1/* ptrace.c */ 2/* By Ross Biro 1/23/92 */ 3/* 4 * Pentium III FXSR, SSE support 5 * Gareth Hughes <gareth@valinux.com>, May 2000 6 */ 7 8#include <linux/kernel.h> 9#include <linux/sched.h> 10#include <linux/mm.h> 11#include <linux/smp.h> 12#include <linux/errno.h> 13#include <linux/ptrace.h> 14#include <linux/user.h> 15#include <linux/security.h> 16#include <linux/audit.h> 17#include <linux/seccomp.h> 18#include <linux/signal.h> 19 20#include <asm/uaccess.h> 21#include <asm/pgtable.h> 22#include <asm/system.h> 23#include <asm/processor.h> 24#include <asm/i387.h> 25#include <asm/debugreg.h> 26#include <asm/ldt.h> 27#include <asm/desc.h> 28 29/* 30 * does not yet catch signals sent when the child dies. 31 * in exit.c or in signal.c. 32 */ 33 34/* 35 * Determines which flags the user has access to [1 = access, 0 = no access]. 36 * Prohibits changing ID(21), VIP(20), VIF(19), VM(17), NT(14), IOPL(12-13), IF(9). 37 * Also masks reserved bits (31-22, 15, 5, 3, 1). 38 */ 39#define FLAG_MASK 0x00050dd5 40 41/* set's the trap flag. */ 42#define TRAP_FLAG 0x100 43 44/* 45 * Offset of eflags on child stack.. 46 */ 47#define EFL_OFFSET offsetof(struct pt_regs, eflags) 48 49static inline struct pt_regs *get_child_regs(struct task_struct *task) 50{ 51 void *stack_top = (void *)task->thread.esp0; 52 return stack_top - sizeof(struct pt_regs); 53} 54 55/* 56 * This routine will get a word off of the processes privileged stack. 57 * the offset is bytes into the pt_regs structure on the stack. 58 * This routine assumes that all the privileged stacks are in our 59 * data space. 60 */ 61static inline int get_stack_long(struct task_struct *task, int offset) 62{ 63 unsigned char *stack; 64 65 stack = (unsigned char *)task->thread.esp0 - sizeof(struct pt_regs); 66 stack += offset; 67 return (*((int *)stack)); 68} 69 70/* 71 * This routine will put a word on the processes privileged stack. 72 * the offset is bytes into the pt_regs structure on the stack. 73 * This routine assumes that all the privileged stacks are in our 74 * data space. 75 */ 76static inline int put_stack_long(struct task_struct *task, int offset, 77 unsigned long data) 78{ 79 unsigned char * stack; 80 81 stack = (unsigned char *)task->thread.esp0 - sizeof(struct pt_regs); 82 stack += offset; 83 *(unsigned long *) stack = data; 84 return 0; 85} 86 87static int putreg(struct task_struct *child, 88 unsigned long regno, unsigned long value) 89{ 90 switch (regno >> 2) { 91 case GS: 92 if (value && (value & 3) != 3) 93 return -EIO; 94 child->thread.gs = value; 95 return 0; 96 case DS: 97 case ES: 98 case FS: 99 if (value && (value & 3) != 3) 100 return -EIO; 101 value &= 0xffff; 102 break; 103 case SS: 104 case CS: 105 if ((value & 3) != 3) 106 return -EIO; 107 value &= 0xffff; 108 break; 109 case EFL: 110 value &= FLAG_MASK; 111 value |= get_stack_long(child, EFL_OFFSET) & ~FLAG_MASK; 112 break; 113 } 114 if (regno > FS*4) 115 regno -= 1*4; 116 put_stack_long(child, regno, value); 117 return 0; 118} 119 120static unsigned long getreg(struct task_struct *child, 121 unsigned long regno) 122{ 123 unsigned long retval = ~0UL; 124 125 switch (regno >> 2) { 126 case GS: 127 retval = child->thread.gs; 128 break; 129 case DS: 130 case ES: 131 case FS: 132 case SS: 133 case CS: 134 retval = 0xffff; 135 /* fall through */ 136 default: 137 if (regno > FS*4) 138 regno -= 1*4; 139 retval &= get_stack_long(child, regno); 140 } 141 return retval; 142} 143 144#define LDT_SEGMENT 4 145 146static unsigned long convert_eip_to_linear(struct task_struct *child, struct pt_regs *regs) 147{ 148 unsigned long addr, seg; 149 150 addr = regs->eip; 151 seg = regs->xcs & 0xffff; 152 if (regs->eflags & VM_MASK) { 153 addr = (addr & 0xffff) + (seg << 4); 154 return addr; 155 } 156 157 /* 158 * We'll assume that the code segments in the GDT 159 * are all zero-based. That is largely true: the 160 * TLS segments are used for data, and the PNPBIOS 161 * and APM bios ones we just ignore here. 162 */ 163 if (seg & LDT_SEGMENT) { 164 u32 *desc; 165 unsigned long base; 166 167 down(&child->mm->context.sem); 168 desc = child->mm->context.ldt + (seg & ~7); 169 base = (desc[0] >> 16) | ((desc[1] & 0xff) << 16) | (desc[1] & 0xff000000); 170 171 /* 16-bit code segment? */ 172 if (!((desc[1] >> 22) & 1)) 173 addr &= 0xffff; 174 addr += base; 175 up(&child->mm->context.sem); 176 } 177 return addr; 178} 179 180static inline int is_setting_trap_flag(struct task_struct *child, struct pt_regs *regs) 181{ 182 int i, copied; 183 unsigned char opcode[15]; 184 unsigned long addr = convert_eip_to_linear(child, regs); 185 186 copied = access_process_vm(child, addr, opcode, sizeof(opcode), 0); 187 for (i = 0; i < copied; i++) { 188 switch (opcode[i]) { 189 /* popf and iret */ 190 case 0x9d: case 0xcf: 191 return 1; 192 /* opcode and address size prefixes */ 193 case 0x66: case 0x67: 194 continue; 195 /* irrelevant prefixes (segment overrides and repeats) */ 196 case 0x26: case 0x2e: 197 case 0x36: case 0x3e: 198 case 0x64: case 0x65: 199 case 0xf0: case 0xf2: case 0xf3: 200 continue; 201 202 /* 203 * pushf: NOTE! We should probably not let 204 * the user see the TF bit being set. But 205 * it's more pain than it's worth to avoid 206 * it, and a debugger could emulate this 207 * all in user space if it _really_ cares. 208 */ 209 case 0x9c: 210 default: 211 return 0; 212 } 213 } 214 return 0; 215} 216 217static void set_singlestep(struct task_struct *child) 218{ 219 struct pt_regs *regs = get_child_regs(child); 220 221 /* 222 * Always set TIF_SINGLESTEP - this guarantees that 223 * we single-step system calls etc.. This will also 224 * cause us to set TF when returning to user mode. 225 */ 226 set_tsk_thread_flag(child, TIF_SINGLESTEP); 227 228 /* 229 * If TF was already set, don't do anything else 230 */ 231 if (regs->eflags & TRAP_FLAG) 232 return; 233 234 /* Set TF on the kernel stack.. */ 235 regs->eflags |= TRAP_FLAG; 236 237 /* 238 * ..but if TF is changed by the instruction we will trace, 239 * don't mark it as being "us" that set it, so that we 240 * won't clear it by hand later. 241 */ 242 if (is_setting_trap_flag(child, regs)) 243 return; 244 245 child->ptrace |= PT_DTRACE; 246} 247 248static void clear_singlestep(struct task_struct *child) 249{ 250 /* Always clear TIF_SINGLESTEP... */ 251 clear_tsk_thread_flag(child, TIF_SINGLESTEP); 252 253 /* But touch TF only if it was set by us.. */ 254 if (child->ptrace & PT_DTRACE) { 255 struct pt_regs *regs = get_child_regs(child); 256 regs->eflags &= ~TRAP_FLAG; 257 child->ptrace &= ~PT_DTRACE; 258 } 259} 260 261/* 262 * Called by kernel/ptrace.c when detaching.. 263 * 264 * Make sure the single step bit is not set. 265 */ 266void ptrace_disable(struct task_struct *child) 267{ 268 clear_singlestep(child); 269 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 270 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 271} 272 273/* 274 * Perform get_thread_area on behalf of the traced child. 275 */ 276static int 277ptrace_get_thread_area(struct task_struct *child, 278 int idx, struct user_desc __user *user_desc) 279{ 280 struct user_desc info; 281 struct desc_struct *desc; 282 283/* 284 * Get the current Thread-Local Storage area: 285 */ 286 287#define GET_BASE(desc) ( \ 288 (((desc)->a >> 16) & 0x0000ffff) | \ 289 (((desc)->b << 16) & 0x00ff0000) | \ 290 ( (desc)->b & 0xff000000) ) 291 292#define GET_LIMIT(desc) ( \ 293 ((desc)->a & 0x0ffff) | \ 294 ((desc)->b & 0xf0000) ) 295 296#define GET_32BIT(desc) (((desc)->b >> 22) & 1) 297#define GET_CONTENTS(desc) (((desc)->b >> 10) & 3) 298#define GET_WRITABLE(desc) (((desc)->b >> 9) & 1) 299#define GET_LIMIT_PAGES(desc) (((desc)->b >> 23) & 1) 300#define GET_PRESENT(desc) (((desc)->b >> 15) & 1) 301#define GET_USEABLE(desc) (((desc)->b >> 20) & 1) 302 303 if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) 304 return -EINVAL; 305 306 desc = child->thread.tls_array + idx - GDT_ENTRY_TLS_MIN; 307 308 info.entry_number = idx; 309 info.base_addr = GET_BASE(desc); 310 info.limit = GET_LIMIT(desc); 311 info.seg_32bit = GET_32BIT(desc); 312 info.contents = GET_CONTENTS(desc); 313 info.read_exec_only = !GET_WRITABLE(desc); 314 info.limit_in_pages = GET_LIMIT_PAGES(desc); 315 info.seg_not_present = !GET_PRESENT(desc); 316 info.useable = GET_USEABLE(desc); 317 318 if (copy_to_user(user_desc, &info, sizeof(info))) 319 return -EFAULT; 320 321 return 0; 322} 323 324/* 325 * Perform set_thread_area on behalf of the traced child. 326 */ 327static int 328ptrace_set_thread_area(struct task_struct *child, 329 int idx, struct user_desc __user *user_desc) 330{ 331 struct user_desc info; 332 struct desc_struct *desc; 333 334 if (copy_from_user(&info, user_desc, sizeof(info))) 335 return -EFAULT; 336 337 if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) 338 return -EINVAL; 339 340 desc = child->thread.tls_array + idx - GDT_ENTRY_TLS_MIN; 341 if (LDT_empty(&info)) { 342 desc->a = 0; 343 desc->b = 0; 344 } else { 345 desc->a = LDT_entry_a(&info); 346 desc->b = LDT_entry_b(&info); 347 } 348 349 return 0; 350} 351 352long arch_ptrace(struct task_struct *child, long request, long addr, long data) 353{ 354 struct user * dummy = NULL; 355 int i, ret; 356 unsigned long __user *datap = (unsigned long __user *)data; 357 358 switch (request) { 359 /* when I and D space are separate, these will need to be fixed. */ 360 case PTRACE_PEEKTEXT: /* read word at location addr. */ 361 case PTRACE_PEEKDATA: { 362 unsigned long tmp; 363 int copied; 364 365 copied = access_process_vm(child, addr, &tmp, sizeof(tmp), 0); 366 ret = -EIO; 367 if (copied != sizeof(tmp)) 368 break; 369 ret = put_user(tmp, datap); 370 break; 371 } 372 373 /* read the word at location addr in the USER area. */ 374 case PTRACE_PEEKUSR: { 375 unsigned long tmp; 376 377 ret = -EIO; 378 if ((addr & 3) || addr < 0 || 379 addr > sizeof(struct user) - 3) 380 break; 381 382 tmp = 0; /* Default return condition */ 383 if(addr < FRAME_SIZE*sizeof(long)) 384 tmp = getreg(child, addr); 385 if(addr >= (long) &dummy->u_debugreg[0] && 386 addr <= (long) &dummy->u_debugreg[7]){ 387 addr -= (long) &dummy->u_debugreg[0]; 388 addr = addr >> 2; 389 tmp = child->thread.debugreg[addr]; 390 } 391 ret = put_user(tmp, datap); 392 break; 393 } 394 395 /* when I and D space are separate, this will have to be fixed. */ 396 case PTRACE_POKETEXT: /* write the word at location addr. */ 397 case PTRACE_POKEDATA: 398 ret = 0; 399 if (access_process_vm(child, addr, &data, sizeof(data), 1) == sizeof(data)) 400 break; 401 ret = -EIO; 402 break; 403 404 case PTRACE_POKEUSR: /* write the word at location addr in the USER area */ 405 ret = -EIO; 406 if ((addr & 3) || addr < 0 || 407 addr > sizeof(struct user) - 3) 408 break; 409 410 if (addr < FRAME_SIZE*sizeof(long)) { 411 ret = putreg(child, addr, data); 412 break; 413 } 414 /* We need to be very careful here. We implicitly 415 want to modify a portion of the task_struct, and we 416 have to be selective about what portions we allow someone 417 to modify. */ 418 419 ret = -EIO; 420 if(addr >= (long) &dummy->u_debugreg[0] && 421 addr <= (long) &dummy->u_debugreg[7]){ 422 423 if(addr == (long) &dummy->u_debugreg[4]) break; 424 if(addr == (long) &dummy->u_debugreg[5]) break; 425 if(addr < (long) &dummy->u_debugreg[4] && 426 ((unsigned long) data) >= TASK_SIZE-3) break; 427 428 /* Sanity-check data. Take one half-byte at once with 429 * check = (val >> (16 + 4*i)) & 0xf. It contains the 430 * R/Wi and LENi bits; bits 0 and 1 are R/Wi, and bits 431 * 2 and 3 are LENi. Given a list of invalid values, 432 * we do mask |= 1 << invalid_value, so that 433 * (mask >> check) & 1 is a correct test for invalid 434 * values. 435 * 436 * R/Wi contains the type of the breakpoint / 437 * watchpoint, LENi contains the length of the watched 438 * data in the watchpoint case. 439 * 440 * The invalid values are: 441 * - LENi == 0x10 (undefined), so mask |= 0x0f00. 442 * - R/Wi == 0x10 (break on I/O reads or writes), so 443 * mask |= 0x4444. 444 * - R/Wi == 0x00 && LENi != 0x00, so we have mask |= 445 * 0x1110. 446 * 447 * Finally, mask = 0x0f00 | 0x4444 | 0x1110 == 0x5f54. 448 * 449 * See the Intel Manual "System Programming Guide", 450 * 15.2.4 451 * 452 * Note that LENi == 0x10 is defined on x86_64 in long 453 * mode (i.e. even for 32-bit userspace software, but 454 * 64-bit kernel), so the x86_64 mask value is 0x5454. 455 * See the AMD manual no. 24593 (AMD64 System 456 * Programming)*/ 457 458 if(addr == (long) &dummy->u_debugreg[7]) { 459 data &= ~DR_CONTROL_RESERVED; 460 for(i=0; i<4; i++) 461 if ((0x5f54 >> ((data >> (16 + 4*i)) & 0xf)) & 1) 462 goto out_tsk; 463 if (data) 464 set_tsk_thread_flag(child, TIF_DEBUG); 465 else 466 clear_tsk_thread_flag(child, TIF_DEBUG); 467 } 468 addr -= (long) &dummy->u_debugreg; 469 addr = addr >> 2; 470 child->thread.debugreg[addr] = data; 471 ret = 0; 472 } 473 break; 474 475 case PTRACE_SYSEMU: /* continue and stop at next syscall, which will not be executed */ 476 case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */ 477 case PTRACE_CONT: /* restart after signal. */ 478 ret = -EIO; 479 if (!valid_signal(data)) 480 break; 481 if (request == PTRACE_SYSEMU) { 482 set_tsk_thread_flag(child, TIF_SYSCALL_EMU); 483 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 484 } else if (request == PTRACE_SYSCALL) { 485 set_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 486 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 487 } else { 488 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 489 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 490 } 491 child->exit_code = data; 492 /* make sure the single step bit is not set. */ 493 clear_singlestep(child); 494 wake_up_process(child); 495 ret = 0; 496 break; 497 498/* 499 * make the child exit. Best I can do is send it a sigkill. 500 * perhaps it should be put in the status that it wants to 501 * exit. 502 */ 503 case PTRACE_KILL: 504 ret = 0; 505 if (child->exit_state == EXIT_ZOMBIE) /* already dead */ 506 break; 507 child->exit_code = SIGKILL; 508 /* make sure the single step bit is not set. */ 509 clear_singlestep(child); 510 wake_up_process(child); 511 break; 512 513 case PTRACE_SYSEMU_SINGLESTEP: /* Same as SYSEMU, but singlestep if not syscall */ 514 case PTRACE_SINGLESTEP: /* set the trap flag. */ 515 ret = -EIO; 516 if (!valid_signal(data)) 517 break; 518 519 if (request == PTRACE_SYSEMU_SINGLESTEP) 520 set_tsk_thread_flag(child, TIF_SYSCALL_EMU); 521 else 522 clear_tsk_thread_flag(child, TIF_SYSCALL_EMU); 523 524 clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE); 525 set_singlestep(child); 526 child->exit_code = data; 527 /* give it a chance to run. */ 528 wake_up_process(child); 529 ret = 0; 530 break; 531 532 case PTRACE_DETACH: 533 /* detach a process that was attached. */ 534 ret = ptrace_detach(child, data); 535 break; 536 537 case PTRACE_GETREGS: { /* Get all gp regs from the child. */ 538 if (!access_ok(VERIFY_WRITE, datap, FRAME_SIZE*sizeof(long))) { 539 ret = -EIO; 540 break; 541 } 542 for ( i = 0; i < FRAME_SIZE*sizeof(long); i += sizeof(long) ) { 543 __put_user(getreg(child, i), datap); 544 datap++; 545 } 546 ret = 0; 547 break; 548 } 549 550 case PTRACE_SETREGS: { /* Set all gp regs in the child. */ 551 unsigned long tmp; 552 if (!access_ok(VERIFY_READ, datap, FRAME_SIZE*sizeof(long))) { 553 ret = -EIO; 554 break; 555 } 556 for ( i = 0; i < FRAME_SIZE*sizeof(long); i += sizeof(long) ) { 557 __get_user(tmp, datap); 558 putreg(child, i, tmp); 559 datap++; 560 } 561 ret = 0; 562 break; 563 } 564 565 case PTRACE_GETFPREGS: { /* Get the child FPU state. */ 566 if (!access_ok(VERIFY_WRITE, datap, 567 sizeof(struct user_i387_struct))) { 568 ret = -EIO; 569 break; 570 } 571 ret = 0; 572 if (!tsk_used_math(child)) 573 init_fpu(child); 574 get_fpregs((struct user_i387_struct __user *)data, child); 575 break; 576 } 577 578 case PTRACE_SETFPREGS: { /* Set the child FPU state. */ 579 if (!access_ok(VERIFY_READ, datap, 580 sizeof(struct user_i387_struct))) { 581 ret = -EIO; 582 break; 583 } 584 set_stopped_child_used_math(child); 585 set_fpregs(child, (struct user_i387_struct __user *)data); 586 ret = 0; 587 break; 588 } 589 590 case PTRACE_GETFPXREGS: { /* Get the child extended FPU state. */ 591 if (!access_ok(VERIFY_WRITE, datap, 592 sizeof(struct user_fxsr_struct))) { 593 ret = -EIO; 594 break; 595 } 596 if (!tsk_used_math(child)) 597 init_fpu(child); 598 ret = get_fpxregs((struct user_fxsr_struct __user *)data, child); 599 break; 600 } 601 602 case PTRACE_SETFPXREGS: { /* Set the child extended FPU state. */ 603 if (!access_ok(VERIFY_READ, datap, 604 sizeof(struct user_fxsr_struct))) { 605 ret = -EIO; 606 break; 607 } 608 set_stopped_child_used_math(child); 609 ret = set_fpxregs(child, (struct user_fxsr_struct __user *)data); 610 break; 611 } 612 613 case PTRACE_GET_THREAD_AREA: 614 ret = ptrace_get_thread_area(child, addr, 615 (struct user_desc __user *) data); 616 break; 617 618 case PTRACE_SET_THREAD_AREA: 619 ret = ptrace_set_thread_area(child, addr, 620 (struct user_desc __user *) data); 621 break; 622 623 default: 624 ret = ptrace_request(child, request, addr, data); 625 break; 626 } 627 out_tsk: 628 return ret; 629} 630 631void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code) 632{ 633 struct siginfo info; 634 635 tsk->thread.trap_no = 1; 636 tsk->thread.error_code = error_code; 637 638 memset(&info, 0, sizeof(info)); 639 info.si_signo = SIGTRAP; 640 info.si_code = TRAP_BRKPT; 641 642 /* User-mode eip? */ 643 info.si_addr = user_mode_vm(regs) ? (void __user *) regs->eip : NULL; 644 645 /* Send us the fakey SIGTRAP */ 646 force_sig_info(SIGTRAP, &info, tsk); 647} 648 649/* notification of system call entry/exit 650 * - triggered by current->work.syscall_trace 651 */ 652__attribute__((regparm(3))) 653int do_syscall_trace(struct pt_regs *regs, int entryexit) 654{ 655 int is_sysemu = test_thread_flag(TIF_SYSCALL_EMU); 656 /* 657 * With TIF_SYSCALL_EMU set we want to ignore TIF_SINGLESTEP for syscall 658 * interception 659 */ 660 int is_singlestep = !is_sysemu && test_thread_flag(TIF_SINGLESTEP); 661 int ret = 0; 662 663 /* do the secure computing check first */ 664 if (!entryexit) 665 secure_computing(regs->orig_eax); 666 667 if (unlikely(current->audit_context)) { 668 if (entryexit) 669 audit_syscall_exit(AUDITSC_RESULT(regs->eax), 670 regs->eax); 671 /* Debug traps, when using PTRACE_SINGLESTEP, must be sent only 672 * on the syscall exit path. Normally, when TIF_SYSCALL_AUDIT is 673 * not used, entry.S will call us only on syscall exit, not 674 * entry; so when TIF_SYSCALL_AUDIT is used we must avoid 675 * calling send_sigtrap() on syscall entry. 676 * 677 * Note that when PTRACE_SYSEMU_SINGLESTEP is used, 678 * is_singlestep is false, despite his name, so we will still do 679 * the correct thing. 680 */ 681 else if (is_singlestep) 682 goto out; 683 } 684 685 if (!(current->ptrace & PT_PTRACED)) 686 goto out; 687 688 /* If a process stops on the 1st tracepoint with SYSCALL_TRACE 689 * and then is resumed with SYSEMU_SINGLESTEP, it will come in 690 * here. We have to check this and return */ 691 if (is_sysemu && entryexit) 692 return 0; 693 694 /* Fake a debug trap */ 695 if (is_singlestep) 696 send_sigtrap(current, regs, 0); 697 698 if (!test_thread_flag(TIF_SYSCALL_TRACE) && !is_sysemu) 699 goto out; 700 701 /* the 0x80 provides a way for the tracing parent to distinguish 702 between a syscall stop and SIGTRAP delivery */ 703 /* Note that the debugger could change the result of test_thread_flag!*/ 704 ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ? 0x80:0)); 705 706 /* 707 * this isn't the same as continuing with a signal, but it will do 708 * for normal use. strace only continues with a signal if the 709 * stopping signal is not SIGTRAP. -brl 710 */ 711 if (current->exit_code) { 712 send_sig(current->exit_code, current, 1); 713 current->exit_code = 0; 714 } 715 ret = is_sysemu; 716out: 717 if (unlikely(current->audit_context) && !entryexit) 718 audit_syscall_entry(AUDIT_ARCH_I386, regs->orig_eax, 719 regs->ebx, regs->ecx, regs->edx, regs->esi); 720 if (ret == 0) 721 return 0; 722 723 regs->orig_eax = -1; /* force skip of syscall restarting */ 724 if (unlikely(current->audit_context)) 725 audit_syscall_exit(AUDITSC_RESULT(regs->eax), regs->eax); 726 return 1; 727} 728