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 static void set_brk(unsigned long start, unsigned long end)
49 start = PAGE_ALIGN(start);
50 end = PAGE_ALIGN(end);
53 do_brk(start, end - start);
57 * These are the only things you should do on a core-file: use only these
58 * macros to write out all the necessary info.
61 static int dump_write(struct file *file, const void *addr, int nr)
63 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
66 #define DUMP_WRITE(addr, nr) \
67 if (!dump_write(file, (void *)(addr), (nr))) \
70 #define DUMP_SEEK(offset) \
71 if (file->f_op->llseek) { \
72 if (file->f_op->llseek(file,(offset),0) != (offset)) \
74 } else file->f_pos = (offset)
77 * Routine writes a core dump image in the current directory.
78 * Currently only a stub-function.
80 * Note that setuid/setgid files won't make a core-dump if the uid/gid
81 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
82 * field, which also makes sure the core-dumps won't be recursive if the
83 * dumping of the process results in another error..
86 static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file)
90 unsigned long dump_start, dump_size;
92 #if defined(__alpha__)
93 # define START_DATA(u) (u.start_data)
94 #elif defined(__arm__)
95 # define START_DATA(u) ((u.u_tsize << PAGE_SHIFT) + u.start_code)
96 #elif defined(__sparc__)
97 # define START_DATA(u) (u.u_tsize)
98 #elif defined(__i386__) || defined(__mc68000__) || defined(__arch_um__)
99 # define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
102 # define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
104 # define START_STACK(u) (u.start_stack)
110 current->flags |= PF_DUMPCORE;
111 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
113 dump.u_ar0 = (void *)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
116 dump_thread(regs, &dump);
118 /* If the size of the dump file exceeds the rlimit, then see what would happen
119 if we wrote the stack, but not the data area. */
121 if ((dump.u_dsize+dump.u_ssize) >
122 current->rlim[RLIMIT_CORE].rlim_cur)
125 if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE >
126 current->rlim[RLIMIT_CORE].rlim_cur)
130 /* Make sure we have enough room to write the stack and data areas. */
133 current->rlim[RLIMIT_CORE].rlim_cur)
136 if ((dump.u_ssize+1) * PAGE_SIZE >
137 current->rlim[RLIMIT_CORE].rlim_cur)
141 /* make sure we actually have a data and stack area to dump */
144 if (verify_area(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize))
146 if (verify_area(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize))
149 if (verify_area(VERIFY_READ, (void __user *)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
151 if (verify_area(VERIFY_READ, (void __user *)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
157 DUMP_WRITE(&dump,sizeof(dump));
158 /* Now dump all of the user data. Include malloced stuff as well */
160 DUMP_SEEK(PAGE_SIZE);
162 /* now we start writing out the user space info */
164 /* Dump the data area */
165 if (dump.u_dsize != 0) {
166 dump_start = START_DATA(dump);
168 dump_size = dump.u_dsize;
170 dump_size = dump.u_dsize << PAGE_SHIFT;
172 DUMP_WRITE(dump_start,dump_size);
174 /* Now prepare to dump the stack area */
175 if (dump.u_ssize != 0) {
176 dump_start = START_STACK(dump);
178 dump_size = dump.u_ssize;
180 dump_size = dump.u_ssize << PAGE_SHIFT;
182 DUMP_WRITE(dump_start,dump_size);
184 /* Finally dump the task struct. Not be used by gdb, but could be useful */
186 DUMP_WRITE(current,sizeof(*current));
193 * create_aout_tables() parses the env- and arg-strings in new user
194 * memory and creates the pointer tables from them, and puts their
195 * addresses on the "stack", returning the new stack pointer value.
197 static unsigned long __user *create_aout_tables(char __user *p, struct linux_binprm * bprm)
199 char __user * __user *argv;
200 char __user * __user *envp;
201 unsigned long __user *sp;
202 int argc = bprm->argc;
203 int envc = bprm->envc;
205 sp = (void __user *)((-(unsigned long)sizeof(char *)) & (unsigned long) p);
207 /* This imposes the proper stack alignment for a new process. */
208 sp = (void __user *) (((unsigned long) sp) & ~7);
209 if ((envc+argc+3)&1) --sp;
212 /* whee.. test-programs are so much fun. */
217 put_user(0x3eb, --sp);
218 put_user(bprm->loader, --sp);
219 put_user(0x3ea, --sp);
221 put_user(bprm->exec, --sp);
222 put_user(0x3e9, --sp);
225 envp = (char __user * __user *) sp;
227 argv = (char __user * __user *) sp;
228 #if defined(__i386__) || defined(__mc68000__) || defined(__arm__) || defined(__arch_um__)
229 put_user((unsigned long) envp,--sp);
230 put_user((unsigned long) argv,--sp);
233 current->mm->arg_start = (unsigned long) p;
242 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
251 current->mm->env_end = (unsigned long) p;
256 * These are the functions used to load a.out style executables and shared
257 * libraries. There is no binary dependent code anywhere else.
260 static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
264 unsigned long fd_offset;
268 ex = *((struct exec *) bprm->buf); /* exec-header */
269 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
270 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
271 N_TRSIZE(ex) || N_DRSIZE(ex) ||
272 i_size_read(bprm->file->f_dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
276 fd_offset = N_TXTOFF(ex);
278 /* Check initial limits. This avoids letting people circumvent
279 * size limits imposed on them by creating programs with large
280 * arrays in the data or bss.
282 rlim = current->rlim[RLIMIT_DATA].rlim_cur;
283 if (rlim >= RLIM_INFINITY)
285 if (ex.a_data + ex.a_bss > rlim)
288 /* Flush all traces of the currently running executable */
289 retval = flush_old_exec(bprm);
293 /* OK, This is the point of no return */
294 #if defined(__alpha__)
295 SET_AOUT_PERSONALITY(bprm, ex);
296 #elif defined(__sparc__)
297 set_personality(PER_SUNOS);
298 #if !defined(__sparc_v9__)
299 memcpy(¤t->thread.core_exec, &ex, sizeof(struct exec));
302 set_personality(PER_LINUX);
305 current->mm->end_code = ex.a_text +
306 (current->mm->start_code = N_TXTADDR(ex));
307 current->mm->end_data = ex.a_data +
308 (current->mm->start_data = N_DATADDR(ex));
309 current->mm->brk = ex.a_bss +
310 (current->mm->start_brk = N_BSSADDR(ex));
311 current->mm->free_area_cache = TASK_UNMAPPED_BASE;
313 // current->mm->rss = 0;
314 vx_rsspages_sub(current->mm, current->mm->rss);
315 current->mm->mmap = NULL;
317 current->flags &= ~PF_FORKNOEXEC;
319 if (N_MAGIC(ex) == NMAGIC) {
320 loff_t pos = fd_offset;
321 /* Fuck me plenty... */
323 error = do_brk(N_TXTADDR(ex), ex.a_text);
324 bprm->file->f_op->read(bprm->file, (char *) N_TXTADDR(ex),
326 error = do_brk(N_DATADDR(ex), ex.a_data);
327 bprm->file->f_op->read(bprm->file, (char *) N_DATADDR(ex),
333 if (N_MAGIC(ex) == OMAGIC) {
334 unsigned long text_addr, map_size;
337 text_addr = N_TXTADDR(ex);
339 #if defined(__alpha__) || defined(__sparc__)
341 map_size = ex.a_text+ex.a_data + PAGE_SIZE - 1;
344 map_size = ex.a_text+ex.a_data;
347 error = do_brk(text_addr & PAGE_MASK, map_size);
348 if (error != (text_addr & PAGE_MASK)) {
349 send_sig(SIGKILL, current, 0);
353 error = bprm->file->f_op->read(bprm->file,
354 (char __user *)text_addr,
355 ex.a_text+ex.a_data, &pos);
356 if ((signed long)error < 0) {
357 send_sig(SIGKILL, current, 0);
361 flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
363 static unsigned long error_time, error_time2;
364 if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
365 (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ)
367 printk(KERN_NOTICE "executable not page aligned\n");
368 error_time2 = jiffies;
371 if ((fd_offset & ~PAGE_MASK) != 0 &&
372 (jiffies-error_time) > 5*HZ)
375 "fd_offset is not page aligned. Please convert program: %s\n",
376 bprm->file->f_dentry->d_name.name);
377 error_time = jiffies;
380 if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
381 loff_t pos = fd_offset;
382 do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
383 bprm->file->f_op->read(bprm->file,
384 (char __user *)N_TXTADDR(ex),
385 ex.a_text+ex.a_data, &pos);
386 flush_icache_range((unsigned long) N_TXTADDR(ex),
387 (unsigned long) N_TXTADDR(ex) +
388 ex.a_text+ex.a_data);
392 down_write(¤t->mm->mmap_sem);
393 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
394 PROT_READ | PROT_EXEC,
395 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
397 up_write(¤t->mm->mmap_sem);
399 if (error != N_TXTADDR(ex)) {
400 send_sig(SIGKILL, current, 0);
404 down_write(¤t->mm->mmap_sem);
405 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
406 PROT_READ | PROT_WRITE | PROT_EXEC,
407 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
408 fd_offset + ex.a_text);
409 up_write(¤t->mm->mmap_sem);
410 if (error != N_DATADDR(ex)) {
411 send_sig(SIGKILL, current, 0);
416 set_binfmt(&aout_format);
418 set_brk(current->mm->start_brk, current->mm->brk);
420 retval = setup_arg_pages(bprm, EXSTACK_DEFAULT);
422 /* Someone check-me: is this error path enough? */
423 send_sig(SIGKILL, current, 0);
427 current->mm->start_stack =
428 (unsigned long) create_aout_tables((char __user *) bprm->p, bprm);
430 regs->gp = ex.a_gpvalue;
432 start_thread(regs, ex.a_entry, current->mm->start_stack);
433 if (unlikely(current->ptrace & PT_PTRACED)) {
434 if (current->ptrace & PT_TRACE_EXEC)
435 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
437 send_sig(SIGTRAP, current, 0);
442 static int load_aout_library(struct file *file)
444 struct inode * inode;
445 unsigned long bss, start_addr, len;
450 inode = file->f_dentry->d_inode;
453 error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
454 if (error != sizeof(ex))
457 /* We come in here for the regular a.out style of shared libraries */
458 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
459 N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
460 i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
467 /* For QMAGIC, the starting address is 0x20 into the page. We mask
468 this off to get the starting address for the page */
470 start_addr = ex.a_entry & 0xfffff000;
472 if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
473 static unsigned long error_time;
474 loff_t pos = N_TXTOFF(ex);
476 if ((jiffies-error_time) > 5*HZ)
479 "N_TXTOFF is not page aligned. Please convert library: %s\n",
480 file->f_dentry->d_name.name);
481 error_time = jiffies;
484 do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
486 file->f_op->read(file, (char __user *)start_addr,
487 ex.a_text + ex.a_data, &pos);
488 flush_icache_range((unsigned long) start_addr,
489 (unsigned long) start_addr + ex.a_text + ex.a_data);
494 /* Now use mmap to map the library into memory. */
495 down_write(¤t->mm->mmap_sem);
496 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
497 PROT_READ | PROT_WRITE | PROT_EXEC,
498 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
500 up_write(¤t->mm->mmap_sem);
502 if (error != start_addr)
505 len = PAGE_ALIGN(ex.a_text + ex.a_data);
506 bss = ex.a_text + ex.a_data + ex.a_bss;
508 error = do_brk(start_addr + len, bss - len);
510 if (error != start_addr + len)
518 static int __init init_aout_binfmt(void)
520 return register_binfmt(&aout_format);
523 static void __exit exit_aout_binfmt(void)
525 unregister_binfmt(&aout_format);
528 core_initcall(init_aout_binfmt);
529 module_exit(exit_aout_binfmt);
530 MODULE_LICENSE("GPL");