blob: 58cccb6483b0580d28d935b4692f62b2675f7d02 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
24#include <linux/slab.h>
25#include <linux/binfmts.h>
26#include <linux/personality.h>
27#include <linux/init.h>
Julia Lawalle5fc3162008-01-30 13:32:17 +010028#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30#include <asm/system.h>
31#include <asm/uaccess.h>
32#include <asm/pgalloc.h>
33#include <asm/cacheflush.h>
34#include <asm/user32.h>
35#include <asm/ia32.h>
36
37#undef WARN_OLD
38#undef CORE_DUMP /* probably broken */
39
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010040static int load_aout_binary(struct linux_binprm *, struct pt_regs *regs);
41static int load_aout_library(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Olaf Hering44456d32005-07-27 11:45:17 -070043#ifdef CORE_DUMP
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010044static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
45 unsigned long limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47/*
48 * fill in the user structure for a core dump..
49 */
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010050static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010052 u32 fs, gs;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/* changed the size calculations - should hopefully work better. lbt */
55 dump->magic = CMAGIC;
56 dump->start_code = 0;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010057 dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010059 dump->u_dsize = ((unsigned long)
60 (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 dump->u_dsize -= dump->u_tsize;
62 dump->u_ssize = 0;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010063 dump->u_debugreg[0] = current->thread.debugreg0;
64 dump->u_debugreg[1] = current->thread.debugreg1;
65 dump->u_debugreg[2] = current->thread.debugreg2;
66 dump->u_debugreg[3] = current->thread.debugreg3;
67 dump->u_debugreg[4] = 0;
68 dump->u_debugreg[5] = 0;
69 dump->u_debugreg[6] = current->thread.debugreg6;
70 dump->u_debugreg[7] = current->thread.debugreg7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010072 if (dump->start_stack < 0xc0000000) {
73 unsigned long tmp;
74
75 tmp = (unsigned long) (0xc0000000 - dump->start_stack);
76 dump->u_ssize = tmp >> PAGE_SHIFT;
77 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010079 dump->regs.bx = regs->bx;
80 dump->regs.cx = regs->cx;
81 dump->regs.dx = regs->dx;
82 dump->regs.si = regs->si;
83 dump->regs.di = regs->di;
84 dump->regs.bp = regs->bp;
85 dump->regs.ax = regs->ax;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 dump->regs.ds = current->thread.ds;
87 dump->regs.es = current->thread.es;
88 asm("movl %%fs,%0" : "=r" (fs)); dump->regs.fs = fs;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010089 asm("movl %%gs,%0" : "=r" (gs)); dump->regs.gs = gs;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010090 dump->regs.orig_ax = regs->orig_ax;
91 dump->regs.ip = regs->ip;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 dump->regs.cs = regs->cs;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010093 dump->regs.flags = regs->flags;
94 dump->regs.sp = regs->sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 dump->regs.ss = regs->ss;
96
97#if 1 /* FIXME */
98 dump->u_fpvalid = 0;
99#else
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100100 dump->u_fpvalid = dump_fpu(regs, &dump->i387);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#endif
102}
103
104#endif
105
106static struct linux_binfmt aout_format = {
107 .module = THIS_MODULE,
108 .load_binary = load_aout_binary,
109 .load_shlib = load_aout_library,
Olaf Hering44456d32005-07-27 11:45:17 -0700110#ifdef CORE_DUMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 .core_dump = aout_core_dump,
112#endif
113 .min_coredump = PAGE_SIZE
114};
115
116static 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;
122 down_write(&current->mm->mmap_sem);
123 do_brk(start, end - start);
124 up_write(&current->mm->mmap_sem);
125}
126
Olaf Hering44456d32005-07-27 11:45:17 -0700127#ifdef CORE_DUMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128/*
129 * These are the only things you should do on a core-file: use only these
130 * macros to write out all the necessary info.
131 */
132
133static int dump_write(struct file *file, const void *addr, int nr)
134{
135 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
136}
137
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100138#define DUMP_WRITE(addr, nr) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 if (!dump_write(file, (void *)(addr), (nr))) \
140 goto end_coredump;
141
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100142#define DUMP_SEEK(offset) \
143 if (file->f_op->llseek) { \
144 if (file->f_op->llseek(file, (offset), 0) != (offset)) \
145 goto end_coredump; \
146 } else \
147 file->f_pos = (offset)
148
149#define START_DATA() (u.u_tsize << PAGE_SHIFT)
150#define START_STACK(u) (u.start_stack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152/*
153 * Routine writes a core dump image in the current directory.
154 * Currently only a stub-function.
155 *
156 * Note that setuid/setgid files won't make a core-dump if the uid/gid
157 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
158 * field, which also makes sure the core-dumps won't be recursive if the
159 * dumping of the process results in another error..
160 */
161
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100162static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
163 unsigned long limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 mm_segment_t fs;
166 int has_dumped = 0;
167 unsigned long dump_start, dump_size;
168 struct user32 dump;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 fs = get_fs();
171 set_fs(KERNEL_DS);
172 has_dumped = 1;
173 current->flags |= PF_DUMPCORE;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100174 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
H. Peter Anvin6e16d892008-02-07 00:15:57 -0800175 dump.u_ar0 = offsetof(struct user32, regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 dump.signal = signr;
177 dump_thread32(regs, &dump);
178
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100179 /*
180 * If the size of the dump file exceeds the rlimit, then see
181 * what would happen if we wrote the stack, but not the data
182 * area.
183 */
Neil Horman7dc0b222007-10-16 23:26:34 -0700184 if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 dump.u_dsize = 0;
186
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100187 /* Make sure we have enough room to write the stack and data areas. */
Neil Horman7dc0b222007-10-16 23:26:34 -0700188 if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 dump.u_ssize = 0;
190
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100191 /* make sure we actually have a data and stack area to dump */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 set_fs(USER_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100193 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
194 dump.u_dsize << PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 dump.u_dsize = 0;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100196 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
197 dump.u_ssize << PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 dump.u_ssize = 0;
199
200 set_fs(KERNEL_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100201 /* struct user */
202 DUMP_WRITE(&dump, sizeof(dump));
203 /* Now dump all of the user data. Include malloced stuff as well */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 DUMP_SEEK(PAGE_SIZE);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100205 /* now we start writing out the user space info */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 set_fs(USER_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100207 /* Dump the data area */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 if (dump.u_dsize != 0) {
209 dump_start = START_DATA(dump);
210 dump_size = dump.u_dsize << PAGE_SHIFT;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100211 DUMP_WRITE(dump_start, dump_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100213 /* Now prepare to dump the stack area */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (dump.u_ssize != 0) {
215 dump_start = START_STACK(dump);
216 dump_size = dump.u_ssize << PAGE_SHIFT;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100217 DUMP_WRITE(dump_start, dump_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100219 /*
220 * Finally dump the task struct. Not be used by gdb, but
221 * could be useful
222 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 set_fs(KERNEL_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100224 DUMP_WRITE(current, sizeof(*current));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225end_coredump:
226 set_fs(fs);
227 return has_dumped;
228}
229#endif
230
231/*
232 * create_aout_tables() parses the env- and arg-strings in new user
233 * memory and creates the pointer tables from them, and puts their
234 * addresses on the "stack", returning the new stack pointer value.
235 */
236static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
237{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100238 u32 __user *argv, *envp, *sp;
239 int argc = bprm->argc, envc = bprm->envc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
242 sp -= envc+1;
243 envp = sp;
244 sp -= argc+1;
245 argv = sp;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100246 put_user((unsigned long) envp, --sp);
247 put_user((unsigned long) argv, --sp);
248 put_user(argc, --sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 current->mm->arg_start = (unsigned long) p;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100250 while (argc-- > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 char c;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100252
253 put_user((u32)(unsigned long)p, argv++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 do {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100255 get_user(c, p++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 } while (c);
257 }
Andi Kleen74019692007-01-11 01:52:45 +0100258 put_user(0, argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100260 while (envc-- > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 char c;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100262
263 put_user((u32)(unsigned long)p, envp++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 do {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100265 get_user(c, p++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 } while (c);
267 }
Andi Kleen74019692007-01-11 01:52:45 +0100268 put_user(0, envp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 current->mm->env_end = (unsigned long) p;
270 return sp;
271}
272
273/*
274 * These are the functions used to load a.out style executables and shared
275 * libraries. There is no binary dependent code anywhere else.
276 */
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100277static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100279 unsigned long error, fd_offset, rlim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 struct exec ex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 int retval;
282
283 ex = *((struct exec *) bprm->buf); /* exec-header */
284 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
285 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
286 N_TRSIZE(ex) || N_DRSIZE(ex) ||
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100287 i_size_read(bprm->file->f_path.dentry->d_inode) <
288 ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return -ENOEXEC;
290 }
291
292 fd_offset = N_TXTOFF(ex);
293
294 /* Check initial limits. This avoids letting people circumvent
295 * size limits imposed on them by creating programs with large
296 * arrays in the data or bss.
297 */
298 rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
299 if (rlim >= RLIM_INFINITY)
300 rlim = ~0;
301 if (ex.a_data + ex.a_bss > rlim)
302 return -ENOMEM;
303
304 /* Flush all traces of the currently running executable */
305 retval = flush_old_exec(bprm);
306 if (retval)
307 return retval;
308
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100309 regs->cs = __USER32_CS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
311 regs->r13 = regs->r14 = regs->r15 = 0;
312
313 /* OK, This is the point of no return */
314 set_personality(PER_LINUX);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100315 set_thread_flag(TIF_IA32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 clear_thread_flag(TIF_ABI_PENDING);
317
318 current->mm->end_code = ex.a_text +
319 (current->mm->start_code = N_TXTADDR(ex));
320 current->mm->end_data = ex.a_data +
321 (current->mm->start_data = N_DATADDR(ex));
322 current->mm->brk = ex.a_bss +
323 (current->mm->start_brk = N_BSSADDR(ex));
324 current->mm->free_area_cache = TASK_UNMAPPED_BASE;
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700325 current->mm->cached_hole_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 current->mm->mmap = NULL;
328 compute_creds(bprm);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100329 current->flags &= ~PF_FORKNOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 if (N_MAGIC(ex) == OMAGIC) {
332 unsigned long text_addr, map_size;
333 loff_t pos;
334
335 text_addr = N_TXTADDR(ex);
336
337 pos = 32;
338 map_size = ex.a_text+ex.a_data;
339
340 down_write(&current->mm->mmap_sem);
341 error = do_brk(text_addr & PAGE_MASK, map_size);
342 up_write(&current->mm->mmap_sem);
343
344 if (error != (text_addr & PAGE_MASK)) {
345 send_sig(SIGKILL, current, 0);
346 return error;
347 }
348
Andi Kleen52d522f2006-09-26 10:52:33 +0200349 error = bprm->file->f_op->read(bprm->file,
350 (char __user *)text_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 ex.a_text+ex.a_data, &pos);
352 if ((signed long)error < 0) {
353 send_sig(SIGKILL, current, 0);
354 return error;
355 }
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
358 } else {
359#ifdef WARN_OLD
360 static unsigned long error_time, error_time2;
361 if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
Julia Lawalle5fc3162008-01-30 13:32:17 +0100362 (N_MAGIC(ex) != NMAGIC) &&
363 time_after(jiffies, error_time2 + 5*HZ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 printk(KERN_NOTICE "executable not page aligned\n");
365 error_time2 = jiffies;
366 }
367
368 if ((fd_offset & ~PAGE_MASK) != 0 &&
Julia Lawalle5fc3162008-01-30 13:32:17 +0100369 time_after(jiffies, error_time + 5*HZ)) {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100370 printk(KERN_WARNING
371 "fd_offset is not page aligned. Please convert "
372 "program: %s\n",
Josef "Jeff" Sipekc9411922006-12-08 02:36:43 -0800373 bprm->file->f_path.dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 error_time = jiffies;
375 }
376#endif
377
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100378 if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 loff_t pos = fd_offset;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 down_write(&current->mm->mmap_sem);
382 do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
383 up_write(&current->mm->mmap_sem);
Andi Kleen52d522f2006-09-26 10:52:33 +0200384 bprm->file->f_op->read(bprm->file,
385 (char __user *)N_TXTADDR(ex),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 ex.a_text+ex.a_data, &pos);
387 flush_icache_range((unsigned long) N_TXTADDR(ex),
388 (unsigned long) N_TXTADDR(ex) +
389 ex.a_text+ex.a_data);
390 goto beyond_if;
391 }
392
393 down_write(&current->mm->mmap_sem);
394 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100395 PROT_READ | PROT_EXEC,
396 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
397 MAP_EXECUTABLE | MAP_32BIT,
398 fd_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 up_write(&current->mm->mmap_sem);
400
401 if (error != N_TXTADDR(ex)) {
402 send_sig(SIGKILL, current, 0);
403 return error;
404 }
405
406 down_write(&current->mm->mmap_sem);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100407 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 PROT_READ | PROT_WRITE | PROT_EXEC,
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100409 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
410 MAP_EXECUTABLE | MAP_32BIT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 fd_offset + ex.a_text);
412 up_write(&current->mm->mmap_sem);
413 if (error != N_DATADDR(ex)) {
414 send_sig(SIGKILL, current, 0);
415 return error;
416 }
417 }
418beyond_if:
419 set_binfmt(&aout_format);
420
421 set_brk(current->mm->start_brk, current->mm->brk);
422
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700423 retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100424 if (retval < 0) {
425 /* Someone check-me: is this error path enough? */
426 send_sig(SIGKILL, current, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 return retval;
428 }
429
430 current->mm->start_stack =
431 (unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
432 /* start thread */
433 asm volatile("movl %0,%%fs" :: "r" (0)); \
434 asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS));
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100435 load_gs_index(0);
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100436 (regs)->ip = ex.a_entry;
437 (regs)->sp = current->mm->start_stack;
438 (regs)->flags = 0x200;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 (regs)->cs = __USER32_CS;
440 (regs)->ss = __USER32_DS;
Andi Kleenf891dd12007-10-17 18:04:33 +0200441 regs->r8 = regs->r9 = regs->r10 = regs->r11 =
442 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 set_fs(USER_DS);
444 if (unlikely(current->ptrace & PT_PTRACED)) {
445 if (current->ptrace & PT_TRACE_EXEC)
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100446 ptrace_notify((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 else
448 send_sig(SIGTRAP, current, 0);
449 }
450 return 0;
451}
452
453static int load_aout_library(struct file *file)
454{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100455 struct inode *inode;
456 unsigned long bss, start_addr, len, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 int retval;
458 struct exec ex;
459
Josef "Jeff" Sipekc9411922006-12-08 02:36:43 -0800460 inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
462 retval = -ENOEXEC;
463 error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
464 if (error != sizeof(ex))
465 goto out;
466
467 /* We come in here for the regular a.out style of shared libraries */
468 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
469 N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100470 i_size_read(inode) <
471 ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 goto out;
473 }
474
475 if (N_FLAGS(ex))
476 goto out;
477
478 /* For QMAGIC, the starting address is 0x20 into the page. We mask
479 this off to get the starting address for the page */
480
481 start_addr = ex.a_entry & 0xfffff000;
482
483 if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
484 loff_t pos = N_TXTOFF(ex);
485
486#ifdef WARN_OLD
487 static unsigned long error_time;
Julia Lawalle5fc3162008-01-30 13:32:17 +0100488 if (time_after(jiffies, error_time + 5*HZ)) {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100489 printk(KERN_WARNING
490 "N_TXTOFF is not page aligned. Please convert "
491 "library: %s\n",
Josef "Jeff" Sipekc9411922006-12-08 02:36:43 -0800492 file->f_path.dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 error_time = jiffies;
494 }
495#endif
496 down_write(&current->mm->mmap_sem);
497 do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
498 up_write(&current->mm->mmap_sem);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100499
Andi Kleen52d522f2006-09-26 10:52:33 +0200500 file->f_op->read(file, (char __user *)start_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 ex.a_text + ex.a_data, &pos);
502 flush_icache_range((unsigned long) start_addr,
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100503 (unsigned long) start_addr + ex.a_text +
504 ex.a_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 retval = 0;
507 goto out;
508 }
509 /* Now use mmap to map the library into memory. */
510 down_write(&current->mm->mmap_sem);
511 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
512 PROT_READ | PROT_WRITE | PROT_EXEC,
513 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
514 N_TXTOFF(ex));
515 up_write(&current->mm->mmap_sem);
516 retval = error;
517 if (error != start_addr)
518 goto out;
519
520 len = PAGE_ALIGN(ex.a_text + ex.a_data);
521 bss = ex.a_text + ex.a_data + ex.a_bss;
522 if (bss > len) {
523 down_write(&current->mm->mmap_sem);
524 error = do_brk(start_addr + len, bss - len);
525 up_write(&current->mm->mmap_sem);
526 retval = error;
527 if (error != start_addr + len)
528 goto out;
529 }
530 retval = 0;
531out:
532 return retval;
533}
534
535static int __init init_aout_binfmt(void)
536{
537 return register_binfmt(&aout_format);
538}
539
540static void __exit exit_aout_binfmt(void)
541{
542 unregister_binfmt(&aout_format);
543}
544
545module_init(init_aout_binfmt);
546module_exit(exit_aout_binfmt);
547MODULE_LICENSE("GPL");