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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / arch / sparc64 / kernel / binfmt_aout32.c
blobf205fc7cbcd0da686c38f732be25bf52740ee58d
1 /*
2 * linux/fs/binfmt_aout.c
3 *
4 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
5 *
6 * Hacked a bit by DaveM to make it work with 32-bit SunOS
7 * binaries on the sparc64 port.
8 */
9
10 #include <linux/module.h>
11
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/mman.h>
16 #include <linux/a.out.h>
17 #include <linux/errno.h>
18 #include <linux/signal.h>
19 #include <linux/string.h>
20 #include <linux/fs.h>
21 #include <linux/file.h>
22 #include <linux/stat.h>
23 #include <linux/fcntl.h>
24 #include <linux/ptrace.h>
25 #include <linux/user.h>
26 #include <linux/slab.h>
27 #include <linux/binfmts.h>
28 #include <linux/personality.h>
29 #include <linux/init.h>
30
31 #include <asm/system.h>
32 #include <asm/uaccess.h>
33 #include <asm/pgalloc.h>
34 #include <asm/mmu_context.h>
35
36 static int load_aout32_binary(struct linux_binprm *, struct pt_regs * regs);
37 static int load_aout32_library(struct file*);
38 static int aout32_core_dump(long signr, struct pt_regs * regs, struct file *file);
39
40 static struct linux_binfmt aout32_format = {
41 NULL, THIS_MODULE, load_aout32_binary, load_aout32_library, aout32_core_dump,
42 PAGE_SIZE
43 };
44
45 static void set_brk(unsigned long start, unsigned long end)
46 {
47 start = PAGE_ALIGN(start);
48 end = PAGE_ALIGN(end);
49 if (end <= start)
50 return;
51 down_write(&current->mm->mmap_sem);
52 do_brk(start, end - start);
53 up_write(&current->mm->mmap_sem);
54 }
55
56 /*
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.
59 */
60
61 static int dump_write(struct file *file, const void *addr, int nr)
62 {
63 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
64 }
65
66 #define DUMP_WRITE(addr, nr) \
67 if (!dump_write(file, (void *)(addr), (nr))) \
68 goto end_coredump;
69
70 #define DUMP_SEEK(offset) \
71 if (file->f_op->llseek) { \
72 if (file->f_op->llseek(file,(offset),0) != (offset)) \
73 goto end_coredump; \
74 } else file->f_pos = (offset)
75
76 /*
77 * Routine writes a core dump image in the current directory.
78 * Currently only a stub-function.
79 *
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..
84 */
85
86 static int aout32_core_dump(long signr, struct pt_regs *regs, struct file *file)
87 {
88 mm_segment_t fs;
89 int has_dumped = 0;
90 unsigned long dump_start, dump_size;
91 struct user dump;
92 # define START_DATA(u) (u.u_tsize)
93 # define START_STACK(u) ((regs->u_regs[UREG_FP]) & ~(PAGE_SIZE - 1))
94
95 fs = get_fs();
96 set_fs(KERNEL_DS);
97 has_dumped = 1;
98 current->flags |= PF_DUMPCORE;
99 strncpy(dump.u_comm, current->comm, sizeof(dump.u_comm));
100 dump.signal = signr;
101 dump_thread(regs, &dump);
102
103 /* If the size of the dump file exceeds the rlimit, then see what would happen
104 if we wrote the stack, but not the data area. */
105 if ((dump.u_dsize+dump.u_ssize) >
106 current->signal->rlim[RLIMIT_CORE].rlim_cur)
107 dump.u_dsize = 0;
108
109 /* Make sure we have enough room to write the stack and data areas. */
110 if ((dump.u_ssize) >
111 current->signal->rlim[RLIMIT_CORE].rlim_cur)
112 dump.u_ssize = 0;
113
114 /* make sure we actually have a data and stack area to dump */
115 set_fs(USER_DS);
116 if (!access_ok(VERIFY_READ, (void __user *) START_DATA(dump), dump.u_dsize))
117 dump.u_dsize = 0;
118 if (!access_ok(VERIFY_READ, (void __user *) START_STACK(dump), dump.u_ssize))
119 dump.u_ssize = 0;
120
121 set_fs(KERNEL_DS);
122 /* struct user */
123 DUMP_WRITE(&dump,sizeof(dump));
124 /* now we start writing out the user space info */
125 set_fs(USER_DS);
126 /* Dump the data area */
127 if (dump.u_dsize != 0) {
128 dump_start = START_DATA(dump);
129 dump_size = dump.u_dsize;
130 DUMP_WRITE(dump_start,dump_size);
131 }
132 /* Now prepare to dump the stack area */
133 if (dump.u_ssize != 0) {
134 dump_start = START_STACK(dump);
135 dump_size = dump.u_ssize;
136 DUMP_WRITE(dump_start,dump_size);
137 }
138 /* Finally dump the task struct. Not be used by gdb, but could be useful */
139 set_fs(KERNEL_DS);
140 DUMP_WRITE(current,sizeof(*current));
141 end_coredump:
142 set_fs(fs);
143 return has_dumped;
144 }
145
146 /*
147 * create_aout32_tables() parses the env- and arg-strings in new user
148 * memory and creates the pointer tables from them, and puts their
149 * addresses on the "stack", returning the new stack pointer value.
150 */
151
152 static u32 __user *create_aout32_tables(char __user *p, struct linux_binprm *bprm)
153 {
154 u32 __user *argv;
155 u32 __user *envp;
156 u32 __user *sp;
157 int argc = bprm->argc;
158 int envc = bprm->envc;
159
160 sp = (u32 __user *)((-(unsigned long)sizeof(char *))&(unsigned long)p);
161
162 /* This imposes the proper stack alignment for a new process. */
163 sp = (u32 __user *) (((unsigned long) sp) & ~7);
164 if ((envc+argc+3)&1)
165 --sp;
166
167 sp -= envc+1;
168 envp = sp;
169 sp -= argc+1;
170 argv = sp;
171 put_user(argc,--sp);
172 current->mm->arg_start = (unsigned long) p;
173 while (argc-->0) {
174 char c;
175 put_user(((u32)(unsigned long)(p)),argv++);
176 do {
177 get_user(c,p++);
178 } while (c);
179 }
180 put_user(NULL,argv);
181 current->mm->arg_end = current->mm->env_start = (unsigned long) p;
182 while (envc-->0) {
183 char c;
184 put_user(((u32)(unsigned long)(p)),envp++);
185 do {
186 get_user(c,p++);
187 } while (c);
188 }
189 put_user(NULL,envp);
190 current->mm->env_end = (unsigned long) p;
191 return sp;
192 }
193
194 /*
195 * These are the functions used to load a.out style executables and shared
196 * libraries. There is no binary dependent code anywhere else.
197 */
198
199 static int load_aout32_binary(struct linux_binprm * bprm, struct pt_regs * regs)
200 {
201 struct exec ex;
202 unsigned long error;
203 unsigned long fd_offset;
204 unsigned long rlim;
205 unsigned long orig_thr_flags;
206 int retval;
207
208 ex = *((struct exec *) bprm->buf); /* exec-header */
209 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != OMAGIC &&
210 N_MAGIC(ex) != QMAGIC && N_MAGIC(ex) != NMAGIC) ||
211 N_TRSIZE(ex) || N_DRSIZE(ex) ||
212 bprm->file->f_path.dentry->d_inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
213 return -ENOEXEC;
214 }
215
216 fd_offset = N_TXTOFF(ex);
217
218 /* Check initial limits. This avoids letting people circumvent
219 * size limits imposed on them by creating programs with large
220 * arrays in the data or bss.
221 */
222 rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur;
223 if (rlim >= RLIM_INFINITY)
224 rlim = ~0;
225 if (ex.a_data + ex.a_bss > rlim)
226 return -ENOMEM;
227
228 /* Flush all traces of the currently running executable */
229 retval = flush_old_exec(bprm);
230 if (retval)
231 return retval;
232
233 /* OK, This is the point of no return */
234 set_personality(PER_SUNOS);
235
236 current->mm->end_code = ex.a_text +
237 (current->mm->start_code = N_TXTADDR(ex));
238 current->mm->end_data = ex.a_data +
239 (current->mm->start_data = N_DATADDR(ex));
240 current->mm->brk = ex.a_bss +
241 (current->mm->start_brk = N_BSSADDR(ex));
242 current->mm->free_area_cache = current->mm->mmap_base;
243 current->mm->cached_hole_size = 0;
244
245 current->mm->mmap = NULL;
246 compute_creds(bprm);
247 current->flags &= ~PF_FORKNOEXEC;
248 if (N_MAGIC(ex) == NMAGIC) {
249 loff_t pos = fd_offset;
250 /* Fuck me plenty... */
251 down_write(&current->mm->mmap_sem);
252 error = do_brk(N_TXTADDR(ex), ex.a_text);
253 up_write(&current->mm->mmap_sem);
254 bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
255 ex.a_text, &pos);
256 down_write(&current->mm->mmap_sem);
257 error = do_brk(N_DATADDR(ex), ex.a_data);
258 up_write(&current->mm->mmap_sem);
259 bprm->file->f_op->read(bprm->file, (char __user *)N_DATADDR(ex),
260 ex.a_data, &pos);
261 goto beyond_if;
262 }
263
264 if (N_MAGIC(ex) == OMAGIC) {
265 loff_t pos = fd_offset;
266 down_write(&current->mm->mmap_sem);
267 do_brk(N_TXTADDR(ex) & PAGE_MASK,
268 ex.a_text+ex.a_data + PAGE_SIZE - 1);
269 up_write(&current->mm->mmap_sem);
270 bprm->file->f_op->read(bprm->file, (char __user *)N_TXTADDR(ex),
271 ex.a_text+ex.a_data, &pos);
272 } else {
273 static unsigned long error_time;
274 if ((ex.a_text & 0xfff || ex.a_data & 0xfff) &&
275 (N_MAGIC(ex) != NMAGIC) && (jiffies-error_time) > 5*HZ)
276 {
277 printk(KERN_NOTICE "executable not page aligned\n");
278 error_time = jiffies;
279 }
280
281 if (!bprm->file->f_op->mmap) {
282 loff_t pos = fd_offset;
283 down_write(&current->mm->mmap_sem);
284 do_brk(0, ex.a_text+ex.a_data);
285 up_write(&current->mm->mmap_sem);
286 bprm->file->f_op->read(bprm->file,
287 (char __user *)N_TXTADDR(ex),
288 ex.a_text+ex.a_data, &pos);
289 goto beyond_if;
290 }
291
292 down_write(&current->mm->mmap_sem);
293 error = do_mmap(bprm->file, N_TXTADDR(ex), ex.a_text,
294 PROT_READ | PROT_EXEC,
295 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
296 fd_offset);
297 up_write(&current->mm->mmap_sem);
298
299 if (error != N_TXTADDR(ex)) {
300 send_sig(SIGKILL, current, 0);
301 return error;
302 }
303
304 down_write(&current->mm->mmap_sem);
305 error = do_mmap(bprm->file, N_DATADDR(ex), ex.a_data,
306 PROT_READ | PROT_WRITE | PROT_EXEC,
307 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE,
308 fd_offset + ex.a_text);
309 up_write(&current->mm->mmap_sem);
310 if (error != N_DATADDR(ex)) {
311 send_sig(SIGKILL, current, 0);
312 return error;
313 }
314 }
315 beyond_if:
316 set_binfmt(&aout32_format);
317
318 set_brk(current->mm->start_brk, current->mm->brk);
319
320 /* Make sure STACK_TOP returns the right thing. */
321 orig_thr_flags = current_thread_info()->flags;
322 current_thread_info()->flags |= _TIF_32BIT;
323
324 retval = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
325 if (retval < 0) {
326 current_thread_info()->flags = orig_thr_flags;
327
328 /* Someone check-me: is this error path enough? */
329 send_sig(SIGKILL, current, 0);
330 return retval;
331 }
332
333 current->mm->start_stack =
334 (unsigned long) create_aout32_tables((char __user *)bprm->p, bprm);
335 tsb_context_switch(current->mm);
336
337 start_thread32(regs, ex.a_entry, current->mm->start_stack);
338 if (current->ptrace & PT_PTRACED)
339 send_sig(SIGTRAP, current, 0);
340 return 0;
341 }
342
343 /* N.B. Move to .h file and use code in fs/binfmt_aout.c? */
344 static int load_aout32_library(struct file *file)
345 {
346 struct inode * inode;
347 unsigned long bss, start_addr, len;
348 unsigned long error;
349 int retval;
350 struct exec ex;
351
352 inode = file->f_path.dentry->d_inode;
353
354 retval = -ENOEXEC;
355 error = kernel_read(file, 0, (char *) &ex, sizeof(ex));
356 if (error != sizeof(ex))
357 goto out;
358
359 /* We come in here for the regular a.out style of shared libraries */
360 if ((N_MAGIC(ex) != ZMAGIC && N_MAGIC(ex) != QMAGIC) || N_TRSIZE(ex) ||
361 N_DRSIZE(ex) || ((ex.a_entry & 0xfff) && N_MAGIC(ex) == ZMAGIC) ||
362 inode->i_size < ex.a_text+ex.a_data+N_SYMSIZE(ex)+N_TXTOFF(ex)) {
363 goto out;
364 }
365
366 if (N_MAGIC(ex) == ZMAGIC && N_TXTOFF(ex) &&
367 (N_TXTOFF(ex) < inode->i_sb->s_blocksize)) {
368 printk("N_TXTOFF < BLOCK_SIZE. Please convert library\n");
369 goto out;
370 }
371
372 if (N_FLAGS(ex))
373 goto out;
374
375 /* For QMAGIC, the starting address is 0x20 into the page. We mask
376 this off to get the starting address for the page */
377
378 start_addr = ex.a_entry & 0xfffff000;
379
380 /* Now use mmap to map the library into memory. */
381 down_write(&current->mm->mmap_sem);
382 error = do_mmap(file, start_addr, ex.a_text + ex.a_data,
383 PROT_READ | PROT_WRITE | PROT_EXEC,
384 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
385 N_TXTOFF(ex));
386 up_write(&current->mm->mmap_sem);
387 retval = error;
388 if (error != start_addr)
389 goto out;
390
391 len = PAGE_ALIGN(ex.a_text + ex.a_data);
392 bss = ex.a_text + ex.a_data + ex.a_bss;
393 if (bss > len) {
394 down_write(&current->mm->mmap_sem);
395 error = do_brk(start_addr + len, bss - len);
396 up_write(&current->mm->mmap_sem);
397 retval = error;
398 if (error != start_addr + len)
399 goto out;
400 }
401 retval = 0;
402 out:
403 return retval;
404 }
405
406 static int __init init_aout32_binfmt(void)
407 {
408 return register_binfmt(&aout32_format);
409 }
410
411 static void __exit exit_aout32_binfmt(void)
412 {
413 unregister_binfmt(&aout32_format);
414 }
415
416 module_init(init_aout32_binfmt);
417 module_exit(exit_aout32_binfmt);
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