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