1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2004 Tim J. Robbins 5 * Copyright (c) 2003 Peter Wemm 6 * Copyright (c) 2002 Doug Rabson 7 * Copyright (c) 1998-1999 Andrew Gallatin 8 * Copyright (c) 1994-1996 Søren Schmidt 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer 16 * in this position and unchanged. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef COMPAT_FREEBSD32 39 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 40 #endif 41 42 #define __ELF_WORD_SIZE 32 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/exec.h> 47 #include <sys/fcntl.h> 48 #include <sys/imgact.h> 49 #include <sys/imgact_elf.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/malloc.h> 53 #include <sys/module.h> 54 #include <sys/mutex.h> 55 #include <sys/proc.h> 56 #include <sys/resourcevar.h> 57 #include <sys/signalvar.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/sysent.h> 61 #include <sys/sysproto.h> 62 #include <sys/vnode.h> 63 #include <sys/eventhandler.h> 64 65 #include <vm/vm.h> 66 #include <vm/pmap.h> 67 #include <vm/vm_extern.h> 68 #include <vm/vm_map.h> 69 #include <vm/vm_object.h> 70 #include <vm/vm_page.h> 71 #include <vm/vm_param.h> 72 73 #include <machine/cpu.h> 74 #include <machine/md_var.h> 75 #include <machine/pcb.h> 76 #include <machine/specialreg.h> 77 #include <machine/trap.h> 78 79 #include <amd64/linux32/linux.h> 80 #include <amd64/linux32/linux32_proto.h> 81 #include <compat/linux/linux_emul.h> 82 #include <compat/linux/linux_futex.h> 83 #include <compat/linux/linux_ioctl.h> 84 #include <compat/linux/linux_mib.h> 85 #include <compat/linux/linux_misc.h> 86 #include <compat/linux/linux_signal.h> 87 #include <compat/linux/linux_util.h> 88 #include <compat/linux/linux_vdso.h> 89 90 MODULE_VERSION(linux, 1); 91 92 /* 93 * Allow the sendsig functions to use the ldebug() facility even though they 94 * are not syscalls themselves. Map them to syscall 0. This is slightly less 95 * bogus than using ldebug(sigreturn). 96 */ 97 #define LINUX32_SYS_linux_rt_sendsig 0 98 #define LINUX32_SYS_linux_sendsig 0 99 100 const char *linux_kplatform; 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_linux32_locore_o_start; 105 extern char _binary_linux32_locore_o_end; 106 107 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 108 109 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 110 111 static int linux_fixup_elf(register_t **stack_base, 112 struct image_params *iparams); 113 static register_t *linux_copyout_strings(struct image_params *imgp); 114 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 115 static void linux_exec_setregs(struct thread *td, 116 struct image_params *imgp, u_long stack); 117 static void linux32_fixlimit(struct rlimit *rl, int which); 118 static bool linux32_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 #define LINUX_T_UNKNOWN 255 123 static int _bsd_to_linux_trapcode[] = { 124 LINUX_T_UNKNOWN, /* 0 */ 125 6, /* 1 T_PRIVINFLT */ 126 LINUX_T_UNKNOWN, /* 2 */ 127 3, /* 3 T_BPTFLT */ 128 LINUX_T_UNKNOWN, /* 4 */ 129 LINUX_T_UNKNOWN, /* 5 */ 130 16, /* 6 T_ARITHTRAP */ 131 254, /* 7 T_ASTFLT */ 132 LINUX_T_UNKNOWN, /* 8 */ 133 13, /* 9 T_PROTFLT */ 134 1, /* 10 T_TRCTRAP */ 135 LINUX_T_UNKNOWN, /* 11 */ 136 14, /* 12 T_PAGEFLT */ 137 LINUX_T_UNKNOWN, /* 13 */ 138 17, /* 14 T_ALIGNFLT */ 139 LINUX_T_UNKNOWN, /* 15 */ 140 LINUX_T_UNKNOWN, /* 16 */ 141 LINUX_T_UNKNOWN, /* 17 */ 142 0, /* 18 T_DIVIDE */ 143 2, /* 19 T_NMI */ 144 4, /* 20 T_OFLOW */ 145 5, /* 21 T_BOUND */ 146 7, /* 22 T_DNA */ 147 8, /* 23 T_DOUBLEFLT */ 148 9, /* 24 T_FPOPFLT */ 149 10, /* 25 T_TSSFLT */ 150 11, /* 26 T_SEGNPFLT */ 151 12, /* 27 T_STKFLT */ 152 18, /* 28 T_MCHK */ 153 19, /* 29 T_XMMFLT */ 154 15 /* 30 T_RESERVED */ 155 }; 156 #define bsd_to_linux_trapcode(code) \ 157 ((code)<nitems(_bsd_to_linux_trapcode)? \ 158 _bsd_to_linux_trapcode[(code)]: \ 159 LINUX_T_UNKNOWN) 160 161 struct linux32_ps_strings { 162 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 163 u_int ps_nargvstr; /* the number of argument strings */ 164 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 165 u_int ps_nenvstr; /* the number of environment strings */ 166 }; 167 168 LINUX_VDSO_SYM_INTPTR(linux32_sigcode); 169 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode); 170 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall); 171 LINUX_VDSO_SYM_CHAR(linux_platform); 172 173 /* 174 * If FreeBSD & Linux have a difference of opinion about what a trap 175 * means, deal with it here. 176 * 177 * MPSAFE 178 */ 179 static int 180 linux_translate_traps(int signal, int trap_code) 181 { 182 if (signal != SIGBUS) 183 return (signal); 184 switch (trap_code) { 185 case T_PROTFLT: 186 case T_TSSFLT: 187 case T_DOUBLEFLT: 188 case T_PAGEFLT: 189 return (SIGSEGV); 190 default: 191 return (signal); 192 } 193 } 194 195 static int 196 linux_fixup_elf(register_t **stack_base, struct image_params *imgp) 197 { 198 Elf32_Auxargs *args; 199 Elf32_Auxinfo *argarray, *pos; 200 Elf32_Addr *auxbase, *base; 201 struct linux32_ps_strings *arginfo; 202 int error, issetugid; 203 204 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 205 206 KASSERT(curthread->td_proc == imgp->proc, 207 ("unsafe linux_fixup_elf(), should be curproc")); 208 base = (Elf32_Addr *)*stack_base; 209 args = (Elf32_Auxargs *)imgp->auxargs; 210 auxbase = base + (imgp->args->argc + 1 + imgp->args->envc + 1); 211 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 212 M_WAITOK | M_ZERO); 213 214 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 215 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 216 imgp->proc->p_sysent->sv_shared_page_base); 217 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux32_vsyscall); 218 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 219 220 /* 221 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 222 * as it has appeared in the 2.4.0-rc7 first time. 223 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 224 * glibc falls back to the hard-coded CLK_TCK value when aux entry 225 * is not present. 226 * Also see linux_times() implementation. 227 */ 228 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 229 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 230 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 231 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 232 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 233 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 234 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 235 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 236 AUXARGS_ENTRY(pos, AT_BASE, args->base); 237 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 238 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 239 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 240 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 241 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 242 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 243 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 244 if (imgp->execpathp != 0) 245 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 246 if (args->execfd != -1) 247 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 248 AUXARGS_ENTRY(pos, AT_NULL, 0); 249 250 free(imgp->auxargs, M_TEMP); 251 imgp->auxargs = NULL; 252 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 253 254 error = copyout(&argarray[0], auxbase, 255 sizeof(*argarray) * LINUX_AT_COUNT); 256 free(argarray, M_TEMP); 257 if (error != 0) 258 return (error); 259 260 base--; 261 if (suword32(base, (uint32_t)imgp->args->argc) == -1) 262 return (EFAULT); 263 *stack_base = (register_t *)base; 264 return (0); 265 } 266 267 static void 268 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 269 { 270 struct thread *td = curthread; 271 struct proc *p = td->td_proc; 272 struct sigacts *psp; 273 struct trapframe *regs; 274 struct l_rt_sigframe *fp, frame; 275 int oonstack; 276 int sig; 277 int code; 278 279 sig = ksi->ksi_signo; 280 code = ksi->ksi_code; 281 PROC_LOCK_ASSERT(p, MA_OWNED); 282 psp = p->p_sigacts; 283 mtx_assert(&psp->ps_mtx, MA_OWNED); 284 regs = td->td_frame; 285 oonstack = sigonstack(regs->tf_rsp); 286 287 #ifdef DEBUG 288 if (ldebug(rt_sendsig)) 289 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 290 catcher, sig, (void*)mask, code); 291 #endif 292 /* Allocate space for the signal handler context. */ 293 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 294 SIGISMEMBER(psp->ps_sigonstack, sig)) { 295 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 296 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 297 } else 298 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 299 mtx_unlock(&psp->ps_mtx); 300 301 /* Build the argument list for the signal handler. */ 302 sig = bsd_to_linux_signal(sig); 303 304 bzero(&frame, sizeof(frame)); 305 306 frame.sf_handler = PTROUT(catcher); 307 frame.sf_sig = sig; 308 frame.sf_siginfo = PTROUT(&fp->sf_si); 309 frame.sf_ucontext = PTROUT(&fp->sf_sc); 310 311 /* Fill in POSIX parts. */ 312 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 313 314 /* 315 * Build the signal context to be used by sigreturn and libgcc unwind. 316 */ 317 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 318 frame.sf_sc.uc_link = 0; /* XXX ??? */ 319 320 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 321 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 322 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 323 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 324 PROC_UNLOCK(p); 325 326 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 327 328 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 329 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 330 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 331 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 332 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 333 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 334 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 335 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 336 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 337 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 338 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 339 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 340 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 341 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 342 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 343 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 344 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 345 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 346 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 347 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 348 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 349 350 #ifdef DEBUG 351 if (ldebug(rt_sendsig)) 352 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 353 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 354 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 355 #endif 356 357 if (copyout(&frame, fp, sizeof(frame)) != 0) { 358 /* 359 * Process has trashed its stack; give it an illegal 360 * instruction to halt it in its tracks. 361 */ 362 #ifdef DEBUG 363 if (ldebug(rt_sendsig)) 364 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 365 fp, oonstack); 366 #endif 367 PROC_LOCK(p); 368 sigexit(td, SIGILL); 369 } 370 371 /* Build context to run handler in. */ 372 regs->tf_rsp = PTROUT(fp); 373 regs->tf_rip = linux32_rt_sigcode; 374 regs->tf_rflags &= ~(PSL_T | PSL_D); 375 regs->tf_cs = _ucode32sel; 376 regs->tf_ss = _udatasel; 377 regs->tf_ds = _udatasel; 378 regs->tf_es = _udatasel; 379 regs->tf_fs = _ufssel; 380 regs->tf_gs = _ugssel; 381 regs->tf_flags = TF_HASSEGS; 382 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 383 PROC_LOCK(p); 384 mtx_lock(&psp->ps_mtx); 385 } 386 387 388 /* 389 * Send an interrupt to process. 390 * 391 * Stack is set up to allow sigcode stored 392 * in u. to call routine, followed by kcall 393 * to sigreturn routine below. After sigreturn 394 * resets the signal mask, the stack, and the 395 * frame pointer, it returns to the user 396 * specified pc, psl. 397 */ 398 static void 399 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 400 { 401 struct thread *td = curthread; 402 struct proc *p = td->td_proc; 403 struct sigacts *psp; 404 struct trapframe *regs; 405 struct l_sigframe *fp, frame; 406 l_sigset_t lmask; 407 int oonstack; 408 int sig, code; 409 410 sig = ksi->ksi_signo; 411 code = ksi->ksi_code; 412 PROC_LOCK_ASSERT(p, MA_OWNED); 413 psp = p->p_sigacts; 414 mtx_assert(&psp->ps_mtx, MA_OWNED); 415 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 416 /* Signal handler installed with SA_SIGINFO. */ 417 linux_rt_sendsig(catcher, ksi, mask); 418 return; 419 } 420 421 regs = td->td_frame; 422 oonstack = sigonstack(regs->tf_rsp); 423 424 #ifdef DEBUG 425 if (ldebug(sendsig)) 426 printf(ARGS(sendsig, "%p, %d, %p, %u"), 427 catcher, sig, (void*)mask, code); 428 #endif 429 430 /* Allocate space for the signal handler context. */ 431 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 432 SIGISMEMBER(psp->ps_sigonstack, sig)) { 433 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 434 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 435 } else 436 fp = (struct l_sigframe *)regs->tf_rsp - 1; 437 mtx_unlock(&psp->ps_mtx); 438 PROC_UNLOCK(p); 439 440 /* Build the argument list for the signal handler. */ 441 sig = bsd_to_linux_signal(sig); 442 443 bzero(&frame, sizeof(frame)); 444 445 frame.sf_handler = PTROUT(catcher); 446 frame.sf_sig = sig; 447 448 bsd_to_linux_sigset(mask, &lmask); 449 450 /* Build the signal context to be used by sigreturn. */ 451 frame.sf_sc.sc_mask = lmask.__mask; 452 frame.sf_sc.sc_gs = regs->tf_gs; 453 frame.sf_sc.sc_fs = regs->tf_fs; 454 frame.sf_sc.sc_es = regs->tf_es; 455 frame.sf_sc.sc_ds = regs->tf_ds; 456 frame.sf_sc.sc_edi = regs->tf_rdi; 457 frame.sf_sc.sc_esi = regs->tf_rsi; 458 frame.sf_sc.sc_ebp = regs->tf_rbp; 459 frame.sf_sc.sc_ebx = regs->tf_rbx; 460 frame.sf_sc.sc_esp = regs->tf_rsp; 461 frame.sf_sc.sc_edx = regs->tf_rdx; 462 frame.sf_sc.sc_ecx = regs->tf_rcx; 463 frame.sf_sc.sc_eax = regs->tf_rax; 464 frame.sf_sc.sc_eip = regs->tf_rip; 465 frame.sf_sc.sc_cs = regs->tf_cs; 466 frame.sf_sc.sc_eflags = regs->tf_rflags; 467 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 468 frame.sf_sc.sc_ss = regs->tf_ss; 469 frame.sf_sc.sc_err = regs->tf_err; 470 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 471 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 472 473 frame.sf_extramask[0] = lmask.__mask; 474 475 if (copyout(&frame, fp, sizeof(frame)) != 0) { 476 /* 477 * Process has trashed its stack; give it an illegal 478 * instruction to halt it in its tracks. 479 */ 480 PROC_LOCK(p); 481 sigexit(td, SIGILL); 482 } 483 484 /* Build context to run handler in. */ 485 regs->tf_rsp = PTROUT(fp); 486 regs->tf_rip = linux32_sigcode; 487 regs->tf_rflags &= ~(PSL_T | PSL_D); 488 regs->tf_cs = _ucode32sel; 489 regs->tf_ss = _udatasel; 490 regs->tf_ds = _udatasel; 491 regs->tf_es = _udatasel; 492 regs->tf_fs = _ufssel; 493 regs->tf_gs = _ugssel; 494 regs->tf_flags = TF_HASSEGS; 495 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 496 PROC_LOCK(p); 497 mtx_lock(&psp->ps_mtx); 498 } 499 500 /* 501 * System call to cleanup state after a signal 502 * has been taken. Reset signal mask and 503 * stack state from context left by sendsig (above). 504 * Return to previous pc and psl as specified by 505 * context left by sendsig. Check carefully to 506 * make sure that the user has not modified the 507 * psl to gain improper privileges or to cause 508 * a machine fault. 509 */ 510 int 511 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 512 { 513 struct l_sigframe frame; 514 struct trapframe *regs; 515 sigset_t bmask; 516 l_sigset_t lmask; 517 int eflags; 518 ksiginfo_t ksi; 519 520 regs = td->td_frame; 521 522 #ifdef DEBUG 523 if (ldebug(sigreturn)) 524 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 525 #endif 526 /* 527 * The trampoline code hands us the sigframe. 528 * It is unsafe to keep track of it ourselves, in the event that a 529 * program jumps out of a signal handler. 530 */ 531 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 532 return (EFAULT); 533 534 /* Check for security violations. */ 535 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 536 eflags = frame.sf_sc.sc_eflags; 537 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 538 return(EINVAL); 539 540 /* 541 * Don't allow users to load a valid privileged %cs. Let the 542 * hardware check for invalid selectors, excess privilege in 543 * other selectors, invalid %eip's and invalid %esp's. 544 */ 545 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 546 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 547 ksiginfo_init_trap(&ksi); 548 ksi.ksi_signo = SIGBUS; 549 ksi.ksi_code = BUS_OBJERR; 550 ksi.ksi_trapno = T_PROTFLT; 551 ksi.ksi_addr = (void *)regs->tf_rip; 552 trapsignal(td, &ksi); 553 return(EINVAL); 554 } 555 556 lmask.__mask = frame.sf_sc.sc_mask; 557 lmask.__mask = frame.sf_extramask[0]; 558 linux_to_bsd_sigset(&lmask, &bmask); 559 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 560 561 /* Restore signal context. */ 562 regs->tf_rdi = frame.sf_sc.sc_edi; 563 regs->tf_rsi = frame.sf_sc.sc_esi; 564 regs->tf_rbp = frame.sf_sc.sc_ebp; 565 regs->tf_rbx = frame.sf_sc.sc_ebx; 566 regs->tf_rdx = frame.sf_sc.sc_edx; 567 regs->tf_rcx = frame.sf_sc.sc_ecx; 568 regs->tf_rax = frame.sf_sc.sc_eax; 569 regs->tf_rip = frame.sf_sc.sc_eip; 570 regs->tf_cs = frame.sf_sc.sc_cs; 571 regs->tf_ds = frame.sf_sc.sc_ds; 572 regs->tf_es = frame.sf_sc.sc_es; 573 regs->tf_fs = frame.sf_sc.sc_fs; 574 regs->tf_gs = frame.sf_sc.sc_gs; 575 regs->tf_rflags = eflags; 576 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 577 regs->tf_ss = frame.sf_sc.sc_ss; 578 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 579 580 return (EJUSTRETURN); 581 } 582 583 /* 584 * System call to cleanup state after a signal 585 * has been taken. Reset signal mask and 586 * stack state from context left by rt_sendsig (above). 587 * Return to previous pc and psl as specified by 588 * context left by sendsig. Check carefully to 589 * make sure that the user has not modified the 590 * psl to gain improper privileges or to cause 591 * a machine fault. 592 */ 593 int 594 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 595 { 596 struct l_ucontext uc; 597 struct l_sigcontext *context; 598 sigset_t bmask; 599 l_stack_t *lss; 600 stack_t ss; 601 struct trapframe *regs; 602 int eflags; 603 ksiginfo_t ksi; 604 605 regs = td->td_frame; 606 607 #ifdef DEBUG 608 if (ldebug(rt_sigreturn)) 609 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 610 #endif 611 /* 612 * The trampoline code hands us the ucontext. 613 * It is unsafe to keep track of it ourselves, in the event that a 614 * program jumps out of a signal handler. 615 */ 616 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 617 return (EFAULT); 618 619 context = &uc.uc_mcontext; 620 621 /* Check for security violations. */ 622 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 623 eflags = context->sc_eflags; 624 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 625 return(EINVAL); 626 627 /* 628 * Don't allow users to load a valid privileged %cs. Let the 629 * hardware check for invalid selectors, excess privilege in 630 * other selectors, invalid %eip's and invalid %esp's. 631 */ 632 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 633 if (!CS_SECURE(context->sc_cs)) { 634 ksiginfo_init_trap(&ksi); 635 ksi.ksi_signo = SIGBUS; 636 ksi.ksi_code = BUS_OBJERR; 637 ksi.ksi_trapno = T_PROTFLT; 638 ksi.ksi_addr = (void *)regs->tf_rip; 639 trapsignal(td, &ksi); 640 return(EINVAL); 641 } 642 643 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 644 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 645 646 /* 647 * Restore signal context 648 */ 649 regs->tf_gs = context->sc_gs; 650 regs->tf_fs = context->sc_fs; 651 regs->tf_es = context->sc_es; 652 regs->tf_ds = context->sc_ds; 653 regs->tf_rdi = context->sc_edi; 654 regs->tf_rsi = context->sc_esi; 655 regs->tf_rbp = context->sc_ebp; 656 regs->tf_rbx = context->sc_ebx; 657 regs->tf_rdx = context->sc_edx; 658 regs->tf_rcx = context->sc_ecx; 659 regs->tf_rax = context->sc_eax; 660 regs->tf_rip = context->sc_eip; 661 regs->tf_cs = context->sc_cs; 662 regs->tf_rflags = eflags; 663 regs->tf_rsp = context->sc_esp_at_signal; 664 regs->tf_ss = context->sc_ss; 665 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 666 667 /* 668 * call sigaltstack & ignore results.. 669 */ 670 lss = &uc.uc_stack; 671 ss.ss_sp = PTRIN(lss->ss_sp); 672 ss.ss_size = lss->ss_size; 673 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 674 675 #ifdef DEBUG 676 if (ldebug(rt_sigreturn)) 677 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 678 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 679 #endif 680 (void)kern_sigaltstack(td, &ss, NULL); 681 682 return (EJUSTRETURN); 683 } 684 685 static int 686 linux32_fetch_syscall_args(struct thread *td) 687 { 688 struct proc *p; 689 struct trapframe *frame; 690 struct syscall_args *sa; 691 692 p = td->td_proc; 693 frame = td->td_frame; 694 sa = &td->td_sa; 695 696 sa->args[0] = frame->tf_rbx; 697 sa->args[1] = frame->tf_rcx; 698 sa->args[2] = frame->tf_rdx; 699 sa->args[3] = frame->tf_rsi; 700 sa->args[4] = frame->tf_rdi; 701 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 702 sa->code = frame->tf_rax; 703 704 if (sa->code >= p->p_sysent->sv_size) 705 /* nosys */ 706 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 707 else 708 sa->callp = &p->p_sysent->sv_table[sa->code]; 709 sa->narg = sa->callp->sy_narg; 710 711 td->td_retval[0] = 0; 712 td->td_retval[1] = frame->tf_rdx; 713 714 return (0); 715 } 716 717 /* 718 * Clear registers on exec 719 * XXX copied from ia32_signal.c. 720 */ 721 static void 722 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 723 { 724 struct trapframe *regs = td->td_frame; 725 struct pcb *pcb = td->td_pcb; 726 register_t saved_rflags; 727 728 regs = td->td_frame; 729 pcb = td->td_pcb; 730 731 if (td->td_proc->p_md.md_ldt != NULL) 732 user_ldt_free(td); 733 734 critical_enter(); 735 wrmsr(MSR_FSBASE, 0); 736 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 737 pcb->pcb_fsbase = 0; 738 pcb->pcb_gsbase = 0; 739 critical_exit(); 740 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 741 742 saved_rflags = regs->tf_rflags & PSL_T; 743 bzero((char *)regs, sizeof(struct trapframe)); 744 regs->tf_rip = imgp->entry_addr; 745 regs->tf_rsp = stack; 746 regs->tf_rflags = PSL_USER | saved_rflags; 747 regs->tf_gs = _ugssel; 748 regs->tf_fs = _ufssel; 749 regs->tf_es = _udatasel; 750 regs->tf_ds = _udatasel; 751 regs->tf_ss = _udatasel; 752 regs->tf_flags = TF_HASSEGS; 753 regs->tf_cs = _ucode32sel; 754 regs->tf_rbx = imgp->ps_strings; 755 756 fpstate_drop(td); 757 758 /* Do full restore on return so that we can change to a different %cs */ 759 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 760 } 761 762 /* 763 * XXX copied from ia32_sysvec.c. 764 */ 765 static register_t * 766 linux_copyout_strings(struct image_params *imgp) 767 { 768 int argc, envc; 769 u_int32_t *vectp; 770 char *stringp, *destp; 771 u_int32_t *stack_base; 772 struct linux32_ps_strings *arginfo; 773 char canary[LINUX_AT_RANDOM_LEN]; 774 size_t execpath_len; 775 776 /* Calculate string base and vector table pointers. */ 777 if (imgp->execpath != NULL && imgp->auxargs != NULL) 778 execpath_len = strlen(imgp->execpath) + 1; 779 else 780 execpath_len = 0; 781 782 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 783 destp = (caddr_t)arginfo - SPARE_USRSPACE - 784 roundup(sizeof(canary), sizeof(char *)) - 785 roundup(execpath_len, sizeof(char *)) - 786 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 787 788 if (execpath_len != 0) { 789 imgp->execpathp = (uintptr_t)arginfo - execpath_len; 790 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 791 } 792 793 /* Prepare the canary for SSP. */ 794 arc4rand(canary, sizeof(canary), 0); 795 imgp->canary = (uintptr_t)arginfo - 796 roundup(execpath_len, sizeof(char *)) - 797 roundup(sizeof(canary), sizeof(char *)); 798 copyout(canary, (void *)imgp->canary, sizeof(canary)); 799 800 vectp = (uint32_t *)destp; 801 if (imgp->auxargs) { 802 /* 803 * Allocate room on the stack for the ELF auxargs 804 * array. It has LINUX_AT_COUNT entries. 805 */ 806 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo), 807 sizeof(*vectp)); 808 } 809 810 /* 811 * Allocate room for the argv[] and env vectors including the 812 * terminating NULL pointers. 813 */ 814 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 815 816 /* vectp also becomes our initial stack base. */ 817 stack_base = vectp; 818 819 stringp = imgp->args->begin_argv; 820 argc = imgp->args->argc; 821 envc = imgp->args->envc; 822 /* Copy out strings - arguments and environment. */ 823 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 824 825 /* Fill in "ps_strings" struct for ps, w, etc. */ 826 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 827 suword32(&arginfo->ps_nargvstr, argc); 828 829 /* Fill in argument portion of vector table. */ 830 for (; argc > 0; --argc) { 831 suword32(vectp++, (uint32_t)(intptr_t)destp); 832 while (*stringp++ != 0) 833 destp++; 834 destp++; 835 } 836 837 /* A null vector table pointer separates the argp's from the envp's. */ 838 suword32(vectp++, 0); 839 840 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 841 suword32(&arginfo->ps_nenvstr, envc); 842 843 /* Fill in environment portion of vector table. */ 844 for (; envc > 0; --envc) { 845 suword32(vectp++, (uint32_t)(intptr_t)destp); 846 while (*stringp++ != 0) 847 destp++; 848 destp++; 849 } 850 851 /* The end of the vector table is a null pointer. */ 852 suword32(vectp, 0); 853 854 return ((register_t *)stack_base); 855 } 856 857 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 858 "32-bit Linux emulation"); 859 860 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 861 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 862 &linux32_maxdsiz, 0, ""); 863 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 864 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 865 &linux32_maxssiz, 0, ""); 866 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 867 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 868 &linux32_maxvmem, 0, ""); 869 870 #if defined(DEBUG) 871 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 872 linux_sysctl_debug, "A", "Linux debugging control"); 873 #endif 874 875 static void 876 linux32_fixlimit(struct rlimit *rl, int which) 877 { 878 879 switch (which) { 880 case RLIMIT_DATA: 881 if (linux32_maxdsiz != 0) { 882 if (rl->rlim_cur > linux32_maxdsiz) 883 rl->rlim_cur = linux32_maxdsiz; 884 if (rl->rlim_max > linux32_maxdsiz) 885 rl->rlim_max = linux32_maxdsiz; 886 } 887 break; 888 case RLIMIT_STACK: 889 if (linux32_maxssiz != 0) { 890 if (rl->rlim_cur > linux32_maxssiz) 891 rl->rlim_cur = linux32_maxssiz; 892 if (rl->rlim_max > linux32_maxssiz) 893 rl->rlim_max = linux32_maxssiz; 894 } 895 break; 896 case RLIMIT_VMEM: 897 if (linux32_maxvmem != 0) { 898 if (rl->rlim_cur > linux32_maxvmem) 899 rl->rlim_cur = linux32_maxvmem; 900 if (rl->rlim_max > linux32_maxvmem) 901 rl->rlim_max = linux32_maxvmem; 902 } 903 break; 904 } 905 } 906 907 struct sysentvec elf_linux_sysvec = { 908 .sv_size = LINUX32_SYS_MAXSYSCALL, 909 .sv_table = linux32_sysent, 910 .sv_mask = 0, 911 .sv_errsize = ELAST + 1, 912 .sv_errtbl = linux_errtbl, 913 .sv_transtrap = linux_translate_traps, 914 .sv_fixup = linux_fixup_elf, 915 .sv_sendsig = linux_sendsig, 916 .sv_sigcode = &_binary_linux32_locore_o_start, 917 .sv_szsigcode = &linux_szsigcode, 918 .sv_name = "Linux ELF32", 919 .sv_coredump = elf32_coredump, 920 .sv_imgact_try = linux_exec_imgact_try, 921 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 922 .sv_pagesize = PAGE_SIZE, 923 .sv_minuser = VM_MIN_ADDRESS, 924 .sv_maxuser = LINUX32_MAXUSER, 925 .sv_usrstack = LINUX32_USRSTACK, 926 .sv_psstrings = LINUX32_PS_STRINGS, 927 .sv_stackprot = VM_PROT_ALL, 928 .sv_copyout_strings = linux_copyout_strings, 929 .sv_setregs = linux_exec_setregs, 930 .sv_fixlimit = linux32_fixlimit, 931 .sv_maxssiz = &linux32_maxssiz, 932 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP, 933 .sv_set_syscall_retval = cpu_set_syscall_retval, 934 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 935 .sv_syscallnames = NULL, 936 .sv_shared_page_base = LINUX32_SHAREDPAGE, 937 .sv_shared_page_len = PAGE_SIZE, 938 .sv_schedtail = linux_schedtail, 939 .sv_thread_detach = linux_thread_detach, 940 .sv_trap = NULL, 941 }; 942 943 static void 944 linux_vdso_install(void *param) 945 { 946 947 linux_szsigcode = (&_binary_linux32_locore_o_end - 948 &_binary_linux32_locore_o_start); 949 950 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 951 panic("Linux invalid vdso size\n"); 952 953 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 954 955 linux_shared_page_obj = __elfN(linux_shared_page_init) 956 (&linux_shared_page_mapping); 957 958 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 959 960 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 961 linux_szsigcode); 962 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 963 964 linux_kplatform = linux_shared_page_mapping + 965 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 966 } 967 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 968 linux_vdso_install, NULL); 969 970 static void 971 linux_vdso_deinstall(void *param) 972 { 973 974 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 975 } 976 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 977 linux_vdso_deinstall, NULL); 978 979 static char GNU_ABI_VENDOR[] = "GNU"; 980 static int GNULINUX_ABI_DESC = 0; 981 982 static bool 983 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 984 { 985 const Elf32_Word *desc; 986 uintptr_t p; 987 988 p = (uintptr_t)(note + 1); 989 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 990 991 desc = (const Elf32_Word *)p; 992 if (desc[0] != GNULINUX_ABI_DESC) 993 return (false); 994 995 /* 996 * For Linux we encode osrel using the Linux convention of 997 * (version << 16) | (major << 8) | (minor) 998 * See macro in linux_mib.h 999 */ 1000 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1001 1002 return (true); 1003 } 1004 1005 static Elf_Brandnote linux32_brandnote = { 1006 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1007 .hdr.n_descsz = 16, /* XXX at least 16 */ 1008 .hdr.n_type = 1, 1009 .vendor = GNU_ABI_VENDOR, 1010 .flags = BN_TRANSLATE_OSREL, 1011 .trans_osrel = linux32_trans_osrel 1012 }; 1013 1014 static Elf32_Brandinfo linux_brand = { 1015 .brand = ELFOSABI_LINUX, 1016 .machine = EM_386, 1017 .compat_3_brand = "Linux", 1018 .emul_path = "/compat/linux", 1019 .interp_path = "/lib/ld-linux.so.1", 1020 .sysvec = &elf_linux_sysvec, 1021 .interp_newpath = NULL, 1022 .brand_note = &linux32_brandnote, 1023 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1024 }; 1025 1026 static Elf32_Brandinfo linux_glibc2brand = { 1027 .brand = ELFOSABI_LINUX, 1028 .machine = EM_386, 1029 .compat_3_brand = "Linux", 1030 .emul_path = "/compat/linux", 1031 .interp_path = "/lib/ld-linux.so.2", 1032 .sysvec = &elf_linux_sysvec, 1033 .interp_newpath = NULL, 1034 .brand_note = &linux32_brandnote, 1035 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1036 }; 1037 1038 static Elf32_Brandinfo linux_muslbrand = { 1039 .brand = ELFOSABI_LINUX, 1040 .machine = EM_386, 1041 .compat_3_brand = "Linux", 1042 .emul_path = "/compat/linux", 1043 .interp_path = "/lib/ld-musl-i386.so.1", 1044 .sysvec = &elf_linux_sysvec, 1045 .interp_newpath = NULL, 1046 .brand_note = &linux32_brandnote, 1047 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1048 }; 1049 1050 Elf32_Brandinfo *linux_brandlist[] = { 1051 &linux_brand, 1052 &linux_glibc2brand, 1053 &linux_muslbrand, 1054 NULL 1055 }; 1056 1057 static int 1058 linux_elf_modevent(module_t mod, int type, void *data) 1059 { 1060 Elf32_Brandinfo **brandinfo; 1061 int error; 1062 struct linux_ioctl_handler **lihp; 1063 1064 error = 0; 1065 1066 switch(type) { 1067 case MOD_LOAD: 1068 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1069 ++brandinfo) 1070 if (elf32_insert_brand_entry(*brandinfo) < 0) 1071 error = EINVAL; 1072 if (error == 0) { 1073 SET_FOREACH(lihp, linux_ioctl_handler_set) 1074 linux_ioctl_register_handler(*lihp); 1075 LIST_INIT(&futex_list); 1076 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1077 stclohz = (stathz ? stathz : hz); 1078 if (bootverbose) 1079 printf("Linux ELF exec handler installed\n"); 1080 } else 1081 printf("cannot insert Linux ELF brand handler\n"); 1082 break; 1083 case MOD_UNLOAD: 1084 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1085 ++brandinfo) 1086 if (elf32_brand_inuse(*brandinfo)) 1087 error = EBUSY; 1088 if (error == 0) { 1089 for (brandinfo = &linux_brandlist[0]; 1090 *brandinfo != NULL; ++brandinfo) 1091 if (elf32_remove_brand_entry(*brandinfo) < 0) 1092 error = EINVAL; 1093 } 1094 if (error == 0) { 1095 SET_FOREACH(lihp, linux_ioctl_handler_set) 1096 linux_ioctl_unregister_handler(*lihp); 1097 mtx_destroy(&futex_mtx); 1098 if (bootverbose) 1099 printf("Linux ELF exec handler removed\n"); 1100 } else 1101 printf("Could not deinstall ELF interpreter entry\n"); 1102 break; 1103 default: 1104 return (EOPNOTSUPP); 1105 } 1106 return (error); 1107 } 1108 1109 static moduledata_t linux_elf_mod = { 1110 "linuxelf", 1111 linux_elf_modevent, 1112 0 1113 }; 1114 1115 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1116 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1117 FEATURE(linux, "Linux 32bit support"); 1118