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