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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 | ||
070459d9 RM |
38 | #include "tls.h" |
39 | ||
1c569f02 JS |
40 | #define CREATE_TRACE_POINTS |
41 | #include <trace/events/syscalls.h> | |
42 | ||
070459d9 RM |
43 | enum x86_regset { |
44 | REGSET_GENERAL, | |
45 | REGSET_FP, | |
46 | REGSET_XFP, | |
325af5fb | 47 | REGSET_IOPERM64 = REGSET_XFP, |
070459d9 | 48 | REGSET_TLS, |
325af5fb | 49 | REGSET_IOPERM32, |
070459d9 | 50 | }; |
eee3af4a | 51 | |
1da177e4 LT |
52 | /* |
53 | * does not yet catch signals sent when the child dies. | |
54 | * in exit.c or in signal.c. | |
55 | */ | |
56 | ||
9f155b98 CE |
57 | /* |
58 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 59 | */ |
e39c2891 RM |
60 | #define FLAG_MASK_32 ((unsigned long) \ |
61 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
62 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
63 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
64 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
65 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
66 | ||
2047b08b RM |
67 | /* |
68 | * Determines whether a value may be installed in a segment register. | |
69 | */ | |
70 | static inline bool invalid_selector(u16 value) | |
71 | { | |
72 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
73 | } | |
74 | ||
75 | #ifdef CONFIG_X86_32 | |
76 | ||
e39c2891 | 77 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 78 | |
4fe702c7 | 79 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 80 | { |
65ea5b03 | 81 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
ccbeed3a | 82 | return ®s->bx + (regno >> 2); |
1da177e4 LT |
83 | } |
84 | ||
06ee1b68 | 85 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
1da177e4 | 86 | { |
06ee1b68 RM |
87 | /* |
88 | * Returning the value truncates it to 16 bits. | |
89 | */ | |
90 | unsigned int retval; | |
91 | if (offset != offsetof(struct user_regs_struct, gs)) | |
92 | retval = *pt_regs_access(task_pt_regs(task), offset); | |
93 | else { | |
06ee1b68 | 94 | if (task == current) |
d9a89a26 TH |
95 | retval = get_user_gs(task_pt_regs(task)); |
96 | else | |
97 | retval = task_user_gs(task); | |
06ee1b68 RM |
98 | } |
99 | return retval; | |
100 | } | |
101 | ||
102 | static int set_segment_reg(struct task_struct *task, | |
103 | unsigned long offset, u16 value) | |
104 | { | |
105 | /* | |
106 | * The value argument was already truncated to 16 bits. | |
107 | */ | |
2047b08b | 108 | if (invalid_selector(value)) |
06ee1b68 RM |
109 | return -EIO; |
110 | ||
c63855d0 RM |
111 | /* |
112 | * For %cs and %ss we cannot permit a null selector. | |
113 | * We can permit a bogus selector as long as it has USER_RPL. | |
114 | * Null selectors are fine for other segment registers, but | |
115 | * we will never get back to user mode with invalid %cs or %ss | |
116 | * and will take the trap in iret instead. Much code relies | |
117 | * on user_mode() to distinguish a user trap frame (which can | |
118 | * safely use invalid selectors) from a kernel trap frame. | |
119 | */ | |
120 | switch (offset) { | |
121 | case offsetof(struct user_regs_struct, cs): | |
122 | case offsetof(struct user_regs_struct, ss): | |
123 | if (unlikely(value == 0)) | |
124 | return -EIO; | |
125 | ||
126 | default: | |
06ee1b68 | 127 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
128 | break; |
129 | ||
130 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 | 131 | if (task == current) |
d9a89a26 TH |
132 | set_user_gs(task_pt_regs(task), value); |
133 | else | |
134 | task_user_gs(task) = value; | |
1da177e4 | 135 | } |
06ee1b68 | 136 | |
1da177e4 LT |
137 | return 0; |
138 | } | |
139 | ||
2047b08b RM |
140 | static unsigned long debugreg_addr_limit(struct task_struct *task) |
141 | { | |
142 | return TASK_SIZE - 3; | |
143 | } | |
144 | ||
145 | #else /* CONFIG_X86_64 */ | |
146 | ||
147 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
148 | ||
149 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
150 | { | |
151 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
152 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
153 | } | |
154 | ||
155 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
156 | { | |
157 | /* | |
158 | * Returning the value truncates it to 16 bits. | |
159 | */ | |
160 | unsigned int seg; | |
161 | ||
162 | switch (offset) { | |
163 | case offsetof(struct user_regs_struct, fs): | |
164 | if (task == current) { | |
165 | /* Older gas can't assemble movq %?s,%r?? */ | |
166 | asm("movl %%fs,%0" : "=r" (seg)); | |
167 | return seg; | |
168 | } | |
169 | return task->thread.fsindex; | |
170 | case offsetof(struct user_regs_struct, gs): | |
171 | if (task == current) { | |
172 | asm("movl %%gs,%0" : "=r" (seg)); | |
173 | return seg; | |
174 | } | |
175 | return task->thread.gsindex; | |
176 | case offsetof(struct user_regs_struct, ds): | |
177 | if (task == current) { | |
178 | asm("movl %%ds,%0" : "=r" (seg)); | |
179 | return seg; | |
180 | } | |
181 | return task->thread.ds; | |
182 | case offsetof(struct user_regs_struct, es): | |
183 | if (task == current) { | |
184 | asm("movl %%es,%0" : "=r" (seg)); | |
185 | return seg; | |
186 | } | |
187 | return task->thread.es; | |
188 | ||
189 | case offsetof(struct user_regs_struct, cs): | |
190 | case offsetof(struct user_regs_struct, ss): | |
191 | break; | |
192 | } | |
193 | return *pt_regs_access(task_pt_regs(task), offset); | |
194 | } | |
195 | ||
196 | static int set_segment_reg(struct task_struct *task, | |
197 | unsigned long offset, u16 value) | |
198 | { | |
199 | /* | |
200 | * The value argument was already truncated to 16 bits. | |
201 | */ | |
202 | if (invalid_selector(value)) | |
203 | return -EIO; | |
204 | ||
205 | switch (offset) { | |
206 | case offsetof(struct user_regs_struct,fs): | |
207 | /* | |
208 | * If this is setting fs as for normal 64-bit use but | |
209 | * setting fs_base has implicitly changed it, leave it. | |
210 | */ | |
211 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
212 | task->thread.fs != 0) || | |
213 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
214 | task->thread.fs == 0)) | |
215 | break; | |
216 | task->thread.fsindex = value; | |
217 | if (task == current) | |
218 | loadsegment(fs, task->thread.fsindex); | |
219 | break; | |
220 | case offsetof(struct user_regs_struct,gs): | |
221 | /* | |
222 | * If this is setting gs as for normal 64-bit use but | |
223 | * setting gs_base has implicitly changed it, leave it. | |
224 | */ | |
225 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
226 | task->thread.gs != 0) || | |
227 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
228 | task->thread.gs == 0)) | |
229 | break; | |
230 | task->thread.gsindex = value; | |
231 | if (task == current) | |
232 | load_gs_index(task->thread.gsindex); | |
233 | break; | |
234 | case offsetof(struct user_regs_struct,ds): | |
235 | task->thread.ds = value; | |
236 | if (task == current) | |
237 | loadsegment(ds, task->thread.ds); | |
238 | break; | |
239 | case offsetof(struct user_regs_struct,es): | |
240 | task->thread.es = value; | |
241 | if (task == current) | |
242 | loadsegment(es, task->thread.es); | |
243 | break; | |
244 | ||
245 | /* | |
246 | * Can't actually change these in 64-bit mode. | |
247 | */ | |
248 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
249 | if (unlikely(value == 0)) |
250 | return -EIO; | |
2047b08b RM |
251 | #ifdef CONFIG_IA32_EMULATION |
252 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
253 | task_pt_regs(task)->cs = value; | |
2047b08b | 254 | #endif |
cb757c41 | 255 | break; |
2047b08b | 256 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
257 | if (unlikely(value == 0)) |
258 | return -EIO; | |
2047b08b RM |
259 | #ifdef CONFIG_IA32_EMULATION |
260 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
261 | task_pt_regs(task)->ss = value; | |
2047b08b | 262 | #endif |
cb757c41 | 263 | break; |
2047b08b RM |
264 | } |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static unsigned long debugreg_addr_limit(struct task_struct *task) | |
270 | { | |
271 | #ifdef CONFIG_IA32_EMULATION | |
272 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
273 | return IA32_PAGE_OFFSET - 3; | |
274 | #endif | |
d9517346 | 275 | return TASK_SIZE_MAX - 7; |
2047b08b RM |
276 | } |
277 | ||
278 | #endif /* CONFIG_X86_32 */ | |
279 | ||
06ee1b68 | 280 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 281 | { |
06ee1b68 RM |
282 | unsigned long retval = task_pt_regs(task)->flags; |
283 | ||
284 | /* | |
285 | * If the debugger set TF, hide it from the readout. | |
286 | */ | |
287 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
288 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 289 | |
1da177e4 LT |
290 | return retval; |
291 | } | |
292 | ||
06ee1b68 RM |
293 | static int set_flags(struct task_struct *task, unsigned long value) |
294 | { | |
295 | struct pt_regs *regs = task_pt_regs(task); | |
296 | ||
297 | /* | |
298 | * If the user value contains TF, mark that | |
299 | * it was not "us" (the debugger) that set it. | |
300 | * If not, make sure it stays set if we had. | |
301 | */ | |
302 | if (value & X86_EFLAGS_TF) | |
303 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
304 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
305 | value |= X86_EFLAGS_TF; | |
306 | ||
307 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static int putreg(struct task_struct *child, | |
313 | unsigned long offset, unsigned long value) | |
314 | { | |
315 | switch (offset) { | |
316 | case offsetof(struct user_regs_struct, cs): | |
317 | case offsetof(struct user_regs_struct, ds): | |
318 | case offsetof(struct user_regs_struct, es): | |
319 | case offsetof(struct user_regs_struct, fs): | |
320 | case offsetof(struct user_regs_struct, gs): | |
321 | case offsetof(struct user_regs_struct, ss): | |
322 | return set_segment_reg(child, offset, value); | |
323 | ||
324 | case offsetof(struct user_regs_struct, flags): | |
325 | return set_flags(child, value); | |
2047b08b RM |
326 | |
327 | #ifdef CONFIG_X86_64 | |
328 | case offsetof(struct user_regs_struct,fs_base): | |
329 | if (value >= TASK_SIZE_OF(child)) | |
330 | return -EIO; | |
331 | /* | |
332 | * When changing the segment base, use do_arch_prctl | |
333 | * to set either thread.fs or thread.fsindex and the | |
334 | * corresponding GDT slot. | |
335 | */ | |
336 | if (child->thread.fs != value) | |
337 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
338 | return 0; | |
339 | case offsetof(struct user_regs_struct,gs_base): | |
340 | /* | |
341 | * Exactly the same here as the %fs handling above. | |
342 | */ | |
343 | if (value >= TASK_SIZE_OF(child)) | |
344 | return -EIO; | |
345 | if (child->thread.gs != value) | |
346 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
347 | return 0; | |
348 | #endif | |
06ee1b68 RM |
349 | } |
350 | ||
351 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
356 | { | |
357 | switch (offset) { | |
358 | case offsetof(struct user_regs_struct, cs): | |
359 | case offsetof(struct user_regs_struct, ds): | |
360 | case offsetof(struct user_regs_struct, es): | |
361 | case offsetof(struct user_regs_struct, fs): | |
362 | case offsetof(struct user_regs_struct, gs): | |
363 | case offsetof(struct user_regs_struct, ss): | |
364 | return get_segment_reg(task, offset); | |
365 | ||
366 | case offsetof(struct user_regs_struct, flags): | |
367 | return get_flags(task); | |
2047b08b RM |
368 | |
369 | #ifdef CONFIG_X86_64 | |
370 | case offsetof(struct user_regs_struct, fs_base): { | |
371 | /* | |
372 | * do_arch_prctl may have used a GDT slot instead of | |
373 | * the MSR. To userland, it appears the same either | |
374 | * way, except the %fs segment selector might not be 0. | |
375 | */ | |
376 | unsigned int seg = task->thread.fsindex; | |
377 | if (task->thread.fs != 0) | |
378 | return task->thread.fs; | |
379 | if (task == current) | |
380 | asm("movl %%fs,%0" : "=r" (seg)); | |
381 | if (seg != FS_TLS_SEL) | |
382 | return 0; | |
383 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
384 | } | |
385 | case offsetof(struct user_regs_struct, gs_base): { | |
386 | /* | |
387 | * Exactly the same here as the %fs handling above. | |
388 | */ | |
389 | unsigned int seg = task->thread.gsindex; | |
390 | if (task->thread.gs != 0) | |
391 | return task->thread.gs; | |
392 | if (task == current) | |
393 | asm("movl %%gs,%0" : "=r" (seg)); | |
394 | if (seg != GS_TLS_SEL) | |
395 | return 0; | |
396 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
397 | } | |
398 | #endif | |
06ee1b68 RM |
399 | } |
400 | ||
401 | return *pt_regs_access(task_pt_regs(task), offset); | |
402 | } | |
403 | ||
91e7b707 RM |
404 | static int genregs_get(struct task_struct *target, |
405 | const struct user_regset *regset, | |
406 | unsigned int pos, unsigned int count, | |
407 | void *kbuf, void __user *ubuf) | |
408 | { | |
409 | if (kbuf) { | |
410 | unsigned long *k = kbuf; | |
411 | while (count > 0) { | |
412 | *k++ = getreg(target, pos); | |
413 | count -= sizeof(*k); | |
414 | pos += sizeof(*k); | |
415 | } | |
416 | } else { | |
417 | unsigned long __user *u = ubuf; | |
418 | while (count > 0) { | |
419 | if (__put_user(getreg(target, pos), u++)) | |
420 | return -EFAULT; | |
421 | count -= sizeof(*u); | |
422 | pos += sizeof(*u); | |
423 | } | |
424 | } | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static int genregs_set(struct task_struct *target, | |
430 | const struct user_regset *regset, | |
431 | unsigned int pos, unsigned int count, | |
432 | const void *kbuf, const void __user *ubuf) | |
433 | { | |
434 | int ret = 0; | |
435 | if (kbuf) { | |
436 | const unsigned long *k = kbuf; | |
437 | while (count > 0 && !ret) { | |
438 | ret = putreg(target, pos, *k++); | |
439 | count -= sizeof(*k); | |
440 | pos += sizeof(*k); | |
441 | } | |
442 | } else { | |
443 | const unsigned long __user *u = ubuf; | |
444 | while (count > 0 && !ret) { | |
445 | unsigned long word; | |
446 | ret = __get_user(word, u++); | |
447 | if (ret) | |
448 | break; | |
449 | ret = putreg(target, pos, word); | |
450 | count -= sizeof(*u); | |
451 | pos += sizeof(*u); | |
452 | } | |
453 | } | |
454 | return ret; | |
455 | } | |
456 | ||
d9771e8c RM |
457 | /* |
458 | * This function is trivial and will be inlined by the compiler. | |
459 | * Having it separates the implementation details of debug | |
460 | * registers from the interface details of ptrace. | |
461 | */ | |
462 | static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) | |
463 | { | |
0f534093 RM |
464 | switch (n) { |
465 | case 0: return child->thread.debugreg0; | |
466 | case 1: return child->thread.debugreg1; | |
467 | case 2: return child->thread.debugreg2; | |
468 | case 3: return child->thread.debugreg3; | |
469 | case 6: return child->thread.debugreg6; | |
470 | case 7: return child->thread.debugreg7; | |
471 | } | |
472 | return 0; | |
d9771e8c RM |
473 | } |
474 | ||
475 | static int ptrace_set_debugreg(struct task_struct *child, | |
476 | int n, unsigned long data) | |
477 | { | |
0f534093 RM |
478 | int i; |
479 | ||
d9771e8c RM |
480 | if (unlikely(n == 4 || n == 5)) |
481 | return -EIO; | |
482 | ||
2047b08b | 483 | if (n < 4 && unlikely(data >= debugreg_addr_limit(child))) |
d9771e8c RM |
484 | return -EIO; |
485 | ||
0f534093 RM |
486 | switch (n) { |
487 | case 0: child->thread.debugreg0 = data; break; | |
488 | case 1: child->thread.debugreg1 = data; break; | |
489 | case 2: child->thread.debugreg2 = data; break; | |
490 | case 3: child->thread.debugreg3 = data; break; | |
491 | ||
492 | case 6: | |
2047b08b RM |
493 | if ((data & ~0xffffffffUL) != 0) |
494 | return -EIO; | |
0f534093 RM |
495 | child->thread.debugreg6 = data; |
496 | break; | |
497 | ||
498 | case 7: | |
d9771e8c RM |
499 | /* |
500 | * Sanity-check data. Take one half-byte at once with | |
501 | * check = (val >> (16 + 4*i)) & 0xf. It contains the | |
502 | * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits | |
503 | * 2 and 3 are LENi. Given a list of invalid values, | |
504 | * we do mask |= 1 << invalid_value, so that | |
505 | * (mask >> check) & 1 is a correct test for invalid | |
506 | * values. | |
507 | * | |
508 | * R/Wi contains the type of the breakpoint / | |
509 | * watchpoint, LENi contains the length of the watched | |
510 | * data in the watchpoint case. | |
511 | * | |
512 | * The invalid values are: | |
2047b08b | 513 | * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit] |
d9771e8c RM |
514 | * - R/Wi == 0x10 (break on I/O reads or writes), so |
515 | * mask |= 0x4444. | |
516 | * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= | |
517 | * 0x1110. | |
518 | * | |
519 | * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. | |
520 | * | |
521 | * See the Intel Manual "System Programming Guide", | |
522 | * 15.2.4 | |
523 | * | |
524 | * Note that LENi == 0x10 is defined on x86_64 in long | |
525 | * mode (i.e. even for 32-bit userspace software, but | |
526 | * 64-bit kernel), so the x86_64 mask value is 0x5454. | |
527 | * See the AMD manual no. 24593 (AMD64 System Programming) | |
528 | */ | |
2047b08b RM |
529 | #ifdef CONFIG_X86_32 |
530 | #define DR7_MASK 0x5f54 | |
531 | #else | |
532 | #define DR7_MASK 0x5554 | |
533 | #endif | |
d9771e8c RM |
534 | data &= ~DR_CONTROL_RESERVED; |
535 | for (i = 0; i < 4; i++) | |
2047b08b | 536 | if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1) |
d9771e8c | 537 | return -EIO; |
0f534093 | 538 | child->thread.debugreg7 = data; |
d9771e8c RM |
539 | if (data) |
540 | set_tsk_thread_flag(child, TIF_DEBUG); | |
541 | else | |
542 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
0f534093 | 543 | break; |
d9771e8c RM |
544 | } |
545 | ||
d9771e8c RM |
546 | return 0; |
547 | } | |
548 | ||
325af5fb RM |
549 | /* |
550 | * These access the current or another (stopped) task's io permission | |
551 | * bitmap for debugging or core dump. | |
552 | */ | |
553 | static int ioperm_active(struct task_struct *target, | |
554 | const struct user_regset *regset) | |
555 | { | |
556 | return target->thread.io_bitmap_max / regset->size; | |
557 | } | |
b4ef95de | 558 | |
325af5fb RM |
559 | static int ioperm_get(struct task_struct *target, |
560 | const struct user_regset *regset, | |
561 | unsigned int pos, unsigned int count, | |
562 | void *kbuf, void __user *ubuf) | |
eee3af4a | 563 | { |
325af5fb | 564 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
565 | return -ENXIO; |
566 | ||
325af5fb RM |
567 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
568 | target->thread.io_bitmap_ptr, | |
569 | 0, IO_BITMAP_BYTES); | |
570 | } | |
571 | ||
93fa7636 | 572 | #ifdef CONFIG_X86_PTRACE_BTS |
e2b371f0 MM |
573 | /* |
574 | * A branch trace store context. | |
575 | * | |
576 | * Contexts may only be installed by ptrace_bts_config() and only for | |
577 | * ptraced tasks. | |
578 | * | |
579 | * Contexts are destroyed when the tracee is detached from the tracer. | |
580 | * The actual destruction work requires interrupts enabled, so the | |
581 | * work is deferred and will be scheduled during __ptrace_unlink(). | |
582 | * | |
583 | * Contexts hold an additional task_struct reference on the traced | |
584 | * task, as well as a reference on the tracer's mm. | |
585 | * | |
586 | * Ptrace already holds a task_struct for the duration of ptrace operations, | |
587 | * but since destruction is deferred, it may be executed after both | |
588 | * tracer and tracee exited. | |
589 | */ | |
590 | struct bts_context { | |
591 | /* The branch trace handle. */ | |
592 | struct bts_tracer *tracer; | |
593 | ||
594 | /* The buffer used to store the branch trace and its size. */ | |
595 | void *buffer; | |
596 | unsigned int size; | |
597 | ||
598 | /* The mm that paid for the above buffer. */ | |
599 | struct mm_struct *mm; | |
600 | ||
601 | /* The task this context belongs to. */ | |
602 | struct task_struct *task; | |
603 | ||
604 | /* The signal to send on a bts buffer overflow. */ | |
605 | unsigned int bts_ovfl_signal; | |
606 | ||
607 | /* The work struct to destroy a context. */ | |
608 | struct work_struct work; | |
609 | }; | |
610 | ||
1cb81b14 | 611 | static int alloc_bts_buffer(struct bts_context *context, unsigned int size) |
e2b371f0 | 612 | { |
1cb81b14 MM |
613 | void *buffer = NULL; |
614 | int err = -ENOMEM; | |
e2b371f0 | 615 | |
1cb81b14 MM |
616 | err = account_locked_memory(current->mm, current->signal->rlim, size); |
617 | if (err < 0) | |
618 | return err; | |
619 | ||
620 | buffer = kzalloc(size, GFP_KERNEL); | |
621 | if (!buffer) | |
622 | goto out_refund; | |
623 | ||
624 | context->buffer = buffer; | |
625 | context->size = size; | |
626 | context->mm = get_task_mm(current); | |
627 | ||
628 | return 0; | |
629 | ||
630 | out_refund: | |
631 | refund_locked_memory(current->mm, size); | |
632 | return err; | |
e2b371f0 MM |
633 | } |
634 | ||
635 | static inline void free_bts_buffer(struct bts_context *context) | |
636 | { | |
637 | if (!context->buffer) | |
638 | return; | |
639 | ||
640 | kfree(context->buffer); | |
641 | context->buffer = NULL; | |
642 | ||
1cb81b14 | 643 | refund_locked_memory(context->mm, context->size); |
e2b371f0 MM |
644 | context->size = 0; |
645 | ||
646 | mmput(context->mm); | |
647 | context->mm = NULL; | |
648 | } | |
649 | ||
650 | static void free_bts_context_work(struct work_struct *w) | |
651 | { | |
652 | struct bts_context *context; | |
653 | ||
654 | context = container_of(w, struct bts_context, work); | |
655 | ||
656 | ds_release_bts(context->tracer); | |
657 | put_task_struct(context->task); | |
658 | free_bts_buffer(context); | |
659 | kfree(context); | |
660 | } | |
661 | ||
662 | static inline void free_bts_context(struct bts_context *context) | |
663 | { | |
664 | INIT_WORK(&context->work, free_bts_context_work); | |
665 | schedule_work(&context->work); | |
666 | } | |
667 | ||
668 | static inline struct bts_context *alloc_bts_context(struct task_struct *task) | |
669 | { | |
670 | struct bts_context *context = kzalloc(sizeof(*context), GFP_KERNEL); | |
671 | if (context) { | |
672 | context->task = task; | |
673 | task->bts = context; | |
674 | ||
675 | get_task_struct(task); | |
676 | } | |
677 | ||
678 | return context; | |
679 | } | |
680 | ||
93fa7636 | 681 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
eee3af4a MM |
682 | struct bts_struct __user *out) |
683 | { | |
e2b371f0 | 684 | struct bts_context *context; |
c2724775 MM |
685 | const struct bts_trace *trace; |
686 | struct bts_struct bts; | |
687 | const unsigned char *at; | |
93fa7636 | 688 | int error; |
eee3af4a | 689 | |
e2b371f0 MM |
690 | context = child->bts; |
691 | if (!context) | |
692 | return -ESRCH; | |
693 | ||
694 | trace = ds_read_bts(context->tracer); | |
c2724775 | 695 | if (!trace) |
e2b371f0 | 696 | return -ESRCH; |
e4811f25 | 697 | |
c2724775 MM |
698 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
699 | if ((void *)at < trace->ds.begin) | |
700 | at += (trace->ds.n * trace->ds.size); | |
93fa7636 | 701 | |
c2724775 MM |
702 | if (!trace->read) |
703 | return -EOPNOTSUPP; | |
93fa7636 | 704 | |
e2b371f0 | 705 | error = trace->read(context->tracer, at, &bts); |
93fa7636 MM |
706 | if (error < 0) |
707 | return error; | |
e4811f25 | 708 | |
c2724775 | 709 | if (copy_to_user(out, &bts, sizeof(bts))) |
eee3af4a MM |
710 | return -EFAULT; |
711 | ||
c2724775 | 712 | return sizeof(bts); |
eee3af4a MM |
713 | } |
714 | ||
a95d67f8 | 715 | static int ptrace_bts_drain(struct task_struct *child, |
cba4b65d | 716 | long size, |
a95d67f8 MM |
717 | struct bts_struct __user *out) |
718 | { | |
e2b371f0 | 719 | struct bts_context *context; |
c2724775 MM |
720 | const struct bts_trace *trace; |
721 | const unsigned char *at; | |
722 | int error, drained = 0; | |
eee3af4a | 723 | |
e2b371f0 MM |
724 | context = child->bts; |
725 | if (!context) | |
726 | return -ESRCH; | |
727 | ||
728 | trace = ds_read_bts(context->tracer); | |
c2724775 | 729 | if (!trace) |
e2b371f0 | 730 | return -ESRCH; |
a95d67f8 | 731 | |
c2724775 MM |
732 | if (!trace->read) |
733 | return -EOPNOTSUPP; | |
734 | ||
735 | if (size < (trace->ds.top - trace->ds.begin)) | |
cba4b65d MM |
736 | return -EIO; |
737 | ||
c2724775 MM |
738 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
739 | out++, drained++, at += trace->ds.size) { | |
740 | struct bts_struct bts; | |
a95d67f8 | 741 | |
e2b371f0 | 742 | error = trace->read(context->tracer, at, &bts); |
c2724775 MM |
743 | if (error < 0) |
744 | return error; | |
a95d67f8 | 745 | |
c2724775 | 746 | if (copy_to_user(out, &bts, sizeof(bts))) |
a95d67f8 MM |
747 | return -EFAULT; |
748 | } | |
749 | ||
c2724775 MM |
750 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
751 | ||
e2b371f0 | 752 | error = ds_reset_bts(context->tracer); |
93fa7636 MM |
753 | if (error < 0) |
754 | return error; | |
a95d67f8 | 755 | |
c2724775 | 756 | return drained; |
a95d67f8 MM |
757 | } |
758 | ||
759 | static int ptrace_bts_config(struct task_struct *child, | |
cba4b65d | 760 | long cfg_size, |
a95d67f8 MM |
761 | const struct ptrace_bts_config __user *ucfg) |
762 | { | |
e2b371f0 | 763 | struct bts_context *context; |
a95d67f8 | 764 | struct ptrace_bts_config cfg; |
c2724775 | 765 | unsigned int flags = 0; |
a95d67f8 | 766 | |
cba4b65d | 767 | if (cfg_size < sizeof(cfg)) |
c2724775 | 768 | return -EIO; |
cba4b65d | 769 | |
a95d67f8 | 770 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
c2724775 | 771 | return -EFAULT; |
6abb11ae | 772 | |
e2b371f0 MM |
773 | context = child->bts; |
774 | if (!context) | |
775 | context = alloc_bts_context(child); | |
776 | if (!context) | |
777 | return -ENOMEM; | |
93fa7636 | 778 | |
c2724775 MM |
779 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
780 | if (!cfg.signal) | |
781 | return -EINVAL; | |
ca0002a1 | 782 | |
5a8ac9d2 | 783 | return -EOPNOTSUPP; |
e2b371f0 | 784 | context->bts_ovfl_signal = cfg.signal; |
c2724775 | 785 | } |
6abb11ae | 786 | |
e2b371f0 MM |
787 | ds_release_bts(context->tracer); |
788 | context->tracer = NULL; | |
6abb11ae | 789 | |
e2b371f0 | 790 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && (cfg.size != context->size)) { |
1cb81b14 MM |
791 | int err; |
792 | ||
e2b371f0 MM |
793 | free_bts_buffer(context); |
794 | if (!cfg.size) | |
795 | return 0; | |
c5dee617 | 796 | |
1cb81b14 MM |
797 | err = alloc_bts_buffer(context, cfg.size); |
798 | if (err < 0) | |
799 | return err; | |
a95d67f8 MM |
800 | } |
801 | ||
da35c371 | 802 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
c2724775 | 803 | flags |= BTS_USER; |
eee3af4a | 804 | |
da35c371 | 805 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
c2724775 | 806 | flags |= BTS_TIMESTAMPS; |
eee3af4a | 807 | |
de79f54f MM |
808 | context->tracer = |
809 | ds_request_bts_task(child, context->buffer, context->size, | |
810 | NULL, (size_t)-1, flags); | |
e2b371f0 MM |
811 | if (unlikely(IS_ERR(context->tracer))) { |
812 | int error = PTR_ERR(context->tracer); | |
da35c371 | 813 | |
e2b371f0 MM |
814 | free_bts_buffer(context); |
815 | context->tracer = NULL; | |
c2724775 MM |
816 | return error; |
817 | } | |
da35c371 | 818 | |
c2724775 | 819 | return sizeof(cfg); |
eee3af4a MM |
820 | } |
821 | ||
a95d67f8 | 822 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 823 | long cfg_size, |
a95d67f8 | 824 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 825 | { |
e2b371f0 | 826 | struct bts_context *context; |
c2724775 | 827 | const struct bts_trace *trace; |
a95d67f8 | 828 | struct ptrace_bts_config cfg; |
eee3af4a | 829 | |
e2b371f0 MM |
830 | context = child->bts; |
831 | if (!context) | |
832 | return -ESRCH; | |
833 | ||
cba4b65d MM |
834 | if (cfg_size < sizeof(cfg)) |
835 | return -EIO; | |
836 | ||
e2b371f0 | 837 | trace = ds_read_bts(context->tracer); |
c2724775 | 838 | if (!trace) |
e2b371f0 | 839 | return -ESRCH; |
eee3af4a | 840 | |
93fa7636 | 841 | memset(&cfg, 0, sizeof(cfg)); |
e2b371f0 MM |
842 | cfg.size = trace->ds.end - trace->ds.begin; |
843 | cfg.signal = context->bts_ovfl_signal; | |
844 | cfg.bts_size = sizeof(struct bts_struct); | |
eee3af4a | 845 | |
93fa7636 MM |
846 | if (cfg.signal) |
847 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 848 | |
c2724775 | 849 | if (trace->ds.flags & BTS_USER) |
93fa7636 MM |
850 | cfg.flags |= PTRACE_BTS_O_TRACE; |
851 | ||
c2724775 | 852 | if (trace->ds.flags & BTS_TIMESTAMPS) |
93fa7636 | 853 | cfg.flags |= PTRACE_BTS_O_SCHED; |
87e8407f | 854 | |
a95d67f8 MM |
855 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
856 | return -EFAULT; | |
eee3af4a | 857 | |
a95d67f8 | 858 | return sizeof(cfg); |
eee3af4a MM |
859 | } |
860 | ||
c2724775 | 861 | static int ptrace_bts_clear(struct task_struct *child) |
d8d4f157 | 862 | { |
e2b371f0 | 863 | struct bts_context *context; |
c2724775 | 864 | const struct bts_trace *trace; |
d8d4f157 | 865 | |
e2b371f0 MM |
866 | context = child->bts; |
867 | if (!context) | |
868 | return -ESRCH; | |
869 | ||
870 | trace = ds_read_bts(context->tracer); | |
c2724775 | 871 | if (!trace) |
e2b371f0 | 872 | return -ESRCH; |
d8d4f157 | 873 | |
c2724775 | 874 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
d8d4f157 | 875 | |
e2b371f0 | 876 | return ds_reset_bts(context->tracer); |
d8d4f157 AM |
877 | } |
878 | ||
c2724775 | 879 | static int ptrace_bts_size(struct task_struct *child) |
eee3af4a | 880 | { |
e2b371f0 | 881 | struct bts_context *context; |
c2724775 | 882 | const struct bts_trace *trace; |
93fa7636 | 883 | |
e2b371f0 MM |
884 | context = child->bts; |
885 | if (!context) | |
886 | return -ESRCH; | |
887 | ||
888 | trace = ds_read_bts(context->tracer); | |
c2724775 | 889 | if (!trace) |
e2b371f0 | 890 | return -ESRCH; |
93fa7636 | 891 | |
c2724775 | 892 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
93fa7636 | 893 | } |
bf53de90 | 894 | |
e2b371f0 MM |
895 | /* |
896 | * Called from __ptrace_unlink() after the child has been moved back | |
897 | * to its original parent. | |
898 | */ | |
0f481406 | 899 | void ptrace_bts_untrace(struct task_struct *child) |
bf53de90 MM |
900 | { |
901 | if (unlikely(child->bts)) { | |
e2b371f0 | 902 | free_bts_context(child->bts); |
bf53de90 | 903 | child->bts = NULL; |
bf53de90 MM |
904 | } |
905 | } | |
93fa7636 | 906 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 907 | |
1da177e4 LT |
908 | /* |
909 | * Called by kernel/ptrace.c when detaching.. | |
910 | * | |
911 | * Make sure the single step bit is not set. | |
912 | */ | |
913 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 914 | { |
7f232343 | 915 | user_disable_single_step(child); |
e9c86c78 | 916 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 917 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 918 | #endif |
1da177e4 LT |
919 | } |
920 | ||
5a4646a4 RM |
921 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
922 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
923 | #endif | |
924 | ||
481bed45 | 925 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 926 | { |
5a4646a4 | 927 | int ret; |
1da177e4 LT |
928 | unsigned long __user *datap = (unsigned long __user *)data; |
929 | ||
1da177e4 | 930 | switch (request) { |
1da177e4 LT |
931 | /* read the word at location addr in the USER area. */ |
932 | case PTRACE_PEEKUSR: { | |
933 | unsigned long tmp; | |
934 | ||
935 | ret = -EIO; | |
e9c86c78 RM |
936 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
937 | addr >= sizeof(struct user)) | |
1da177e4 LT |
938 | break; |
939 | ||
940 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 941 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 942 | tmp = getreg(child, addr); |
e9c86c78 RM |
943 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
944 | addr <= offsetof(struct user, u_debugreg[7])) { | |
945 | addr -= offsetof(struct user, u_debugreg[0]); | |
946 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
947 | } |
948 | ret = put_user(tmp, datap); | |
949 | break; | |
950 | } | |
951 | ||
1da177e4 LT |
952 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
953 | ret = -EIO; | |
e9c86c78 RM |
954 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
955 | addr >= sizeof(struct user)) | |
1da177e4 LT |
956 | break; |
957 | ||
e9c86c78 | 958 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 959 | ret = putreg(child, addr, data); |
e9c86c78 RM |
960 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
961 | addr <= offsetof(struct user, u_debugreg[7])) { | |
962 | addr -= offsetof(struct user, u_debugreg[0]); | |
963 | ret = ptrace_set_debugreg(child, | |
964 | addr / sizeof(data), data); | |
1da177e4 | 965 | } |
e9c86c78 | 966 | break; |
1da177e4 | 967 | |
5a4646a4 RM |
968 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
969 | return copy_regset_to_user(child, | |
970 | task_user_regset_view(current), | |
971 | REGSET_GENERAL, | |
972 | 0, sizeof(struct user_regs_struct), | |
973 | datap); | |
974 | ||
975 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
976 | return copy_regset_from_user(child, | |
977 | task_user_regset_view(current), | |
978 | REGSET_GENERAL, | |
979 | 0, sizeof(struct user_regs_struct), | |
980 | datap); | |
981 | ||
982 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
983 | return copy_regset_to_user(child, | |
984 | task_user_regset_view(current), | |
985 | REGSET_FP, | |
986 | 0, sizeof(struct user_i387_struct), | |
987 | datap); | |
988 | ||
989 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
990 | return copy_regset_from_user(child, | |
991 | task_user_regset_view(current), | |
992 | REGSET_FP, | |
993 | 0, sizeof(struct user_i387_struct), | |
994 | datap); | |
1da177e4 | 995 | |
e9c86c78 | 996 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
997 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
998 | return copy_regset_to_user(child, &user_x86_32_view, | |
999 | REGSET_XFP, | |
1000 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1001 | datap) ? -EIO : 0; |
5a4646a4 RM |
1002 | |
1003 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1004 | return copy_regset_from_user(child, &user_x86_32_view, | |
1005 | REGSET_XFP, | |
1006 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 1007 | datap) ? -EIO : 0; |
e9c86c78 | 1008 | #endif |
1da177e4 | 1009 | |
e9c86c78 | 1010 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 1011 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
1012 | if (addr < 0) |
1013 | return -EIO; | |
1014 | ret = do_get_thread_area(child, addr, | |
1015 | (struct user_desc __user *) data); | |
1da177e4 LT |
1016 | break; |
1017 | ||
1018 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
1019 | if (addr < 0) |
1020 | return -EIO; | |
1021 | ret = do_set_thread_area(child, addr, | |
1022 | (struct user_desc __user *) data, 0); | |
1da177e4 | 1023 | break; |
e9c86c78 RM |
1024 | #endif |
1025 | ||
1026 | #ifdef CONFIG_X86_64 | |
1027 | /* normal 64bit interface to access TLS data. | |
1028 | Works just like arch_prctl, except that the arguments | |
1029 | are reversed. */ | |
1030 | case PTRACE_ARCH_PRCTL: | |
1031 | ret = do_arch_prctl(child, data, addr); | |
1032 | break; | |
1033 | #endif | |
1da177e4 | 1034 | |
b4ef95de IM |
1035 | /* |
1036 | * These bits need more cooking - not enabled yet: | |
1037 | */ | |
93fa7636 | 1038 | #ifdef CONFIG_X86_PTRACE_BTS |
a95d67f8 MM |
1039 | case PTRACE_BTS_CONFIG: |
1040 | ret = ptrace_bts_config | |
cba4b65d | 1041 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1042 | break; |
1043 | ||
a95d67f8 MM |
1044 | case PTRACE_BTS_STATUS: |
1045 | ret = ptrace_bts_status | |
cba4b65d | 1046 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
1047 | break; |
1048 | ||
c2724775 MM |
1049 | case PTRACE_BTS_SIZE: |
1050 | ret = ptrace_bts_size(child); | |
eee3af4a MM |
1051 | break; |
1052 | ||
a95d67f8 | 1053 | case PTRACE_BTS_GET: |
eee3af4a | 1054 | ret = ptrace_bts_read_record |
a95d67f8 | 1055 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
1056 | break; |
1057 | ||
a95d67f8 | 1058 | case PTRACE_BTS_CLEAR: |
c2724775 | 1059 | ret = ptrace_bts_clear(child); |
eee3af4a MM |
1060 | break; |
1061 | ||
a95d67f8 MM |
1062 | case PTRACE_BTS_DRAIN: |
1063 | ret = ptrace_bts_drain | |
cba4b65d | 1064 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 1065 | break; |
93fa7636 | 1066 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 1067 | |
1da177e4 LT |
1068 | default: |
1069 | ret = ptrace_request(child, request, addr, data); | |
1070 | break; | |
1071 | } | |
d9771e8c | 1072 | |
1da177e4 LT |
1073 | return ret; |
1074 | } | |
1075 | ||
cb757c41 RM |
1076 | #ifdef CONFIG_IA32_EMULATION |
1077 | ||
099cd6e9 RM |
1078 | #include <linux/compat.h> |
1079 | #include <linux/syscalls.h> | |
1080 | #include <asm/ia32.h> | |
cb757c41 RM |
1081 | #include <asm/user32.h> |
1082 | ||
1083 | #define R32(l,q) \ | |
1084 | case offsetof(struct user32, regs.l): \ | |
1085 | regs->q = value; break | |
1086 | ||
1087 | #define SEG32(rs) \ | |
1088 | case offsetof(struct user32, regs.rs): \ | |
1089 | return set_segment_reg(child, \ | |
1090 | offsetof(struct user_regs_struct, rs), \ | |
1091 | value); \ | |
1092 | break | |
1093 | ||
1094 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1095 | { | |
1096 | struct pt_regs *regs = task_pt_regs(child); | |
1097 | ||
1098 | switch (regno) { | |
1099 | ||
1100 | SEG32(cs); | |
1101 | SEG32(ds); | |
1102 | SEG32(es); | |
1103 | SEG32(fs); | |
1104 | SEG32(gs); | |
1105 | SEG32(ss); | |
1106 | ||
1107 | R32(ebx, bx); | |
1108 | R32(ecx, cx); | |
1109 | R32(edx, dx); | |
1110 | R32(edi, di); | |
1111 | R32(esi, si); | |
1112 | R32(ebp, bp); | |
1113 | R32(eax, ax); | |
08ff18e2 | 1114 | R32(orig_eax, orig_ax); |
cb757c41 RM |
1115 | R32(eip, ip); |
1116 | R32(esp, sp); | |
1117 | ||
1118 | case offsetof(struct user32, regs.eflags): | |
1119 | return set_flags(child, value); | |
1120 | ||
1121 | case offsetof(struct user32, u_debugreg[0]) ... | |
1122 | offsetof(struct user32, u_debugreg[7]): | |
1123 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1124 | return ptrace_set_debugreg(child, regno / 4, value); | |
1125 | ||
1126 | default: | |
1127 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1128 | return -EIO; | |
1129 | ||
1130 | /* | |
1131 | * Other dummy fields in the virtual user structure | |
1132 | * are ignored | |
1133 | */ | |
1134 | break; | |
1135 | } | |
1136 | return 0; | |
1137 | } | |
1138 | ||
1139 | #undef R32 | |
1140 | #undef SEG32 | |
1141 | ||
1142 | #define R32(l,q) \ | |
1143 | case offsetof(struct user32, regs.l): \ | |
1144 | *val = regs->q; break | |
1145 | ||
1146 | #define SEG32(rs) \ | |
1147 | case offsetof(struct user32, regs.rs): \ | |
1148 | *val = get_segment_reg(child, \ | |
1149 | offsetof(struct user_regs_struct, rs)); \ | |
1150 | break | |
1151 | ||
1152 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1153 | { | |
1154 | struct pt_regs *regs = task_pt_regs(child); | |
1155 | ||
1156 | switch (regno) { | |
1157 | ||
1158 | SEG32(ds); | |
1159 | SEG32(es); | |
1160 | SEG32(fs); | |
1161 | SEG32(gs); | |
1162 | ||
1163 | R32(cs, cs); | |
1164 | R32(ss, ss); | |
1165 | R32(ebx, bx); | |
1166 | R32(ecx, cx); | |
1167 | R32(edx, dx); | |
1168 | R32(edi, di); | |
1169 | R32(esi, si); | |
1170 | R32(ebp, bp); | |
1171 | R32(eax, ax); | |
1172 | R32(orig_eax, orig_ax); | |
1173 | R32(eip, ip); | |
1174 | R32(esp, sp); | |
1175 | ||
1176 | case offsetof(struct user32, regs.eflags): | |
1177 | *val = get_flags(child); | |
1178 | break; | |
1179 | ||
1180 | case offsetof(struct user32, u_debugreg[0]) ... | |
1181 | offsetof(struct user32, u_debugreg[7]): | |
1182 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1183 | *val = ptrace_get_debugreg(child, regno / 4); | |
1184 | break; | |
1185 | ||
1186 | default: | |
1187 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1188 | return -EIO; | |
1189 | ||
1190 | /* | |
1191 | * Other dummy fields in the virtual user structure | |
1192 | * are ignored | |
1193 | */ | |
1194 | *val = 0; | |
1195 | break; | |
1196 | } | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | #undef R32 | |
1201 | #undef SEG32 | |
1202 | ||
91e7b707 RM |
1203 | static int genregs32_get(struct task_struct *target, |
1204 | const struct user_regset *regset, | |
1205 | unsigned int pos, unsigned int count, | |
1206 | void *kbuf, void __user *ubuf) | |
1207 | { | |
1208 | if (kbuf) { | |
1209 | compat_ulong_t *k = kbuf; | |
1210 | while (count > 0) { | |
1211 | getreg32(target, pos, k++); | |
1212 | count -= sizeof(*k); | |
1213 | pos += sizeof(*k); | |
1214 | } | |
1215 | } else { | |
1216 | compat_ulong_t __user *u = ubuf; | |
1217 | while (count > 0) { | |
1218 | compat_ulong_t word; | |
1219 | getreg32(target, pos, &word); | |
1220 | if (__put_user(word, u++)) | |
1221 | return -EFAULT; | |
1222 | count -= sizeof(*u); | |
1223 | pos += sizeof(*u); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | static int genregs32_set(struct task_struct *target, | |
1231 | const struct user_regset *regset, | |
1232 | unsigned int pos, unsigned int count, | |
1233 | const void *kbuf, const void __user *ubuf) | |
1234 | { | |
1235 | int ret = 0; | |
1236 | if (kbuf) { | |
1237 | const compat_ulong_t *k = kbuf; | |
1238 | while (count > 0 && !ret) { | |
f9cb02b0 | 1239 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1240 | count -= sizeof(*k); |
1241 | pos += sizeof(*k); | |
1242 | } | |
1243 | } else { | |
1244 | const compat_ulong_t __user *u = ubuf; | |
1245 | while (count > 0 && !ret) { | |
1246 | compat_ulong_t word; | |
1247 | ret = __get_user(word, u++); | |
1248 | if (ret) | |
1249 | break; | |
f9cb02b0 | 1250 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1251 | count -= sizeof(*u); |
1252 | pos += sizeof(*u); | |
1253 | } | |
1254 | } | |
1255 | return ret; | |
1256 | } | |
1257 | ||
562b80ba RM |
1258 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1259 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1260 | { |
562b80ba RM |
1261 | unsigned long addr = caddr; |
1262 | unsigned long data = cdata; | |
099cd6e9 RM |
1263 | void __user *datap = compat_ptr(data); |
1264 | int ret; | |
1265 | __u32 val; | |
1266 | ||
099cd6e9 | 1267 | switch (request) { |
099cd6e9 RM |
1268 | case PTRACE_PEEKUSR: |
1269 | ret = getreg32(child, addr, &val); | |
1270 | if (ret == 0) | |
1271 | ret = put_user(val, (__u32 __user *)datap); | |
1272 | break; | |
1273 | ||
1274 | case PTRACE_POKEUSR: | |
1275 | ret = putreg32(child, addr, data); | |
1276 | break; | |
1277 | ||
5a4646a4 RM |
1278 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1279 | return copy_regset_to_user(child, &user_x86_32_view, | |
1280 | REGSET_GENERAL, | |
1281 | 0, sizeof(struct user_regs_struct32), | |
1282 | datap); | |
1283 | ||
1284 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1285 | return copy_regset_from_user(child, &user_x86_32_view, | |
1286 | REGSET_GENERAL, 0, | |
1287 | sizeof(struct user_regs_struct32), | |
1288 | datap); | |
1289 | ||
1290 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1291 | return copy_regset_to_user(child, &user_x86_32_view, | |
1292 | REGSET_FP, 0, | |
1293 | sizeof(struct user_i387_ia32_struct), | |
1294 | datap); | |
1295 | ||
1296 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1297 | return copy_regset_from_user( | |
1298 | child, &user_x86_32_view, REGSET_FP, | |
1299 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1300 | ||
1301 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1302 | return copy_regset_to_user(child, &user_x86_32_view, | |
1303 | REGSET_XFP, 0, | |
1304 | sizeof(struct user32_fxsr_struct), | |
1305 | datap); | |
1306 | ||
1307 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1308 | return copy_regset_from_user(child, &user_x86_32_view, | |
1309 | REGSET_XFP, 0, | |
1310 | sizeof(struct user32_fxsr_struct), | |
1311 | datap); | |
099cd6e9 | 1312 | |
562b80ba RM |
1313 | case PTRACE_GET_THREAD_AREA: |
1314 | case PTRACE_SET_THREAD_AREA: | |
c2724775 MM |
1315 | #ifdef CONFIG_X86_PTRACE_BTS |
1316 | case PTRACE_BTS_CONFIG: | |
1317 | case PTRACE_BTS_STATUS: | |
1318 | case PTRACE_BTS_SIZE: | |
1319 | case PTRACE_BTS_GET: | |
1320 | case PTRACE_BTS_CLEAR: | |
1321 | case PTRACE_BTS_DRAIN: | |
1322 | #endif /* CONFIG_X86_PTRACE_BTS */ | |
562b80ba RM |
1323 | return arch_ptrace(child, request, addr, data); |
1324 | ||
099cd6e9 | 1325 | default: |
fdadd54d | 1326 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1327 | } |
1328 | ||
099cd6e9 RM |
1329 | return ret; |
1330 | } | |
1331 | ||
cb757c41 RM |
1332 | #endif /* CONFIG_IA32_EMULATION */ |
1333 | ||
070459d9 RM |
1334 | #ifdef CONFIG_X86_64 |
1335 | ||
1336 | static const struct user_regset x86_64_regsets[] = { | |
1337 | [REGSET_GENERAL] = { | |
1338 | .core_note_type = NT_PRSTATUS, | |
1339 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1340 | .size = sizeof(long), .align = sizeof(long), | |
1341 | .get = genregs_get, .set = genregs_set | |
1342 | }, | |
1343 | [REGSET_FP] = { | |
1344 | .core_note_type = NT_PRFPREG, | |
1345 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1346 | .size = sizeof(long), .align = sizeof(long), | |
1347 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1348 | }, | |
325af5fb RM |
1349 | [REGSET_IOPERM64] = { |
1350 | .core_note_type = NT_386_IOPERM, | |
1351 | .n = IO_BITMAP_LONGS, | |
1352 | .size = sizeof(long), .align = sizeof(long), | |
1353 | .active = ioperm_active, .get = ioperm_get | |
1354 | }, | |
070459d9 RM |
1355 | }; |
1356 | ||
1357 | static const struct user_regset_view user_x86_64_view = { | |
1358 | .name = "x86_64", .e_machine = EM_X86_64, | |
1359 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1360 | }; | |
1361 | ||
1362 | #else /* CONFIG_X86_32 */ | |
1363 | ||
1364 | #define user_regs_struct32 user_regs_struct | |
1365 | #define genregs32_get genregs_get | |
1366 | #define genregs32_set genregs_set | |
1367 | ||
1f465f4e RM |
1368 | #define user_i387_ia32_struct user_i387_struct |
1369 | #define user32_fxsr_struct user_fxsr_struct | |
1370 | ||
070459d9 RM |
1371 | #endif /* CONFIG_X86_64 */ |
1372 | ||
1373 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1374 | static const struct user_regset x86_32_regsets[] = { | |
1375 | [REGSET_GENERAL] = { | |
1376 | .core_note_type = NT_PRSTATUS, | |
1377 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1378 | .size = sizeof(u32), .align = sizeof(u32), | |
1379 | .get = genregs32_get, .set = genregs32_set | |
1380 | }, | |
1381 | [REGSET_FP] = { | |
1382 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1383 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1384 | .size = sizeof(u32), .align = sizeof(u32), |
1385 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1386 | }, | |
1387 | [REGSET_XFP] = { | |
1388 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1389 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1390 | .size = sizeof(u32), .align = sizeof(u32), |
1391 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1392 | }, | |
1393 | [REGSET_TLS] = { | |
bb61682b | 1394 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1395 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1396 | .size = sizeof(struct user_desc), | |
1397 | .align = sizeof(struct user_desc), | |
1398 | .active = regset_tls_active, | |
1399 | .get = regset_tls_get, .set = regset_tls_set | |
1400 | }, | |
325af5fb RM |
1401 | [REGSET_IOPERM32] = { |
1402 | .core_note_type = NT_386_IOPERM, | |
1403 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1404 | .size = sizeof(u32), .align = sizeof(u32), | |
1405 | .active = ioperm_active, .get = ioperm_get | |
1406 | }, | |
070459d9 RM |
1407 | }; |
1408 | ||
1409 | static const struct user_regset_view user_x86_32_view = { | |
1410 | .name = "i386", .e_machine = EM_386, | |
1411 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1412 | }; | |
1413 | #endif | |
1414 | ||
1415 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1416 | { | |
1417 | #ifdef CONFIG_IA32_EMULATION | |
1418 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1419 | #endif | |
1420 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1421 | return &user_x86_32_view; | |
1422 | #endif | |
1423 | #ifdef CONFIG_X86_64 | |
1424 | return &user_x86_64_view; | |
1425 | #endif | |
1426 | } | |
1427 | ||
da654b74 SD |
1428 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1429 | int error_code, int si_code) | |
1da177e4 LT |
1430 | { |
1431 | struct siginfo info; | |
1432 | ||
1433 | tsk->thread.trap_no = 1; | |
1434 | tsk->thread.error_code = error_code; | |
1435 | ||
1436 | memset(&info, 0, sizeof(info)); | |
1437 | info.si_signo = SIGTRAP; | |
da654b74 | 1438 | info.si_code = si_code; |
1da177e4 | 1439 | |
65ea5b03 PA |
1440 | /* User-mode ip? */ |
1441 | info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; | |
1da177e4 | 1442 | |
27b46d76 | 1443 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1444 | force_sig_info(SIGTRAP, &info, tsk); |
1445 | } | |
1446 | ||
86976cd8 | 1447 | |
d4d67150 RM |
1448 | #ifdef CONFIG_X86_32 |
1449 | # define IS_IA32 1 | |
1450 | #elif defined CONFIG_IA32_EMULATION | |
ccbe495c | 1451 | # define IS_IA32 is_compat_task() |
d4d67150 RM |
1452 | #else |
1453 | # define IS_IA32 0 | |
1454 | #endif | |
1455 | ||
1456 | /* | |
1457 | * We must return the syscall number to actually look up in the table. | |
1458 | * This can be -1L to skip running any syscall at all. | |
1459 | */ | |
1460 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1461 | { |
d4d67150 RM |
1462 | long ret = 0; |
1463 | ||
380fdd75 RM |
1464 | /* |
1465 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1466 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1467 | * If user-mode had set TF itself, then it's still clear from | |
1468 | * do_debug() and we need to set it again to restore the user | |
1469 | * state. If we entered on the slow path, TF was already set. | |
1470 | */ | |
1471 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1472 | regs->flags |= X86_EFLAGS_TF; | |
1473 | ||
86976cd8 RM |
1474 | /* do the secure computing check first */ |
1475 | secure_computing(regs->orig_ax); | |
1476 | ||
d4d67150 RM |
1477 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1478 | ret = -1L; | |
1479 | ||
eeea3c3f RM |
1480 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1481 | tracehook_report_syscall_entry(regs)) | |
1482 | ret = -1L; | |
86976cd8 | 1483 | |
66700001 | 1484 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1485 | trace_sys_enter(regs, regs->orig_ax); |
1b3fa2ce | 1486 | |
86976cd8 | 1487 | if (unlikely(current->audit_context)) { |
d4d67150 | 1488 | if (IS_IA32) |
86976cd8 RM |
1489 | audit_syscall_entry(AUDIT_ARCH_I386, |
1490 | regs->orig_ax, | |
1491 | regs->bx, regs->cx, | |
1492 | regs->dx, regs->si); | |
d4d67150 RM |
1493 | #ifdef CONFIG_X86_64 |
1494 | else | |
86976cd8 RM |
1495 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1496 | regs->orig_ax, | |
1497 | regs->di, regs->si, | |
1498 | regs->dx, regs->r10); | |
d4d67150 | 1499 | #endif |
86976cd8 | 1500 | } |
d4d67150 RM |
1501 | |
1502 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1503 | } |
1504 | ||
d4d67150 | 1505 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 RM |
1506 | { |
1507 | if (unlikely(current->audit_context)) | |
1508 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1509 | ||
66700001 | 1510 | if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) |
1c569f02 | 1511 | trace_sys_exit(regs, regs->ax); |
1b3fa2ce | 1512 | |
d4d67150 | 1513 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
eeea3c3f | 1514 | tracehook_report_syscall_exit(regs, 0); |
86976cd8 | 1515 | |
d4d67150 RM |
1516 | /* |
1517 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1518 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1519 | * We already reported this syscall instruction in | |
1520 | * syscall_trace_enter(), so don't do any more now. | |
1521 | */ | |
1522 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) | |
1523 | return; | |
1524 | ||
1525 | /* | |
1526 | * If we are single-stepping, synthesize a trap to follow the | |
1527 | * system call instruction. | |
1528 | */ | |
1529 | if (test_thread_flag(TIF_SINGLESTEP) && | |
43918f2b | 1530 | tracehook_consider_fatal_signal(current, SIGTRAP)) |
da654b74 | 1531 | send_sigtrap(current, regs, 0, TRAP_BRKPT); |
d4d67150 | 1532 | } |