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 "opt_compat.h" 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #ifndef COMPAT_FREEBSD32 41 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 42 #endif 43 44 #define __ELF_WORD_SIZE 32 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/exec.h> 49 #include <sys/fcntl.h> 50 #include <sys/imgact.h> 51 #include <sys/imgact_elf.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/module.h> 56 #include <sys/mutex.h> 57 #include <sys/proc.h> 58 #include <sys/resourcevar.h> 59 #include <sys/signalvar.h> 60 #include <sys/syscallsubr.h> 61 #include <sys/sysctl.h> 62 #include <sys/sysent.h> 63 #include <sys/sysproto.h> 64 #include <sys/vnode.h> 65 #include <sys/eventhandler.h> 66 67 #include <vm/vm.h> 68 #include <vm/pmap.h> 69 #include <vm/vm_extern.h> 70 #include <vm/vm_map.h> 71 #include <vm/vm_object.h> 72 #include <vm/vm_page.h> 73 #include <vm/vm_param.h> 74 75 #include <machine/cpu.h> 76 #include <machine/md_var.h> 77 #include <machine/pcb.h> 78 #include <machine/specialreg.h> 79 #include <machine/trap.h> 80 81 #include <amd64/linux32/linux.h> 82 #include <amd64/linux32/linux32_proto.h> 83 #include <compat/linux/linux_emul.h> 84 #include <compat/linux/linux_futex.h> 85 #include <compat/linux/linux_ioctl.h> 86 #include <compat/linux/linux_mib.h> 87 #include <compat/linux/linux_misc.h> 88 #include <compat/linux/linux_signal.h> 89 #include <compat/linux/linux_util.h> 90 #include <compat/linux/linux_vdso.h> 91 92 MODULE_VERSION(linux, 1); 93 94 /* 95 * Allow the sendsig functions to use the ldebug() facility even though they 96 * are not syscalls themselves. Map them to syscall 0. This is slightly less 97 * bogus than using ldebug(sigreturn). 98 */ 99 #define LINUX32_SYS_linux_rt_sendsig 0 100 #define LINUX32_SYS_linux_sendsig 0 101 102 const char *linux_kplatform; 103 static int linux_szsigcode; 104 static vm_object_t linux_shared_page_obj; 105 static char *linux_shared_page_mapping; 106 extern char _binary_linux32_locore_o_start; 107 extern char _binary_linux32_locore_o_end; 108 109 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 110 111 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 112 113 static int linux_fixup_elf(register_t **stack_base, 114 struct image_params *iparams); 115 static register_t *linux_copyout_strings(struct image_params *imgp); 116 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 117 static void linux_exec_setregs(struct thread *td, 118 struct image_params *imgp, u_long stack); 119 static void linux32_fixlimit(struct rlimit *rl, int which); 120 static bool linux32_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 #define LINUX_T_UNKNOWN 255 125 static int _bsd_to_linux_trapcode[] = { 126 LINUX_T_UNKNOWN, /* 0 */ 127 6, /* 1 T_PRIVINFLT */ 128 LINUX_T_UNKNOWN, /* 2 */ 129 3, /* 3 T_BPTFLT */ 130 LINUX_T_UNKNOWN, /* 4 */ 131 LINUX_T_UNKNOWN, /* 5 */ 132 16, /* 6 T_ARITHTRAP */ 133 254, /* 7 T_ASTFLT */ 134 LINUX_T_UNKNOWN, /* 8 */ 135 13, /* 9 T_PROTFLT */ 136 1, /* 10 T_TRCTRAP */ 137 LINUX_T_UNKNOWN, /* 11 */ 138 14, /* 12 T_PAGEFLT */ 139 LINUX_T_UNKNOWN, /* 13 */ 140 17, /* 14 T_ALIGNFLT */ 141 LINUX_T_UNKNOWN, /* 15 */ 142 LINUX_T_UNKNOWN, /* 16 */ 143 LINUX_T_UNKNOWN, /* 17 */ 144 0, /* 18 T_DIVIDE */ 145 2, /* 19 T_NMI */ 146 4, /* 20 T_OFLOW */ 147 5, /* 21 T_BOUND */ 148 7, /* 22 T_DNA */ 149 8, /* 23 T_DOUBLEFLT */ 150 9, /* 24 T_FPOPFLT */ 151 10, /* 25 T_TSSFLT */ 152 11, /* 26 T_SEGNPFLT */ 153 12, /* 27 T_STKFLT */ 154 18, /* 28 T_MCHK */ 155 19, /* 29 T_XMMFLT */ 156 15 /* 30 T_RESERVED */ 157 }; 158 #define bsd_to_linux_trapcode(code) \ 159 ((code)<nitems(_bsd_to_linux_trapcode)? \ 160 _bsd_to_linux_trapcode[(code)]: \ 161 LINUX_T_UNKNOWN) 162 163 struct linux32_ps_strings { 164 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 165 u_int ps_nargvstr; /* the number of argument strings */ 166 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 167 u_int ps_nenvstr; /* the number of environment strings */ 168 }; 169 170 LINUX_VDSO_SYM_INTPTR(linux32_sigcode); 171 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode); 172 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall); 173 LINUX_VDSO_SYM_CHAR(linux_platform); 174 175 /* 176 * If FreeBSD & Linux have a difference of opinion about what a trap 177 * means, deal with it here. 178 * 179 * MPSAFE 180 */ 181 static int 182 linux_translate_traps(int signal, int trap_code) 183 { 184 if (signal != SIGBUS) 185 return (signal); 186 switch (trap_code) { 187 case T_PROTFLT: 188 case T_TSSFLT: 189 case T_DOUBLEFLT: 190 case T_PAGEFLT: 191 return (SIGSEGV); 192 default: 193 return (signal); 194 } 195 } 196 197 static int 198 linux_fixup_elf(register_t **stack_base, struct image_params *imgp) 199 { 200 Elf32_Auxargs *args; 201 Elf32_Auxinfo *argarray, *pos; 202 Elf32_Addr *auxbase, *base; 203 struct linux32_ps_strings *arginfo; 204 int error, issetugid; 205 206 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 207 208 KASSERT(curthread->td_proc == imgp->proc, 209 ("unsafe linux_fixup_elf(), should be curproc")); 210 base = (Elf32_Addr *)*stack_base; 211 args = (Elf32_Auxargs *)imgp->auxargs; 212 auxbase = base + (imgp->args->argc + 1 + imgp->args->envc + 1); 213 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 214 M_WAITOK | M_ZERO); 215 216 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 217 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 218 imgp->proc->p_sysent->sv_shared_page_base); 219 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux32_vsyscall); 220 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 221 222 /* 223 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 224 * as it has appeared in the 2.4.0-rc7 first time. 225 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 226 * glibc falls back to the hard-coded CLK_TCK value when aux entry 227 * is not present. 228 * Also see linux_times() implementation. 229 */ 230 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 231 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 232 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 233 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 234 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 235 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 236 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 237 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 238 AUXARGS_ENTRY(pos, AT_BASE, args->base); 239 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 240 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 241 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 242 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 243 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 244 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 245 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 246 if (imgp->execpathp != 0) 247 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 248 if (args->execfd != -1) 249 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 250 AUXARGS_ENTRY(pos, AT_NULL, 0); 251 252 free(imgp->auxargs, M_TEMP); 253 imgp->auxargs = NULL; 254 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 255 256 error = copyout(&argarray[0], auxbase, 257 sizeof(*argarray) * LINUX_AT_COUNT); 258 free(argarray, M_TEMP); 259 if (error != 0) 260 return (error); 261 262 base--; 263 if (suword32(base, (uint32_t)imgp->args->argc) == -1) 264 return (EFAULT); 265 *stack_base = (register_t *)base; 266 return (0); 267 } 268 269 static void 270 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 271 { 272 struct thread *td = curthread; 273 struct proc *p = td->td_proc; 274 struct sigacts *psp; 275 struct trapframe *regs; 276 struct l_rt_sigframe *fp, frame; 277 int oonstack; 278 int sig; 279 int code; 280 281 sig = ksi->ksi_signo; 282 code = ksi->ksi_code; 283 PROC_LOCK_ASSERT(p, MA_OWNED); 284 psp = p->p_sigacts; 285 mtx_assert(&psp->ps_mtx, MA_OWNED); 286 regs = td->td_frame; 287 oonstack = sigonstack(regs->tf_rsp); 288 289 #ifdef DEBUG 290 if (ldebug(rt_sendsig)) 291 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 292 catcher, sig, (void*)mask, code); 293 #endif 294 /* Allocate space for the signal handler context. */ 295 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 296 SIGISMEMBER(psp->ps_sigonstack, sig)) { 297 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 298 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 299 } else 300 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 301 mtx_unlock(&psp->ps_mtx); 302 303 /* Build the argument list for the signal handler. */ 304 sig = bsd_to_linux_signal(sig); 305 306 bzero(&frame, sizeof(frame)); 307 308 frame.sf_handler = PTROUT(catcher); 309 frame.sf_sig = sig; 310 frame.sf_siginfo = PTROUT(&fp->sf_si); 311 frame.sf_ucontext = PTROUT(&fp->sf_sc); 312 313 /* Fill in POSIX parts. */ 314 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 315 316 /* 317 * Build the signal context to be used by sigreturn and libgcc unwind. 318 */ 319 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 320 frame.sf_sc.uc_link = 0; /* XXX ??? */ 321 322 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 323 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 324 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 325 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 326 PROC_UNLOCK(p); 327 328 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 329 330 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 331 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 332 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 333 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 334 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 335 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 336 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 337 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 338 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 339 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 340 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 341 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 342 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 343 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 344 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 345 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 346 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 347 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 348 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 349 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 350 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 351 352 #ifdef DEBUG 353 if (ldebug(rt_sendsig)) 354 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 355 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 356 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 357 #endif 358 359 if (copyout(&frame, fp, sizeof(frame)) != 0) { 360 /* 361 * Process has trashed its stack; give it an illegal 362 * instruction to halt it in its tracks. 363 */ 364 #ifdef DEBUG 365 if (ldebug(rt_sendsig)) 366 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 367 fp, oonstack); 368 #endif 369 PROC_LOCK(p); 370 sigexit(td, SIGILL); 371 } 372 373 /* Build context to run handler in. */ 374 regs->tf_rsp = PTROUT(fp); 375 regs->tf_rip = linux32_rt_sigcode; 376 regs->tf_rflags &= ~(PSL_T | PSL_D); 377 regs->tf_cs = _ucode32sel; 378 regs->tf_ss = _udatasel; 379 regs->tf_ds = _udatasel; 380 regs->tf_es = _udatasel; 381 regs->tf_fs = _ufssel; 382 regs->tf_gs = _ugssel; 383 regs->tf_flags = TF_HASSEGS; 384 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 385 PROC_LOCK(p); 386 mtx_lock(&psp->ps_mtx); 387 } 388 389 390 /* 391 * Send an interrupt to process. 392 * 393 * Stack is set up to allow sigcode stored 394 * in u. to call routine, followed by kcall 395 * to sigreturn routine below. After sigreturn 396 * resets the signal mask, the stack, and the 397 * frame pointer, it returns to the user 398 * specified pc, psl. 399 */ 400 static void 401 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 402 { 403 struct thread *td = curthread; 404 struct proc *p = td->td_proc; 405 struct sigacts *psp; 406 struct trapframe *regs; 407 struct l_sigframe *fp, frame; 408 l_sigset_t lmask; 409 int oonstack; 410 int sig, code; 411 412 sig = ksi->ksi_signo; 413 code = ksi->ksi_code; 414 PROC_LOCK_ASSERT(p, MA_OWNED); 415 psp = p->p_sigacts; 416 mtx_assert(&psp->ps_mtx, MA_OWNED); 417 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 418 /* Signal handler installed with SA_SIGINFO. */ 419 linux_rt_sendsig(catcher, ksi, mask); 420 return; 421 } 422 423 regs = td->td_frame; 424 oonstack = sigonstack(regs->tf_rsp); 425 426 #ifdef DEBUG 427 if (ldebug(sendsig)) 428 printf(ARGS(sendsig, "%p, %d, %p, %u"), 429 catcher, sig, (void*)mask, code); 430 #endif 431 432 /* Allocate space for the signal handler context. */ 433 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 434 SIGISMEMBER(psp->ps_sigonstack, sig)) { 435 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 436 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 437 } else 438 fp = (struct l_sigframe *)regs->tf_rsp - 1; 439 mtx_unlock(&psp->ps_mtx); 440 PROC_UNLOCK(p); 441 442 /* Build the argument list for the signal handler. */ 443 sig = bsd_to_linux_signal(sig); 444 445 bzero(&frame, sizeof(frame)); 446 447 frame.sf_handler = PTROUT(catcher); 448 frame.sf_sig = sig; 449 450 bsd_to_linux_sigset(mask, &lmask); 451 452 /* Build the signal context to be used by sigreturn. */ 453 frame.sf_sc.sc_mask = lmask.__mask; 454 frame.sf_sc.sc_gs = regs->tf_gs; 455 frame.sf_sc.sc_fs = regs->tf_fs; 456 frame.sf_sc.sc_es = regs->tf_es; 457 frame.sf_sc.sc_ds = regs->tf_ds; 458 frame.sf_sc.sc_edi = regs->tf_rdi; 459 frame.sf_sc.sc_esi = regs->tf_rsi; 460 frame.sf_sc.sc_ebp = regs->tf_rbp; 461 frame.sf_sc.sc_ebx = regs->tf_rbx; 462 frame.sf_sc.sc_esp = regs->tf_rsp; 463 frame.sf_sc.sc_edx = regs->tf_rdx; 464 frame.sf_sc.sc_ecx = regs->tf_rcx; 465 frame.sf_sc.sc_eax = regs->tf_rax; 466 frame.sf_sc.sc_eip = regs->tf_rip; 467 frame.sf_sc.sc_cs = regs->tf_cs; 468 frame.sf_sc.sc_eflags = regs->tf_rflags; 469 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 470 frame.sf_sc.sc_ss = regs->tf_ss; 471 frame.sf_sc.sc_err = regs->tf_err; 472 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 473 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 474 475 frame.sf_extramask[0] = lmask.__mask; 476 477 if (copyout(&frame, fp, sizeof(frame)) != 0) { 478 /* 479 * Process has trashed its stack; give it an illegal 480 * instruction to halt it in its tracks. 481 */ 482 PROC_LOCK(p); 483 sigexit(td, SIGILL); 484 } 485 486 /* Build context to run handler in. */ 487 regs->tf_rsp = PTROUT(fp); 488 regs->tf_rip = linux32_sigcode; 489 regs->tf_rflags &= ~(PSL_T | PSL_D); 490 regs->tf_cs = _ucode32sel; 491 regs->tf_ss = _udatasel; 492 regs->tf_ds = _udatasel; 493 regs->tf_es = _udatasel; 494 regs->tf_fs = _ufssel; 495 regs->tf_gs = _ugssel; 496 regs->tf_flags = TF_HASSEGS; 497 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 498 PROC_LOCK(p); 499 mtx_lock(&psp->ps_mtx); 500 } 501 502 /* 503 * System call to cleanup state after a signal 504 * has been taken. Reset signal mask and 505 * stack state from context left by sendsig (above). 506 * Return to previous pc and psl as specified by 507 * context left by sendsig. Check carefully to 508 * make sure that the user has not modified the 509 * psl to gain improper privileges or to cause 510 * a machine fault. 511 */ 512 int 513 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 514 { 515 struct l_sigframe frame; 516 struct trapframe *regs; 517 sigset_t bmask; 518 l_sigset_t lmask; 519 int eflags; 520 ksiginfo_t ksi; 521 522 regs = td->td_frame; 523 524 #ifdef DEBUG 525 if (ldebug(sigreturn)) 526 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 527 #endif 528 /* 529 * The trampoline code hands us the sigframe. 530 * It is unsafe to keep track of it ourselves, in the event that a 531 * program jumps out of a signal handler. 532 */ 533 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 534 return (EFAULT); 535 536 /* Check for security violations. */ 537 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 538 eflags = frame.sf_sc.sc_eflags; 539 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 540 return(EINVAL); 541 542 /* 543 * Don't allow users to load a valid privileged %cs. Let the 544 * hardware check for invalid selectors, excess privilege in 545 * other selectors, invalid %eip's and invalid %esp's. 546 */ 547 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 548 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 549 ksiginfo_init_trap(&ksi); 550 ksi.ksi_signo = SIGBUS; 551 ksi.ksi_code = BUS_OBJERR; 552 ksi.ksi_trapno = T_PROTFLT; 553 ksi.ksi_addr = (void *)regs->tf_rip; 554 trapsignal(td, &ksi); 555 return(EINVAL); 556 } 557 558 lmask.__mask = frame.sf_sc.sc_mask; 559 lmask.__mask = frame.sf_extramask[0]; 560 linux_to_bsd_sigset(&lmask, &bmask); 561 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 562 563 /* Restore signal context. */ 564 regs->tf_rdi = frame.sf_sc.sc_edi; 565 regs->tf_rsi = frame.sf_sc.sc_esi; 566 regs->tf_rbp = frame.sf_sc.sc_ebp; 567 regs->tf_rbx = frame.sf_sc.sc_ebx; 568 regs->tf_rdx = frame.sf_sc.sc_edx; 569 regs->tf_rcx = frame.sf_sc.sc_ecx; 570 regs->tf_rax = frame.sf_sc.sc_eax; 571 regs->tf_rip = frame.sf_sc.sc_eip; 572 regs->tf_cs = frame.sf_sc.sc_cs; 573 regs->tf_ds = frame.sf_sc.sc_ds; 574 regs->tf_es = frame.sf_sc.sc_es; 575 regs->tf_fs = frame.sf_sc.sc_fs; 576 regs->tf_gs = frame.sf_sc.sc_gs; 577 regs->tf_rflags = eflags; 578 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 579 regs->tf_ss = frame.sf_sc.sc_ss; 580 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 581 582 return (EJUSTRETURN); 583 } 584 585 /* 586 * System call to cleanup state after a signal 587 * has been taken. Reset signal mask and 588 * stack state from context left by rt_sendsig (above). 589 * Return to previous pc and psl as specified by 590 * context left by sendsig. Check carefully to 591 * make sure that the user has not modified the 592 * psl to gain improper privileges or to cause 593 * a machine fault. 594 */ 595 int 596 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 597 { 598 struct l_ucontext uc; 599 struct l_sigcontext *context; 600 sigset_t bmask; 601 l_stack_t *lss; 602 stack_t ss; 603 struct trapframe *regs; 604 int eflags; 605 ksiginfo_t ksi; 606 607 regs = td->td_frame; 608 609 #ifdef DEBUG 610 if (ldebug(rt_sigreturn)) 611 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 612 #endif 613 /* 614 * The trampoline code hands us the ucontext. 615 * It is unsafe to keep track of it ourselves, in the event that a 616 * program jumps out of a signal handler. 617 */ 618 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 619 return (EFAULT); 620 621 context = &uc.uc_mcontext; 622 623 /* Check for security violations. */ 624 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 625 eflags = context->sc_eflags; 626 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 627 return(EINVAL); 628 629 /* 630 * Don't allow users to load a valid privileged %cs. Let the 631 * hardware check for invalid selectors, excess privilege in 632 * other selectors, invalid %eip's and invalid %esp's. 633 */ 634 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 635 if (!CS_SECURE(context->sc_cs)) { 636 ksiginfo_init_trap(&ksi); 637 ksi.ksi_signo = SIGBUS; 638 ksi.ksi_code = BUS_OBJERR; 639 ksi.ksi_trapno = T_PROTFLT; 640 ksi.ksi_addr = (void *)regs->tf_rip; 641 trapsignal(td, &ksi); 642 return(EINVAL); 643 } 644 645 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 646 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 647 648 /* 649 * Restore signal context 650 */ 651 regs->tf_gs = context->sc_gs; 652 regs->tf_fs = context->sc_fs; 653 regs->tf_es = context->sc_es; 654 regs->tf_ds = context->sc_ds; 655 regs->tf_rdi = context->sc_edi; 656 regs->tf_rsi = context->sc_esi; 657 regs->tf_rbp = context->sc_ebp; 658 regs->tf_rbx = context->sc_ebx; 659 regs->tf_rdx = context->sc_edx; 660 regs->tf_rcx = context->sc_ecx; 661 regs->tf_rax = context->sc_eax; 662 regs->tf_rip = context->sc_eip; 663 regs->tf_cs = context->sc_cs; 664 regs->tf_rflags = eflags; 665 regs->tf_rsp = context->sc_esp_at_signal; 666 regs->tf_ss = context->sc_ss; 667 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 668 669 /* 670 * call sigaltstack & ignore results.. 671 */ 672 lss = &uc.uc_stack; 673 ss.ss_sp = PTRIN(lss->ss_sp); 674 ss.ss_size = lss->ss_size; 675 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 676 677 #ifdef DEBUG 678 if (ldebug(rt_sigreturn)) 679 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 680 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 681 #endif 682 (void)kern_sigaltstack(td, &ss, NULL); 683 684 return (EJUSTRETURN); 685 } 686 687 static int 688 linux32_fetch_syscall_args(struct thread *td) 689 { 690 struct proc *p; 691 struct trapframe *frame; 692 struct syscall_args *sa; 693 694 p = td->td_proc; 695 frame = td->td_frame; 696 sa = &td->td_sa; 697 698 sa->args[0] = frame->tf_rbx; 699 sa->args[1] = frame->tf_rcx; 700 sa->args[2] = frame->tf_rdx; 701 sa->args[3] = frame->tf_rsi; 702 sa->args[4] = frame->tf_rdi; 703 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 704 sa->code = frame->tf_rax; 705 706 if (sa->code >= p->p_sysent->sv_size) 707 /* nosys */ 708 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 709 else 710 sa->callp = &p->p_sysent->sv_table[sa->code]; 711 sa->narg = sa->callp->sy_narg; 712 713 td->td_retval[0] = 0; 714 td->td_retval[1] = frame->tf_rdx; 715 716 return (0); 717 } 718 719 /* 720 * Clear registers on exec 721 * XXX copied from ia32_signal.c. 722 */ 723 static void 724 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 725 { 726 struct trapframe *regs = td->td_frame; 727 struct pcb *pcb = td->td_pcb; 728 register_t saved_rflags; 729 730 regs = td->td_frame; 731 pcb = td->td_pcb; 732 733 if (td->td_proc->p_md.md_ldt != NULL) 734 user_ldt_free(td); 735 736 critical_enter(); 737 wrmsr(MSR_FSBASE, 0); 738 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 739 pcb->pcb_fsbase = 0; 740 pcb->pcb_gsbase = 0; 741 critical_exit(); 742 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 743 744 saved_rflags = regs->tf_rflags & PSL_T; 745 bzero((char *)regs, sizeof(struct trapframe)); 746 regs->tf_rip = imgp->entry_addr; 747 regs->tf_rsp = stack; 748 regs->tf_rflags = PSL_USER | saved_rflags; 749 regs->tf_gs = _ugssel; 750 regs->tf_fs = _ufssel; 751 regs->tf_es = _udatasel; 752 regs->tf_ds = _udatasel; 753 regs->tf_ss = _udatasel; 754 regs->tf_flags = TF_HASSEGS; 755 regs->tf_cs = _ucode32sel; 756 regs->tf_rbx = imgp->ps_strings; 757 758 fpstate_drop(td); 759 760 /* Do full restore on return so that we can change to a different %cs */ 761 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 762 } 763 764 /* 765 * XXX copied from ia32_sysvec.c. 766 */ 767 static register_t * 768 linux_copyout_strings(struct image_params *imgp) 769 { 770 int argc, envc; 771 u_int32_t *vectp; 772 char *stringp, *destp; 773 u_int32_t *stack_base; 774 struct linux32_ps_strings *arginfo; 775 char canary[LINUX_AT_RANDOM_LEN]; 776 size_t execpath_len; 777 778 /* Calculate string base and vector table pointers. */ 779 if (imgp->execpath != NULL && imgp->auxargs != NULL) 780 execpath_len = strlen(imgp->execpath) + 1; 781 else 782 execpath_len = 0; 783 784 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 785 destp = (caddr_t)arginfo - SPARE_USRSPACE - 786 roundup(sizeof(canary), sizeof(char *)) - 787 roundup(execpath_len, sizeof(char *)) - 788 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 789 790 if (execpath_len != 0) { 791 imgp->execpathp = (uintptr_t)arginfo - execpath_len; 792 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 793 } 794 795 /* Prepare the canary for SSP. */ 796 arc4rand(canary, sizeof(canary), 0); 797 imgp->canary = (uintptr_t)arginfo - 798 roundup(execpath_len, sizeof(char *)) - 799 roundup(sizeof(canary), sizeof(char *)); 800 copyout(canary, (void *)imgp->canary, sizeof(canary)); 801 802 vectp = (uint32_t *)destp; 803 if (imgp->auxargs) { 804 /* 805 * Allocate room on the stack for the ELF auxargs 806 * array. It has LINUX_AT_COUNT entries. 807 */ 808 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo), 809 sizeof(*vectp)); 810 } 811 812 /* 813 * Allocate room for the argv[] and env vectors including the 814 * terminating NULL pointers. 815 */ 816 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 817 818 /* vectp also becomes our initial stack base. */ 819 stack_base = vectp; 820 821 stringp = imgp->args->begin_argv; 822 argc = imgp->args->argc; 823 envc = imgp->args->envc; 824 /* Copy out strings - arguments and environment. */ 825 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 826 827 /* Fill in "ps_strings" struct for ps, w, etc. */ 828 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 829 suword32(&arginfo->ps_nargvstr, argc); 830 831 /* Fill in argument portion of vector table. */ 832 for (; argc > 0; --argc) { 833 suword32(vectp++, (uint32_t)(intptr_t)destp); 834 while (*stringp++ != 0) 835 destp++; 836 destp++; 837 } 838 839 /* A null vector table pointer separates the argp's from the envp's. */ 840 suword32(vectp++, 0); 841 842 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 843 suword32(&arginfo->ps_nenvstr, envc); 844 845 /* Fill in environment portion of vector table. */ 846 for (; envc > 0; --envc) { 847 suword32(vectp++, (uint32_t)(intptr_t)destp); 848 while (*stringp++ != 0) 849 destp++; 850 destp++; 851 } 852 853 /* The end of the vector table is a null pointer. */ 854 suword32(vectp, 0); 855 856 return ((register_t *)stack_base); 857 } 858 859 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 860 "32-bit Linux emulation"); 861 862 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 863 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 864 &linux32_maxdsiz, 0, ""); 865 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 866 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 867 &linux32_maxssiz, 0, ""); 868 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 869 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 870 &linux32_maxvmem, 0, ""); 871 872 #if defined(DEBUG) 873 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 874 linux_sysctl_debug, "A", "Linux debugging control"); 875 #endif 876 877 static void 878 linux32_fixlimit(struct rlimit *rl, int which) 879 { 880 881 switch (which) { 882 case RLIMIT_DATA: 883 if (linux32_maxdsiz != 0) { 884 if (rl->rlim_cur > linux32_maxdsiz) 885 rl->rlim_cur = linux32_maxdsiz; 886 if (rl->rlim_max > linux32_maxdsiz) 887 rl->rlim_max = linux32_maxdsiz; 888 } 889 break; 890 case RLIMIT_STACK: 891 if (linux32_maxssiz != 0) { 892 if (rl->rlim_cur > linux32_maxssiz) 893 rl->rlim_cur = linux32_maxssiz; 894 if (rl->rlim_max > linux32_maxssiz) 895 rl->rlim_max = linux32_maxssiz; 896 } 897 break; 898 case RLIMIT_VMEM: 899 if (linux32_maxvmem != 0) { 900 if (rl->rlim_cur > linux32_maxvmem) 901 rl->rlim_cur = linux32_maxvmem; 902 if (rl->rlim_max > linux32_maxvmem) 903 rl->rlim_max = linux32_maxvmem; 904 } 905 break; 906 } 907 } 908 909 struct sysentvec elf_linux_sysvec = { 910 .sv_size = LINUX32_SYS_MAXSYSCALL, 911 .sv_table = linux32_sysent, 912 .sv_errsize = ELAST + 1, 913 .sv_errtbl = linux_errtbl, 914 .sv_transtrap = linux_translate_traps, 915 .sv_fixup = linux_fixup_elf, 916 .sv_sendsig = linux_sendsig, 917 .sv_sigcode = &_binary_linux32_locore_o_start, 918 .sv_szsigcode = &linux_szsigcode, 919 .sv_name = "Linux ELF32", 920 .sv_coredump = elf32_coredump, 921 .sv_imgact_try = linux_exec_imgact_try, 922 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 923 .sv_pagesize = PAGE_SIZE, 924 .sv_minuser = VM_MIN_ADDRESS, 925 .sv_maxuser = LINUX32_MAXUSER, 926 .sv_usrstack = LINUX32_USRSTACK, 927 .sv_psstrings = LINUX32_PS_STRINGS, 928 .sv_stackprot = VM_PROT_ALL, 929 .sv_copyout_strings = linux_copyout_strings, 930 .sv_setregs = linux_exec_setregs, 931 .sv_fixlimit = linux32_fixlimit, 932 .sv_maxssiz = &linux32_maxssiz, 933 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP, 934 .sv_set_syscall_retval = cpu_set_syscall_retval, 935 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 936 .sv_syscallnames = NULL, 937 .sv_shared_page_base = LINUX32_SHAREDPAGE, 938 .sv_shared_page_len = PAGE_SIZE, 939 .sv_schedtail = linux_schedtail, 940 .sv_thread_detach = linux_thread_detach, 941 .sv_trap = NULL, 942 }; 943 944 static void 945 linux_vdso_install(void *param) 946 { 947 948 linux_szsigcode = (&_binary_linux32_locore_o_end - 949 &_binary_linux32_locore_o_start); 950 951 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 952 panic("Linux invalid vdso size\n"); 953 954 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 955 956 linux_shared_page_obj = __elfN(linux_shared_page_init) 957 (&linux_shared_page_mapping); 958 959 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 960 961 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 962 linux_szsigcode); 963 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 964 965 linux_kplatform = linux_shared_page_mapping + 966 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 967 } 968 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 969 linux_vdso_install, NULL); 970 971 static void 972 linux_vdso_deinstall(void *param) 973 { 974 975 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 976 } 977 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 978 linux_vdso_deinstall, NULL); 979 980 static char GNU_ABI_VENDOR[] = "GNU"; 981 static int GNULINUX_ABI_DESC = 0; 982 983 static bool 984 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 985 { 986 const Elf32_Word *desc; 987 uintptr_t p; 988 989 p = (uintptr_t)(note + 1); 990 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 991 992 desc = (const Elf32_Word *)p; 993 if (desc[0] != GNULINUX_ABI_DESC) 994 return (false); 995 996 /* 997 * For Linux we encode osrel using the Linux convention of 998 * (version << 16) | (major << 8) | (minor) 999 * See macro in linux_mib.h 1000 */ 1001 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1002 1003 return (true); 1004 } 1005 1006 static Elf_Brandnote linux32_brandnote = { 1007 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1008 .hdr.n_descsz = 16, /* XXX at least 16 */ 1009 .hdr.n_type = 1, 1010 .vendor = GNU_ABI_VENDOR, 1011 .flags = BN_TRANSLATE_OSREL, 1012 .trans_osrel = linux32_trans_osrel 1013 }; 1014 1015 static Elf32_Brandinfo linux_brand = { 1016 .brand = ELFOSABI_LINUX, 1017 .machine = EM_386, 1018 .compat_3_brand = "Linux", 1019 .emul_path = "/compat/linux", 1020 .interp_path = "/lib/ld-linux.so.1", 1021 .sysvec = &elf_linux_sysvec, 1022 .interp_newpath = NULL, 1023 .brand_note = &linux32_brandnote, 1024 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1025 }; 1026 1027 static Elf32_Brandinfo linux_glibc2brand = { 1028 .brand = ELFOSABI_LINUX, 1029 .machine = EM_386, 1030 .compat_3_brand = "Linux", 1031 .emul_path = "/compat/linux", 1032 .interp_path = "/lib/ld-linux.so.2", 1033 .sysvec = &elf_linux_sysvec, 1034 .interp_newpath = NULL, 1035 .brand_note = &linux32_brandnote, 1036 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1037 }; 1038 1039 static Elf32_Brandinfo linux_muslbrand = { 1040 .brand = ELFOSABI_LINUX, 1041 .machine = EM_386, 1042 .compat_3_brand = "Linux", 1043 .emul_path = "/compat/linux", 1044 .interp_path = "/lib/ld-musl-i386.so.1", 1045 .sysvec = &elf_linux_sysvec, 1046 .interp_newpath = NULL, 1047 .brand_note = &linux32_brandnote, 1048 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1049 }; 1050 1051 Elf32_Brandinfo *linux_brandlist[] = { 1052 &linux_brand, 1053 &linux_glibc2brand, 1054 &linux_muslbrand, 1055 NULL 1056 }; 1057 1058 static int 1059 linux_elf_modevent(module_t mod, int type, void *data) 1060 { 1061 Elf32_Brandinfo **brandinfo; 1062 int error; 1063 struct linux_ioctl_handler **lihp; 1064 1065 error = 0; 1066 1067 switch(type) { 1068 case MOD_LOAD: 1069 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1070 ++brandinfo) 1071 if (elf32_insert_brand_entry(*brandinfo) < 0) 1072 error = EINVAL; 1073 if (error == 0) { 1074 SET_FOREACH(lihp, linux_ioctl_handler_set) 1075 linux32_ioctl_register_handler(*lihp); 1076 LIST_INIT(&futex_list); 1077 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1078 stclohz = (stathz ? stathz : hz); 1079 if (bootverbose) 1080 printf("Linux ELF exec handler installed\n"); 1081 } else 1082 printf("cannot insert Linux ELF brand handler\n"); 1083 break; 1084 case MOD_UNLOAD: 1085 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1086 ++brandinfo) 1087 if (elf32_brand_inuse(*brandinfo)) 1088 error = EBUSY; 1089 if (error == 0) { 1090 for (brandinfo = &linux_brandlist[0]; 1091 *brandinfo != NULL; ++brandinfo) 1092 if (elf32_remove_brand_entry(*brandinfo) < 0) 1093 error = EINVAL; 1094 } 1095 if (error == 0) { 1096 SET_FOREACH(lihp, linux_ioctl_handler_set) 1097 linux32_ioctl_unregister_handler(*lihp); 1098 mtx_destroy(&futex_mtx); 1099 if (bootverbose) 1100 printf("Linux ELF exec handler removed\n"); 1101 } else 1102 printf("Could not deinstall ELF interpreter entry\n"); 1103 break; 1104 default: 1105 return (EOPNOTSUPP); 1106 } 1107 return (error); 1108 } 1109 1110 static moduledata_t linux_elf_mod = { 1111 "linuxelf", 1112 linux_elf_modevent, 1113 0 1114 }; 1115 1116 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1117 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1118 FEATURE(linux, "Linux 32bit support"); 1119