Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * a.out loader for x86-64 |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds |
| 5 | * Hacked together by Andi Kleen |
| 6 | */ |
| 7 | |
| 8 | #include <linux/module.h> |
| 9 | |
| 10 | #include <linux/time.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/mman.h> |
| 14 | #include <linux/a.out.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/signal.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/file.h> |
| 20 | #include <linux/stat.h> |
| 21 | #include <linux/fcntl.h> |
| 22 | #include <linux/ptrace.h> |
| 23 | #include <linux/user.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/binfmts.h> |
| 25 | #include <linux/personality.h> |
| 26 | #include <linux/init.h> |
Julia Lawall | e5fc316 | 2008-01-30 13:32:17 +0100 | [diff] [blame] | 27 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/uaccess.h> |
| 30 | #include <asm/pgalloc.h> |
| 31 | #include <asm/cacheflush.h> |
| 32 | #include <asm/user32.h> |
| 33 | #include <asm/ia32.h> |
| 34 | |
| 35 | #undef WARN_OLD |
Linus Torvalds | 0eead9ab | 2010-10-14 10:57:40 -0700 | [diff] [blame] | 36 | #undef CORE_DUMP /* definitely broken */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 38 | static int load_aout_binary(struct linux_binprm *, struct pt_regs *regs); |
| 39 | static int load_aout_library(struct file *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 41 | #ifdef CORE_DUMP |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 42 | static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, |
| 43 | unsigned long limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * fill in the user structure for a core dump.. |
| 47 | */ |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 48 | static void dump_thread32(struct pt_regs *regs, struct user32 *dump) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 50 | u32 fs, gs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | /* changed the size calculations - should hopefully work better. lbt */ |
| 53 | dump->magic = CMAGIC; |
| 54 | dump->start_code = 0; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 55 | dump->start_stack = regs->sp & ~(PAGE_SIZE - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 57 | dump->u_dsize = ((unsigned long) |
| 58 | (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | dump->u_dsize -= dump->u_tsize; |
| 60 | dump->u_ssize = 0; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 61 | dump->u_debugreg[0] = current->thread.debugreg0; |
| 62 | dump->u_debugreg[1] = current->thread.debugreg1; |
| 63 | dump->u_debugreg[2] = current->thread.debugreg2; |
| 64 | dump->u_debugreg[3] = current->thread.debugreg3; |
| 65 | dump->u_debugreg[4] = 0; |
| 66 | dump->u_debugreg[5] = 0; |
| 67 | dump->u_debugreg[6] = current->thread.debugreg6; |
| 68 | dump->u_debugreg[7] = current->thread.debugreg7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 70 | if (dump->start_stack < 0xc0000000) { |
| 71 | unsigned long tmp; |
| 72 | |
| 73 | tmp = (unsigned long) (0xc0000000 - dump->start_stack); |
| 74 | dump->u_ssize = tmp >> PAGE_SHIFT; |
| 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 77 | dump->regs.bx = regs->bx; |
| 78 | dump->regs.cx = regs->cx; |
| 79 | dump->regs.dx = regs->dx; |
| 80 | dump->regs.si = regs->si; |
| 81 | dump->regs.di = regs->di; |
| 82 | dump->regs.bp = regs->bp; |
| 83 | dump->regs.ax = regs->ax; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | dump->regs.ds = current->thread.ds; |
| 85 | dump->regs.es = current->thread.es; |
Jeremy Fitzhardinge | b6edbb1 | 2008-08-19 13:04:19 -0700 | [diff] [blame] | 86 | savesegment(fs, fs); |
| 87 | dump->regs.fs = fs; |
| 88 | savesegment(gs, gs); |
| 89 | dump->regs.gs = gs; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 90 | dump->regs.orig_ax = regs->orig_ax; |
| 91 | dump->regs.ip = regs->ip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | dump->regs.cs = regs->cs; |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 93 | dump->regs.flags = regs->flags; |
| 94 | dump->regs.sp = regs->sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | dump->regs.ss = regs->ss; |
| 96 | |
| 97 | #if 1 /* FIXME */ |
| 98 | dump->u_fpvalid = 0; |
| 99 | #else |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 100 | dump->u_fpvalid = dump_fpu(regs, &dump->i387); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #endif |
| 102 | } |
| 103 | |
| 104 | #endif |
| 105 | |
| 106 | static struct linux_binfmt aout_format = { |
| 107 | .module = THIS_MODULE, |
| 108 | .load_binary = load_aout_binary, |
| 109 | .load_shlib = load_aout_library, |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 110 | #ifdef CORE_DUMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | .core_dump = aout_core_dump, |
| 112 | #endif |
| 113 | .min_coredump = PAGE_SIZE |
| 114 | }; |
| 115 | |
| 116 | static void set_brk(unsigned long start, unsigned long end) |
| 117 | { |
| 118 | start = PAGE_ALIGN(start); |
| 119 | end = PAGE_ALIGN(end); |
| 120 | if (end <= start) |
| 121 | return; |
Linus Torvalds | e4eb1ff | 2012-04-20 15:35:40 -0700 | [diff] [blame] | 122 | vm_brk(start, end - start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 125 | #ifdef CORE_DUMP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* |
| 127 | * These are the only things you should do on a core-file: use only these |
| 128 | * macros to write out all the necessary info. |
| 129 | */ |
| 130 | |
Linus Torvalds | 0eead9ab | 2010-10-14 10:57:40 -0700 | [diff] [blame] | 131 | #include <linux/coredump.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 133 | #define DUMP_WRITE(addr, nr) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | if (!dump_write(file, (void *)(addr), (nr))) \ |
| 135 | goto end_coredump; |
| 136 | |
Linus Torvalds | 0eead9ab | 2010-10-14 10:57:40 -0700 | [diff] [blame] | 137 | #define DUMP_SEEK(offset) \ |
| 138 | if (!dump_seek(file, offset)) \ |
| 139 | goto end_coredump; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 140 | |
| 141 | #define START_DATA() (u.u_tsize << PAGE_SHIFT) |
| 142 | #define START_STACK(u) (u.start_stack) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | /* |
| 145 | * Routine writes a core dump image in the current directory. |
| 146 | * Currently only a stub-function. |
| 147 | * |
| 148 | * Note that setuid/setgid files won't make a core-dump if the uid/gid |
| 149 | * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable" |
| 150 | * field, which also makes sure the core-dumps won't be recursive if the |
| 151 | * dumping of the process results in another error.. |
| 152 | */ |
| 153 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 154 | static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file, |
| 155 | unsigned long limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | { |
| 157 | mm_segment_t fs; |
| 158 | int has_dumped = 0; |
| 159 | unsigned long dump_start, dump_size; |
| 160 | struct user32 dump; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | fs = get_fs(); |
| 163 | set_fs(KERNEL_DS); |
| 164 | has_dumped = 1; |
| 165 | current->flags |= PF_DUMPCORE; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 166 | strncpy(dump.u_comm, current->comm, sizeof(current->comm)); |
H. Peter Anvin | 6e16d89 | 2008-02-07 00:15:57 -0800 | [diff] [blame] | 167 | dump.u_ar0 = offsetof(struct user32, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | dump.signal = signr; |
| 169 | dump_thread32(regs, &dump); |
| 170 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 171 | /* |
| 172 | * If the size of the dump file exceeds the rlimit, then see |
| 173 | * what would happen if we wrote the stack, but not the data |
| 174 | * area. |
| 175 | */ |
Neil Horman | 7dc0b22 | 2007-10-16 23:26:34 -0700 | [diff] [blame] | 176 | if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | dump.u_dsize = 0; |
| 178 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 179 | /* Make sure we have enough room to write the stack and data areas. */ |
Neil Horman | 7dc0b22 | 2007-10-16 23:26:34 -0700 | [diff] [blame] | 180 | if ((dump.u_ssize + 1) * PAGE_SIZE > limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | dump.u_ssize = 0; |
| 182 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 183 | /* make sure we actually have a data and stack area to dump */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | set_fs(USER_DS); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 185 | if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump), |
| 186 | dump.u_dsize << PAGE_SHIFT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | dump.u_dsize = 0; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 188 | if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump), |
| 189 | dump.u_ssize << PAGE_SHIFT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | dump.u_ssize = 0; |
| 191 | |
| 192 | set_fs(KERNEL_DS); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 193 | /* struct user */ |
| 194 | DUMP_WRITE(&dump, sizeof(dump)); |
| 195 | /* Now dump all of the user data. Include malloced stuff as well */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | DUMP_SEEK(PAGE_SIZE); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 197 | /* now we start writing out the user space info */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | set_fs(USER_DS); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 199 | /* Dump the data area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | if (dump.u_dsize != 0) { |
| 201 | dump_start = START_DATA(dump); |
| 202 | dump_size = dump.u_dsize << PAGE_SHIFT; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 203 | DUMP_WRITE(dump_start, dump_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 205 | /* Now prepare to dump the stack area */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | if (dump.u_ssize != 0) { |
| 207 | dump_start = START_STACK(dump); |
| 208 | dump_size = dump.u_ssize << PAGE_SHIFT; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 209 | DUMP_WRITE(dump_start, dump_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | end_coredump: |
| 212 | set_fs(fs); |
| 213 | return has_dumped; |
| 214 | } |
| 215 | #endif |
| 216 | |
| 217 | /* |
| 218 | * create_aout_tables() parses the env- and arg-strings in new user |
| 219 | * memory and creates the pointer tables from them, and puts their |
| 220 | * addresses on the "stack", returning the new stack pointer value. |
| 221 | */ |
| 222 | static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm) |
| 223 | { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 224 | u32 __user *argv, *envp, *sp; |
| 225 | int argc = bprm->argc, envc = bprm->envc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | |
| 227 | sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p); |
| 228 | sp -= envc+1; |
| 229 | envp = sp; |
| 230 | sp -= argc+1; |
| 231 | argv = sp; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 232 | put_user((unsigned long) envp, --sp); |
| 233 | put_user((unsigned long) argv, --sp); |
| 234 | put_user(argc, --sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | current->mm->arg_start = (unsigned long) p; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 236 | while (argc-- > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | char c; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 238 | |
| 239 | put_user((u32)(unsigned long)p, argv++); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | do { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 241 | get_user(c, p++); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } while (c); |
| 243 | } |
Andi Kleen | 7401969 | 2007-01-11 01:52:45 +0100 | [diff] [blame] | 244 | put_user(0, argv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 246 | while (envc-- > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | char c; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 248 | |
| 249 | put_user((u32)(unsigned long)p, envp++); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | do { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 251 | get_user(c, p++); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } while (c); |
| 253 | } |
Andi Kleen | 7401969 | 2007-01-11 01:52:45 +0100 | [diff] [blame] | 254 | put_user(0, envp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | current->mm->env_end = (unsigned long) p; |
| 256 | return sp; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * These are the functions used to load a.out style executables and shared |
| 261 | * libraries. There is no binary dependent code anywhere else. |
| 262 | */ |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 263 | static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 265 | unsigned long error, fd_offset, rlim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | struct exec ex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | int retval; |
| 268 | |
| 269 | ex = *((struct exec *) bprm->buf); /* exec-header */ |
| 270 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC && |
| 271 | N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) || |
| 272 | N_TRSIZE(ex) || N_DRSIZE(ex) || |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 273 | i_size_read(bprm->file->f_path.dentry->d_inode) < |
| 274 | ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | return -ENOEXEC; |
| 276 | } |
| 277 | |
| 278 | fd_offset = N_TXTOFF(ex); |
| 279 | |
| 280 | /* Check initial limits. This avoids letting people circumvent |
| 281 | * size limits imposed on them by creating programs with large |
| 282 | * arrays in the data or bss. |
| 283 | */ |
Jiri Slaby | 2854e72 | 2010-01-27 17:32:22 +0100 | [diff] [blame] | 284 | rlim = rlimit(RLIMIT_DATA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | if (rlim >= RLIM_INFINITY) |
| 286 | rlim = ~0; |
| 287 | if (ex.a_data + ex.a_bss > rlim) |
| 288 | return -ENOMEM; |
| 289 | |
| 290 | /* Flush all traces of the currently running executable */ |
| 291 | retval = flush_old_exec(bprm); |
| 292 | if (retval) |
| 293 | return retval; |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | /* OK, This is the point of no return */ |
| 296 | set_personality(PER_LINUX); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 297 | set_thread_flag(TIF_IA32); |
Stephen Wilson | 375906f | 2011-03-13 15:49:14 -0400 | [diff] [blame] | 298 | current->mm->context.ia32_compat = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
Linus Torvalds | 221af7f | 2010-01-28 22:14:42 -0800 | [diff] [blame] | 300 | setup_new_exec(bprm); |
| 301 | |
| 302 | regs->cs = __USER32_CS; |
| 303 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 = |
| 304 | regs->r13 = regs->r14 = regs->r15 = 0; |
| 305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | current->mm->end_code = ex.a_text + |
| 307 | (current->mm->start_code = N_TXTADDR(ex)); |
| 308 | current->mm->end_data = ex.a_data + |
| 309 | (current->mm->start_data = N_DATADDR(ex)); |
| 310 | current->mm->brk = ex.a_bss + |
| 311 | (current->mm->start_brk = N_BSSADDR(ex)); |
| 312 | current->mm->free_area_cache = TASK_UNMAPPED_BASE; |
Wolfgang Wander | 1363c3c | 2005-06-21 17:14:49 -0700 | [diff] [blame] | 313 | current->mm->cached_hole_size = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
Al Viro | 6414fa6a | 2012-03-05 06:38:42 +0000 | [diff] [blame] | 315 | retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT); |
| 316 | if (retval < 0) { |
| 317 | /* Someone check-me: is this error path enough? */ |
| 318 | send_sig(SIGKILL, current, 0); |
| 319 | return retval; |
| 320 | } |
| 321 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 322 | install_exec_creds(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | if (N_MAGIC(ex) == OMAGIC) { |
| 325 | unsigned long text_addr, map_size; |
| 326 | loff_t pos; |
| 327 | |
| 328 | text_addr = N_TXTADDR(ex); |
| 329 | |
| 330 | pos = 32; |
| 331 | map_size = ex.a_text+ex.a_data; |
| 332 | |
Linus Torvalds | e4eb1ff | 2012-04-20 15:35:40 -0700 | [diff] [blame] | 333 | error = vm_brk(text_addr & PAGE_MASK, map_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | |
| 335 | if (error != (text_addr & PAGE_MASK)) { |
| 336 | send_sig(SIGKILL, current, 0); |
| 337 | return error; |
| 338 | } |
| 339 | |
Andi Kleen | 52d522f | 2006-09-26 10:52:33 +0200 | [diff] [blame] | 340 | error = bprm->file->f_op->read(bprm->file, |
| 341 | (char __user *)text_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | ex.a_text+ex.a_data, &pos); |
| 343 | if ((signed long)error < 0) { |
| 344 | send_sig(SIGKILL, current, 0); |
| 345 | return error; |
| 346 | } |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data); |
| 349 | } else { |
| 350 | #ifdef WARN_OLD |
| 351 | static unsigned long error_time, error_time2; |
| 352 | if ((ex.a_text & 0xfff || ex.a_data & 0xfff) && |
Julia Lawall | e5fc316 | 2008-01-30 13:32:17 +0100 | [diff] [blame] | 353 | (N_MAGIC(ex) != NMAGIC) && |
| 354 | time_after(jiffies, error_time2 + 5*HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | printk(KERN_NOTICE "executable not page aligned\n"); |
| 356 | error_time2 = jiffies; |
| 357 | } |
| 358 | |
| 359 | if ((fd_offset & ~PAGE_MASK) != 0 && |
Julia Lawall | e5fc316 | 2008-01-30 13:32:17 +0100 | [diff] [blame] | 360 | time_after(jiffies, error_time + 5*HZ)) { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 361 | printk(KERN_WARNING |
| 362 | "fd_offset is not page aligned. Please convert " |
| 363 | "program: %s\n", |
Josef "Jeff" Sipek | c941192 | 2006-12-08 02:36:43 -0800 | [diff] [blame] | 364 | bprm->file->f_path.dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | error_time = jiffies; |
| 366 | } |
| 367 | #endif |
| 368 | |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 369 | if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | loff_t pos = fd_offset; |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 371 | |
Linus Torvalds | e4eb1ff | 2012-04-20 15:35:40 -0700 | [diff] [blame] | 372 | vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data); |
Andi Kleen | 52d522f | 2006-09-26 10:52:33 +0200 | [diff] [blame] | 373 | bprm->file->f_op->read(bprm->file, |
| 374 | (char __user *)N_TXTADDR(ex), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | ex.a_text+ex.a_data, &pos); |
| 376 | flush_icache_range((unsigned long) N_TXTADDR(ex), |
| 377 | (unsigned long) N_TXTADDR(ex) + |
| 378 | ex.a_text+ex.a_data); |
| 379 | goto beyond_if; |
| 380 | } |
| 381 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 382 | error = vm_mmap(bprm->file, N_TXTADDR(ex), ex.a_text, |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 383 | PROT_READ | PROT_EXEC, |
| 384 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | |
| 385 | MAP_EXECUTABLE | MAP_32BIT, |
| 386 | fd_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | if (error != N_TXTADDR(ex)) { |
| 389 | send_sig(SIGKILL, current, 0); |
| 390 | return error; |
| 391 | } |
| 392 | |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 393 | error = vm_mmap(bprm->file, N_DATADDR(ex), ex.a_data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | PROT_READ | PROT_WRITE | PROT_EXEC, |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 395 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | |
| 396 | MAP_EXECUTABLE | MAP_32BIT, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | fd_offset + ex.a_text); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (error != N_DATADDR(ex)) { |
| 399 | send_sig(SIGKILL, current, 0); |
| 400 | return error; |
| 401 | } |
| 402 | } |
| 403 | beyond_if: |
| 404 | set_binfmt(&aout_format); |
| 405 | |
| 406 | set_brk(current->mm->start_brk, current->mm->brk); |
| 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | current->mm->start_stack = |
| 409 | (unsigned long)create_aout_tables((char __user *)bprm->p, bprm); |
| 410 | /* start thread */ |
Jeremy Fitzhardinge | b6edbb1 | 2008-08-19 13:04:19 -0700 | [diff] [blame] | 411 | loadsegment(fs, 0); |
| 412 | loadsegment(ds, __USER32_DS); |
| 413 | loadsegment(es, __USER32_DS); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 414 | load_gs_index(0); |
H. Peter Anvin | 65ea5b0 | 2008-01-30 13:30:56 +0100 | [diff] [blame] | 415 | (regs)->ip = ex.a_entry; |
| 416 | (regs)->sp = current->mm->start_stack; |
| 417 | (regs)->flags = 0x200; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | (regs)->cs = __USER32_CS; |
| 419 | (regs)->ss = __USER32_DS; |
Andi Kleen | f891dd1 | 2007-10-17 18:04:33 +0200 | [diff] [blame] | 420 | regs->r8 = regs->r9 = regs->r10 = regs->r11 = |
| 421 | regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | set_fs(USER_DS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | static int load_aout_library(struct file *file) |
| 427 | { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 428 | struct inode *inode; |
| 429 | unsigned long bss, start_addr, len, error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | int retval; |
| 431 | struct exec ex; |
| 432 | |
Josef "Jeff" Sipek | c941192 | 2006-12-08 02:36:43 -0800 | [diff] [blame] | 433 | inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
| 435 | retval = -ENOEXEC; |
| 436 | error = kernel_read(file, 0, (char *) &ex, sizeof(ex)); |
| 437 | if (error != sizeof(ex)) |
| 438 | goto out; |
| 439 | |
| 440 | /* We come in here for the regular a.out style of shared libraries */ |
| 441 | if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) || |
| 442 | N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) || |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 443 | i_size_read(inode) < |
| 444 | ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | goto out; |
| 446 | } |
| 447 | |
| 448 | if (N_FLAGS(ex)) |
| 449 | goto out; |
| 450 | |
| 451 | /* For QMAGIC, the starting address is 0x20 into the page. We mask |
| 452 | this off to get the starting address for the page */ |
| 453 | |
| 454 | start_addr = ex.a_entry & 0xfffff000; |
| 455 | |
| 456 | if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) { |
| 457 | loff_t pos = N_TXTOFF(ex); |
| 458 | |
| 459 | #ifdef WARN_OLD |
| 460 | static unsigned long error_time; |
Julia Lawall | e5fc316 | 2008-01-30 13:32:17 +0100 | [diff] [blame] | 461 | if (time_after(jiffies, error_time + 5*HZ)) { |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 462 | printk(KERN_WARNING |
| 463 | "N_TXTOFF is not page aligned. Please convert " |
| 464 | "library: %s\n", |
Josef "Jeff" Sipek | c941192 | 2006-12-08 02:36:43 -0800 | [diff] [blame] | 465 | file->f_path.dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | error_time = jiffies; |
| 467 | } |
| 468 | #endif |
Linus Torvalds | e4eb1ff | 2012-04-20 15:35:40 -0700 | [diff] [blame] | 469 | vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss); |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 470 | |
Andi Kleen | 52d522f | 2006-09-26 10:52:33 +0200 | [diff] [blame] | 471 | file->f_op->read(file, (char __user *)start_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | ex.a_text + ex.a_data, &pos); |
| 473 | flush_icache_range((unsigned long) start_addr, |
Thomas Gleixner | 8edf8be | 2008-01-30 13:30:07 +0100 | [diff] [blame] | 474 | (unsigned long) start_addr + ex.a_text + |
| 475 | ex.a_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
| 477 | retval = 0; |
| 478 | goto out; |
| 479 | } |
| 480 | /* Now use mmap to map the library into memory. */ |
Linus Torvalds | 6be5ceb | 2012-04-20 17:13:58 -0700 | [diff] [blame] | 481 | error = vm_mmap(file, start_addr, ex.a_text + ex.a_data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | PROT_READ | PROT_WRITE | PROT_EXEC, |
| 483 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT, |
| 484 | N_TXTOFF(ex)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | retval = error; |
| 486 | if (error != start_addr) |
| 487 | goto out; |
| 488 | |
| 489 | len = PAGE_ALIGN(ex.a_text + ex.a_data); |
| 490 | bss = ex.a_text + ex.a_data + ex.a_bss; |
| 491 | if (bss > len) { |
Linus Torvalds | e4eb1ff | 2012-04-20 15:35:40 -0700 | [diff] [blame] | 492 | error = vm_brk(start_addr + len, bss - len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | retval = error; |
| 494 | if (error != start_addr + len) |
| 495 | goto out; |
| 496 | } |
| 497 | retval = 0; |
| 498 | out: |
| 499 | return retval; |
| 500 | } |
| 501 | |
| 502 | static int __init init_aout_binfmt(void) |
| 503 | { |
Al Viro | 8fc3dc5 | 2012-03-17 03:05:16 -0400 | [diff] [blame] | 504 | register_binfmt(&aout_format); |
| 505 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
| 508 | static void __exit exit_aout_binfmt(void) |
| 509 | { |
| 510 | unregister_binfmt(&aout_format); |
| 511 | } |
| 512 | |
| 513 | module_init(init_aout_binfmt); |
| 514 | module_exit(exit_aout_binfmt); |
| 515 | MODULE_LICENSE("GPL"); |