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_futex.h> 79 #include <compat/linux/linux_ioctl.h> 80 #include <compat/linux/linux_mib.h> 81 #include <compat/linux/linux_misc.h> 82 #include <compat/linux/linux_signal.h> 83 #include <compat/linux/linux_sysproto.h> 84 #include <compat/linux/linux_util.h> 85 #include <compat/linux/linux_vdso.h> 86 87 MODULE_VERSION(linux64, 1); 88 89 const char *linux_kplatform; 90 static int linux_szsigcode; 91 static vm_object_t linux_shared_page_obj; 92 static char *linux_shared_page_mapping; 93 extern char _binary_linux_locore_o_start; 94 extern char _binary_linux_locore_o_end; 95 96 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 97 98 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 99 100 static register_t * linux_copyout_strings(struct image_params *imgp); 101 static int linux_fixup_elf(register_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 u_long 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 sa->narg = sa->callp->sy_narg; 202 203 td->td_retval[0] = 0; 204 return (0); 205 } 206 207 static void 208 linux_set_syscall_retval(struct thread *td, int error) 209 { 210 struct trapframe *frame = td->td_frame; 211 212 /* 213 * On Linux only %rcx and %r11 values are not preserved across 214 * the syscall. So, do not clobber %rdx and %r10. 215 */ 216 td->td_retval[1] = frame->tf_rdx; 217 if (error != EJUSTRETURN) 218 frame->tf_r10 = frame->tf_rcx; 219 220 cpu_set_syscall_retval(td, error); 221 222 /* Restore all registers. */ 223 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 224 } 225 226 static int 227 linux_fixup_elf(register_t **stack_base, struct image_params *imgp) 228 { 229 Elf_Auxargs *args; 230 Elf_Auxinfo *argarray, *pos; 231 Elf_Addr *auxbase, *base; 232 struct ps_strings *arginfo; 233 struct proc *p; 234 int error, issetugid; 235 236 p = imgp->proc; 237 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 238 239 KASSERT(curthread->td_proc == imgp->proc, 240 ("unsafe linux_fixup_elf(), should be curproc")); 241 base = (Elf64_Addr *)*stack_base; 242 args = (Elf64_Auxargs *)imgp->auxargs; 243 auxbase = base + imgp->args->argc + 1 + imgp->args->envc + 1; 244 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 245 M_WAITOK | M_ZERO); 246 247 issetugid = p->p_flag & P_SUGID ? 1 : 0; 248 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 249 imgp->proc->p_sysent->sv_shared_page_base); 250 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 251 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 252 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 253 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 254 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 255 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 256 AUXARGS_ENTRY(pos, AT_BASE, args->base); 257 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 258 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 259 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 260 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 261 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 262 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 263 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 264 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 265 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); 266 if (imgp->execpathp != 0) 267 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); 268 if (args->execfd != -1) 269 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 270 AUXARGS_ENTRY(pos, AT_NULL, 0); 271 free(imgp->auxargs, M_TEMP); 272 imgp->auxargs = NULL; 273 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 274 275 error = copyout(argarray, auxbase, sizeof(*argarray) * LINUX_AT_COUNT); 276 free(argarray, M_TEMP); 277 if (error != 0) 278 return (error); 279 280 base--; 281 if (suword(base, (uint64_t)imgp->args->argc) == -1) 282 return (EFAULT); 283 284 *stack_base = (register_t *)base; 285 return (0); 286 } 287 288 /* 289 * Copy strings out to the new process address space, constructing new arg 290 * and env vector tables. Return a pointer to the base so that it can be used 291 * as the initial stack pointer. 292 */ 293 static register_t * 294 linux_copyout_strings(struct image_params *imgp) 295 { 296 int argc, envc; 297 char **vectp; 298 char *stringp, *destp; 299 register_t *stack_base; 300 struct ps_strings *arginfo; 301 char canary[LINUX_AT_RANDOM_LEN]; 302 size_t execpath_len; 303 struct proc *p; 304 305 /* Calculate string base and vector table pointers. */ 306 if (imgp->execpath != NULL && imgp->auxargs != NULL) 307 execpath_len = strlen(imgp->execpath) + 1; 308 else 309 execpath_len = 0; 310 311 p = imgp->proc; 312 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 313 destp = (caddr_t)arginfo - SPARE_USRSPACE - 314 roundup(sizeof(canary), sizeof(char *)) - 315 roundup(execpath_len, sizeof(char *)) - 316 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 317 318 if (execpath_len != 0) { 319 imgp->execpathp = (uintptr_t)arginfo - execpath_len; 320 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 321 } 322 323 /* Prepare the canary for SSP. */ 324 arc4rand(canary, sizeof(canary), 0); 325 imgp->canary = (uintptr_t)arginfo - 326 roundup(execpath_len, sizeof(char *)) - 327 roundup(sizeof(canary), sizeof(char *)); 328 copyout(canary, (void *)imgp->canary, sizeof(canary)); 329 330 vectp = (char **)destp; 331 if (imgp->auxargs) { 332 /* 333 * Allocate room on the stack for the ELF auxargs 334 * array. It has LINUX_AT_COUNT entries. 335 */ 336 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf64_Auxinfo), 337 sizeof(*vectp)); 338 } 339 340 /* 341 * Allocate room for the argv[] and env vectors including the 342 * terminating NULL pointers. 343 */ 344 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 345 346 /* vectp also becomes our initial stack base. */ 347 stack_base = (register_t *)vectp; 348 349 stringp = imgp->args->begin_argv; 350 argc = imgp->args->argc; 351 envc = imgp->args->envc; 352 353 /* Copy out strings - arguments and environment. */ 354 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 355 356 /* Fill in "ps_strings" struct for ps, w, etc. */ 357 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 358 suword(&arginfo->ps_nargvstr, argc); 359 360 /* Fill in argument portion of vector table. */ 361 for (; argc > 0; --argc) { 362 suword(vectp++, (long)(intptr_t)destp); 363 while (*stringp++ != 0) 364 destp++; 365 destp++; 366 } 367 368 /* A null vector table pointer separates the argp's from the envp's. */ 369 suword(vectp++, 0); 370 371 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 372 suword(&arginfo->ps_nenvstr, envc); 373 374 /* Fill in environment portion of vector table. */ 375 for (; envc > 0; --envc) { 376 suword(vectp++, (long)(intptr_t)destp); 377 while (*stringp++ != 0) 378 destp++; 379 destp++; 380 } 381 382 /* The end of the vector table is a null pointer. */ 383 suword(vectp, 0); 384 return (stack_base); 385 } 386 387 /* 388 * Reset registers to default values on exec. 389 */ 390 static void 391 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 392 { 393 struct trapframe *regs; 394 struct pcb *pcb; 395 register_t saved_rflags; 396 397 regs = td->td_frame; 398 pcb = td->td_pcb; 399 400 if (td->td_proc->p_md.md_ldt != NULL) 401 user_ldt_free(td); 402 403 pcb->pcb_fsbase = 0; 404 pcb->pcb_gsbase = 0; 405 clear_pcb_flags(pcb, PCB_32BIT); 406 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 407 set_pcb_flags(pcb, PCB_FULL_IRET); 408 409 saved_rflags = regs->tf_rflags & PSL_T; 410 bzero((char *)regs, sizeof(struct trapframe)); 411 regs->tf_rip = imgp->entry_addr; 412 regs->tf_rsp = stack; 413 regs->tf_rflags = PSL_USER | saved_rflags; 414 regs->tf_ss = _udatasel; 415 regs->tf_cs = _ucodesel; 416 regs->tf_ds = _udatasel; 417 regs->tf_es = _udatasel; 418 regs->tf_fs = _ufssel; 419 regs->tf_gs = _ugssel; 420 regs->tf_flags = TF_HASSEGS; 421 422 /* 423 * Reset the hardware debug registers if they were in use. 424 * They won't have any meaning for the newly exec'd process. 425 */ 426 if (pcb->pcb_flags & PCB_DBREGS) { 427 pcb->pcb_dr0 = 0; 428 pcb->pcb_dr1 = 0; 429 pcb->pcb_dr2 = 0; 430 pcb->pcb_dr3 = 0; 431 pcb->pcb_dr6 = 0; 432 pcb->pcb_dr7 = 0; 433 if (pcb == curpcb) { 434 /* 435 * Clear the debug registers on the running 436 * CPU, otherwise they will end up affecting 437 * the next process we switch to. 438 */ 439 reset_dbregs(); 440 } 441 clear_pcb_flags(pcb, PCB_DBREGS); 442 } 443 444 /* 445 * Drop the FP state if we hold it, so that the process gets a 446 * clean FP state if it uses the FPU again. 447 */ 448 fpstate_drop(td); 449 } 450 451 /* 452 * Copied from amd64/amd64/machdep.c 453 * 454 * XXX fpu state need? don't think so 455 */ 456 int 457 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 458 { 459 struct proc *p; 460 struct l_ucontext uc; 461 struct l_sigcontext *context; 462 struct trapframe *regs; 463 unsigned long rflags; 464 int error; 465 ksiginfo_t ksi; 466 467 regs = td->td_frame; 468 error = copyin((void *)regs->tf_rbx, &uc, sizeof(uc)); 469 if (error != 0) 470 return (error); 471 472 p = td->td_proc; 473 context = &uc.uc_mcontext; 474 rflags = context->sc_rflags; 475 476 /* 477 * Don't allow users to change privileged or reserved flags. 478 */ 479 /* 480 * XXX do allow users to change the privileged flag PSL_RF. 481 * The cpu sets PSL_RF in tf_rflags for faults. Debuggers 482 * should sometimes set it there too. tf_rflags is kept in 483 * the signal context during signal handling and there is no 484 * other place to remember it, so the PSL_RF bit may be 485 * corrupted by the signal handler without us knowing. 486 * Corruption of the PSL_RF bit at worst causes one more or 487 * one less debugger trap, so allowing it is fairly harmless. 488 */ 489 490 #define RFLAG_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 491 if (!RFLAG_SECURE(rflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) { 492 printf("linux_rt_sigreturn: rflags = 0x%lx\n", rflags); 493 return (EINVAL); 494 } 495 496 /* 497 * Don't allow users to load a valid privileged %cs. Let the 498 * hardware check for invalid selectors, excess privilege in 499 * other selectors, invalid %eip's and invalid %esp's. 500 */ 501 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 502 if (!CS_SECURE(context->sc_cs)) { 503 printf("linux_rt_sigreturn: cs = 0x%x\n", context->sc_cs); 504 ksiginfo_init_trap(&ksi); 505 ksi.ksi_signo = SIGBUS; 506 ksi.ksi_code = BUS_OBJERR; 507 ksi.ksi_trapno = T_PROTFLT; 508 ksi.ksi_addr = (void *)regs->tf_rip; 509 trapsignal(td, &ksi); 510 return (EINVAL); 511 } 512 513 PROC_LOCK(p); 514 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask); 515 SIG_CANTMASK(td->td_sigmask); 516 signotify(td); 517 PROC_UNLOCK(p); 518 519 regs->tf_rdi = context->sc_rdi; 520 regs->tf_rsi = context->sc_rsi; 521 regs->tf_rdx = context->sc_rdx; 522 regs->tf_rbp = context->sc_rbp; 523 regs->tf_rbx = context->sc_rbx; 524 regs->tf_rcx = context->sc_rcx; 525 regs->tf_rax = context->sc_rax; 526 regs->tf_rip = context->sc_rip; 527 regs->tf_rsp = context->sc_rsp; 528 regs->tf_r8 = context->sc_r8; 529 regs->tf_r9 = context->sc_r9; 530 regs->tf_r10 = context->sc_r10; 531 regs->tf_r11 = context->sc_r11; 532 regs->tf_r12 = context->sc_r12; 533 regs->tf_r13 = context->sc_r13; 534 regs->tf_r14 = context->sc_r14; 535 regs->tf_r15 = context->sc_r15; 536 regs->tf_cs = context->sc_cs; 537 regs->tf_err = context->sc_err; 538 regs->tf_rflags = rflags; 539 540 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 541 return (EJUSTRETURN); 542 } 543 544 /* 545 * copied from amd64/amd64/machdep.c 546 * 547 * Send an interrupt to process. 548 */ 549 static void 550 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 551 { 552 struct l_rt_sigframe sf, *sfp; 553 struct proc *p; 554 struct thread *td; 555 struct sigacts *psp; 556 caddr_t sp; 557 struct trapframe *regs; 558 int sig, code; 559 int oonstack; 560 561 td = curthread; 562 p = td->td_proc; 563 PROC_LOCK_ASSERT(p, MA_OWNED); 564 sig = ksi->ksi_signo; 565 psp = p->p_sigacts; 566 code = ksi->ksi_code; 567 mtx_assert(&psp->ps_mtx, MA_OWNED); 568 regs = td->td_frame; 569 oonstack = sigonstack(regs->tf_rsp); 570 571 LINUX_CTR4(rt_sendsig, "%p, %d, %p, %u", 572 catcher, sig, mask, code); 573 574 /* Allocate space for the signal handler context. */ 575 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 576 SIGISMEMBER(psp->ps_sigonstack, sig)) { 577 sp = (caddr_t)td->td_sigstk.ss_sp + td->td_sigstk.ss_size - 578 sizeof(struct l_rt_sigframe); 579 } else 580 sp = (caddr_t)regs->tf_rsp - sizeof(struct l_rt_sigframe) - 128; 581 /* Align to 16 bytes. */ 582 sfp = (struct l_rt_sigframe *)((unsigned long)sp & ~0xFul); 583 mtx_unlock(&psp->ps_mtx); 584 585 /* Translate the signal. */ 586 sig = bsd_to_linux_signal(sig); 587 588 /* Save user context. */ 589 bzero(&sf, sizeof(sf)); 590 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_sigmask); 591 bsd_to_linux_sigset(mask, &sf.sf_sc.uc_mcontext.sc_mask); 592 593 sf.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 594 sf.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 595 sf.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 596 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 597 PROC_UNLOCK(p); 598 599 sf.sf_sc.uc_mcontext.sc_rdi = regs->tf_rdi; 600 sf.sf_sc.uc_mcontext.sc_rsi = regs->tf_rsi; 601 sf.sf_sc.uc_mcontext.sc_rdx = regs->tf_rdx; 602 sf.sf_sc.uc_mcontext.sc_rbp = regs->tf_rbp; 603 sf.sf_sc.uc_mcontext.sc_rbx = regs->tf_rbx; 604 sf.sf_sc.uc_mcontext.sc_rcx = regs->tf_rcx; 605 sf.sf_sc.uc_mcontext.sc_rax = regs->tf_rax; 606 sf.sf_sc.uc_mcontext.sc_rip = regs->tf_rip; 607 sf.sf_sc.uc_mcontext.sc_rsp = regs->tf_rsp; 608 sf.sf_sc.uc_mcontext.sc_r8 = regs->tf_r8; 609 sf.sf_sc.uc_mcontext.sc_r9 = regs->tf_r9; 610 sf.sf_sc.uc_mcontext.sc_r10 = regs->tf_r10; 611 sf.sf_sc.uc_mcontext.sc_r11 = regs->tf_r11; 612 sf.sf_sc.uc_mcontext.sc_r12 = regs->tf_r12; 613 sf.sf_sc.uc_mcontext.sc_r13 = regs->tf_r13; 614 sf.sf_sc.uc_mcontext.sc_r14 = regs->tf_r14; 615 sf.sf_sc.uc_mcontext.sc_r15 = regs->tf_r15; 616 sf.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 617 sf.sf_sc.uc_mcontext.sc_rflags = regs->tf_rflags; 618 sf.sf_sc.uc_mcontext.sc_err = regs->tf_err; 619 sf.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 620 sf.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 621 622 /* Build the argument list for the signal handler. */ 623 regs->tf_rdi = sig; /* arg 1 in %rdi */ 624 regs->tf_rax = 0; 625 regs->tf_rsi = (register_t)&sfp->sf_si; /* arg 2 in %rsi */ 626 regs->tf_rdx = (register_t)&sfp->sf_sc; /* arg 3 in %rdx */ 627 628 sf.sf_handler = catcher; 629 /* Fill in POSIX parts. */ 630 ksiginfo_to_lsiginfo(ksi, &sf.sf_si, sig); 631 632 /* Copy the sigframe out to the user's stack. */ 633 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 634 PROC_LOCK(p); 635 sigexit(td, SIGILL); 636 } 637 638 regs->tf_rsp = (long)sfp; 639 regs->tf_rip = linux_rt_sigcode; 640 regs->tf_rflags &= ~(PSL_T | PSL_D); 641 regs->tf_cs = _ucodesel; 642 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 643 PROC_LOCK(p); 644 mtx_lock(&psp->ps_mtx); 645 } 646 647 #define LINUX_VSYSCALL_START (-10UL << 20) 648 #define LINUX_VSYSCALL_SZ 1024 649 650 const unsigned long linux_vsyscall_vector[] = { 651 LINUX_SYS_gettimeofday, 652 LINUX_SYS_linux_time, 653 /* getcpu not implemented */ 654 }; 655 656 static int 657 linux_vsyscall(struct thread *td) 658 { 659 struct trapframe *frame; 660 uint64_t retqaddr; 661 int code, traced; 662 int error; 663 664 frame = td->td_frame; 665 666 /* Check %rip for vsyscall area. */ 667 if (__predict_true(frame->tf_rip < LINUX_VSYSCALL_START)) 668 return (EINVAL); 669 if ((frame->tf_rip & (LINUX_VSYSCALL_SZ - 1)) != 0) 670 return (EINVAL); 671 code = (frame->tf_rip - LINUX_VSYSCALL_START) / LINUX_VSYSCALL_SZ; 672 if (code >= nitems(linux_vsyscall_vector)) 673 return (EINVAL); 674 675 /* 676 * vsyscall called as callq *(%rax), so we must 677 * use return address from %rsp and also fixup %rsp. 678 */ 679 error = copyin((void *)frame->tf_rsp, &retqaddr, sizeof(retqaddr)); 680 if (error) 681 return (error); 682 683 frame->tf_rip = retqaddr; 684 frame->tf_rax = linux_vsyscall_vector[code]; 685 frame->tf_rsp += 8; 686 687 traced = (frame->tf_flags & PSL_T); 688 689 amd64_syscall(td, traced); 690 691 return (0); 692 } 693 694 struct sysentvec elf_linux_sysvec = { 695 .sv_size = LINUX_SYS_MAXSYSCALL, 696 .sv_table = linux_sysent, 697 .sv_errsize = ELAST + 1, 698 .sv_errtbl = linux_errtbl, 699 .sv_transtrap = linux_translate_traps, 700 .sv_fixup = linux_fixup_elf, 701 .sv_sendsig = linux_rt_sendsig, 702 .sv_sigcode = &_binary_linux_locore_o_start, 703 .sv_szsigcode = &linux_szsigcode, 704 .sv_name = "Linux ELF64", 705 .sv_coredump = elf64_coredump, 706 .sv_imgact_try = linux_exec_imgact_try, 707 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 708 .sv_minuser = VM_MIN_ADDRESS, 709 .sv_maxuser = VM_MAXUSER_ADDRESS, 710 .sv_usrstack = USRSTACK, 711 .sv_psstrings = PS_STRINGS, 712 .sv_stackprot = VM_PROT_ALL, 713 .sv_copyout_strings = linux_copyout_strings, 714 .sv_setregs = linux_exec_setregs, 715 .sv_fixlimit = NULL, 716 .sv_maxssiz = NULL, 717 .sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP, 718 .sv_set_syscall_retval = linux_set_syscall_retval, 719 .sv_fetch_syscall_args = linux_fetch_syscall_args, 720 .sv_syscallnames = NULL, 721 .sv_shared_page_base = SHAREDPAGE, 722 .sv_shared_page_len = PAGE_SIZE, 723 .sv_schedtail = linux_schedtail, 724 .sv_thread_detach = linux_thread_detach, 725 .sv_trap = linux_vsyscall, 726 }; 727 728 static void 729 linux_vdso_install(void *param) 730 { 731 732 amd64_lower_shared_page(&elf_linux_sysvec); 733 734 linux_szsigcode = (&_binary_linux_locore_o_end - 735 &_binary_linux_locore_o_start); 736 737 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 738 panic("Linux invalid vdso size\n"); 739 740 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 741 742 linux_shared_page_obj = __elfN(linux_shared_page_init) 743 (&linux_shared_page_mapping); 744 745 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 746 747 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 748 linux_szsigcode); 749 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 750 751 linux_kplatform = linux_shared_page_mapping + 752 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 753 } 754 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 755 linux_vdso_install, NULL); 756 757 static void 758 linux_vdso_deinstall(void *param) 759 { 760 761 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 762 } 763 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 764 linux_vdso_deinstall, NULL); 765 766 static char GNULINUX_ABI_VENDOR[] = "GNU"; 767 static int GNULINUX_ABI_DESC = 0; 768 769 static bool 770 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 771 { 772 const Elf32_Word *desc; 773 uintptr_t p; 774 775 p = (uintptr_t)(note + 1); 776 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 777 778 desc = (const Elf32_Word *)p; 779 if (desc[0] != GNULINUX_ABI_DESC) 780 return (false); 781 782 /* 783 * For Linux we encode osrel using the Linux convention of 784 * (version << 16) | (major << 8) | (minor) 785 * See macro in linux_mib.h 786 */ 787 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 788 789 return (true); 790 } 791 792 static Elf_Brandnote linux64_brandnote = { 793 .hdr.n_namesz = sizeof(GNULINUX_ABI_VENDOR), 794 .hdr.n_descsz = 16, 795 .hdr.n_type = 1, 796 .vendor = GNULINUX_ABI_VENDOR, 797 .flags = BN_TRANSLATE_OSREL, 798 .trans_osrel = linux_trans_osrel 799 }; 800 801 static Elf64_Brandinfo linux_glibc2brand = { 802 .brand = ELFOSABI_LINUX, 803 .machine = EM_X86_64, 804 .compat_3_brand = "Linux", 805 .emul_path = "/compat/linux", 806 .interp_path = "/lib64/ld-linux-x86-64.so.2", 807 .sysvec = &elf_linux_sysvec, 808 .interp_newpath = NULL, 809 .brand_note = &linux64_brandnote, 810 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 811 }; 812 813 static Elf64_Brandinfo linux_glibc2brandshort = { 814 .brand = ELFOSABI_LINUX, 815 .machine = EM_X86_64, 816 .compat_3_brand = "Linux", 817 .emul_path = "/compat/linux", 818 .interp_path = "/lib64/ld-linux.so.2", 819 .sysvec = &elf_linux_sysvec, 820 .interp_newpath = NULL, 821 .brand_note = &linux64_brandnote, 822 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 823 }; 824 825 static Elf64_Brandinfo linux_muslbrand = { 826 .brand = ELFOSABI_LINUX, 827 .machine = EM_X86_64, 828 .compat_3_brand = "Linux", 829 .emul_path = "/compat/linux", 830 .interp_path = "/lib/ld-musl-x86_64.so.1", 831 .sysvec = &elf_linux_sysvec, 832 .interp_newpath = NULL, 833 .brand_note = &linux64_brandnote, 834 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 835 }; 836 837 Elf64_Brandinfo *linux_brandlist[] = { 838 &linux_glibc2brand, 839 &linux_glibc2brandshort, 840 &linux_muslbrand, 841 NULL 842 }; 843 844 static int 845 linux64_elf_modevent(module_t mod, int type, void *data) 846 { 847 Elf64_Brandinfo **brandinfo; 848 int error; 849 struct linux_ioctl_handler **lihp; 850 851 error = 0; 852 853 switch(type) { 854 case MOD_LOAD: 855 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 856 ++brandinfo) 857 if (elf64_insert_brand_entry(*brandinfo) < 0) 858 error = EINVAL; 859 if (error == 0) { 860 SET_FOREACH(lihp, linux_ioctl_handler_set) 861 linux_ioctl_register_handler(*lihp); 862 LIST_INIT(&futex_list); 863 mtx_init(&futex_mtx, "ftllk64", NULL, MTX_DEF); 864 stclohz = (stathz ? stathz : hz); 865 if (bootverbose) 866 printf("Linux x86-64 ELF exec handler installed\n"); 867 } else 868 printf("cannot insert Linux x86-64 ELF brand handler\n"); 869 break; 870 case MOD_UNLOAD: 871 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 872 ++brandinfo) 873 if (elf64_brand_inuse(*brandinfo)) 874 error = EBUSY; 875 if (error == 0) { 876 for (brandinfo = &linux_brandlist[0]; 877 *brandinfo != NULL; ++brandinfo) 878 if (elf64_remove_brand_entry(*brandinfo) < 0) 879 error = EINVAL; 880 } 881 if (error == 0) { 882 SET_FOREACH(lihp, linux_ioctl_handler_set) 883 linux_ioctl_unregister_handler(*lihp); 884 mtx_destroy(&futex_mtx); 885 if (bootverbose) 886 printf("Linux ELF exec handler removed\n"); 887 } else 888 printf("Could not deinstall ELF interpreter entry\n"); 889 break; 890 default: 891 return (EOPNOTSUPP); 892 } 893 return (error); 894 } 895 896 static moduledata_t linux64_elf_mod = { 897 "linux64elf", 898 linux64_elf_modevent, 899 0 900 }; 901 902 DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 903 MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1); 904 FEATURE(linux64, "Linux 64bit support"); 905