |
| 429 | if (extra_stack) { |
| 430 | stack_len += *extra_stack; |
| 431 | *extra_stack = stack_len; |
| 432 | } |
| 433 | relocs = ntohl(hdr->reloc_count); |
| 434 | flags = ntohl(hdr->flags); |
| 435 | rev = ntohl(hdr->rev); |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 436 | full_data = data_len + relocs * sizeof(unsigned long); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 438 | if (strncmp(hdr->magic, "bFLT", 4)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | /* |
Mike Frysinger | e2a366d | 2008-02-14 19:31:29 -0800 | [diff] [blame] | 440 | * Previously, here was a printk to tell people |
| 441 | * "BINFMT_FLAT: bad header magic". |
| 442 | * But for the kernel which also use ELF FD-PIC format, this |
| 443 | * error message is confusing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | * because a lot of people do not manage to produce good |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | */ |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 446 | ret = -ENOEXEC; |
| 447 | goto err; |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | if (flags & FLAT_FLAG_KTRACE) |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 451 | pr_info("Loading file: %s\n", bprm->filename); |
Greg Ungerer | 845884d | 2006-01-10 16:59:37 +1000 | [diff] [blame] | 452 | |
| 453 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 454 | pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
| 455 | rev, FLAT_VERSION, OLD_FLAT_VERSION); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 456 | ret = -ENOEXEC; |
| 457 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | /* Don't allow old format executables to use shared libraries */ |
| 461 | if (rev == OLD_FLAT_VERSION && id != 0) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 462 | pr_err("shared libraries are not available before rev 0x%lx\n", |
| 463 | FLAT_VERSION); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 464 | ret = -ENOEXEC; |
| 465 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
| 467 | |
| 468 | /* |
| 469 | * fix up the flags for the older format, there were all kinds |
| 470 | * of endian hacks, this only works for the simple cases |
| 471 | */ |
| 472 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) |
| 473 | flags = FLAT_FLAG_RAM; |
| 474 | |
| 475 | #ifndef CONFIG_BINFMT_ZFLAT |
| 476 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 477 | pr_err("Support for ZFLAT executables is not enabled.\n"); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 478 | ret = -ENOEXEC; |
| 479 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | #endif |
| 482 | |
| 483 | /* |
| 484 | * Check initial limits. This avoids letting people circumvent |
| 485 | * size limits imposed on them by creating programs with large |
| 486 | * arrays in the data or bss. |
| 487 | */ |
Jiri Slaby | d554ed89 | 2010-03-05 13:42:42 -0800 | [diff] [blame] | 488 | rlim = rlimit(RLIMIT_DATA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | if (rlim >= RLIM_INFINITY) |
| 490 | rlim = ~0; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 491 | if (data_len + bss_len > rlim) { |
| 492 | ret = -ENOMEM; |
| 493 | goto err; |
| 494 | } |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | /* Flush all traces of the currently running executable */ |
| 497 | if (id == 0) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 498 | ret = flush_old_exec(bprm); |
| 499 | if (ret) |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 500 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | /* OK, This is the point of no return */ |
Malcolm Parsons | fcc18e8 | 2006-06-26 11:49:41 +1000 | [diff] [blame] | 503 | set_personality(PER_LINUX_32BIT); |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 504 | setup_new_exec(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | /* |
| 508 | * calculate the extra space we need to map in |
| 509 | */ |
Andrew Morton | 0e647c0 | 2007-10-16 23:27:26 -0700 | [diff] [blame] | 510 | extra = max_t(unsigned long, bss_len + stack_len, |
| 511 | relocs * sizeof(unsigned long)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | /* |
| 514 | * there are a couple of cases here, the separate code/data |
| 515 | * case, and then the fully copied to RAM case which lumps |
| 516 | * it all together. |
| 517 | */ |
| 518 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { |
| 519 | /* |
| 520 | * this should give us a ROM ptr, but if it doesn't we don't |
| 521 | * really care |
| 522 | */ |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 523 | pr_debug("ROM mapping of file (we hope)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 525 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
Matt Helsley | 925d1c4 | 2008-04-29 01:01:36 -0700 | [diff] [blame] | 526 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 527 | if (!textpos || IS_ERR_VALUE(textpos)) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 528 | ret = textpos; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 529 | if (!textpos) |
| 530 | ret = -ENOMEM; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 531 | pr_err("Unable to mmap process text, errno %d\n", ret); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 532 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | } |
| 534 | |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 535 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 536 | len = PAGE_ALIGN(len); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 537 | realdatastart = vm_mmap(NULL, 0, len, |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 538 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 540 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 541 | ret = realdatastart; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 542 | if (!realdatastart) |
| 543 | ret = -ENOMEM; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 544 | pr_err("Unable to allocate RAM for process data, " |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 545 | "errno %d\n", ret); |
| 546 | vm_munmap(textpos, text_len); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 547 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | } |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 549 | datapos = ALIGN(realdatastart + |
| 550 | MAX_SHARED_LIBS * sizeof(unsigned long), |
| 551 | FLAT_DATA_ALIGN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 553 | pr_debug("Allocated data+bss+stack (%ld bytes): %lx\n", |
| 554 | data_len + bss_len + stack_len, datapos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
| 556 | fpos = ntohl(hdr->data_start); |
| 557 | #ifdef CONFIG_BINFMT_ZFLAT |
| 558 | if (flags & FLAT_FLAG_GZDATA) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 559 | result = decompress_exec(bprm, fpos, (char *)datapos, |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 560 | full_data, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } else |
| 562 | #endif |
| 563 | { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 564 | result = read_code(bprm->file, datapos, fpos, |
| 565 | full_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | } |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 567 | if (IS_ERR_VALUE(result)) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 568 | ret = result; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 569 | pr_err("Unable to read data+bss, errno %d\n", ret); |
Al Viro | 7696e0c | 2012-05-30 01:56:23 -0400 | [diff] [blame] | 570 | vm_munmap(textpos, text_len); |
| 571 | vm_munmap(realdatastart, len); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 572 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 575 | reloc = (unsigned long *) |
| 576 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | memp = realdatastart; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 578 | memp_size = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } else { |
| 580 | |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 581 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 582 | len = PAGE_ALIGN(len); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 583 | textpos = vm_mmap(NULL, 0, len, |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 584 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
Greg Ungerer | 72613e5f | 2007-02-07 12:03:08 +1000 | [diff] [blame] | 585 | |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 586 | if (!textpos || IS_ERR_VALUE(textpos)) { |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 587 | ret = textpos; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 588 | if (!textpos) |
| 589 | ret = -ENOMEM; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 590 | pr_err("Unable to allocate RAM for process text/data, " |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 591 | "errno %d\n", ret); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 592 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
| 595 | realdatastart = textpos + ntohl(hdr->data_start); |
Oskar Schirmer | c3dc5be | 2009-05-28 14:34:31 -0700 | [diff] [blame] | 596 | datapos = ALIGN(realdatastart + |
| 597 | MAX_SHARED_LIBS * sizeof(unsigned long), |
| 598 | FLAT_DATA_ALIGN); |
| 599 | |
| 600 | reloc = (unsigned long *) |
| 601 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | memp = textpos; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 603 | memp_size = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | #ifdef CONFIG_BINFMT_ZFLAT |
| 605 | /* |
| 606 | * load it all in and treat it like a RAM load from now on |
| 607 | */ |
| 608 | if (flags & FLAT_FLAG_GZIP) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 609 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
| 610 | (((char *)textpos) + sizeof(struct flat_hdr)), |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 611 | (text_len + full_data |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 612 | - sizeof(struct flat_hdr)), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | 0); |
| 614 | memmove((void *) datapos, (void *) realdatastart, |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 615 | full_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | } else if (flags & FLAT_FLAG_GZDATA) { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 617 | result = read_code(bprm->file, textpos, 0, text_len); |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 618 | if (!IS_ERR_VALUE(result)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | result = decompress_exec(bprm, text_len, (char *) datapos, |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 620 | full_data, 0); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 621 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | #endif |
| 623 | { |
Al Viro | 3dc20cb | 2013-04-13 20:31:37 -0400 | [diff] [blame] | 624 | result = read_code(bprm->file, textpos, 0, text_len); |
| 625 | if (!IS_ERR_VALUE(result)) |
| 626 | result = read_code(bprm->file, datapos, |
| 627 | ntohl(hdr->data_start), |
| 628 | full_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
Mike Frysinger | 0b8c78f | 2009-09-23 15:57:07 -0700 | [diff] [blame] | 630 | if (IS_ERR_VALUE(result)) { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 631 | ret = result; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 632 | pr_err("Unable to read code+data+bss, errno %d\n", ret); |
Al Viro | 7696e0c | 2012-05-30 01:56:23 -0400 | [diff] [blame] | 633 | vm_munmap(textpos, text_len + data_len + extra + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 635 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | } |
| 637 | } |
| 638 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 639 | start_code = textpos + sizeof(struct flat_hdr); |
| 640 | end_code = textpos + text_len; |
| 641 | text_len -= sizeof(struct flat_hdr); /* the real code len */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | /* The main program needs a little extra setup in the task structure */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | if (id == 0) { |
| 645 | current->mm->start_code = start_code; |
| 646 | current->mm->end_code = end_code; |
| 647 | current->mm->start_data = datapos; |
| 648 | current->mm->end_data = datapos + data_len; |
| 649 | /* |
| 650 | * set up the brk stuff, uses any slack left in data/bss/stack |
| 651 | * allocation. We put the brk after the bss (between the bss |
| 652 | * and stack) like other platforms. |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 653 | * Userspace code relies on the stack pointer starting out at |
| 654 | * an address right at the end of a page. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | */ |
| 656 | current->mm->start_brk = datapos + data_len + bss_len; |
| 657 | current->mm->brk = (current->mm->start_brk + 3) & ~3; |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 658 | current->mm->context.end_brk = memp + memp_size - stack_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 661 | if (flags & FLAT_FLAG_KTRACE) { |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 662 | pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
| 663 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
| 664 | pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", |
| 665 | id ? "Lib" : "Load", bprm->filename, |
| 666 | start_code, end_code, datapos, datapos + data_len, |
| 667 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 668 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
| 670 | /* Store the current module values into the global library structure */ |
| 671 | libinfo->lib_list[id].start_code = start_code; |
| 672 | libinfo->lib_list[id].start_data = datapos; |
| 673 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; |
| 674 | libinfo->lib_list[id].text_len = text_len; |
| 675 | libinfo->lib_list[id].loaded = 1; |
| 676 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
| 677 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | /* |
| 680 | * We just load the allocations into some temporary memory to |
| 681 | * help simplify all this mumbo jumbo |
| 682 | * |
| 683 | * We've got two different sections of relocation entries. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 684 | * The first is the GOT which resides at the beginning of the data segment |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | * and is terminated with a -1. This one can be relocated in place. |
| 686 | * The second is the extra relocation entries tacked after the image's |
| 687 | * data segment. These require a little more processing as the entry is |
| 688 | * really an offset into the image which contains an offset into the |
| 689 | * image. |
| 690 | */ |
| 691 | if (flags & FLAT_FLAG_GOTPIC) { |
| 692 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { |
| 693 | unsigned long addr; |
| 694 | if (*rp) { |
| 695 | addr = calc_reloc(*rp, libinfo, id, 0); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 696 | if (addr == RELOC_FAILED) { |
| 697 | ret = -ENOEXEC; |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 698 | goto err; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 699 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | *rp = addr; |
| 701 | } |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * Now run through the relocation entries. |
| 707 | * We've got to be careful here as C++ produces relocatable zero |
| 708 | * entries in the constructor and destructor tables which are then |
| 709 | * tested for being not zero (which will always occur unless we're |
| 710 | * based from address zero). This causes an endless loop as __start |
| 711 | * is at zero. The solution used is to not relocate zero addresses. |
| 712 | * This has the negative side effect of not allowing a global data |
| 713 | * reference to be statically initialised to _stext (I've moved |
| 714 | * __start to address 4 so that is okay). |
| 715 | */ |
| 716 | if (rev > OLD_FLAT_VERSION) { |
Bernd Schmidt | f972020 | 2007-10-03 23:41:43 +0800 | [diff] [blame] | 717 | unsigned long persistent = 0; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 718 | for (i = 0; i < relocs; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | unsigned long addr, relval; |
| 720 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 721 | /* |
| 722 | * Get the address of the pointer to be |
| 723 | * relocated (of course, the address has to be |
| 724 | * relocated first). |
| 725 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | relval = ntohl(reloc[i]); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 727 | if (flat_set_persistent(relval, &persistent)) |
Bernd Schmidt | f972020 | 2007-10-03 23:41:43 +0800 | [diff] [blame] | 728 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | addr = flat_get_relocate_addr(relval); |
| 730 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 731 | if (rp == (unsigned long *)RELOC_FAILED) { |
| 732 | ret = -ENOEXEC; |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 733 | goto err; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | |
| 736 | /* Get the pointer's value. */ |
Andrew Morton | 576bb9c | 2007-10-03 23:43:57 +0800 | [diff] [blame] | 737 | addr = flat_get_addr_from_rp(rp, relval, flags, |
| 738 | &persistent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | if (addr != 0) { |
| 740 | /* |
| 741 | * Do the relocation. PIC relocs in the data section are |
| 742 | * already in target order |
| 743 | */ |
| 744 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
| 745 | addr = ntohl(addr); |
| 746 | addr = calc_reloc(addr, libinfo, id, 0); |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 747 | if (addr == RELOC_FAILED) { |
| 748 | ret = -ENOEXEC; |
Andrew Morton | df88912 | 2006-05-20 15:00:01 -0700 | [diff] [blame] | 749 | goto err; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | /* Write back the relocated pointer. */ |
| 753 | flat_put_addr_at_rp(rp, addr, relval); |
| 754 | } |
| 755 | } |
| 756 | } else { |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 757 | for (i = 0; i < relocs; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | old_reloc(ntohl(reloc[i])); |
| 759 | } |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 760 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | flush_icache_range(start_code, end_code); |
| 762 | |
| 763 | /* zero the BSS, BRK and stack areas */ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 764 | memset((void *)(datapos + data_len), 0, bss_len + |
David Howells | 0f3e442 | 2009-01-08 12:04:47 +0000 | [diff] [blame] | 765 | (memp + memp_size - stack_len - /* end brk */ |
| 766 | libinfo->lib_list[id].start_brk) + /* start brk */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | stack_len); |
| 768 | |
| 769 | return 0; |
Luke Yang | 1ad3dcc | 2006-03-25 03:08:24 -0800 | [diff] [blame] | 770 | err: |
| 771 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | |
| 775 | /****************************************************************************/ |
| 776 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
| 777 | |
| 778 | /* |
| 779 | * Load a shared library into memory. The library gets its own data |
| 780 | * segment (including bss) but not argv/argc/environ. |
| 781 | */ |
| 782 | |
| 783 | static int load_flat_shared_library(int id, struct lib_info *libs) |
| 784 | { |
| 785 | struct linux_binprm bprm; |
| 786 | int res; |
| 787 | char buf[16]; |
| 788 | |
David Howells | 3a852d3 | 2011-04-28 16:26:38 +0100 | [diff] [blame] | 789 | memset(&bprm, 0, sizeof(bprm)); |
| 790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | /* Create the file name */ |
| 792 | sprintf(buf, "/lib/lib%d.so", id); |
| 793 | |
| 794 | /* Open the file up */ |
| 795 | bprm.filename = buf; |
| 796 | bprm.file = open_exec(bprm.filename); |
| 797 | res = PTR_ERR(bprm.file); |
| 798 | if (IS_ERR(bprm.file)) |
| 799 | return res; |
| 800 | |
Linus Torvalds | 3440625 | 2009-08-06 15:09:34 -0700 | [diff] [blame] | 801 | bprm.cred = prepare_exec_creds(); |
| 802 | res = -ENOMEM; |
| 803 | if (!bprm.cred) |
| 804 | goto out; |
| 805 | |
David Howells | 3a852d3 | 2011-04-28 16:26:38 +0100 | [diff] [blame] | 806 | /* We don't really care about recalculating credentials at this point |
| 807 | * as we're past the point of no return and are dealing with shared |
| 808 | * libraries. |
| 809 | */ |
| 810 | bprm.cred_prepared = 1; |
| 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | res = prepare_binprm(&bprm); |
| 813 | |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 814 | if (!res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | res = load_flat_file(&bprm, libs, id, NULL); |
Linus Torvalds | 3440625 | 2009-08-06 15:09:34 -0700 | [diff] [blame] | 816 | |
| 817 | abort_creds(bprm.cred); |
| 818 | |
| 819 | out: |
| 820 | allow_write_access(bprm.file); |
| 821 | fput(bprm.file); |
| 822 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 823 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
| 827 | /****************************************************************************/ |
| 828 | |
| 829 | /* |
| 830 | * These are the functions used to load flat style executables and shared |
| 831 | * libraries. There is no binary dependent code anywhere else. |
| 832 | */ |
| 833 | |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 834 | static int load_flat_binary(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | { |
| 836 | struct lib_info libinfo; |
Al Viro | 71613c3 | 2012-10-20 22:00:48 -0400 | [diff] [blame] | 837 | struct pt_regs *regs = current_pt_regs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | unsigned long p = bprm->p; |
| 839 | unsigned long stack_len; |
| 840 | unsigned long start_addr; |
| 841 | unsigned long *sp; |
| 842 | int res; |
| 843 | int i, j; |
| 844 | |
| 845 | memset(&libinfo, 0, sizeof(libinfo)); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | /* |
| 848 | * We have to add the size of our arguments to our stack size |
| 849 | * otherwise it's too easy for users to create stack overflows |
| 850 | * by passing in a huge argument list. And yes, we have to be |
| 851 | * pedantic and include space for the argv/envp array as it may have |
| 852 | * a lot of entries. |
| 853 | */ |
| 854 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
| 855 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
| 856 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
| 857 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
Mike Frysinger | 2e94de8 | 2010-06-04 14:14:53 -0700 | [diff] [blame] | 858 | stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 859 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
Arnd Bergmann | 287980e | 2016-05-27 23:23:25 +0200 | [diff] [blame] | 861 | if (res < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | return res; |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | /* Update data segment pointers for all libraries */ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 865 | for (i = 0; i < MAX_SHARED_LIBS; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | if (libinfo.lib_list[i].loaded) |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 867 | for (j = 0; j < MAX_SHARED_LIBS; j++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 869 | (libinfo.lib_list[j].loaded) ? |
| 870 | libinfo.lib_list[j].start_data : UNLOADED_LIB; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 872 | install_exec_creds(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | |
| 874 | set_binfmt(&flat_format); |
| 875 | |
| 876 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 877 | pr_debug("p=%lx\n", p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | |
| 879 | /* copy the arg pages onto the stack, this could be more efficient :-) */ |
| 880 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 881 | *(char *) --p = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; |
| 883 | |
| 884 | sp = (unsigned long *) create_flat_tables(p, bprm); |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | /* Fake some return addresses to ensure the call chain will |
| 887 | * initialise library in order for us. We are required to call |
| 888 | * lib 1 first, then 2, ... and finally the main program (id 0). |
| 889 | */ |
| 890 | start_addr = libinfo.lib_list[0].entry; |
| 891 | |
| 892 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 893 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | if (libinfo.lib_list[i].loaded) { |
| 895 | /* Push previos first to call address */ |
| 896 | --sp; put_user(start_addr, sp); |
| 897 | start_addr = libinfo.lib_list[i].entry; |
| 898 | } |
| 899 | } |
| 900 | #endif |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | /* Stash our initial stack pointer into the mm structure */ |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 903 | current->mm->start_stack = (unsigned long)sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
Takashi YOSHII | 74c27c4 | 2008-08-11 20:10:54 +0900 | [diff] [blame] | 905 | #ifdef FLAT_PLAT_INIT |
| 906 | FLAT_PLAT_INIT(regs); |
| 907 | #endif |
Nicolas Pitre | 13c3f50 | 2016-07-24 11:30:15 -0400 | [diff] [blame] | 908 | |
Nicolas Pitre | 4adbb6a | 2016-07-24 11:30:16 -0400 | [diff] [blame^] | 909 | pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
| 910 | regs, start_addr, current->mm->start_stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | start_thread(regs, start_addr, current->mm->start_stack); |
| 912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | return 0; |
| 914 | } |
| 915 | |
| 916 | /****************************************************************************/ |
| 917 | |
| 918 | static int __init init_flat_binfmt(void) |
| 919 | { |
Al Viro | 8fc3dc5 | 2012-03-17 03:05:16 -0400 | [diff] [blame] | 920 | register_binfmt(&flat_format); |
| 921 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | core_initcall(init_flat_binfmt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | |
| 925 | /****************************************************************************/ |