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1da177e4 LT |
1 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
2 | * | |
8a2ab7f5 | 3 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * Derived from binfmt_elf.c | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | ||
15 | #include <linux/fs.h> | |
16 | #include <linux/stat.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/mman.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/signal.h> | |
22 | #include <linux/binfmts.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/file.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/highmem.h> | |
28 | #include <linux/personality.h> | |
29 | #include <linux/ptrace.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/smp_lock.h> | |
32 | #include <linux/elf.h> | |
33 | #include <linux/elf-fdpic.h> | |
34 | #include <linux/elfcore.h> | |
35 | ||
36 | #include <asm/uaccess.h> | |
37 | #include <asm/param.h> | |
38 | #include <asm/pgalloc.h> | |
39 | ||
40 | typedef char *elf_caddr_t; | |
41 | #ifndef elf_addr_t | |
42 | #define elf_addr_t unsigned long | |
43 | #endif | |
44 | ||
45 | #if 0 | |
46 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
47 | #else | |
48 | #define kdebug(fmt, ...) do {} while(0) | |
49 | #endif | |
50 | ||
51 | MODULE_LICENSE("GPL"); | |
52 | ||
8a2ab7f5 DH |
53 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
54 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); | |
55 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, | |
56 | struct mm_struct *, const char *); | |
1da177e4 | 57 | |
8a2ab7f5 DH |
58 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
59 | struct elf_fdpic_params *, | |
60 | struct elf_fdpic_params *); | |
1da177e4 LT |
61 | |
62 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
63 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
64 | unsigned long *); | |
65 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, | |
66 | struct file *, | |
67 | struct mm_struct *); | |
1da177e4 LT |
68 | #endif |
69 | ||
8a2ab7f5 DH |
70 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
71 | struct file *, struct mm_struct *); | |
1da177e4 LT |
72 | |
73 | static struct linux_binfmt elf_fdpic_format = { | |
74 | .module = THIS_MODULE, | |
75 | .load_binary = load_elf_fdpic_binary, | |
1da177e4 LT |
76 | // .core_dump = elf_fdpic_core_dump, |
77 | .min_coredump = ELF_EXEC_PAGESIZE, | |
78 | }; | |
79 | ||
8a2ab7f5 DH |
80 | static int __init init_elf_fdpic_binfmt(void) |
81 | { | |
82 | return register_binfmt(&elf_fdpic_format); | |
83 | } | |
1da177e4 | 84 | |
8a2ab7f5 DH |
85 | static void __exit exit_elf_fdpic_binfmt(void) |
86 | { | |
87 | unregister_binfmt(&elf_fdpic_format); | |
88 | } | |
89 | ||
90 | module_init(init_elf_fdpic_binfmt); | |
91 | module_exit(exit_elf_fdpic_binfmt); | |
1da177e4 LT |
92 | |
93 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) | |
94 | { | |
95 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
96 | return 0; | |
97 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
98 | return 0; | |
99 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) | |
100 | return 0; | |
101 | if (!file->f_op || !file->f_op->mmap) | |
102 | return 0; | |
103 | return 1; | |
104 | } | |
105 | ||
106 | /*****************************************************************************/ | |
107 | /* | |
108 | * read the program headers table into memory | |
109 | */ | |
8a2ab7f5 DH |
110 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
111 | struct file *file) | |
1da177e4 LT |
112 | { |
113 | struct elf32_phdr *phdr; | |
114 | unsigned long size; | |
115 | int retval, loop; | |
116 | ||
117 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
118 | return -ENOMEM; | |
119 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
120 | return -ENOMEM; | |
121 | ||
122 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
123 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
124 | if (!params->phdrs) | |
125 | return -ENOMEM; | |
126 | ||
8a2ab7f5 DH |
127 | retval = kernel_read(file, params->hdr.e_phoff, |
128 | (char *) params->phdrs, size); | |
1da177e4 LT |
129 | if (retval < 0) |
130 | return retval; | |
131 | ||
132 | /* determine stack size for this binary */ | |
133 | phdr = params->phdrs; | |
134 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
135 | if (phdr->p_type != PT_GNU_STACK) | |
136 | continue; | |
137 | ||
138 | if (phdr->p_flags & PF_X) | |
139 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
140 | else | |
141 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
142 | ||
143 | params->stack_size = phdr->p_memsz; | |
144 | break; | |
145 | } | |
146 | ||
147 | return 0; | |
8a2ab7f5 | 148 | } |
1da177e4 LT |
149 | |
150 | /*****************************************************************************/ | |
151 | /* | |
152 | * load an fdpic binary into various bits of memory | |
153 | */ | |
8a2ab7f5 DH |
154 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
155 | struct pt_regs *regs) | |
1da177e4 LT |
156 | { |
157 | struct elf_fdpic_params exec_params, interp_params; | |
158 | struct elf_phdr *phdr; | |
8a2ab7f5 DH |
159 | unsigned long stack_size, entryaddr; |
160 | #ifndef CONFIG_MMU | |
161 | unsigned long fullsize; | |
162 | #endif | |
163 | #ifdef ELF_FDPIC_PLAT_INIT | |
164 | unsigned long dynaddr; | |
165 | #endif | |
1da177e4 LT |
166 | struct file *interpreter = NULL; /* to shut gcc up */ |
167 | char *interpreter_name = NULL; | |
168 | int executable_stack; | |
169 | int retval, i; | |
170 | ||
171 | memset(&exec_params, 0, sizeof(exec_params)); | |
172 | memset(&interp_params, 0, sizeof(interp_params)); | |
173 | ||
174 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
175 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
176 | ||
177 | /* check that this is a binary we know how to deal with */ | |
178 | retval = -ENOEXEC; | |
179 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) | |
180 | goto error; | |
181 | ||
182 | /* read the program header table */ | |
183 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
184 | if (retval < 0) | |
185 | goto error; | |
186 | ||
187 | /* scan for a program header that specifies an interpreter */ | |
188 | phdr = exec_params.phdrs; | |
189 | ||
190 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
191 | switch (phdr->p_type) { | |
192 | case PT_INTERP: | |
193 | retval = -ENOMEM; | |
194 | if (phdr->p_filesz > PATH_MAX) | |
195 | goto error; | |
196 | retval = -ENOENT; | |
197 | if (phdr->p_filesz < 2) | |
198 | goto error; | |
199 | ||
200 | /* read the name of the interpreter into memory */ | |
792db3af | 201 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
202 | if (!interpreter_name) |
203 | goto error; | |
204 | ||
205 | retval = kernel_read(bprm->file, | |
206 | phdr->p_offset, | |
207 | interpreter_name, | |
208 | phdr->p_filesz); | |
209 | if (retval < 0) | |
210 | goto error; | |
211 | ||
212 | retval = -ENOENT; | |
213 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
214 | goto error; | |
215 | ||
216 | kdebug("Using ELF interpreter %s", interpreter_name); | |
217 | ||
218 | /* replace the program with the interpreter */ | |
219 | interpreter = open_exec(interpreter_name); | |
220 | retval = PTR_ERR(interpreter); | |
221 | if (IS_ERR(interpreter)) { | |
222 | interpreter = NULL; | |
223 | goto error; | |
224 | } | |
225 | ||
8a2ab7f5 DH |
226 | retval = kernel_read(interpreter, 0, bprm->buf, |
227 | BINPRM_BUF_SIZE); | |
1da177e4 LT |
228 | if (retval < 0) |
229 | goto error; | |
230 | ||
231 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
232 | break; | |
233 | ||
234 | case PT_LOAD: | |
235 | #ifdef CONFIG_MMU | |
236 | if (exec_params.load_addr == 0) | |
237 | exec_params.load_addr = phdr->p_vaddr; | |
238 | #endif | |
239 | break; | |
240 | } | |
241 | ||
242 | } | |
243 | ||
244 | if (elf_check_const_displacement(&exec_params.hdr)) | |
245 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
246 | ||
247 | /* perform insanity checks on the interpreter */ | |
248 | if (interpreter_name) { | |
249 | retval = -ELIBBAD; | |
250 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) | |
251 | goto error; | |
252 | ||
253 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
254 | ||
255 | /* read the interpreter's program header table */ | |
256 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
257 | if (retval < 0) | |
258 | goto error; | |
259 | } | |
260 | ||
261 | stack_size = exec_params.stack_size; | |
262 | if (stack_size < interp_params.stack_size) | |
263 | stack_size = interp_params.stack_size; | |
264 | ||
265 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
266 | executable_stack = EXSTACK_ENABLE_X; | |
267 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
268 | executable_stack = EXSTACK_DISABLE_X; | |
269 | else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
270 | executable_stack = EXSTACK_ENABLE_X; | |
271 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
272 | executable_stack = EXSTACK_DISABLE_X; | |
273 | else | |
274 | executable_stack = EXSTACK_DEFAULT; | |
275 | ||
276 | retval = -ENOEXEC; | |
277 | if (stack_size == 0) | |
278 | goto error; | |
279 | ||
280 | if (elf_check_const_displacement(&interp_params.hdr)) | |
281 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
282 | ||
283 | /* flush all traces of the currently running executable */ | |
284 | retval = flush_old_exec(bprm); | |
285 | if (retval) | |
286 | goto error; | |
287 | ||
288 | /* there's now no turning back... the old userspace image is dead, | |
289 | * defunct, deceased, etc. after this point we have to exit via | |
290 | * error_kill */ | |
291 | set_personality(PER_LINUX_FDPIC); | |
292 | set_binfmt(&elf_fdpic_format); | |
293 | ||
294 | current->mm->start_code = 0; | |
295 | current->mm->end_code = 0; | |
296 | current->mm->start_stack = 0; | |
297 | current->mm->start_data = 0; | |
298 | current->mm->end_data = 0; | |
299 | current->mm->context.exec_fdpic_loadmap = 0; | |
300 | current->mm->context.interp_fdpic_loadmap = 0; | |
301 | ||
302 | current->flags &= ~PF_FORKNOEXEC; | |
303 | ||
304 | #ifdef CONFIG_MMU | |
305 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
306 | &interp_params, | |
307 | ¤t->mm->start_stack, | |
308 | ¤t->mm->start_brk); | |
1da177e4 | 309 | |
8a2ab7f5 DH |
310 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
311 | executable_stack); | |
1da177e4 LT |
312 | if (retval < 0) { |
313 | send_sig(SIGKILL, current, 0); | |
314 | goto error_kill; | |
315 | } | |
316 | #endif | |
317 | ||
318 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
319 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
320 | "executable"); | |
1da177e4 LT |
321 | if (retval < 0) |
322 | goto error_kill; | |
323 | ||
324 | if (interpreter_name) { | |
325 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
326 | current->mm, "interpreter"); | |
327 | if (retval < 0) { | |
328 | printk(KERN_ERR "Unable to load interpreter\n"); | |
329 | goto error_kill; | |
330 | } | |
331 | ||
332 | allow_write_access(interpreter); | |
333 | fput(interpreter); | |
334 | interpreter = NULL; | |
335 | } | |
336 | ||
337 | #ifdef CONFIG_MMU | |
338 | if (!current->mm->start_brk) | |
339 | current->mm->start_brk = current->mm->end_data; | |
340 | ||
8a2ab7f5 DH |
341 | current->mm->brk = current->mm->start_brk = |
342 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
343 | |
344 | #else | |
345 | /* create a stack and brk area big enough for everyone | |
346 | * - the brk heap starts at the bottom and works up | |
347 | * - the stack starts at the top and works down | |
348 | */ | |
349 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; | |
350 | if (stack_size < PAGE_SIZE * 2) | |
351 | stack_size = PAGE_SIZE * 2; | |
352 | ||
353 | down_write(¤t->mm->mmap_sem); | |
8a2ab7f5 | 354 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, |
1da177e4 LT |
355 | PROT_READ | PROT_WRITE | PROT_EXEC, |
356 | MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN, | |
357 | 0); | |
358 | ||
8a2ab7f5 | 359 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
360 | up_write(¤t->mm->mmap_sem); |
361 | retval = current->mm->start_brk; | |
362 | current->mm->start_brk = 0; | |
363 | goto error_kill; | |
364 | } | |
365 | ||
8a2ab7f5 DH |
366 | /* expand the stack mapping to use up the entire allocation granule */ |
367 | fullsize = ksize((char *) current->mm->start_brk); | |
368 | if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size, | |
369 | fullsize, 0, 0))) | |
370 | stack_size = fullsize; | |
1da177e4 LT |
371 | up_write(¤t->mm->mmap_sem); |
372 | ||
373 | current->mm->brk = current->mm->start_brk; | |
374 | current->mm->context.end_brk = current->mm->start_brk; | |
8a2ab7f5 DH |
375 | current->mm->context.end_brk += |
376 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; | |
1da177e4 LT |
377 | current->mm->start_stack = current->mm->start_brk + stack_size; |
378 | #endif | |
379 | ||
380 | compute_creds(bprm); | |
381 | current->flags &= ~PF_FORKNOEXEC; | |
8a2ab7f5 DH |
382 | if (create_elf_fdpic_tables(bprm, current->mm, |
383 | &exec_params, &interp_params) < 0) | |
1da177e4 LT |
384 | goto error_kill; |
385 | ||
8a2ab7f5 DH |
386 | kdebug("- start_code %lx", current->mm->start_code); |
387 | kdebug("- end_code %lx", current->mm->end_code); | |
388 | kdebug("- start_data %lx", current->mm->start_data); | |
389 | kdebug("- end_data %lx", current->mm->end_data); | |
390 | kdebug("- start_brk %lx", current->mm->start_brk); | |
391 | kdebug("- brk %lx", current->mm->brk); | |
392 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
393 | |
394 | #ifdef ELF_FDPIC_PLAT_INIT | |
395 | /* | |
396 | * The ABI may specify that certain registers be set up in special | |
397 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
398 | * example. This macro performs whatever initialization to | |
399 | * the regs structure is required. | |
400 | */ | |
8a2ab7f5 DH |
401 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
402 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
403 | dynaddr); | |
1da177e4 LT |
404 | #endif |
405 | ||
406 | /* everything is now ready... get the userspace context ready to roll */ | |
8a2ab7f5 DH |
407 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
408 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 LT |
409 | |
410 | if (unlikely(current->ptrace & PT_PTRACED)) { | |
411 | if (current->ptrace & PT_TRACE_EXEC) | |
8a2ab7f5 | 412 | ptrace_notify((PTRACE_EVENT_EXEC << 8) | SIGTRAP); |
1da177e4 LT |
413 | else |
414 | send_sig(SIGTRAP, current, 0); | |
415 | } | |
416 | ||
417 | retval = 0; | |
418 | ||
419 | error: | |
420 | if (interpreter) { | |
421 | allow_write_access(interpreter); | |
422 | fput(interpreter); | |
423 | } | |
f99d49ad JJ |
424 | kfree(interpreter_name); |
425 | kfree(exec_params.phdrs); | |
426 | kfree(exec_params.loadmap); | |
427 | kfree(interp_params.phdrs); | |
428 | kfree(interp_params.loadmap); | |
1da177e4 LT |
429 | return retval; |
430 | ||
431 | /* unrecoverable error - kill the process */ | |
8a2ab7f5 | 432 | error_kill: |
1da177e4 LT |
433 | send_sig(SIGSEGV, current, 0); |
434 | goto error; | |
435 | ||
8a2ab7f5 | 436 | } |
1da177e4 LT |
437 | |
438 | /*****************************************************************************/ | |
439 | /* | |
440 | * present useful information to the program | |
441 | */ | |
442 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
443 | struct mm_struct *mm, | |
444 | struct elf_fdpic_params *exec_params, | |
445 | struct elf_fdpic_params *interp_params) | |
446 | { | |
447 | unsigned long sp, csp, nitems; | |
530018bf | 448 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 449 | size_t platform_len = 0, len; |
530018bf AV |
450 | char *k_platform; |
451 | char __user *u_platform, *p; | |
1da177e4 LT |
452 | long hwcap; |
453 | int loop; | |
454 | ||
455 | /* we're going to shovel a whole load of stuff onto the stack */ | |
456 | #ifdef CONFIG_MMU | |
457 | sp = bprm->p; | |
458 | #else | |
459 | sp = mm->start_stack; | |
460 | ||
461 | /* stack the program arguments and environment */ | |
462 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) | |
463 | return -EFAULT; | |
464 | #endif | |
465 | ||
466 | /* get hold of platform and hardware capabilities masks for the machine | |
467 | * we are running on. In some cases (Sparc), this info is impossible | |
468 | * to get, in others (i386) it is merely difficult. | |
469 | */ | |
470 | hwcap = ELF_HWCAP; | |
471 | k_platform = ELF_PLATFORM; | |
1aeb21d6 | 472 | u_platform = NULL; |
1da177e4 LT |
473 | |
474 | if (k_platform) { | |
475 | platform_len = strlen(k_platform) + 1; | |
476 | sp -= platform_len; | |
530018bf | 477 | u_platform = (char __user *) sp; |
1da177e4 LT |
478 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
479 | return -EFAULT; | |
480 | } | |
481 | ||
1da177e4 LT |
482 | #if defined(__i386__) && defined(CONFIG_SMP) |
483 | /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions | |
8a2ab7f5 DH |
484 | * by the processes running on the same package. One thing we can do is |
485 | * to shuffle the initial stack for them. | |
1da177e4 | 486 | * |
8a2ab7f5 DH |
487 | * the conditionals here are unneeded, but kept in to make the code |
488 | * behaviour the same as pre change unless we have hyperthreaded | |
1da177e4 LT |
489 | * processors. This keeps Mr Marcelo Person happier but should be |
490 | * removed for 2.5 | |
491 | */ | |
492 | if (smp_num_siblings > 1) | |
493 | sp = sp - ((current->pid % 64) << 7); | |
494 | #endif | |
495 | ||
496 | sp &= ~7UL; | |
497 | ||
498 | /* stack the load map(s) */ | |
499 | len = sizeof(struct elf32_fdpic_loadmap); | |
500 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
501 | sp = (sp - len) & ~7UL; | |
502 | exec_params->map_addr = sp; | |
503 | ||
530018bf | 504 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
505 | return -EFAULT; |
506 | ||
507 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
508 | ||
509 | if (interp_params->loadmap) { | |
510 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
511 | len += sizeof(struct elf32_fdpic_loadseg) * |
512 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
513 | sp = (sp - len) & ~7UL; |
514 | interp_params->map_addr = sp; | |
515 | ||
8a2ab7f5 DH |
516 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
517 | len) != 0) | |
1da177e4 LT |
518 | return -EFAULT; |
519 | ||
520 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
521 | } | |
522 | ||
523 | /* force 16 byte _final_ alignment here for generality */ | |
524 | #define DLINFO_ITEMS 13 | |
525 | ||
526 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0); | |
527 | #ifdef DLINFO_ARCH_ITEMS | |
528 | nitems += DLINFO_ARCH_ITEMS; | |
529 | #endif | |
530 | ||
531 | csp = sp; | |
532 | sp -= nitems * 2 * sizeof(unsigned long); | |
533 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
534 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
535 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
536 | ||
537 | csp -= sp & 15UL; | |
538 | sp -= sp & 15UL; | |
539 | ||
540 | /* put the ELF interpreter info on the stack */ | |
8a2ab7f5 DH |
541 | #define NEW_AUX_ENT(nr, id, val) \ |
542 | do { \ | |
543 | struct { unsigned long _id, _val; } __user *ent; \ | |
544 | \ | |
545 | ent = (void __user *) csp; \ | |
546 | __put_user((id), &ent[nr]._id); \ | |
547 | __put_user((val), &ent[nr]._val); \ | |
1da177e4 LT |
548 | } while (0) |
549 | ||
550 | csp -= 2 * sizeof(unsigned long); | |
551 | NEW_AUX_ENT(0, AT_NULL, 0); | |
552 | if (k_platform) { | |
553 | csp -= 2 * sizeof(unsigned long); | |
8a2ab7f5 DH |
554 | NEW_AUX_ENT(0, AT_PLATFORM, |
555 | (elf_addr_t) (unsigned long) u_platform); | |
1da177e4 LT |
556 | } |
557 | ||
558 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); | |
8a2ab7f5 DH |
559 | NEW_AUX_ENT( 0, AT_HWCAP, hwcap); |
560 | NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE); | |
561 | NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC); | |
562 | NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr); | |
563 | NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr)); | |
564 | NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum); | |
565 | NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr); | |
566 | NEW_AUX_ENT( 7, AT_FLAGS, 0); | |
567 | NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr); | |
568 | NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid); | |
569 | NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid); | |
570 | NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid); | |
571 | NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid); | |
1da177e4 LT |
572 | |
573 | #ifdef ARCH_DLINFO | |
574 | /* ARCH_DLINFO must come last so platform specific code can enforce | |
575 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
576 | */ | |
577 | ARCH_DLINFO; | |
578 | #endif | |
579 | #undef NEW_AUX_ENT | |
580 | ||
581 | /* allocate room for argv[] and envv[] */ | |
582 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 583 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 584 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 585 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
586 | |
587 | /* stack argc */ | |
588 | csp -= sizeof(unsigned long); | |
530018bf | 589 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 590 | |
88bcd512 | 591 | BUG_ON(csp != sp); |
1da177e4 LT |
592 | |
593 | /* fill in the argv[] array */ | |
594 | #ifdef CONFIG_MMU | |
595 | current->mm->arg_start = bprm->p; | |
596 | #else | |
8a2ab7f5 DH |
597 | current->mm->arg_start = current->mm->start_stack - |
598 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
599 | #endif |
600 | ||
530018bf | 601 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
602 | for (loop = bprm->argc; loop > 0; loop--) { |
603 | __put_user((elf_caddr_t) p, argv++); | |
604 | len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES); | |
605 | if (!len || len > PAGE_SIZE * MAX_ARG_PAGES) | |
606 | return -EINVAL; | |
607 | p += len; | |
608 | } | |
609 | __put_user(NULL, argv); | |
610 | current->mm->arg_end = (unsigned long) p; | |
611 | ||
612 | /* fill in the envv[] array */ | |
613 | current->mm->env_start = (unsigned long) p; | |
614 | for (loop = bprm->envc; loop > 0; loop--) { | |
615 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
616 | len = strnlen_user(p, PAGE_SIZE * MAX_ARG_PAGES); | |
617 | if (!len || len > PAGE_SIZE * MAX_ARG_PAGES) | |
618 | return -EINVAL; | |
619 | p += len; | |
620 | } | |
621 | __put_user(NULL, envp); | |
622 | current->mm->env_end = (unsigned long) p; | |
623 | ||
624 | mm->start_stack = (unsigned long) sp; | |
625 | return 0; | |
8a2ab7f5 | 626 | } |
1da177e4 LT |
627 | |
628 | /*****************************************************************************/ | |
629 | /* | |
630 | * transfer the program arguments and environment from the holding pages onto | |
631 | * the stack | |
632 | */ | |
633 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
634 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
635 | unsigned long *_sp) | |
1da177e4 LT |
636 | { |
637 | unsigned long index, stop, sp; | |
638 | char *src; | |
639 | int ret = 0; | |
640 | ||
641 | stop = bprm->p >> PAGE_SHIFT; | |
642 | sp = *_sp; | |
643 | ||
644 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { | |
645 | src = kmap(bprm->page[index]); | |
646 | sp -= PAGE_SIZE; | |
647 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) | |
648 | ret = -EFAULT; | |
649 | kunmap(bprm->page[index]); | |
650 | if (ret < 0) | |
651 | goto out; | |
652 | } | |
653 | ||
654 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; | |
655 | ||
8a2ab7f5 | 656 | out: |
1da177e4 | 657 | return ret; |
8a2ab7f5 | 658 | } |
1da177e4 LT |
659 | #endif |
660 | ||
661 | /*****************************************************************************/ | |
662 | /* | |
663 | * load the appropriate binary image (executable or interpreter) into memory | |
664 | * - we assume no MMU is available | |
665 | * - if no other PIC bits are set in params->hdr->e_flags | |
666 | * - we assume that the LOADable segments in the binary are independently relocatable | |
667 | * - we assume R/O executable segments are shareable | |
668 | * - else | |
669 | * - we assume the loadable parts of the image to require fixed displacement | |
670 | * - the image is not shareable | |
671 | */ | |
672 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
673 | struct file *file, | |
674 | struct mm_struct *mm, | |
675 | const char *what) | |
676 | { | |
677 | struct elf32_fdpic_loadmap *loadmap; | |
678 | #ifdef CONFIG_MMU | |
679 | struct elf32_fdpic_loadseg *mseg; | |
680 | #endif | |
681 | struct elf32_fdpic_loadseg *seg; | |
682 | struct elf32_phdr *phdr; | |
683 | unsigned long load_addr, stop; | |
684 | unsigned nloads, tmp; | |
685 | size_t size; | |
686 | int loop, ret; | |
687 | ||
688 | /* allocate a load map table */ | |
689 | nloads = 0; | |
690 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
691 | if (params->phdrs[loop].p_type == PT_LOAD) | |
692 | nloads++; | |
693 | ||
694 | if (nloads == 0) | |
695 | return -ELIBBAD; | |
696 | ||
697 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
698 | loadmap = kmalloc(size, GFP_KERNEL); | |
699 | if (!loadmap) | |
700 | return -ENOMEM; | |
701 | ||
702 | params->loadmap = loadmap; | |
703 | memset(loadmap, 0, size); | |
704 | ||
705 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
706 | loadmap->nsegs = nloads; | |
707 | ||
708 | load_addr = params->load_addr; | |
709 | seg = loadmap->segs; | |
710 | ||
711 | /* map the requested LOADs into the memory space */ | |
712 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
713 | case ELF_FDPIC_FLAG_CONSTDISP: | |
714 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
715 | #ifndef CONFIG_MMU | |
716 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
717 | if (ret < 0) | |
718 | return ret; | |
719 | break; | |
720 | #endif | |
721 | default: | |
722 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
723 | if (ret < 0) | |
724 | return ret; | |
725 | break; | |
726 | } | |
727 | ||
728 | /* map the entry point */ | |
729 | if (params->hdr.e_entry) { | |
730 | seg = loadmap->segs; | |
731 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
732 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 733 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 734 | params->entry_addr = |
8a2ab7f5 DH |
735 | (params->hdr.e_entry - seg->p_vaddr) + |
736 | seg->addr; | |
1da177e4 LT |
737 | break; |
738 | } | |
739 | } | |
740 | } | |
741 | ||
742 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
743 | stop = params->hdr.e_phoff; |
744 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
745 | phdr = params->phdrs; |
746 | ||
747 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
748 | if (phdr->p_type != PT_LOAD) | |
749 | continue; | |
750 | ||
751 | if (phdr->p_offset > params->hdr.e_phoff || | |
752 | phdr->p_offset + phdr->p_filesz < stop) | |
753 | continue; | |
754 | ||
755 | seg = loadmap->segs; | |
756 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
757 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
758 | phdr->p_vaddr + phdr->p_filesz <= |
759 | seg->p_vaddr + seg->p_memsz) { | |
760 | params->ph_addr = | |
761 | (phdr->p_vaddr - seg->p_vaddr) + | |
762 | seg->addr + | |
1da177e4 LT |
763 | params->hdr.e_phoff - phdr->p_offset; |
764 | break; | |
765 | } | |
766 | } | |
767 | break; | |
768 | } | |
769 | ||
770 | /* determine where the dynamic section has wound up if there is one */ | |
771 | phdr = params->phdrs; | |
772 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
773 | if (phdr->p_type != PT_DYNAMIC) | |
774 | continue; | |
775 | ||
776 | seg = loadmap->segs; | |
777 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
778 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
779 | phdr->p_vaddr + phdr->p_memsz <= |
780 | seg->p_vaddr + seg->p_memsz) { | |
781 | params->dynamic_addr = | |
782 | (phdr->p_vaddr - seg->p_vaddr) + | |
783 | seg->addr; | |
784 | ||
785 | /* check the dynamic section contains at least | |
786 | * one item, and that the last item is a NULL | |
787 | * entry */ | |
1da177e4 LT |
788 | if (phdr->p_memsz == 0 || |
789 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
790 | goto dynamic_error; | |
791 | ||
792 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
8a2ab7f5 DH |
793 | if (((Elf32_Dyn *) |
794 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
1da177e4 LT |
795 | goto dynamic_error; |
796 | break; | |
797 | } | |
798 | } | |
799 | break; | |
800 | } | |
801 | ||
802 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
803 | * - on uClinux the holes between may actually be filled with system |
804 | * stuff or stuff from other processes | |
1da177e4 LT |
805 | */ |
806 | #ifdef CONFIG_MMU | |
807 | nloads = loadmap->nsegs; | |
808 | mseg = loadmap->segs; | |
809 | seg = mseg + 1; | |
810 | for (loop = 1; loop < nloads; loop++) { | |
811 | /* see if we have a candidate for merging */ | |
812 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
813 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
814 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
815 | mseg->p_memsz += |
816 | load_addr - | |
817 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
818 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
819 | mseg->p_memsz += seg->p_memsz; | |
820 | loadmap->nsegs--; | |
821 | continue; | |
822 | } | |
823 | } | |
824 | ||
825 | mseg++; | |
826 | if (mseg != seg) | |
827 | *mseg = *seg; | |
828 | } | |
829 | #endif | |
830 | ||
831 | kdebug("Mapped Object [%s]:", what); | |
832 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
833 | kdebug("- entry : %lx", params->entry_addr); | |
834 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
835 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
836 | seg = loadmap->segs; | |
837 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
838 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
839 | loop, | |
840 | seg->addr, seg->addr + seg->p_memsz - 1, | |
841 | seg->p_vaddr, seg->p_memsz); | |
842 | ||
843 | return 0; | |
844 | ||
8a2ab7f5 | 845 | dynamic_error: |
1da177e4 LT |
846 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
847 | what, file->f_dentry->d_inode->i_ino); | |
848 | return -ELIBBAD; | |
8a2ab7f5 | 849 | } |
1da177e4 LT |
850 | |
851 | /*****************************************************************************/ | |
852 | /* | |
853 | * map a file with constant displacement under uClinux | |
854 | */ | |
855 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
856 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
857 | struct elf_fdpic_params *params, | |
858 | struct file *file, | |
859 | struct mm_struct *mm) | |
1da177e4 LT |
860 | { |
861 | struct elf32_fdpic_loadseg *seg; | |
862 | struct elf32_phdr *phdr; | |
863 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
864 | loff_t fpos; | |
865 | int loop, ret; | |
866 | ||
867 | load_addr = params->load_addr; | |
868 | seg = params->loadmap->segs; | |
869 | ||
8a2ab7f5 DH |
870 | /* determine the bounds of the contiguous overall allocation we must |
871 | * make */ | |
1da177e4 LT |
872 | phdr = params->phdrs; |
873 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
874 | if (params->phdrs[loop].p_type != PT_LOAD) | |
875 | continue; | |
876 | ||
877 | if (base > phdr->p_vaddr) | |
878 | base = phdr->p_vaddr; | |
879 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
880 | top = phdr->p_vaddr + phdr->p_memsz; | |
881 | } | |
882 | ||
883 | /* allocate one big anon block for everything */ | |
884 | mflags = MAP_PRIVATE; | |
885 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
886 | mflags |= MAP_EXECUTABLE; | |
887 | ||
888 | down_write(&mm->mmap_sem); | |
889 | maddr = do_mmap(NULL, load_addr, top - base, | |
890 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); | |
891 | up_write(&mm->mmap_sem); | |
8a2ab7f5 | 892 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
893 | return (int) maddr; |
894 | ||
895 | if (load_addr != 0) | |
896 | load_addr += PAGE_ALIGN(top - base); | |
897 | ||
898 | /* and then load the file segments into it */ | |
899 | phdr = params->phdrs; | |
900 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
901 | if (params->phdrs[loop].p_type != PT_LOAD) | |
902 | continue; | |
903 | ||
904 | fpos = phdr->p_offset; | |
905 | ||
906 | seg->addr = maddr + (phdr->p_vaddr - base); | |
907 | seg->p_vaddr = phdr->p_vaddr; | |
908 | seg->p_memsz = phdr->p_memsz; | |
909 | ||
8a2ab7f5 DH |
910 | ret = file->f_op->read(file, (void *) seg->addr, |
911 | phdr->p_filesz, &fpos); | |
1da177e4 LT |
912 | if (ret < 0) |
913 | return ret; | |
914 | ||
915 | /* map the ELF header address if in this segment */ | |
916 | if (phdr->p_offset == 0) | |
917 | params->elfhdr_addr = seg->addr; | |
918 | ||
919 | /* clear any space allocated but not loaded */ | |
920 | if (phdr->p_filesz < phdr->p_memsz) | |
921 | clear_user((void *) (seg->addr + phdr->p_filesz), | |
922 | phdr->p_memsz - phdr->p_filesz); | |
923 | ||
924 | if (mm) { | |
925 | if (phdr->p_flags & PF_X) { | |
926 | mm->start_code = seg->addr; | |
927 | mm->end_code = seg->addr + phdr->p_memsz; | |
8a2ab7f5 | 928 | } else if (!mm->start_data) { |
1da177e4 LT |
929 | mm->start_data = seg->addr; |
930 | #ifndef CONFIG_MMU | |
931 | mm->end_data = seg->addr + phdr->p_memsz; | |
932 | #endif | |
933 | } | |
934 | ||
935 | #ifdef CONFIG_MMU | |
936 | if (seg->addr + phdr->p_memsz > mm->end_data) | |
937 | mm->end_data = seg->addr + phdr->p_memsz; | |
938 | #endif | |
939 | } | |
940 | ||
941 | seg++; | |
942 | } | |
943 | ||
944 | return 0; | |
8a2ab7f5 | 945 | } |
1da177e4 LT |
946 | #endif |
947 | ||
948 | /*****************************************************************************/ | |
949 | /* | |
950 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
951 | */ | |
952 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
953 | struct file *file, | |
954 | struct mm_struct *mm) | |
955 | { | |
956 | struct elf32_fdpic_loadseg *seg; | |
957 | struct elf32_phdr *phdr; | |
958 | unsigned long load_addr, delta_vaddr; | |
959 | int loop, dvset; | |
960 | ||
961 | load_addr = params->load_addr; | |
962 | delta_vaddr = 0; | |
963 | dvset = 0; | |
964 | ||
965 | seg = params->loadmap->segs; | |
966 | ||
967 | /* deal with each load segment separately */ | |
968 | phdr = params->phdrs; | |
969 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
970 | unsigned long maddr, disp, excess, excess1; | |
971 | int prot = 0, flags; | |
972 | ||
973 | if (phdr->p_type != PT_LOAD) | |
974 | continue; | |
975 | ||
976 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
977 | (unsigned long) phdr->p_vaddr, | |
978 | (unsigned long) phdr->p_offset, | |
979 | (unsigned long) phdr->p_filesz, | |
980 | (unsigned long) phdr->p_memsz); | |
981 | ||
982 | /* determine the mapping parameters */ | |
983 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
984 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
985 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
986 | ||
987 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
988 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
989 | flags |= MAP_EXECUTABLE; | |
990 | ||
991 | maddr = 0; | |
992 | ||
993 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
994 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
995 | /* PT_LOADs are independently locatable */ | |
996 | break; | |
997 | ||
998 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
999 | /* the specified virtual address must be honoured */ | |
1000 | maddr = phdr->p_vaddr; | |
1001 | flags |= MAP_FIXED; | |
1002 | break; | |
1003 | ||
1004 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1005 | /* constant displacement | |
8a2ab7f5 DH |
1006 | * - can be mapped anywhere, but must be mapped as a |
1007 | * unit | |
1da177e4 LT |
1008 | */ |
1009 | if (!dvset) { | |
1010 | maddr = load_addr; | |
1011 | delta_vaddr = phdr->p_vaddr; | |
1012 | dvset = 1; | |
8a2ab7f5 | 1013 | } else { |
1da177e4 LT |
1014 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1015 | flags |= MAP_FIXED; | |
1016 | } | |
1017 | break; | |
1018 | ||
1019 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1020 | /* contiguity handled later */ | |
1021 | break; | |
1022 | ||
1023 | default: | |
1024 | BUG(); | |
1025 | } | |
1026 | ||
1027 | maddr &= PAGE_MASK; | |
1028 | ||
1029 | /* create the mapping */ | |
1030 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
1031 | down_write(&mm->mmap_sem); | |
1032 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, | |
1033 | phdr->p_offset - disp); | |
1034 | up_write(&mm->mmap_sem); | |
1035 | ||
1036 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1037 | loop, phdr->p_memsz + disp, prot, flags, |
1038 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1039 | |
8a2ab7f5 | 1040 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1041 | return (int) maddr; |
1042 | ||
8a2ab7f5 DH |
1043 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1044 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1045 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1046 | ||
1047 | seg->addr = maddr + disp; | |
1048 | seg->p_vaddr = phdr->p_vaddr; | |
1049 | seg->p_memsz = phdr->p_memsz; | |
1050 | ||
1051 | /* map the ELF header address if in this segment */ | |
1052 | if (phdr->p_offset == 0) | |
1053 | params->elfhdr_addr = seg->addr; | |
1054 | ||
8a2ab7f5 DH |
1055 | /* clear the bit between beginning of mapping and beginning of |
1056 | * PT_LOAD */ | |
1da177e4 LT |
1057 | if (prot & PROT_WRITE && disp > 0) { |
1058 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
530018bf | 1059 | clear_user((void __user *) maddr, disp); |
1da177e4 LT |
1060 | maddr += disp; |
1061 | } | |
1062 | ||
1063 | /* clear any space allocated but not loaded | |
1064 | * - on uClinux we can just clear the lot | |
1065 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1066 | * extant in the file | |
1067 | */ | |
1068 | excess = phdr->p_memsz - phdr->p_filesz; | |
1069 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1070 | ||
1071 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1072 | if (excess > excess1) { |
1073 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1074 | unsigned long xmaddr; | |
1075 | ||
1076 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
1077 | down_write(&mm->mmap_sem); | |
8a2ab7f5 DH |
1078 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1079 | prot, flags, 0); | |
1da177e4 LT |
1080 | up_write(&mm->mmap_sem); |
1081 | ||
1082 | kdebug("mmap[%d] <anon>" | |
1083 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1084 | loop, xaddr, excess - excess1, prot, flags, |
1085 | xmaddr); | |
1da177e4 LT |
1086 | |
1087 | if (xmaddr != xaddr) | |
1088 | return -ENOMEM; | |
1089 | } | |
1090 | ||
1091 | if (prot & PROT_WRITE && excess1 > 0) { | |
1092 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1093 | loop, maddr + phdr->p_filesz, excess1); | |
8a2ab7f5 DH |
1094 | clear_user((void __user *) maddr + phdr->p_filesz, |
1095 | excess1); | |
1da177e4 LT |
1096 | } |
1097 | ||
1098 | #else | |
1099 | if (excess > 0) { | |
1100 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1101 | loop, maddr + phdr->p_filesz, excess); | |
1102 | clear_user((void *) maddr + phdr->p_filesz, excess); | |
1103 | } | |
1104 | #endif | |
1105 | ||
1106 | if (mm) { | |
1107 | if (phdr->p_flags & PF_X) { | |
1108 | mm->start_code = maddr; | |
1109 | mm->end_code = maddr + phdr->p_memsz; | |
8a2ab7f5 | 1110 | } else if (!mm->start_data) { |
1da177e4 LT |
1111 | mm->start_data = maddr; |
1112 | mm->end_data = maddr + phdr->p_memsz; | |
1113 | } | |
1114 | } | |
1115 | ||
1116 | seg++; | |
1117 | } | |
1118 | ||
1119 | return 0; | |
8a2ab7f5 | 1120 | } |