1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1994-1996 Søren Schmidt 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/exec.h> 35 #include <sys/fcntl.h> 36 #include <sys/imgact.h> 37 #include <sys/imgact_aout.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/module.h> 43 #include <sys/mutex.h> 44 #include <sys/proc.h> 45 #include <sys/signalvar.h> 46 #include <sys/syscallsubr.h> 47 #include <sys/sysctl.h> 48 #include <sys/sysent.h> 49 #include <sys/sysproto.h> 50 #include <sys/vnode.h> 51 #include <sys/eventhandler.h> 52 53 #include <vm/vm.h> 54 #include <vm/pmap.h> 55 #include <vm/vm_extern.h> 56 #include <vm/vm_map.h> 57 #include <vm/vm_object.h> 58 #include <vm/vm_page.h> 59 #include <vm/vm_param.h> 60 61 #include <machine/cpu.h> 62 #include <machine/cputypes.h> 63 #include <machine/md_var.h> 64 #include <machine/pcb.h> 65 66 #include <i386/linux/linux.h> 67 #include <i386/linux/linux_proto.h> 68 #include <compat/linux/linux_emul.h> 69 #include <compat/linux/linux_futex.h> 70 #include <compat/linux/linux_ioctl.h> 71 #include <compat/linux/linux_mib.h> 72 #include <compat/linux/linux_misc.h> 73 #include <compat/linux/linux_signal.h> 74 #include <compat/linux/linux_util.h> 75 #include <compat/linux/linux_vdso.h> 76 77 MODULE_VERSION(linux, 1); 78 79 #if BYTE_ORDER == LITTLE_ENDIAN 80 #define SHELLMAGIC 0x2123 /* #! */ 81 #else 82 #define SHELLMAGIC 0x2321 83 #endif 84 85 #if defined(DEBUG) 86 SYSCTL_PROC(_compat_linux, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 87 linux_sysctl_debug, "A", "Linux debugging control"); 88 #endif 89 90 /* 91 * Allow the sendsig functions to use the ldebug() facility 92 * even though they are not syscalls themselves. Map them 93 * to syscall 0. This is slightly less bogus than using 94 * ldebug(sigreturn). 95 */ 96 #define LINUX_SYS_linux_rt_sendsig 0 97 #define LINUX_SYS_linux_sendsig 0 98 99 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 100 101 static int linux_szsigcode; 102 static vm_object_t linux_shared_page_obj; 103 static char *linux_shared_page_mapping; 104 extern char _binary_linux_locore_o_start; 105 extern char _binary_linux_locore_o_end; 106 107 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 108 109 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 110 111 static int linux_fixup(register_t **stack_base, 112 struct image_params *iparams); 113 static int elf_linux_fixup(register_t **stack_base, 114 struct image_params *iparams); 115 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 116 static void exec_linux_setregs(struct thread *td, 117 struct image_params *imgp, u_long stack); 118 static register_t *linux_copyout_strings(struct image_params *imgp); 119 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 120 static void linux_vdso_install(void *param); 121 static void linux_vdso_deinstall(void *param); 122 123 static int linux_szplatform; 124 const char *linux_kplatform; 125 126 static eventhandler_tag linux_exit_tag; 127 static eventhandler_tag linux_exec_tag; 128 static eventhandler_tag linux_thread_dtor_tag; 129 130 /* 131 * Linux syscalls return negative errno's, we do positive and map them 132 * Reference: 133 * FreeBSD: src/sys/sys/errno.h 134 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 135 * linux-2.6.17.8/include/asm-generic/errno.h 136 */ 137 static int bsd_to_linux_errno[ELAST + 1] = { 138 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 139 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 140 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 141 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 142 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 143 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 144 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 145 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 146 -6, -6, -43, -42, -75,-125, -84, -61, -16, -74, 147 -72, -67, -71 148 }; 149 150 #define LINUX_T_UNKNOWN 255 151 static int _bsd_to_linux_trapcode[] = { 152 LINUX_T_UNKNOWN, /* 0 */ 153 6, /* 1 T_PRIVINFLT */ 154 LINUX_T_UNKNOWN, /* 2 */ 155 3, /* 3 T_BPTFLT */ 156 LINUX_T_UNKNOWN, /* 4 */ 157 LINUX_T_UNKNOWN, /* 5 */ 158 16, /* 6 T_ARITHTRAP */ 159 254, /* 7 T_ASTFLT */ 160 LINUX_T_UNKNOWN, /* 8 */ 161 13, /* 9 T_PROTFLT */ 162 1, /* 10 T_TRCTRAP */ 163 LINUX_T_UNKNOWN, /* 11 */ 164 14, /* 12 T_PAGEFLT */ 165 LINUX_T_UNKNOWN, /* 13 */ 166 17, /* 14 T_ALIGNFLT */ 167 LINUX_T_UNKNOWN, /* 15 */ 168 LINUX_T_UNKNOWN, /* 16 */ 169 LINUX_T_UNKNOWN, /* 17 */ 170 0, /* 18 T_DIVIDE */ 171 2, /* 19 T_NMI */ 172 4, /* 20 T_OFLOW */ 173 5, /* 21 T_BOUND */ 174 7, /* 22 T_DNA */ 175 8, /* 23 T_DOUBLEFLT */ 176 9, /* 24 T_FPOPFLT */ 177 10, /* 25 T_TSSFLT */ 178 11, /* 26 T_SEGNPFLT */ 179 12, /* 27 T_STKFLT */ 180 18, /* 28 T_MCHK */ 181 19, /* 29 T_XMMFLT */ 182 15 /* 30 T_RESERVED */ 183 }; 184 #define bsd_to_linux_trapcode(code) \ 185 ((code)<nitems(_bsd_to_linux_trapcode)? \ 186 _bsd_to_linux_trapcode[(code)]: \ 187 LINUX_T_UNKNOWN) 188 189 LINUX_VDSO_SYM_INTPTR(linux_sigcode); 190 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 191 LINUX_VDSO_SYM_INTPTR(linux_vsyscall); 192 193 /* 194 * If FreeBSD & Linux have a difference of opinion about what a trap 195 * means, deal with it here. 196 * 197 * MPSAFE 198 */ 199 static int 200 translate_traps(int signal, int trap_code) 201 { 202 if (signal != SIGBUS) 203 return (signal); 204 switch (trap_code) { 205 case T_PROTFLT: 206 case T_TSSFLT: 207 case T_DOUBLEFLT: 208 case T_PAGEFLT: 209 return (SIGSEGV); 210 default: 211 return (signal); 212 } 213 } 214 215 static int 216 linux_fixup(register_t **stack_base, struct image_params *imgp) 217 { 218 register_t *argv, *envp; 219 220 argv = *stack_base; 221 envp = *stack_base + (imgp->args->argc + 1); 222 (*stack_base)--; 223 suword(*stack_base, (intptr_t)(void *)envp); 224 (*stack_base)--; 225 suword(*stack_base, (intptr_t)(void *)argv); 226 (*stack_base)--; 227 suword(*stack_base, imgp->args->argc); 228 return (0); 229 } 230 231 static int 232 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 233 { 234 struct proc *p; 235 Elf32_Auxargs *args; 236 Elf32_Addr *uplatform; 237 struct ps_strings *arginfo; 238 register_t *pos; 239 int issetugid; 240 241 KASSERT(curthread->td_proc == imgp->proc, 242 ("unsafe elf_linux_fixup(), should be curproc")); 243 244 p = imgp->proc; 245 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 246 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 247 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); 248 args = (Elf32_Auxargs *)imgp->auxargs; 249 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 250 251 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 252 imgp->proc->p_sysent->sv_shared_page_base); 253 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); 254 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 255 256 /* 257 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 258 * as it has appeared in the 2.4.0-rc7 first time. 259 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 260 * glibc falls back to the hard-coded CLK_TCK value when aux entry 261 * is not present. 262 * Also see linux_times() implementation. 263 */ 264 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 265 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 266 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 267 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 268 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 269 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 270 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 271 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 272 AUXARGS_ENTRY(pos, AT_BASE, args->base); 273 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 274 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 275 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 276 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 277 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 278 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 279 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); 280 if (imgp->execpathp != 0) 281 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); 282 if (args->execfd != -1) 283 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 284 AUXARGS_ENTRY(pos, AT_NULL, 0); 285 286 free(imgp->auxargs, M_TEMP); 287 imgp->auxargs = NULL; 288 289 (*stack_base)--; 290 suword(*stack_base, (register_t)imgp->args->argc); 291 return (0); 292 } 293 294 /* 295 * Copied from kern/kern_exec.c 296 */ 297 static register_t * 298 linux_copyout_strings(struct image_params *imgp) 299 { 300 int argc, envc; 301 char **vectp; 302 char *stringp, *destp; 303 register_t *stack_base; 304 struct ps_strings *arginfo; 305 char canary[LINUX_AT_RANDOM_LEN]; 306 size_t execpath_len; 307 struct proc *p; 308 309 /* 310 * Calculate string base and vector table pointers. 311 */ 312 p = imgp->proc; 313 if (imgp->execpath != NULL && imgp->auxargs != NULL) 314 execpath_len = strlen(imgp->execpath) + 1; 315 else 316 execpath_len = 0; 317 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 318 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - 319 roundup(sizeof(canary), sizeof(char *)) - 320 roundup(execpath_len, sizeof(char *)) - 321 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 322 323 /* 324 * install LINUX_PLATFORM 325 */ 326 copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform), 327 linux_szplatform); 328 329 if (execpath_len != 0) { 330 imgp->execpathp = (uintptr_t)arginfo - 331 linux_szplatform - execpath_len; 332 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 333 } 334 335 /* 336 * Prepare the canary for SSP. 337 */ 338 arc4rand(canary, sizeof(canary), 0); 339 imgp->canary = (uintptr_t)arginfo - linux_szplatform - 340 roundup(execpath_len, sizeof(char *)) - 341 roundup(sizeof(canary), sizeof(char *)); 342 copyout(canary, (void *)imgp->canary, sizeof(canary)); 343 344 /* 345 * If we have a valid auxargs ptr, prepare some room 346 * on the stack. 347 */ 348 if (imgp->auxargs) { 349 /* 350 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 351 * lower compatibility. 352 */ 353 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 354 (LINUX_AT_COUNT * 2); 355 /* 356 * The '+ 2' is for the null pointers at the end of each of 357 * the arg and env vector sets,and imgp->auxarg_size is room 358 * for argument of Runtime loader. 359 */ 360 vectp = (char **)(destp - (imgp->args->argc + 361 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 362 } else { 363 /* 364 * The '+ 2' is for the null pointers at the end of each of 365 * the arg and env vector sets 366 */ 367 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 368 sizeof(char *)); 369 } 370 371 /* 372 * vectp also becomes our initial stack base 373 */ 374 stack_base = (register_t *)vectp; 375 376 stringp = imgp->args->begin_argv; 377 argc = imgp->args->argc; 378 envc = imgp->args->envc; 379 380 /* 381 * Copy out strings - arguments and environment. 382 */ 383 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 384 385 /* 386 * Fill in "ps_strings" struct for ps, w, etc. 387 */ 388 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 389 suword(&arginfo->ps_nargvstr, argc); 390 391 /* 392 * Fill in argument portion of vector table. 393 */ 394 for (; argc > 0; --argc) { 395 suword(vectp++, (long)(intptr_t)destp); 396 while (*stringp++ != 0) 397 destp++; 398 destp++; 399 } 400 401 /* a null vector table pointer separates the argp's from the envp's */ 402 suword(vectp++, 0); 403 404 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 405 suword(&arginfo->ps_nenvstr, envc); 406 407 /* 408 * Fill in environment portion of vector table. 409 */ 410 for (; envc > 0; --envc) { 411 suword(vectp++, (long)(intptr_t)destp); 412 while (*stringp++ != 0) 413 destp++; 414 destp++; 415 } 416 417 /* end of vector table is a null pointer */ 418 suword(vectp, 0); 419 420 return (stack_base); 421 } 422 423 static void 424 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 425 { 426 struct thread *td = curthread; 427 struct proc *p = td->td_proc; 428 struct sigacts *psp; 429 struct trapframe *regs; 430 struct l_rt_sigframe *fp, frame; 431 int sig, code; 432 int oonstack; 433 434 sig = ksi->ksi_signo; 435 code = ksi->ksi_code; 436 PROC_LOCK_ASSERT(p, MA_OWNED); 437 psp = p->p_sigacts; 438 mtx_assert(&psp->ps_mtx, MA_OWNED); 439 regs = td->td_frame; 440 oonstack = sigonstack(regs->tf_esp); 441 442 #ifdef DEBUG 443 if (ldebug(rt_sendsig)) 444 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 445 catcher, sig, (void*)mask, code); 446 #endif 447 /* 448 * Allocate space for the signal handler context. 449 */ 450 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 451 SIGISMEMBER(psp->ps_sigonstack, sig)) { 452 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 453 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 454 } else 455 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 456 mtx_unlock(&psp->ps_mtx); 457 458 /* 459 * Build the argument list for the signal handler. 460 */ 461 sig = bsd_to_linux_signal(sig); 462 463 bzero(&frame, sizeof(frame)); 464 465 frame.sf_handler = catcher; 466 frame.sf_sig = sig; 467 frame.sf_siginfo = &fp->sf_si; 468 frame.sf_ucontext = &fp->sf_sc; 469 470 /* Fill in POSIX parts */ 471 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 472 473 /* 474 * Build the signal context to be used by sigreturn. 475 */ 476 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 477 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 478 479 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 480 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 481 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 482 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 483 PROC_UNLOCK(p); 484 485 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 486 487 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 488 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 489 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 490 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 491 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 492 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 493 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 494 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 495 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 496 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 497 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 498 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 499 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 500 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 501 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 502 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 503 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 504 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 505 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 506 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 507 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 508 509 #ifdef DEBUG 510 if (ldebug(rt_sendsig)) 511 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 512 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 513 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 514 #endif 515 516 if (copyout(&frame, fp, sizeof(frame)) != 0) { 517 /* 518 * Process has trashed its stack; give it an illegal 519 * instruction to halt it in its tracks. 520 */ 521 #ifdef DEBUG 522 if (ldebug(rt_sendsig)) 523 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 524 fp, oonstack); 525 #endif 526 PROC_LOCK(p); 527 sigexit(td, SIGILL); 528 } 529 530 /* 531 * Build context to run handler in. 532 */ 533 regs->tf_esp = (int)fp; 534 regs->tf_eip = linux_rt_sigcode; 535 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 536 regs->tf_cs = _ucodesel; 537 regs->tf_ds = _udatasel; 538 regs->tf_es = _udatasel; 539 regs->tf_fs = _udatasel; 540 regs->tf_ss = _udatasel; 541 PROC_LOCK(p); 542 mtx_lock(&psp->ps_mtx); 543 } 544 545 546 /* 547 * Send an interrupt to process. 548 * 549 * Stack is set up to allow sigcode stored 550 * in u. to call routine, followed by kcall 551 * to sigreturn routine below. After sigreturn 552 * resets the signal mask, the stack, and the 553 * frame pointer, it returns to the user 554 * specified pc, psl. 555 */ 556 static void 557 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 558 { 559 struct thread *td = curthread; 560 struct proc *p = td->td_proc; 561 struct sigacts *psp; 562 struct trapframe *regs; 563 struct l_sigframe *fp, frame; 564 l_sigset_t lmask; 565 int sig, code; 566 int oonstack; 567 568 PROC_LOCK_ASSERT(p, MA_OWNED); 569 psp = p->p_sigacts; 570 sig = ksi->ksi_signo; 571 code = ksi->ksi_code; 572 mtx_assert(&psp->ps_mtx, MA_OWNED); 573 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 574 /* Signal handler installed with SA_SIGINFO. */ 575 linux_rt_sendsig(catcher, ksi, mask); 576 return; 577 } 578 regs = td->td_frame; 579 oonstack = sigonstack(regs->tf_esp); 580 581 #ifdef DEBUG 582 if (ldebug(sendsig)) 583 printf(ARGS(sendsig, "%p, %d, %p, %u"), 584 catcher, sig, (void*)mask, code); 585 #endif 586 587 /* 588 * Allocate space for the signal handler context. 589 */ 590 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 591 SIGISMEMBER(psp->ps_sigonstack, sig)) { 592 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 593 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 594 } else 595 fp = (struct l_sigframe *)regs->tf_esp - 1; 596 mtx_unlock(&psp->ps_mtx); 597 PROC_UNLOCK(p); 598 599 /* 600 * Build the argument list for the signal handler. 601 */ 602 sig = bsd_to_linux_signal(sig); 603 604 bzero(&frame, sizeof(frame)); 605 606 frame.sf_handler = catcher; 607 frame.sf_sig = sig; 608 609 bsd_to_linux_sigset(mask, &lmask); 610 611 /* 612 * Build the signal context to be used by sigreturn. 613 */ 614 frame.sf_sc.sc_mask = lmask.__mask; 615 frame.sf_sc.sc_gs = rgs(); 616 frame.sf_sc.sc_fs = regs->tf_fs; 617 frame.sf_sc.sc_es = regs->tf_es; 618 frame.sf_sc.sc_ds = regs->tf_ds; 619 frame.sf_sc.sc_edi = regs->tf_edi; 620 frame.sf_sc.sc_esi = regs->tf_esi; 621 frame.sf_sc.sc_ebp = regs->tf_ebp; 622 frame.sf_sc.sc_ebx = regs->tf_ebx; 623 frame.sf_sc.sc_esp = regs->tf_esp; 624 frame.sf_sc.sc_edx = regs->tf_edx; 625 frame.sf_sc.sc_ecx = regs->tf_ecx; 626 frame.sf_sc.sc_eax = regs->tf_eax; 627 frame.sf_sc.sc_eip = regs->tf_eip; 628 frame.sf_sc.sc_cs = regs->tf_cs; 629 frame.sf_sc.sc_eflags = regs->tf_eflags; 630 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 631 frame.sf_sc.sc_ss = regs->tf_ss; 632 frame.sf_sc.sc_err = regs->tf_err; 633 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 634 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 635 636 frame.sf_extramask[0] = lmask.__mask; 637 638 if (copyout(&frame, fp, sizeof(frame)) != 0) { 639 /* 640 * Process has trashed its stack; give it an illegal 641 * instruction to halt it in its tracks. 642 */ 643 PROC_LOCK(p); 644 sigexit(td, SIGILL); 645 } 646 647 /* 648 * Build context to run handler in. 649 */ 650 regs->tf_esp = (int)fp; 651 regs->tf_eip = linux_sigcode; 652 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 653 regs->tf_cs = _ucodesel; 654 regs->tf_ds = _udatasel; 655 regs->tf_es = _udatasel; 656 regs->tf_fs = _udatasel; 657 regs->tf_ss = _udatasel; 658 PROC_LOCK(p); 659 mtx_lock(&psp->ps_mtx); 660 } 661 662 /* 663 * System call to cleanup state after a signal 664 * has been taken. Reset signal mask and 665 * stack state from context left by sendsig (above). 666 * Return to previous pc and psl as specified by 667 * context left by sendsig. Check carefully to 668 * make sure that the user has not modified the 669 * psl to gain improper privileges or to cause 670 * a machine fault. 671 */ 672 int 673 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 674 { 675 struct l_sigframe frame; 676 struct trapframe *regs; 677 l_sigset_t lmask; 678 sigset_t bmask; 679 int eflags; 680 ksiginfo_t ksi; 681 682 regs = td->td_frame; 683 684 #ifdef DEBUG 685 if (ldebug(sigreturn)) 686 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 687 #endif 688 /* 689 * The trampoline code hands us the sigframe. 690 * It is unsafe to keep track of it ourselves, in the event that a 691 * program jumps out of a signal handler. 692 */ 693 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 694 return (EFAULT); 695 696 /* 697 * Check for security violations. 698 */ 699 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 700 eflags = frame.sf_sc.sc_eflags; 701 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 702 return (EINVAL); 703 704 /* 705 * Don't allow users to load a valid privileged %cs. Let the 706 * hardware check for invalid selectors, excess privilege in 707 * other selectors, invalid %eip's and invalid %esp's. 708 */ 709 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 710 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 711 ksiginfo_init_trap(&ksi); 712 ksi.ksi_signo = SIGBUS; 713 ksi.ksi_code = BUS_OBJERR; 714 ksi.ksi_trapno = T_PROTFLT; 715 ksi.ksi_addr = (void *)regs->tf_eip; 716 trapsignal(td, &ksi); 717 return (EINVAL); 718 } 719 720 lmask.__mask = frame.sf_sc.sc_mask; 721 linux_to_bsd_sigset(&lmask, &bmask); 722 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 723 724 /* 725 * Restore signal context. 726 */ 727 /* %gs was restored by the trampoline. */ 728 regs->tf_fs = frame.sf_sc.sc_fs; 729 regs->tf_es = frame.sf_sc.sc_es; 730 regs->tf_ds = frame.sf_sc.sc_ds; 731 regs->tf_edi = frame.sf_sc.sc_edi; 732 regs->tf_esi = frame.sf_sc.sc_esi; 733 regs->tf_ebp = frame.sf_sc.sc_ebp; 734 regs->tf_ebx = frame.sf_sc.sc_ebx; 735 regs->tf_edx = frame.sf_sc.sc_edx; 736 regs->tf_ecx = frame.sf_sc.sc_ecx; 737 regs->tf_eax = frame.sf_sc.sc_eax; 738 regs->tf_eip = frame.sf_sc.sc_eip; 739 regs->tf_cs = frame.sf_sc.sc_cs; 740 regs->tf_eflags = eflags; 741 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 742 regs->tf_ss = frame.sf_sc.sc_ss; 743 744 return (EJUSTRETURN); 745 } 746 747 /* 748 * System call to cleanup state after a signal 749 * has been taken. Reset signal mask and 750 * stack state from context left by rt_sendsig (above). 751 * Return to previous pc and psl as specified by 752 * context left by sendsig. Check carefully to 753 * make sure that the user has not modified the 754 * psl to gain improper privileges or to cause 755 * a machine fault. 756 */ 757 int 758 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 759 { 760 struct l_ucontext uc; 761 struct l_sigcontext *context; 762 sigset_t bmask; 763 l_stack_t *lss; 764 stack_t ss; 765 struct trapframe *regs; 766 int eflags; 767 ksiginfo_t ksi; 768 769 regs = td->td_frame; 770 771 #ifdef DEBUG 772 if (ldebug(rt_sigreturn)) 773 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 774 #endif 775 /* 776 * The trampoline code hands us the ucontext. 777 * It is unsafe to keep track of it ourselves, in the event that a 778 * program jumps out of a signal handler. 779 */ 780 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 781 return (EFAULT); 782 783 context = &uc.uc_mcontext; 784 785 /* 786 * Check for security violations. 787 */ 788 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 789 eflags = context->sc_eflags; 790 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 791 return (EINVAL); 792 793 /* 794 * Don't allow users to load a valid privileged %cs. Let the 795 * hardware check for invalid selectors, excess privilege in 796 * other selectors, invalid %eip's and invalid %esp's. 797 */ 798 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 799 if (!CS_SECURE(context->sc_cs)) { 800 ksiginfo_init_trap(&ksi); 801 ksi.ksi_signo = SIGBUS; 802 ksi.ksi_code = BUS_OBJERR; 803 ksi.ksi_trapno = T_PROTFLT; 804 ksi.ksi_addr = (void *)regs->tf_eip; 805 trapsignal(td, &ksi); 806 return (EINVAL); 807 } 808 809 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 810 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 811 812 /* 813 * Restore signal context 814 */ 815 /* %gs was restored by the trampoline. */ 816 regs->tf_fs = context->sc_fs; 817 regs->tf_es = context->sc_es; 818 regs->tf_ds = context->sc_ds; 819 regs->tf_edi = context->sc_edi; 820 regs->tf_esi = context->sc_esi; 821 regs->tf_ebp = context->sc_ebp; 822 regs->tf_ebx = context->sc_ebx; 823 regs->tf_edx = context->sc_edx; 824 regs->tf_ecx = context->sc_ecx; 825 regs->tf_eax = context->sc_eax; 826 regs->tf_eip = context->sc_eip; 827 regs->tf_cs = context->sc_cs; 828 regs->tf_eflags = eflags; 829 regs->tf_esp = context->sc_esp_at_signal; 830 regs->tf_ss = context->sc_ss; 831 832 /* 833 * call sigaltstack & ignore results.. 834 */ 835 lss = &uc.uc_stack; 836 ss.ss_sp = lss->ss_sp; 837 ss.ss_size = lss->ss_size; 838 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 839 840 #ifdef DEBUG 841 if (ldebug(rt_sigreturn)) 842 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 843 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 844 #endif 845 (void)kern_sigaltstack(td, &ss, NULL); 846 847 return (EJUSTRETURN); 848 } 849 850 static int 851 linux_fetch_syscall_args(struct thread *td) 852 { 853 struct proc *p; 854 struct trapframe *frame; 855 struct syscall_args *sa; 856 857 p = td->td_proc; 858 frame = td->td_frame; 859 sa = &td->td_sa; 860 861 sa->code = frame->tf_eax; 862 sa->args[0] = frame->tf_ebx; 863 sa->args[1] = frame->tf_ecx; 864 sa->args[2] = frame->tf_edx; 865 sa->args[3] = frame->tf_esi; 866 sa->args[4] = frame->tf_edi; 867 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 868 869 if (sa->code >= p->p_sysent->sv_size) 870 /* nosys */ 871 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 872 else 873 sa->callp = &p->p_sysent->sv_table[sa->code]; 874 sa->narg = sa->callp->sy_narg; 875 876 td->td_retval[0] = 0; 877 td->td_retval[1] = frame->tf_edx; 878 879 return (0); 880 } 881 882 /* 883 * If a Linux binary is exec'ing something, try this image activator 884 * first. We override standard shell script execution in order to 885 * be able to modify the interpreter path. We only do this if a Linux 886 * binary is doing the exec, so we do not create an EXEC module for it. 887 */ 888 static int exec_linux_imgact_try(struct image_params *iparams); 889 890 static int 891 exec_linux_imgact_try(struct image_params *imgp) 892 { 893 const char *head = (const char *)imgp->image_header; 894 char *rpath; 895 int error = -1; 896 897 /* 898 * The interpreter for shell scripts run from a Linux binary needs 899 * to be located in /compat/linux if possible in order to recursively 900 * maintain Linux path emulation. 901 */ 902 if (((const short *)head)[0] == SHELLMAGIC) { 903 /* 904 * Run our normal shell image activator. If it succeeds attempt 905 * to use the alternate path for the interpreter. If an alternate 906 * path is found, use our stringspace to store it. 907 */ 908 if ((error = exec_shell_imgact(imgp)) == 0) { 909 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 910 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 911 if (rpath != NULL) 912 imgp->args->fname_buf = 913 imgp->interpreter_name = rpath; 914 } 915 } 916 return (error); 917 } 918 919 /* 920 * exec_setregs may initialize some registers differently than Linux 921 * does, thus potentially confusing Linux binaries. If necessary, we 922 * override the exec_setregs default(s) here. 923 */ 924 static void 925 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 926 { 927 struct pcb *pcb = td->td_pcb; 928 929 exec_setregs(td, imgp, stack); 930 931 /* Linux sets %gs to 0, we default to _udatasel */ 932 pcb->pcb_gs = 0; 933 load_gs(0); 934 935 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 936 } 937 938 static void 939 linux_get_machine(const char **dst) 940 { 941 942 switch (cpu_class) { 943 case CPUCLASS_686: 944 *dst = "i686"; 945 break; 946 case CPUCLASS_586: 947 *dst = "i586"; 948 break; 949 case CPUCLASS_486: 950 *dst = "i486"; 951 break; 952 default: 953 *dst = "i386"; 954 } 955 } 956 957 struct sysentvec linux_sysvec = { 958 .sv_size = LINUX_SYS_MAXSYSCALL, 959 .sv_table = linux_sysent, 960 .sv_mask = 0, 961 .sv_errsize = ELAST + 1, 962 .sv_errtbl = bsd_to_linux_errno, 963 .sv_transtrap = translate_traps, 964 .sv_fixup = linux_fixup, 965 .sv_sendsig = linux_sendsig, 966 .sv_sigcode = &_binary_linux_locore_o_start, 967 .sv_szsigcode = &linux_szsigcode, 968 .sv_name = "Linux a.out", 969 .sv_coredump = NULL, 970 .sv_imgact_try = exec_linux_imgact_try, 971 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 972 .sv_pagesize = PAGE_SIZE, 973 .sv_minuser = VM_MIN_ADDRESS, 974 .sv_maxuser = VM_MAXUSER_ADDRESS, 975 .sv_usrstack = LINUX_USRSTACK, 976 .sv_psstrings = PS_STRINGS, 977 .sv_stackprot = VM_PROT_ALL, 978 .sv_copyout_strings = exec_copyout_strings, 979 .sv_setregs = exec_linux_setregs, 980 .sv_fixlimit = NULL, 981 .sv_maxssiz = NULL, 982 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 983 .sv_set_syscall_retval = cpu_set_syscall_retval, 984 .sv_fetch_syscall_args = linux_fetch_syscall_args, 985 .sv_syscallnames = NULL, 986 .sv_shared_page_base = LINUX_SHAREDPAGE, 987 .sv_shared_page_len = PAGE_SIZE, 988 .sv_schedtail = linux_schedtail, 989 .sv_thread_detach = linux_thread_detach, 990 .sv_trap = NULL, 991 }; 992 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 993 994 struct sysentvec elf_linux_sysvec = { 995 .sv_size = LINUX_SYS_MAXSYSCALL, 996 .sv_table = linux_sysent, 997 .sv_mask = 0, 998 .sv_errsize = ELAST + 1, 999 .sv_errtbl = bsd_to_linux_errno, 1000 .sv_transtrap = translate_traps, 1001 .sv_fixup = elf_linux_fixup, 1002 .sv_sendsig = linux_sendsig, 1003 .sv_sigcode = &_binary_linux_locore_o_start, 1004 .sv_szsigcode = &linux_szsigcode, 1005 .sv_name = "Linux ELF", 1006 .sv_coredump = elf32_coredump, 1007 .sv_imgact_try = exec_linux_imgact_try, 1008 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1009 .sv_pagesize = PAGE_SIZE, 1010 .sv_minuser = VM_MIN_ADDRESS, 1011 .sv_maxuser = VM_MAXUSER_ADDRESS, 1012 .sv_usrstack = LINUX_USRSTACK, 1013 .sv_psstrings = LINUX_PS_STRINGS, 1014 .sv_stackprot = VM_PROT_ALL, 1015 .sv_copyout_strings = linux_copyout_strings, 1016 .sv_setregs = exec_linux_setregs, 1017 .sv_fixlimit = NULL, 1018 .sv_maxssiz = NULL, 1019 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, 1020 .sv_set_syscall_retval = cpu_set_syscall_retval, 1021 .sv_fetch_syscall_args = linux_fetch_syscall_args, 1022 .sv_syscallnames = NULL, 1023 .sv_shared_page_base = LINUX_SHAREDPAGE, 1024 .sv_shared_page_len = PAGE_SIZE, 1025 .sv_schedtail = linux_schedtail, 1026 .sv_thread_detach = linux_thread_detach, 1027 .sv_trap = NULL, 1028 }; 1029 1030 static void 1031 linux_vdso_install(void *param) 1032 { 1033 1034 linux_szsigcode = (&_binary_linux_locore_o_end - 1035 &_binary_linux_locore_o_start); 1036 1037 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 1038 panic("Linux invalid vdso size\n"); 1039 1040 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 1041 1042 linux_shared_page_obj = __elfN(linux_shared_page_init) 1043 (&linux_shared_page_mapping); 1044 1045 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 1046 1047 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1048 linux_szsigcode); 1049 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1050 } 1051 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1052 (sysinit_cfunc_t)linux_vdso_install, NULL); 1053 1054 static void 1055 linux_vdso_deinstall(void *param) 1056 { 1057 1058 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1059 }; 1060 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1061 (sysinit_cfunc_t)linux_vdso_deinstall, NULL); 1062 1063 static char GNU_ABI_VENDOR[] = "GNU"; 1064 static int GNULINUX_ABI_DESC = 0; 1065 1066 static boolean_t 1067 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1068 { 1069 const Elf32_Word *desc; 1070 uintptr_t p; 1071 1072 p = (uintptr_t)(note + 1); 1073 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1074 1075 desc = (const Elf32_Word *)p; 1076 if (desc[0] != GNULINUX_ABI_DESC) 1077 return (FALSE); 1078 1079 /* 1080 * For Linux we encode osrel as follows (see linux_mib.c): 1081 * VVVMMMIII (version, major, minor), see linux_mib.c. 1082 */ 1083 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1084 1085 return (TRUE); 1086 } 1087 1088 static Elf_Brandnote linux_brandnote = { 1089 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1090 .hdr.n_descsz = 16, /* XXX at least 16 */ 1091 .hdr.n_type = 1, 1092 .vendor = GNU_ABI_VENDOR, 1093 .flags = BN_TRANSLATE_OSREL, 1094 .trans_osrel = linux_trans_osrel 1095 }; 1096 1097 static Elf32_Brandinfo linux_brand = { 1098 .brand = ELFOSABI_LINUX, 1099 .machine = EM_386, 1100 .compat_3_brand = "Linux", 1101 .emul_path = "/compat/linux", 1102 .interp_path = "/lib/ld-linux.so.1", 1103 .sysvec = &elf_linux_sysvec, 1104 .interp_newpath = NULL, 1105 .brand_note = &linux_brandnote, 1106 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1107 }; 1108 1109 static Elf32_Brandinfo linux_glibc2brand = { 1110 .brand = ELFOSABI_LINUX, 1111 .machine = EM_386, 1112 .compat_3_brand = "Linux", 1113 .emul_path = "/compat/linux", 1114 .interp_path = "/lib/ld-linux.so.2", 1115 .sysvec = &elf_linux_sysvec, 1116 .interp_newpath = NULL, 1117 .brand_note = &linux_brandnote, 1118 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1119 }; 1120 1121 static Elf32_Brandinfo linux_muslbrand = { 1122 .brand = ELFOSABI_LINUX, 1123 .machine = EM_386, 1124 .compat_3_brand = "Linux", 1125 .emul_path = "/compat/linux", 1126 .interp_path = "/lib/ld-musl-i386.so.1", 1127 .sysvec = &elf_linux_sysvec, 1128 .interp_newpath = NULL, 1129 .brand_note = &linux_brandnote, 1130 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1131 }; 1132 1133 Elf32_Brandinfo *linux_brandlist[] = { 1134 &linux_brand, 1135 &linux_glibc2brand, 1136 &linux_muslbrand, 1137 NULL 1138 }; 1139 1140 static int 1141 linux_elf_modevent(module_t mod, int type, void *data) 1142 { 1143 Elf32_Brandinfo **brandinfo; 1144 int error; 1145 struct linux_ioctl_handler **lihp; 1146 1147 error = 0; 1148 1149 switch(type) { 1150 case MOD_LOAD: 1151 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1152 ++brandinfo) 1153 if (elf32_insert_brand_entry(*brandinfo) < 0) 1154 error = EINVAL; 1155 if (error == 0) { 1156 SET_FOREACH(lihp, linux_ioctl_handler_set) 1157 linux_ioctl_register_handler(*lihp); 1158 LIST_INIT(&futex_list); 1159 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1160 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1161 NULL, 1000); 1162 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1163 NULL, 1000); 1164 linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, 1165 linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); 1166 linux_get_machine(&linux_kplatform); 1167 linux_szplatform = roundup(strlen(linux_kplatform) + 1, 1168 sizeof(char *)); 1169 linux_osd_jail_register(); 1170 stclohz = (stathz ? stathz : hz); 1171 if (bootverbose) 1172 printf("Linux ELF exec handler installed\n"); 1173 } else 1174 printf("cannot insert Linux ELF brand handler\n"); 1175 break; 1176 case MOD_UNLOAD: 1177 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1178 ++brandinfo) 1179 if (elf32_brand_inuse(*brandinfo)) 1180 error = EBUSY; 1181 if (error == 0) { 1182 for (brandinfo = &linux_brandlist[0]; 1183 *brandinfo != NULL; ++brandinfo) 1184 if (elf32_remove_brand_entry(*brandinfo) < 0) 1185 error = EINVAL; 1186 } 1187 if (error == 0) { 1188 SET_FOREACH(lihp, linux_ioctl_handler_set) 1189 linux_ioctl_unregister_handler(*lihp); 1190 mtx_destroy(&futex_mtx); 1191 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1192 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1193 EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); 1194 linux_osd_jail_deregister(); 1195 if (bootverbose) 1196 printf("Linux ELF exec handler removed\n"); 1197 } else 1198 printf("Could not deinstall ELF interpreter entry\n"); 1199 break; 1200 default: 1201 return (EOPNOTSUPP); 1202 } 1203 return (error); 1204 } 1205 1206 static moduledata_t linux_elf_mod = { 1207 "linuxelf", 1208 linux_elf_modevent, 1209 0 1210 }; 1211 1212 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1213 FEATURE(linux, "Linux 32bit support"); 1214