1 /*- 2 * Copyright (c) 2013 Dmitry Chagin 3 * Copyright (c) 2004 Tim J. Robbins 4 * Copyright (c) 2003 Peter Wemm 5 * Copyright (c) 2002 Doug Rabson 6 * Copyright (c) 1998-1999 Andrew Gallatin 7 * Copyright (c) 1994-1996 Søren Schmidt 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer 15 * in this position and unchanged. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #define __ELF_WORD_SIZE 64 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/exec.h> 42 #include <sys/fcntl.h> 43 #include <sys/imgact.h> 44 #include <sys/imgact_elf.h> 45 #include <sys/kernel.h> 46 #include <sys/ktr.h> 47 #include <sys/lock.h> 48 #include <sys/malloc.h> 49 #include <sys/module.h> 50 #include <sys/mutex.h> 51 #include <sys/proc.h> 52 #include <sys/resourcevar.h> 53 #include <sys/signalvar.h> 54 #include <sys/syscallsubr.h> 55 #include <sys/sysctl.h> 56 #include <sys/sysent.h> 57 #include <sys/sysproto.h> 58 #include <sys/vnode.h> 59 #include <sys/eventhandler.h> 60 61 #include <vm/vm.h> 62 #include <vm/pmap.h> 63 #include <vm/vm_extern.h> 64 #include <vm/vm_map.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_page.h> 67 #include <vm/vm_param.h> 68 69 #include <machine/cpu.h> 70 #include <machine/md_var.h> 71 #include <machine/pcb.h> 72 #include <machine/specialreg.h> 73 #include <machine/trap.h> 74 75 #include <amd64/linux/linux.h> 76 #include <amd64/linux/linux_proto.h> 77 #include <compat/linux/linux_emul.h> 78 #include <compat/linux/linux_ioctl.h> 79 #include <compat/linux/linux_mib.h> 80 #include <compat/linux/linux_misc.h> 81 #include <compat/linux/linux_signal.h> 82 #include <compat/linux/linux_sysproto.h> 83 #include <compat/linux/linux_util.h> 84 #include <compat/linux/linux_vdso.h> 85 86 MODULE_VERSION(linux64, 1); 87 88 const char *linux_kplatform; 89 static int linux_szsigcode; 90 static vm_object_t linux_shared_page_obj; 91 static char *linux_shared_page_mapping; 92 extern char _binary_linux_locore_o_start; 93 extern char _binary_linux_locore_o_end; 94 95 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 96 97 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 98 99 static int linux_copyout_strings(struct image_params *imgp, 100 uintptr_t *stack_base); 101 static int linux_fixup_elf(uintptr_t *stack_base, 102 struct image_params *iparams); 103 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 104 static void linux_vdso_install(void *param); 105 static void linux_vdso_deinstall(void *param); 106 static void linux_set_syscall_retval(struct thread *td, int error); 107 static int linux_fetch_syscall_args(struct thread *td); 108 static void linux_exec_setregs(struct thread *td, struct image_params *imgp, 109 uintptr_t stack); 110 static int linux_vsyscall(struct thread *td); 111 112 #define LINUX_T_UNKNOWN 255 113 static int _bsd_to_linux_trapcode[] = { 114 LINUX_T_UNKNOWN, /* 0 */ 115 6, /* 1 T_PRIVINFLT */ 116 LINUX_T_UNKNOWN, /* 2 */ 117 3, /* 3 T_BPTFLT */ 118 LINUX_T_UNKNOWN, /* 4 */ 119 LINUX_T_UNKNOWN, /* 5 */ 120 16, /* 6 T_ARITHTRAP */ 121 254, /* 7 T_ASTFLT */ 122 LINUX_T_UNKNOWN, /* 8 */ 123 13, /* 9 T_PROTFLT */ 124 1, /* 10 T_TRCTRAP */ 125 LINUX_T_UNKNOWN, /* 11 */ 126 14, /* 12 T_PAGEFLT */ 127 LINUX_T_UNKNOWN, /* 13 */ 128 17, /* 14 T_ALIGNFLT */ 129 LINUX_T_UNKNOWN, /* 15 */ 130 LINUX_T_UNKNOWN, /* 16 */ 131 LINUX_T_UNKNOWN, /* 17 */ 132 0, /* 18 T_DIVIDE */ 133 2, /* 19 T_NMI */ 134 4, /* 20 T_OFLOW */ 135 5, /* 21 T_BOUND */ 136 7, /* 22 T_DNA */ 137 8, /* 23 T_DOUBLEFLT */ 138 9, /* 24 T_FPOPFLT */ 139 10, /* 25 T_TSSFLT */ 140 11, /* 26 T_SEGNPFLT */ 141 12, /* 27 T_STKFLT */ 142 18, /* 28 T_MCHK */ 143 19, /* 29 T_XMMFLT */ 144 15 /* 30 T_RESERVED */ 145 }; 146 #define bsd_to_linux_trapcode(code) \ 147 ((code)<nitems(_bsd_to_linux_trapcode)? \ 148 _bsd_to_linux_trapcode[(code)]: \ 149 LINUX_T_UNKNOWN) 150 151 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 152 LINUX_VDSO_SYM_CHAR(linux_platform); 153 154 /* 155 * If FreeBSD & Linux have a difference of opinion about what a trap 156 * means, deal with it here. 157 * 158 * MPSAFE 159 */ 160 static int 161 linux_translate_traps(int signal, int trap_code) 162 { 163 164 if (signal != SIGBUS) 165 return (signal); 166 switch (trap_code) { 167 case T_PROTFLT: 168 case T_TSSFLT: 169 case T_DOUBLEFLT: 170 case T_PAGEFLT: 171 return (SIGSEGV); 172 default: 173 return (signal); 174 } 175 } 176 177 static int 178 linux_fetch_syscall_args(struct thread *td) 179 { 180 struct proc *p; 181 struct trapframe *frame; 182 struct syscall_args *sa; 183 184 p = td->td_proc; 185 frame = td->td_frame; 186 sa = &td->td_sa; 187 188 sa->args[0] = frame->tf_rdi; 189 sa->args[1] = frame->tf_rsi; 190 sa->args[2] = frame->tf_rdx; 191 sa->args[3] = frame->tf_rcx; 192 sa->args[4] = frame->tf_r8; 193 sa->args[5] = frame->tf_r9; 194 sa->code = frame->tf_rax; 195 196 if (sa->code >= p->p_sysent->sv_size) 197 /* nosys */ 198 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 199 else 200 sa->callp = &p->p_sysent->sv_table[sa->code]; 201 202 td->td_retval[0] = 0; 203 return (0); 204 } 205 206 static void 207 linux_set_syscall_retval(struct thread *td, int error) 208 { 209 struct trapframe *frame; 210 211 frame = td->td_frame; 212 213 switch (error) { 214 case 0: 215 frame->tf_rax = td->td_retval[0]; 216 frame->tf_r10 = frame->tf_rcx; 217 break; 218 219 case ERESTART: 220 /* 221 * Reconstruct pc, we know that 'syscall' is 2 bytes, 222 * lcall $X,y is 7 bytes, int 0x80 is 2 bytes. 223 * We saved this in tf_err. 224 * 225 */ 226 frame->tf_rip -= frame->tf_err; 227 frame->tf_r10 = frame->tf_rcx; 228 break; 229 230 case EJUSTRETURN: 231 break; 232 233 default: 234 frame->tf_rax = bsd_to_linux_errno(error); 235 frame->tf_r10 = frame->tf_rcx; 236 break; 237 } 238 239 /* 240 * Differently from FreeBSD native ABI, on Linux only %rcx 241 * and %r11 values are not preserved across the syscall. 242 * Require full context restore to get all registers except 243 * those two restored at return to usermode. 244 * 245 * XXX: Would be great to be able to avoid PCB_FULL_IRET 246 * for the error == 0 case. 247 */ 248 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 249 } 250 251 static int 252 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 253 { 254 Elf_Auxargs *args; 255 Elf_Auxinfo *argarray, *pos; 256 struct proc *p; 257 int error, issetugid; 258 259 p = imgp->proc; 260 args = (Elf64_Auxargs *)imgp->auxargs; 261 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 262 M_WAITOK | M_ZERO); 263 264 issetugid = p->p_flag & P_SUGID ? 1 : 0; 265 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 266 imgp->proc->p_sysent->sv_shared_page_base); 267 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 268 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 269 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 270 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 271 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 272 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 273 AUXARGS_ENTRY(pos, AT_BASE, args->base); 274 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 275 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 276 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 277 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 278 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 279 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 280 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 281 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); 282 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 283 if (imgp->execpathp != 0) 284 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); 285 if (args->execfd != -1) 286 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 287 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 288 AUXARGS_ENTRY(pos, AT_NULL, 0); 289 290 free(imgp->auxargs, M_TEMP); 291 imgp->auxargs = NULL; 292 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 293 294 error = copyout(argarray, (void *)base, 295 sizeof(*argarray) * LINUX_AT_COUNT); 296 free(argarray, M_TEMP); 297 return (error); 298 } 299 300 static int 301 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 302 { 303 Elf_Addr *base; 304 305 base = (Elf64_Addr *)*stack_base; 306 base--; 307 if (suword(base, (uint64_t)imgp->args->argc) == -1) 308 return (EFAULT); 309 310 *stack_base = (uintptr_t)base; 311 return (0); 312 } 313 314 /* 315 * Copy strings out to the new process address space, constructing new arg 316 * and env vector tables. Return a pointer to the base so that it can be used 317 * as the initial stack pointer. 318 */ 319 static int 320 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 321 { 322 int argc, envc, error; 323 char **vectp; 324 char *stringp; 325 uintptr_t destp, ustringp; 326 struct ps_strings *arginfo; 327 char canary[LINUX_AT_RANDOM_LEN]; 328 size_t execpath_len; 329 struct proc *p; 330 331 /* Calculate string base and vector table pointers. */ 332 if (imgp->execpath != NULL && imgp->auxargs != NULL) 333 execpath_len = strlen(imgp->execpath) + 1; 334 else 335 execpath_len = 0; 336 337 p = imgp->proc; 338 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 339 destp = (uintptr_t)arginfo; 340 341 if (execpath_len != 0) { 342 destp -= execpath_len; 343 destp = rounddown2(destp, sizeof(void *)); 344 imgp->execpathp = (void *)destp; 345 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 346 if (error != 0) 347 return (error); 348 } 349 350 /* Prepare the canary for SSP. */ 351 arc4rand(canary, sizeof(canary), 0); 352 destp -= roundup(sizeof(canary), sizeof(void *)); 353 imgp->canary = (void *)destp; 354 error = copyout(canary, imgp->canary, sizeof(canary)); 355 if (error != 0) 356 return (error); 357 358 /* Allocate room for the argument and environment strings. */ 359 destp -= ARG_MAX - imgp->args->stringspace; 360 destp = rounddown2(destp, sizeof(void *)); 361 ustringp = destp; 362 363 if (imgp->auxargs) { 364 /* 365 * Allocate room on the stack for the ELF auxargs 366 * array. It has LINUX_AT_COUNT entries. 367 */ 368 destp -= LINUX_AT_COUNT * sizeof(Elf64_Auxinfo); 369 destp = rounddown2(destp, sizeof(void *)); 370 } 371 372 vectp = (char **)destp; 373 374 /* 375 * Allocate room for the argv[] and env vectors including the 376 * terminating NULL pointers. 377 */ 378 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 379 380 /* 381 * Starting with 2.24, glibc depends on a 16-byte stack alignment. 382 * One "long argc" will be prepended later. 383 */ 384 vectp = (char **)((((uintptr_t)vectp + 8) & ~0xF) - 8); 385 386 /* vectp also becomes our initial stack base. */ 387 *stack_base = (uintptr_t)vectp; 388 389 stringp = imgp->args->begin_argv; 390 argc = imgp->args->argc; 391 envc = imgp->args->envc; 392 393 /* Copy out strings - arguments and environment. */ 394 error = copyout(stringp, (void *)ustringp, 395 ARG_MAX - imgp->args->stringspace); 396 if (error != 0) 397 return (error); 398 399 /* Fill in "ps_strings" struct for ps, w, etc. */ 400 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || 401 suword(&arginfo->ps_nargvstr, argc) != 0) 402 return (EFAULT); 403 404 /* Fill in argument portion of vector table. */ 405 for (; argc > 0; --argc) { 406 if (suword(vectp++, ustringp) != 0) 407 return (EFAULT); 408 while (*stringp++ != 0) 409 ustringp++; 410 ustringp++; 411 } 412 413 /* A null vector table pointer separates the argp's from the envp's. */ 414 if (suword(vectp++, 0) != 0) 415 return (EFAULT); 416 417 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || 418 suword(&arginfo->ps_nenvstr, envc) != 0) 419 return (EFAULT); 420 421 /* Fill in environment portion of vector table. */ 422 for (; envc > 0; --envc) { 423 if (suword(vectp++, ustringp) != 0) 424 return (EFAULT); 425 while (*stringp++ != 0) 426 ustringp++; 427 ustringp++; 428 } 429 430 /* The end of the vector table is a null pointer. */ 431 if (suword(vectp, 0) != 0) 432 return (EFAULT); 433 434 if (imgp->auxargs) { 435 vectp++; 436 error = imgp->sysent->sv_copyout_auxargs(imgp, 437 (uintptr_t)vectp); 438 if (error != 0) 439 return (error); 440 } 441 442 return (0); 443 } 444 445 /* 446 * Reset registers to default values on exec. 447 */ 448 static void 449 linux_exec_setregs(struct thread *td, struct image_params *imgp, 450 uintptr_t stack) 451 { 452 struct trapframe *regs; 453 struct pcb *pcb; 454 register_t saved_rflags; 455 456 regs = td->td_frame; 457 pcb = td->td_pcb; 458 459 if (td->td_proc->p_md.md_ldt != NULL) 460 user_ldt_free(td); 461 462 pcb->pcb_fsbase = 0; 463 pcb->pcb_gsbase = 0; 464 clear_pcb_flags(pcb, PCB_32BIT); 465 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 466 set_pcb_flags(pcb, PCB_FULL_IRET); 467 468 saved_rflags = regs->tf_rflags & PSL_T; 469 bzero((char *)regs, sizeof(struct trapframe)); 470 regs->tf_rip = imgp->entry_addr; 471 regs->tf_rsp = stack; 472 regs->tf_rflags = PSL_USER | saved_rflags; 473 regs->tf_ss = _udatasel; 474 regs->tf_cs = _ucodesel; 475 regs->tf_ds = _udatasel; 476 regs->tf_es = _udatasel; 477 regs->tf_fs = _ufssel; 478 regs->tf_gs = _ugssel; 479 regs->tf_flags = TF_HASSEGS; 480 481 x86_clear_dbregs(pcb); 482 483 /* 484 * Drop the FP state if we hold it, so that the process gets a 485 * clean FP state if it uses the FPU again. 486 */ 487 fpstate_drop(td); 488 } 489 490 /* 491 * Copied from amd64/amd64/machdep.c 492 * 493 * XXX fpu state need? don't think so 494 */ 495 int 496 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 497 { 498 struct proc *p; 499 struct l_ucontext uc; 500 struct l_sigcontext *context; 501 struct trapframe *regs; 502 unsigned long rflags; 503 int error; 504 ksiginfo_t ksi; 505 506 regs = td->td_frame; 507 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc)); 508 if (error != 0) 509 return (error); 510 511 p = td->td_proc; 512 context = &uc.uc_mcontext; 513 rflags = context->sc_rflags; 514 515 /* 516 * Don't allow users to change privileged or reserved flags. 517 */ 518 /* 519 * XXX do allow users to change the privileged flag PSL_RF. 520 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers 521 * should sometimes set it there too. tf_rflags is kept in 522 * the signal context during signal handling and there is no 523 * other place to remember it, so the PSL_RF bit may be 524 * corrupted by the signal handler without us knowing. 525 * Corruption of the PSL_RF bit at worst causes one more or 526 * one less debugger trap, so allowing it is fairly harmless. 527 */ 528 529 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 530 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 531 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags); 532 return (EINVAL); 533 } 534 535 /* 536 * Don't allow users to load a valid privileged %cs. Let the 537 * hardware check for invalid selectors, excess privilege in 538 * other selectors, invalid %eip's and invalid %esp's. 539 */ 540 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 541 if (!CS_SECURE(context->sc_cs)) { 542 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs); 543 ksiginfo_init_trap(&ksi); 544 ksi.ksi_signo = SIGBUS; 545 ksi.ksi_code = BUS_OBJERR; 546 ksi.ksi_trapno = T_PROTFLT; 547 ksi.ksi_addr = (void *)regs->tf_rip; 548 trapsignal(td, &ksi); 549 return (EINVAL); 550 } 551 552 PROC_LOCK(p); 553 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask); 554 SIG_CANTMASK(td->td_sigmask); 555 signotify(td); 556 PROC_UNLOCK(p); 557 558 regs->tf_rdi = context->sc_rdi; 559 regs->tf_rsi = context->sc_rsi; 560 regs->tf_rdx = context->sc_rdx; 561 regs->tf_rbp = context->sc_rbp; 562 regs->tf_rbx = context->sc_rbx; 563 regs->tf_rcx = context->sc_rcx; 564 regs->tf_rax = context->sc_rax; 565 regs->tf_rip = context->sc_rip; 566 regs->tf_rsp = context->sc_rsp; 567 regs->tf_r8 = context->sc_r8; 568 regs->tf_r9 = context->sc_r9; 569 regs->tf_r10 = context->sc_r10; 570 regs->tf_r11 = context->sc_r11; 571 regs->tf_r12 = context->sc_r12; 572 regs->tf_r13 = context->sc_r13; 573 regs->tf_r14 = context->sc_r14; 574 regs->tf_r15 = context->sc_r15; 575 regs->tf_cs = context->sc_cs; 576 regs->tf_err = context->sc_err; 577 regs->tf_rflags = rflags; 578 579 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 580 return (EJUSTRETURN); 581 } 582 583 /* 584 * copied from amd64/amd64/machdep.c 585 * 586 * Send an interrupt to process. 587 */ 588 static void 589 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 590 { 591 struct l_rt_sigframe sf, *sfp; 592 struct proc *p; 593 struct thread *td; 594 struct sigacts *psp; 595 caddr_t sp; 596 struct trapframe *regs; 597 int sig, code; 598 int oonstack; 599 600 td = curthread; 601 p = td->td_proc; 602 PROC_LOCK_ASSERT(p, MA_OWNED); 603 sig = ksi->ksi_signo; 604 psp = p->p_sigacts; 605 code = ksi->ksi_code; 606 mtx_assert(&psp->ps_mtx, MA_OWNED); 607 regs = td->td_frame; 608 oonstack = sigonstack(regs->tf_rsp); 609 610 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u", 611 catcher, sig, mask, code); 612 613 /* Allocate space for the signal handler context. */ 614 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 615 SIGISMEMBER(psp->ps_sigonstack, sig)) { 616 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - 617 sizeof(struct l_rt_sigframe); 618 } else 619 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128; 620 /* Align to 16 bytes. */ 621 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul); 622 mtx_unlock(&psp->ps_mtx); 623 624 /* Translate the signal. */ 625 sig = bsd_to_linux_signal(sig); 626 627 /* Save user context. */ 628 bzero(&sf, sizeof(sf)); 629 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask); 630 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask); 631 632 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 633 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 634 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 635 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 636 PROC_UNLOCK(p); 637 638 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi; 639 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi; 640 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx; 641 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp; 642 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx; 643 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx; 644 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax; 645 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip; 646 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp; 647 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8; 648 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9; 649 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10; 650 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11; 651 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12; 652 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13; 653 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14; 654 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15; 655 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 656 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags; 657 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err; 658 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 659 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 660 661 /* Build the argument list for the signal handler. */ 662 regs->tf_rdi = sig; /* arg 1 in %rdi */ 663 regs->tf_rax = 0; 664 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ 665 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */ 666 667 sf.sf_handler = catcher; 668 /* Fill in POSIX parts. */ 669 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig); 670 671 /* Copy the sigframe out to the user's stack. */ 672 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 673 PROC_LOCK(p); 674 sigexit(td, SIGILL); 675 } 676 677 regs->tf_rsp = (long)sfp; 678 regs->tf_rip = linux_rt_sigcode; 679 regs->tf_rflags &= ~(PSL_T | PSL_D); 680 regs->tf_cs = _ucodesel; 681 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 682 PROC_LOCK(p); 683 mtx_lock(&psp->ps_mtx); 684 } 685 686 #define LINUX_VSYSCALL_START (-10UL << 20) 687 #define LINUX_VSYSCALL_SZ 1024 688 689 const unsigned long linux_vsyscall_vector[] = { 690 LINUX_SYS_gettimeofday, 691 LINUX_SYS_linux_time, 692 LINUX_SYS_linux_getcpu, 693 }; 694 695 static int 696 linux_vsyscall(struct thread *td) 697 { 698 struct trapframe *frame; 699 uint64_t retqaddr; 700 int code, traced; 701 int error; 702 703 frame = td->td_frame; 704 705 /* Check %rip for vsyscall area. */ 706 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START)) 707 return (EINVAL); 708 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0) 709 return (EINVAL); 710 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ; 711 if (code >= nitems(linux_vsyscall_vector)) 712 return (EINVAL); 713 714 /* 715 * vsyscall called as callq *(%rax), so we must 716 * use return address from %rsp and also fixup %rsp. 717 */ 718 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr)); 719 if (error) 720 return (error); 721 722 frame->tf_rip = retqaddr; 723 frame->tf_rax = linux_vsyscall_vector[code]; 724 frame->tf_rsp += 8; 725 726 traced = (frame->tf_flags & PSL_T); 727 728 amd64_syscall(td, traced); 729 730 return (0); 731 } 732 733 struct sysentvec elf_linux_sysvec = { 734 .sv_size = LINUX_SYS_MAXSYSCALL, 735 .sv_table = linux_sysent, 736 .sv_transtrap = linux_translate_traps, 737 .sv_fixup = linux_fixup_elf, 738 .sv_sendsig = linux_rt_sendsig, 739 .sv_sigcode = &_binary_linux_locore_o_start, 740 .sv_szsigcode = &linux_szsigcode, 741 .sv_name = "Linux ELF64", 742 .sv_coredump = elf64_coredump, 743 .sv_imgact_try = linux_exec_imgact_try, 744 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 745 .sv_minuser = VM_MIN_ADDRESS, 746 .sv_maxuser = VM_MAXUSER_ADDRESS_LA48, 747 .sv_usrstack = USRSTACK_LA48, 748 .sv_psstrings = PS_STRINGS_LA48, 749 .sv_stackprot = VM_PROT_ALL, 750 .sv_copyout_auxargs = linux_copyout_auxargs, 751 .sv_copyout_strings = linux_copyout_strings, 752 .sv_setregs = linux_exec_setregs, 753 .sv_fixlimit = NULL, 754 .sv_maxssiz = NULL, 755 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP, 756 .sv_set_syscall_retval = linux_set_syscall_retval, 757 .sv_fetch_syscall_args = linux_fetch_syscall_args, 758 .sv_syscallnames = NULL, 759 .sv_shared_page_base = SHAREDPAGE_LA48, 760 .sv_shared_page_len = PAGE_SIZE, 761 .sv_schedtail = linux_schedtail, 762 .sv_thread_detach = linux_thread_detach, 763 .sv_trap = linux_vsyscall, 764 .sv_onexec = linux_on_exec, 765 .sv_onexit = linux_on_exit, 766 .sv_ontdexit = linux_thread_dtor, 767 }; 768 769 static void 770 linux_vdso_install(void *param) 771 { 772 773 amd64_lower_shared_page(&elf_linux_sysvec); 774 775 linux_szsigcode = (&_binary_linux_locore_o_end - 776 &_binary_linux_locore_o_start); 777 778 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 779 panic("Linux invalid vdso size\n"); 780 781 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 782 783 linux_shared_page_obj = __elfN(linux_shared_page_init) 784 (&linux_shared_page_mapping); 785 786 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 787 788 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 789 linux_szsigcode); 790 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 791 792 linux_kplatform = linux_shared_page_mapping + 793 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 794 } 795 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 796 linux_vdso_install, NULL); 797 798 static void 799 linux_vdso_deinstall(void *param) 800 { 801 802 __elfN(linux_shared_page_fini)(linux_shared_page_obj, 803 linux_shared_page_mapping); 804 } 805 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 806 linux_vdso_deinstall, NULL); 807 808 static char GNULINUX_ABI_VENDOR[] = "GNU"; 809 static int GNULINUX_ABI_DESC = 0; 810 811 static bool 812 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 813 { 814 const Elf32_Word *desc; 815 uintptr_t p; 816 817 p = (uintptr_t)(note + 1); 818 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 819 820 desc = (const Elf32_Word *)p; 821 if (desc[0] != GNULINUX_ABI_DESC) 822 return (false); 823 824 /* 825 * For Linux we encode osrel using the Linux convention of 826 * (version << 16) | (major << 8) | (minor) 827 * See macro in linux_mib.h 828 */ 829 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 830 831 return (true); 832 } 833 834 static Elf_Brandnote linux64_brandnote = { 835 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR), 836 .hdr.n_descsz = 16, 837 .hdr.n_type = 1, 838 .vendor = GNULINUX_ABI_VENDOR, 839 .flags = BN_TRANSLATE_OSREL, 840 .trans_osrel = linux_trans_osrel 841 }; 842 843 static Elf64_Brandinfo linux_glibc2brand = { 844 .brand = ELFOSABI_LINUX, 845 .machine = EM_X86_64, 846 .compat_3_brand = "Linux", 847 .emul_path = linux_emul_path, 848 .interp_path = "/lib64/ld-linux-x86-64.so.2", 849 .sysvec = &elf_linux_sysvec, 850 .interp_newpath = NULL, 851 .brand_note = &linux64_brandnote, 852 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 853 }; 854 855 static Elf64_Brandinfo linux_glibc2brandshort = { 856 .brand = ELFOSABI_LINUX, 857 .machine = EM_X86_64, 858 .compat_3_brand = "Linux", 859 .emul_path = linux_emul_path, 860 .interp_path = "/lib64/ld-linux.so.2", 861 .sysvec = &elf_linux_sysvec, 862 .interp_newpath = NULL, 863 .brand_note = &linux64_brandnote, 864 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 865 }; 866 867 static Elf64_Brandinfo linux_muslbrand = { 868 .brand = ELFOSABI_LINUX, 869 .machine = EM_X86_64, 870 .compat_3_brand = "Linux", 871 .emul_path = linux_emul_path, 872 .interp_path = "/lib/ld-musl-x86_64.so.1", 873 .sysvec = &elf_linux_sysvec, 874 .interp_newpath = NULL, 875 .brand_note = &linux64_brandnote, 876 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 877 }; 878 879 Elf64_Brandinfo *linux_brandlist[] = { 880 &linux_glibc2brand, 881 &linux_glibc2brandshort, 882 &linux_muslbrand, 883 NULL 884 }; 885 886 static int 887 linux64_elf_modevent(module_t mod, int type, void *data) 888 { 889 Elf64_Brandinfo **brandinfo; 890 int error; 891 struct linux_ioctl_handler **lihp; 892 893 error = 0; 894 895 switch(type) { 896 case MOD_LOAD: 897 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 898 ++brandinfo) 899 if (elf64_insert_brand_entry(*brandinfo) < 0) 900 error = EINVAL; 901 if (error == 0) { 902 SET_FOREACH(lihp, linux_ioctl_handler_set) 903 linux_ioctl_register_handler(*lihp); 904 stclohz = (stathz ? stathz : hz); 905 if (bootverbose) 906 printf("Linux x86-64 ELF exec handler installed\n"); 907 } else 908 printf("cannot insert Linux x86-64 ELF brand handler\n"); 909 break; 910 case MOD_UNLOAD: 911 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 912 ++brandinfo) 913 if (elf64_brand_inuse(*brandinfo)) 914 error = EBUSY; 915 if (error == 0) { 916 for (brandinfo = &linux_brandlist[0]; 917 *brandinfo != NULL; ++brandinfo) 918 if (elf64_remove_brand_entry(*brandinfo) < 0) 919 error = EINVAL; 920 } 921 if (error == 0) { 922 SET_FOREACH(lihp, linux_ioctl_handler_set) 923 linux_ioctl_unregister_handler(*lihp); 924 if (bootverbose) 925 printf("Linux ELF exec handler removed\n"); 926 } else 927 printf("Could not deinstall ELF interpreter entry\n"); 928 break; 929 default: 930 return (EOPNOTSUPP); 931 } 932 return (error); 933 } 934 935 static moduledata_t linux64_elf_mod = { 936 "linux64elf", 937 linux64_elf_modevent, 938 0 939 }; 940 941 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 942 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); 943 FEATURE(linux64, "Linux 64bit support"); 944