| 1 | /* By Ross Biro 1/23/92 */ |
| 2 | /* |
| 3 | * Pentium III FXSR, SSE support |
| 4 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
| 5 | */ |
| 6 | |
| 7 | #include <linux/kernel.h> |
| 8 | #include <linux/sched.h> |
| 9 | #include <linux/mm.h> |
| 10 | #include <linux/smp.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/slab.h> |
| 13 | #include <linux/ptrace.h> |
| 14 | #include <linux/tracehook.h> |
| 15 | #include <linux/user.h> |
| 16 | #include <linux/elf.h> |
| 17 | #include <linux/security.h> |
| 18 | #include <linux/audit.h> |
| 19 | #include <linux/seccomp.h> |
| 20 | #include <linux/signal.h> |
| 21 | #include <linux/perf_event.h> |
| 22 | #include <linux/hw_breakpoint.h> |
| 23 | #include <linux/rcupdate.h> |
| 24 | #include <linux/export.h> |
| 25 | #include <linux/context_tracking.h> |
| 26 | |
| 27 | #include <asm/uaccess.h> |
| 28 | #include <asm/pgtable.h> |
| 29 | #include <asm/processor.h> |
| 30 | #include <asm/fpu/internal.h> |
| 31 | #include <asm/fpu/signal.h> |
| 32 | #include <asm/fpu/regset.h> |
| 33 | #include <asm/debugreg.h> |
| 34 | #include <asm/ldt.h> |
| 35 | #include <asm/desc.h> |
| 36 | #include <asm/prctl.h> |
| 37 | #include <asm/proto.h> |
| 38 | #include <asm/hw_breakpoint.h> |
| 39 | #include <asm/traps.h> |
| 40 | #include <asm/syscall.h> |
| 41 | |
| 42 | #include "tls.h" |
| 43 | |
| 44 | enum x86_regset { |
| 45 | REGSET_GENERAL, |
| 46 | REGSET_FP, |
| 47 | REGSET_XFP, |
| 48 | REGSET_IOPERM64 = REGSET_XFP, |
| 49 | REGSET_XSTATE, |
| 50 | REGSET_TLS, |
| 51 | REGSET_IOPERM32, |
| 52 | }; |
| 53 | |
| 54 | struct pt_regs_offset { |
| 55 | const char *name; |
| 56 | int offset; |
| 57 | }; |
| 58 | |
| 59 | #define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)} |
| 60 | #define REG_OFFSET_END {.name = NULL, .offset = 0} |
| 61 | |
| 62 | static const struct pt_regs_offset regoffset_table[] = { |
| 63 | #ifdef CONFIG_X86_64 |
| 64 | REG_OFFSET_NAME(r15), |
| 65 | REG_OFFSET_NAME(r14), |
| 66 | REG_OFFSET_NAME(r13), |
| 67 | REG_OFFSET_NAME(r12), |
| 68 | REG_OFFSET_NAME(r11), |
| 69 | REG_OFFSET_NAME(r10), |
| 70 | REG_OFFSET_NAME(r9), |
| 71 | REG_OFFSET_NAME(r8), |
| 72 | #endif |
| 73 | REG_OFFSET_NAME(bx), |
| 74 | REG_OFFSET_NAME(cx), |
| 75 | REG_OFFSET_NAME(dx), |
| 76 | REG_OFFSET_NAME(si), |
| 77 | REG_OFFSET_NAME(di), |
| 78 | REG_OFFSET_NAME(bp), |
| 79 | REG_OFFSET_NAME(ax), |
| 80 | #ifdef CONFIG_X86_32 |
| 81 | REG_OFFSET_NAME(ds), |
| 82 | REG_OFFSET_NAME(es), |
| 83 | REG_OFFSET_NAME(fs), |
| 84 | REG_OFFSET_NAME(gs), |
| 85 | #endif |
| 86 | REG_OFFSET_NAME(orig_ax), |
| 87 | REG_OFFSET_NAME(ip), |
| 88 | REG_OFFSET_NAME(cs), |
| 89 | REG_OFFSET_NAME(flags), |
| 90 | REG_OFFSET_NAME(sp), |
| 91 | REG_OFFSET_NAME(ss), |
| 92 | REG_OFFSET_END, |
| 93 | }; |
| 94 | |
| 95 | /** |
| 96 | * regs_query_register_offset() - query register offset from its name |
| 97 | * @name: the name of a register |
| 98 | * |
| 99 | * regs_query_register_offset() returns the offset of a register in struct |
| 100 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; |
| 101 | */ |
| 102 | int regs_query_register_offset(const char *name) |
| 103 | { |
| 104 | const struct pt_regs_offset *roff; |
| 105 | for (roff = regoffset_table; roff->name != NULL; roff++) |
| 106 | if (!strcmp(roff->name, name)) |
| 107 | return roff->offset; |
| 108 | return -EINVAL; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * regs_query_register_name() - query register name from its offset |
| 113 | * @offset: the offset of a register in struct pt_regs. |
| 114 | * |
| 115 | * regs_query_register_name() returns the name of a register from its |
| 116 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; |
| 117 | */ |
| 118 | const char *regs_query_register_name(unsigned int offset) |
| 119 | { |
| 120 | const struct pt_regs_offset *roff; |
| 121 | for (roff = regoffset_table; roff->name != NULL; roff++) |
| 122 | if (roff->offset == offset) |
| 123 | return roff->name; |
| 124 | return NULL; |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * does not yet catch signals sent when the child dies. |
| 129 | * in exit.c or in signal.c. |
| 130 | */ |
| 131 | |
| 132 | /* |
| 133 | * Determines which flags the user has access to [1 = access, 0 = no access]. |
| 134 | */ |
| 135 | #define FLAG_MASK_32 ((unsigned long) \ |
| 136 | (X86_EFLAGS_CF | X86_EFLAGS_PF | \ |
| 137 | X86_EFLAGS_AF | X86_EFLAGS_ZF | \ |
| 138 | X86_EFLAGS_SF | X86_EFLAGS_TF | \ |
| 139 | X86_EFLAGS_DF | X86_EFLAGS_OF | \ |
| 140 | X86_EFLAGS_RF | X86_EFLAGS_AC)) |
| 141 | |
| 142 | /* |
| 143 | * Determines whether a value may be installed in a segment register. |
| 144 | */ |
| 145 | static inline bool invalid_selector(u16 value) |
| 146 | { |
| 147 | return unlikely(value != 0 && (value & SEGMENT_RPL_MASK) != USER_RPL); |
| 148 | } |
| 149 | |
| 150 | #ifdef CONFIG_X86_32 |
| 151 | |
| 152 | #define FLAG_MASK FLAG_MASK_32 |
| 153 | |
| 154 | /* |
| 155 | * X86_32 CPUs don't save ss and esp if the CPU is already in kernel mode |
| 156 | * when it traps. The previous stack will be directly underneath the saved |
| 157 | * registers, and 'sp/ss' won't even have been saved. Thus the '®s->sp'. |
| 158 | * |
| 159 | * Now, if the stack is empty, '®s->sp' is out of range. In this |
| 160 | * case we try to take the previous stack. To always return a non-null |
| 161 | * stack pointer we fall back to regs as stack if no previous stack |
| 162 | * exists. |
| 163 | * |
| 164 | * This is valid only for kernel mode traps. |
| 165 | */ |
| 166 | unsigned long kernel_stack_pointer(struct pt_regs *regs) |
| 167 | { |
| 168 | unsigned long context = (unsigned long)regs & ~(THREAD_SIZE - 1); |
| 169 | unsigned long sp = (unsigned long)®s->sp; |
| 170 | u32 *prev_esp; |
| 171 | |
| 172 | if (context == (sp & ~(THREAD_SIZE - 1))) |
| 173 | return sp; |
| 174 | |
| 175 | prev_esp = (u32 *)(context); |
| 176 | if (prev_esp) |
| 177 | return (unsigned long)prev_esp; |
| 178 | |
| 179 | return (unsigned long)regs; |
| 180 | } |
| 181 | EXPORT_SYMBOL_GPL(kernel_stack_pointer); |
| 182 | |
| 183 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long regno) |
| 184 | { |
| 185 | BUILD_BUG_ON(offsetof(struct pt_regs, bx) != 0); |
| 186 | return ®s->bx + (regno >> 2); |
| 187 | } |
| 188 | |
| 189 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
| 190 | { |
| 191 | /* |
| 192 | * Returning the value truncates it to 16 bits. |
| 193 | */ |
| 194 | unsigned int retval; |
| 195 | if (offset != offsetof(struct user_regs_struct, gs)) |
| 196 | retval = *pt_regs_access(task_pt_regs(task), offset); |
| 197 | else { |
| 198 | if (task == current) |
| 199 | retval = get_user_gs(task_pt_regs(task)); |
| 200 | else |
| 201 | retval = task_user_gs(task); |
| 202 | } |
| 203 | return retval; |
| 204 | } |
| 205 | |
| 206 | static int set_segment_reg(struct task_struct *task, |
| 207 | unsigned long offset, u16 value) |
| 208 | { |
| 209 | /* |
| 210 | * The value argument was already truncated to 16 bits. |
| 211 | */ |
| 212 | if (invalid_selector(value)) |
| 213 | return -EIO; |
| 214 | |
| 215 | /* |
| 216 | * For %cs and %ss we cannot permit a null selector. |
| 217 | * We can permit a bogus selector as long as it has USER_RPL. |
| 218 | * Null selectors are fine for other segment registers, but |
| 219 | * we will never get back to user mode with invalid %cs or %ss |
| 220 | * and will take the trap in iret instead. Much code relies |
| 221 | * on user_mode() to distinguish a user trap frame (which can |
| 222 | * safely use invalid selectors) from a kernel trap frame. |
| 223 | */ |
| 224 | switch (offset) { |
| 225 | case offsetof(struct user_regs_struct, cs): |
| 226 | case offsetof(struct user_regs_struct, ss): |
| 227 | if (unlikely(value == 0)) |
| 228 | return -EIO; |
| 229 | |
| 230 | default: |
| 231 | *pt_regs_access(task_pt_regs(task), offset) = value; |
| 232 | break; |
| 233 | |
| 234 | case offsetof(struct user_regs_struct, gs): |
| 235 | if (task == current) |
| 236 | set_user_gs(task_pt_regs(task), value); |
| 237 | else |
| 238 | task_user_gs(task) = value; |
| 239 | } |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | #else /* CONFIG_X86_64 */ |
| 245 | |
| 246 | #define FLAG_MASK (FLAG_MASK_32 | X86_EFLAGS_NT) |
| 247 | |
| 248 | static unsigned long *pt_regs_access(struct pt_regs *regs, unsigned long offset) |
| 249 | { |
| 250 | BUILD_BUG_ON(offsetof(struct pt_regs, r15) != 0); |
| 251 | return ®s->r15 + (offset / sizeof(regs->r15)); |
| 252 | } |
| 253 | |
| 254 | static u16 get_segment_reg(struct task_struct *task, unsigned long offset) |
| 255 | { |
| 256 | /* |
| 257 | * Returning the value truncates it to 16 bits. |
| 258 | */ |
| 259 | unsigned int seg; |
| 260 | |
| 261 | switch (offset) { |
| 262 | case offsetof(struct user_regs_struct, fs): |
| 263 | if (task == current) { |
| 264 | /* Older gas can't assemble movq %?s,%r?? */ |
| 265 | asm("movl %%fs,%0" : "=r" (seg)); |
| 266 | return seg; |
| 267 | } |
| 268 | return task->thread.fsindex; |
| 269 | case offsetof(struct user_regs_struct, gs): |
| 270 | if (task == current) { |
| 271 | asm("movl %%gs,%0" : "=r" (seg)); |
| 272 | return seg; |
| 273 | } |
| 274 | return task->thread.gsindex; |
| 275 | case offsetof(struct user_regs_struct, ds): |
| 276 | if (task == current) { |
| 277 | asm("movl %%ds,%0" : "=r" (seg)); |
| 278 | return seg; |
| 279 | } |
| 280 | return task->thread.ds; |
| 281 | case offsetof(struct user_regs_struct, es): |
| 282 | if (task == current) { |
| 283 | asm("movl %%es,%0" : "=r" (seg)); |
| 284 | return seg; |
| 285 | } |
| 286 | return task->thread.es; |
| 287 | |
| 288 | case offsetof(struct user_regs_struct, cs): |
| 289 | case offsetof(struct user_regs_struct, ss): |
| 290 | break; |
| 291 | } |
| 292 | return *pt_regs_access(task_pt_regs(task), offset); |
| 293 | } |
| 294 | |
| 295 | static int set_segment_reg(struct task_struct *task, |
| 296 | unsigned long offset, u16 value) |
| 297 | { |
| 298 | /* |
| 299 | * The value argument was already truncated to 16 bits. |
| 300 | */ |
| 301 | if (invalid_selector(value)) |
| 302 | return -EIO; |
| 303 | |
| 304 | switch (offset) { |
| 305 | case offsetof(struct user_regs_struct,fs): |
| 306 | task->thread.fsindex = value; |
| 307 | if (task == current) |
| 308 | loadsegment(fs, task->thread.fsindex); |
| 309 | break; |
| 310 | case offsetof(struct user_regs_struct,gs): |
| 311 | task->thread.gsindex = value; |
| 312 | if (task == current) |
| 313 | load_gs_index(task->thread.gsindex); |
| 314 | break; |
| 315 | case offsetof(struct user_regs_struct,ds): |
| 316 | task->thread.ds = value; |
| 317 | if (task == current) |
| 318 | loadsegment(ds, task->thread.ds); |
| 319 | break; |
| 320 | case offsetof(struct user_regs_struct,es): |
| 321 | task->thread.es = value; |
| 322 | if (task == current) |
| 323 | loadsegment(es, task->thread.es); |
| 324 | break; |
| 325 | |
| 326 | /* |
| 327 | * Can't actually change these in 64-bit mode. |
| 328 | */ |
| 329 | case offsetof(struct user_regs_struct,cs): |
| 330 | if (unlikely(value == 0)) |
| 331 | return -EIO; |
| 332 | task_pt_regs(task)->cs = value; |
| 333 | break; |
| 334 | case offsetof(struct user_regs_struct,ss): |
| 335 | if (unlikely(value == 0)) |
| 336 | return -EIO; |
| 337 | task_pt_regs(task)->ss = value; |
| 338 | break; |
| 339 | } |
| 340 | |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | #endif /* CONFIG_X86_32 */ |
| 345 | |
| 346 | static unsigned long get_flags(struct task_struct *task) |
| 347 | { |
| 348 | unsigned long retval = task_pt_regs(task)->flags; |
| 349 | |
| 350 | /* |
| 351 | * If the debugger set TF, hide it from the readout. |
| 352 | */ |
| 353 | if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
| 354 | retval &= ~X86_EFLAGS_TF; |
| 355 | |
| 356 | return retval; |
| 357 | } |
| 358 | |
| 359 | static int set_flags(struct task_struct *task, unsigned long value) |
| 360 | { |
| 361 | struct pt_regs *regs = task_pt_regs(task); |
| 362 | |
| 363 | /* |
| 364 | * If the user value contains TF, mark that |
| 365 | * it was not "us" (the debugger) that set it. |
| 366 | * If not, make sure it stays set if we had. |
| 367 | */ |
| 368 | if (value & X86_EFLAGS_TF) |
| 369 | clear_tsk_thread_flag(task, TIF_FORCED_TF); |
| 370 | else if (test_tsk_thread_flag(task, TIF_FORCED_TF)) |
| 371 | value |= X86_EFLAGS_TF; |
| 372 | |
| 373 | regs->flags = (regs->flags & ~FLAG_MASK) | (value & FLAG_MASK); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | static int putreg(struct task_struct *child, |
| 379 | unsigned long offset, unsigned long value) |
| 380 | { |
| 381 | switch (offset) { |
| 382 | case offsetof(struct user_regs_struct, cs): |
| 383 | case offsetof(struct user_regs_struct, ds): |
| 384 | case offsetof(struct user_regs_struct, es): |
| 385 | case offsetof(struct user_regs_struct, fs): |
| 386 | case offsetof(struct user_regs_struct, gs): |
| 387 | case offsetof(struct user_regs_struct, ss): |
| 388 | return set_segment_reg(child, offset, value); |
| 389 | |
| 390 | case offsetof(struct user_regs_struct, flags): |
| 391 | return set_flags(child, value); |
| 392 | |
| 393 | #ifdef CONFIG_X86_64 |
| 394 | case offsetof(struct user_regs_struct,fs_base): |
| 395 | if (value >= TASK_SIZE_MAX) |
| 396 | return -EIO; |
| 397 | /* |
| 398 | * When changing the segment base, use do_arch_prctl |
| 399 | * to set either thread.fs or thread.fsindex and the |
| 400 | * corresponding GDT slot. |
| 401 | */ |
| 402 | if (child->thread.fsbase != value) |
| 403 | return do_arch_prctl(child, ARCH_SET_FS, value); |
| 404 | return 0; |
| 405 | case offsetof(struct user_regs_struct,gs_base): |
| 406 | /* |
| 407 | * Exactly the same here as the %fs handling above. |
| 408 | */ |
| 409 | if (value >= TASK_SIZE_MAX) |
| 410 | return -EIO; |
| 411 | if (child->thread.gsbase != value) |
| 412 | return do_arch_prctl(child, ARCH_SET_GS, value); |
| 413 | return 0; |
| 414 | #endif |
| 415 | } |
| 416 | |
| 417 | *pt_regs_access(task_pt_regs(child), offset) = value; |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | static unsigned long getreg(struct task_struct *task, unsigned long offset) |
| 422 | { |
| 423 | switch (offset) { |
| 424 | case offsetof(struct user_regs_struct, cs): |
| 425 | case offsetof(struct user_regs_struct, ds): |
| 426 | case offsetof(struct user_regs_struct, es): |
| 427 | case offsetof(struct user_regs_struct, fs): |
| 428 | case offsetof(struct user_regs_struct, gs): |
| 429 | case offsetof(struct user_regs_struct, ss): |
| 430 | return get_segment_reg(task, offset); |
| 431 | |
| 432 | case offsetof(struct user_regs_struct, flags): |
| 433 | return get_flags(task); |
| 434 | |
| 435 | #ifdef CONFIG_X86_64 |
| 436 | case offsetof(struct user_regs_struct, fs_base): { |
| 437 | /* |
| 438 | * XXX: This will not behave as expected if called on |
| 439 | * current or if fsindex != 0. |
| 440 | */ |
| 441 | return task->thread.fsbase; |
| 442 | } |
| 443 | case offsetof(struct user_regs_struct, gs_base): { |
| 444 | /* |
| 445 | * XXX: This will not behave as expected if called on |
| 446 | * current or if fsindex != 0. |
| 447 | */ |
| 448 | return task->thread.gsbase; |
| 449 | } |
| 450 | #endif |
| 451 | } |
| 452 | |
| 453 | return *pt_regs_access(task_pt_regs(task), offset); |
| 454 | } |
| 455 | |
| 456 | static int genregs_get(struct task_struct *target, |
| 457 | const struct user_regset *regset, |
| 458 | unsigned int pos, unsigned int count, |
| 459 | void *kbuf, void __user *ubuf) |
| 460 | { |
| 461 | if (kbuf) { |
| 462 | unsigned long *k = kbuf; |
| 463 | while (count >= sizeof(*k)) { |
| 464 | *k++ = getreg(target, pos); |
| 465 | count -= sizeof(*k); |
| 466 | pos += sizeof(*k); |
| 467 | } |
| 468 | } else { |
| 469 | unsigned long __user *u = ubuf; |
| 470 | while (count >= sizeof(*u)) { |
| 471 | if (__put_user(getreg(target, pos), u++)) |
| 472 | return -EFAULT; |
| 473 | count -= sizeof(*u); |
| 474 | pos += sizeof(*u); |
| 475 | } |
| 476 | } |
| 477 | |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static int genregs_set(struct task_struct *target, |
| 482 | const struct user_regset *regset, |
| 483 | unsigned int pos, unsigned int count, |
| 484 | const void *kbuf, const void __user *ubuf) |
| 485 | { |
| 486 | int ret = 0; |
| 487 | if (kbuf) { |
| 488 | const unsigned long *k = kbuf; |
| 489 | while (count >= sizeof(*k) && !ret) { |
| 490 | ret = putreg(target, pos, *k++); |
| 491 | count -= sizeof(*k); |
| 492 | pos += sizeof(*k); |
| 493 | } |
| 494 | } else { |
| 495 | const unsigned long __user *u = ubuf; |
| 496 | while (count >= sizeof(*u) && !ret) { |
| 497 | unsigned long word; |
| 498 | ret = __get_user(word, u++); |
| 499 | if (ret) |
| 500 | break; |
| 501 | ret = putreg(target, pos, word); |
| 502 | count -= sizeof(*u); |
| 503 | pos += sizeof(*u); |
| 504 | } |
| 505 | } |
| 506 | return ret; |
| 507 | } |
| 508 | |
| 509 | static void ptrace_triggered(struct perf_event *bp, |
| 510 | struct perf_sample_data *data, |
| 511 | struct pt_regs *regs) |
| 512 | { |
| 513 | int i; |
| 514 | struct thread_struct *thread = &(current->thread); |
| 515 | |
| 516 | /* |
| 517 | * Store in the virtual DR6 register the fact that the breakpoint |
| 518 | * was hit so the thread's debugger will see it. |
| 519 | */ |
| 520 | for (i = 0; i < HBP_NUM; i++) { |
| 521 | if (thread->ptrace_bps[i] == bp) |
| 522 | break; |
| 523 | } |
| 524 | |
| 525 | thread->debugreg6 |= (DR_TRAP0 << i); |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Walk through every ptrace breakpoints for this thread and |
| 530 | * build the dr7 value on top of their attributes. |
| 531 | * |
| 532 | */ |
| 533 | static unsigned long ptrace_get_dr7(struct perf_event *bp[]) |
| 534 | { |
| 535 | int i; |
| 536 | int dr7 = 0; |
| 537 | struct arch_hw_breakpoint *info; |
| 538 | |
| 539 | for (i = 0; i < HBP_NUM; i++) { |
| 540 | if (bp[i] && !bp[i]->attr.disabled) { |
| 541 | info = counter_arch_bp(bp[i]); |
| 542 | dr7 |= encode_dr7(i, info->len, info->type); |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | return dr7; |
| 547 | } |
| 548 | |
| 549 | static int ptrace_fill_bp_fields(struct perf_event_attr *attr, |
| 550 | int len, int type, bool disabled) |
| 551 | { |
| 552 | int err, bp_len, bp_type; |
| 553 | |
| 554 | err = arch_bp_generic_fields(len, type, &bp_len, &bp_type); |
| 555 | if (!err) { |
| 556 | attr->bp_len = bp_len; |
| 557 | attr->bp_type = bp_type; |
| 558 | attr->disabled = disabled; |
| 559 | } |
| 560 | |
| 561 | return err; |
| 562 | } |
| 563 | |
| 564 | static struct perf_event * |
| 565 | ptrace_register_breakpoint(struct task_struct *tsk, int len, int type, |
| 566 | unsigned long addr, bool disabled) |
| 567 | { |
| 568 | struct perf_event_attr attr; |
| 569 | int err; |
| 570 | |
| 571 | ptrace_breakpoint_init(&attr); |
| 572 | attr.bp_addr = addr; |
| 573 | |
| 574 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
| 575 | if (err) |
| 576 | return ERR_PTR(err); |
| 577 | |
| 578 | return register_user_hw_breakpoint(&attr, ptrace_triggered, |
| 579 | NULL, tsk); |
| 580 | } |
| 581 | |
| 582 | static int ptrace_modify_breakpoint(struct perf_event *bp, int len, int type, |
| 583 | int disabled) |
| 584 | { |
| 585 | struct perf_event_attr attr = bp->attr; |
| 586 | int err; |
| 587 | |
| 588 | err = ptrace_fill_bp_fields(&attr, len, type, disabled); |
| 589 | if (err) |
| 590 | return err; |
| 591 | |
| 592 | return modify_user_hw_breakpoint(bp, &attr); |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * Handle ptrace writes to debug register 7. |
| 597 | */ |
| 598 | static int ptrace_write_dr7(struct task_struct *tsk, unsigned long data) |
| 599 | { |
| 600 | struct thread_struct *thread = &tsk->thread; |
| 601 | unsigned long old_dr7; |
| 602 | bool second_pass = false; |
| 603 | int i, rc, ret = 0; |
| 604 | |
| 605 | data &= ~DR_CONTROL_RESERVED; |
| 606 | old_dr7 = ptrace_get_dr7(thread->ptrace_bps); |
| 607 | |
| 608 | restore: |
| 609 | rc = 0; |
| 610 | for (i = 0; i < HBP_NUM; i++) { |
| 611 | unsigned len, type; |
| 612 | bool disabled = !decode_dr7(data, i, &len, &type); |
| 613 | struct perf_event *bp = thread->ptrace_bps[i]; |
| 614 | |
| 615 | if (!bp) { |
| 616 | if (disabled) |
| 617 | continue; |
| 618 | |
| 619 | bp = ptrace_register_breakpoint(tsk, |
| 620 | len, type, 0, disabled); |
| 621 | if (IS_ERR(bp)) { |
| 622 | rc = PTR_ERR(bp); |
| 623 | break; |
| 624 | } |
| 625 | |
| 626 | thread->ptrace_bps[i] = bp; |
| 627 | continue; |
| 628 | } |
| 629 | |
| 630 | rc = ptrace_modify_breakpoint(bp, len, type, disabled); |
| 631 | if (rc) |
| 632 | break; |
| 633 | } |
| 634 | |
| 635 | /* Restore if the first pass failed, second_pass shouldn't fail. */ |
| 636 | if (rc && !WARN_ON(second_pass)) { |
| 637 | ret = rc; |
| 638 | data = old_dr7; |
| 639 | second_pass = true; |
| 640 | goto restore; |
| 641 | } |
| 642 | |
| 643 | return ret; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * Handle PTRACE_PEEKUSR calls for the debug register area. |
| 648 | */ |
| 649 | static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n) |
| 650 | { |
| 651 | struct thread_struct *thread = &tsk->thread; |
| 652 | unsigned long val = 0; |
| 653 | |
| 654 | if (n < HBP_NUM) { |
| 655 | struct perf_event *bp = thread->ptrace_bps[n]; |
| 656 | |
| 657 | if (bp) |
| 658 | val = bp->hw.info.address; |
| 659 | } else if (n == 6) { |
| 660 | val = thread->debugreg6; |
| 661 | } else if (n == 7) { |
| 662 | val = thread->ptrace_dr7; |
| 663 | } |
| 664 | return val; |
| 665 | } |
| 666 | |
| 667 | static int ptrace_set_breakpoint_addr(struct task_struct *tsk, int nr, |
| 668 | unsigned long addr) |
| 669 | { |
| 670 | struct thread_struct *t = &tsk->thread; |
| 671 | struct perf_event *bp = t->ptrace_bps[nr]; |
| 672 | int err = 0; |
| 673 | |
| 674 | if (!bp) { |
| 675 | /* |
| 676 | * Put stub len and type to create an inactive but correct bp. |
| 677 | * |
| 678 | * CHECKME: the previous code returned -EIO if the addr wasn't |
| 679 | * a valid task virtual addr. The new one will return -EINVAL in |
| 680 | * this case. |
| 681 | * -EINVAL may be what we want for in-kernel breakpoints users, |
| 682 | * but -EIO looks better for ptrace, since we refuse a register |
| 683 | * writing for the user. And anyway this is the previous |
| 684 | * behaviour. |
| 685 | */ |
| 686 | bp = ptrace_register_breakpoint(tsk, |
| 687 | X86_BREAKPOINT_LEN_1, X86_BREAKPOINT_WRITE, |
| 688 | addr, true); |
| 689 | if (IS_ERR(bp)) |
| 690 | err = PTR_ERR(bp); |
| 691 | else |
| 692 | t->ptrace_bps[nr] = bp; |
| 693 | } else { |
| 694 | struct perf_event_attr attr = bp->attr; |
| 695 | |
| 696 | attr.bp_addr = addr; |
| 697 | err = modify_user_hw_breakpoint(bp, &attr); |
| 698 | } |
| 699 | |
| 700 | return err; |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Handle PTRACE_POKEUSR calls for the debug register area. |
| 705 | */ |
| 706 | static int ptrace_set_debugreg(struct task_struct *tsk, int n, |
| 707 | unsigned long val) |
| 708 | { |
| 709 | struct thread_struct *thread = &tsk->thread; |
| 710 | /* There are no DR4 or DR5 registers */ |
| 711 | int rc = -EIO; |
| 712 | |
| 713 | if (n < HBP_NUM) { |
| 714 | rc = ptrace_set_breakpoint_addr(tsk, n, val); |
| 715 | } else if (n == 6) { |
| 716 | thread->debugreg6 = val; |
| 717 | rc = 0; |
| 718 | } else if (n == 7) { |
| 719 | rc = ptrace_write_dr7(tsk, val); |
| 720 | if (!rc) |
| 721 | thread->ptrace_dr7 = val; |
| 722 | } |
| 723 | return rc; |
| 724 | } |
| 725 | |
| 726 | /* |
| 727 | * These access the current or another (stopped) task's io permission |
| 728 | * bitmap for debugging or core dump. |
| 729 | */ |
| 730 | static int ioperm_active(struct task_struct *target, |
| 731 | const struct user_regset *regset) |
| 732 | { |
| 733 | return target->thread.io_bitmap_max / regset->size; |
| 734 | } |
| 735 | |
| 736 | static int ioperm_get(struct task_struct *target, |
| 737 | const struct user_regset *regset, |
| 738 | unsigned int pos, unsigned int count, |
| 739 | void *kbuf, void __user *ubuf) |
| 740 | { |
| 741 | if (!target->thread.io_bitmap_ptr) |
| 742 | return -ENXIO; |
| 743 | |
| 744 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 745 | target->thread.io_bitmap_ptr, |
| 746 | 0, IO_BITMAP_BYTES); |
| 747 | } |
| 748 | |
| 749 | /* |
| 750 | * Called by kernel/ptrace.c when detaching.. |
| 751 | * |
| 752 | * Make sure the single step bit is not set. |
| 753 | */ |
| 754 | void ptrace_disable(struct task_struct *child) |
| 755 | { |
| 756 | user_disable_single_step(child); |
| 757 | #ifdef TIF_SYSCALL_EMU |
| 758 | clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); |
| 759 | #endif |
| 760 | } |
| 761 | |
| 762 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 763 | static const struct user_regset_view user_x86_32_view; /* Initialized below. */ |
| 764 | #endif |
| 765 | |
| 766 | long arch_ptrace(struct task_struct *child, long request, |
| 767 | unsigned long addr, unsigned long data) |
| 768 | { |
| 769 | int ret; |
| 770 | unsigned long __user *datap = (unsigned long __user *)data; |
| 771 | |
| 772 | switch (request) { |
| 773 | /* read the word at location addr in the USER area. */ |
| 774 | case PTRACE_PEEKUSR: { |
| 775 | unsigned long tmp; |
| 776 | |
| 777 | ret = -EIO; |
| 778 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
| 779 | break; |
| 780 | |
| 781 | tmp = 0; /* Default return condition */ |
| 782 | if (addr < sizeof(struct user_regs_struct)) |
| 783 | tmp = getreg(child, addr); |
| 784 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| 785 | addr <= offsetof(struct user, u_debugreg[7])) { |
| 786 | addr -= offsetof(struct user, u_debugreg[0]); |
| 787 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); |
| 788 | } |
| 789 | ret = put_user(tmp, datap); |
| 790 | break; |
| 791 | } |
| 792 | |
| 793 | case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ |
| 794 | ret = -EIO; |
| 795 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user)) |
| 796 | break; |
| 797 | |
| 798 | if (addr < sizeof(struct user_regs_struct)) |
| 799 | ret = putreg(child, addr, data); |
| 800 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| 801 | addr <= offsetof(struct user, u_debugreg[7])) { |
| 802 | addr -= offsetof(struct user, u_debugreg[0]); |
| 803 | ret = ptrace_set_debugreg(child, |
| 804 | addr / sizeof(data), data); |
| 805 | } |
| 806 | break; |
| 807 | |
| 808 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| 809 | return copy_regset_to_user(child, |
| 810 | task_user_regset_view(current), |
| 811 | REGSET_GENERAL, |
| 812 | 0, sizeof(struct user_regs_struct), |
| 813 | datap); |
| 814 | |
| 815 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| 816 | return copy_regset_from_user(child, |
| 817 | task_user_regset_view(current), |
| 818 | REGSET_GENERAL, |
| 819 | 0, sizeof(struct user_regs_struct), |
| 820 | datap); |
| 821 | |
| 822 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| 823 | return copy_regset_to_user(child, |
| 824 | task_user_regset_view(current), |
| 825 | REGSET_FP, |
| 826 | 0, sizeof(struct user_i387_struct), |
| 827 | datap); |
| 828 | |
| 829 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| 830 | return copy_regset_from_user(child, |
| 831 | task_user_regset_view(current), |
| 832 | REGSET_FP, |
| 833 | 0, sizeof(struct user_i387_struct), |
| 834 | datap); |
| 835 | |
| 836 | #ifdef CONFIG_X86_32 |
| 837 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
| 838 | return copy_regset_to_user(child, &user_x86_32_view, |
| 839 | REGSET_XFP, |
| 840 | 0, sizeof(struct user_fxsr_struct), |
| 841 | datap) ? -EIO : 0; |
| 842 | |
| 843 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
| 844 | return copy_regset_from_user(child, &user_x86_32_view, |
| 845 | REGSET_XFP, |
| 846 | 0, sizeof(struct user_fxsr_struct), |
| 847 | datap) ? -EIO : 0; |
| 848 | #endif |
| 849 | |
| 850 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 851 | case PTRACE_GET_THREAD_AREA: |
| 852 | if ((int) addr < 0) |
| 853 | return -EIO; |
| 854 | ret = do_get_thread_area(child, addr, |
| 855 | (struct user_desc __user *)data); |
| 856 | break; |
| 857 | |
| 858 | case PTRACE_SET_THREAD_AREA: |
| 859 | if ((int) addr < 0) |
| 860 | return -EIO; |
| 861 | ret = do_set_thread_area(child, addr, |
| 862 | (struct user_desc __user *)data, 0); |
| 863 | break; |
| 864 | #endif |
| 865 | |
| 866 | #ifdef CONFIG_X86_64 |
| 867 | /* normal 64bit interface to access TLS data. |
| 868 | Works just like arch_prctl, except that the arguments |
| 869 | are reversed. */ |
| 870 | case PTRACE_ARCH_PRCTL: |
| 871 | ret = do_arch_prctl(child, data, addr); |
| 872 | break; |
| 873 | #endif |
| 874 | |
| 875 | default: |
| 876 | ret = ptrace_request(child, request, addr, data); |
| 877 | break; |
| 878 | } |
| 879 | |
| 880 | return ret; |
| 881 | } |
| 882 | |
| 883 | #ifdef CONFIG_IA32_EMULATION |
| 884 | |
| 885 | #include <linux/compat.h> |
| 886 | #include <linux/syscalls.h> |
| 887 | #include <asm/ia32.h> |
| 888 | #include <asm/user32.h> |
| 889 | |
| 890 | #define R32(l,q) \ |
| 891 | case offsetof(struct user32, regs.l): \ |
| 892 | regs->q = value; break |
| 893 | |
| 894 | #define SEG32(rs) \ |
| 895 | case offsetof(struct user32, regs.rs): \ |
| 896 | return set_segment_reg(child, \ |
| 897 | offsetof(struct user_regs_struct, rs), \ |
| 898 | value); \ |
| 899 | break |
| 900 | |
| 901 | static int putreg32(struct task_struct *child, unsigned regno, u32 value) |
| 902 | { |
| 903 | struct pt_regs *regs = task_pt_regs(child); |
| 904 | |
| 905 | switch (regno) { |
| 906 | |
| 907 | SEG32(cs); |
| 908 | SEG32(ds); |
| 909 | SEG32(es); |
| 910 | SEG32(fs); |
| 911 | SEG32(gs); |
| 912 | SEG32(ss); |
| 913 | |
| 914 | R32(ebx, bx); |
| 915 | R32(ecx, cx); |
| 916 | R32(edx, dx); |
| 917 | R32(edi, di); |
| 918 | R32(esi, si); |
| 919 | R32(ebp, bp); |
| 920 | R32(eax, ax); |
| 921 | R32(eip, ip); |
| 922 | R32(esp, sp); |
| 923 | |
| 924 | case offsetof(struct user32, regs.orig_eax): |
| 925 | /* |
| 926 | * Warning: bizarre corner case fixup here. A 32-bit |
| 927 | * debugger setting orig_eax to -1 wants to disable |
| 928 | * syscall restart. Make sure that the syscall |
| 929 | * restart code sign-extends orig_ax. Also make sure |
| 930 | * we interpret the -ERESTART* codes correctly if |
| 931 | * loaded into regs->ax in case the task is not |
| 932 | * actually still sitting at the exit from a 32-bit |
| 933 | * syscall with TS_COMPAT still set. |
| 934 | */ |
| 935 | regs->orig_ax = value; |
| 936 | if (syscall_get_nr(child, regs) >= 0) |
| 937 | task_thread_info(child)->status |= TS_I386_REGS_POKED; |
| 938 | break; |
| 939 | |
| 940 | case offsetof(struct user32, regs.eflags): |
| 941 | return set_flags(child, value); |
| 942 | |
| 943 | case offsetof(struct user32, u_debugreg[0]) ... |
| 944 | offsetof(struct user32, u_debugreg[7]): |
| 945 | regno -= offsetof(struct user32, u_debugreg[0]); |
| 946 | return ptrace_set_debugreg(child, regno / 4, value); |
| 947 | |
| 948 | default: |
| 949 | if (regno > sizeof(struct user32) || (regno & 3)) |
| 950 | return -EIO; |
| 951 | |
| 952 | /* |
| 953 | * Other dummy fields in the virtual user structure |
| 954 | * are ignored |
| 955 | */ |
| 956 | break; |
| 957 | } |
| 958 | return 0; |
| 959 | } |
| 960 | |
| 961 | #undef R32 |
| 962 | #undef SEG32 |
| 963 | |
| 964 | #define R32(l,q) \ |
| 965 | case offsetof(struct user32, regs.l): \ |
| 966 | *val = regs->q; break |
| 967 | |
| 968 | #define SEG32(rs) \ |
| 969 | case offsetof(struct user32, regs.rs): \ |
| 970 | *val = get_segment_reg(child, \ |
| 971 | offsetof(struct user_regs_struct, rs)); \ |
| 972 | break |
| 973 | |
| 974 | static int getreg32(struct task_struct *child, unsigned regno, u32 *val) |
| 975 | { |
| 976 | struct pt_regs *regs = task_pt_regs(child); |
| 977 | |
| 978 | switch (regno) { |
| 979 | |
| 980 | SEG32(ds); |
| 981 | SEG32(es); |
| 982 | SEG32(fs); |
| 983 | SEG32(gs); |
| 984 | |
| 985 | R32(cs, cs); |
| 986 | R32(ss, ss); |
| 987 | R32(ebx, bx); |
| 988 | R32(ecx, cx); |
| 989 | R32(edx, dx); |
| 990 | R32(edi, di); |
| 991 | R32(esi, si); |
| 992 | R32(ebp, bp); |
| 993 | R32(eax, ax); |
| 994 | R32(orig_eax, orig_ax); |
| 995 | R32(eip, ip); |
| 996 | R32(esp, sp); |
| 997 | |
| 998 | case offsetof(struct user32, regs.eflags): |
| 999 | *val = get_flags(child); |
| 1000 | break; |
| 1001 | |
| 1002 | case offsetof(struct user32, u_debugreg[0]) ... |
| 1003 | offsetof(struct user32, u_debugreg[7]): |
| 1004 | regno -= offsetof(struct user32, u_debugreg[0]); |
| 1005 | *val = ptrace_get_debugreg(child, regno / 4); |
| 1006 | break; |
| 1007 | |
| 1008 | default: |
| 1009 | if (regno > sizeof(struct user32) || (regno & 3)) |
| 1010 | return -EIO; |
| 1011 | |
| 1012 | /* |
| 1013 | * Other dummy fields in the virtual user structure |
| 1014 | * are ignored |
| 1015 | */ |
| 1016 | *val = 0; |
| 1017 | break; |
| 1018 | } |
| 1019 | return 0; |
| 1020 | } |
| 1021 | |
| 1022 | #undef R32 |
| 1023 | #undef SEG32 |
| 1024 | |
| 1025 | static int genregs32_get(struct task_struct *target, |
| 1026 | const struct user_regset *regset, |
| 1027 | unsigned int pos, unsigned int count, |
| 1028 | void *kbuf, void __user *ubuf) |
| 1029 | { |
| 1030 | if (kbuf) { |
| 1031 | compat_ulong_t *k = kbuf; |
| 1032 | while (count >= sizeof(*k)) { |
| 1033 | getreg32(target, pos, k++); |
| 1034 | count -= sizeof(*k); |
| 1035 | pos += sizeof(*k); |
| 1036 | } |
| 1037 | } else { |
| 1038 | compat_ulong_t __user *u = ubuf; |
| 1039 | while (count >= sizeof(*u)) { |
| 1040 | compat_ulong_t word; |
| 1041 | getreg32(target, pos, &word); |
| 1042 | if (__put_user(word, u++)) |
| 1043 | return -EFAULT; |
| 1044 | count -= sizeof(*u); |
| 1045 | pos += sizeof(*u); |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | return 0; |
| 1050 | } |
| 1051 | |
| 1052 | static int genregs32_set(struct task_struct *target, |
| 1053 | const struct user_regset *regset, |
| 1054 | unsigned int pos, unsigned int count, |
| 1055 | const void *kbuf, const void __user *ubuf) |
| 1056 | { |
| 1057 | int ret = 0; |
| 1058 | if (kbuf) { |
| 1059 | const compat_ulong_t *k = kbuf; |
| 1060 | while (count >= sizeof(*k) && !ret) { |
| 1061 | ret = putreg32(target, pos, *k++); |
| 1062 | count -= sizeof(*k); |
| 1063 | pos += sizeof(*k); |
| 1064 | } |
| 1065 | } else { |
| 1066 | const compat_ulong_t __user *u = ubuf; |
| 1067 | while (count >= sizeof(*u) && !ret) { |
| 1068 | compat_ulong_t word; |
| 1069 | ret = __get_user(word, u++); |
| 1070 | if (ret) |
| 1071 | break; |
| 1072 | ret = putreg32(target, pos, word); |
| 1073 | count -= sizeof(*u); |
| 1074 | pos += sizeof(*u); |
| 1075 | } |
| 1076 | } |
| 1077 | return ret; |
| 1078 | } |
| 1079 | |
| 1080 | static long ia32_arch_ptrace(struct task_struct *child, compat_long_t request, |
| 1081 | compat_ulong_t caddr, compat_ulong_t cdata) |
| 1082 | { |
| 1083 | unsigned long addr = caddr; |
| 1084 | unsigned long data = cdata; |
| 1085 | void __user *datap = compat_ptr(data); |
| 1086 | int ret; |
| 1087 | __u32 val; |
| 1088 | |
| 1089 | switch (request) { |
| 1090 | case PTRACE_PEEKUSR: |
| 1091 | ret = getreg32(child, addr, &val); |
| 1092 | if (ret == 0) |
| 1093 | ret = put_user(val, (__u32 __user *)datap); |
| 1094 | break; |
| 1095 | |
| 1096 | case PTRACE_POKEUSR: |
| 1097 | ret = putreg32(child, addr, data); |
| 1098 | break; |
| 1099 | |
| 1100 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| 1101 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1102 | REGSET_GENERAL, |
| 1103 | 0, sizeof(struct user_regs_struct32), |
| 1104 | datap); |
| 1105 | |
| 1106 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| 1107 | return copy_regset_from_user(child, &user_x86_32_view, |
| 1108 | REGSET_GENERAL, 0, |
| 1109 | sizeof(struct user_regs_struct32), |
| 1110 | datap); |
| 1111 | |
| 1112 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| 1113 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1114 | REGSET_FP, 0, |
| 1115 | sizeof(struct user_i387_ia32_struct), |
| 1116 | datap); |
| 1117 | |
| 1118 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| 1119 | return copy_regset_from_user( |
| 1120 | child, &user_x86_32_view, REGSET_FP, |
| 1121 | 0, sizeof(struct user_i387_ia32_struct), datap); |
| 1122 | |
| 1123 | case PTRACE_GETFPXREGS: /* Get the child extended FPU state. */ |
| 1124 | return copy_regset_to_user(child, &user_x86_32_view, |
| 1125 | REGSET_XFP, 0, |
| 1126 | sizeof(struct user32_fxsr_struct), |
| 1127 | datap); |
| 1128 | |
| 1129 | case PTRACE_SETFPXREGS: /* Set the child extended FPU state. */ |
| 1130 | return copy_regset_from_user(child, &user_x86_32_view, |
| 1131 | REGSET_XFP, 0, |
| 1132 | sizeof(struct user32_fxsr_struct), |
| 1133 | datap); |
| 1134 | |
| 1135 | case PTRACE_GET_THREAD_AREA: |
| 1136 | case PTRACE_SET_THREAD_AREA: |
| 1137 | return arch_ptrace(child, request, addr, data); |
| 1138 | |
| 1139 | default: |
| 1140 | return compat_ptrace_request(child, request, addr, data); |
| 1141 | } |
| 1142 | |
| 1143 | return ret; |
| 1144 | } |
| 1145 | #endif /* CONFIG_IA32_EMULATION */ |
| 1146 | |
| 1147 | #ifdef CONFIG_X86_X32_ABI |
| 1148 | static long x32_arch_ptrace(struct task_struct *child, |
| 1149 | compat_long_t request, compat_ulong_t caddr, |
| 1150 | compat_ulong_t cdata) |
| 1151 | { |
| 1152 | unsigned long addr = caddr; |
| 1153 | unsigned long data = cdata; |
| 1154 | void __user *datap = compat_ptr(data); |
| 1155 | int ret; |
| 1156 | |
| 1157 | switch (request) { |
| 1158 | /* Read 32bits at location addr in the USER area. Only allow |
| 1159 | to return the lower 32bits of segment and debug registers. */ |
| 1160 | case PTRACE_PEEKUSR: { |
| 1161 | u32 tmp; |
| 1162 | |
| 1163 | ret = -EIO; |
| 1164 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || |
| 1165 | addr < offsetof(struct user_regs_struct, cs)) |
| 1166 | break; |
| 1167 | |
| 1168 | tmp = 0; /* Default return condition */ |
| 1169 | if (addr < sizeof(struct user_regs_struct)) |
| 1170 | tmp = getreg(child, addr); |
| 1171 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| 1172 | addr <= offsetof(struct user, u_debugreg[7])) { |
| 1173 | addr -= offsetof(struct user, u_debugreg[0]); |
| 1174 | tmp = ptrace_get_debugreg(child, addr / sizeof(data)); |
| 1175 | } |
| 1176 | ret = put_user(tmp, (__u32 __user *)datap); |
| 1177 | break; |
| 1178 | } |
| 1179 | |
| 1180 | /* Write the word at location addr in the USER area. Only allow |
| 1181 | to update segment and debug registers with the upper 32bits |
| 1182 | zero-extended. */ |
| 1183 | case PTRACE_POKEUSR: |
| 1184 | ret = -EIO; |
| 1185 | if ((addr & (sizeof(data) - 1)) || addr >= sizeof(struct user) || |
| 1186 | addr < offsetof(struct user_regs_struct, cs)) |
| 1187 | break; |
| 1188 | |
| 1189 | if (addr < sizeof(struct user_regs_struct)) |
| 1190 | ret = putreg(child, addr, data); |
| 1191 | else if (addr >= offsetof(struct user, u_debugreg[0]) && |
| 1192 | addr <= offsetof(struct user, u_debugreg[7])) { |
| 1193 | addr -= offsetof(struct user, u_debugreg[0]); |
| 1194 | ret = ptrace_set_debugreg(child, |
| 1195 | addr / sizeof(data), data); |
| 1196 | } |
| 1197 | break; |
| 1198 | |
| 1199 | case PTRACE_GETREGS: /* Get all gp regs from the child. */ |
| 1200 | return copy_regset_to_user(child, |
| 1201 | task_user_regset_view(current), |
| 1202 | REGSET_GENERAL, |
| 1203 | 0, sizeof(struct user_regs_struct), |
| 1204 | datap); |
| 1205 | |
| 1206 | case PTRACE_SETREGS: /* Set all gp regs in the child. */ |
| 1207 | return copy_regset_from_user(child, |
| 1208 | task_user_regset_view(current), |
| 1209 | REGSET_GENERAL, |
| 1210 | 0, sizeof(struct user_regs_struct), |
| 1211 | datap); |
| 1212 | |
| 1213 | case PTRACE_GETFPREGS: /* Get the child FPU state. */ |
| 1214 | return copy_regset_to_user(child, |
| 1215 | task_user_regset_view(current), |
| 1216 | REGSET_FP, |
| 1217 | 0, sizeof(struct user_i387_struct), |
| 1218 | datap); |
| 1219 | |
| 1220 | case PTRACE_SETFPREGS: /* Set the child FPU state. */ |
| 1221 | return copy_regset_from_user(child, |
| 1222 | task_user_regset_view(current), |
| 1223 | REGSET_FP, |
| 1224 | 0, sizeof(struct user_i387_struct), |
| 1225 | datap); |
| 1226 | |
| 1227 | default: |
| 1228 | return compat_ptrace_request(child, request, addr, data); |
| 1229 | } |
| 1230 | |
| 1231 | return ret; |
| 1232 | } |
| 1233 | #endif |
| 1234 | |
| 1235 | #ifdef CONFIG_COMPAT |
| 1236 | long compat_arch_ptrace(struct task_struct *child, compat_long_t request, |
| 1237 | compat_ulong_t caddr, compat_ulong_t cdata) |
| 1238 | { |
| 1239 | #ifdef CONFIG_X86_X32_ABI |
| 1240 | if (!in_ia32_syscall()) |
| 1241 | return x32_arch_ptrace(child, request, caddr, cdata); |
| 1242 | #endif |
| 1243 | #ifdef CONFIG_IA32_EMULATION |
| 1244 | return ia32_arch_ptrace(child, request, caddr, cdata); |
| 1245 | #else |
| 1246 | return 0; |
| 1247 | #endif |
| 1248 | } |
| 1249 | #endif /* CONFIG_COMPAT */ |
| 1250 | |
| 1251 | #ifdef CONFIG_X86_64 |
| 1252 | |
| 1253 | static struct user_regset x86_64_regsets[] __read_mostly = { |
| 1254 | [REGSET_GENERAL] = { |
| 1255 | .core_note_type = NT_PRSTATUS, |
| 1256 | .n = sizeof(struct user_regs_struct) / sizeof(long), |
| 1257 | .size = sizeof(long), .align = sizeof(long), |
| 1258 | .get = genregs_get, .set = genregs_set |
| 1259 | }, |
| 1260 | [REGSET_FP] = { |
| 1261 | .core_note_type = NT_PRFPREG, |
| 1262 | .n = sizeof(struct user_i387_struct) / sizeof(long), |
| 1263 | .size = sizeof(long), .align = sizeof(long), |
| 1264 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
| 1265 | }, |
| 1266 | [REGSET_XSTATE] = { |
| 1267 | .core_note_type = NT_X86_XSTATE, |
| 1268 | .size = sizeof(u64), .align = sizeof(u64), |
| 1269 | .active = xstateregs_active, .get = xstateregs_get, |
| 1270 | .set = xstateregs_set |
| 1271 | }, |
| 1272 | [REGSET_IOPERM64] = { |
| 1273 | .core_note_type = NT_386_IOPERM, |
| 1274 | .n = IO_BITMAP_LONGS, |
| 1275 | .size = sizeof(long), .align = sizeof(long), |
| 1276 | .active = ioperm_active, .get = ioperm_get |
| 1277 | }, |
| 1278 | }; |
| 1279 | |
| 1280 | static const struct user_regset_view user_x86_64_view = { |
| 1281 | .name = "x86_64", .e_machine = EM_X86_64, |
| 1282 | .regsets = x86_64_regsets, .n = ARRAY_SIZE(x86_64_regsets) |
| 1283 | }; |
| 1284 | |
| 1285 | #else /* CONFIG_X86_32 */ |
| 1286 | |
| 1287 | #define user_regs_struct32 user_regs_struct |
| 1288 | #define genregs32_get genregs_get |
| 1289 | #define genregs32_set genregs_set |
| 1290 | |
| 1291 | #endif /* CONFIG_X86_64 */ |
| 1292 | |
| 1293 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 1294 | static struct user_regset x86_32_regsets[] __read_mostly = { |
| 1295 | [REGSET_GENERAL] = { |
| 1296 | .core_note_type = NT_PRSTATUS, |
| 1297 | .n = sizeof(struct user_regs_struct32) / sizeof(u32), |
| 1298 | .size = sizeof(u32), .align = sizeof(u32), |
| 1299 | .get = genregs32_get, .set = genregs32_set |
| 1300 | }, |
| 1301 | [REGSET_FP] = { |
| 1302 | .core_note_type = NT_PRFPREG, |
| 1303 | .n = sizeof(struct user_i387_ia32_struct) / sizeof(u32), |
| 1304 | .size = sizeof(u32), .align = sizeof(u32), |
| 1305 | .active = regset_fpregs_active, .get = fpregs_get, .set = fpregs_set |
| 1306 | }, |
| 1307 | [REGSET_XFP] = { |
| 1308 | .core_note_type = NT_PRXFPREG, |
| 1309 | .n = sizeof(struct user32_fxsr_struct) / sizeof(u32), |
| 1310 | .size = sizeof(u32), .align = sizeof(u32), |
| 1311 | .active = regset_xregset_fpregs_active, .get = xfpregs_get, .set = xfpregs_set |
| 1312 | }, |
| 1313 | [REGSET_XSTATE] = { |
| 1314 | .core_note_type = NT_X86_XSTATE, |
| 1315 | .size = sizeof(u64), .align = sizeof(u64), |
| 1316 | .active = xstateregs_active, .get = xstateregs_get, |
| 1317 | .set = xstateregs_set |
| 1318 | }, |
| 1319 | [REGSET_TLS] = { |
| 1320 | .core_note_type = NT_386_TLS, |
| 1321 | .n = GDT_ENTRY_TLS_ENTRIES, .bias = GDT_ENTRY_TLS_MIN, |
| 1322 | .size = sizeof(struct user_desc), |
| 1323 | .align = sizeof(struct user_desc), |
| 1324 | .active = regset_tls_active, |
| 1325 | .get = regset_tls_get, .set = regset_tls_set |
| 1326 | }, |
| 1327 | [REGSET_IOPERM32] = { |
| 1328 | .core_note_type = NT_386_IOPERM, |
| 1329 | .n = IO_BITMAP_BYTES / sizeof(u32), |
| 1330 | .size = sizeof(u32), .align = sizeof(u32), |
| 1331 | .active = ioperm_active, .get = ioperm_get |
| 1332 | }, |
| 1333 | }; |
| 1334 | |
| 1335 | static const struct user_regset_view user_x86_32_view = { |
| 1336 | .name = "i386", .e_machine = EM_386, |
| 1337 | .regsets = x86_32_regsets, .n = ARRAY_SIZE(x86_32_regsets) |
| 1338 | }; |
| 1339 | #endif |
| 1340 | |
| 1341 | /* |
| 1342 | * This represents bytes 464..511 in the memory layout exported through |
| 1343 | * the REGSET_XSTATE interface. |
| 1344 | */ |
| 1345 | u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; |
| 1346 | |
| 1347 | void update_regset_xstate_info(unsigned int size, u64 xstate_mask) |
| 1348 | { |
| 1349 | #ifdef CONFIG_X86_64 |
| 1350 | x86_64_regsets[REGSET_XSTATE].n = size / sizeof(u64); |
| 1351 | #endif |
| 1352 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 1353 | x86_32_regsets[REGSET_XSTATE].n = size / sizeof(u64); |
| 1354 | #endif |
| 1355 | xstate_fx_sw_bytes[USER_XSTATE_XCR0_WORD] = xstate_mask; |
| 1356 | } |
| 1357 | |
| 1358 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| 1359 | { |
| 1360 | #ifdef CONFIG_IA32_EMULATION |
| 1361 | if (test_tsk_thread_flag(task, TIF_IA32)) |
| 1362 | #endif |
| 1363 | #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION |
| 1364 | return &user_x86_32_view; |
| 1365 | #endif |
| 1366 | #ifdef CONFIG_X86_64 |
| 1367 | return &user_x86_64_view; |
| 1368 | #endif |
| 1369 | } |
| 1370 | |
| 1371 | static void fill_sigtrap_info(struct task_struct *tsk, |
| 1372 | struct pt_regs *regs, |
| 1373 | int error_code, int si_code, |
| 1374 | struct siginfo *info) |
| 1375 | { |
| 1376 | tsk->thread.trap_nr = X86_TRAP_DB; |
| 1377 | tsk->thread.error_code = error_code; |
| 1378 | |
| 1379 | memset(info, 0, sizeof(*info)); |
| 1380 | info->si_signo = SIGTRAP; |
| 1381 | info->si_code = si_code; |
| 1382 | info->si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
| 1383 | } |
| 1384 | |
| 1385 | void user_single_step_siginfo(struct task_struct *tsk, |
| 1386 | struct pt_regs *regs, |
| 1387 | struct siginfo *info) |
| 1388 | { |
| 1389 | fill_sigtrap_info(tsk, regs, 0, TRAP_BRKPT, info); |
| 1390 | } |
| 1391 | |
| 1392 | void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, |
| 1393 | int error_code, int si_code) |
| 1394 | { |
| 1395 | struct siginfo info; |
| 1396 | |
| 1397 | fill_sigtrap_info(tsk, regs, error_code, si_code, &info); |
| 1398 | /* Send us the fake SIGTRAP */ |
| 1399 | force_sig_info(SIGTRAP, &info, tsk); |
| 1400 | } |