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 <= AT_COUNT, ("Too many auxargs")); 253 254 error = copyout(&argarray[0], auxbase, sizeof(*argarray) * AT_COUNT); 255 free(argarray, M_TEMP); 256 if (error != 0) 257 return (error); 258 259 base--; 260 if (suword32(base, (uint32_t)imgp->args->argc) == -1) 261 return (EFAULT); 262 *stack_base = (register_t *)base; 263 return (0); 264 } 265 266 static void 267 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 268 { 269 struct thread *td = curthread; 270 struct proc *p = td->td_proc; 271 struct sigacts *psp; 272 struct trapframe *regs; 273 struct l_rt_sigframe *fp, frame; 274 int oonstack; 275 int sig; 276 int code; 277 278 sig = ksi->ksi_signo; 279 code = ksi->ksi_code; 280 PROC_LOCK_ASSERT(p, MA_OWNED); 281 psp = p->p_sigacts; 282 mtx_assert(&psp->ps_mtx, MA_OWNED); 283 regs = td->td_frame; 284 oonstack = sigonstack(regs->tf_rsp); 285 286 #ifdef DEBUG 287 if (ldebug(rt_sendsig)) 288 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 289 catcher, sig, (void*)mask, code); 290 #endif 291 /* Allocate space for the signal handler context. */ 292 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 293 SIGISMEMBER(psp->ps_sigonstack, sig)) { 294 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 295 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 296 } else 297 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 298 mtx_unlock(&psp->ps_mtx); 299 300 /* Build the argument list for the signal handler. */ 301 sig = bsd_to_linux_signal(sig); 302 303 bzero(&frame, sizeof(frame)); 304 305 frame.sf_handler = PTROUT(catcher); 306 frame.sf_sig = sig; 307 frame.sf_siginfo = PTROUT(&fp->sf_si); 308 frame.sf_ucontext = PTROUT(&fp->sf_sc); 309 310 /* Fill in POSIX parts. */ 311 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 312 313 /* 314 * Build the signal context to be used by sigreturn and libgcc unwind. 315 */ 316 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 317 frame.sf_sc.uc_link = 0; /* XXX ??? */ 318 319 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 320 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 321 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 322 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 323 PROC_UNLOCK(p); 324 325 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 326 327 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 328 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 329 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 330 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 331 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 332 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 333 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 334 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 335 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 336 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 337 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 338 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 339 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 340 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 341 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 342 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 343 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 344 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 345 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 346 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 347 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 348 349 #ifdef DEBUG 350 if (ldebug(rt_sendsig)) 351 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 352 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 353 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 354 #endif 355 356 if (copyout(&frame, fp, sizeof(frame)) != 0) { 357 /* 358 * Process has trashed its stack; give it an illegal 359 * instruction to halt it in its tracks. 360 */ 361 #ifdef DEBUG 362 if (ldebug(rt_sendsig)) 363 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 364 fp, oonstack); 365 #endif 366 PROC_LOCK(p); 367 sigexit(td, SIGILL); 368 } 369 370 /* Build context to run handler in. */ 371 regs->tf_rsp = PTROUT(fp); 372 regs->tf_rip = linux32_rt_sigcode; 373 regs->tf_rflags &= ~(PSL_T | PSL_D); 374 regs->tf_cs = _ucode32sel; 375 regs->tf_ss = _udatasel; 376 regs->tf_ds = _udatasel; 377 regs->tf_es = _udatasel; 378 regs->tf_fs = _ufssel; 379 regs->tf_gs = _ugssel; 380 regs->tf_flags = TF_HASSEGS; 381 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 382 PROC_LOCK(p); 383 mtx_lock(&psp->ps_mtx); 384 } 385 386 387 /* 388 * Send an interrupt to process. 389 * 390 * Stack is set up to allow sigcode stored 391 * in u. to call routine, followed by kcall 392 * to sigreturn routine below. After sigreturn 393 * resets the signal mask, the stack, and the 394 * frame pointer, it returns to the user 395 * specified pc, psl. 396 */ 397 static void 398 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 399 { 400 struct thread *td = curthread; 401 struct proc *p = td->td_proc; 402 struct sigacts *psp; 403 struct trapframe *regs; 404 struct l_sigframe *fp, frame; 405 l_sigset_t lmask; 406 int oonstack; 407 int sig, code; 408 409 sig = ksi->ksi_signo; 410 code = ksi->ksi_code; 411 PROC_LOCK_ASSERT(p, MA_OWNED); 412 psp = p->p_sigacts; 413 mtx_assert(&psp->ps_mtx, MA_OWNED); 414 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 415 /* Signal handler installed with SA_SIGINFO. */ 416 linux_rt_sendsig(catcher, ksi, mask); 417 return; 418 } 419 420 regs = td->td_frame; 421 oonstack = sigonstack(regs->tf_rsp); 422 423 #ifdef DEBUG 424 if (ldebug(sendsig)) 425 printf(ARGS(sendsig, "%p, %d, %p, %u"), 426 catcher, sig, (void*)mask, code); 427 #endif 428 429 /* Allocate space for the signal handler context. */ 430 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 431 SIGISMEMBER(psp->ps_sigonstack, sig)) { 432 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 433 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 434 } else 435 fp = (struct l_sigframe *)regs->tf_rsp - 1; 436 mtx_unlock(&psp->ps_mtx); 437 PROC_UNLOCK(p); 438 439 /* Build the argument list for the signal handler. */ 440 sig = bsd_to_linux_signal(sig); 441 442 bzero(&frame, sizeof(frame)); 443 444 frame.sf_handler = PTROUT(catcher); 445 frame.sf_sig = sig; 446 447 bsd_to_linux_sigset(mask, &lmask); 448 449 /* Build the signal context to be used by sigreturn. */ 450 frame.sf_sc.sc_mask = lmask.__mask; 451 frame.sf_sc.sc_gs = regs->tf_gs; 452 frame.sf_sc.sc_fs = regs->tf_fs; 453 frame.sf_sc.sc_es = regs->tf_es; 454 frame.sf_sc.sc_ds = regs->tf_ds; 455 frame.sf_sc.sc_edi = regs->tf_rdi; 456 frame.sf_sc.sc_esi = regs->tf_rsi; 457 frame.sf_sc.sc_ebp = regs->tf_rbp; 458 frame.sf_sc.sc_ebx = regs->tf_rbx; 459 frame.sf_sc.sc_esp = regs->tf_rsp; 460 frame.sf_sc.sc_edx = regs->tf_rdx; 461 frame.sf_sc.sc_ecx = regs->tf_rcx; 462 frame.sf_sc.sc_eax = regs->tf_rax; 463 frame.sf_sc.sc_eip = regs->tf_rip; 464 frame.sf_sc.sc_cs = regs->tf_cs; 465 frame.sf_sc.sc_eflags = regs->tf_rflags; 466 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 467 frame.sf_sc.sc_ss = regs->tf_ss; 468 frame.sf_sc.sc_err = regs->tf_err; 469 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 470 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 471 472 frame.sf_extramask[0] = lmask.__mask; 473 474 if (copyout(&frame, fp, sizeof(frame)) != 0) { 475 /* 476 * Process has trashed its stack; give it an illegal 477 * instruction to halt it in its tracks. 478 */ 479 PROC_LOCK(p); 480 sigexit(td, SIGILL); 481 } 482 483 /* Build context to run handler in. */ 484 regs->tf_rsp = PTROUT(fp); 485 regs->tf_rip = linux32_sigcode; 486 regs->tf_rflags &= ~(PSL_T | PSL_D); 487 regs->tf_cs = _ucode32sel; 488 regs->tf_ss = _udatasel; 489 regs->tf_ds = _udatasel; 490 regs->tf_es = _udatasel; 491 regs->tf_fs = _ufssel; 492 regs->tf_gs = _ugssel; 493 regs->tf_flags = TF_HASSEGS; 494 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 495 PROC_LOCK(p); 496 mtx_lock(&psp->ps_mtx); 497 } 498 499 /* 500 * System call to cleanup state after a signal 501 * has been taken. Reset signal mask and 502 * stack state from context left by sendsig (above). 503 * Return to previous pc and psl as specified by 504 * context left by sendsig. Check carefully to 505 * make sure that the user has not modified the 506 * psl to gain improper privileges or to cause 507 * a machine fault. 508 */ 509 int 510 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 511 { 512 struct l_sigframe frame; 513 struct trapframe *regs; 514 sigset_t bmask; 515 l_sigset_t lmask; 516 int eflags; 517 ksiginfo_t ksi; 518 519 regs = td->td_frame; 520 521 #ifdef DEBUG 522 if (ldebug(sigreturn)) 523 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 524 #endif 525 /* 526 * The trampoline code hands us the sigframe. 527 * It is unsafe to keep track of it ourselves, in the event that a 528 * program jumps out of a signal handler. 529 */ 530 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 531 return (EFAULT); 532 533 /* Check for security violations. */ 534 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 535 eflags = frame.sf_sc.sc_eflags; 536 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 537 return(EINVAL); 538 539 /* 540 * Don't allow users to load a valid privileged %cs. Let the 541 * hardware check for invalid selectors, excess privilege in 542 * other selectors, invalid %eip's and invalid %esp's. 543 */ 544 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 545 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 546 ksiginfo_init_trap(&ksi); 547 ksi.ksi_signo = SIGBUS; 548 ksi.ksi_code = BUS_OBJERR; 549 ksi.ksi_trapno = T_PROTFLT; 550 ksi.ksi_addr = (void *)regs->tf_rip; 551 trapsignal(td, &ksi); 552 return(EINVAL); 553 } 554 555 lmask.__mask = frame.sf_sc.sc_mask; 556 lmask.__mask = frame.sf_extramask[0]; 557 linux_to_bsd_sigset(&lmask, &bmask); 558 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 559 560 /* Restore signal context. */ 561 regs->tf_rdi = frame.sf_sc.sc_edi; 562 regs->tf_rsi = frame.sf_sc.sc_esi; 563 regs->tf_rbp = frame.sf_sc.sc_ebp; 564 regs->tf_rbx = frame.sf_sc.sc_ebx; 565 regs->tf_rdx = frame.sf_sc.sc_edx; 566 regs->tf_rcx = frame.sf_sc.sc_ecx; 567 regs->tf_rax = frame.sf_sc.sc_eax; 568 regs->tf_rip = frame.sf_sc.sc_eip; 569 regs->tf_cs = frame.sf_sc.sc_cs; 570 regs->tf_ds = frame.sf_sc.sc_ds; 571 regs->tf_es = frame.sf_sc.sc_es; 572 regs->tf_fs = frame.sf_sc.sc_fs; 573 regs->tf_gs = frame.sf_sc.sc_gs; 574 regs->tf_rflags = eflags; 575 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 576 regs->tf_ss = frame.sf_sc.sc_ss; 577 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 578 579 return (EJUSTRETURN); 580 } 581 582 /* 583 * System call to cleanup state after a signal 584 * has been taken. Reset signal mask and 585 * stack state from context left by rt_sendsig (above). 586 * Return to previous pc and psl as specified by 587 * context left by sendsig. Check carefully to 588 * make sure that the user has not modified the 589 * psl to gain improper privileges or to cause 590 * a machine fault. 591 */ 592 int 593 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 594 { 595 struct l_ucontext uc; 596 struct l_sigcontext *context; 597 sigset_t bmask; 598 l_stack_t *lss; 599 stack_t ss; 600 struct trapframe *regs; 601 int eflags; 602 ksiginfo_t ksi; 603 604 regs = td->td_frame; 605 606 #ifdef DEBUG 607 if (ldebug(rt_sigreturn)) 608 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 609 #endif 610 /* 611 * The trampoline code hands us the ucontext. 612 * It is unsafe to keep track of it ourselves, in the event that a 613 * program jumps out of a signal handler. 614 */ 615 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 616 return (EFAULT); 617 618 context = &uc.uc_mcontext; 619 620 /* Check for security violations. */ 621 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 622 eflags = context->sc_eflags; 623 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 624 return(EINVAL); 625 626 /* 627 * Don't allow users to load a valid privileged %cs. Let the 628 * hardware check for invalid selectors, excess privilege in 629 * other selectors, invalid %eip's and invalid %esp's. 630 */ 631 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 632 if (!CS_SECURE(context->sc_cs)) { 633 ksiginfo_init_trap(&ksi); 634 ksi.ksi_signo = SIGBUS; 635 ksi.ksi_code = BUS_OBJERR; 636 ksi.ksi_trapno = T_PROTFLT; 637 ksi.ksi_addr = (void *)regs->tf_rip; 638 trapsignal(td, &ksi); 639 return(EINVAL); 640 } 641 642 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 643 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 644 645 /* 646 * Restore signal context 647 */ 648 regs->tf_gs = context->sc_gs; 649 regs->tf_fs = context->sc_fs; 650 regs->tf_es = context->sc_es; 651 regs->tf_ds = context->sc_ds; 652 regs->tf_rdi = context->sc_edi; 653 regs->tf_rsi = context->sc_esi; 654 regs->tf_rbp = context->sc_ebp; 655 regs->tf_rbx = context->sc_ebx; 656 regs->tf_rdx = context->sc_edx; 657 regs->tf_rcx = context->sc_ecx; 658 regs->tf_rax = context->sc_eax; 659 regs->tf_rip = context->sc_eip; 660 regs->tf_cs = context->sc_cs; 661 regs->tf_rflags = eflags; 662 regs->tf_rsp = context->sc_esp_at_signal; 663 regs->tf_ss = context->sc_ss; 664 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 665 666 /* 667 * call sigaltstack & ignore results.. 668 */ 669 lss = &uc.uc_stack; 670 ss.ss_sp = PTRIN(lss->ss_sp); 671 ss.ss_size = lss->ss_size; 672 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 673 674 #ifdef DEBUG 675 if (ldebug(rt_sigreturn)) 676 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 677 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 678 #endif 679 (void)kern_sigaltstack(td, &ss, NULL); 680 681 return (EJUSTRETURN); 682 } 683 684 static int 685 linux32_fetch_syscall_args(struct thread *td) 686 { 687 struct proc *p; 688 struct trapframe *frame; 689 struct syscall_args *sa; 690 691 p = td->td_proc; 692 frame = td->td_frame; 693 sa = &td->td_sa; 694 695 sa->args[0] = frame->tf_rbx; 696 sa->args[1] = frame->tf_rcx; 697 sa->args[2] = frame->tf_rdx; 698 sa->args[3] = frame->tf_rsi; 699 sa->args[4] = frame->tf_rdi; 700 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 701 sa->code = frame->tf_rax; 702 703 if (sa->code >= p->p_sysent->sv_size) 704 /* nosys */ 705 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 706 else 707 sa->callp = &p->p_sysent->sv_table[sa->code]; 708 sa->narg = sa->callp->sy_narg; 709 710 td->td_retval[0] = 0; 711 td->td_retval[1] = frame->tf_rdx; 712 713 return (0); 714 } 715 716 /* 717 * Clear registers on exec 718 * XXX copied from ia32_signal.c. 719 */ 720 static void 721 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 722 { 723 struct trapframe *regs = td->td_frame; 724 struct pcb *pcb = td->td_pcb; 725 register_t saved_rflags; 726 727 regs = td->td_frame; 728 pcb = td->td_pcb; 729 730 if (td->td_proc->p_md.md_ldt != NULL) 731 user_ldt_free(td); 732 733 critical_enter(); 734 wrmsr(MSR_FSBASE, 0); 735 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 736 pcb->pcb_fsbase = 0; 737 pcb->pcb_gsbase = 0; 738 critical_exit(); 739 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 740 741 saved_rflags = regs->tf_rflags & PSL_T; 742 bzero((char *)regs, sizeof(struct trapframe)); 743 regs->tf_rip = imgp->entry_addr; 744 regs->tf_rsp = stack; 745 regs->tf_rflags = PSL_USER | saved_rflags; 746 regs->tf_gs = _ugssel; 747 regs->tf_fs = _ufssel; 748 regs->tf_es = _udatasel; 749 regs->tf_ds = _udatasel; 750 regs->tf_ss = _udatasel; 751 regs->tf_flags = TF_HASSEGS; 752 regs->tf_cs = _ucode32sel; 753 regs->tf_rbx = imgp->ps_strings; 754 755 fpstate_drop(td); 756 757 /* Do full restore on return so that we can change to a different %cs */ 758 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 759 } 760 761 /* 762 * XXX copied from ia32_sysvec.c. 763 */ 764 static register_t * 765 linux_copyout_strings(struct image_params *imgp) 766 { 767 int argc, envc; 768 u_int32_t *vectp; 769 char *stringp, *destp; 770 u_int32_t *stack_base; 771 struct linux32_ps_strings *arginfo; 772 char canary[LINUX_AT_RANDOM_LEN]; 773 size_t execpath_len; 774 775 /* Calculate string base and vector table pointers. */ 776 if (imgp->execpath != NULL && imgp->auxargs != NULL) 777 execpath_len = strlen(imgp->execpath) + 1; 778 else 779 execpath_len = 0; 780 781 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 782 destp = (caddr_t)arginfo - SPARE_USRSPACE - 783 roundup(sizeof(canary), sizeof(char *)) - 784 roundup(execpath_len, sizeof(char *)) - 785 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 786 787 if (execpath_len != 0) { 788 imgp->execpathp = (uintptr_t)arginfo - execpath_len; 789 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 790 } 791 792 /* Prepare the canary for SSP. */ 793 arc4rand(canary, sizeof(canary), 0); 794 imgp->canary = (uintptr_t)arginfo - 795 roundup(execpath_len, sizeof(char *)) - 796 roundup(sizeof(canary), sizeof(char *)); 797 copyout(canary, (void *)imgp->canary, sizeof(canary)); 798 799 vectp = (uint32_t *)destp; 800 if (imgp->auxargs) { 801 /* 802 * Allocate room on the stack for the ELF auxargs 803 * array. It has LINUX_AT_COUNT entries. 804 */ 805 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo), 806 sizeof(*vectp)); 807 } 808 809 /* 810 * Allocate room for the argv[] and env vectors including the 811 * terminating NULL pointers. 812 */ 813 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 814 815 /* vectp also becomes our initial stack base. */ 816 stack_base = vectp; 817 818 stringp = imgp->args->begin_argv; 819 argc = imgp->args->argc; 820 envc = imgp->args->envc; 821 /* Copy out strings - arguments and environment. */ 822 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 823 824 /* Fill in "ps_strings" struct for ps, w, etc. */ 825 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 826 suword32(&arginfo->ps_nargvstr, argc); 827 828 /* Fill in argument portion of vector table. */ 829 for (; argc > 0; --argc) { 830 suword32(vectp++, (uint32_t)(intptr_t)destp); 831 while (*stringp++ != 0) 832 destp++; 833 destp++; 834 } 835 836 /* A null vector table pointer separates the argp's from the envp's. */ 837 suword32(vectp++, 0); 838 839 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 840 suword32(&arginfo->ps_nenvstr, envc); 841 842 /* Fill in environment portion of vector table. */ 843 for (; envc > 0; --envc) { 844 suword32(vectp++, (uint32_t)(intptr_t)destp); 845 while (*stringp++ != 0) 846 destp++; 847 destp++; 848 } 849 850 /* The end of the vector table is a null pointer. */ 851 suword32(vectp, 0); 852 853 return ((register_t *)stack_base); 854 } 855 856 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 857 "32-bit Linux emulation"); 858 859 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 860 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 861 &linux32_maxdsiz, 0, ""); 862 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 863 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 864 &linux32_maxssiz, 0, ""); 865 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 866 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 867 &linux32_maxvmem, 0, ""); 868 869 #if defined(DEBUG) 870 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 871 linux_sysctl_debug, "A", "Linux debugging control"); 872 #endif 873 874 static void 875 linux32_fixlimit(struct rlimit *rl, int which) 876 { 877 878 switch (which) { 879 case RLIMIT_DATA: 880 if (linux32_maxdsiz != 0) { 881 if (rl->rlim_cur > linux32_maxdsiz) 882 rl->rlim_cur = linux32_maxdsiz; 883 if (rl->rlim_max > linux32_maxdsiz) 884 rl->rlim_max = linux32_maxdsiz; 885 } 886 break; 887 case RLIMIT_STACK: 888 if (linux32_maxssiz != 0) { 889 if (rl->rlim_cur > linux32_maxssiz) 890 rl->rlim_cur = linux32_maxssiz; 891 if (rl->rlim_max > linux32_maxssiz) 892 rl->rlim_max = linux32_maxssiz; 893 } 894 break; 895 case RLIMIT_VMEM: 896 if (linux32_maxvmem != 0) { 897 if (rl->rlim_cur > linux32_maxvmem) 898 rl->rlim_cur = linux32_maxvmem; 899 if (rl->rlim_max > linux32_maxvmem) 900 rl->rlim_max = linux32_maxvmem; 901 } 902 break; 903 } 904 } 905 906 struct sysentvec elf_linux_sysvec = { 907 .sv_size = LINUX32_SYS_MAXSYSCALL, 908 .sv_table = linux32_sysent, 909 .sv_mask = 0, 910 .sv_errsize = ELAST + 1, 911 .sv_errtbl = linux_errtbl, 912 .sv_transtrap = linux_translate_traps, 913 .sv_fixup = linux_fixup_elf, 914 .sv_sendsig = linux_sendsig, 915 .sv_sigcode = &_binary_linux32_locore_o_start, 916 .sv_szsigcode = &linux_szsigcode, 917 .sv_name = "Linux ELF32", 918 .sv_coredump = elf32_coredump, 919 .sv_imgact_try = linux_exec_imgact_try, 920 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 921 .sv_pagesize = PAGE_SIZE, 922 .sv_minuser = VM_MIN_ADDRESS, 923 .sv_maxuser = LINUX32_MAXUSER, 924 .sv_usrstack = LINUX32_USRSTACK, 925 .sv_psstrings = LINUX32_PS_STRINGS, 926 .sv_stackprot = VM_PROT_ALL, 927 .sv_copyout_strings = linux_copyout_strings, 928 .sv_setregs = linux_exec_setregs, 929 .sv_fixlimit = linux32_fixlimit, 930 .sv_maxssiz = &linux32_maxssiz, 931 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP, 932 .sv_set_syscall_retval = cpu_set_syscall_retval, 933 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 934 .sv_syscallnames = NULL, 935 .sv_shared_page_base = LINUX32_SHAREDPAGE, 936 .sv_shared_page_len = PAGE_SIZE, 937 .sv_schedtail = linux_schedtail, 938 .sv_thread_detach = linux_thread_detach, 939 .sv_trap = NULL, 940 }; 941 942 static void 943 linux_vdso_install(void *param) 944 { 945 946 linux_szsigcode = (&_binary_linux32_locore_o_end - 947 &_binary_linux32_locore_o_start); 948 949 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 950 panic("Linux invalid vdso size\n"); 951 952 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 953 954 linux_shared_page_obj = __elfN(linux_shared_page_init) 955 (&linux_shared_page_mapping); 956 957 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 958 959 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 960 linux_szsigcode); 961 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 962 963 linux_kplatform = linux_shared_page_mapping + 964 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 965 } 966 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 967 linux_vdso_install, NULL); 968 969 static void 970 linux_vdso_deinstall(void *param) 971 { 972 973 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 974 } 975 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 976 linux_vdso_deinstall, NULL); 977 978 static char GNU_ABI_VENDOR[] = "GNU"; 979 static int GNULINUX_ABI_DESC = 0; 980 981 static bool 982 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 983 { 984 const Elf32_Word *desc; 985 uintptr_t p; 986 987 p = (uintptr_t)(note + 1); 988 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 989 990 desc = (const Elf32_Word *)p; 991 if (desc[0] != GNULINUX_ABI_DESC) 992 return (false); 993 994 /* 995 * For Linux we encode osrel as follows (see linux_mib.c): 996 * VVVMMMIII (version, major, minor), see linux_mib.c. 997 */ 998 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 999 1000 return (true); 1001 } 1002 1003 static Elf_Brandnote linux32_brandnote = { 1004 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1005 .hdr.n_descsz = 16, /* XXX at least 16 */ 1006 .hdr.n_type = 1, 1007 .vendor = GNU_ABI_VENDOR, 1008 .flags = BN_TRANSLATE_OSREL, 1009 .trans_osrel = linux32_trans_osrel 1010 }; 1011 1012 static Elf32_Brandinfo linux_brand = { 1013 .brand = ELFOSABI_LINUX, 1014 .machine = EM_386, 1015 .compat_3_brand = "Linux", 1016 .emul_path = "/compat/linux", 1017 .interp_path = "/lib/ld-linux.so.1", 1018 .sysvec = &elf_linux_sysvec, 1019 .interp_newpath = NULL, 1020 .brand_note = &linux32_brandnote, 1021 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1022 }; 1023 1024 static Elf32_Brandinfo linux_glibc2brand = { 1025 .brand = ELFOSABI_LINUX, 1026 .machine = EM_386, 1027 .compat_3_brand = "Linux", 1028 .emul_path = "/compat/linux", 1029 .interp_path = "/lib/ld-linux.so.2", 1030 .sysvec = &elf_linux_sysvec, 1031 .interp_newpath = NULL, 1032 .brand_note = &linux32_brandnote, 1033 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1034 }; 1035 1036 static Elf32_Brandinfo linux_muslbrand = { 1037 .brand = ELFOSABI_LINUX, 1038 .machine = EM_386, 1039 .compat_3_brand = "Linux", 1040 .emul_path = "/compat/linux", 1041 .interp_path = "/lib/ld-musl-i386.so.1", 1042 .sysvec = &elf_linux_sysvec, 1043 .interp_newpath = NULL, 1044 .brand_note = &linux32_brandnote, 1045 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1046 }; 1047 1048 Elf32_Brandinfo *linux_brandlist[] = { 1049 &linux_brand, 1050 &linux_glibc2brand, 1051 &linux_muslbrand, 1052 NULL 1053 }; 1054 1055 static int 1056 linux_elf_modevent(module_t mod, int type, void *data) 1057 { 1058 Elf32_Brandinfo **brandinfo; 1059 int error; 1060 struct linux_ioctl_handler **lihp; 1061 1062 error = 0; 1063 1064 switch(type) { 1065 case MOD_LOAD: 1066 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1067 ++brandinfo) 1068 if (elf32_insert_brand_entry(*brandinfo) < 0) 1069 error = EINVAL; 1070 if (error == 0) { 1071 SET_FOREACH(lihp, linux_ioctl_handler_set) 1072 linux_ioctl_register_handler(*lihp); 1073 LIST_INIT(&futex_list); 1074 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1075 stclohz = (stathz ? stathz : hz); 1076 if (bootverbose) 1077 printf("Linux ELF exec handler installed\n"); 1078 } else 1079 printf("cannot insert Linux ELF brand handler\n"); 1080 break; 1081 case MOD_UNLOAD: 1082 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1083 ++brandinfo) 1084 if (elf32_brand_inuse(*brandinfo)) 1085 error = EBUSY; 1086 if (error == 0) { 1087 for (brandinfo = &linux_brandlist[0]; 1088 *brandinfo != NULL; ++brandinfo) 1089 if (elf32_remove_brand_entry(*brandinfo) < 0) 1090 error = EINVAL; 1091 } 1092 if (error == 0) { 1093 SET_FOREACH(lihp, linux_ioctl_handler_set) 1094 linux_ioctl_unregister_handler(*lihp); 1095 mtx_destroy(&futex_mtx); 1096 if (bootverbose) 1097 printf("Linux ELF exec handler removed\n"); 1098 } else 1099 printf("Could not deinstall ELF interpreter entry\n"); 1100 break; 1101 default: 1102 return (EOPNOTSUPP); 1103 } 1104 return (error); 1105 } 1106 1107 static moduledata_t linux_elf_mod = { 1108 "linuxelf", 1109 linux_elf_modevent, 1110 0 1111 }; 1112 1113 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1114 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1115 FEATURE(linux, "Linux 32bit support"); 1116