1 /* 2 * Based on arch/arm/kernel/signal.c 3 * 4 * Copyright (C) 1995-2009 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <linux/compat.h> 21 #include <linux/errno.h> 22 #include <linux/kernel.h> 23 #include <linux/signal.h> 24 #include <linux/personality.h> 25 #include <linux/freezer.h> 26 #include <linux/stddef.h> 27 #include <linux/uaccess.h> 28 #include <linux/sizes.h> 29 #include <linux/string.h> 30 #include <linux/tracehook.h> 31 #include <linux/ratelimit.h> 32 33 #include <asm/debug-monitors.h> 34 #include <asm/elf.h> 35 #include <asm/cacheflush.h> 36 #include <asm/ucontext.h> 37 #include <asm/unistd.h> 38 #include <asm/fpsimd.h> 39 #include <asm/signal32.h> 40 #include <asm/vdso.h> 41 42 /* 43 * Do a signal return; undo the signal stack. These are aligned to 128-bit. 44 */ 45 struct rt_sigframe { 46 struct siginfo info; 47 struct ucontext uc; 48 }; 49 50 struct frame_record { 51 u64 fp; 52 u64 lr; 53 }; 54 55 struct rt_sigframe_user_layout { 56 struct rt_sigframe __user *sigframe; 57 struct frame_record __user *next_frame; 58 59 unsigned long size; /* size of allocated sigframe data */ 60 unsigned long limit; /* largest allowed size */ 61 62 unsigned long fpsimd_offset; 63 unsigned long esr_offset; 64 unsigned long extra_offset; 65 unsigned long end_offset; 66 }; 67 68 #define BASE_SIGFRAME_SIZE round_up(sizeof(struct rt_sigframe), 16) 69 #define TERMINATOR_SIZE round_up(sizeof(struct _aarch64_ctx), 16) 70 #define EXTRA_CONTEXT_SIZE round_up(sizeof(struct extra_context), 16) 71 72 static void init_user_layout(struct rt_sigframe_user_layout *user) 73 { 74 const size_t reserved_size = 75 sizeof(user->sigframe->uc.uc_mcontext.__reserved); 76 77 memset(user, 0, sizeof(*user)); 78 user->size = offsetof(struct rt_sigframe, uc.uc_mcontext.__reserved); 79 80 user->limit = user->size + reserved_size; 81 82 user->limit -= TERMINATOR_SIZE; 83 user->limit -= EXTRA_CONTEXT_SIZE; 84 /* Reserve space for extension and terminator ^ */ 85 } 86 87 static size_t sigframe_size(struct rt_sigframe_user_layout const *user) 88 { 89 return round_up(max(user->size, sizeof(struct rt_sigframe)), 16); 90 } 91 92 /* 93 * Sanity limit on the approximate maximum size of signal frame we'll 94 * try to generate. Stack alignment padding and the frame record are 95 * not taken into account. This limit is not a guarantee and is 96 * NOT ABI. 97 */ 98 #define SIGFRAME_MAXSZ SZ_64K 99 100 static int __sigframe_alloc(struct rt_sigframe_user_layout *user, 101 unsigned long *offset, size_t size, bool extend) 102 { 103 size_t padded_size = round_up(size, 16); 104 105 if (padded_size > user->limit - user->size && 106 !user->extra_offset && 107 extend) { 108 int ret; 109 110 user->limit += EXTRA_CONTEXT_SIZE; 111 ret = __sigframe_alloc(user, &user->extra_offset, 112 sizeof(struct extra_context), false); 113 if (ret) { 114 user->limit -= EXTRA_CONTEXT_SIZE; 115 return ret; 116 } 117 118 /* Reserve space for the __reserved[] terminator */ 119 user->size += TERMINATOR_SIZE; 120 121 /* 122 * Allow expansion up to SIGFRAME_MAXSZ, ensuring space for 123 * the terminator: 124 */ 125 user->limit = SIGFRAME_MAXSZ - TERMINATOR_SIZE; 126 } 127 128 /* Still not enough space? Bad luck! */ 129 if (padded_size > user->limit - user->size) 130 return -ENOMEM; 131 132 *offset = user->size; 133 user->size += padded_size; 134 135 return 0; 136 } 137 138 /* 139 * Allocate space for an optional record of <size> bytes in the user 140 * signal frame. The offset from the signal frame base address to the 141 * allocated block is assigned to *offset. 142 */ 143 static int sigframe_alloc(struct rt_sigframe_user_layout *user, 144 unsigned long *offset, size_t size) 145 { 146 return __sigframe_alloc(user, offset, size, true); 147 } 148 149 /* Allocate the null terminator record and prevent further allocations */ 150 static int sigframe_alloc_end(struct rt_sigframe_user_layout *user) 151 { 152 int ret; 153 154 /* Un-reserve the space reserved for the terminator: */ 155 user->limit += TERMINATOR_SIZE; 156 157 ret = sigframe_alloc(user, &user->end_offset, 158 sizeof(struct _aarch64_ctx)); 159 if (ret) 160 return ret; 161 162 /* Prevent further allocation: */ 163 user->limit = user->size; 164 return 0; 165 } 166 167 static void __user *apply_user_offset( 168 struct rt_sigframe_user_layout const *user, unsigned long offset) 169 { 170 char __user *base = (char __user *)user->sigframe; 171 172 return base + offset; 173 } 174 175 static int preserve_fpsimd_context(struct fpsimd_context __user *ctx) 176 { 177 struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state; 178 int err; 179 180 /* dump the hardware registers to the fpsimd_state structure */ 181 fpsimd_preserve_current_state(); 182 183 /* copy the FP and status/control registers */ 184 err = __copy_to_user(ctx->vregs, fpsimd->vregs, sizeof(fpsimd->vregs)); 185 __put_user_error(fpsimd->fpsr, &ctx->fpsr, err); 186 __put_user_error(fpsimd->fpcr, &ctx->fpcr, err); 187 188 /* copy the magic/size information */ 189 __put_user_error(FPSIMD_MAGIC, &ctx->head.magic, err); 190 __put_user_error(sizeof(struct fpsimd_context), &ctx->head.size, err); 191 192 return err ? -EFAULT : 0; 193 } 194 195 static int restore_fpsimd_context(struct fpsimd_context __user *ctx) 196 { 197 struct fpsimd_state fpsimd; 198 __u32 magic, size; 199 int err = 0; 200 201 /* check the magic/size information */ 202 __get_user_error(magic, &ctx->head.magic, err); 203 __get_user_error(size, &ctx->head.size, err); 204 if (err) 205 return -EFAULT; 206 if (magic != FPSIMD_MAGIC || size != sizeof(struct fpsimd_context)) 207 return -EINVAL; 208 209 /* copy the FP and status/control registers */ 210 err = __copy_from_user(fpsimd.vregs, ctx->vregs, 211 sizeof(fpsimd.vregs)); 212 __get_user_error(fpsimd.fpsr, &ctx->fpsr, err); 213 __get_user_error(fpsimd.fpcr, &ctx->fpcr, err); 214 215 /* load the hardware registers from the fpsimd_state structure */ 216 if (!err) 217 fpsimd_update_current_state(&fpsimd); 218 219 return err ? -EFAULT : 0; 220 } 221 222 struct user_ctxs { 223 struct fpsimd_context __user *fpsimd; 224 }; 225 226 static int parse_user_sigframe(struct user_ctxs *user, 227 struct rt_sigframe __user *sf) 228 { 229 struct sigcontext __user *const sc = &sf->uc.uc_mcontext; 230 struct _aarch64_ctx __user *head; 231 char __user *base = (char __user *)&sc->__reserved; 232 size_t offset = 0; 233 size_t limit = sizeof(sc->__reserved); 234 bool have_extra_context = false; 235 char const __user *const sfp = (char const __user *)sf; 236 237 user->fpsimd = NULL; 238 239 if (!IS_ALIGNED((unsigned long)base, 16)) 240 goto invalid; 241 242 while (1) { 243 int err = 0; 244 u32 magic, size; 245 char const __user *userp; 246 struct extra_context const __user *extra; 247 u64 extra_datap; 248 u32 extra_size; 249 struct _aarch64_ctx const __user *end; 250 u32 end_magic, end_size; 251 252 if (limit - offset < sizeof(*head)) 253 goto invalid; 254 255 if (!IS_ALIGNED(offset, 16)) 256 goto invalid; 257 258 head = (struct _aarch64_ctx __user *)(base + offset); 259 __get_user_error(magic, &head->magic, err); 260 __get_user_error(size, &head->size, err); 261 if (err) 262 return err; 263 264 if (limit - offset < size) 265 goto invalid; 266 267 switch (magic) { 268 case 0: 269 if (size) 270 goto invalid; 271 272 goto done; 273 274 case FPSIMD_MAGIC: 275 if (user->fpsimd) 276 goto invalid; 277 278 if (size < sizeof(*user->fpsimd)) 279 goto invalid; 280 281 user->fpsimd = (struct fpsimd_context __user *)head; 282 break; 283 284 case ESR_MAGIC: 285 /* ignore */ 286 break; 287 288 case EXTRA_MAGIC: 289 if (have_extra_context) 290 goto invalid; 291 292 if (size < sizeof(*extra)) 293 goto invalid; 294 295 userp = (char const __user *)head; 296 297 extra = (struct extra_context const __user *)userp; 298 userp += size; 299 300 __get_user_error(extra_datap, &extra->datap, err); 301 __get_user_error(extra_size, &extra->size, err); 302 if (err) 303 return err; 304 305 /* Check for the dummy terminator in __reserved[]: */ 306 307 if (limit - offset - size < TERMINATOR_SIZE) 308 goto invalid; 309 310 end = (struct _aarch64_ctx const __user *)userp; 311 userp += TERMINATOR_SIZE; 312 313 __get_user_error(end_magic, &end->magic, err); 314 __get_user_error(end_size, &end->size, err); 315 if (err) 316 return err; 317 318 if (end_magic || end_size) 319 goto invalid; 320 321 /* Prevent looping/repeated parsing of extra_context */ 322 have_extra_context = true; 323 324 base = (__force void __user *)extra_datap; 325 if (!IS_ALIGNED((unsigned long)base, 16)) 326 goto invalid; 327 328 if (!IS_ALIGNED(extra_size, 16)) 329 goto invalid; 330 331 if (base != userp) 332 goto invalid; 333 334 /* Reject "unreasonably large" frames: */ 335 if (extra_size > sfp + SIGFRAME_MAXSZ - userp) 336 goto invalid; 337 338 /* 339 * Ignore trailing terminator in __reserved[] 340 * and start parsing extra data: 341 */ 342 offset = 0; 343 limit = extra_size; 344 continue; 345 346 default: 347 goto invalid; 348 } 349 350 if (size < sizeof(*head)) 351 goto invalid; 352 353 if (limit - offset < size) 354 goto invalid; 355 356 offset += size; 357 } 358 359 done: 360 if (!user->fpsimd) 361 goto invalid; 362 363 return 0; 364 365 invalid: 366 return -EINVAL; 367 } 368 369 static int restore_sigframe(struct pt_regs *regs, 370 struct rt_sigframe __user *sf) 371 { 372 sigset_t set; 373 int i, err; 374 struct user_ctxs user; 375 376 err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set)); 377 if (err == 0) 378 set_current_blocked(&set); 379 380 for (i = 0; i < 31; i++) 381 __get_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i], 382 err); 383 __get_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err); 384 __get_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err); 385 __get_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err); 386 387 /* 388 * Avoid sys_rt_sigreturn() restarting. 389 */ 390 regs->syscallno = ~0UL; 391 392 err |= !valid_user_regs(®s->user_regs, current); 393 if (err == 0) 394 err = parse_user_sigframe(&user, sf); 395 396 if (err == 0) 397 err = restore_fpsimd_context(user.fpsimd); 398 399 return err; 400 } 401 402 asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) 403 { 404 struct rt_sigframe __user *frame; 405 406 /* Always make any pending restarted system calls return -EINTR */ 407 current->restart_block.fn = do_no_restart_syscall; 408 409 /* 410 * Since we stacked the signal on a 128-bit boundary, then 'sp' should 411 * be word aligned here. 412 */ 413 if (regs->sp & 15) 414 goto badframe; 415 416 frame = (struct rt_sigframe __user *)regs->sp; 417 418 if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) 419 goto badframe; 420 421 if (restore_sigframe(regs, frame)) 422 goto badframe; 423 424 if (restore_altstack(&frame->uc.uc_stack)) 425 goto badframe; 426 427 return regs->regs[0]; 428 429 badframe: 430 if (show_unhandled_signals) 431 pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", 432 current->comm, task_pid_nr(current), __func__, 433 regs->pc, regs->sp); 434 force_sig(SIGSEGV, current); 435 return 0; 436 } 437 438 /* Determine the layout of optional records in the signal frame */ 439 static int setup_sigframe_layout(struct rt_sigframe_user_layout *user) 440 { 441 int err; 442 443 err = sigframe_alloc(user, &user->fpsimd_offset, 444 sizeof(struct fpsimd_context)); 445 if (err) 446 return err; 447 448 /* fault information, if valid */ 449 if (current->thread.fault_code) { 450 err = sigframe_alloc(user, &user->esr_offset, 451 sizeof(struct esr_context)); 452 if (err) 453 return err; 454 } 455 456 return sigframe_alloc_end(user); 457 } 458 459 460 static int setup_sigframe(struct rt_sigframe_user_layout *user, 461 struct pt_regs *regs, sigset_t *set) 462 { 463 int i, err = 0; 464 struct rt_sigframe __user *sf = user->sigframe; 465 466 /* set up the stack frame for unwinding */ 467 __put_user_error(regs->regs[29], &user->next_frame->fp, err); 468 __put_user_error(regs->regs[30], &user->next_frame->lr, err); 469 470 for (i = 0; i < 31; i++) 471 __put_user_error(regs->regs[i], &sf->uc.uc_mcontext.regs[i], 472 err); 473 __put_user_error(regs->sp, &sf->uc.uc_mcontext.sp, err); 474 __put_user_error(regs->pc, &sf->uc.uc_mcontext.pc, err); 475 __put_user_error(regs->pstate, &sf->uc.uc_mcontext.pstate, err); 476 477 __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err); 478 479 err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set)); 480 481 if (err == 0) { 482 struct fpsimd_context __user *fpsimd_ctx = 483 apply_user_offset(user, user->fpsimd_offset); 484 err |= preserve_fpsimd_context(fpsimd_ctx); 485 } 486 487 /* fault information, if valid */ 488 if (err == 0 && user->esr_offset) { 489 struct esr_context __user *esr_ctx = 490 apply_user_offset(user, user->esr_offset); 491 492 __put_user_error(ESR_MAGIC, &esr_ctx->head.magic, err); 493 __put_user_error(sizeof(*esr_ctx), &esr_ctx->head.size, err); 494 __put_user_error(current->thread.fault_code, &esr_ctx->esr, err); 495 } 496 497 if (err == 0 && user->extra_offset) { 498 char __user *sfp = (char __user *)user->sigframe; 499 char __user *userp = 500 apply_user_offset(user, user->extra_offset); 501 502 struct extra_context __user *extra; 503 struct _aarch64_ctx __user *end; 504 u64 extra_datap; 505 u32 extra_size; 506 507 extra = (struct extra_context __user *)userp; 508 userp += EXTRA_CONTEXT_SIZE; 509 510 end = (struct _aarch64_ctx __user *)userp; 511 userp += TERMINATOR_SIZE; 512 513 /* 514 * extra_datap is just written to the signal frame. 515 * The value gets cast back to a void __user * 516 * during sigreturn. 517 */ 518 extra_datap = (__force u64)userp; 519 extra_size = sfp + round_up(user->size, 16) - userp; 520 521 __put_user_error(EXTRA_MAGIC, &extra->head.magic, err); 522 __put_user_error(EXTRA_CONTEXT_SIZE, &extra->head.size, err); 523 __put_user_error(extra_datap, &extra->datap, err); 524 __put_user_error(extra_size, &extra->size, err); 525 526 /* Add the terminator */ 527 __put_user_error(0, &end->magic, err); 528 __put_user_error(0, &end->size, err); 529 } 530 531 /* set the "end" magic */ 532 if (err == 0) { 533 struct _aarch64_ctx __user *end = 534 apply_user_offset(user, user->end_offset); 535 536 __put_user_error(0, &end->magic, err); 537 __put_user_error(0, &end->size, err); 538 } 539 540 return err; 541 } 542 543 static int get_sigframe(struct rt_sigframe_user_layout *user, 544 struct ksignal *ksig, struct pt_regs *regs) 545 { 546 unsigned long sp, sp_top; 547 int err; 548 549 init_user_layout(user); 550 err = setup_sigframe_layout(user); 551 if (err) 552 return err; 553 554 sp = sp_top = sigsp(regs->sp, ksig); 555 556 sp = round_down(sp - sizeof(struct frame_record), 16); 557 user->next_frame = (struct frame_record __user *)sp; 558 559 sp = round_down(sp, 16) - sigframe_size(user); 560 user->sigframe = (struct rt_sigframe __user *)sp; 561 562 /* 563 * Check that we can actually write to the signal frame. 564 */ 565 if (!access_ok(VERIFY_WRITE, user->sigframe, sp_top - sp)) 566 return -EFAULT; 567 568 return 0; 569 } 570 571 static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, 572 struct rt_sigframe_user_layout *user, int usig) 573 { 574 __sigrestore_t sigtramp; 575 576 regs->regs[0] = usig; 577 regs->sp = (unsigned long)user->sigframe; 578 regs->regs[29] = (unsigned long)&user->next_frame->fp; 579 regs->pc = (unsigned long)ka->sa.sa_handler; 580 581 if (ka->sa.sa_flags & SA_RESTORER) 582 sigtramp = ka->sa.sa_restorer; 583 else 584 sigtramp = VDSO_SYMBOL(current->mm->context.vdso, sigtramp); 585 586 regs->regs[30] = (unsigned long)sigtramp; 587 } 588 589 static int setup_rt_frame(int usig, struct ksignal *ksig, sigset_t *set, 590 struct pt_regs *regs) 591 { 592 struct rt_sigframe_user_layout user; 593 struct rt_sigframe __user *frame; 594 int err = 0; 595 596 if (get_sigframe(&user, ksig, regs)) 597 return 1; 598 599 frame = user.sigframe; 600 601 __put_user_error(0, &frame->uc.uc_flags, err); 602 __put_user_error(NULL, &frame->uc.uc_link, err); 603 604 err |= __save_altstack(&frame->uc.uc_stack, regs->sp); 605 err |= setup_sigframe(&user, regs, set); 606 if (err == 0) { 607 setup_return(regs, &ksig->ka, &user, usig); 608 if (ksig->ka.sa.sa_flags & SA_SIGINFO) { 609 err |= copy_siginfo_to_user(&frame->info, &ksig->info); 610 regs->regs[1] = (unsigned long)&frame->info; 611 regs->regs[2] = (unsigned long)&frame->uc; 612 } 613 } 614 615 return err; 616 } 617 618 static void setup_restart_syscall(struct pt_regs *regs) 619 { 620 if (is_compat_task()) 621 compat_setup_restart_syscall(regs); 622 else 623 regs->regs[8] = __NR_restart_syscall; 624 } 625 626 /* 627 * OK, we're invoking a handler 628 */ 629 static void handle_signal(struct ksignal *ksig, struct pt_regs *regs) 630 { 631 struct task_struct *tsk = current; 632 sigset_t *oldset = sigmask_to_save(); 633 int usig = ksig->sig; 634 int ret; 635 636 /* 637 * Set up the stack frame 638 */ 639 if (is_compat_task()) { 640 if (ksig->ka.sa.sa_flags & SA_SIGINFO) 641 ret = compat_setup_rt_frame(usig, ksig, oldset, regs); 642 else 643 ret = compat_setup_frame(usig, ksig, oldset, regs); 644 } else { 645 ret = setup_rt_frame(usig, ksig, oldset, regs); 646 } 647 648 /* 649 * Check that the resulting registers are actually sane. 650 */ 651 ret |= !valid_user_regs(®s->user_regs, current); 652 653 /* 654 * Fast forward the stepping logic so we step into the signal 655 * handler. 656 */ 657 if (!ret) 658 user_fastforward_single_step(tsk); 659 660 signal_setup_done(ret, ksig, 0); 661 } 662 663 /* 664 * Note that 'init' is a special process: it doesn't get signals it doesn't 665 * want to handle. Thus you cannot kill init even with a SIGKILL even by 666 * mistake. 667 * 668 * Note that we go through the signals twice: once to check the signals that 669 * the kernel can handle, and then we build all the user-level signal handling 670 * stack-frames in one go after that. 671 */ 672 static void do_signal(struct pt_regs *regs) 673 { 674 unsigned long continue_addr = 0, restart_addr = 0; 675 int retval = 0; 676 int syscall = (int)regs->syscallno; 677 struct ksignal ksig; 678 679 /* 680 * If we were from a system call, check for system call restarting... 681 */ 682 if (syscall >= 0) { 683 continue_addr = regs->pc; 684 restart_addr = continue_addr - (compat_thumb_mode(regs) ? 2 : 4); 685 retval = regs->regs[0]; 686 687 /* 688 * Avoid additional syscall restarting via ret_to_user. 689 */ 690 regs->syscallno = ~0UL; 691 692 /* 693 * Prepare for system call restart. We do this here so that a 694 * debugger will see the already changed PC. 695 */ 696 switch (retval) { 697 case -ERESTARTNOHAND: 698 case -ERESTARTSYS: 699 case -ERESTARTNOINTR: 700 case -ERESTART_RESTARTBLOCK: 701 regs->regs[0] = regs->orig_x0; 702 regs->pc = restart_addr; 703 break; 704 } 705 } 706 707 /* 708 * Get the signal to deliver. When running under ptrace, at this point 709 * the debugger may change all of our registers. 710 */ 711 if (get_signal(&ksig)) { 712 /* 713 * Depending on the signal settings, we may need to revert the 714 * decision to restart the system call, but skip this if a 715 * debugger has chosen to restart at a different PC. 716 */ 717 if (regs->pc == restart_addr && 718 (retval == -ERESTARTNOHAND || 719 retval == -ERESTART_RESTARTBLOCK || 720 (retval == -ERESTARTSYS && 721 !(ksig.ka.sa.sa_flags & SA_RESTART)))) { 722 regs->regs[0] = -EINTR; 723 regs->pc = continue_addr; 724 } 725 726 handle_signal(&ksig, regs); 727 return; 728 } 729 730 /* 731 * Handle restarting a different system call. As above, if a debugger 732 * has chosen to restart at a different PC, ignore the restart. 733 */ 734 if (syscall >= 0 && regs->pc == restart_addr) { 735 if (retval == -ERESTART_RESTARTBLOCK) 736 setup_restart_syscall(regs); 737 user_rewind_single_step(current); 738 } 739 740 restore_saved_sigmask(); 741 } 742 743 asmlinkage void do_notify_resume(struct pt_regs *regs, 744 unsigned int thread_flags) 745 { 746 /* 747 * The assembly code enters us with IRQs off, but it hasn't 748 * informed the tracing code of that for efficiency reasons. 749 * Update the trace code with the current status. 750 */ 751 trace_hardirqs_off(); 752 do { 753 if (thread_flags & _TIF_NEED_RESCHED) { 754 schedule(); 755 } else { 756 local_irq_enable(); 757 758 if (thread_flags & _TIF_UPROBE) 759 uprobe_notify_resume(regs); 760 761 if (thread_flags & _TIF_SIGPENDING) 762 do_signal(regs); 763 764 if (thread_flags & _TIF_NOTIFY_RESUME) { 765 clear_thread_flag(TIF_NOTIFY_RESUME); 766 tracehook_notify_resume(regs); 767 } 768 769 if (thread_flags & _TIF_FOREIGN_FPSTATE) 770 fpsimd_restore_current_state(); 771 } 772 773 local_irq_disable(); 774 thread_flags = READ_ONCE(current_thread_info()->flags); 775 } while (thread_flags & _TIF_WORK_MASK); 776 } 777