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Commit | Line | Data |
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1da177e4 LT |
1 | /* By Ross Biro 1/23/92 */ |
2 | /* | |
3 | * Pentium III FXSR, SSE support | |
4 | * Gareth Hughes <gareth@valinux.com>, May 2000 | |
eee3af4a MM |
5 | * |
6 | * BTS tracing | |
7 | * Markus Metzger <markus.t.metzger@intel.com>, Dec 2007 | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/smp.h> | |
1da177e4 LT |
14 | #include <linux/errno.h> |
15 | #include <linux/ptrace.h> | |
91e7b707 | 16 | #include <linux/regset.h> |
eeea3c3f | 17 | #include <linux/tracehook.h> |
1da177e4 | 18 | #include <linux/user.h> |
070459d9 | 19 | #include <linux/elf.h> |
1da177e4 LT |
20 | #include <linux/security.h> |
21 | #include <linux/audit.h> | |
22 | #include <linux/seccomp.h> | |
7ed20e1a | 23 | #include <linux/signal.h> |
e2b371f0 | 24 | #include <linux/workqueue.h> |
1da177e4 LT |
25 | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/pgtable.h> | |
28 | #include <asm/system.h> | |
29 | #include <asm/processor.h> | |
30 | #include <asm/i387.h> | |
31 | #include <asm/debugreg.h> | |
32 | #include <asm/ldt.h> | |
33 | #include <asm/desc.h> | |
2047b08b RM |
34 | #include <asm/prctl.h> |
35 | #include <asm/proto.h> | |
eee3af4a MM |
36 | #include <asm/ds.h> |
37 | ||
47788c58 FW |
38 | #include <trace/syscall.h> |
39 | ||
070459d9 RM |
40 | #include "tls.h" |
41 | ||
42 | enum x86_regset { | |
43 | REGSET_GENERAL, | |
44 | REGSET_FP, | |
45 | REGSET_XFP, | |
325af5fb | 46 | REGSET_IOPERM64 = REGSET_XFP, |
070459d9 | 47 | REGSET_TLS, |
325af5fb | 48 | REGSET_IOPERM32, |
070459d9 | 49 | }; |
eee3af4a | 50 | |
1da177e4 LT |
51 | /* |
52 | * does not yet catch signals sent when the child dies. | |
53 | * in exit.c or in signal.c. | |
54 | */ | |
55 | ||
9f155b98 CE |
56 | /* |
57 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 58 | */ |
e39c2891 RM |
59 | #define FLAG_MASK_32 ((unsigned long) \ |
60 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
61 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
62 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
63 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
64 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
65 | ||
2047b08b RM |
66 | /* |
67 | * Determines whether a value may be installed in a segment register. | |
68 | */ | |
69 | static inline bool invalid_selector(u16 value) | |
70 | { | |
71 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
72 | } | |
73 | ||
74 | #ifdef CONFIG_X86_32 | |
75 | ||
e39c2891 | 76 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 77 | |
4fe702c7 | 78 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 79 | { |
65ea5b03 | 80 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 81 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
82 | } |
83 | ||
06ee1b68 | 84 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 85 | { |
06ee1b68 RM |
86 | /* |
87 | * Returning the value truncates it to 16 bits. | |
88 | */ | |
89 | unsigned int retval; | |
90 | if (offset != offsetof(struct user_regs_struct, gs)) | |
91 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
92 | else { | |
06ee1b68 | 93 | if (task == current) |
d9a89a26 TH |
94 | retval = get_user_gs(task_pt_regs(task)); |
95 | else | |
96 | retval = task_user_gs(task); | |
06ee1b68 RM |
97 | } |
98 | return retval; | |
99 | } | |
100 | ||
101 | static int set_segment_reg(struct task_struct *task, | |
102 | unsigned long offset, u16 value) | |
103 | { | |
104 | /* | |
105 | * The value argument was already truncated to 16 bits. | |
106 | */ | |
2047b08b | 107 | if (invalid_selector(value)) |
06ee1b68 RM |
108 | return -EIO; |
109 | ||
c63855d0 RM |
110 | /* |
111 | * For %cs and %ss we cannot permit a null selector. | |
112 | * We can permit a bogus selector as long as it has USER_RPL. | |
113 | * Null selectors are fine for other segment registers, but | |
114 | * we will never get back to user mode with invalid %cs or %ss | |
115 | * and will take the trap in iret instead. Much code relies | |
116 | * on user_mode() to distinguish a user trap frame (which can | |
117 | * safely use invalid selectors) from a kernel trap frame. | |
118 | */ | |
119 | switch (offset) { | |
120 | case offsetof(struct user_regs_struct, cs): | |
121 | case offsetof(struct user_regs_struct, ss): | |
122 | if (unlikely(value == 0)) | |
123 | return -EIO; | |
124 | ||
125 | default: | |
06ee1b68 | 126 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
127 | break; |
128 | ||
129 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 130 | if (task == current) |
d9a89a26 TH |
131 | set_user_gs(task_pt_regs(task), value); |
132 | else | |
133 | task_user_gs(task) = value; | |
1da177e4 | 134 | } |
06ee1b68 | 135 | |
1da177e4 LT |
136 | return 0; |
137 | } | |
138 | ||
2047b08b RM |
139 | static unsigned long debugreg_addr_limit(struct task_struct *task) |
140 | { | |
141 | return TASK_SIZE - 3; | |
142 | } | |
143 | ||
144 | #else /* CONFIG_X86_64 */ | |
145 | ||
146 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
147 | ||
148 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
149 | { | |
150 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
151 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
152 | } | |
153 | ||
154 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
155 | { | |
156 | /* | |
157 | * Returning the value truncates it to 16 bits. | |
158 | */ | |
159 | unsigned int seg; | |
160 | ||
161 | switch (offset) { | |
162 | case offsetof(struct user_regs_struct, fs): | |
163 | if (task == current) { | |
164 | /* Older gas can't assemble movq %?s,%r?? */ | |
165 | asm("movl %%fs,%0" : "=r" (seg)); | |
166 | return seg; | |
167 | } | |
168 | return task->thread.fsindex; | |
169 | case offsetof(struct user_regs_struct, gs): | |
170 | if (task == current) { | |
171 | asm("movl %%gs,%0" : "=r" (seg)); | |
172 | return seg; | |
173 | } | |
174 | return task->thread.gsindex; | |
175 | case offsetof(struct user_regs_struct, ds): | |
176 | if (task == current) { | |
177 | asm("movl %%ds,%0" : "=r" (seg)); | |
178 | return seg; | |
179 | } | |
180 | return task->thread.ds; | |
181 | case offsetof(struct user_regs_struct, es): | |
182 | if (task == current) { | |
183 | asm("movl %%es,%0" : "=r" (seg)); | |
184 | return seg; | |
185 | } | |
186 | return task->thread.es; | |
187 | ||
188 | case offsetof(struct user_regs_struct, cs): | |
189 | case offsetof(struct user_regs_struct, ss): | |
190 | break; | |
191 | } | |
192 | return *pt_regs_access(task_pt_regs(task), offset); | |
193 | } | |
194 | ||
195 | static int set_segment_reg(struct task_struct *task, | |
196 | unsigned long offset, u16 value) | |
197 | { | |
198 | /* | |
199 | * The value argument was already truncated to 16 bits. | |
200 | */ | |
201 | if (invalid_selector(value)) | |
202 | return -EIO; | |
203 | ||
204 | switch (offset) { | |
205 | case offsetof(struct user_regs_struct,fs): | |
206 | /* | |
207 | * If this is setting fs as for normal 64-bit use but | |
208 | * setting fs_base has implicitly changed it, leave it. | |
209 | */ | |
210 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
211 | task->thread.fs != 0) || | |
212 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
213 | task->thread.fs == 0)) | |
214 | break; | |
215 | task->thread.fsindex = value; | |
216 | if (task == current) | |
217 | loadsegment(fs, task->thread.fsindex); | |
218 | break; | |
219 | case offsetof(struct user_regs_struct,gs): | |
220 | /* | |
221 | * If this is setting gs as for normal 64-bit use but | |
222 | * setting gs_base has implicitly changed it, leave it. | |
223 | */ | |
224 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
225 | task->thread.gs != 0) || | |
226 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
227 | task->thread.gs == 0)) | |
228 | break; | |
229 | task->thread.gsindex = value; | |
230 | if (task == current) | |
231 | load_gs_index(task->thread.gsindex); | |
232 | break; | |
233 | case offsetof(struct user_regs_struct,ds): | |
234 | task->thread.ds = value; | |
235 | if (task == current) | |
236 | loadsegment(ds, task->thread.ds); | |
237 | break; | |
238 | case offsetof(struct user_regs_struct,es): | |
239 | task->thread.es = value; | |
240 | if (task == current) | |
241 | loadsegment(es, task->thread.es); | |
242 | break; | |
243 | ||
244 | /* | |
245 | * Can't actually change these in 64-bit mode. | |
246 | */ | |
247 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
248 | if (unlikely(value == 0)) |
249 | return -EIO; | |
2047b08b RM |
250 | #ifdef CONFIG_IA32_EMULATION |
251 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
252 | task_pt_regs(task)->cs = value; | |
2047b08b | 253 | #endif |
cb757c41 | 254 | break; |
2047b08b | 255 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
256 | if (unlikely(value == 0)) |
257 | return -EIO; | |
2047b08b RM |
258 | #ifdef CONFIG_IA32_EMULATION |
259 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
260 | task_pt_regs(task)->ss = value; | |
2047b08b | 261 | #endif |
cb757c41 | 262 | break; |
2047b08b RM |
263 | } |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
268 | static unsigned long debugreg_addr_limit(struct task_struct *task) | |
269 | { | |
270 | #ifdef CONFIG_IA32_EMULATION | |
271 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
272 | return IA32_PAGE_OFFSET - 3; | |
273 | #endif | |
d9517346 | 274 | return TASK_SIZE_MAX - 7; |
2047b08b RM |
275 | } |
276 | ||
277 | #endif /* CONFIG_X86_32 */ | |
278 | ||
06ee1b68 | 279 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 280 | { |
06ee1b68 RM |
281 | unsigned long retval = task_pt_regs(task)->flags; |
282 | ||
283 | /* | |
284 | * If the debugger set TF, hide it from the readout. | |
285 | */ | |
286 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
287 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 288 | |
1da177e4 LT |
289 | return retval; |
290 | } | |
291 | ||
06ee1b68 RM |
292 | static int set_flags(struct task_struct *task, unsigned long value) |
293 | { | |
294 | struct pt_regs *regs = task_pt_regs(task); | |
295 | ||
296 | /* | |
297 | * If the user value contains TF, mark that | |
298 | * it was not "us" (the debugger) that set it. | |
299 | * If not, make sure it stays set if we had. | |
300 | */ | |
301 | if (value & X86_EFLAGS_TF) | |
302 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
303 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
304 | value |= X86_EFLAGS_TF; | |
305 | ||
306 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | static int putreg(struct task_struct *child, | |
312 | unsigned long offset, unsigned long value) | |
313 | { | |
314 | switch (offset) { | |
315 | case offsetof(struct user_regs_struct, cs): | |
316 | case offsetof(struct user_regs_struct, ds): | |
317 | case offsetof(struct user_regs_struct, es): | |
318 | case offsetof(struct user_regs_struct, fs): | |
319 | case offsetof(struct user_regs_struct, gs): | |
320 | case offsetof(struct user_regs_struct, ss): | |
321 | return set_segment_reg(child, offset, value); | |
322 | ||
323 | case offsetof(struct user_regs_struct, flags): | |
324 | return set_flags(child, value); | |
2047b08b RM |
325 | |
326 | #ifdef CONFIG_X86_64 | |
84c6f604 RM |
327 | /* |
328 | * Orig_ax is really just a flag with small positive and | |
329 | * negative values, so make sure to always sign-extend it | |
330 | * from 32 bits so that it works correctly regardless of | |
331 | * whether we come from a 32-bit environment or not. | |
332 | */ | |
333 | case offsetof(struct user_regs_struct, orig_ax): | |
334 | value = (long) (s32) value; | |
335 | break; | |
336 | ||
2047b08b RM |
337 | case offsetof(struct user_regs_struct,fs_base): |
338 | if (value >= TASK_SIZE_OF(child)) | |
339 | return -EIO; | |
340 | /* | |
341 | * When changing the segment base, use do_arch_prctl | |
342 | * to set either thread.fs or thread.fsindex and the | |
343 | * corresponding GDT slot. | |
344 | */ | |
345 | if (child->thread.fs != value) | |
346 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
347 | return 0; | |
348 | case offsetof(struct user_regs_struct,gs_base): | |
349 | /* | |
350 | * Exactly the same here as the %fs handling above. | |
351 | */ | |
352 | if (value >= TASK_SIZE_OF(child)) | |
353 | return -EIO; | |
354 | if (child->thread.gs != value) | |
355 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
356 | return 0; | |
357 | #endif | |
06ee1b68 RM |
358 | } |
359 | ||
360 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
365 | { | |
366 | switch (offset) { | |
367 | case offsetof(struct user_regs_struct, cs): | |
368 | case offsetof(struct user_regs_struct, ds): | |
369 | case offsetof(struct user_regs_struct, es): | |
370 | case offsetof(struct user_regs_struct, fs): | |
371 | case offsetof(struct user_regs_struct, gs): | |
372 | case offsetof(struct user_regs_struct, ss): | |
373 | return get_segment_reg(task, offset); | |
374 | ||
375 | case offsetof(struct user_regs_struct, flags): | |
376 | return get_flags(task); | |
2047b08b RM |
377 | |
378 | #ifdef CONFIG_X86_64 | |
379 | case offsetof(struct user_regs_struct, fs_base): { | |
380 | /* | |
381 | * do_arch_prctl may have used a GDT slot instead of | |
382 | * the MSR. To userland, it appears the same either | |
383 | * way, except the %fs segment selector might not be 0. | |
384 | */ | |
385 | unsigned int seg = task->thread.fsindex; | |
386 | if (task->thread.fs != 0) | |
387 | return task->thread.fs; | |
388 | if (task == current) | |
389 | asm("movl %%fs,%0" : "=r" (seg)); | |
390 | if (seg != FS_TLS_SEL) | |
391 | return 0; | |
392 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
393 | } | |
394 | case offsetof(struct user_regs_struct, gs_base): { | |
395 | /* | |
396 | * Exactly the same here as the %fs handling above. | |
397 | */ | |
398 | unsigned int seg = task->thread.gsindex; | |
399 | if (task->thread.gs != 0) | |
400 | return task->thread.gs; | |
401 | if (task == current) | |
402 | asm("movl %%gs,%0" : "=r" (seg)); | |
403 | if (seg != GS_TLS_SEL) | |
404 | return 0; | |
405 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
406 | } | |
407 | #endif | |
06ee1b68 RM |
408 | } |
409 | ||
410 | return *pt_regs_access(task_pt_regs(task), offset); | |
411 | } | |
412 | ||
91e7b707 RM |
413 | static int genregs_get(struct task_struct *target, |
414 | const struct user_regset *regset, | |
415 | unsigned int pos, unsigned int count, | |
416 | void *kbuf, void __user *ubuf) | |
417 | { | |
418 | if (kbuf) { | |
419 | unsigned long *k = kbuf; | |
420 | while (count > 0) { | |
421 | *k++ = getreg(target, pos); | |
422 | count -= sizeof(*k); | |
423 | pos += sizeof(*k); | |
424 | } | |
425 | } else { | |
426 | unsigned long __user *u = ubuf; | |
427 | while (count > 0) { | |
428 | if (__put_user(getreg(target, pos), u++)) | |
429 | return -EFAULT; | |
430 | count -= sizeof(*u); | |
431 | pos += sizeof(*u); | |
432 | } | |
433 | } | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | static int genregs_set(struct task_struct *target, | |
439 | const struct user_regset *regset, | |
440 | unsigned int pos, unsigned int count, | |
441 | const void *kbuf, const void __user *ubuf) | |
442 | { | |
443 | int ret = 0; | |
444 | if (kbuf) { | |
445 | const unsigned long *k = kbuf; | |
446 | while (count > 0 && !ret) { | |
447 | ret = putreg(target, pos, *k++); | |
448 | count -= sizeof(*k); | |
449 | pos += sizeof(*k); | |
450 | } | |
451 | } else { | |
452 | const unsigned long __user *u = ubuf; | |
453 | while (count > 0 && !ret) { | |
454 | unsigned long word; | |
455 | ret = __get_user(word, u++); | |
456 | if (ret) | |
457 | break; | |
458 | ret = putreg(target, pos, word); | |
459 | count -= sizeof(*u); | |
460 | pos += sizeof(*u); | |
461 | } | |
462 | } | |
463 | return ret; | |
464 | } | |
465 | ||
d9771e8c RM |
466 | /* |
467 | * This function is trivial and will be inlined by the compiler. | |
468 | * Having it separates the implementation details of debug | |
469 | * registers from the interface details of ptrace. | |
470 | */ | |
471 | static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) | |
472 | { | |
0f534093 RM |
473 | switch (n) { |
474 | case 0: return child->thread.debugreg0; | |
475 | case 1: return child->thread.debugreg1; | |
476 | case 2: return child->thread.debugreg2; | |
477 | case 3: return child->thread.debugreg3; | |
478 | case 6: return child->thread.debugreg6; | |
479 | case 7: return child->thread.debugreg7; | |
480 | } | |
481 | return 0; | |
d9771e8c RM |
482 | } |
483 | ||
484 | static int ptrace_set_debugreg(struct task_struct *child, | |
485 | int n, unsigned long data) | |
486 | { | |
0f534093 RM |
487 | int i; |
488 | ||
d9771e8c RM |
489 | if (unlikely(n == 4 || n == 5)) |
490 | return -EIO; | |
491 | ||
2047b08b | 492 | if (n < 4 && unlikely(data >= debugreg_addr_limit(child))) |
d9771e8c RM |
493 | return -EIO; |
494 | ||
0f534093 RM |
495 | switch (n) { |
496 | case 0: child->thread.debugreg0 = data; break; | |
497 | case 1: child->thread.debugreg1 = data; break; | |
498 | case 2: child->thread.debugreg2 = data; break; | |
499 | case 3: child->thread.debugreg3 = data; break; | |
500 | ||
501 | case 6: | |
2047b08b RM |
502 | if ((data & ~0xffffffffUL) != 0) |
503 | return -EIO; | |
0f534093 RM |
504 | child->thread.debugreg6 = data; |
505 | break; | |
506 | ||
507 | case 7: | |
d9771e8c RM |
508 | /* |
509 | * Sanity-check data. Take one half-byte at once with | |
510 | * check = (val >> (16 + 4*i)) & 0xf. It contains the | |
511 | * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits | |
512 | * 2 and 3 are LENi. Given a list of invalid values, | |
513 | * we do mask |= 1 << invalid_value, so that | |
514 | * (mask >> check) & 1 is a correct test for invalid | |
515 | * values. | |
516 | * | |
517 | * R/Wi contains the type of the breakpoint / | |
518 | * watchpoint, LENi contains the length of the watched | |
519 | * data in the watchpoint case. | |
520 | * | |
521 | * The invalid values are: | |
2047b08b | 522 | * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit] |
d9771e8c RM |
523 | * - R/Wi == 0x10 (break on I/O reads or writes), so |
524 | * mask |= 0x4444. | |
525 | * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= | |
526 | * 0x1110. | |
527 | * | |
528 | * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. | |
529 | * | |
530 | * See the Intel Manual "System Programming Guide", | |
531 | * 15.2.4 | |
532 | * | |
533 | * Note that LENi == 0x10 is defined on x86_64 in long | |
534 | * mode (i.e. even for 32-bit userspace software, but | |
535 | * 64-bit kernel), so the x86_64 mask value is 0x5454. | |
536 | * See the AMD manual no. 24593 (AMD64 System Programming) | |
537 | */ | |
2047b08b RM |
538 | #ifdef CONFIG_X86_32 |
539 | #define DR7_MASK 0x5f54 | |
540 | #else | |
541 | #define DR7_MASK 0x5554 | |
542 | #endif | |
d9771e8c RM |
543 | data &= ~DR_CONTROL_RESERVED; |
544 | for (i = 0; i < 4; i++) | |
2047b08b | 545 | if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1) |
d9771e8c | 546 | return -EIO; |
0f534093 | 547 | child->thread.debugreg7 = data; |
d9771e8c RM |
548 | if (data) |
549 | set_tsk_thread_flag(child, TIF_DEBUG); | |
550 | else | |
551 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
0f534093 | 552 | break; |
d9771e8c RM |
553 | } |
554 | ||
d9771e8c RM |
555 | return 0; |
556 | } | |
557 | ||
325af5fb RM |
558 | /* |
559 | * These access the current or another (stopped) task's io permission | |
560 | * bitmap for debugging or core dump. | |
561 | */ | |
562 | static int ioperm_active(struct task_struct *target, | |
563 | const struct user_regset *regset) | |
564 | { | |
565 | return target->thread.io_bitmap_max / regset->size; | |
566 | } | |
b4ef95de | 567 | |
325af5fb RM |
568 | static int ioperm_get(struct task_struct *target, |
569 | const struct user_regset *regset, | |
570 | unsigned int pos, unsigned int count, | |
571 | void *kbuf, void __user *ubuf) | |
eee3af4a | 572 | { |
325af5fb | 573 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
574 | return -ENXIO; |
575 | ||
325af5fb RM |
576 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
577 | target->thread.io_bitmap_ptr, | |
578 | 0, IO_BITMAP_BYTES); | |
579 | } | |
580 | ||
93fa7636 | 581 | #ifdef CONFIG_X86_PTRACE_BTS |
e2b371f0 MM |
582 | /* |
583 | * A branch trace store context. | |
584 | * | |
585 | * Contexts may only be installed by ptrace_bts_config() and only for | |
586 | * ptraced tasks. | |
587 | * | |
588 | * Contexts are destroyed when the tracee is detached from the tracer. | |
589 | * The actual destruction work requires interrupts enabled, so the | |
590 | * work is deferred and will be scheduled during __ptrace_unlink(). | |
591 | * | |
592 | * Contexts hold an additional task_struct reference on the traced | |
593 | * task, as well as a reference on the tracer's mm. | |
594 | * | |
595 | * Ptrace already holds a task_struct for the duration of ptrace operations, | |
596 | * but since destruction is deferred, it may be executed after both | |
597 | * tracer and tracee exited. | |
598 | */ | |
599 | struct bts_context { | |
600 | /* The branch trace handle. */ | |
601 | struct bts_tracer *tracer; | |
602 | ||
603 | /* The buffer used to store the branch trace and its size. */ | |
604 | void *buffer; | |
605 | unsigned int size; | |
606 | ||
607 | /* The mm that paid for the above buffer. */ | |
608 | struct mm_struct *mm; | |
609 | ||
610 | /* The task this context belongs to. */ | |
611 | struct task_struct *task; | |
612 | ||
613 | /* The signal to send on a bts buffer overflow. */ | |
614 | unsigned int bts_ovfl_signal; | |
615 | ||
616 | /* The work struct to destroy a context. */ | |
617 | struct work_struct work; | |
618 | }; | |
619 | ||
1cb81b14 | 620 | static int alloc_bts_buffer(struct bts_context *context, unsigned int size) |
e2b371f0 | 621 | { |
1cb81b14 MM |
622 | void *buffer = NULL; |
623 | int err = -ENOMEM; | |
e2b371f0 | 624 | |
1cb81b14 MM |
625 | err = account_locked_memory(current->mm, current->signal->rlim, size); |
626 | if (err < 0) | |
627 | return err; | |
628 | ||
629 | buffer = kzalloc(size, GFP_KERNEL); | |
630 | if (!buffer) | |
631 | goto out_refund; | |
632 | ||
633 | context->buffer = buffer; | |
634 | context->size = size; | |
635 | context->mm = get_task_mm(current); | |
636 | ||
637 | return 0; | |
638 | ||
639 | out_refund: | |
640 | refund_locked_memory(current->mm, size); | |
641 | return err; | |
e2b371f0 MM |
642 | } |
643 | ||
644 | static inline void free_bts_buffer(struct bts_context *context) | |
645 | { | |
646 | if (!context->buffer) | |
647 | return; | |
648 | ||
649 | kfree(context->buffer); | |
650 | context->buffer = NULL; | |
651 | ||
1cb81b14 | 652 | refund_locked_memory(context->mm, context->size); |
e2b371f0 MM |
653 | context->size = 0; |
654 | ||
655 | mmput(context->mm); | |
656 | context->mm = NULL; | |
657 | } | |
658 | ||
659 | static void free_bts_context_work(struct work_struct *w) | |
660 | { | |
661 | struct bts_context *context; | |
662 | ||
663 | context = container_of(w, struct bts_context, work); | |
664 | ||
665 | ds_release_bts(context->tracer); | |
666 | put_task_struct(context->task); | |
667 | free_bts_buffer(context); | |
668 | kfree(context); | |
669 | } | |
670 | ||
671 | static inline void free_bts_context(struct bts_context *context) | |
672 | { | |
673 | INIT_WORK(&context->work, free_bts_context_work); | |
674 | schedule_work(&context->work); | |
675 | } | |
676 | ||
677 | static inline struct bts_context *alloc_bts_context(struct task_struct *task) | |
678 | { | |
679 | struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL); | |
680 | if (context) { | |
681 | context->task = task; | |
682 | task->bts = context; | |
683 | ||
684 | get_task_struct(task); | |
685 | } | |
686 | ||
687 | return context; | |
688 | } | |
689 | ||
93fa7636 | 690 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
eee3af4a MM |
691 | struct bts_struct __user *out) |
692 | { | |
e2b371f0 | 693 | struct bts_context *context; |
c2724775 MM |
694 | const struct bts_trace *trace; |
695 | struct bts_struct bts; | |
696 | const unsigned char *at; | |
93fa7636 | 697 | int error; |
eee3af4a | 698 | |
e2b371f0 MM |
699 | context = child->bts; |
700 | if (!context) | |
701 | return -ESRCH; | |
702 | ||
703 | trace = ds_read_bts(context->tracer); | |
c2724775 | 704 | if (!trace) |
e2b371f0 | 705 | return -ESRCH; |
e4811f25 | 706 | |
c2724775 MM |
707 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
708 | if ((void *)at < trace->ds.begin) | |
709 | at += (trace->ds.n * trace->ds.size); | |
93fa7636 | 710 | |
c2724775 MM |
711 | if (!trace->read) |
712 | return -EOPNOTSUPP; | |
93fa7636 | 713 | |
e2b371f0 | 714 | error = trace->read(context->tracer, at, &bts); |
93fa7636 MM |
715 | if (error < 0) |
716 | return error; | |
e4811f25 | 717 | |
c2724775 | 718 | if (copy_to_user(out, &bts, sizeof(bts))) |
eee3af4a MM |
719 | return -EFAULT; |
720 | ||
c2724775 | 721 | return sizeof(bts); |
eee3af4a MM |
722 | } |
723 | ||
a95d67f8 | 724 | static int ptrace_bts_drain(struct task_struct *child, |
cba4b65d | 725 | long size, |
a95d67f8 MM |
726 | struct bts_struct __user *out) |
727 | { | |
e2b371f0 | 728 | struct bts_context *context; |
c2724775 MM |
729 | const struct bts_trace *trace; |
730 | const unsigned char *at; | |
731 | int error, drained = 0; | |
eee3af4a | 732 | |
e2b371f0 MM |
733 | context = child->bts; |
734 | if (!context) | |
735 | return -ESRCH; | |
736 | ||
737 | trace = ds_read_bts(context->tracer); | |
c2724775 | 738 | if (!trace) |
e2b371f0 | 739 | return -ESRCH; |
a95d67f8 | 740 | |
c2724775 MM |
741 | if (!trace->read) |
742 | return -EOPNOTSUPP; | |
743 | ||
744 | if (size < (trace->ds.top - trace->ds.begin)) | |
cba4b65d MM |
745 | return -EIO; |
746 | ||
c2724775 MM |
747 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
748 | out++, drained++, at += trace->ds.size) { | |
749 | struct bts_struct bts; | |
a95d67f8 | 750 | |
e2b371f0 | 751 | error = trace->read(context->tracer, at, &bts); |
c2724775 MM |
752 | if (error < 0) |
753 | return error; | |
a95d67f8 | 754 | |
c2724775 | 755 | if (copy_to_user(out, &bts, sizeof(bts))) |
a95d67f8 MM |
756 | return -EFAULT; |
757 | } | |
758 | ||
c2724775 MM |
759 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
760 | ||
e2b371f0 | 761 | error = ds_reset_bts(context->tracer); |
93fa7636 MM |
762 | if (error < 0) |
763 | return error; | |
a95d67f8 | 764 | |
c2724775 | 765 | return drained; |
a95d67f8 MM |
766 | } |
767 | ||
768 | static int ptrace_bts_config(struct task_struct *child, | |
cba4b65d | 769 | long cfg_size, |
a95d67f8 MM |
770 | const struct ptrace_bts_config __user *ucfg) |
771 | { | |
e2b371f0 | 772 | struct bts_context *context; |
a95d67f8 | 773 | struct ptrace_bts_config cfg; |
c2724775 | 774 | unsigned int flags = 0; |
a95d67f8 | 775 | |
cba4b65d | 776 | if (cfg_size < sizeof(cfg)) |
c2724775 | 777 | return -EIO; |
cba4b65d | 778 | |
a95d67f8 | 779 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
c2724775 | 780 | return -EFAULT; |
6abb11ae | 781 | |
e2b371f0 MM |
782 | context = child->bts; |
783 | if (!context) | |
784 | context = alloc_bts_context(child); | |
785 | if (!context) | |
786 | return -ENOMEM; | |
93fa7636 | 787 | |
c2724775 MM |
788 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
789 | if (!cfg.signal) | |
790 | return -EINVAL; | |
ca0002a1 | 791 | |
5a8ac9d2 | 792 | return -EOPNOTSUPP; |
e2b371f0 | 793 | context->bts_ovfl_signal = cfg.signal; |
c2724775 | 794 | } |
6abb11ae | 795 | |
e2b371f0 MM |
796 | ds_release_bts(context->tracer); |
797 | context->tracer = NULL; | |
6abb11ae | 798 | |
e2b371f0 | 799 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) { |
1cb81b14 MM |
800 | int err; |
801 | ||
e2b371f0 MM |
802 | free_bts_buffer(context); |
803 | if (!cfg.size) | |
804 | return 0; | |
c5dee617 | 805 | |
1cb81b14 MM |
806 | err = alloc_bts_buffer(context, cfg.size); |
807 | if (err < 0) | |
808 | return err; | |
a95d67f8 MM |
809 | } |
810 | ||
da35c371 | 811 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
c2724775 | 812 | flags |= BTS_USER; |
eee3af4a | 813 | |
da35c371 | 814 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
c2724775 | 815 | flags |= BTS_TIMESTAMPS; |
eee3af4a | 816 | |
de79f54f MM |
817 | context->tracer = |
818 | ds_request_bts_task(child, context->buffer, context->size, | |
819 | NULL, (size_t)-1, flags); | |
e2b371f0 MM |
820 | if (unlikely(IS_ERR(context->tracer))) { |
821 | int error = PTR_ERR(context->tracer); | |
da35c371 | 822 | |
e2b371f0 MM |
823 | free_bts_buffer(context); |
824 | context->tracer = NULL; | |
c2724775 MM |
825 | return error; |
826 | } | |
da35c371 | 827 | |
c2724775 | 828 | return sizeof(cfg); |
eee3af4a MM |
829 | } |
830 | ||
a95d67f8 | 831 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 832 | long cfg_size, |
a95d67f8 | 833 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 834 | { |
e2b371f0 | 835 | struct bts_context *context; |
c2724775 | 836 | const struct bts_trace *trace; |
a95d67f8 | 837 | struct ptrace_bts_config cfg; |
eee3af4a | 838 | |
e2b371f0 MM |
839 | context = child->bts; |
840 | if (!context) | |
841 | return -ESRCH; | |
842 | ||
cba4b65d MM |
843 | if (cfg_size < sizeof(cfg)) |
844 | return -EIO; | |
845 | ||
e2b371f0 | 846 | trace = ds_read_bts(context->tracer); |
c2724775 | 847 | if (!trace) |
e2b371f0 | 848 | return -ESRCH; |
eee3af4a | 849 | |
93fa7636 | 850 | memset(&cfg, 0, sizeof(cfg)); |
e2b371f0 MM |
851 | cfg.size = trace->ds.end - trace->ds.begin; |
852 | cfg.signal = context->bts_ovfl_signal; | |
853 | cfg.bts_size = sizeof(struct bts_struct); | |
eee3af4a | 854 | |
93fa7636 MM |
855 | if (cfg.signal) |
856 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 857 | |
c2724775 | 858 | if (trace->ds.flags & BTS_USER) |
93fa7636 MM |
859 | cfg.flags |= PTRACE_BTS_O_TRACE; |
860 | ||
c2724775 | 861 | if (trace->ds.flags & BTS_TIMESTAMPS) |
93fa7636 | 862 | cfg.flags |= PTRACE_BTS_O_SCHED; |
87e8407f | 863 | |
a95d67f8 MM |
864 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
865 | return -EFAULT; | |
eee3af4a | 866 | |
a95d67f8 | 867 | return sizeof(cfg); |
eee3af4a MM |
868 | } |
869 | ||
c2724775 | 870 | static int ptrace_bts_clear(struct task_struct *child) |
d8d4f157 | 871 | { |
e2b371f0 | 872 | struct bts_context *context; |
c2724775 | 873 | const struct bts_trace *trace; |
d8d4f157 | 874 | |
e2b371f0 MM |
875 | context = child->bts; |
876 | if (!context) | |
877 | return -ESRCH; | |
878 | ||
879 | trace = ds_read_bts(context->tracer); | |
c2724775 | 880 | if (!trace) |
e2b371f0 | 881 | return -ESRCH; |
d8d4f157 | 882 | |
c2724775 | 883 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
d8d4f157 | 884 | |
e2b371f0 | 885 | return ds_reset_bts(context->tracer); |
d8d4f157 AM |
886 | } |
887 | ||
c2724775 | 888 | static int ptrace_bts_size(struct task_struct *child) |
eee3af4a | 889 | { |
e2b371f0 | 890 | struct bts_context *context; |
c2724775 | 891 | const struct bts_trace *trace; |
93fa7636 | 892 | |
e2b371f0 MM |
893 | context = child->bts; |
894 | if (!context) | |
895 | return -ESRCH; | |
896 | ||
897 | trace = ds_read_bts(context->tracer); | |
c2724775 | 898 | if (!trace) |
e2b371f0 | 899 | return -ESRCH; |
93fa7636 | 900 | |
c2724775 | 901 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
93fa7636 | 902 | } |
bf53de90 | 903 | |
e2b371f0 MM |
904 | /* |
905 | * Called from __ptrace_unlink() after the child has been moved back | |
906 | * to its original parent. | |
907 | */ | |
0f481406 | 908 | void ptrace_bts_untrace(struct task_struct *child) |
bf53de90 MM |
909 | { |
910 | if (unlikely(child->bts)) { | |
e2b371f0 | 911 | free_bts_context(child->bts); |
bf53de90 | 912 | child->bts = NULL; |
bf53de90 MM |
913 | } |
914 | } | |
93fa7636 | 915 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 916 | |
1da177e4 LT |
917 | /* |
918 | * Called by kernel/ptrace.c when detaching.. | |
919 | * | |
920 | * Make sure the single step bit is not set. | |
921 | */ | |
922 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 923 | { |
7f232343 | 924 | user_disable_single_step(child); |
e9c86c78 | 925 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 926 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 927 | #endif |
1da177e4 LT |
928 | } |
929 | ||
5a4646a4 RM |
930 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
931 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
932 | #endif | |
933 | ||
481bed45 | 934 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 935 | { |
5a4646a4 | 936 | int ret; |
1da177e4 LT |
937 | unsigned long __user *datap = (unsigned long __user *)data; |
938 | ||
1da177e4 | 939 | switch (request) { |
1da177e4 LT |
940 | /* read the word at location addr in the USER area. */ |
941 | case PTRACE_PEEKUSR: { | |
942 | unsigned long tmp; | |
943 | ||
944 | ret = -EIO; | |
e9c86c78 RM |
945 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
946 | addr >= sizeof(struct user)) | |
1da177e4 LT |
947 | break; |
948 | ||
949 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 950 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 951 | tmp = getreg(child, addr); |
e9c86c78 RM |
952 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
953 | addr <= offsetof(struct user, u_debugreg[7])) { | |
954 | addr -= offsetof(struct user, u_debugreg[0]); | |
955 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
956 | } |
957 | ret = put_user(tmp, datap); | |
958 | break; | |
959 | } | |
960 | ||
1da177e4 LT |
961 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
962 | ret = -EIO; | |
e9c86c78 RM |
963 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
964 | addr >= sizeof(struct user)) | |
1da177e4 LT |
965 | break; |
966 | ||
e9c86c78 | 967 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 968 | ret = putreg(child, addr, data); |
e9c86c78 RM |
969 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
970 | addr <= offsetof(struct user, u_debugreg[7])) { | |
971 | addr -= offsetof(struct user, u_debugreg[0]); | |
972 | ret = ptrace_set_debugreg(child, | |
973 | addr / sizeof(data), data); | |
1da177e4 | 974 | } |
e9c86c78 | 975 | break; |
1da177e4 | 976 | |
5a4646a4 RM |
977 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
978 | return copy_regset_to_user(child, | |
979 | task_user_regset_view(current), | |
980 | REGSET_GENERAL, | |
981 | 0, sizeof(struct user_regs_struct), | |
982 | datap); | |
983 | ||
984 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
985 | return copy_regset_from_user(child, | |
986 | task_user_regset_view(current), | |
987 | REGSET_GENERAL, | |
988 | 0, sizeof(struct user_regs_struct), | |
989 | datap); | |
990 | ||
991 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
992 | return copy_regset_to_user(child, | |
993 | task_user_regset_view(current), | |
994 | REGSET_FP, | |
995 | 0, sizeof(struct user_i387_struct), | |
996 | datap); | |
997 | ||
998 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
999 | return copy_regset_from_user(child, | |
1000 | task_user_regset_view(current), | |
1001 | REGSET_FP, | |
1002 | 0, sizeof(struct user_i387_struct), | |
1003 | datap); | |
1da177e4 | 1004 | |
e9c86c78 | 1005 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
1006 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
1007 | return copy_regset_to_user(child, &user_x86_32_view, | |
1008 | REGSET_XFP, | |
1009 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1010 | datap) ? -EIO : 0; |
5a4646a4 RM |
1011 | |
1012 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1013 | return copy_regset_from_user(child, &user_x86_32_view, | |
1014 | REGSET_XFP, | |
1015 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1016 | datap) ? -EIO : 0; |
e9c86c78 | 1017 | #endif |
1da177e4 | 1018 | |
e9c86c78 | 1019 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 1020 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
1021 | if (addr < 0) |
1022 | return -EIO; | |
1023 | ret = do_get_thread_area(child, addr, | |
1024 | (struct user_desc __user *) data); | |
1da177e4 LT |
1025 | break; |
1026 | ||
1027 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
1028 | if (addr < 0) |
1029 | return -EIO; | |
1030 | ret = do_set_thread_area(child, addr, | |
1031 | (struct user_desc __user *) data, 0); | |
1da177e4 | 1032 | break; |
e9c86c78 RM |
1033 | #endif |
1034 | ||
1035 | #ifdef CONFIG_X86_64 | |
1036 | /* normal 64bit interface to access TLS data. | |
1037 | Works just like arch_prctl, except that the arguments | |
1038 | are reversed. */ | |
1039 | case PTRACE_ARCH_PRCTL: | |
1040 | ret = do_arch_prctl(child, data, addr); | |
1041 | break; | |
1042 | #endif | |
1da177e4 | 1043 | |
b4ef95de IM |
1044 | /* |
1045 | * These bits need more cooking - not enabled yet: | |
1046 | */ | |
93fa7636 | 1047 | #ifdef CONFIG_X86_PTRACE_BTS |
a95d67f8 MM |
1048 | case PTRACE_BTS_CONFIG: |
1049 | ret = ptrace_bts_config | |
cba4b65d | 1050 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1051 | break; |
1052 | ||
a95d67f8 MM |
1053 | case PTRACE_BTS_STATUS: |
1054 | ret = ptrace_bts_status | |
cba4b65d | 1055 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1056 | break; |
1057 | ||
c2724775 MM |
1058 | case PTRACE_BTS_SIZE: |
1059 | ret = ptrace_bts_size(child); | |
eee3af4a MM |
1060 | break; |
1061 | ||
a95d67f8 | 1062 | case PTRACE_BTS_GET: |
eee3af4a | 1063 | ret = ptrace_bts_read_record |
a95d67f8 | 1064 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
1065 | break; |
1066 | ||
a95d67f8 | 1067 | case PTRACE_BTS_CLEAR: |
c2724775 | 1068 | ret = ptrace_bts_clear(child); |
eee3af4a MM |
1069 | break; |
1070 | ||
a95d67f8 MM |
1071 | case PTRACE_BTS_DRAIN: |
1072 | ret = ptrace_bts_drain | |
cba4b65d | 1073 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 1074 | break; |
93fa7636 | 1075 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1076 | |
1da177e4 LT |
1077 | default: |
1078 | ret = ptrace_request(child, request, addr, data); | |
1079 | break; | |
1080 | } | |
d9771e8c | 1081 | |
1da177e4 LT |
1082 | return ret; |
1083 | } | |
1084 | ||
cb757c41 RM |
1085 | #ifdef CONFIG_IA32_EMULATION |
1086 | ||
099cd6e9 RM |
1087 | #include <linux/compat.h> |
1088 | #include <linux/syscalls.h> | |
1089 | #include <asm/ia32.h> | |
cb757c41 RM |
1090 | #include <asm/user32.h> |
1091 | ||
1092 | #define R32(l,q) \ | |
1093 | case offsetof(struct user32, regs.l): \ | |
1094 | regs->q = value; break | |
1095 | ||
1096 | #define SEG32(rs) \ | |
1097 | case offsetof(struct user32, regs.rs): \ | |
1098 | return set_segment_reg(child, \ | |
1099 | offsetof(struct user_regs_struct, rs), \ | |
1100 | value); \ | |
1101 | break | |
1102 | ||
1103 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1104 | { | |
1105 | struct pt_regs *regs = task_pt_regs(child); | |
1106 | ||
1107 | switch (regno) { | |
1108 | ||
1109 | SEG32(cs); | |
1110 | SEG32(ds); | |
1111 | SEG32(es); | |
1112 | SEG32(fs); | |
1113 | SEG32(gs); | |
1114 | SEG32(ss); | |
1115 | ||
1116 | R32(ebx, bx); | |
1117 | R32(ecx, cx); | |
1118 | R32(edx, dx); | |
1119 | R32(edi, di); | |
1120 | R32(esi, si); | |
1121 | R32(ebp, bp); | |
1122 | R32(eax, ax); | |
cb757c41 RM |
1123 | R32(eip, ip); |
1124 | R32(esp, sp); | |
1125 | ||
40f0933d RM |
1126 | case offsetof(struct user32, regs.orig_eax): |
1127 | /* | |
1128 | * Sign-extend the value so that orig_eax = -1 | |
1129 | * causes (long)orig_ax < 0 tests to fire correctly. | |
1130 | */ | |
1131 | regs->orig_ax = (long) (s32) value; | |
1132 | break; | |
1133 | ||
cb757c41 RM |
1134 | case offsetof(struct user32, regs.eflags): |
1135 | return set_flags(child, value); | |
1136 | ||
1137 | case offsetof(struct user32, u_debugreg[0]) ... | |
1138 | offsetof(struct user32, u_debugreg[7]): | |
1139 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1140 | return ptrace_set_debugreg(child, regno / 4, value); | |
1141 | ||
1142 | default: | |
1143 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1144 | return -EIO; | |
1145 | ||
1146 | /* | |
1147 | * Other dummy fields in the virtual user structure | |
1148 | * are ignored | |
1149 | */ | |
1150 | break; | |
1151 | } | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | #undef R32 | |
1156 | #undef SEG32 | |
1157 | ||
1158 | #define R32(l,q) \ | |
1159 | case offsetof(struct user32, regs.l): \ | |
1160 | *val = regs->q; break | |
1161 | ||
1162 | #define SEG32(rs) \ | |
1163 | case offsetof(struct user32, regs.rs): \ | |
1164 | *val = get_segment_reg(child, \ | |
1165 | offsetof(struct user_regs_struct, rs)); \ | |
1166 | break | |
1167 | ||
1168 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1169 | { | |
1170 | struct pt_regs *regs = task_pt_regs(child); | |
1171 | ||
1172 | switch (regno) { | |
1173 | ||
1174 | SEG32(ds); | |
1175 | SEG32(es); | |
1176 | SEG32(fs); | |
1177 | SEG32(gs); | |
1178 | ||
1179 | R32(cs, cs); | |
1180 | R32(ss, ss); | |
1181 | R32(ebx, bx); | |
1182 | R32(ecx, cx); | |
1183 | R32(edx, dx); | |
1184 | R32(edi, di); | |
1185 | R32(esi, si); | |
1186 | R32(ebp, bp); | |
1187 | R32(eax, ax); | |
1188 | R32(orig_eax, orig_ax); | |
1189 | R32(eip, ip); | |
1190 | R32(esp, sp); | |
1191 | ||
1192 | case offsetof(struct user32, regs.eflags): | |
1193 | *val = get_flags(child); | |
1194 | break; | |
1195 | ||
1196 | case offsetof(struct user32, u_debugreg[0]) ... | |
1197 | offsetof(struct user32, u_debugreg[7]): | |
1198 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1199 | *val = ptrace_get_debugreg(child, regno / 4); | |
1200 | break; | |
1201 | ||
1202 | default: | |
1203 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1204 | return -EIO; | |
1205 | ||
1206 | /* | |
1207 | * Other dummy fields in the virtual user structure | |
1208 | * are ignored | |
1209 | */ | |
1210 | *val = 0; | |
1211 | break; | |
1212 | } | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | #undef R32 | |
1217 | #undef SEG32 | |
1218 | ||
91e7b707 RM |
1219 | static int genregs32_get(struct task_struct *target, |
1220 | const struct user_regset *regset, | |
1221 | unsigned int pos, unsigned int count, | |
1222 | void *kbuf, void __user *ubuf) | |
1223 | { | |
1224 | if (kbuf) { | |
1225 | compat_ulong_t *k = kbuf; | |
1226 | while (count > 0) { | |
1227 | getreg32(target, pos, k++); | |
1228 | count -= sizeof(*k); | |
1229 | pos += sizeof(*k); | |
1230 | } | |
1231 | } else { | |
1232 | compat_ulong_t __user *u = ubuf; | |
1233 | while (count > 0) { | |
1234 | compat_ulong_t word; | |
1235 | getreg32(target, pos, &word); | |
1236 | if (__put_user(word, u++)) | |
1237 | return -EFAULT; | |
1238 | count -= sizeof(*u); | |
1239 | pos += sizeof(*u); | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | static int genregs32_set(struct task_struct *target, | |
1247 | const struct user_regset *regset, | |
1248 | unsigned int pos, unsigned int count, | |
1249 | const void *kbuf, const void __user *ubuf) | |
1250 | { | |
1251 | int ret = 0; | |
1252 | if (kbuf) { | |
1253 | const compat_ulong_t *k = kbuf; | |
1254 | while (count > 0 && !ret) { | |
f9cb02b0 | 1255 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1256 | count -= sizeof(*k); |
1257 | pos += sizeof(*k); | |
1258 | } | |
1259 | } else { | |
1260 | const compat_ulong_t __user *u = ubuf; | |
1261 | while (count > 0 && !ret) { | |
1262 | compat_ulong_t word; | |
1263 | ret = __get_user(word, u++); | |
1264 | if (ret) | |
1265 | break; | |
f9cb02b0 | 1266 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1267 | count -= sizeof(*u); |
1268 | pos += sizeof(*u); | |
1269 | } | |
1270 | } | |
1271 | return ret; | |
1272 | } | |
1273 | ||
562b80ba RM |
1274 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1275 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1276 | { |
562b80ba RM |
1277 | unsigned long addr = caddr; |
1278 | unsigned long data = cdata; | |
099cd6e9 RM |
1279 | void __user *datap = compat_ptr(data); |
1280 | int ret; | |
1281 | __u32 val; | |
1282 | ||
099cd6e9 | 1283 | switch (request) { |
099cd6e9 RM |
1284 | case PTRACE_PEEKUSR: |
1285 | ret = getreg32(child, addr, &val); | |
1286 | if (ret == 0) | |
1287 | ret = put_user(val, (__u32 __user *)datap); | |
1288 | break; | |
1289 | ||
1290 | case PTRACE_POKEUSR: | |
1291 | ret = putreg32(child, addr, data); | |
1292 | break; | |
1293 | ||
5a4646a4 RM |
1294 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1295 | return copy_regset_to_user(child, &user_x86_32_view, | |
1296 | REGSET_GENERAL, | |
1297 | 0, sizeof(struct user_regs_struct32), | |
1298 | datap); | |
1299 | ||
1300 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1301 | return copy_regset_from_user(child, &user_x86_32_view, | |
1302 | REGSET_GENERAL, 0, | |
1303 | sizeof(struct user_regs_struct32), | |
1304 | datap); | |
1305 | ||
1306 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1307 | return copy_regset_to_user(child, &user_x86_32_view, | |
1308 | REGSET_FP, 0, | |
1309 | sizeof(struct user_i387_ia32_struct), | |
1310 | datap); | |
1311 | ||
1312 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1313 | return copy_regset_from_user( | |
1314 | child, &user_x86_32_view, REGSET_FP, | |
1315 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1316 | ||
1317 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1318 | return copy_regset_to_user(child, &user_x86_32_view, | |
1319 | REGSET_XFP, 0, | |
1320 | sizeof(struct user32_fxsr_struct), | |
1321 | datap); | |
1322 | ||
1323 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1324 | return copy_regset_from_user(child, &user_x86_32_view, | |
1325 | REGSET_XFP, 0, | |
1326 | sizeof(struct user32_fxsr_struct), | |
1327 | datap); | |
099cd6e9 | 1328 | |
562b80ba RM |
1329 | case PTRACE_GET_THREAD_AREA: |
1330 | case PTRACE_SET_THREAD_AREA: | |
c2724775 MM |
1331 | #ifdef CONFIG_X86_PTRACE_BTS |
1332 | case PTRACE_BTS_CONFIG: | |
1333 | case PTRACE_BTS_STATUS: | |
1334 | case PTRACE_BTS_SIZE: | |
1335 | case PTRACE_BTS_GET: | |
1336 | case PTRACE_BTS_CLEAR: | |
1337 | case PTRACE_BTS_DRAIN: | |
1338 | #endif /* CONFIG_X86_PTRACE_BTS */ | |
562b80ba RM |
1339 | return arch_ptrace(child, request, addr, data); |
1340 | ||
099cd6e9 | 1341 | default: |
fdadd54d | 1342 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1343 | } |
1344 | ||
099cd6e9 RM |
1345 | return ret; |
1346 | } | |
1347 | ||
cb757c41 RM |
1348 | #endif /* CONFIG_IA32_EMULATION */ |
1349 | ||
070459d9 RM |
1350 | #ifdef CONFIG_X86_64 |
1351 | ||
1352 | static const struct user_regset x86_64_regsets[] = { | |
1353 | [REGSET_GENERAL] = { | |
1354 | .core_note_type = NT_PRSTATUS, | |
1355 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1356 | .size = sizeof(long), .align = sizeof(long), | |
1357 | .get = genregs_get, .set = genregs_set | |
1358 | }, | |
1359 | [REGSET_FP] = { | |
1360 | .core_note_type = NT_PRFPREG, | |
1361 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1362 | .size = sizeof(long), .align = sizeof(long), | |
1363 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1364 | }, | |
325af5fb RM |
1365 | [REGSET_IOPERM64] = { |
1366 | .core_note_type = NT_386_IOPERM, | |
1367 | .n = IO_BITMAP_LONGS, | |
1368 | .size = sizeof(long), .align = sizeof(long), | |
1369 | .active = ioperm_active, .get = ioperm_get | |
1370 | }, | |
070459d9 RM |
1371 | }; |
1372 | ||
1373 | static const struct user_regset_view user_x86_64_view = { | |
1374 | .name = "x86_64", .e_machine = EM_X86_64, | |
1375 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1376 | }; | |
1377 | ||
1378 | #else /* CONFIG_X86_32 */ | |
1379 | ||
1380 | #define user_regs_struct32 user_regs_struct | |
1381 | #define genregs32_get genregs_get | |
1382 | #define genregs32_set genregs_set | |
1383 | ||
1f465f4e RM |
1384 | #define user_i387_ia32_struct user_i387_struct |
1385 | #define user32_fxsr_struct user_fxsr_struct | |
1386 | ||
070459d9 RM |
1387 | #endif /* CONFIG_X86_64 */ |
1388 | ||
1389 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1390 | static const struct user_regset x86_32_regsets[] = { | |
1391 | [REGSET_GENERAL] = { | |
1392 | .core_note_type = NT_PRSTATUS, | |
1393 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1394 | .size = sizeof(u32), .align = sizeof(u32), | |
1395 | .get = genregs32_get, .set = genregs32_set | |
1396 | }, | |
1397 | [REGSET_FP] = { | |
1398 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1399 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1400 | .size = sizeof(u32), .align = sizeof(u32), |
1401 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1402 | }, | |
1403 | [REGSET_XFP] = { | |
1404 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1405 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1406 | .size = sizeof(u32), .align = sizeof(u32), |
1407 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1408 | }, | |
1409 | [REGSET_TLS] = { | |
bb61682b | 1410 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1411 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1412 | .size = sizeof(struct user_desc), | |
1413 | .align = sizeof(struct user_desc), | |
1414 | .active = regset_tls_active, | |
1415 | .get = regset_tls_get, .set = regset_tls_set | |
1416 | }, | |
325af5fb RM |
1417 | [REGSET_IOPERM32] = { |
1418 | .core_note_type = NT_386_IOPERM, | |
1419 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1420 | .size = sizeof(u32), .align = sizeof(u32), | |
1421 | .active = ioperm_active, .get = ioperm_get | |
1422 | }, | |
070459d9 RM |
1423 | }; |
1424 | ||
1425 | static const struct user_regset_view user_x86_32_view = { | |
1426 | .name = "i386", .e_machine = EM_386, | |
1427 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1428 | }; | |
1429 | #endif | |
1430 | ||
1431 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1432 | { | |
1433 | #ifdef CONFIG_IA32_EMULATION | |
1434 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1435 | #endif | |
1436 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1437 | return &user_x86_32_view; | |
1438 | #endif | |
1439 | #ifdef CONFIG_X86_64 | |
1440 | return &user_x86_64_view; | |
1441 | #endif | |
1442 | } | |
1443 | ||
da654b74 SD |
1444 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1445 | int error_code, int si_code) | |
1da177e4 LT |
1446 | { |
1447 | struct siginfo info; | |
1448 | ||
1449 | tsk->thread.trap_no = 1; | |
1450 | tsk->thread.error_code = error_code; | |
1451 | ||
1452 | memset(&info, 0, sizeof(info)); | |
1453 | info.si_signo = SIGTRAP; | |
da654b74 | 1454 | info.si_code = si_code; |
1da177e4 | 1455 | |
65ea5b03 PA |
1456 | /* User-mode ip? */ |
1457 | info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; | |
1da177e4 | 1458 | |
27b46d76 | 1459 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1460 | force_sig_info(SIGTRAP, &info, tsk); |
1461 | } | |
1462 | ||
86976cd8 | 1463 | |
d4d67150 RM |
1464 | #ifdef CONFIG_X86_32 |
1465 | # define IS_IA32 1 | |
1466 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1467 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1468 | #else |
1469 | # define IS_IA32 0 | |
1470 | #endif | |
1471 | ||
1472 | /* | |
1473 | * We must return the syscall number to actually look up in the table. | |
1474 | * This can be -1L to skip running any syscall at all. | |
1475 | */ | |
1476 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1477 | { |
d4d67150 RM |
1478 | long ret = 0; |
1479 | ||
380fdd75 RM |
1480 | /* |
1481 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1482 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1483 | * If user-mode had set TF itself, then it's still clear from | |
1484 | * do_debug() and we need to set it again to restore the user | |
1485 | * state. If we entered on the slow path, TF was already set. | |
1486 | */ | |
1487 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1488 | regs->flags |= X86_EFLAGS_TF; | |
1489 | ||
86976cd8 RM |
1490 | /* do the secure computing check first */ |
1491 | secure_computing(regs->orig_ax); | |
1492 | ||
d4d67150 RM |
1493 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1494 | ret = -1L; | |
1495 | ||
eeea3c3f RM |
1496 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1497 | tracehook_report_syscall_entry(regs)) | |
1498 | ret = -1L; | |
86976cd8 | 1499 | |
1b3fa2ce FW |
1500 | if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) |
1501 | ftrace_syscall_enter(regs); | |
1502 | ||
86976cd8 | 1503 | if (unlikely(current->audit_context)) { |
d4d67150 | 1504 | if (IS_IA32) |
86976cd8 RM |
1505 | audit_syscall_entry(AUDIT_ARCH_I386, |
1506 | regs->orig_ax, | |
1507 | regs->bx, regs->cx, | |
1508 | regs->dx, regs->si); | |
d4d67150 RM |
1509 | #ifdef CONFIG_X86_64 |
1510 | else | |
86976cd8 RM |
1511 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1512 | regs->orig_ax, | |
1513 | regs->di, regs->si, | |
1514 | regs->dx, regs->r10); | |
d4d67150 | 1515 | #endif |
86976cd8 | 1516 | } |
d4d67150 RM |
1517 | |
1518 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1519 | } |
1520 | ||
d4d67150 | 1521 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 RM |
1522 | { |
1523 | if (unlikely(current->audit_context)) | |
1524 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1525 | ||
1b3fa2ce FW |
1526 | if (unlikely(test_thread_flag(TIF_SYSCALL_FTRACE))) |
1527 | ftrace_syscall_exit(regs); | |
1528 | ||
d4d67150 | 1529 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
eeea3c3f | 1530 | tracehook_report_syscall_exit(regs, 0); |
86976cd8 | 1531 | |
d4d67150 RM |
1532 | /* |
1533 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1534 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1535 | * We already reported this syscall instruction in | |
1536 | * syscall_trace_enter(), so don't do any more now. | |
1537 | */ | |
1538 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) | |
1539 | return; | |
1540 | ||
1541 | /* | |
1542 | * If we are single-stepping, synthesize a trap to follow the | |
1543 | * system call instruction. | |
1544 | */ | |
1545 | if (test_thread_flag(TIF_SINGLESTEP) && | |
43918f2b | 1546 | tracehook_consider_fatal_signal(current, SIGTRAP)) |
da654b74 | 1547 | send_sigtrap(current, regs, 0, TRAP_BRKPT); |
d4d67150 | 1548 | } |