2 * linux/fs/binfmt_aout.c
4 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
7 #include <linux/module.h>
9 #include <linux/time.h>
10 #include <linux/kernel.h>
12 #include <linux/mman.h>
13 #include <linux/a.out.h>
14 #include <linux/errno.h>
15 #include <linux/signal.h>
16 #include <linux/string.h>
18 #include <linux/file.h>
19 #include <linux/stat.h>
20 #include <linux/fcntl.h>
21 #include <linux/ptrace.h>
22 #include <linux/user.h>
23 #include <linux/slab.h>
24 #include <linux/binfmts.h>
25 #include <linux/personality.h>
26 #include <linux/init.h>
27 #include <linux/vs_memory.h>
29 #include <asm/system.h>
30 #include <asm/uaccess.h>
31 #include <asm/cacheflush.h>
33 static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
34 static int load_aout_library(struct file*);
35 static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file);
37 extern void dump_thread(struct pt_regs *, struct user *);
39 static struct linux_binfmt aout_format = {
40 .module = THIS_MODULE,
41 .load_binary = load_aout_binary,
42 .load_shlib = load_aout_library,
43 .core_dump = aout_core_dump,
44 .min_coredump = PAGE_SIZE
47 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
49 static int set_brk(unsigned long start, unsigned long end)
51 start = PAGE_ALIGN(start);
52 end = PAGE_ALIGN(end);
54 unsigned long addr = do_brk(start, end - start);
62 * These are the only things you should do on a core-file: use only these
63 * macros to write out all the necessary info.
66 static int dump_write(struct file *file, const void *addr, int nr)
68 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
71 #define DUMP_WRITE(addr, nr) \
72 if (!dump_write(file, (void *)(addr), (nr))) \
75 #define DUMP_SEEK(offset) \
76 if (file->f_op->llseek) { \
77 if (file->f_op->llseek(file,(offset),0) != (offset)) \
79 } else file->f_pos = (offset)
82 * Routine writes a core dump image in the current directory.
83 * Currently only a stub-function.
85 * Note that setuid/setgid files won't make a core-dump if the uid/gid
86 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
87 * field, which also makes sure the core-dumps won't be recursive if the
88 * dumping of the process results in another error..
91 static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file)
95 unsigned long dump_start, dump_size;
97 #if defined(__alpha__)
98 # define START_DATA(u) (u.start_data)
99 #elif defined(__arm__)
100 # define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code)
101 #elif defined(__sparc__)
102 # define START_DATA(u) (u.u_tsize)
103 #elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__)
104 # define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
107 # define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
109 # define START_STACK(u) (u.start_stack)
115 current->flags |= PF_DUMPCORE;
116 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
118 dump.u_ar0 = (void *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
121 dump_thread(regs, &dump);
123 /* If the size of the dump file exceeds the rlimit, then see what would happen
124 if we wrote the stack, but not the data area. */
126 if ((dump.u_dsize+dump.u_ssize) >
127 current->rlim[RLIMIT_CORE].rlim_cur)
130 if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE >
131 current->rlim[RLIMIT_CORE].rlim_cur)
135 /* Make sure we have enough room to write the stack and data areas. */
138 current->rlim[RLIMIT_CORE].rlim_cur)
141 if ((dump.u_ssize+1) * PAGE_SIZE >
142 current->rlim[RLIMIT_CORE].rlim_cur)
146 /* make sure we actually have a data and stack area to dump */
149 if (verify_area(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize))
151 if (verify_area(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize))
154 if (verify_area(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
156 if (verify_area(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
162 DUMP_WRITE(&dump,sizeof(dump));
163 /* Now dump all of the user data. Include malloced stuff as well */
165 DUMP_SEEK(PAGE_SIZE);
167 /* now we start writing out the user space info */
169 /* Dump the data area */
170 if (dump.u_dsize != 0) {
171 dump_start = START_DATA(dump);
173 dump_size = dump.u_dsize;
175 dump_size = dump.u_dsize << PAGE_SHIFT;
177 DUMP_WRITE(dump_start,dump_size);
179 /* Now prepare to dump the stack area */
180 if (dump.u_ssize != 0) {
181 dump_start = START_STACK(dump);
183 dump_size = dump.u_ssize;
185 dump_size = dump.u_ssize << PAGE_SHIFT;
187 DUMP_WRITE(dump_start,dump_size);
189 /* Finally dump the task struct. Not be used by gdb, but could be useful */
191 DUMP_WRITE(current,sizeof(*current));
198 * create_aout_tables() parses the env- and arg-strings in new user
199 * memory and creates the pointer tables from them, and puts their
200 * addresses on the "stack", returning the new stack pointer value.
202 static unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
204 char __user * __user *argv;
205 char __user * __user *envp;
206 unsigned long __user *sp;
207 int argc = bprm->argc;
208 int envc = bprm->envc;
210 sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
212 /* This imposes the proper stack alignment for a new process. */
213 sp = (void __user *) (((unsigned long) sp) & ~7);
214 if ((envc+argc+3)&1) --sp;
217 /* whee.. test-programs are so much fun. */
222 put_user(0x3eb, --sp);
223 put_user(bprm->loader, --sp);
224 put_user(0x3ea, --sp);
226 put_user(bprm->exec, --sp);
227 put_user(0x3e9, --sp);
230 envp = (char __user * __user *) sp;
232 argv = (char __user * __user *) sp;
233 #if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__)
234 put_user((unsigned long) envp,--sp);
235 put_user((unsigned long) argv,--sp);
238 current->mm->arg_start = (unsigned long) p;
247 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
256 current->mm->env_end = (unsigned long) p;
261 * These are the functions used to load a.out style executables and shared
262 * libraries. There is no binary dependent code anywhere else.
265 static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
269 unsigned long fd_offset;
273 ex = *((struct exec *) bprm->buf); /* exec-header */
274 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
275 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
276 N_TRSIZE(ex) || N_DRSIZE(ex) ||
277 i_size_read(bprm->file->f_dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
281 fd_offset = N_TXTOFF(ex);
283 /* Check initial limits. This avoids letting people circumvent
284 * size limits imposed on them by creating programs with large
285 * arrays in the data or bss.
287 rlim = current->rlim[RLIMIT_DATA].rlim_cur;
288 if (rlim >= RLIM_INFINITY)
290 if (ex.a_data + ex.a_bss > rlim)
293 /* Flush all traces of the currently running executable */
294 retval = flush_old_exec(bprm);
298 /* OK, This is the point of no return */
299 #if defined(__alpha__)
300 SET_AOUT_PERSONALITY(bprm, ex);
301 #elif defined(__sparc__)
302 set_personality(PER_SUNOS);
303 #if !defined(__sparc_v9__)
304 memcpy(¤t->thread.core_exec, &ex, sizeof(struct exec));
307 set_personality(PER_LINUX);
310 current->mm->end_code = ex.a_text +
311 (current->mm->start_code = N_TXTADDR(ex));
312 current->mm->end_data = ex.a_data +
313 (current->mm->start_data = N_DATADDR(ex));
314 current->mm->brk = ex.a_bss +
315 (current->mm->start_brk = N_BSSADDR(ex));
316 current->mm->free_area_cache = current->mm->mmap_base;
318 // current->mm->rss = 0;
319 vx_rsspages_sub(current->mm, current->mm->rss);
320 current->mm->mmap = NULL;
322 current->flags &= ~PF_FORKNOEXEC;
324 if (N_MAGIC(ex) == NMAGIC) {
325 loff_t pos = fd_offset;
326 /* Fuck me plenty... */
328 error = do_brk(N_TXTADDR(ex), ex.a_text);
329 bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
331 error = do_brk(N_DATADDR(ex), ex.a_data);
332 bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
338 if (N_MAGIC(ex) == OMAGIC) {
339 unsigned long text_addr, map_size;
342 text_addr = N_TXTADDR(ex);
344 #if defined(__alpha__) || defined(__sparc__)
346 map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
349 map_size = ex.a_text+ex.a_data;
352 error = do_brk(text_addr & PAGE_MASK, map_size);
353 if (error != (text_addr & PAGE_MASK)) {
354 send_sig(SIGKILL, current, 0);
358 error = bprm->file->f_op->read(bprm->file,
359 (char __user *)text_addr,
360 ex.a_text+ex.a_data, &pos);
361 if ((signed long)error < 0) {
362 send_sig(SIGKILL, current, 0);
366 flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
368 static unsigned long error_time, error_time2;
369 if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
370 (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ)
372 printk(KERN_NOTICE "executable not page aligned\n");
373 error_time2 = jiffies;
376 if ((fd_offset & ~PAGE_MASK) != 0 &&
377 (jiffies-error_time) > 5*HZ)
380 "fd_offset is not page aligned. Please convert program: %s\n",
381 bprm->file->f_dentry->d_name.name);
382 error_time = jiffies;
385 if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
386 loff_t pos = fd_offset;
387 do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
388 bprm->file->f_op->read(bprm->file,
389 (char __user *)N_TXTADDR(ex),
390 ex.a_text+ex.a_data, &pos);
391 flush_icache_range((unsigned long) N_TXTADDR(ex),
392 (unsigned long) N_TXTADDR(ex) +
393 ex.a_text+ex.a_data);
397 down_write(¤t->mm->mmap_sem);
398 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
399 PROT_READ | PROT_EXEC,
400 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
402 up_write(¤t->mm->mmap_sem);
404 if (error != N_TXTADDR(ex)) {
405 send_sig(SIGKILL, current, 0);
409 down_write(¤t->mm->mmap_sem);
410 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
411 PROT_READ | PROT_WRITE | PROT_EXEC,
412 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
413 fd_offset + ex.a_text);
414 up_write(¤t->mm->mmap_sem);
415 if (error != N_DATADDR(ex)) {
416 send_sig(SIGKILL, current, 0);
421 set_binfmt(&aout_format);
423 retval = set_brk(current->mm->start_brk, current->mm->brk);
425 send_sig(SIGKILL, current, 0);
429 retval = setup_arg_pages(bprm, EXSTACK_DEFAULT);
431 /* Someone check-me: is this error path enough? */
432 send_sig(SIGKILL, current, 0);
436 current->mm->start_stack =
437 (unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
439 regs->gp = ex.a_gpvalue;
441 start_thread(regs, ex.a_entry, current->mm->start_stack);
442 if (unlikely(current->ptrace & PT_PTRACED)) {
443 if (current->ptrace & PT_TRACE_EXEC)
444 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
446 send_sig(SIGTRAP, current, 0);
451 static int load_aout_library(struct file *file)
453 struct inode * inode;
454 unsigned long bss, start_addr, len;
459 inode = file->f_dentry->d_inode;
462 error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
463 if (error != sizeof(ex))
466 /* We come in here for the regular a.out style of shared libraries */
467 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
468 N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
469 i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
476 /* For QMAGIC, the starting address is 0x20 into the page. We mask
477 this off to get the starting address for the page */
479 start_addr = ex.a_entry & 0xfffff000;
481 if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
482 static unsigned long error_time;
483 loff_t pos = N_TXTOFF(ex);
485 if ((jiffies-error_time) > 5*HZ)
488 "N_TXTOFF is not page aligned. Please convert library: %s\n",
489 file->f_dentry->d_name.name);
490 error_time = jiffies;
493 do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
495 file->f_op->read(file, (char __user *)start_addr,
496 ex.a_text + ex.a_data, &pos);
497 flush_icache_range((unsigned long) start_addr,
498 (unsigned long) start_addr + ex.a_text + ex.a_data);
503 /* Now use mmap to map the library into memory. */
504 down_write(¤t->mm->mmap_sem);
505 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
506 PROT_READ | PROT_WRITE | PROT_EXEC,
507 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
509 up_write(¤t->mm->mmap_sem);
511 if (error != start_addr)
514 len = PAGE_ALIGN(ex.a_text + ex.a_data);
515 bss = ex.a_text + ex.a_data + ex.a_bss;
517 error = do_brk(start_addr + len, bss - len);
519 if (error != start_addr + len)
527 static int __init init_aout_binfmt(void)
529 return register_binfmt(&aout_format);
532 static void __exit exit_aout_binfmt(void)
534 unregister_binfmt(&aout_format);
537 core_initcall(init_aout_binfmt);
538 module_exit(exit_aout_binfmt);
539 MODULE_LICENSE("GPL");