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/exec.h> 46 #include <sys/fcntl.h> 47 #include <sys/imgact.h> 48 #include <sys/imgact_elf.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/module.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/stddef.h> 56 #include <sys/syscallsubr.h> 57 #include <sys/sysctl.h> 58 #include <sys/sysent.h> 59 60 #include <vm/pmap.h> 61 #include <vm/vm.h> 62 #include <vm/vm_map.h> 63 #include <vm/vm_page.h> 64 65 #include <machine/cpu.h> 66 #include <machine/md_var.h> 67 #include <machine/pcb.h> 68 #include <machine/specialreg.h> 69 #include <machine/trap.h> 70 71 #include <x86/linux/linux_x86.h> 72 #include <amd64/linux32/linux.h> 73 #include <amd64/linux32/linux32_proto.h> 74 #include <compat/linux/linux_elf.h> 75 #include <compat/linux/linux_emul.h> 76 #include <compat/linux/linux_fork.h> 77 #include <compat/linux/linux_ioctl.h> 78 #include <compat/linux/linux_mib.h> 79 #include <compat/linux/linux_misc.h> 80 #include <compat/linux/linux_signal.h> 81 #include <compat/linux/linux_util.h> 82 #include <compat/linux/linux_vdso.h> 83 84 #include <x86/linux/linux_x86_sigframe.h> 85 86 MODULE_VERSION(linux, 1); 87 88 #define LINUX32_MAXUSER ((1ul << 32) - PAGE_SIZE) 89 #define LINUX32_VDSOPAGE_SIZE PAGE_SIZE * 2 90 #define LINUX32_VDSOPAGE (LINUX32_MAXUSER - LINUX32_VDSOPAGE_SIZE) 91 #define LINUX32_SHAREDPAGE (LINUX32_VDSOPAGE - PAGE_SIZE) 92 /* 93 * PAGE_SIZE - the size 94 * of the native SHAREDPAGE 95 */ 96 #define LINUX32_USRSTACK LINUX32_SHAREDPAGE 97 98 static int linux_szsigcode; 99 static vm_object_t linux_vdso_obj; 100 static char *linux_vdso_mapping; 101 extern char _binary_linux32_vdso_so_o_start; 102 extern char _binary_linux32_vdso_so_o_end; 103 static vm_offset_t linux_vdso_base; 104 105 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 106 extern const char *linux32_syscallnames[]; 107 108 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 109 110 static int linux_copyout_strings(struct image_params *imgp, 111 uintptr_t *stack_base); 112 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 113 static void linux_exec_setregs(struct thread *td, 114 struct image_params *imgp, uintptr_t stack); 115 static void linux_exec_sysvec_init(void *param); 116 static int linux_on_exec_vmspace(struct proc *p, 117 struct image_params *imgp); 118 static void linux32_fixlimit(struct rlimit *rl, int which); 119 static void linux_vdso_install(const void *param); 120 static void linux_vdso_deinstall(const void *param); 121 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 122 static void linux32_set_fork_retval(struct thread *td); 123 static void linux32_set_syscall_retval(struct thread *td, int error); 124 125 struct linux32_ps_strings { 126 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 127 u_int ps_nargvstr; /* the number of argument strings */ 128 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 129 u_int ps_nenvstr; /* the number of environment strings */ 130 }; 131 #define LINUX32_PS_STRINGS (LINUX32_USRSTACK - \ 132 sizeof(struct linux32_ps_strings)) 133 134 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 135 LINUX_VDSO_SYM_INTPTR(linux32_vdso_sigcode); 136 LINUX_VDSO_SYM_INTPTR(linux32_vdso_rt_sigcode); 137 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 138 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 139 LINUX_VDSO_SYM_INTPTR(kern_cpu_selector); 140 LINUX_VDSO_SYM_CHAR(linux_platform); 141 142 static int 143 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 144 { 145 Elf32_Auxargs *args; 146 Elf32_Auxinfo *argarray, *pos; 147 int error, issetugid; 148 149 args = (Elf32_Auxargs *)imgp->auxargs; 150 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 151 M_WAITOK | M_ZERO); 152 153 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 154 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 155 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 156 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 157 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 158 159 /* 160 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 161 * as it has appeared in the 2.4.0-rc7 first time. 162 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 163 * glibc falls back to the hard-coded CLK_TCK value when aux entry 164 * is not present. 165 * Also see linux_times() implementation. 166 */ 167 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 168 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 169 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 170 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 171 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 172 AUXARGS_ENTRY(pos, AT_BASE, args->base); 173 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 174 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 175 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 176 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 177 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 178 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 179 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 180 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 181 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 182 if (imgp->execpathp != 0) 183 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 184 if (args->execfd != -1) 185 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 186 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 187 AUXARGS_ENTRY(pos, AT_NULL, 0); 188 189 free(imgp->auxargs, M_TEMP); 190 imgp->auxargs = NULL; 191 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 192 193 error = copyout(argarray, (void *)base, 194 sizeof(*argarray) * LINUX_AT_COUNT); 195 free(argarray, M_TEMP); 196 return (error); 197 } 198 199 static void 200 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 201 { 202 struct thread *td = curthread; 203 struct proc *p = td->td_proc; 204 struct sigacts *psp; 205 struct trapframe *regs; 206 struct l_rt_sigframe *fp, frame; 207 int oonstack; 208 int sig; 209 int code; 210 211 sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 212 code = ksi->ksi_code; 213 PROC_LOCK_ASSERT(p, MA_OWNED); 214 psp = p->p_sigacts; 215 mtx_assert(&psp->ps_mtx, MA_OWNED); 216 regs = td->td_frame; 217 oonstack = sigonstack(regs->tf_rsp); 218 219 /* Allocate space for the signal handler context. */ 220 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 221 SIGISMEMBER(psp->ps_sigonstack, sig)) { 222 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 223 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 224 } else 225 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 226 mtx_unlock(&psp->ps_mtx); 227 228 /* Build the argument list for the signal handler. */ 229 sig = bsd_to_linux_signal(sig); 230 231 bzero(&frame, sizeof(frame)); 232 233 frame.sf_sig = sig; 234 frame.sf_siginfo = PTROUT(&fp->sf_si); 235 frame.sf_ucontext = PTROUT(&fp->sf_uc); 236 237 /* Fill in POSIX parts. */ 238 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 239 240 /* 241 * Build the signal context to be used by sigreturn and libgcc unwind. 242 */ 243 frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 244 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 245 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 246 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 247 PROC_UNLOCK(p); 248 249 bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask); 250 251 frame.sf_uc.uc_mcontext.sc_mask = frame.sf_uc.uc_sigmask.__mask; 252 frame.sf_uc.uc_mcontext.sc_edi = regs->tf_rdi; 253 frame.sf_uc.uc_mcontext.sc_esi = regs->tf_rsi; 254 frame.sf_uc.uc_mcontext.sc_ebp = regs->tf_rbp; 255 frame.sf_uc.uc_mcontext.sc_ebx = regs->tf_rbx; 256 frame.sf_uc.uc_mcontext.sc_esp = regs->tf_rsp; 257 frame.sf_uc.uc_mcontext.sc_edx = regs->tf_rdx; 258 frame.sf_uc.uc_mcontext.sc_ecx = regs->tf_rcx; 259 frame.sf_uc.uc_mcontext.sc_eax = regs->tf_rax; 260 frame.sf_uc.uc_mcontext.sc_eip = regs->tf_rip; 261 frame.sf_uc.uc_mcontext.sc_cs = regs->tf_cs; 262 frame.sf_uc.uc_mcontext.sc_gs = regs->tf_gs; 263 frame.sf_uc.uc_mcontext.sc_fs = regs->tf_fs; 264 frame.sf_uc.uc_mcontext.sc_es = regs->tf_es; 265 frame.sf_uc.uc_mcontext.sc_ds = regs->tf_ds; 266 frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_rflags; 267 frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 268 frame.sf_uc.uc_mcontext.sc_ss = regs->tf_ss; 269 frame.sf_uc.uc_mcontext.sc_err = regs->tf_err; 270 frame.sf_uc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 271 frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 272 273 if (copyout(&frame, fp, sizeof(frame)) != 0) { 274 /* 275 * Process has trashed its stack; give it an illegal 276 * instruction to halt it in its tracks. 277 */ 278 PROC_LOCK(p); 279 sigexit(td, SIGILL); 280 } 281 282 /* Build context to run handler in. */ 283 regs->tf_rsp = PTROUT(fp); 284 regs->tf_rip = linux32_vdso_rt_sigcode; 285 regs->tf_rdi = PTROUT(catcher); 286 regs->tf_rflags &= ~(PSL_T | PSL_D); 287 regs->tf_cs = _ucode32sel; 288 regs->tf_ss = _udatasel; 289 regs->tf_ds = _udatasel; 290 regs->tf_es = _udatasel; 291 regs->tf_fs = _ufssel; 292 regs->tf_gs = _ugssel; 293 regs->tf_flags = TF_HASSEGS; 294 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 295 PROC_LOCK(p); 296 mtx_lock(&psp->ps_mtx); 297 } 298 299 /* 300 * Send an interrupt to process. 301 * 302 * Stack is set up to allow sigcode stored 303 * in u. to call routine, followed by kcall 304 * to sigreturn routine below. After sigreturn 305 * resets the signal mask, the stack, and the 306 * frame pointer, it returns to the user 307 * specified pc, psl. 308 */ 309 static void 310 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 311 { 312 struct thread *td = curthread; 313 struct proc *p = td->td_proc; 314 struct sigacts *psp; 315 struct trapframe *regs; 316 struct l_sigframe *fp, frame; 317 l_sigset_t lmask; 318 int oonstack; 319 int sig, code; 320 321 sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 322 code = ksi->ksi_code; 323 PROC_LOCK_ASSERT(p, MA_OWNED); 324 psp = p->p_sigacts; 325 mtx_assert(&psp->ps_mtx, MA_OWNED); 326 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 327 /* Signal handler installed with SA_SIGINFO. */ 328 linux_rt_sendsig(catcher, ksi, mask); 329 return; 330 } 331 332 regs = td->td_frame; 333 oonstack = sigonstack(regs->tf_rsp); 334 335 /* Allocate space for the signal handler context. */ 336 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 337 SIGISMEMBER(psp->ps_sigonstack, sig)) { 338 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 339 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 340 } else 341 fp = (struct l_sigframe *)regs->tf_rsp - 1; 342 mtx_unlock(&psp->ps_mtx); 343 PROC_UNLOCK(p); 344 345 /* Build the argument list for the signal handler. */ 346 sig = bsd_to_linux_signal(sig); 347 348 bzero(&frame, sizeof(frame)); 349 350 frame.sf_sig = sig; 351 frame.sf_sigmask = *mask; 352 bsd_to_linux_sigset(mask, &lmask); 353 354 /* Build the signal context to be used by sigreturn. */ 355 frame.sf_sc.sc_mask = lmask.__mask; 356 frame.sf_sc.sc_gs = regs->tf_gs; 357 frame.sf_sc.sc_fs = regs->tf_fs; 358 frame.sf_sc.sc_es = regs->tf_es; 359 frame.sf_sc.sc_ds = regs->tf_ds; 360 frame.sf_sc.sc_edi = regs->tf_rdi; 361 frame.sf_sc.sc_esi = regs->tf_rsi; 362 frame.sf_sc.sc_ebp = regs->tf_rbp; 363 frame.sf_sc.sc_ebx = regs->tf_rbx; 364 frame.sf_sc.sc_esp = regs->tf_rsp; 365 frame.sf_sc.sc_edx = regs->tf_rdx; 366 frame.sf_sc.sc_ecx = regs->tf_rcx; 367 frame.sf_sc.sc_eax = regs->tf_rax; 368 frame.sf_sc.sc_eip = regs->tf_rip; 369 frame.sf_sc.sc_cs = regs->tf_cs; 370 frame.sf_sc.sc_eflags = regs->tf_rflags; 371 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 372 frame.sf_sc.sc_ss = regs->tf_ss; 373 frame.sf_sc.sc_err = regs->tf_err; 374 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 375 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 376 377 if (copyout(&frame, fp, sizeof(frame)) != 0) { 378 /* 379 * Process has trashed its stack; give it an illegal 380 * instruction to halt it in its tracks. 381 */ 382 PROC_LOCK(p); 383 sigexit(td, SIGILL); 384 } 385 386 /* Build context to run handler in. */ 387 regs->tf_rsp = PTROUT(fp); 388 regs->tf_rip = linux32_vdso_sigcode; 389 regs->tf_rdi = PTROUT(catcher); 390 regs->tf_rflags &= ~(PSL_T | PSL_D); 391 regs->tf_cs = _ucode32sel; 392 regs->tf_ss = _udatasel; 393 regs->tf_ds = _udatasel; 394 regs->tf_es = _udatasel; 395 regs->tf_fs = _ufssel; 396 regs->tf_gs = _ugssel; 397 regs->tf_flags = TF_HASSEGS; 398 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 399 PROC_LOCK(p); 400 mtx_lock(&psp->ps_mtx); 401 } 402 403 /* 404 * System call to cleanup state after a signal 405 * has been taken. Reset signal mask and 406 * stack state from context left by sendsig (above). 407 * Return to previous pc and psl as specified by 408 * context left by sendsig. Check carefully to 409 * make sure that the user has not modified the 410 * psl to gain improper privileges or to cause 411 * a machine fault. 412 */ 413 int 414 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 415 { 416 struct l_sigframe frame; 417 struct trapframe *regs; 418 int eflags; 419 ksiginfo_t ksi; 420 421 regs = td->td_frame; 422 423 /* 424 * The trampoline code hands us the sigframe. 425 * It is unsafe to keep track of it ourselves, in the event that a 426 * program jumps out of a signal handler. 427 */ 428 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 429 return (EFAULT); 430 431 /* Check for security violations. */ 432 eflags = frame.sf_sc.sc_eflags; 433 if (!EFL_SECURE(eflags, regs->tf_rflags)) 434 return(EINVAL); 435 436 /* 437 * Don't allow users to load a valid privileged %cs. Let the 438 * hardware check for invalid selectors, excess privilege in 439 * other selectors, invalid %eip's and invalid %esp's. 440 */ 441 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 442 ksiginfo_init_trap(&ksi); 443 ksi.ksi_signo = SIGBUS; 444 ksi.ksi_code = BUS_OBJERR; 445 ksi.ksi_trapno = T_PROTFLT; 446 ksi.ksi_addr = (void *)regs->tf_rip; 447 trapsignal(td, &ksi); 448 return(EINVAL); 449 } 450 451 kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0); 452 453 /* Restore signal context. */ 454 regs->tf_rdi = frame.sf_sc.sc_edi; 455 regs->tf_rsi = frame.sf_sc.sc_esi; 456 regs->tf_rbp = frame.sf_sc.sc_ebp; 457 regs->tf_rbx = frame.sf_sc.sc_ebx; 458 regs->tf_rdx = frame.sf_sc.sc_edx; 459 regs->tf_rcx = frame.sf_sc.sc_ecx; 460 regs->tf_rax = frame.sf_sc.sc_eax; 461 regs->tf_rip = frame.sf_sc.sc_eip; 462 regs->tf_cs = frame.sf_sc.sc_cs; 463 regs->tf_ds = frame.sf_sc.sc_ds; 464 regs->tf_es = frame.sf_sc.sc_es; 465 regs->tf_fs = frame.sf_sc.sc_fs; 466 regs->tf_gs = frame.sf_sc.sc_gs; 467 regs->tf_rflags = eflags; 468 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 469 regs->tf_ss = frame.sf_sc.sc_ss; 470 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 471 472 return (EJUSTRETURN); 473 } 474 475 /* 476 * System call to cleanup state after a signal 477 * has been taken. Reset signal mask and 478 * stack state from context left by rt_sendsig (above). 479 * Return to previous pc and psl as specified by 480 * context left by sendsig. Check carefully to 481 * make sure that the user has not modified the 482 * psl to gain improper privileges or to cause 483 * a machine fault. 484 */ 485 int 486 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 487 { 488 struct l_ucontext uc; 489 struct l_sigcontext *context; 490 sigset_t bmask; 491 l_stack_t *lss; 492 stack_t ss; 493 struct trapframe *regs; 494 int eflags; 495 ksiginfo_t ksi; 496 497 regs = td->td_frame; 498 499 /* 500 * The trampoline code hands us the ucontext. 501 * It is unsafe to keep track of it ourselves, in the event that a 502 * program jumps out of a signal handler. 503 */ 504 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 505 return (EFAULT); 506 507 context = &uc.uc_mcontext; 508 509 /* Check for security violations. */ 510 eflags = context->sc_eflags; 511 if (!EFL_SECURE(eflags, regs->tf_rflags)) 512 return(EINVAL); 513 514 /* 515 * Don't allow users to load a valid privileged %cs. Let the 516 * hardware check for invalid selectors, excess privilege in 517 * other selectors, invalid %eip's and invalid %esp's. 518 */ 519 if (!CS_SECURE(context->sc_cs)) { 520 ksiginfo_init_trap(&ksi); 521 ksi.ksi_signo = SIGBUS; 522 ksi.ksi_code = BUS_OBJERR; 523 ksi.ksi_trapno = T_PROTFLT; 524 ksi.ksi_addr = (void *)regs->tf_rip; 525 trapsignal(td, &ksi); 526 return(EINVAL); 527 } 528 529 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 530 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 531 532 /* 533 * Restore signal context 534 */ 535 regs->tf_gs = context->sc_gs; 536 regs->tf_fs = context->sc_fs; 537 regs->tf_es = context->sc_es; 538 regs->tf_ds = context->sc_ds; 539 regs->tf_rdi = context->sc_edi; 540 regs->tf_rsi = context->sc_esi; 541 regs->tf_rbp = context->sc_ebp; 542 regs->tf_rbx = context->sc_ebx; 543 regs->tf_rdx = context->sc_edx; 544 regs->tf_rcx = context->sc_ecx; 545 regs->tf_rax = context->sc_eax; 546 regs->tf_rip = context->sc_eip; 547 regs->tf_cs = context->sc_cs; 548 regs->tf_rflags = eflags; 549 regs->tf_rsp = context->sc_esp_at_signal; 550 regs->tf_ss = context->sc_ss; 551 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 552 553 /* 554 * call sigaltstack & ignore results.. 555 */ 556 lss = &uc.uc_stack; 557 ss.ss_sp = PTRIN(lss->ss_sp); 558 ss.ss_size = lss->ss_size; 559 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 560 561 (void)kern_sigaltstack(td, &ss, NULL); 562 563 return (EJUSTRETURN); 564 } 565 566 static int 567 linux32_fetch_syscall_args(struct thread *td) 568 { 569 struct proc *p; 570 struct trapframe *frame; 571 struct syscall_args *sa; 572 573 p = td->td_proc; 574 frame = td->td_frame; 575 sa = &td->td_sa; 576 577 sa->args[0] = frame->tf_rbx; 578 sa->args[1] = frame->tf_rcx; 579 sa->args[2] = frame->tf_rdx; 580 sa->args[3] = frame->tf_rsi; 581 sa->args[4] = frame->tf_rdi; 582 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 583 sa->code = frame->tf_rax; 584 sa->original_code = sa->code; 585 586 if (sa->code >= p->p_sysent->sv_size) 587 /* nosys */ 588 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 589 else 590 sa->callp = &p->p_sysent->sv_table[sa->code]; 591 592 td->td_retval[0] = 0; 593 td->td_retval[1] = frame->tf_rdx; 594 595 return (0); 596 } 597 598 static void 599 linux32_set_syscall_retval(struct thread *td, int error) 600 { 601 struct trapframe *frame = td->td_frame; 602 603 cpu_set_syscall_retval(td, error); 604 605 if (__predict_false(error != 0)) { 606 if (error != ERESTART && error != EJUSTRETURN) 607 frame->tf_rax = bsd_to_linux_errno(error); 608 } 609 } 610 611 static void 612 linux32_set_fork_retval(struct thread *td) 613 { 614 struct trapframe *frame = td->td_frame; 615 616 frame->tf_rax = 0; 617 } 618 619 /* 620 * Clear registers on exec 621 * XXX copied from ia32_signal.c. 622 */ 623 static void 624 linux_exec_setregs(struct thread *td, struct image_params *imgp, 625 uintptr_t stack) 626 { 627 struct trapframe *regs = td->td_frame; 628 struct pcb *pcb = td->td_pcb; 629 register_t saved_rflags; 630 631 regs = td->td_frame; 632 pcb = td->td_pcb; 633 634 if (td->td_proc->p_md.md_ldt != NULL) 635 user_ldt_free(td); 636 637 critical_enter(); 638 wrmsr(MSR_FSBASE, 0); 639 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 640 pcb->pcb_fsbase = 0; 641 pcb->pcb_gsbase = 0; 642 critical_exit(); 643 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 644 645 saved_rflags = regs->tf_rflags & PSL_T; 646 bzero((char *)regs, sizeof(struct trapframe)); 647 regs->tf_rip = imgp->entry_addr; 648 regs->tf_rsp = stack; 649 regs->tf_rflags = PSL_USER | saved_rflags; 650 regs->tf_gs = _ugssel; 651 regs->tf_fs = _ufssel; 652 regs->tf_es = _udatasel; 653 regs->tf_ds = _udatasel; 654 regs->tf_ss = _udatasel; 655 regs->tf_flags = TF_HASSEGS; 656 regs->tf_cs = _ucode32sel; 657 regs->tf_rbx = (register_t)imgp->ps_strings; 658 659 x86_clear_dbregs(pcb); 660 661 fpstate_drop(td); 662 663 /* Do full restore on return so that we can change to a different %cs */ 664 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 665 } 666 667 /* 668 * XXX copied from ia32_sysvec.c. 669 */ 670 static int 671 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 672 { 673 int argc, envc, error; 674 u_int32_t *vectp; 675 char *stringp; 676 uintptr_t destp, ustringp; 677 struct linux32_ps_strings *arginfo; 678 char canary[LINUX_AT_RANDOM_LEN]; 679 size_t execpath_len; 680 681 arginfo = (struct linux32_ps_strings *)PROC_PS_STRINGS(imgp->proc); 682 destp = (uintptr_t)arginfo; 683 684 if (imgp->execpath != NULL && imgp->auxargs != NULL) { 685 execpath_len = strlen(imgp->execpath) + 1; 686 destp -= execpath_len; 687 destp = rounddown2(destp, sizeof(uint32_t)); 688 imgp->execpathp = (void *)destp; 689 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 690 if (error != 0) 691 return (error); 692 } 693 694 /* Prepare the canary for SSP. */ 695 arc4rand(canary, sizeof(canary), 0); 696 destp -= roundup(sizeof(canary), sizeof(uint32_t)); 697 imgp->canary = (void *)destp; 698 error = copyout(canary, imgp->canary, sizeof(canary)); 699 if (error != 0) 700 return (error); 701 702 /* Allocate room for the argument and environment strings. */ 703 destp -= ARG_MAX - imgp->args->stringspace; 704 destp = rounddown2(destp, sizeof(uint32_t)); 705 ustringp = destp; 706 707 if (imgp->auxargs) { 708 /* 709 * Allocate room on the stack for the ELF auxargs 710 * array. It has LINUX_AT_COUNT entries. 711 */ 712 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 713 destp = rounddown2(destp, sizeof(uint32_t)); 714 } 715 716 vectp = (uint32_t *)destp; 717 718 /* 719 * Allocate room for the argv[] and env vectors including the 720 * terminating NULL pointers. 721 */ 722 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 723 724 /* vectp also becomes our initial stack base. */ 725 *stack_base = (uintptr_t)vectp; 726 727 stringp = imgp->args->begin_argv; 728 argc = imgp->args->argc; 729 envc = imgp->args->envc; 730 731 /* Copy out strings - arguments and environment. */ 732 error = copyout(stringp, (void *)ustringp, 733 ARG_MAX - imgp->args->stringspace); 734 if (error != 0) 735 return (error); 736 737 /* Fill in "ps_strings" struct for ps, w, etc. */ 738 if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || 739 suword32(&arginfo->ps_nargvstr, argc) != 0) 740 return (EFAULT); 741 742 /* Fill in argument portion of vector table. */ 743 for (; argc > 0; --argc) { 744 if (suword32(vectp++, ustringp) != 0) 745 return (EFAULT); 746 while (*stringp++ != 0) 747 ustringp++; 748 ustringp++; 749 } 750 751 /* A null vector table pointer separates the argp's from the envp's. */ 752 if (suword32(vectp++, 0) != 0) 753 return (EFAULT); 754 755 if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || 756 suword32(&arginfo->ps_nenvstr, envc) != 0) 757 return (EFAULT); 758 759 /* Fill in environment portion of vector table. */ 760 for (; envc > 0; --envc) { 761 if (suword32(vectp++, ustringp) != 0) 762 return (EFAULT); 763 while (*stringp++ != 0) 764 ustringp++; 765 ustringp++; 766 } 767 768 /* The end of the vector table is a null pointer. */ 769 if (suword32(vectp, 0) != 0) 770 return (EFAULT); 771 772 if (imgp->auxargs) { 773 vectp++; 774 error = imgp->sysent->sv_copyout_auxargs(imgp, 775 (uintptr_t)vectp); 776 if (error != 0) 777 return (error); 778 } 779 780 return (0); 781 } 782 783 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 784 "32-bit Linux emulation"); 785 786 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 787 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 788 &linux32_maxdsiz, 0, ""); 789 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 790 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 791 &linux32_maxssiz, 0, ""); 792 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 793 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 794 &linux32_maxvmem, 0, ""); 795 bool linux32_emulate_i386 = false; 796 SYSCTL_BOOL(_compat_linux32, OID_AUTO, emulate_i386, CTLFLAG_RWTUN, 797 &linux32_emulate_i386, 0, "Emulate the real i386"); 798 799 static void 800 linux32_fixlimit(struct rlimit *rl, int which) 801 { 802 803 switch (which) { 804 case RLIMIT_DATA: 805 if (linux32_maxdsiz != 0) { 806 if (rl->rlim_cur > linux32_maxdsiz) 807 rl->rlim_cur = linux32_maxdsiz; 808 if (rl->rlim_max > linux32_maxdsiz) 809 rl->rlim_max = linux32_maxdsiz; 810 } 811 break; 812 case RLIMIT_STACK: 813 if (linux32_maxssiz != 0) { 814 if (rl->rlim_cur > linux32_maxssiz) 815 rl->rlim_cur = linux32_maxssiz; 816 if (rl->rlim_max > linux32_maxssiz) 817 rl->rlim_max = linux32_maxssiz; 818 } 819 break; 820 case RLIMIT_VMEM: 821 if (linux32_maxvmem != 0) { 822 if (rl->rlim_cur > linux32_maxvmem) 823 rl->rlim_cur = linux32_maxvmem; 824 if (rl->rlim_max > linux32_maxvmem) 825 rl->rlim_max = linux32_maxvmem; 826 } 827 break; 828 } 829 } 830 831 struct sysentvec elf_linux_sysvec = { 832 .sv_size = LINUX32_SYS_MAXSYSCALL, 833 .sv_table = linux32_sysent, 834 .sv_fixup = elf32_freebsd_fixup, 835 .sv_sendsig = linux_sendsig, 836 .sv_sigcode = &_binary_linux32_vdso_so_o_start, 837 .sv_szsigcode = &linux_szsigcode, 838 .sv_name = "Linux ELF32", 839 .sv_coredump = elf32_coredump, 840 .sv_elf_core_osabi = ELFOSABI_NONE, 841 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 842 .sv_elf_core_prepare_notes = linux32_prepare_notes, 843 .sv_imgact_try = linux_exec_imgact_try, 844 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 845 .sv_minuser = VM_MIN_ADDRESS, 846 .sv_maxuser = LINUX32_MAXUSER, 847 .sv_usrstack = LINUX32_USRSTACK, 848 .sv_psstrings = LINUX32_PS_STRINGS, 849 .sv_psstringssz = sizeof(struct linux32_ps_strings), 850 .sv_stackprot = VM_PROT_ALL, 851 .sv_copyout_auxargs = linux_copyout_auxargs, 852 .sv_copyout_strings = linux_copyout_strings, 853 .sv_setregs = linux_exec_setregs, 854 .sv_fixlimit = linux32_fixlimit, 855 .sv_maxssiz = &linux32_maxssiz, 856 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | 857 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 858 .sv_set_syscall_retval = linux32_set_syscall_retval, 859 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 860 .sv_syscallnames = linux32_syscallnames, 861 .sv_shared_page_base = LINUX32_SHAREDPAGE, 862 .sv_shared_page_len = PAGE_SIZE, 863 .sv_schedtail = linux_schedtail, 864 .sv_thread_detach = linux_thread_detach, 865 .sv_trap = NULL, 866 .sv_onexec = linux_on_exec_vmspace, 867 .sv_onexit = linux_on_exit, 868 .sv_ontdexit = linux_thread_dtor, 869 .sv_setid_allowed = &linux_setid_allowed_query, 870 .sv_set_fork_retval = linux32_set_fork_retval, 871 }; 872 873 static int 874 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 875 { 876 int error; 877 878 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 879 LINUX32_VDSOPAGE_SIZE, imgp); 880 if (error == 0) 881 linux_on_exec(p, imgp); 882 return (error); 883 } 884 885 /* 886 * linux_vdso_install() and linux_exec_sysvec_init() must be called 887 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 888 */ 889 static void 890 linux_exec_sysvec_init(void *param) 891 { 892 l_uintptr_t *ktimekeep_base, *ktsc_selector; 893 struct sysentvec *sv; 894 ptrdiff_t tkoff; 895 896 sv = param; 897 /* Fill timekeep_base */ 898 exec_sysvec_init(sv); 899 900 tkoff = kern_timekeep_base - linux_vdso_base; 901 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 902 *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset; 903 904 tkoff = kern_tsc_selector - linux_vdso_base; 905 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 906 *ktsc_selector = linux_vdso_tsc_selector_idx(); 907 if (bootverbose) 908 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 909 910 tkoff = kern_cpu_selector - linux_vdso_base; 911 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 912 *ktsc_selector = linux_vdso_cpu_selector_idx(); 913 if (bootverbose) 914 printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector); 915 } 916 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 917 linux_exec_sysvec_init, &elf_linux_sysvec); 918 919 static void 920 linux_vdso_install(const void *param) 921 { 922 char *vdso_start = &_binary_linux32_vdso_so_o_start; 923 char *vdso_end = &_binary_linux32_vdso_so_o_end; 924 925 linux_szsigcode = vdso_end - vdso_start; 926 MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE); 927 928 linux_vdso_base = LINUX32_VDSOPAGE; 929 930 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 931 932 linux_vdso_obj = __elfN(linux_shared_page_init) 933 (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 934 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 935 936 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 937 } 938 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 939 linux_vdso_install, NULL); 940 941 static void 942 linux_vdso_deinstall(const void *param) 943 { 944 945 __elfN(linux_shared_page_fini)(linux_vdso_obj, 946 linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 947 } 948 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 949 linux_vdso_deinstall, NULL); 950 951 static void 952 linux_vdso_reloc(char *mapping, Elf_Addr offset) 953 { 954 const Elf_Shdr *shdr; 955 const Elf_Rel *rel; 956 const Elf_Ehdr *ehdr; 957 Elf32_Addr *where; 958 Elf_Size rtype, symidx; 959 Elf32_Addr addr, addend; 960 int i, relcnt; 961 962 MPASS(offset != 0); 963 964 relcnt = 0; 965 ehdr = (const Elf_Ehdr *)mapping; 966 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 967 for (i = 0; i < ehdr->e_shnum; i++) 968 { 969 switch (shdr[i].sh_type) { 970 case SHT_REL: 971 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 972 relcnt = shdr[i].sh_size / sizeof(*rel); 973 break; 974 case SHT_RELA: 975 printf("Linux i386 vDSO: unexpected Rela section\n"); 976 break; 977 } 978 } 979 980 for (i = 0; i < relcnt; i++, rel++) { 981 where = (Elf32_Addr *)(mapping + rel->r_offset); 982 addend = *where; 983 rtype = ELF_R_TYPE(rel->r_info); 984 symidx = ELF_R_SYM(rel->r_info); 985 986 switch (rtype) { 987 case R_386_NONE: /* none */ 988 break; 989 990 case R_386_RELATIVE: /* B + A */ 991 addr = (Elf32_Addr)PTROUT(offset + addend); 992 if (*where != addr) 993 *where = addr; 994 break; 995 996 case R_386_IRELATIVE: 997 printf("Linux i386 vDSO: unexpected ifunc relocation, " 998 "symbol index %ld\n", (intmax_t)symidx); 999 break; 1000 default: 1001 printf("Linux i386 vDSO: unexpected relocation type %ld, " 1002 "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx); 1003 } 1004 } 1005 } 1006 1007 static Elf_Brandnote linux32_brandnote = { 1008 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1009 .hdr.n_descsz = 16, /* XXX at least 16 */ 1010 .hdr.n_type = 1, 1011 .vendor = GNU_ABI_VENDOR, 1012 .flags = BN_TRANSLATE_OSREL, 1013 .trans_osrel = linux_trans_osrel 1014 }; 1015 1016 static Elf32_Brandinfo linux_brand = { 1017 .brand = ELFOSABI_LINUX, 1018 .machine = EM_386, 1019 .compat_3_brand = "Linux", 1020 .emul_path = linux_emul_path, 1021 .interp_path = "/lib/ld-linux.so.1", 1022 .sysvec = &elf_linux_sysvec, 1023 .interp_newpath = NULL, 1024 .brand_note = &linux32_brandnote, 1025 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1026 }; 1027 1028 static Elf32_Brandinfo linux_glibc2brand = { 1029 .brand = ELFOSABI_LINUX, 1030 .machine = EM_386, 1031 .compat_3_brand = "Linux", 1032 .emul_path = linux_emul_path, 1033 .interp_path = "/lib/ld-linux.so.2", 1034 .sysvec = &elf_linux_sysvec, 1035 .interp_newpath = NULL, 1036 .brand_note = &linux32_brandnote, 1037 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1038 }; 1039 1040 static Elf32_Brandinfo linux_muslbrand = { 1041 .brand = ELFOSABI_LINUX, 1042 .machine = EM_386, 1043 .compat_3_brand = "Linux", 1044 .emul_path = linux_emul_path, 1045 .interp_path = "/lib/ld-musl-i386.so.1", 1046 .sysvec = &elf_linux_sysvec, 1047 .interp_newpath = NULL, 1048 .brand_note = &linux32_brandnote, 1049 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1050 LINUX_BI_FUTEX_REQUEUE 1051 }; 1052 1053 Elf32_Brandinfo *linux_brandlist[] = { 1054 &linux_brand, 1055 &linux_glibc2brand, 1056 &linux_muslbrand, 1057 NULL 1058 }; 1059 1060 static int 1061 linux_elf_modevent(module_t mod, int type, void *data) 1062 { 1063 Elf32_Brandinfo **brandinfo; 1064 int error; 1065 struct linux_ioctl_handler **lihp; 1066 1067 error = 0; 1068 1069 switch(type) { 1070 case MOD_LOAD: 1071 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1072 ++brandinfo) 1073 if (elf32_insert_brand_entry(*brandinfo) < 0) 1074 error = EINVAL; 1075 if (error == 0) { 1076 SET_FOREACH(lihp, linux_ioctl_handler_set) 1077 linux32_ioctl_register_handler(*lihp); 1078 stclohz = (stathz ? stathz : hz); 1079 if (bootverbose) 1080 printf("Linux i386 ELF exec handler installed\n"); 1081 } else 1082 printf("cannot insert Linux i386 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 if (bootverbose) 1099 printf("Linux i386 ELF exec handler removed\n"); 1100 } else 1101 printf("Could not deinstall Linux i386 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