]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * arch/s390/kernel/ptrace.c | |
3 | * | |
4 | * S390 version | |
5 | * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation | |
6 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), | |
7 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
8 | * | |
9 | * Based on PowerPC version | |
10 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
11 | * | |
12 | * Derived from "arch/m68k/kernel/ptrace.c" | |
13 | * Copyright (C) 1994 by Hamish Macdonald | |
14 | * Taken from linux/kernel/ptrace.c and modified for M680x0. | |
15 | * linux/kernel/ptrace.c is by Ross Biro 1/23/92, edited by Linus Torvalds | |
16 | * | |
17 | * Modified by Cort Dougan (cort@cs.nmt.edu) | |
18 | * | |
19 | * | |
20 | * This file is subject to the terms and conditions of the GNU General | |
21 | * Public License. See the file README.legal in the main directory of | |
22 | * this archive for more details. | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
26 | #include <linux/sched.h> | |
27 | #include <linux/mm.h> | |
28 | #include <linux/smp.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/ptrace.h> | |
32 | #include <linux/user.h> | |
33 | #include <linux/security.h> | |
34 | #include <linux/audit.h> | |
7ed20e1a | 35 | #include <linux/signal.h> |
1da177e4 LT |
36 | |
37 | #include <asm/segment.h> | |
38 | #include <asm/page.h> | |
39 | #include <asm/pgtable.h> | |
40 | #include <asm/pgalloc.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/uaccess.h> | |
43 | ||
44 | #ifdef CONFIG_S390_SUPPORT | |
45 | #include "compat_ptrace.h" | |
46 | #endif | |
47 | ||
48 | static void | |
49 | FixPerRegisters(struct task_struct *task) | |
50 | { | |
51 | struct pt_regs *regs; | |
52 | per_struct *per_info; | |
53 | ||
54 | regs = __KSTK_PTREGS(task); | |
55 | per_info = (per_struct *) &task->thread.per_info; | |
56 | per_info->control_regs.bits.em_instruction_fetch = | |
57 | per_info->single_step | per_info->instruction_fetch; | |
58 | ||
59 | if (per_info->single_step) { | |
60 | per_info->control_regs.bits.starting_addr = 0; | |
61 | #ifdef CONFIG_S390_SUPPORT | |
62 | if (test_thread_flag(TIF_31BIT)) | |
63 | per_info->control_regs.bits.ending_addr = 0x7fffffffUL; | |
64 | else | |
65 | #endif | |
66 | per_info->control_regs.bits.ending_addr = PSW_ADDR_INSN; | |
67 | } else { | |
68 | per_info->control_regs.bits.starting_addr = | |
69 | per_info->starting_addr; | |
70 | per_info->control_regs.bits.ending_addr = | |
71 | per_info->ending_addr; | |
72 | } | |
73 | /* | |
74 | * if any of the control reg tracing bits are on | |
75 | * we switch on per in the psw | |
76 | */ | |
77 | if (per_info->control_regs.words.cr[0] & PER_EM_MASK) | |
78 | regs->psw.mask |= PSW_MASK_PER; | |
79 | else | |
80 | regs->psw.mask &= ~PSW_MASK_PER; | |
81 | ||
82 | if (per_info->control_regs.bits.em_storage_alteration) | |
83 | per_info->control_regs.bits.storage_alt_space_ctl = 1; | |
84 | else | |
85 | per_info->control_regs.bits.storage_alt_space_ctl = 0; | |
86 | } | |
87 | ||
88 | void | |
89 | set_single_step(struct task_struct *task) | |
90 | { | |
91 | task->thread.per_info.single_step = 1; | |
92 | FixPerRegisters(task); | |
93 | } | |
94 | ||
95 | void | |
96 | clear_single_step(struct task_struct *task) | |
97 | { | |
98 | task->thread.per_info.single_step = 0; | |
99 | FixPerRegisters(task); | |
100 | } | |
101 | ||
102 | /* | |
103 | * Called by kernel/ptrace.c when detaching.. | |
104 | * | |
105 | * Make sure single step bits etc are not set. | |
106 | */ | |
107 | void | |
108 | ptrace_disable(struct task_struct *child) | |
109 | { | |
110 | /* make sure the single step bit is not set. */ | |
111 | clear_single_step(child); | |
112 | } | |
113 | ||
114 | #ifndef CONFIG_ARCH_S390X | |
115 | # define __ADDR_MASK 3 | |
116 | #else | |
117 | # define __ADDR_MASK 7 | |
118 | #endif | |
119 | ||
120 | /* | |
121 | * Read the word at offset addr from the user area of a process. The | |
122 | * trouble here is that the information is littered over different | |
123 | * locations. The process registers are found on the kernel stack, | |
124 | * the floating point stuff and the trace settings are stored in | |
125 | * the task structure. In addition the different structures in | |
126 | * struct user contain pad bytes that should be read as zeroes. | |
127 | * Lovely... | |
128 | */ | |
129 | static int | |
130 | peek_user(struct task_struct *child, addr_t addr, addr_t data) | |
131 | { | |
132 | struct user *dummy = NULL; | |
133 | addr_t offset, tmp; | |
134 | ||
135 | /* | |
136 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
137 | * an alignment of 4. Programmers from hell... | |
138 | */ | |
139 | if ((addr & 3) || addr > sizeof(struct user) - __ADDR_MASK) | |
140 | return -EIO; | |
141 | ||
142 | if (addr < (addr_t) &dummy->regs.acrs) { | |
143 | /* | |
144 | * psw and gprs are stored on the stack | |
145 | */ | |
146 | tmp = *(addr_t *)((addr_t) &__KSTK_PTREGS(child)->psw + addr); | |
147 | if (addr == (addr_t) &dummy->regs.psw.mask) | |
148 | /* Remove per bit from user psw. */ | |
149 | tmp &= ~PSW_MASK_PER; | |
150 | ||
151 | } else if (addr < (addr_t) &dummy->regs.orig_gpr2) { | |
152 | /* | |
153 | * access registers are stored in the thread structure | |
154 | */ | |
155 | offset = addr - (addr_t) &dummy->regs.acrs; | |
156 | tmp = *(addr_t *)((addr_t) &child->thread.acrs + offset); | |
157 | ||
158 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
159 | /* | |
160 | * orig_gpr2 is stored on the kernel stack | |
161 | */ | |
162 | tmp = (addr_t) __KSTK_PTREGS(child)->orig_gpr2; | |
163 | ||
164 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { | |
165 | /* | |
166 | * floating point regs. are stored in the thread structure | |
167 | */ | |
168 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
169 | tmp = *(addr_t *)((addr_t) &child->thread.fp_regs + offset); | |
170 | ||
171 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
172 | /* | |
173 | * per_info is found in the thread structure | |
174 | */ | |
175 | offset = addr - (addr_t) &dummy->regs.per_info; | |
176 | tmp = *(addr_t *)((addr_t) &child->thread.per_info + offset); | |
177 | ||
178 | } else | |
179 | tmp = 0; | |
180 | ||
181 | return put_user(tmp, (addr_t __user *) data); | |
182 | } | |
183 | ||
184 | /* | |
185 | * Write a word to the user area of a process at location addr. This | |
186 | * operation does have an additional problem compared to peek_user. | |
187 | * Stores to the program status word and on the floating point | |
188 | * control register needs to get checked for validity. | |
189 | */ | |
190 | static int | |
191 | poke_user(struct task_struct *child, addr_t addr, addr_t data) | |
192 | { | |
193 | struct user *dummy = NULL; | |
194 | addr_t offset; | |
195 | ||
196 | /* | |
197 | * Stupid gdb peeks/pokes the access registers in 64 bit with | |
198 | * an alignment of 4. Programmers from hell indeed... | |
199 | */ | |
200 | if ((addr & 3) || addr > sizeof(struct user) - __ADDR_MASK) | |
201 | return -EIO; | |
202 | ||
203 | if (addr < (addr_t) &dummy->regs.acrs) { | |
204 | /* | |
205 | * psw and gprs are stored on the stack | |
206 | */ | |
207 | if (addr == (addr_t) &dummy->regs.psw.mask && | |
208 | #ifdef CONFIG_S390_SUPPORT | |
209 | data != PSW_MASK_MERGE(PSW_USER32_BITS, data) && | |
210 | #endif | |
211 | data != PSW_MASK_MERGE(PSW_USER_BITS, data)) | |
212 | /* Invalid psw mask. */ | |
213 | return -EINVAL; | |
214 | #ifndef CONFIG_ARCH_S390X | |
215 | if (addr == (addr_t) &dummy->regs.psw.addr) | |
216 | /* I'd like to reject addresses without the | |
217 | high order bit but older gdb's rely on it */ | |
218 | data |= PSW_ADDR_AMODE; | |
219 | #endif | |
220 | *(addr_t *)((addr_t) &__KSTK_PTREGS(child)->psw + addr) = data; | |
221 | ||
222 | } else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) { | |
223 | /* | |
224 | * access registers are stored in the thread structure | |
225 | */ | |
226 | offset = addr - (addr_t) &dummy->regs.acrs; | |
227 | *(addr_t *)((addr_t) &child->thread.acrs + offset) = data; | |
228 | ||
229 | } else if (addr == (addr_t) &dummy->regs.orig_gpr2) { | |
230 | /* | |
231 | * orig_gpr2 is stored on the kernel stack | |
232 | */ | |
233 | __KSTK_PTREGS(child)->orig_gpr2 = data; | |
234 | ||
235 | } else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) { | |
236 | /* | |
237 | * floating point regs. are stored in the thread structure | |
238 | */ | |
239 | if (addr == (addr_t) &dummy->regs.fp_regs.fpc && | |
240 | (data & ~FPC_VALID_MASK) != 0) | |
241 | return -EINVAL; | |
242 | offset = addr - (addr_t) &dummy->regs.fp_regs; | |
243 | *(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data; | |
244 | ||
245 | } else if (addr < (addr_t) (&dummy->regs.per_info + 1)) { | |
246 | /* | |
247 | * per_info is found in the thread structure | |
248 | */ | |
249 | offset = addr - (addr_t) &dummy->regs.per_info; | |
250 | *(addr_t *)((addr_t) &child->thread.per_info + offset) = data; | |
251 | ||
252 | } | |
253 | ||
254 | FixPerRegisters(child); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static int | |
259 | do_ptrace_normal(struct task_struct *child, long request, long addr, long data) | |
260 | { | |
261 | unsigned long tmp; | |
262 | ptrace_area parea; | |
263 | int copied, ret; | |
264 | ||
265 | switch (request) { | |
266 | case PTRACE_PEEKTEXT: | |
267 | case PTRACE_PEEKDATA: | |
268 | /* Remove high order bit from address (only for 31 bit). */ | |
269 | addr &= PSW_ADDR_INSN; | |
270 | /* read word at location addr. */ | |
271 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
272 | if (copied != sizeof(tmp)) | |
273 | return -EIO; | |
274 | return put_user(tmp, (unsigned long __user *) data); | |
275 | ||
276 | case PTRACE_PEEKUSR: | |
277 | /* read the word at location addr in the USER area. */ | |
278 | return peek_user(child, addr, data); | |
279 | ||
280 | case PTRACE_POKETEXT: | |
281 | case PTRACE_POKEDATA: | |
282 | /* Remove high order bit from address (only for 31 bit). */ | |
283 | addr &= PSW_ADDR_INSN; | |
284 | /* write the word at location addr. */ | |
285 | copied = access_process_vm(child, addr, &data, sizeof(data),1); | |
286 | if (copied != sizeof(data)) | |
287 | return -EIO; | |
288 | return 0; | |
289 | ||
290 | case PTRACE_POKEUSR: | |
291 | /* write the word at location addr in the USER area */ | |
292 | return poke_user(child, addr, data); | |
293 | ||
294 | case PTRACE_PEEKUSR_AREA: | |
295 | case PTRACE_POKEUSR_AREA: | |
296 | if (copy_from_user(&parea, (void __user *) addr, | |
297 | sizeof(parea))) | |
298 | return -EFAULT; | |
299 | addr = parea.kernel_addr; | |
300 | data = parea.process_addr; | |
301 | copied = 0; | |
302 | while (copied < parea.len) { | |
303 | if (request == PTRACE_PEEKUSR_AREA) | |
304 | ret = peek_user(child, addr, data); | |
305 | else { | |
306 | addr_t tmp; | |
307 | if (get_user (tmp, (addr_t __user *) data)) | |
308 | return -EFAULT; | |
309 | ret = poke_user(child, addr, tmp); | |
310 | } | |
311 | if (ret) | |
312 | return ret; | |
313 | addr += sizeof(unsigned long); | |
314 | data += sizeof(unsigned long); | |
315 | copied += sizeof(unsigned long); | |
316 | } | |
317 | return 0; | |
318 | } | |
319 | return ptrace_request(child, request, addr, data); | |
320 | } | |
321 | ||
322 | #ifdef CONFIG_S390_SUPPORT | |
323 | /* | |
324 | * Now the fun part starts... a 31 bit program running in the | |
325 | * 31 bit emulation tracing another program. PTRACE_PEEKTEXT, | |
326 | * PTRACE_PEEKDATA, PTRACE_POKETEXT and PTRACE_POKEDATA are easy | |
327 | * to handle, the difference to the 64 bit versions of the requests | |
328 | * is that the access is done in multiples of 4 byte instead of | |
329 | * 8 bytes (sizeof(unsigned long) on 31/64 bit). | |
330 | * The ugly part are PTRACE_PEEKUSR, PTRACE_PEEKUSR_AREA, | |
331 | * PTRACE_POKEUSR and PTRACE_POKEUSR_AREA. If the traced program | |
332 | * is a 31 bit program too, the content of struct user can be | |
333 | * emulated. A 31 bit program peeking into the struct user of | |
334 | * a 64 bit program is a no-no. | |
335 | */ | |
336 | ||
337 | /* | |
338 | * Same as peek_user but for a 31 bit program. | |
339 | */ | |
340 | static int | |
341 | peek_user_emu31(struct task_struct *child, addr_t addr, addr_t data) | |
342 | { | |
343 | struct user32 *dummy32 = NULL; | |
344 | per_struct32 *dummy_per32 = NULL; | |
345 | addr_t offset; | |
346 | __u32 tmp; | |
347 | ||
348 | if (!test_thread_flag(TIF_31BIT) || | |
349 | (addr & 3) || addr > sizeof(struct user) - 3) | |
350 | return -EIO; | |
351 | ||
352 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
353 | /* | |
354 | * psw and gprs are stored on the stack | |
355 | */ | |
356 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
357 | /* Fake a 31 bit psw mask. */ | |
358 | tmp = (__u32)(__KSTK_PTREGS(child)->psw.mask >> 32); | |
359 | tmp = PSW32_MASK_MERGE(PSW32_USER_BITS, tmp); | |
360 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { | |
361 | /* Fake a 31 bit psw address. */ | |
362 | tmp = (__u32) __KSTK_PTREGS(child)->psw.addr | | |
363 | PSW32_ADDR_AMODE31; | |
364 | } else { | |
365 | /* gpr 0-15 */ | |
366 | tmp = *(__u32 *)((addr_t) &__KSTK_PTREGS(child)->psw + | |
367 | addr*2 + 4); | |
368 | } | |
369 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
370 | /* | |
371 | * access registers are stored in the thread structure | |
372 | */ | |
373 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
374 | tmp = *(__u32*)((addr_t) &child->thread.acrs + offset); | |
375 | ||
376 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
377 | /* | |
378 | * orig_gpr2 is stored on the kernel stack | |
379 | */ | |
380 | tmp = *(__u32*)((addr_t) &__KSTK_PTREGS(child)->orig_gpr2 + 4); | |
381 | ||
382 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { | |
383 | /* | |
384 | * floating point regs. are stored in the thread structure | |
385 | */ | |
386 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
387 | tmp = *(__u32 *)((addr_t) &child->thread.fp_regs + offset); | |
388 | ||
389 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
390 | /* | |
391 | * per_info is found in the thread structure | |
392 | */ | |
393 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
394 | /* This is magic. See per_struct and per_struct32. */ | |
395 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
396 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
397 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
398 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
399 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
400 | offset = offset*2 + 4; | |
401 | else | |
402 | offset = offset*2; | |
403 | tmp = *(__u32 *)((addr_t) &child->thread.per_info + offset); | |
404 | ||
405 | } else | |
406 | tmp = 0; | |
407 | ||
408 | return put_user(tmp, (__u32 __user *) data); | |
409 | } | |
410 | ||
411 | /* | |
412 | * Same as poke_user but for a 31 bit program. | |
413 | */ | |
414 | static int | |
415 | poke_user_emu31(struct task_struct *child, addr_t addr, addr_t data) | |
416 | { | |
417 | struct user32 *dummy32 = NULL; | |
418 | per_struct32 *dummy_per32 = NULL; | |
419 | addr_t offset; | |
420 | __u32 tmp; | |
421 | ||
422 | if (!test_thread_flag(TIF_31BIT) || | |
423 | (addr & 3) || addr > sizeof(struct user32) - 3) | |
424 | return -EIO; | |
425 | ||
426 | tmp = (__u32) data; | |
427 | ||
428 | if (addr < (addr_t) &dummy32->regs.acrs) { | |
429 | /* | |
430 | * psw, gprs, acrs and orig_gpr2 are stored on the stack | |
431 | */ | |
432 | if (addr == (addr_t) &dummy32->regs.psw.mask) { | |
433 | /* Build a 64 bit psw mask from 31 bit mask. */ | |
434 | if (tmp != PSW32_MASK_MERGE(PSW32_USER_BITS, tmp)) | |
435 | /* Invalid psw mask. */ | |
436 | return -EINVAL; | |
437 | __KSTK_PTREGS(child)->psw.mask = | |
438 | PSW_MASK_MERGE(PSW_USER32_BITS, (__u64) tmp << 32); | |
439 | } else if (addr == (addr_t) &dummy32->regs.psw.addr) { | |
440 | /* Build a 64 bit psw address from 31 bit address. */ | |
441 | __KSTK_PTREGS(child)->psw.addr = | |
442 | (__u64) tmp & PSW32_ADDR_INSN; | |
443 | } else { | |
444 | /* gpr 0-15 */ | |
445 | *(__u32*)((addr_t) &__KSTK_PTREGS(child)->psw | |
446 | + addr*2 + 4) = tmp; | |
447 | } | |
448 | } else if (addr < (addr_t) (&dummy32->regs.orig_gpr2)) { | |
449 | /* | |
450 | * access registers are stored in the thread structure | |
451 | */ | |
452 | offset = addr - (addr_t) &dummy32->regs.acrs; | |
453 | *(__u32*)((addr_t) &child->thread.acrs + offset) = tmp; | |
454 | ||
455 | } else if (addr == (addr_t) (&dummy32->regs.orig_gpr2)) { | |
456 | /* | |
457 | * orig_gpr2 is stored on the kernel stack | |
458 | */ | |
459 | *(__u32*)((addr_t) &__KSTK_PTREGS(child)->orig_gpr2 + 4) = tmp; | |
460 | ||
461 | } else if (addr < (addr_t) (&dummy32->regs.fp_regs + 1)) { | |
462 | /* | |
463 | * floating point regs. are stored in the thread structure | |
464 | */ | |
465 | if (addr == (addr_t) &dummy32->regs.fp_regs.fpc && | |
466 | (tmp & ~FPC_VALID_MASK) != 0) | |
467 | /* Invalid floating point control. */ | |
468 | return -EINVAL; | |
469 | offset = addr - (addr_t) &dummy32->regs.fp_regs; | |
470 | *(__u32 *)((addr_t) &child->thread.fp_regs + offset) = tmp; | |
471 | ||
472 | } else if (addr < (addr_t) (&dummy32->regs.per_info + 1)) { | |
473 | /* | |
474 | * per_info is found in the thread structure. | |
475 | */ | |
476 | offset = addr - (addr_t) &dummy32->regs.per_info; | |
477 | /* | |
478 | * This is magic. See per_struct and per_struct32. | |
479 | * By incident the offsets in per_struct are exactly | |
480 | * twice the offsets in per_struct32 for all fields. | |
481 | * The 8 byte fields need special handling though, | |
482 | * because the second half (bytes 4-7) is needed and | |
483 | * not the first half. | |
484 | */ | |
485 | if ((offset >= (addr_t) &dummy_per32->control_regs && | |
486 | offset < (addr_t) (&dummy_per32->control_regs + 1)) || | |
487 | (offset >= (addr_t) &dummy_per32->starting_addr && | |
488 | offset <= (addr_t) &dummy_per32->ending_addr) || | |
489 | offset == (addr_t) &dummy_per32->lowcore.words.address) | |
490 | offset = offset*2 + 4; | |
491 | else | |
492 | offset = offset*2; | |
493 | *(__u32 *)((addr_t) &child->thread.per_info + offset) = tmp; | |
494 | ||
495 | } | |
496 | ||
497 | FixPerRegisters(child); | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static int | |
502 | do_ptrace_emu31(struct task_struct *child, long request, long addr, long data) | |
503 | { | |
504 | unsigned int tmp; /* 4 bytes !! */ | |
505 | ptrace_area_emu31 parea; | |
506 | int copied, ret; | |
507 | ||
508 | switch (request) { | |
509 | case PTRACE_PEEKTEXT: | |
510 | case PTRACE_PEEKDATA: | |
511 | /* read word at location addr. */ | |
512 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); | |
513 | if (copied != sizeof(tmp)) | |
514 | return -EIO; | |
515 | return put_user(tmp, (unsigned int __user *) data); | |
516 | ||
517 | case PTRACE_PEEKUSR: | |
518 | /* read the word at location addr in the USER area. */ | |
519 | return peek_user_emu31(child, addr, data); | |
520 | ||
521 | case PTRACE_POKETEXT: | |
522 | case PTRACE_POKEDATA: | |
523 | /* write the word at location addr. */ | |
524 | tmp = data; | |
525 | copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 1); | |
526 | if (copied != sizeof(tmp)) | |
527 | return -EIO; | |
528 | return 0; | |
529 | ||
530 | case PTRACE_POKEUSR: | |
531 | /* write the word at location addr in the USER area */ | |
532 | return poke_user_emu31(child, addr, data); | |
533 | ||
534 | case PTRACE_PEEKUSR_AREA: | |
535 | case PTRACE_POKEUSR_AREA: | |
536 | if (copy_from_user(&parea, (void __user *) addr, | |
537 | sizeof(parea))) | |
538 | return -EFAULT; | |
539 | addr = parea.kernel_addr; | |
540 | data = parea.process_addr; | |
541 | copied = 0; | |
542 | while (copied < parea.len) { | |
543 | if (request == PTRACE_PEEKUSR_AREA) | |
544 | ret = peek_user_emu31(child, addr, data); | |
545 | else { | |
546 | __u32 tmp; | |
547 | if (get_user (tmp, (__u32 __user *) data)) | |
548 | return -EFAULT; | |
549 | ret = poke_user_emu31(child, addr, tmp); | |
550 | } | |
551 | if (ret) | |
552 | return ret; | |
553 | addr += sizeof(unsigned int); | |
554 | data += sizeof(unsigned int); | |
555 | copied += sizeof(unsigned int); | |
556 | } | |
557 | return 0; | |
558 | case PTRACE_GETEVENTMSG: | |
559 | return put_user((__u32) child->ptrace_message, | |
560 | (unsigned int __user *) data); | |
561 | case PTRACE_GETSIGINFO: | |
562 | if (child->last_siginfo == NULL) | |
563 | return -EINVAL; | |
564 | return copy_siginfo_to_user32((compat_siginfo_t __user *) data, | |
565 | child->last_siginfo); | |
566 | case PTRACE_SETSIGINFO: | |
567 | if (child->last_siginfo == NULL) | |
568 | return -EINVAL; | |
569 | return copy_siginfo_from_user32(child->last_siginfo, | |
570 | (compat_siginfo_t __user *) data); | |
571 | } | |
572 | return ptrace_request(child, request, addr, data); | |
573 | } | |
574 | #endif | |
575 | ||
576 | #define PT32_IEEE_IP 0x13c | |
577 | ||
578 | static int | |
579 | do_ptrace(struct task_struct *child, long request, long addr, long data) | |
580 | { | |
581 | int ret; | |
582 | ||
583 | if (request == PTRACE_ATTACH) | |
584 | return ptrace_attach(child); | |
585 | ||
586 | /* | |
587 | * Special cases to get/store the ieee instructions pointer. | |
588 | */ | |
589 | if (child == current) { | |
590 | if (request == PTRACE_PEEKUSR && addr == PT_IEEE_IP) | |
591 | return peek_user(child, addr, data); | |
592 | if (request == PTRACE_POKEUSR && addr == PT_IEEE_IP) | |
593 | return poke_user(child, addr, data); | |
594 | #ifdef CONFIG_S390_SUPPORT | |
595 | if (request == PTRACE_PEEKUSR && | |
596 | addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT)) | |
597 | return peek_user_emu31(child, addr, data); | |
598 | if (request == PTRACE_POKEUSR && | |
599 | addr == PT32_IEEE_IP && test_thread_flag(TIF_31BIT)) | |
600 | return poke_user_emu31(child, addr, data); | |
601 | #endif | |
602 | } | |
603 | ||
604 | ret = ptrace_check_attach(child, request == PTRACE_KILL); | |
605 | if (ret < 0) | |
606 | return ret; | |
607 | ||
608 | switch (request) { | |
609 | case PTRACE_SYSCALL: | |
610 | /* continue and stop at next (return from) syscall */ | |
611 | case PTRACE_CONT: | |
612 | /* restart after signal. */ | |
7ed20e1a | 613 | if (!valid_signal(data)) |
1da177e4 LT |
614 | return -EIO; |
615 | if (request == PTRACE_SYSCALL) | |
616 | set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
617 | else | |
618 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
619 | child->exit_code = data; | |
620 | /* make sure the single step bit is not set. */ | |
621 | clear_single_step(child); | |
622 | wake_up_process(child); | |
623 | return 0; | |
624 | ||
625 | case PTRACE_KILL: | |
626 | /* | |
627 | * make the child exit. Best I can do is send it a sigkill. | |
628 | * perhaps it should be put in the status that it wants to | |
629 | * exit. | |
630 | */ | |
631 | if (child->exit_state == EXIT_ZOMBIE) /* already dead */ | |
632 | return 0; | |
633 | child->exit_code = SIGKILL; | |
634 | /* make sure the single step bit is not set. */ | |
635 | clear_single_step(child); | |
636 | wake_up_process(child); | |
637 | return 0; | |
638 | ||
639 | case PTRACE_SINGLESTEP: | |
640 | /* set the trap flag. */ | |
7ed20e1a | 641 | if (!valid_signal(data)) |
1da177e4 LT |
642 | return -EIO; |
643 | clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); | |
644 | child->exit_code = data; | |
645 | if (data) | |
646 | set_tsk_thread_flag(child, TIF_SINGLE_STEP); | |
647 | else | |
648 | set_single_step(child); | |
649 | /* give it a chance to run. */ | |
650 | wake_up_process(child); | |
651 | return 0; | |
652 | ||
653 | case PTRACE_DETACH: | |
654 | /* detach a process that was attached. */ | |
655 | return ptrace_detach(child, data); | |
656 | ||
657 | ||
658 | /* Do requests that differ for 31/64 bit */ | |
659 | default: | |
660 | #ifdef CONFIG_S390_SUPPORT | |
661 | if (test_thread_flag(TIF_31BIT)) | |
662 | return do_ptrace_emu31(child, request, addr, data); | |
663 | #endif | |
664 | return do_ptrace_normal(child, request, addr, data); | |
665 | } | |
666 | /* Not reached. */ | |
667 | return -EIO; | |
668 | } | |
669 | ||
670 | asmlinkage long | |
671 | sys_ptrace(long request, long pid, long addr, long data) | |
672 | { | |
673 | struct task_struct *child; | |
674 | int ret; | |
675 | ||
676 | lock_kernel(); | |
677 | ||
678 | if (request == PTRACE_TRACEME) { | |
679 | /* are we already being traced? */ | |
680 | ret = -EPERM; | |
681 | if (current->ptrace & PT_PTRACED) | |
682 | goto out; | |
683 | ret = security_ptrace(current->parent, current); | |
684 | if (ret) | |
685 | goto out; | |
686 | /* set the ptrace bit in the process flags. */ | |
687 | current->ptrace |= PT_PTRACED; | |
688 | goto out; | |
689 | } | |
690 | ||
691 | ret = -EPERM; | |
692 | if (pid == 1) /* you may not mess with init */ | |
693 | goto out; | |
694 | ||
695 | ret = -ESRCH; | |
696 | read_lock(&tasklist_lock); | |
697 | child = find_task_by_pid(pid); | |
698 | if (child) | |
699 | get_task_struct(child); | |
700 | read_unlock(&tasklist_lock); | |
701 | if (!child) | |
702 | goto out; | |
703 | ||
704 | ret = do_ptrace(child, request, addr, data); | |
705 | ||
706 | put_task_struct(child); | |
707 | out: | |
708 | unlock_kernel(); | |
709 | return ret; | |
710 | } | |
711 | ||
712 | asmlinkage void | |
713 | syscall_trace(struct pt_regs *regs, int entryexit) | |
714 | { | |
2fd6f58b DW |
715 | if (unlikely(current->audit_context) && entryexit) |
716 | audit_syscall_exit(current, AUDITSC_RESULT(regs->gprs[2]), regs->gprs[2]); | |
717 | ||
1da177e4 | 718 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
2fd6f58b | 719 | goto out; |
1da177e4 | 720 | if (!(current->ptrace & PT_PTRACED)) |
2fd6f58b | 721 | goto out; |
1da177e4 LT |
722 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) |
723 | ? 0x80 : 0)); | |
724 | ||
725 | /* | |
726 | * this isn't the same as continuing with a signal, but it will do | |
727 | * for normal use. strace only continues with a signal if the | |
728 | * stopping signal is not SIGTRAP. -brl | |
729 | */ | |
730 | if (current->exit_code) { | |
731 | send_sig(current->exit_code, current, 1); | |
732 | current->exit_code = 0; | |
733 | } | |
2fd6f58b DW |
734 | out: |
735 | if (unlikely(current->audit_context) && !entryexit) | |
736 | audit_syscall_entry(current, | |
737 | test_thread_flag(TIF_31BIT)?AUDIT_ARCH_S390:AUDIT_ARCH_S390X, | |
738 | regs->gprs[2], regs->orig_gpr2, regs->gprs[3], | |
739 | regs->gprs[4], regs->gprs[5]); | |
1da177e4 | 740 | } |