blob: 2d93bdbc9ac026f2c0ef1e3fcd9c9a208b609787 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/binfmts.h>
25#include <linux/personality.h>
26#include <linux/init.h>
Julia Lawalle5fc3162008-01-30 13:32:17 +010027#include <linux/jiffies.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
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
Linus Torvalds0eead9ab2010-10-14 10:57:40 -070037#undef CORE_DUMP /* definitely broken */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010039static int load_aout_binary(struct linux_binprm *, struct pt_regs *regs);
40static int load_aout_library(struct file *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Olaf Hering44456d32005-07-27 11:45:17 -070042#ifdef CORE_DUMP
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010043static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
44 unsigned long limit);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46/*
47 * fill in the user structure for a core dump..
48 */
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010049static void dump_thread32(struct pt_regs *regs, struct user32 *dump)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010051 u32 fs, gs;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/* changed the size calculations - should hopefully work better. lbt */
54 dump->magic = CMAGIC;
55 dump->start_code = 0;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010056 dump->start_stack = regs->sp & ~(PAGE_SIZE - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010058 dump->u_dsize = ((unsigned long)
59 (current->mm->brk + (PAGE_SIZE-1))) >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 dump->u_dsize -= dump->u_tsize;
61 dump->u_ssize = 0;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010062 dump->u_debugreg[0] = current->thread.debugreg0;
63 dump->u_debugreg[1] = current->thread.debugreg1;
64 dump->u_debugreg[2] = current->thread.debugreg2;
65 dump->u_debugreg[3] = current->thread.debugreg3;
66 dump->u_debugreg[4] = 0;
67 dump->u_debugreg[5] = 0;
68 dump->u_debugreg[6] = current->thread.debugreg6;
69 dump->u_debugreg[7] = current->thread.debugreg7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Thomas Gleixner8edf8be2008-01-30 13:30:07 +010071 if (dump->start_stack < 0xc0000000) {
72 unsigned long tmp;
73
74 tmp = (unsigned long) (0xc0000000 - dump->start_stack);
75 dump->u_ssize = tmp >> PAGE_SHIFT;
76 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010078 dump->regs.bx = regs->bx;
79 dump->regs.cx = regs->cx;
80 dump->regs.dx = regs->dx;
81 dump->regs.si = regs->si;
82 dump->regs.di = regs->di;
83 dump->regs.bp = regs->bp;
84 dump->regs.ax = regs->ax;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 dump->regs.ds = current->thread.ds;
86 dump->regs.es = current->thread.es;
Jeremy Fitzhardingeb6edbb12008-08-19 13:04:19 -070087 savesegment(fs, fs);
88 dump->regs.fs = fs;
89 savesegment(gs, gs);
90 dump->regs.gs = gs;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010091 dump->regs.orig_ax = regs->orig_ax;
92 dump->regs.ip = regs->ip;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 dump->regs.cs = regs->cs;
H. Peter Anvin65ea5b02008-01-30 13:30:56 +010094 dump->regs.flags = regs->flags;
95 dump->regs.sp = regs->sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 dump->regs.ss = regs->ss;
97
98#if 1 /* FIXME */
99 dump->u_fpvalid = 0;
100#else
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100101 dump->u_fpvalid = dump_fpu(regs, &dump->i387);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#endif
103}
104
105#endif
106
107static struct linux_binfmt aout_format = {
108 .module = THIS_MODULE,
109 .load_binary = load_aout_binary,
110 .load_shlib = load_aout_library,
Olaf Hering44456d32005-07-27 11:45:17 -0700111#ifdef CORE_DUMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 .core_dump = aout_core_dump,
113#endif
114 .min_coredump = PAGE_SIZE
115};
116
117static void set_brk(unsigned long start, unsigned long end)
118{
119 start = PAGE_ALIGN(start);
120 end = PAGE_ALIGN(end);
121 if (end <= start)
122 return;
123 down_write(&current->mm->mmap_sem);
124 do_brk(start, end - start);
125 up_write(&current->mm->mmap_sem);
126}
127
Olaf Hering44456d32005-07-27 11:45:17 -0700128#ifdef CORE_DUMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129/*
130 * These are the only things you should do on a core-file: use only these
131 * macros to write out all the necessary info.
132 */
133
Linus Torvalds0eead9ab2010-10-14 10:57:40 -0700134#include <linux/coredump.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100136#define DUMP_WRITE(addr, nr) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (!dump_write(file, (void *)(addr), (nr))) \
138 goto end_coredump;
139
Linus Torvalds0eead9ab2010-10-14 10:57:40 -0700140#define DUMP_SEEK(offset) \
141 if (!dump_seek(file, offset)) \
142 goto end_coredump;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100143
144#define START_DATA() (u.u_tsize << PAGE_SHIFT)
145#define START_STACK(u) (u.start_stack)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147/*
148 * Routine writes a core dump image in the current directory.
149 * Currently only a stub-function.
150 *
151 * Note that setuid/setgid files won't make a core-dump if the uid/gid
152 * changed due to the set[u|g]id. It's enforced by the "current->mm->dumpable"
153 * field, which also makes sure the core-dumps won't be recursive if the
154 * dumping of the process results in another error..
155 */
156
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100157static int aout_core_dump(long signr, struct pt_regs *regs, struct file *file,
158 unsigned long limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160 mm_segment_t fs;
161 int has_dumped = 0;
162 unsigned long dump_start, dump_size;
163 struct user32 dump;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 fs = get_fs();
166 set_fs(KERNEL_DS);
167 has_dumped = 1;
168 current->flags |= PF_DUMPCORE;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100169 strncpy(dump.u_comm, current->comm, sizeof(current->comm));
H. Peter Anvin6e16d892008-02-07 00:15:57 -0800170 dump.u_ar0 = offsetof(struct user32, regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 dump.signal = signr;
172 dump_thread32(regs, &dump);
173
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100174 /*
175 * If the size of the dump file exceeds the rlimit, then see
176 * what would happen if we wrote the stack, but not the data
177 * area.
178 */
Neil Horman7dc0b222007-10-16 23:26:34 -0700179 if ((dump.u_dsize + dump.u_ssize + 1) * PAGE_SIZE > limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 dump.u_dsize = 0;
181
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100182 /* Make sure we have enough room to write the stack and data areas. */
Neil Horman7dc0b222007-10-16 23:26:34 -0700183 if ((dump.u_ssize + 1) * PAGE_SIZE > limit)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 dump.u_ssize = 0;
185
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100186 /* make sure we actually have a data and stack area to dump */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 set_fs(USER_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100188 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_DATA(dump),
189 dump.u_dsize << PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 dump.u_dsize = 0;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100191 if (!access_ok(VERIFY_READ, (void *) (unsigned long)START_STACK(dump),
192 dump.u_ssize << PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 dump.u_ssize = 0;
194
195 set_fs(KERNEL_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100196 /* struct user */
197 DUMP_WRITE(&dump, sizeof(dump));
198 /* Now dump all of the user data. Include malloced stuff as well */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 DUMP_SEEK(PAGE_SIZE);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100200 /* now we start writing out the user space info */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 set_fs(USER_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100202 /* Dump the data area */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (dump.u_dsize != 0) {
204 dump_start = START_DATA(dump);
205 dump_size = dump.u_dsize << PAGE_SHIFT;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100206 DUMP_WRITE(dump_start, dump_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 }
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100208 /* Now prepare to dump the stack area */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 if (dump.u_ssize != 0) {
210 dump_start = START_STACK(dump);
211 dump_size = dump.u_ssize << PAGE_SHIFT;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100212 DUMP_WRITE(dump_start, dump_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214end_coredump:
215 set_fs(fs);
216 return has_dumped;
217}
218#endif
219
220/*
221 * create_aout_tables() parses the env- and arg-strings in new user
222 * memory and creates the pointer tables from them, and puts their
223 * addresses on the "stack", returning the new stack pointer value.
224 */
225static u32 __user *create_aout_tables(char __user *p, struct linux_binprm *bprm)
226{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100227 u32 __user *argv, *envp, *sp;
228 int argc = bprm->argc, envc = bprm->envc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
230 sp = (u32 __user *) ((-(unsigned long)sizeof(u32)) & (unsigned long) p);
231 sp -= envc+1;
232 envp = sp;
233 sp -= argc+1;
234 argv = sp;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100235 put_user((unsigned long) envp, --sp);
236 put_user((unsigned long) argv, --sp);
237 put_user(argc, --sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 current->mm->arg_start = (unsigned long) p;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100239 while (argc-- > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 char c;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100241
242 put_user((u32)(unsigned long)p, argv++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 do {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100244 get_user(c, p++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 } while (c);
246 }
Andi Kleen74019692007-01-11 01:52:45 +0100247 put_user(0, argv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100249 while (envc-- > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 char c;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100251
252 put_user((u32)(unsigned long)p, envp++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 do {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100254 get_user(c, p++);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 } while (c);
256 }
Andi Kleen74019692007-01-11 01:52:45 +0100257 put_user(0, envp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 current->mm->env_end = (unsigned long) p;
259 return sp;
260}
261
262/*
263 * These are the functions used to load a.out style executables and shared
264 * libraries. There is no binary dependent code anywhere else.
265 */
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100266static int load_aout_binary(struct linux_binprm *bprm, struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100268 unsigned long error, fd_offset, rlim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 struct exec ex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 int retval;
271
272 ex = *((struct exec *) bprm->buf); /* exec-header */
273 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
274 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
275 N_TRSIZE(ex) || N_DRSIZE(ex) ||
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100276 i_size_read(bprm->file->f_path.dentry->d_inode) <
277 ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return -ENOEXEC;
279 }
280
281 fd_offset = N_TXTOFF(ex);
282
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.
286 */
Jiri Slaby2854e722010-01-27 17:32:22 +0100287 rlim = rlimit(RLIMIT_DATA);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 if (rlim >= RLIM_INFINITY)
289 rlim = ~0;
290 if (ex.a_data + ex.a_bss > rlim)
291 return -ENOMEM;
292
293 /* Flush all traces of the currently running executable */
294 retval = flush_old_exec(bprm);
295 if (retval)
296 return retval;
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 /* OK, This is the point of no return */
299 set_personality(PER_LINUX);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100300 set_thread_flag(TIF_IA32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
Linus Torvalds221af7f2010-01-28 22:14:42 -0800302 setup_new_exec(bprm);
303
304 regs->cs = __USER32_CS;
305 regs->r8 = regs->r9 = regs->r10 = regs->r11 = regs->r12 =
306 regs->r13 = regs->r14 = regs->r15 = 0;
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 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;
Wolfgang Wander1363c3c2005-06-21 17:14:49 -0700315 current->mm->cached_hole_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
David Howellsa6f76f22008-11-14 10:39:24 +1100317 install_exec_creds(bprm);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100318 current->flags &= ~PF_FORKNOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 if (N_MAGIC(ex) == OMAGIC) {
321 unsigned long text_addr, map_size;
322 loff_t pos;
323
324 text_addr = N_TXTADDR(ex);
325
326 pos = 32;
327 map_size = ex.a_text+ex.a_data;
328
329 down_write(&current->mm->mmap_sem);
330 error = do_brk(text_addr & PAGE_MASK, map_size);
331 up_write(&current->mm->mmap_sem);
332
333 if (error != (text_addr & PAGE_MASK)) {
334 send_sig(SIGKILL, current, 0);
335 return error;
336 }
337
Andi Kleen52d522f2006-09-26 10:52:33 +0200338 error = bprm->file->f_op->read(bprm->file,
339 (char __user *)text_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 ex.a_text+ex.a_data, &pos);
341 if ((signed long)error < 0) {
342 send_sig(SIGKILL, current, 0);
343 return error;
344 }
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 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) &&
Julia Lawalle5fc3162008-01-30 13:32:17 +0100351 (N_MAGIC(ex) != NMAGIC) &&
352 time_after(jiffies, error_time2 + 5*HZ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 printk(KERN_NOTICE "executable not page aligned\n");
354 error_time2 = jiffies;
355 }
356
357 if ((fd_offset & ~PAGE_MASK) != 0 &&
Julia Lawalle5fc3162008-01-30 13:32:17 +0100358 time_after(jiffies, error_time + 5*HZ)) {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100359 printk(KERN_WARNING
360 "fd_offset is not page aligned. Please convert "
361 "program: %s\n",
Josef "Jeff" Sipekc9411922006-12-08 02:36:43 -0800362 bprm->file->f_path.dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 error_time = jiffies;
364 }
365#endif
366
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100367 if (!bprm->file->f_op->mmap || (fd_offset & ~PAGE_MASK) != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 loff_t pos = fd_offset;
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 down_write(&current->mm->mmap_sem);
371 do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
372 up_write(&current->mm->mmap_sem);
Andi Kleen52d522f2006-09-26 10:52:33 +0200373 bprm->file->f_op->read(bprm->file,
374 (char __user *)N_TXTADDR(ex),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 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
382 down_write(&current->mm->mmap_sem);
383 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100384 PROT_READ | PROT_EXEC,
385 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
386 MAP_EXECUTABLE | MAP_32BIT,
387 fd_offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 up_write(&current->mm->mmap_sem);
389
390 if (error != N_TXTADDR(ex)) {
391 send_sig(SIGKILL, current, 0);
392 return error;
393 }
394
395 down_write(&current->mm->mmap_sem);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100396 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 PROT_READ | PROT_WRITE | PROT_EXEC,
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100398 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE |
399 MAP_EXECUTABLE | MAP_32BIT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 fd_offset + ex.a_text);
401 up_write(&current->mm->mmap_sem);
402 if (error != N_DATADDR(ex)) {
403 send_sig(SIGKILL, current, 0);
404 return error;
405 }
406 }
407beyond_if:
408 set_binfmt(&aout_format);
409
410 set_brk(current->mm->start_brk, current->mm->brk);
411
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700412 retval = setup_arg_pages(bprm, IA32_STACK_TOP, EXSTACK_DEFAULT);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100413 if (retval < 0) {
414 /* Someone check-me: is this error path enough? */
415 send_sig(SIGKILL, current, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 return retval;
417 }
418
419 current->mm->start_stack =
420 (unsigned long)create_aout_tables((char __user *)bprm->p, bprm);
421 /* start thread */
Jeremy Fitzhardingeb6edbb12008-08-19 13:04:19 -0700422 loadsegment(fs, 0);
423 loadsegment(ds, __USER32_DS);
424 loadsegment(es, __USER32_DS);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100425 load_gs_index(0);
H. Peter Anvin65ea5b02008-01-30 13:30:56 +0100426 (regs)->ip = ex.a_entry;
427 (regs)->sp = current->mm->start_stack;
428 (regs)->flags = 0x200;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 (regs)->cs = __USER32_CS;
430 (regs)->ss = __USER32_DS;
Andi Kleenf891dd12007-10-17 18:04:33 +0200431 regs->r8 = regs->r9 = regs->r10 = regs->r11 =
432 regs->r12 = regs->r13 = regs->r14 = regs->r15 = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 set_fs(USER_DS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 return 0;
435}
436
437static int load_aout_library(struct file *file)
438{
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100439 struct inode *inode;
440 unsigned long bss, start_addr, len, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 int retval;
442 struct exec ex;
443
Josef "Jeff" Sipekc9411922006-12-08 02:36:43 -0800444 inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
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) ||
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100454 i_size_read(inode) <
455 ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 goto out;
457 }
458
459 if (N_FLAGS(ex))
460 goto out;
461
462 /* For QMAGIC, the starting address is 0x20 into the page. We mask
463 this off to get the starting address for the page */
464
465 start_addr = ex.a_entry & 0xfffff000;
466
467 if ((N_TXTOFF(ex) & ~PAGE_MASK) != 0) {
468 loff_t pos = N_TXTOFF(ex);
469
470#ifdef WARN_OLD
471 static unsigned long error_time;
Julia Lawalle5fc3162008-01-30 13:32:17 +0100472 if (time_after(jiffies, error_time + 5*HZ)) {
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100473 printk(KERN_WARNING
474 "N_TXTOFF is not page aligned. Please convert "
475 "library: %s\n",
Josef "Jeff" Sipekc9411922006-12-08 02:36:43 -0800476 file->f_path.dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 error_time = jiffies;
478 }
479#endif
480 down_write(&current->mm->mmap_sem);
481 do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
482 up_write(&current->mm->mmap_sem);
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100483
Andi Kleen52d522f2006-09-26 10:52:33 +0200484 file->f_op->read(file, (char __user *)start_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 ex.a_text + ex.a_data, &pos);
486 flush_icache_range((unsigned long) start_addr,
Thomas Gleixner8edf8be2008-01-30 13:30:07 +0100487 (unsigned long) start_addr + ex.a_text +
488 ex.a_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
490 retval = 0;
491 goto out;
492 }
493 /* Now use mmap to map the library into memory. */
494 down_write(&current->mm->mmap_sem);
495 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
496 PROT_READ | PROT_WRITE | PROT_EXEC,
497 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_32BIT,
498 N_TXTOFF(ex));
499 up_write(&current->mm->mmap_sem);
500 retval = error;
501 if (error != start_addr)
502 goto out;
503
504 len = PAGE_ALIGN(ex.a_text + ex.a_data);
505 bss = ex.a_text + ex.a_data + ex.a_bss;
506 if (bss > len) {
507 down_write(&current->mm->mmap_sem);
508 error = do_brk(start_addr + len, bss - len);
509 up_write(&current->mm->mmap_sem);
510 retval = error;
511 if (error != start_addr + len)
512 goto out;
513 }
514 retval = 0;
515out:
516 return retval;
517}
518
519static int __init init_aout_binfmt(void)
520{
521 return register_binfmt(&aout_format);
522}
523
524static void __exit exit_aout_binfmt(void)
525{
526 unregister_binfmt(&aout_format);
527}
528
529module_init(init_aout_binfmt);
530module_exit(exit_aout_binfmt);
531MODULE_LICENSE("GPL");