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> |
1da177e4 LT |
24 | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/system.h> | |
28 | #include <asm/processor.h> | |
29 | #include <asm/i387.h> | |
30 | #include <asm/debugreg.h> | |
31 | #include <asm/ldt.h> | |
32 | #include <asm/desc.h> | |
2047b08b RM |
33 | #include <asm/prctl.h> |
34 | #include <asm/proto.h> | |
eee3af4a MM |
35 | #include <asm/ds.h> |
36 | ||
070459d9 RM |
37 | #include "tls.h" |
38 | ||
39 | enum x86_regset { | |
40 | REGSET_GENERAL, | |
41 | REGSET_FP, | |
42 | REGSET_XFP, | |
325af5fb | 43 | REGSET_IOPERM64 = REGSET_XFP, |
070459d9 | 44 | REGSET_TLS, |
325af5fb | 45 | REGSET_IOPERM32, |
070459d9 | 46 | }; |
eee3af4a | 47 | |
1da177e4 LT |
48 | /* |
49 | * does not yet catch signals sent when the child dies. | |
50 | * in exit.c or in signal.c. | |
51 | */ | |
52 | ||
9f155b98 CE |
53 | /* |
54 | * Determines which flags the user has access to [1 = access, 0 = no access]. | |
9f155b98 | 55 | */ |
e39c2891 RM |
56 | #define FLAG_MASK_32 ((unsigned long) \ |
57 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ | |
58 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ | |
59 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ | |
60 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ | |
61 | X86_EFLAGS_RF | X86_EFLAGS_AC)) | |
62 | ||
2047b08b RM |
63 | /* |
64 | * Determines whether a value may be installed in a segment register. | |
65 | */ | |
66 | static inline bool invalid_selector(u16 value) | |
67 | { | |
68 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); | |
69 | } | |
70 | ||
71 | #ifdef CONFIG_X86_32 | |
72 | ||
e39c2891 | 73 | #define FLAG_MASK FLAG_MASK_32 |
1da177e4 | 74 | |
4fe702c7 | 75 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
1da177e4 | 76 | { |
65ea5b03 | 77 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
06ee1b68 | 78 | regno >>= 2; |
62a97d44 RM |
79 | if (regno > FS) |
80 | --regno; | |
65ea5b03 | 81 | return ®s->bx + regno; |
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 { | |
93 | retval = task->thread.gs; | |
94 | if (task == current) | |
95 | savesegment(gs, retval); | |
96 | } | |
97 | return retval; | |
98 | } | |
99 | ||
100 | static int set_segment_reg(struct task_struct *task, | |
101 | unsigned long offset, u16 value) | |
102 | { | |
103 | /* | |
104 | * The value argument was already truncated to 16 bits. | |
105 | */ | |
2047b08b | 106 | if (invalid_selector(value)) |
06ee1b68 RM |
107 | return -EIO; |
108 | ||
c63855d0 RM |
109 | /* |
110 | * For %cs and %ss we cannot permit a null selector. | |
111 | * We can permit a bogus selector as long as it has USER_RPL. | |
112 | * Null selectors are fine for other segment registers, but | |
113 | * we will never get back to user mode with invalid %cs or %ss | |
114 | * and will take the trap in iret instead. Much code relies | |
115 | * on user_mode() to distinguish a user trap frame (which can | |
116 | * safely use invalid selectors) from a kernel trap frame. | |
117 | */ | |
118 | switch (offset) { | |
119 | case offsetof(struct user_regs_struct, cs): | |
120 | case offsetof(struct user_regs_struct, ss): | |
121 | if (unlikely(value == 0)) | |
122 | return -EIO; | |
123 | ||
124 | default: | |
06ee1b68 | 125 | *pt_regs_access(task_pt_regs(task), offset) = value; |
c63855d0 RM |
126 | break; |
127 | ||
128 | case offsetof(struct user_regs_struct, gs): | |
06ee1b68 RM |
129 | task->thread.gs = value; |
130 | if (task == current) | |
5fd4d16b RM |
131 | /* |
132 | * The user-mode %gs is not affected by | |
133 | * kernel entry, so we must update the CPU. | |
134 | */ | |
135 | loadsegment(gs, value); | |
1da177e4 | 136 | } |
06ee1b68 | 137 | |
1da177e4 LT |
138 | return 0; |
139 | } | |
140 | ||
2047b08b RM |
141 | static unsigned long debugreg_addr_limit(struct task_struct *task) |
142 | { | |
143 | return TASK_SIZE - 3; | |
144 | } | |
145 | ||
146 | #else /* CONFIG_X86_64 */ | |
147 | ||
148 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) | |
149 | ||
150 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) | |
151 | { | |
152 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); | |
153 | return ®s->r15 + (offset / sizeof(regs->r15)); | |
154 | } | |
155 | ||
156 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) | |
157 | { | |
158 | /* | |
159 | * Returning the value truncates it to 16 bits. | |
160 | */ | |
161 | unsigned int seg; | |
162 | ||
163 | switch (offset) { | |
164 | case offsetof(struct user_regs_struct, fs): | |
165 | if (task == current) { | |
166 | /* Older gas can't assemble movq %?s,%r?? */ | |
167 | asm("movl %%fs,%0" : "=r" (seg)); | |
168 | return seg; | |
169 | } | |
170 | return task->thread.fsindex; | |
171 | case offsetof(struct user_regs_struct, gs): | |
172 | if (task == current) { | |
173 | asm("movl %%gs,%0" : "=r" (seg)); | |
174 | return seg; | |
175 | } | |
176 | return task->thread.gsindex; | |
177 | case offsetof(struct user_regs_struct, ds): | |
178 | if (task == current) { | |
179 | asm("movl %%ds,%0" : "=r" (seg)); | |
180 | return seg; | |
181 | } | |
182 | return task->thread.ds; | |
183 | case offsetof(struct user_regs_struct, es): | |
184 | if (task == current) { | |
185 | asm("movl %%es,%0" : "=r" (seg)); | |
186 | return seg; | |
187 | } | |
188 | return task->thread.es; | |
189 | ||
190 | case offsetof(struct user_regs_struct, cs): | |
191 | case offsetof(struct user_regs_struct, ss): | |
192 | break; | |
193 | } | |
194 | return *pt_regs_access(task_pt_regs(task), offset); | |
195 | } | |
196 | ||
197 | static int set_segment_reg(struct task_struct *task, | |
198 | unsigned long offset, u16 value) | |
199 | { | |
200 | /* | |
201 | * The value argument was already truncated to 16 bits. | |
202 | */ | |
203 | if (invalid_selector(value)) | |
204 | return -EIO; | |
205 | ||
206 | switch (offset) { | |
207 | case offsetof(struct user_regs_struct,fs): | |
208 | /* | |
209 | * If this is setting fs as for normal 64-bit use but | |
210 | * setting fs_base has implicitly changed it, leave it. | |
211 | */ | |
212 | if ((value == FS_TLS_SEL && task->thread.fsindex == 0 && | |
213 | task->thread.fs != 0) || | |
214 | (value == 0 && task->thread.fsindex == FS_TLS_SEL && | |
215 | task->thread.fs == 0)) | |
216 | break; | |
217 | task->thread.fsindex = value; | |
218 | if (task == current) | |
219 | loadsegment(fs, task->thread.fsindex); | |
220 | break; | |
221 | case offsetof(struct user_regs_struct,gs): | |
222 | /* | |
223 | * If this is setting gs as for normal 64-bit use but | |
224 | * setting gs_base has implicitly changed it, leave it. | |
225 | */ | |
226 | if ((value == GS_TLS_SEL && task->thread.gsindex == 0 && | |
227 | task->thread.gs != 0) || | |
228 | (value == 0 && task->thread.gsindex == GS_TLS_SEL && | |
229 | task->thread.gs == 0)) | |
230 | break; | |
231 | task->thread.gsindex = value; | |
232 | if (task == current) | |
233 | load_gs_index(task->thread.gsindex); | |
234 | break; | |
235 | case offsetof(struct user_regs_struct,ds): | |
236 | task->thread.ds = value; | |
237 | if (task == current) | |
238 | loadsegment(ds, task->thread.ds); | |
239 | break; | |
240 | case offsetof(struct user_regs_struct,es): | |
241 | task->thread.es = value; | |
242 | if (task == current) | |
243 | loadsegment(es, task->thread.es); | |
244 | break; | |
245 | ||
246 | /* | |
247 | * Can't actually change these in 64-bit mode. | |
248 | */ | |
249 | case offsetof(struct user_regs_struct,cs): | |
c63855d0 RM |
250 | if (unlikely(value == 0)) |
251 | return -EIO; | |
2047b08b RM |
252 | #ifdef CONFIG_IA32_EMULATION |
253 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
254 | task_pt_regs(task)->cs = value; | |
2047b08b | 255 | #endif |
cb757c41 | 256 | break; |
2047b08b | 257 | case offsetof(struct user_regs_struct,ss): |
c63855d0 RM |
258 | if (unlikely(value == 0)) |
259 | return -EIO; | |
2047b08b RM |
260 | #ifdef CONFIG_IA32_EMULATION |
261 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
262 | task_pt_regs(task)->ss = value; | |
2047b08b | 263 | #endif |
cb757c41 | 264 | break; |
2047b08b RM |
265 | } |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static unsigned long debugreg_addr_limit(struct task_struct *task) | |
271 | { | |
272 | #ifdef CONFIG_IA32_EMULATION | |
273 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
274 | return IA32_PAGE_OFFSET - 3; | |
275 | #endif | |
276 | return TASK_SIZE64 - 7; | |
277 | } | |
278 | ||
279 | #endif /* CONFIG_X86_32 */ | |
280 | ||
06ee1b68 | 281 | static unsigned long get_flags(struct task_struct *task) |
1da177e4 | 282 | { |
06ee1b68 RM |
283 | unsigned long retval = task_pt_regs(task)->flags; |
284 | ||
285 | /* | |
286 | * If the debugger set TF, hide it from the readout. | |
287 | */ | |
288 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
289 | retval &= ~X86_EFLAGS_TF; | |
1da177e4 | 290 | |
1da177e4 LT |
291 | return retval; |
292 | } | |
293 | ||
06ee1b68 RM |
294 | static int set_flags(struct task_struct *task, unsigned long value) |
295 | { | |
296 | struct pt_regs *regs = task_pt_regs(task); | |
297 | ||
298 | /* | |
299 | * If the user value contains TF, mark that | |
300 | * it was not "us" (the debugger) that set it. | |
301 | * If not, make sure it stays set if we had. | |
302 | */ | |
303 | if (value & X86_EFLAGS_TF) | |
304 | clear_tsk_thread_flag(task, TIF_FORCED_TF); | |
305 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) | |
306 | value |= X86_EFLAGS_TF; | |
307 | ||
308 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static int putreg(struct task_struct *child, | |
314 | unsigned long offset, unsigned long value) | |
315 | { | |
316 | switch (offset) { | |
317 | case offsetof(struct user_regs_struct, cs): | |
318 | case offsetof(struct user_regs_struct, ds): | |
319 | case offsetof(struct user_regs_struct, es): | |
320 | case offsetof(struct user_regs_struct, fs): | |
321 | case offsetof(struct user_regs_struct, gs): | |
322 | case offsetof(struct user_regs_struct, ss): | |
323 | return set_segment_reg(child, offset, value); | |
324 | ||
325 | case offsetof(struct user_regs_struct, flags): | |
326 | return set_flags(child, value); | |
2047b08b RM |
327 | |
328 | #ifdef CONFIG_X86_64 | |
84c6f604 RM |
329 | /* |
330 | * Orig_ax is really just a flag with small positive and | |
331 | * negative values, so make sure to always sign-extend it | |
332 | * from 32 bits so that it works correctly regardless of | |
333 | * whether we come from a 32-bit environment or not. | |
334 | */ | |
335 | case offsetof(struct user_regs_struct, orig_ax): | |
336 | value = (long) (s32) value; | |
337 | break; | |
338 | ||
2047b08b RM |
339 | case offsetof(struct user_regs_struct,fs_base): |
340 | if (value >= TASK_SIZE_OF(child)) | |
341 | return -EIO; | |
342 | /* | |
343 | * When changing the segment base, use do_arch_prctl | |
344 | * to set either thread.fs or thread.fsindex and the | |
345 | * corresponding GDT slot. | |
346 | */ | |
347 | if (child->thread.fs != value) | |
348 | return do_arch_prctl(child, ARCH_SET_FS, value); | |
349 | return 0; | |
350 | case offsetof(struct user_regs_struct,gs_base): | |
351 | /* | |
352 | * Exactly the same here as the %fs handling above. | |
353 | */ | |
354 | if (value >= TASK_SIZE_OF(child)) | |
355 | return -EIO; | |
356 | if (child->thread.gs != value) | |
357 | return do_arch_prctl(child, ARCH_SET_GS, value); | |
358 | return 0; | |
359 | #endif | |
06ee1b68 RM |
360 | } |
361 | ||
362 | *pt_regs_access(task_pt_regs(child), offset) = value; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static unsigned long getreg(struct task_struct *task, unsigned long offset) | |
367 | { | |
368 | switch (offset) { | |
369 | case offsetof(struct user_regs_struct, cs): | |
370 | case offsetof(struct user_regs_struct, ds): | |
371 | case offsetof(struct user_regs_struct, es): | |
372 | case offsetof(struct user_regs_struct, fs): | |
373 | case offsetof(struct user_regs_struct, gs): | |
374 | case offsetof(struct user_regs_struct, ss): | |
375 | return get_segment_reg(task, offset); | |
376 | ||
377 | case offsetof(struct user_regs_struct, flags): | |
378 | return get_flags(task); | |
2047b08b RM |
379 | |
380 | #ifdef CONFIG_X86_64 | |
381 | case offsetof(struct user_regs_struct, fs_base): { | |
382 | /* | |
383 | * do_arch_prctl may have used a GDT slot instead of | |
384 | * the MSR. To userland, it appears the same either | |
385 | * way, except the %fs segment selector might not be 0. | |
386 | */ | |
387 | unsigned int seg = task->thread.fsindex; | |
388 | if (task->thread.fs != 0) | |
389 | return task->thread.fs; | |
390 | if (task == current) | |
391 | asm("movl %%fs,%0" : "=r" (seg)); | |
392 | if (seg != FS_TLS_SEL) | |
393 | return 0; | |
394 | return get_desc_base(&task->thread.tls_array[FS_TLS]); | |
395 | } | |
396 | case offsetof(struct user_regs_struct, gs_base): { | |
397 | /* | |
398 | * Exactly the same here as the %fs handling above. | |
399 | */ | |
400 | unsigned int seg = task->thread.gsindex; | |
401 | if (task->thread.gs != 0) | |
402 | return task->thread.gs; | |
403 | if (task == current) | |
404 | asm("movl %%gs,%0" : "=r" (seg)); | |
405 | if (seg != GS_TLS_SEL) | |
406 | return 0; | |
407 | return get_desc_base(&task->thread.tls_array[GS_TLS]); | |
408 | } | |
409 | #endif | |
06ee1b68 RM |
410 | } |
411 | ||
412 | return *pt_regs_access(task_pt_regs(task), offset); | |
413 | } | |
414 | ||
91e7b707 RM |
415 | static int genregs_get(struct task_struct *target, |
416 | const struct user_regset *regset, | |
417 | unsigned int pos, unsigned int count, | |
418 | void *kbuf, void __user *ubuf) | |
419 | { | |
420 | if (kbuf) { | |
421 | unsigned long *k = kbuf; | |
422 | while (count > 0) { | |
423 | *k++ = getreg(target, pos); | |
424 | count -= sizeof(*k); | |
425 | pos += sizeof(*k); | |
426 | } | |
427 | } else { | |
428 | unsigned long __user *u = ubuf; | |
429 | while (count > 0) { | |
430 | if (__put_user(getreg(target, pos), u++)) | |
431 | return -EFAULT; | |
432 | count -= sizeof(*u); | |
433 | pos += sizeof(*u); | |
434 | } | |
435 | } | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | static int genregs_set(struct task_struct *target, | |
441 | const struct user_regset *regset, | |
442 | unsigned int pos, unsigned int count, | |
443 | const void *kbuf, const void __user *ubuf) | |
444 | { | |
445 | int ret = 0; | |
446 | if (kbuf) { | |
447 | const unsigned long *k = kbuf; | |
448 | while (count > 0 && !ret) { | |
449 | ret = putreg(target, pos, *k++); | |
450 | count -= sizeof(*k); | |
451 | pos += sizeof(*k); | |
452 | } | |
453 | } else { | |
454 | const unsigned long __user *u = ubuf; | |
455 | while (count > 0 && !ret) { | |
456 | unsigned long word; | |
457 | ret = __get_user(word, u++); | |
458 | if (ret) | |
459 | break; | |
460 | ret = putreg(target, pos, word); | |
461 | count -= sizeof(*u); | |
462 | pos += sizeof(*u); | |
463 | } | |
464 | } | |
465 | return ret; | |
466 | } | |
467 | ||
d9771e8c RM |
468 | /* |
469 | * This function is trivial and will be inlined by the compiler. | |
470 | * Having it separates the implementation details of debug | |
471 | * registers from the interface details of ptrace. | |
472 | */ | |
473 | static unsigned long ptrace_get_debugreg(struct task_struct *child, int n) | |
474 | { | |
0f534093 RM |
475 | switch (n) { |
476 | case 0: return child->thread.debugreg0; | |
477 | case 1: return child->thread.debugreg1; | |
478 | case 2: return child->thread.debugreg2; | |
479 | case 3: return child->thread.debugreg3; | |
480 | case 6: return child->thread.debugreg6; | |
481 | case 7: return child->thread.debugreg7; | |
482 | } | |
483 | return 0; | |
d9771e8c RM |
484 | } |
485 | ||
486 | static int ptrace_set_debugreg(struct task_struct *child, | |
487 | int n, unsigned long data) | |
488 | { | |
0f534093 RM |
489 | int i; |
490 | ||
d9771e8c RM |
491 | if (unlikely(n == 4 || n == 5)) |
492 | return -EIO; | |
493 | ||
2047b08b | 494 | if (n < 4 && unlikely(data >= debugreg_addr_limit(child))) |
d9771e8c RM |
495 | return -EIO; |
496 | ||
0f534093 RM |
497 | switch (n) { |
498 | case 0: child->thread.debugreg0 = data; break; | |
499 | case 1: child->thread.debugreg1 = data; break; | |
500 | case 2: child->thread.debugreg2 = data; break; | |
501 | case 3: child->thread.debugreg3 = data; break; | |
502 | ||
503 | case 6: | |
2047b08b RM |
504 | if ((data & ~0xffffffffUL) != 0) |
505 | return -EIO; | |
0f534093 RM |
506 | child->thread.debugreg6 = data; |
507 | break; | |
508 | ||
509 | case 7: | |
d9771e8c RM |
510 | /* |
511 | * Sanity-check data. Take one half-byte at once with | |
512 | * check = (val >> (16 + 4*i)) & 0xf. It contains the | |
513 | * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits | |
514 | * 2 and 3 are LENi. Given a list of invalid values, | |
515 | * we do mask |= 1 << invalid_value, so that | |
516 | * (mask >> check) & 1 is a correct test for invalid | |
517 | * values. | |
518 | * | |
519 | * R/Wi contains the type of the breakpoint / | |
520 | * watchpoint, LENi contains the length of the watched | |
521 | * data in the watchpoint case. | |
522 | * | |
523 | * The invalid values are: | |
2047b08b | 524 | * - LENi == 0x10 (undefined), so mask |= 0x0f00. [32-bit] |
d9771e8c RM |
525 | * - R/Wi == 0x10 (break on I/O reads or writes), so |
526 | * mask |= 0x4444. | |
527 | * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= | |
528 | * 0x1110. | |
529 | * | |
530 | * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. | |
531 | * | |
532 | * See the Intel Manual "System Programming Guide", | |
533 | * 15.2.4 | |
534 | * | |
535 | * Note that LENi == 0x10 is defined on x86_64 in long | |
536 | * mode (i.e. even for 32-bit userspace software, but | |
537 | * 64-bit kernel), so the x86_64 mask value is 0x5454. | |
538 | * See the AMD manual no. 24593 (AMD64 System Programming) | |
539 | */ | |
2047b08b RM |
540 | #ifdef CONFIG_X86_32 |
541 | #define DR7_MASK 0x5f54 | |
542 | #else | |
543 | #define DR7_MASK 0x5554 | |
544 | #endif | |
d9771e8c RM |
545 | data &= ~DR_CONTROL_RESERVED; |
546 | for (i = 0; i < 4; i++) | |
2047b08b | 547 | if ((DR7_MASK >> ((data >> (16 + 4*i)) & 0xf)) & 1) |
d9771e8c | 548 | return -EIO; |
0f534093 | 549 | child->thread.debugreg7 = data; |
d9771e8c RM |
550 | if (data) |
551 | set_tsk_thread_flag(child, TIF_DEBUG); | |
552 | else | |
553 | clear_tsk_thread_flag(child, TIF_DEBUG); | |
0f534093 | 554 | break; |
d9771e8c RM |
555 | } |
556 | ||
d9771e8c RM |
557 | return 0; |
558 | } | |
559 | ||
325af5fb RM |
560 | /* |
561 | * These access the current or another (stopped) task's io permission | |
562 | * bitmap for debugging or core dump. | |
563 | */ | |
564 | static int ioperm_active(struct task_struct *target, | |
565 | const struct user_regset *regset) | |
566 | { | |
567 | return target->thread.io_bitmap_max / regset->size; | |
568 | } | |
b4ef95de | 569 | |
325af5fb RM |
570 | static int ioperm_get(struct task_struct *target, |
571 | const struct user_regset *regset, | |
572 | unsigned int pos, unsigned int count, | |
573 | void *kbuf, void __user *ubuf) | |
eee3af4a | 574 | { |
325af5fb | 575 | if (!target->thread.io_bitmap_ptr) |
eee3af4a MM |
576 | return -ENXIO; |
577 | ||
325af5fb RM |
578 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
579 | target->thread.io_bitmap_ptr, | |
580 | 0, IO_BITMAP_BYTES); | |
581 | } | |
582 | ||
93fa7636 | 583 | #ifdef CONFIG_X86_PTRACE_BTS |
93fa7636 | 584 | static int ptrace_bts_read_record(struct task_struct *child, size_t index, |
eee3af4a MM |
585 | struct bts_struct __user *out) |
586 | { | |
c2724775 MM |
587 | const struct bts_trace *trace; |
588 | struct bts_struct bts; | |
589 | const unsigned char *at; | |
93fa7636 | 590 | int error; |
eee3af4a | 591 | |
c2724775 MM |
592 | trace = ds_read_bts(child->bts); |
593 | if (!trace) | |
594 | return -EPERM; | |
e4811f25 | 595 | |
c2724775 MM |
596 | at = trace->ds.top - ((index + 1) * trace->ds.size); |
597 | if ((void *)at < trace->ds.begin) | |
598 | at += (trace->ds.n * trace->ds.size); | |
93fa7636 | 599 | |
c2724775 MM |
600 | if (!trace->read) |
601 | return -EOPNOTSUPP; | |
93fa7636 | 602 | |
c2724775 | 603 | error = trace->read(child->bts, at, &bts); |
93fa7636 MM |
604 | if (error < 0) |
605 | return error; | |
e4811f25 | 606 | |
c2724775 | 607 | if (copy_to_user(out, &bts, sizeof(bts))) |
eee3af4a MM |
608 | return -EFAULT; |
609 | ||
c2724775 | 610 | return sizeof(bts); |
eee3af4a MM |
611 | } |
612 | ||
a95d67f8 | 613 | static int ptrace_bts_drain(struct task_struct *child, |
cba4b65d | 614 | long size, |
a95d67f8 MM |
615 | struct bts_struct __user *out) |
616 | { | |
c2724775 MM |
617 | const struct bts_trace *trace; |
618 | const unsigned char *at; | |
619 | int error, drained = 0; | |
eee3af4a | 620 | |
c2724775 MM |
621 | trace = ds_read_bts(child->bts); |
622 | if (!trace) | |
623 | return -EPERM; | |
a95d67f8 | 624 | |
c2724775 MM |
625 | if (!trace->read) |
626 | return -EOPNOTSUPP; | |
627 | ||
628 | if (size < (trace->ds.top - trace->ds.begin)) | |
cba4b65d MM |
629 | return -EIO; |
630 | ||
c2724775 MM |
631 | for (at = trace->ds.begin; (void *)at < trace->ds.top; |
632 | out++, drained++, at += trace->ds.size) { | |
633 | struct bts_struct bts; | |
634 | int error; | |
a95d67f8 | 635 | |
c2724775 MM |
636 | error = trace->read(child->bts, at, &bts); |
637 | if (error < 0) | |
638 | return error; | |
a95d67f8 | 639 | |
c2724775 | 640 | if (copy_to_user(out, &bts, sizeof(bts))) |
a95d67f8 MM |
641 | return -EFAULT; |
642 | } | |
643 | ||
c2724775 MM |
644 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
645 | ||
646 | error = ds_reset_bts(child->bts); | |
93fa7636 MM |
647 | if (error < 0) |
648 | return error; | |
a95d67f8 | 649 | |
c2724775 | 650 | return drained; |
a95d67f8 MM |
651 | } |
652 | ||
c5dee617 MM |
653 | static int ptrace_bts_allocate_buffer(struct task_struct *child, size_t size) |
654 | { | |
655 | child->bts_buffer = alloc_locked_buffer(size); | |
656 | if (!child->bts_buffer) | |
657 | return -ENOMEM; | |
658 | ||
659 | child->bts_size = size; | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | static void ptrace_bts_free_buffer(struct task_struct *child) | |
665 | { | |
666 | free_locked_buffer(child->bts_buffer, child->bts_size); | |
667 | child->bts_buffer = NULL; | |
668 | child->bts_size = 0; | |
669 | } | |
670 | ||
a95d67f8 | 671 | static int ptrace_bts_config(struct task_struct *child, |
cba4b65d | 672 | long cfg_size, |
a95d67f8 MM |
673 | const struct ptrace_bts_config __user *ucfg) |
674 | { | |
675 | struct ptrace_bts_config cfg; | |
c2724775 | 676 | unsigned int flags = 0; |
a95d67f8 | 677 | |
cba4b65d | 678 | if (cfg_size < sizeof(cfg)) |
c2724775 | 679 | return -EIO; |
cba4b65d | 680 | |
a95d67f8 | 681 | if (copy_from_user(&cfg, ucfg, sizeof(cfg))) |
c2724775 | 682 | return -EFAULT; |
6abb11ae | 683 | |
c2724775 MM |
684 | if (child->bts) { |
685 | ds_release_bts(child->bts); | |
686 | child->bts = NULL; | |
687 | } | |
93fa7636 | 688 | |
c2724775 MM |
689 | if (cfg.flags & PTRACE_BTS_O_SIGNAL) { |
690 | if (!cfg.signal) | |
691 | return -EINVAL; | |
ca0002a1 | 692 | |
c2724775 | 693 | return -EOPNOTSUPP; |
a95d67f8 | 694 | |
c2724775 MM |
695 | child->thread.bts_ovfl_signal = cfg.signal; |
696 | } | |
6abb11ae | 697 | |
c2724775 MM |
698 | if ((cfg.flags & PTRACE_BTS_O_ALLOC) && |
699 | (cfg.size != child->bts_size)) { | |
c5dee617 | 700 | int error; |
6abb11ae | 701 | |
c5dee617 MM |
702 | ptrace_bts_free_buffer(child); |
703 | ||
704 | error = ptrace_bts_allocate_buffer(child, cfg.size); | |
705 | if (error < 0) | |
706 | return error; | |
a95d67f8 MM |
707 | } |
708 | ||
da35c371 | 709 | if (cfg.flags & PTRACE_BTS_O_TRACE) |
c2724775 | 710 | flags |= BTS_USER; |
eee3af4a | 711 | |
da35c371 | 712 | if (cfg.flags & PTRACE_BTS_O_SCHED) |
c2724775 | 713 | flags |= BTS_TIMESTAMPS; |
eee3af4a | 714 | |
c2724775 MM |
715 | child->bts = ds_request_bts(child, child->bts_buffer, child->bts_size, |
716 | /* ovfl = */ NULL, /* th = */ (size_t)-1, | |
717 | flags); | |
718 | if (IS_ERR(child->bts)) { | |
719 | int error = PTR_ERR(child->bts); | |
cba4b65d | 720 | |
c5dee617 | 721 | ptrace_bts_free_buffer(child); |
c2724775 | 722 | child->bts = NULL; |
da35c371 | 723 | |
c2724775 MM |
724 | return error; |
725 | } | |
da35c371 | 726 | |
c2724775 | 727 | return sizeof(cfg); |
eee3af4a MM |
728 | } |
729 | ||
a95d67f8 | 730 | static int ptrace_bts_status(struct task_struct *child, |
cba4b65d | 731 | long cfg_size, |
a95d67f8 | 732 | struct ptrace_bts_config __user *ucfg) |
eee3af4a | 733 | { |
c2724775 | 734 | const struct bts_trace *trace; |
a95d67f8 | 735 | struct ptrace_bts_config cfg; |
eee3af4a | 736 | |
cba4b65d MM |
737 | if (cfg_size < sizeof(cfg)) |
738 | return -EIO; | |
739 | ||
c2724775 MM |
740 | trace = ds_read_bts(child->bts); |
741 | if (!trace) | |
742 | return -EPERM; | |
eee3af4a | 743 | |
93fa7636 | 744 | memset(&cfg, 0, sizeof(cfg)); |
c2724775 | 745 | cfg.size = trace->ds.end - trace->ds.begin; |
93fa7636 MM |
746 | cfg.signal = child->thread.bts_ovfl_signal; |
747 | cfg.bts_size = sizeof(struct bts_struct); | |
eee3af4a | 748 | |
93fa7636 MM |
749 | if (cfg.signal) |
750 | cfg.flags |= PTRACE_BTS_O_SIGNAL; | |
eee3af4a | 751 | |
c2724775 | 752 | if (trace->ds.flags & BTS_USER) |
93fa7636 MM |
753 | cfg.flags |= PTRACE_BTS_O_TRACE; |
754 | ||
c2724775 | 755 | if (trace->ds.flags & BTS_TIMESTAMPS) |
93fa7636 | 756 | cfg.flags |= PTRACE_BTS_O_SCHED; |
87e8407f | 757 | |
a95d67f8 MM |
758 | if (copy_to_user(ucfg, &cfg, sizeof(cfg))) |
759 | return -EFAULT; | |
eee3af4a | 760 | |
a95d67f8 | 761 | return sizeof(cfg); |
eee3af4a MM |
762 | } |
763 | ||
c2724775 | 764 | static int ptrace_bts_clear(struct task_struct *child) |
d8d4f157 | 765 | { |
c2724775 | 766 | const struct bts_trace *trace; |
d8d4f157 | 767 | |
c2724775 MM |
768 | trace = ds_read_bts(child->bts); |
769 | if (!trace) | |
770 | return -EPERM; | |
d8d4f157 | 771 | |
c2724775 | 772 | memset(trace->ds.begin, 0, trace->ds.n * trace->ds.size); |
d8d4f157 | 773 | |
c2724775 | 774 | return ds_reset_bts(child->bts); |
d8d4f157 AM |
775 | } |
776 | ||
c2724775 | 777 | static int ptrace_bts_size(struct task_struct *child) |
eee3af4a | 778 | { |
c2724775 | 779 | const struct bts_trace *trace; |
93fa7636 | 780 | |
c2724775 MM |
781 | trace = ds_read_bts(child->bts); |
782 | if (!trace) | |
783 | return -EPERM; | |
93fa7636 | 784 | |
c2724775 | 785 | return (trace->ds.top - trace->ds.begin) / trace->ds.size; |
93fa7636 | 786 | } |
bf53de90 MM |
787 | |
788 | static void ptrace_bts_fork(struct task_struct *tsk) | |
789 | { | |
790 | tsk->bts = NULL; | |
791 | tsk->bts_buffer = NULL; | |
792 | tsk->bts_size = 0; | |
793 | tsk->thread.bts_ovfl_signal = 0; | |
794 | } | |
795 | ||
796 | static void ptrace_bts_untrace(struct task_struct *child) | |
797 | { | |
798 | if (unlikely(child->bts)) { | |
799 | ds_release_bts(child->bts); | |
800 | child->bts = NULL; | |
801 | ||
c5dee617 MM |
802 | /* We cannot update total_vm and locked_vm since |
803 | child's mm is already gone. But we can reclaim the | |
804 | memory. */ | |
bf53de90 MM |
805 | kfree(child->bts_buffer); |
806 | child->bts_buffer = NULL; | |
807 | child->bts_size = 0; | |
808 | } | |
809 | } | |
810 | ||
811 | static void ptrace_bts_detach(struct task_struct *child) | |
812 | { | |
c5dee617 MM |
813 | if (unlikely(child->bts)) { |
814 | ds_release_bts(child->bts); | |
815 | child->bts = NULL; | |
816 | ||
817 | ptrace_bts_free_buffer(child); | |
818 | } | |
bf53de90 MM |
819 | } |
820 | #else | |
821 | static inline void ptrace_bts_fork(struct task_struct *tsk) {} | |
822 | static inline void ptrace_bts_detach(struct task_struct *child) {} | |
823 | static inline void ptrace_bts_untrace(struct task_struct *child) {} | |
93fa7636 | 824 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 825 | |
bf53de90 MM |
826 | void x86_ptrace_fork(struct task_struct *child, unsigned long clone_flags) |
827 | { | |
828 | ptrace_bts_fork(child); | |
829 | } | |
830 | ||
831 | void x86_ptrace_untrace(struct task_struct *child) | |
832 | { | |
833 | ptrace_bts_untrace(child); | |
834 | } | |
835 | ||
1da177e4 LT |
836 | /* |
837 | * Called by kernel/ptrace.c when detaching.. | |
838 | * | |
839 | * Make sure the single step bit is not set. | |
840 | */ | |
841 | void ptrace_disable(struct task_struct *child) | |
9e714bed | 842 | { |
7f232343 | 843 | user_disable_single_step(child); |
e9c86c78 | 844 | #ifdef TIF_SYSCALL_EMU |
ab1c23c2 | 845 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
e9c86c78 | 846 | #endif |
bf53de90 | 847 | ptrace_bts_detach(child); |
1da177e4 LT |
848 | } |
849 | ||
5a4646a4 RM |
850 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
851 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ | |
852 | #endif | |
853 | ||
481bed45 | 854 | long arch_ptrace(struct task_struct *child, long request, long addr, long data) |
1da177e4 | 855 | { |
5a4646a4 | 856 | int ret; |
1da177e4 LT |
857 | unsigned long __user *datap = (unsigned long __user *)data; |
858 | ||
1da177e4 | 859 | switch (request) { |
1da177e4 LT |
860 | /* read the word at location addr in the USER area. */ |
861 | case PTRACE_PEEKUSR: { | |
862 | unsigned long tmp; | |
863 | ||
864 | ret = -EIO; | |
e9c86c78 RM |
865 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
866 | addr >= sizeof(struct user)) | |
1da177e4 LT |
867 | break; |
868 | ||
869 | tmp = 0; /* Default return condition */ | |
e9c86c78 | 870 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 871 | tmp = getreg(child, addr); |
e9c86c78 RM |
872 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
873 | addr <= offsetof(struct user, u_debugreg[7])) { | |
874 | addr -= offsetof(struct user, u_debugreg[0]); | |
875 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); | |
1da177e4 LT |
876 | } |
877 | ret = put_user(tmp, datap); | |
878 | break; | |
879 | } | |
880 | ||
1da177e4 LT |
881 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
882 | ret = -EIO; | |
e9c86c78 RM |
883 | if ((addr & (sizeof(data) - 1)) || addr < 0 || |
884 | addr >= sizeof(struct user)) | |
1da177e4 LT |
885 | break; |
886 | ||
e9c86c78 | 887 | if (addr < sizeof(struct user_regs_struct)) |
1da177e4 | 888 | ret = putreg(child, addr, data); |
e9c86c78 RM |
889 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
890 | addr <= offsetof(struct user, u_debugreg[7])) { | |
891 | addr -= offsetof(struct user, u_debugreg[0]); | |
892 | ret = ptrace_set_debugreg(child, | |
893 | addr / sizeof(data), data); | |
1da177e4 | 894 | } |
e9c86c78 | 895 | break; |
1da177e4 | 896 | |
5a4646a4 RM |
897 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
898 | return copy_regset_to_user(child, | |
899 | task_user_regset_view(current), | |
900 | REGSET_GENERAL, | |
901 | 0, sizeof(struct user_regs_struct), | |
902 | datap); | |
903 | ||
904 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
905 | return copy_regset_from_user(child, | |
906 | task_user_regset_view(current), | |
907 | REGSET_GENERAL, | |
908 | 0, sizeof(struct user_regs_struct), | |
909 | datap); | |
910 | ||
911 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
912 | return copy_regset_to_user(child, | |
913 | task_user_regset_view(current), | |
914 | REGSET_FP, | |
915 | 0, sizeof(struct user_i387_struct), | |
916 | datap); | |
917 | ||
918 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
919 | return copy_regset_from_user(child, | |
920 | task_user_regset_view(current), | |
921 | REGSET_FP, | |
922 | 0, sizeof(struct user_i387_struct), | |
923 | datap); | |
1da177e4 | 924 | |
e9c86c78 | 925 | #ifdef CONFIG_X86_32 |
5a4646a4 RM |
926 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
927 | return copy_regset_to_user(child, &user_x86_32_view, | |
928 | REGSET_XFP, | |
929 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 930 | datap) ? -EIO : 0; |
5a4646a4 RM |
931 | |
932 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
933 | return copy_regset_from_user(child, &user_x86_32_view, | |
934 | REGSET_XFP, | |
935 | 0, sizeof(struct user_fxsr_struct), | |
45fdc3a7 | 936 | datap) ? -EIO : 0; |
e9c86c78 | 937 | #endif |
1da177e4 | 938 | |
e9c86c78 | 939 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
1da177e4 | 940 | case PTRACE_GET_THREAD_AREA: |
efd1ca52 RM |
941 | if (addr < 0) |
942 | return -EIO; | |
943 | ret = do_get_thread_area(child, addr, | |
944 | (struct user_desc __user *) data); | |
1da177e4 LT |
945 | break; |
946 | ||
947 | case PTRACE_SET_THREAD_AREA: | |
efd1ca52 RM |
948 | if (addr < 0) |
949 | return -EIO; | |
950 | ret = do_set_thread_area(child, addr, | |
951 | (struct user_desc __user *) data, 0); | |
1da177e4 | 952 | break; |
e9c86c78 RM |
953 | #endif |
954 | ||
955 | #ifdef CONFIG_X86_64 | |
956 | /* normal 64bit interface to access TLS data. | |
957 | Works just like arch_prctl, except that the arguments | |
958 | are reversed. */ | |
959 | case PTRACE_ARCH_PRCTL: | |
960 | ret = do_arch_prctl(child, data, addr); | |
961 | break; | |
962 | #endif | |
1da177e4 | 963 | |
b4ef95de IM |
964 | /* |
965 | * These bits need more cooking - not enabled yet: | |
966 | */ | |
93fa7636 | 967 | #ifdef CONFIG_X86_PTRACE_BTS |
a95d67f8 MM |
968 | case PTRACE_BTS_CONFIG: |
969 | ret = ptrace_bts_config | |
cba4b65d | 970 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
971 | break; |
972 | ||
a95d67f8 MM |
973 | case PTRACE_BTS_STATUS: |
974 | ret = ptrace_bts_status | |
cba4b65d | 975 | (child, data, (struct ptrace_bts_config __user *)addr); |
eee3af4a MM |
976 | break; |
977 | ||
c2724775 MM |
978 | case PTRACE_BTS_SIZE: |
979 | ret = ptrace_bts_size(child); | |
eee3af4a MM |
980 | break; |
981 | ||
a95d67f8 | 982 | case PTRACE_BTS_GET: |
eee3af4a | 983 | ret = ptrace_bts_read_record |
a95d67f8 | 984 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a MM |
985 | break; |
986 | ||
a95d67f8 | 987 | case PTRACE_BTS_CLEAR: |
c2724775 | 988 | ret = ptrace_bts_clear(child); |
eee3af4a MM |
989 | break; |
990 | ||
a95d67f8 MM |
991 | case PTRACE_BTS_DRAIN: |
992 | ret = ptrace_bts_drain | |
cba4b65d | 993 | (child, data, (struct bts_struct __user *) addr); |
eee3af4a | 994 | break; |
93fa7636 | 995 | #endif /* CONFIG_X86_PTRACE_BTS */ |
eee3af4a | 996 | |
1da177e4 LT |
997 | default: |
998 | ret = ptrace_request(child, request, addr, data); | |
999 | break; | |
1000 | } | |
d9771e8c | 1001 | |
1da177e4 LT |
1002 | return ret; |
1003 | } | |
1004 | ||
cb757c41 RM |
1005 | #ifdef CONFIG_IA32_EMULATION |
1006 | ||
099cd6e9 RM |
1007 | #include <linux/compat.h> |
1008 | #include <linux/syscalls.h> | |
1009 | #include <asm/ia32.h> | |
cb757c41 RM |
1010 | #include <asm/user32.h> |
1011 | ||
1012 | #define R32(l,q) \ | |
1013 | case offsetof(struct user32, regs.l): \ | |
1014 | regs->q = value; break | |
1015 | ||
1016 | #define SEG32(rs) \ | |
1017 | case offsetof(struct user32, regs.rs): \ | |
1018 | return set_segment_reg(child, \ | |
1019 | offsetof(struct user_regs_struct, rs), \ | |
1020 | value); \ | |
1021 | break | |
1022 | ||
1023 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) | |
1024 | { | |
1025 | struct pt_regs *regs = task_pt_regs(child); | |
1026 | ||
1027 | switch (regno) { | |
1028 | ||
1029 | SEG32(cs); | |
1030 | SEG32(ds); | |
1031 | SEG32(es); | |
1032 | SEG32(fs); | |
1033 | SEG32(gs); | |
1034 | SEG32(ss); | |
1035 | ||
1036 | R32(ebx, bx); | |
1037 | R32(ecx, cx); | |
1038 | R32(edx, dx); | |
1039 | R32(edi, di); | |
1040 | R32(esi, si); | |
1041 | R32(ebp, bp); | |
1042 | R32(eax, ax); | |
cb757c41 RM |
1043 | R32(eip, ip); |
1044 | R32(esp, sp); | |
1045 | ||
40f0933d RM |
1046 | case offsetof(struct user32, regs.orig_eax): |
1047 | /* | |
1048 | * Sign-extend the value so that orig_eax = -1 | |
1049 | * causes (long)orig_ax < 0 tests to fire correctly. | |
1050 | */ | |
1051 | regs->orig_ax = (long) (s32) value; | |
1052 | break; | |
1053 | ||
cb757c41 RM |
1054 | case offsetof(struct user32, regs.eflags): |
1055 | return set_flags(child, value); | |
1056 | ||
1057 | case offsetof(struct user32, u_debugreg[0]) ... | |
1058 | offsetof(struct user32, u_debugreg[7]): | |
1059 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1060 | return ptrace_set_debugreg(child, regno / 4, value); | |
1061 | ||
1062 | default: | |
1063 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1064 | return -EIO; | |
1065 | ||
1066 | /* | |
1067 | * Other dummy fields in the virtual user structure | |
1068 | * are ignored | |
1069 | */ | |
1070 | break; | |
1071 | } | |
1072 | return 0; | |
1073 | } | |
1074 | ||
1075 | #undef R32 | |
1076 | #undef SEG32 | |
1077 | ||
1078 | #define R32(l,q) \ | |
1079 | case offsetof(struct user32, regs.l): \ | |
1080 | *val = regs->q; break | |
1081 | ||
1082 | #define SEG32(rs) \ | |
1083 | case offsetof(struct user32, regs.rs): \ | |
1084 | *val = get_segment_reg(child, \ | |
1085 | offsetof(struct user_regs_struct, rs)); \ | |
1086 | break | |
1087 | ||
1088 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) | |
1089 | { | |
1090 | struct pt_regs *regs = task_pt_regs(child); | |
1091 | ||
1092 | switch (regno) { | |
1093 | ||
1094 | SEG32(ds); | |
1095 | SEG32(es); | |
1096 | SEG32(fs); | |
1097 | SEG32(gs); | |
1098 | ||
1099 | R32(cs, cs); | |
1100 | R32(ss, ss); | |
1101 | R32(ebx, bx); | |
1102 | R32(ecx, cx); | |
1103 | R32(edx, dx); | |
1104 | R32(edi, di); | |
1105 | R32(esi, si); | |
1106 | R32(ebp, bp); | |
1107 | R32(eax, ax); | |
1108 | R32(orig_eax, orig_ax); | |
1109 | R32(eip, ip); | |
1110 | R32(esp, sp); | |
1111 | ||
1112 | case offsetof(struct user32, regs.eflags): | |
1113 | *val = get_flags(child); | |
1114 | break; | |
1115 | ||
1116 | case offsetof(struct user32, u_debugreg[0]) ... | |
1117 | offsetof(struct user32, u_debugreg[7]): | |
1118 | regno -= offsetof(struct user32, u_debugreg[0]); | |
1119 | *val = ptrace_get_debugreg(child, regno / 4); | |
1120 | break; | |
1121 | ||
1122 | default: | |
1123 | if (regno > sizeof(struct user32) || (regno & 3)) | |
1124 | return -EIO; | |
1125 | ||
1126 | /* | |
1127 | * Other dummy fields in the virtual user structure | |
1128 | * are ignored | |
1129 | */ | |
1130 | *val = 0; | |
1131 | break; | |
1132 | } | |
1133 | return 0; | |
1134 | } | |
1135 | ||
1136 | #undef R32 | |
1137 | #undef SEG32 | |
1138 | ||
91e7b707 RM |
1139 | static int genregs32_get(struct task_struct *target, |
1140 | const struct user_regset *regset, | |
1141 | unsigned int pos, unsigned int count, | |
1142 | void *kbuf, void __user *ubuf) | |
1143 | { | |
1144 | if (kbuf) { | |
1145 | compat_ulong_t *k = kbuf; | |
1146 | while (count > 0) { | |
1147 | getreg32(target, pos, k++); | |
1148 | count -= sizeof(*k); | |
1149 | pos += sizeof(*k); | |
1150 | } | |
1151 | } else { | |
1152 | compat_ulong_t __user *u = ubuf; | |
1153 | while (count > 0) { | |
1154 | compat_ulong_t word; | |
1155 | getreg32(target, pos, &word); | |
1156 | if (__put_user(word, u++)) | |
1157 | return -EFAULT; | |
1158 | count -= sizeof(*u); | |
1159 | pos += sizeof(*u); | |
1160 | } | |
1161 | } | |
1162 | ||
1163 | return 0; | |
1164 | } | |
1165 | ||
1166 | static int genregs32_set(struct task_struct *target, | |
1167 | const struct user_regset *regset, | |
1168 | unsigned int pos, unsigned int count, | |
1169 | const void *kbuf, const void __user *ubuf) | |
1170 | { | |
1171 | int ret = 0; | |
1172 | if (kbuf) { | |
1173 | const compat_ulong_t *k = kbuf; | |
1174 | while (count > 0 && !ret) { | |
f9cb02b0 | 1175 | ret = putreg32(target, pos, *k++); |
91e7b707 RM |
1176 | count -= sizeof(*k); |
1177 | pos += sizeof(*k); | |
1178 | } | |
1179 | } else { | |
1180 | const compat_ulong_t __user *u = ubuf; | |
1181 | while (count > 0 && !ret) { | |
1182 | compat_ulong_t word; | |
1183 | ret = __get_user(word, u++); | |
1184 | if (ret) | |
1185 | break; | |
f9cb02b0 | 1186 | ret = putreg32(target, pos, word); |
91e7b707 RM |
1187 | count -= sizeof(*u); |
1188 | pos += sizeof(*u); | |
1189 | } | |
1190 | } | |
1191 | return ret; | |
1192 | } | |
1193 | ||
562b80ba RM |
1194 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
1195 | compat_ulong_t caddr, compat_ulong_t cdata) | |
099cd6e9 | 1196 | { |
562b80ba RM |
1197 | unsigned long addr = caddr; |
1198 | unsigned long data = cdata; | |
099cd6e9 RM |
1199 | void __user *datap = compat_ptr(data); |
1200 | int ret; | |
1201 | __u32 val; | |
1202 | ||
099cd6e9 | 1203 | switch (request) { |
099cd6e9 RM |
1204 | case PTRACE_PEEKUSR: |
1205 | ret = getreg32(child, addr, &val); | |
1206 | if (ret == 0) | |
1207 | ret = put_user(val, (__u32 __user *)datap); | |
1208 | break; | |
1209 | ||
1210 | case PTRACE_POKEUSR: | |
1211 | ret = putreg32(child, addr, data); | |
1212 | break; | |
1213 | ||
5a4646a4 RM |
1214 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
1215 | return copy_regset_to_user(child, &user_x86_32_view, | |
1216 | REGSET_GENERAL, | |
1217 | 0, sizeof(struct user_regs_struct32), | |
1218 | datap); | |
1219 | ||
1220 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ | |
1221 | return copy_regset_from_user(child, &user_x86_32_view, | |
1222 | REGSET_GENERAL, 0, | |
1223 | sizeof(struct user_regs_struct32), | |
1224 | datap); | |
1225 | ||
1226 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ | |
1227 | return copy_regset_to_user(child, &user_x86_32_view, | |
1228 | REGSET_FP, 0, | |
1229 | sizeof(struct user_i387_ia32_struct), | |
1230 | datap); | |
1231 | ||
1232 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ | |
1233 | return copy_regset_from_user( | |
1234 | child, &user_x86_32_view, REGSET_FP, | |
1235 | 0, sizeof(struct user_i387_ia32_struct), datap); | |
1236 | ||
1237 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ | |
1238 | return copy_regset_to_user(child, &user_x86_32_view, | |
1239 | REGSET_XFP, 0, | |
1240 | sizeof(struct user32_fxsr_struct), | |
1241 | datap); | |
1242 | ||
1243 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ | |
1244 | return copy_regset_from_user(child, &user_x86_32_view, | |
1245 | REGSET_XFP, 0, | |
1246 | sizeof(struct user32_fxsr_struct), | |
1247 | datap); | |
099cd6e9 | 1248 | |
562b80ba RM |
1249 | case PTRACE_GET_THREAD_AREA: |
1250 | case PTRACE_SET_THREAD_AREA: | |
c2724775 MM |
1251 | #ifdef CONFIG_X86_PTRACE_BTS |
1252 | case PTRACE_BTS_CONFIG: | |
1253 | case PTRACE_BTS_STATUS: | |
1254 | case PTRACE_BTS_SIZE: | |
1255 | case PTRACE_BTS_GET: | |
1256 | case PTRACE_BTS_CLEAR: | |
1257 | case PTRACE_BTS_DRAIN: | |
1258 | #endif /* CONFIG_X86_PTRACE_BTS */ | |
562b80ba RM |
1259 | return arch_ptrace(child, request, addr, data); |
1260 | ||
099cd6e9 | 1261 | default: |
fdadd54d | 1262 | return compat_ptrace_request(child, request, addr, data); |
099cd6e9 RM |
1263 | } |
1264 | ||
099cd6e9 RM |
1265 | return ret; |
1266 | } | |
1267 | ||
cb757c41 RM |
1268 | #endif /* CONFIG_IA32_EMULATION */ |
1269 | ||
070459d9 RM |
1270 | #ifdef CONFIG_X86_64 |
1271 | ||
1272 | static const struct user_regset x86_64_regsets[] = { | |
1273 | [REGSET_GENERAL] = { | |
1274 | .core_note_type = NT_PRSTATUS, | |
1275 | .n = sizeof(struct user_regs_struct) / sizeof(long), | |
1276 | .size = sizeof(long), .align = sizeof(long), | |
1277 | .get = genregs_get, .set = genregs_set | |
1278 | }, | |
1279 | [REGSET_FP] = { | |
1280 | .core_note_type = NT_PRFPREG, | |
1281 | .n = sizeof(struct user_i387_struct) / sizeof(long), | |
1282 | .size = sizeof(long), .align = sizeof(long), | |
1283 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1284 | }, | |
325af5fb RM |
1285 | [REGSET_IOPERM64] = { |
1286 | .core_note_type = NT_386_IOPERM, | |
1287 | .n = IO_BITMAP_LONGS, | |
1288 | .size = sizeof(long), .align = sizeof(long), | |
1289 | .active = ioperm_active, .get = ioperm_get | |
1290 | }, | |
070459d9 RM |
1291 | }; |
1292 | ||
1293 | static const struct user_regset_view user_x86_64_view = { | |
1294 | .name = "x86_64", .e_machine = EM_X86_64, | |
1295 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) | |
1296 | }; | |
1297 | ||
1298 | #else /* CONFIG_X86_32 */ | |
1299 | ||
1300 | #define user_regs_struct32 user_regs_struct | |
1301 | #define genregs32_get genregs_get | |
1302 | #define genregs32_set genregs_set | |
1303 | ||
1f465f4e RM |
1304 | #define user_i387_ia32_struct user_i387_struct |
1305 | #define user32_fxsr_struct user_fxsr_struct | |
1306 | ||
070459d9 RM |
1307 | #endif /* CONFIG_X86_64 */ |
1308 | ||
1309 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1310 | static const struct user_regset x86_32_regsets[] = { | |
1311 | [REGSET_GENERAL] = { | |
1312 | .core_note_type = NT_PRSTATUS, | |
1313 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), | |
1314 | .size = sizeof(u32), .align = sizeof(u32), | |
1315 | .get = genregs32_get, .set = genregs32_set | |
1316 | }, | |
1317 | [REGSET_FP] = { | |
1318 | .core_note_type = NT_PRFPREG, | |
1f465f4e | 1319 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
070459d9 RM |
1320 | .size = sizeof(u32), .align = sizeof(u32), |
1321 | .active = fpregs_active, .get = fpregs_get, .set = fpregs_set | |
1322 | }, | |
1323 | [REGSET_XFP] = { | |
1324 | .core_note_type = NT_PRXFPREG, | |
1f465f4e | 1325 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
070459d9 RM |
1326 | .size = sizeof(u32), .align = sizeof(u32), |
1327 | .active = xfpregs_active, .get = xfpregs_get, .set = xfpregs_set | |
1328 | }, | |
1329 | [REGSET_TLS] = { | |
bb61682b | 1330 | .core_note_type = NT_386_TLS, |
070459d9 RM |
1331 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
1332 | .size = sizeof(struct user_desc), | |
1333 | .align = sizeof(struct user_desc), | |
1334 | .active = regset_tls_active, | |
1335 | .get = regset_tls_get, .set = regset_tls_set | |
1336 | }, | |
325af5fb RM |
1337 | [REGSET_IOPERM32] = { |
1338 | .core_note_type = NT_386_IOPERM, | |
1339 | .n = IO_BITMAP_BYTES / sizeof(u32), | |
1340 | .size = sizeof(u32), .align = sizeof(u32), | |
1341 | .active = ioperm_active, .get = ioperm_get | |
1342 | }, | |
070459d9 RM |
1343 | }; |
1344 | ||
1345 | static const struct user_regset_view user_x86_32_view = { | |
1346 | .name = "i386", .e_machine = EM_386, | |
1347 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) | |
1348 | }; | |
1349 | #endif | |
1350 | ||
1351 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) | |
1352 | { | |
1353 | #ifdef CONFIG_IA32_EMULATION | |
1354 | if (test_tsk_thread_flag(task, TIF_IA32)) | |
1355 | #endif | |
1356 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION | |
1357 | return &user_x86_32_view; | |
1358 | #endif | |
1359 | #ifdef CONFIG_X86_64 | |
1360 | return &user_x86_64_view; | |
1361 | #endif | |
1362 | } | |
1363 | ||
da654b74 SD |
1364 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
1365 | int error_code, int si_code) | |
1da177e4 LT |
1366 | { |
1367 | struct siginfo info; | |
1368 | ||
1369 | tsk->thread.trap_no = 1; | |
1370 | tsk->thread.error_code = error_code; | |
1371 | ||
1372 | memset(&info, 0, sizeof(info)); | |
1373 | info.si_signo = SIGTRAP; | |
da654b74 | 1374 | info.si_code = si_code; |
1da177e4 | 1375 | |
65ea5b03 PA |
1376 | /* User-mode ip? */ |
1377 | info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL; | |
1da177e4 | 1378 | |
27b46d76 | 1379 | /* Send us the fake SIGTRAP */ |
1da177e4 LT |
1380 | force_sig_info(SIGTRAP, &info, tsk); |
1381 | } | |
1382 | ||
86976cd8 | 1383 | |
d4d67150 RM |
1384 | #ifdef CONFIG_X86_32 |
1385 | # define IS_IA32 1 | |
1386 | #elif defined CONFIG_IA32_EMULATION | |
1387 | # define IS_IA32 test_thread_flag(TIF_IA32) | |
1388 | #else | |
1389 | # define IS_IA32 0 | |
1390 | #endif | |
1391 | ||
1392 | /* | |
1393 | * We must return the syscall number to actually look up in the table. | |
1394 | * This can be -1L to skip running any syscall at all. | |
1395 | */ | |
1396 | asmregparm long syscall_trace_enter(struct pt_regs *regs) | |
86976cd8 | 1397 | { |
d4d67150 RM |
1398 | long ret = 0; |
1399 | ||
380fdd75 RM |
1400 | /* |
1401 | * If we stepped into a sysenter/syscall insn, it trapped in | |
1402 | * kernel mode; do_debug() cleared TF and set TIF_SINGLESTEP. | |
1403 | * If user-mode had set TF itself, then it's still clear from | |
1404 | * do_debug() and we need to set it again to restore the user | |
1405 | * state. If we entered on the slow path, TF was already set. | |
1406 | */ | |
1407 | if (test_thread_flag(TIF_SINGLESTEP)) | |
1408 | regs->flags |= X86_EFLAGS_TF; | |
1409 | ||
86976cd8 RM |
1410 | /* do the secure computing check first */ |
1411 | secure_computing(regs->orig_ax); | |
1412 | ||
d4d67150 RM |
1413 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) |
1414 | ret = -1L; | |
1415 | ||
eeea3c3f RM |
1416 | if ((ret || test_thread_flag(TIF_SYSCALL_TRACE)) && |
1417 | tracehook_report_syscall_entry(regs)) | |
1418 | ret = -1L; | |
86976cd8 RM |
1419 | |
1420 | if (unlikely(current->audit_context)) { | |
d4d67150 | 1421 | if (IS_IA32) |
86976cd8 RM |
1422 | audit_syscall_entry(AUDIT_ARCH_I386, |
1423 | regs->orig_ax, | |
1424 | regs->bx, regs->cx, | |
1425 | regs->dx, regs->si); | |
d4d67150 RM |
1426 | #ifdef CONFIG_X86_64 |
1427 | else | |
86976cd8 RM |
1428 | audit_syscall_entry(AUDIT_ARCH_X86_64, |
1429 | regs->orig_ax, | |
1430 | regs->di, regs->si, | |
1431 | regs->dx, regs->r10); | |
d4d67150 | 1432 | #endif |
86976cd8 | 1433 | } |
d4d67150 RM |
1434 | |
1435 | return ret ?: regs->orig_ax; | |
86976cd8 RM |
1436 | } |
1437 | ||
d4d67150 | 1438 | asmregparm void syscall_trace_leave(struct pt_regs *regs) |
86976cd8 RM |
1439 | { |
1440 | if (unlikely(current->audit_context)) | |
1441 | audit_syscall_exit(AUDITSC_RESULT(regs->ax), regs->ax); | |
1442 | ||
d4d67150 | 1443 | if (test_thread_flag(TIF_SYSCALL_TRACE)) |
eeea3c3f | 1444 | tracehook_report_syscall_exit(regs, 0); |
86976cd8 | 1445 | |
d4d67150 RM |
1446 | /* |
1447 | * If TIF_SYSCALL_EMU is set, we only get here because of | |
1448 | * TIF_SINGLESTEP (i.e. this is PTRACE_SYSEMU_SINGLESTEP). | |
1449 | * We already reported this syscall instruction in | |
1450 | * syscall_trace_enter(), so don't do any more now. | |
1451 | */ | |
1452 | if (unlikely(test_thread_flag(TIF_SYSCALL_EMU))) | |
1453 | return; | |
1454 | ||
1455 | /* | |
1456 | * If we are single-stepping, synthesize a trap to follow the | |
1457 | * system call instruction. | |
1458 | */ | |
1459 | if (test_thread_flag(TIF_SINGLESTEP) && | |
eeea3c3f | 1460 | tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL)) |
da654b74 | 1461 | send_sigtrap(current, regs, 0, TRAP_BRKPT); |
d4d67150 | 1462 | } |