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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/x86_64/ia32/ia32_aout.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/x86_64/ia32/ia32_aout.c')
-rw-r--r--arch/x86_64/ia32/ia32_aout.c529
1 files changed, 529 insertions, 0 deletions
diff --git a/arch/x86_64/ia32/ia32_aout.c b/arch/x86_64/ia32/ia32_aout.c
new file mode 100644
index 000000000000..1965efc974dc
--- /dev/null
+++ b/arch/x86_64/ia32/ia32_aout.c
@@ -0,0 +1,529 @@
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>
24#include <linux/slab.h>
25#include <linux/binfmts.h>
26#include <linux/personality.h>
27#include <linux/init.h>
28
29#include <asm/system.h>
30#include <asm/uaccess.h>
31#include <asm/pgalloc.h>
32#include <asm/cacheflush.h>
33#include <asm/user32.h>
34#include <asm/ia32.h>
35
36#undef WARN_OLD
37#undef CORE_DUMP /* probably broken */
38
39extern int ia32_setup_arg_pages(struct linux_binprm *bprm,
40 unsigned long stack_top, int exec_stack);
41
42static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
43static int load_aout_library(struct file*);
44
45#if CORE_DUMP
46static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file);
47
48/*
49 * fill in the user structure for a core dump..
50 */
51static void dump_thread32(struct pt_regs * regs, struct user32 * dump)
52{
53 u32 fs,gs;
54
55/* changed the size calculations - should hopefully work better. lbt */
56 dump->magic = CMAGIC;
57 dump->start_code = 0;
58 dump->start_stack = regs->rsp & ~(PAGE_SIZE - 1);
59 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
60 dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
61 dump->u_dsize -= dump->u_tsize;
62 dump->u_ssize = 0;
63 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;
71
72 if (dump->start_stack < 0xc0000000)
73 dump->u_ssize = ((unsigned long) (0xc0000000 - dump->start_stack)) >> PAGE_SHIFT;
74
75 dump->regs.ebx = regs->rbx;
76 dump->regs.ecx = regs->rcx;
77 dump->regs.edx = regs->rdx;
78 dump->regs.esi = regs->rsi;
79 dump->regs.edi = regs->rdi;
80 dump->regs.ebp = regs->rbp;
81 dump->regs.eax = regs->rax;
82 dump->regs.ds = current->thread.ds;
83 dump->regs.es = current->thread.es;
84 asm("movl %%fs,%0" : "=r" (fs)); dump->regs.fs = fs;
85 asm("movl %%gs,%0" : "=r" (gs)); dump->regs.gs = gs;
86 dump->regs.orig_eax = regs->orig_rax;
87 dump->regs.eip = regs->rip;
88 dump->regs.cs = regs->cs;
89 dump->regs.eflags = regs->eflags;
90 dump->regs.esp = regs->rsp;
91 dump->regs.ss = regs->ss;
92
93#if 1 /* FIXME */
94 dump->u_fpvalid = 0;
95#else
96 dump->u_fpvalid = dump_fpu (regs, &dump->i387);
97#endif
98}
99
100#endif
101
102static struct linux_binfmt aout_format = {
103 .module = THIS_MODULE,
104 .load_binary = load_aout_binary,
105 .load_shlib = load_aout_library,
106#if CORE_DUMP
107 .core_dump = aout_core_dump,
108#endif
109 .min_coredump = PAGE_SIZE
110};
111
112static void set_brk(unsigned long start, unsigned long end)
113{
114 start = PAGE_ALIGN(start);
115 end = PAGE_ALIGN(end);
116 if (end <= start)
117 return;
118 down_write(&current->mm->mmap_sem);
119 do_brk(start, end - start);
120 up_write(&current->mm->mmap_sem);
121}
122
123#if CORE_DUMP
124/*
125 * These are the only things you should do on a core-file: use only these
126 * macros to write out all the necessary info.
127 */
128
129static int dump_write(struct file *file, const void *addr, int nr)
130{
131 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
132}
133
134#define DUMP_WRITE(addr, nr) \
135 if (!dump_write(file, (void *)(addr), (nr))) \
136 goto end_coredump;
137
138#define DUMP_SEEK(offset) \
139if (file->f_op->llseek) { \
140 if (file->f_op->llseek(file,(offset),0) != (offset)) \
141 goto end_coredump; \
142} else file->f_pos = (offset)
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
154static int aout_core_dump(long signr, struct pt_regs * regs, struct file *file)
155{
156 mm_segment_t fs;
157 int has_dumped = 0;
158 unsigned long dump_start, dump_size;
159 struct user32 dump;
160# define START_DATA(u) (u.u_tsize << PAGE_SHIFT)
161# define START_STACK(u) (u.start_stack)
162
163 fs = get_fs();
164 set_fs(KERNEL_DS);
165 has_dumped = 1;
166 current->flags |= PF_DUMPCORE;
167 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
168 dump.u_ar0 = (u32)(((unsigned long)(&dump.regs)) - ((unsigned long)(&dump)));
169 dump.signal = signr;
170 dump_thread32(regs, &dump);
171
172/* If the size of the dump file exceeds the rlimit, then see what would happen
173 if we wrote the stack, but not the data area. */
174 if ((dump.u_dsize+dump.u_ssize+1) * PAGE_SIZE >
175 current->signal->rlim[RLIMIT_CORE].rlim_cur)
176 dump.u_dsize = 0;
177
178/* Make sure we have enough room to write the stack and data areas. */
179 if ((dump.u_ssize+1) * PAGE_SIZE >
180 current->signal->rlim[RLIMIT_CORE].rlim_cur)
181 dump.u_ssize = 0;
182
183/* make sure we actually have a data and stack area to dump */
184 set_fs(USER_DS);
185 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump), dump.u_dsize << PAGE_SHIFT))
186 dump.u_dsize = 0;
187 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump), dump.u_ssize << PAGE_SHIFT))
188 dump.u_ssize = 0;
189
190 set_fs(KERNEL_DS);
191/* struct user */
192 DUMP_WRITE(&dump,sizeof(dump));
193/* Now dump all of the user data. Include malloced stuff as well */
194 DUMP_SEEK(PAGE_SIZE);
195/* now we start writing out the user space info */
196 set_fs(USER_DS);
197/* Dump the data area */
198 if (dump.u_dsize != 0) {
199 dump_start = START_DATA(dump);
200 dump_size = dump.u_dsize << PAGE_SHIFT;
201 DUMP_WRITE(dump_start,dump_size);
202 }
203/* Now prepare to dump the stack area */
204 if (dump.u_ssize != 0) {
205 dump_start = START_STACK(dump);
206 dump_size = dump.u_ssize << PAGE_SHIFT;
207 DUMP_WRITE(dump_start,dump_size);
208 }
209/* Finally dump the task struct. Not be used by gdb, but could be useful */
210 set_fs(KERNEL_DS);
211 DUMP_WRITE(current,sizeof(*current));
212end_coredump:
213 set_fs(fs);
214 return has_dumped;
215}
216#endif
217
218/*
219 * create_aout_tables() parses the env- and arg-strings in new user
220 * memory and creates the pointer tables from them, and puts their
221 * addresses on the "stack", returning the new stack pointer value.
222 */
223static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
224{
225 u32 __user *argv;
226 u32 __user *envp;
227 u32 __user *sp;
228 int argc = bprm->argc;
229 int envc = bprm->envc;
230
231 sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
232 sp -= envc+1;
233 envp = sp;
234 sp -= argc+1;
235 argv = sp;
236 put_user((unsigned long) envp,--sp);
237 put_user((unsigned long) argv,--sp);
238 put_user(argc,--sp);
239 current->mm->arg_start = (unsigned long) p;
240 while (argc-->0) {
241 char c;
242 put_user((u32)(unsigned long)p,argv++);
243 do {
244 get_user(c,p++);
245 } while (c);
246 }
247 put_user(NULL,argv);
248 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
249 while (envc-->0) {
250 char c;
251 put_user((u32)(unsigned long)p,envp++);
252 do {
253 get_user(c,p++);
254 } while (c);
255 }
256 put_user(NULL,envp);
257 current->mm->env_end = (unsigned long) p;
258 return sp;
259}
260
261/*
262 * These are the functions used to load a.out style executables and shared
263 * libraries. There is no binary dependent code anywhere else.
264 */
265
266static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
267{
268 struct exec ex;
269 unsigned long error;
270 unsigned long fd_offset;
271 unsigned long rlim;
272 int retval;
273
274 ex = *((struct exec *) bprm->buf); /* exec-header */
275 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
276 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
277 N_TRSIZE(ex) || N_DRSIZE(ex) ||
278 i_size_read(bprm->file->f_dentry->d_inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
279 return -ENOEXEC;
280 }
281
282 fd_offset = N_TXTOFF(ex);
283
284 /* Check initial limits. This avoids letting people circumvent
285 * size limits imposed on them by creating programs with large
286 * arrays in the data or bss.
287 */
288 rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
289 if (rlim >= RLIM_INFINITY)
290 rlim = ~0;
291 if (ex.a_data + ex.a_bss > rlim)
292 return -ENOMEM;
293
294 /* Flush all traces of the currently running executable */
295 retval = flush_old_exec(bprm);
296 if (retval)
297 return retval;
298
299 regs->cs = __USER32_CS;
300 regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
301 regs->r13 = regs->r14 = regs->r15 = 0;
302
303 /* OK, This is the point of no return */
304 set_personality(PER_LINUX);
305 set_thread_flag(TIF_IA32);
306 clear_thread_flag(TIF_ABI_PENDING);
307
308 current->mm->end_code = ex.a_text +
309 (current->mm->start_code = N_TXTADDR(ex));
310 current->mm->end_data = ex.a_data +
311 (current->mm->start_data = N_DATADDR(ex));
312 current->mm->brk = ex.a_bss +
313 (current->mm->start_brk = N_BSSADDR(ex));
314 current->mm->free_area_cache = TASK_UNMAPPED_BASE;
315
316 set_mm_counter(current->mm, rss, 0);
317 current->mm->mmap = NULL;
318 compute_creds(bprm);
319 current->flags &= ~PF_FORKNOEXEC;
320
321 if (N_MAGIC(ex) == OMAGIC) {
322 unsigned long text_addr, map_size;
323 loff_t pos;
324
325 text_addr = N_TXTADDR(ex);
326
327 pos = 32;
328 map_size = ex.a_text+ex.a_data;
329
330 down_write(&current->mm->mmap_sem);
331 error = do_brk(text_addr & PAGE_MASK, map_size);
332 up_write(&current->mm->mmap_sem);
333
334 if (error != (text_addr & PAGE_MASK)) {
335 send_sig(SIGKILL, current, 0);
336 return error;
337 }
338
339 error = bprm->file->f_op->read(bprm->file, (char *)text_addr,
340 ex.a_text+ex.a_data, &pos);
341 if ((signed long)error < 0) {
342 send_sig(SIGKILL, current, 0);
343 return error;
344 }
345
346 flush_icache_range(text_addr, text_addr+ex.a_text+ex.a_data);
347 } else {
348#ifdef WARN_OLD
349 static unsigned long error_time, error_time2;
350 if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
351 (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time2) > 5*HZ)
352 {
353 printk(KERN_NOTICE "executable not page aligned\n");
354 error_time2 = jiffies;
355 }
356
357 if ((fd_offset & ~PAGE_MASK) != 0 &&
358 (jiffies-error_time) > 5*HZ)
359 {
360 printk(KERN_WARNING
361 "fd_offset is not page aligned. Please convert program: %s\n",
362 bprm->file->f_dentry->d_name.name);
363 error_time = jiffies;
364 }
365#endif
366
367 if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
368 loff_t pos = fd_offset;
369 down_write(&current->mm->mmap_sem);
370 do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
371 up_write(&current->mm->mmap_sem);
372 bprm->file->f_op->read(bprm->file,(char *)N_TXTADDR(ex),
373 ex.a_text+ex.a_data, &pos);
374 flush_icache_range((unsigned long) N_TXTADDR(ex),
375 (unsigned long) N_TXTADDR(ex) +
376 ex.a_text+ex.a_data);
377 goto beyond_if;
378 }
379
380 down_write(&current->mm->mmap_sem);
381 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
382 PROT_READ | PROT_EXEC,
383 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE | MAP_32BIT,
384 fd_offset);
385 up_write(&current->mm->mmap_sem);
386
387 if (error != N_TXTADDR(ex)) {
388 send_sig(SIGKILL, current, 0);
389 return error;
390 }
391
392 down_write(&current->mm->mmap_sem);
393 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
394 PROT_READ | PROT_WRITE | PROT_EXEC,
395 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE | MAP_32BIT,
396 fd_offset + ex.a_text);
397 up_write(&current->mm->mmap_sem);
398 if (error != N_DATADDR(ex)) {
399 send_sig(SIGKILL, current, 0);
400 return error;
401 }
402 }
403beyond_if:
404 set_binfmt(&aout_format);
405
406 set_brk(current->mm->start_brk, current->mm->brk);
407
408 retval = ia32_setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
409 if (retval < 0) {
410 /* Someone check-me: is this error path enough? */
411 send_sig(SIGKILL, current, 0);
412 return retval;
413 }
414
415 current->mm->start_stack =
416 (unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
417 /* start thread */
418 asm volatile("movl %0,%%fs" :: "r" (0)); \
419 asm volatile("movl %0,%%es; movl %0,%%ds": :"r" (__USER32_DS));
420 load_gs_index(0);
421 (regs)->rip = ex.a_entry;
422 (regs)->rsp = current->mm->start_stack;
423 (regs)->eflags = 0x200;
424 (regs)->cs = __USER32_CS;
425 (regs)->ss = __USER32_DS;
426 set_fs(USER_DS);
427 if (unlikely(current->ptrace & PT_PTRACED)) {
428 if (current->ptrace & PT_TRACE_EXEC)
429 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
430 else
431 send_sig(SIGTRAP, current, 0);
432 }
433 return 0;
434}
435
436static int load_aout_library(struct file *file)
437{
438 struct inode * inode;
439 unsigned long bss, start_addr, len;
440 unsigned long error;
441 int retval;
442 struct exec ex;
443
444 inode = file->f_dentry->d_inode;
445
446 retval = -ENOEXEC;
447 error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
448 if (error != sizeof(ex))
449 goto out;
450
451 /* We come in here for the regular a.out style of shared libraries */
452 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
453 N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
454 i_size_read(inode) < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
455 goto out;
456 }
457
458 if (N_FLAGS(ex))
459 goto out;
460
461 /* For QMAGIC, the starting address is 0x20 into the page. We mask
462 this off to get the starting address for the page */
463
464 start_addr = ex.a_entry & 0xfffff000;
465
466 if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
467 loff_t pos = N_TXTOFF(ex);
468
469#ifdef WARN_OLD
470 static unsigned long error_time;
471 if ((jiffies-error_time) > 5*HZ)
472 {
473 printk(KERN_WARNING
474 "N_TXTOFF is not page aligned. Please convert library: %s\n",
475 file->f_dentry->d_name.name);
476 error_time = jiffies;
477 }
478#endif
479 down_write(&current->mm->mmap_sem);
480 do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
481 up_write(&current->mm->mmap_sem);
482
483 file->f_op->read(file, (char *)start_addr,
484 ex.a_text + ex.a_data, &pos);
485 flush_icache_range((unsigned long) start_addr,
486 (unsigned long) start_addr + ex.a_text + ex.a_data);
487
488 retval = 0;
489 goto out;
490 }
491 /* Now use mmap to map the library into memory. */
492 down_write(&current->mm->mmap_sem);
493 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
494 PROT_READ | PROT_WRITE | PROT_EXEC,
495 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
496 N_TXTOFF(ex));
497 up_write(&current->mm->mmap_sem);
498 retval = error;
499 if (error != start_addr)
500 goto out;
501
502 len = PAGE_ALIGN(ex.a_text + ex.a_data);
503 bss = ex.a_text + ex.a_data + ex.a_bss;
504 if (bss > len) {
505 down_write(&current->mm->mmap_sem);
506 error = do_brk(start_addr + len, bss - len);
507 up_write(&current->mm->mmap_sem);
508 retval = error;
509 if (error != start_addr + len)
510 goto out;
511 }
512 retval = 0;
513out:
514 return retval;
515}
516
517static int __init init_aout_binfmt(void)
518{
519 return register_binfmt(&aout_format);
520}
521
522static void __exit exit_aout_binfmt(void)
523{
524 unregister_binfmt(&aout_format);
525}
526
527module_init(init_aout_binfmt);
528module_exit(exit_aout_binfmt);
529MODULE_LICENSE("GPL");