1 /*- 2 * Copyright (c) 2004 Tim J. Robbins 3 * Copyright (c) 2003 Peter Wemm 4 * Copyright (c) 2002 Doug Rabson 5 * Copyright (c) 1998-1999 Andrew Gallatin 6 * Copyright (c) 1994-1996 S�ren Schmidt 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer 14 * in this position and unchanged. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 #include "opt_compat.h" 36 37 #ifndef COMPAT_IA32 38 #error "Unable to compile Linux-emulator due to missing COMPAT_IA32 option!" 39 #endif 40 41 #define __ELF_WORD_SIZE 32 42 43 #include <sys/param.h> 44 #include <sys/systm.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/resourcevar.h> 56 #include <sys/signalvar.h> 57 #include <sys/sysctl.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysent.h> 60 #include <sys/sysproto.h> 61 #include <sys/vnode.h> 62 #include <sys/eventhandler.h> 63 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_map.h> 68 #include <vm/vm_object.h> 69 #include <vm/vm_page.h> 70 #include <vm/vm_param.h> 71 72 #include <machine/cpu.h> 73 #include <machine/md_var.h> 74 #include <machine/pcb.h> 75 #include <machine/specialreg.h> 76 77 #include <amd64/linux32/linux.h> 78 #include <amd64/linux32/linux32_proto.h> 79 #include <compat/linux/linux_emul.h> 80 #include <compat/linux/linux_mib.h> 81 #include <compat/linux/linux_signal.h> 82 #include <compat/linux/linux_util.h> 83 84 MODULE_VERSION(linux, 1); 85 86 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 87 88 #define AUXARGS_ENTRY_32(pos, id, val) \ 89 do { \ 90 suword32(pos++, id); \ 91 suword32(pos++, val); \ 92 } while (0) 93 94 #if BYTE_ORDER == LITTLE_ENDIAN 95 #define SHELLMAGIC 0x2123 /* #! */ 96 #else 97 #define SHELLMAGIC 0x2321 98 #endif 99 100 /* 101 * Allow the sendsig functions to use the ldebug() facility 102 * even though they are not syscalls themselves. Map them 103 * to syscall 0. This is slightly less bogus than using 104 * ldebug(sigreturn). 105 */ 106 #define LINUX_SYS_linux_rt_sendsig 0 107 #define LINUX_SYS_linux_sendsig 0 108 109 extern char linux_sigcode[]; 110 extern int linux_szsigcode; 111 112 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 113 114 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 115 SET_DECLARE(linux_device_handler_set, struct linux_device_handler); 116 117 static int elf_linux_fixup(register_t **stack_base, 118 struct image_params *iparams); 119 static register_t *linux_copyout_strings(struct image_params *imgp); 120 static void linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, 121 caddr_t *params); 122 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 123 static void exec_linux_setregs(struct thread *td, u_long entry, 124 u_long stack, u_long ps_strings); 125 static void linux32_fixlimit(struct rlimit *rl, int which); 126 127 extern LIST_HEAD(futex_list, futex) futex_list; 128 extern struct sx futex_sx; 129 130 static eventhandler_tag linux_exit_tag; 131 static eventhandler_tag linux_schedtail_tag; 132 static eventhandler_tag linux_exec_tag; 133 134 /* 135 * Linux syscalls return negative errno's, we do positive and map them 136 * Reference: 137 * FreeBSD: src/sys/sys/errno.h 138 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 139 * linux-2.6.17.8/include/asm-generic/errno.h 140 */ 141 static int bsd_to_linux_errno[ELAST + 1] = { 142 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 143 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 144 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 145 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 146 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 147 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 148 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 149 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 150 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 151 -72, -67, -71 152 }; 153 154 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 155 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 156 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 157 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 158 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 159 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 160 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 161 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 162 0, LINUX_SIGUSR1, LINUX_SIGUSR2 163 }; 164 165 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 166 SIGHUP, SIGINT, SIGQUIT, SIGILL, 167 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 168 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 169 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 170 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 171 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 172 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 173 SIGIO, SIGURG, SIGSYS 174 }; 175 176 #define LINUX_T_UNKNOWN 255 177 static int _bsd_to_linux_trapcode[] = { 178 LINUX_T_UNKNOWN, /* 0 */ 179 6, /* 1 T_PRIVINFLT */ 180 LINUX_T_UNKNOWN, /* 2 */ 181 3, /* 3 T_BPTFLT */ 182 LINUX_T_UNKNOWN, /* 4 */ 183 LINUX_T_UNKNOWN, /* 5 */ 184 16, /* 6 T_ARITHTRAP */ 185 254, /* 7 T_ASTFLT */ 186 LINUX_T_UNKNOWN, /* 8 */ 187 13, /* 9 T_PROTFLT */ 188 1, /* 10 T_TRCTRAP */ 189 LINUX_T_UNKNOWN, /* 11 */ 190 14, /* 12 T_PAGEFLT */ 191 LINUX_T_UNKNOWN, /* 13 */ 192 17, /* 14 T_ALIGNFLT */ 193 LINUX_T_UNKNOWN, /* 15 */ 194 LINUX_T_UNKNOWN, /* 16 */ 195 LINUX_T_UNKNOWN, /* 17 */ 196 0, /* 18 T_DIVIDE */ 197 2, /* 19 T_NMI */ 198 4, /* 20 T_OFLOW */ 199 5, /* 21 T_BOUND */ 200 7, /* 22 T_DNA */ 201 8, /* 23 T_DOUBLEFLT */ 202 9, /* 24 T_FPOPFLT */ 203 10, /* 25 T_TSSFLT */ 204 11, /* 26 T_SEGNPFLT */ 205 12, /* 27 T_STKFLT */ 206 18, /* 28 T_MCHK */ 207 19, /* 29 T_XMMFLT */ 208 15 /* 30 T_RESERVED */ 209 }; 210 #define bsd_to_linux_trapcode(code) \ 211 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 212 _bsd_to_linux_trapcode[(code)]: \ 213 LINUX_T_UNKNOWN) 214 215 struct linux32_ps_strings { 216 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 217 u_int ps_nargvstr; /* the number of argument strings */ 218 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 219 u_int ps_nenvstr; /* the number of environment strings */ 220 }; 221 222 /* 223 * If FreeBSD & Linux have a difference of opinion about what a trap 224 * means, deal with it here. 225 * 226 * MPSAFE 227 */ 228 static int 229 translate_traps(int signal, int trap_code) 230 { 231 if (signal != SIGBUS) 232 return signal; 233 switch (trap_code) { 234 case T_PROTFLT: 235 case T_TSSFLT: 236 case T_DOUBLEFLT: 237 case T_PAGEFLT: 238 return SIGSEGV; 239 default: 240 return signal; 241 } 242 } 243 244 static int 245 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 246 { 247 Elf32_Auxargs *args; 248 Elf32_Addr *base; 249 Elf32_Addr *pos; 250 251 KASSERT(curthread->td_proc == imgp->proc, 252 ("unsafe elf_linux_fixup(), should be curproc")); 253 base = (Elf32_Addr *)*stack_base; 254 args = (Elf32_Auxargs *)imgp->auxargs; 255 pos = base + (imgp->args->argc + imgp->args->envc + 2); 256 257 if (args->execfd != -1) 258 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd); 259 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr); 260 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent); 261 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum); 262 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz); 263 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags); 264 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry); 265 AUXARGS_ENTRY_32(pos, AT_BASE, args->base); 266 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 267 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 268 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 269 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 270 AUXARGS_ENTRY_32(pos, AT_NULL, 0); 271 272 free(imgp->auxargs, M_TEMP); 273 imgp->auxargs = NULL; 274 275 base--; 276 suword32(base, (uint32_t)imgp->args->argc); 277 *stack_base = (register_t *)base; 278 return 0; 279 } 280 281 extern int _ucodesel, _ucode32sel, _udatasel; 282 extern unsigned long linux_sznonrtsigcode; 283 284 static void 285 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 286 { 287 struct thread *td = curthread; 288 struct proc *p = td->td_proc; 289 struct sigacts *psp; 290 struct trapframe *regs; 291 struct l_rt_sigframe *fp, frame; 292 int oonstack; 293 int sig; 294 int code; 295 296 sig = ksi->ksi_signo; 297 code = ksi->ksi_code; 298 PROC_LOCK_ASSERT(p, MA_OWNED); 299 psp = p->p_sigacts; 300 mtx_assert(&psp->ps_mtx, MA_OWNED); 301 regs = td->td_frame; 302 oonstack = sigonstack(regs->tf_rsp); 303 304 #ifdef DEBUG 305 if (ldebug(rt_sendsig)) 306 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 307 catcher, sig, (void*)mask, code); 308 #endif 309 /* 310 * Allocate space for the signal handler context. 311 */ 312 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 313 SIGISMEMBER(psp->ps_sigonstack, sig)) { 314 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 315 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 316 } else 317 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 318 mtx_unlock(&psp->ps_mtx); 319 320 /* 321 * Build the argument list for the signal handler. 322 */ 323 if (p->p_sysent->sv_sigtbl) 324 if (sig <= p->p_sysent->sv_sigsize) 325 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 326 327 bzero(&frame, sizeof(frame)); 328 329 frame.sf_handler = PTROUT(catcher); 330 frame.sf_sig = sig; 331 frame.sf_siginfo = PTROUT(&fp->sf_si); 332 frame.sf_ucontext = PTROUT(&fp->sf_sc); 333 334 /* Fill in POSIX parts */ 335 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 336 337 /* 338 * Build the signal context to be used by sigreturn. 339 */ 340 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 341 frame.sf_sc.uc_link = 0; /* XXX ??? */ 342 343 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 344 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 345 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 346 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 347 PROC_UNLOCK(p); 348 349 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 350 351 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 352 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 353 frame.sf_sc.uc_mcontext.sc_fs = rfs(); 354 __asm __volatile("movl %%es,%0" : 355 "=rm" (frame.sf_sc.uc_mcontext.sc_es)); 356 __asm __volatile("movl %%ds,%0" : 357 "=rm" (frame.sf_sc.uc_mcontext.sc_ds)); 358 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 359 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 360 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 361 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 362 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 363 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 364 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 365 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 366 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 367 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 368 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 369 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 370 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 371 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 372 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 373 374 #ifdef DEBUG 375 if (ldebug(rt_sendsig)) 376 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 377 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 378 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 379 #endif 380 381 if (copyout(&frame, fp, sizeof(frame)) != 0) { 382 /* 383 * Process has trashed its stack; give it an illegal 384 * instruction to halt it in its tracks. 385 */ 386 #ifdef DEBUG 387 if (ldebug(rt_sendsig)) 388 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 389 fp, oonstack); 390 #endif 391 PROC_LOCK(p); 392 sigexit(td, SIGILL); 393 } 394 395 /* 396 * Build context to run handler in. 397 */ 398 regs->tf_rsp = PTROUT(fp); 399 regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode) + 400 linux_sznonrtsigcode; 401 regs->tf_rflags &= ~(PSL_T | PSL_D); 402 regs->tf_cs = _ucode32sel; 403 regs->tf_ss = _udatasel; 404 load_ds(_udatasel); 405 td->td_pcb->pcb_ds = _udatasel; 406 load_es(_udatasel); 407 td->td_pcb->pcb_es = _udatasel; 408 /* leave user %fs and %gs untouched */ 409 PROC_LOCK(p); 410 mtx_lock(&psp->ps_mtx); 411 } 412 413 414 /* 415 * Send an interrupt to process. 416 * 417 * Stack is set up to allow sigcode stored 418 * in u. to call routine, followed by kcall 419 * to sigreturn routine below. After sigreturn 420 * resets the signal mask, the stack, and the 421 * frame pointer, it returns to the user 422 * specified pc, psl. 423 */ 424 static void 425 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 426 { 427 struct thread *td = curthread; 428 struct proc *p = td->td_proc; 429 struct sigacts *psp; 430 struct trapframe *regs; 431 struct l_sigframe *fp, frame; 432 l_sigset_t lmask; 433 int oonstack, i; 434 int sig, code; 435 436 sig = ksi->ksi_signo; 437 code = ksi->ksi_code; 438 PROC_LOCK_ASSERT(p, MA_OWNED); 439 psp = p->p_sigacts; 440 mtx_assert(&psp->ps_mtx, MA_OWNED); 441 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 442 /* Signal handler installed with SA_SIGINFO. */ 443 linux_rt_sendsig(catcher, ksi, mask); 444 return; 445 } 446 447 regs = td->td_frame; 448 oonstack = sigonstack(regs->tf_rsp); 449 450 #ifdef DEBUG 451 if (ldebug(sendsig)) 452 printf(ARGS(sendsig, "%p, %d, %p, %u"), 453 catcher, sig, (void*)mask, code); 454 #endif 455 456 /* 457 * Allocate space for the signal handler context. 458 */ 459 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 460 SIGISMEMBER(psp->ps_sigonstack, sig)) { 461 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 462 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 463 } else 464 fp = (struct l_sigframe *)regs->tf_rsp - 1; 465 mtx_unlock(&psp->ps_mtx); 466 PROC_UNLOCK(p); 467 468 /* 469 * Build the argument list for the signal handler. 470 */ 471 if (p->p_sysent->sv_sigtbl) 472 if (sig <= p->p_sysent->sv_sigsize) 473 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 474 475 bzero(&frame, sizeof(frame)); 476 477 frame.sf_handler = PTROUT(catcher); 478 frame.sf_sig = sig; 479 480 bsd_to_linux_sigset(mask, &lmask); 481 482 /* 483 * Build the signal context to be used by sigreturn. 484 */ 485 frame.sf_sc.sc_mask = lmask.__bits[0]; 486 frame.sf_sc.sc_gs = rgs(); 487 frame.sf_sc.sc_fs = rfs(); 488 __asm __volatile("movl %%es,%0" : "=rm" (frame.sf_sc.sc_es)); 489 __asm __volatile("movl %%ds,%0" : "=rm" (frame.sf_sc.sc_ds)); 490 frame.sf_sc.sc_edi = regs->tf_rdi; 491 frame.sf_sc.sc_esi = regs->tf_rsi; 492 frame.sf_sc.sc_ebp = regs->tf_rbp; 493 frame.sf_sc.sc_ebx = regs->tf_rbx; 494 frame.sf_sc.sc_edx = regs->tf_rdx; 495 frame.sf_sc.sc_ecx = regs->tf_rcx; 496 frame.sf_sc.sc_eax = regs->tf_rax; 497 frame.sf_sc.sc_eip = regs->tf_rip; 498 frame.sf_sc.sc_cs = regs->tf_cs; 499 frame.sf_sc.sc_eflags = regs->tf_rflags; 500 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 501 frame.sf_sc.sc_ss = regs->tf_ss; 502 frame.sf_sc.sc_err = regs->tf_err; 503 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 504 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 505 506 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 507 frame.sf_extramask[i] = lmask.__bits[i+1]; 508 509 if (copyout(&frame, fp, sizeof(frame)) != 0) { 510 /* 511 * Process has trashed its stack; give it an illegal 512 * instruction to halt it in its tracks. 513 */ 514 PROC_LOCK(p); 515 sigexit(td, SIGILL); 516 } 517 518 /* 519 * Build context to run handler in. 520 */ 521 regs->tf_rsp = PTROUT(fp); 522 regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 523 regs->tf_rflags &= ~(PSL_T | PSL_D); 524 regs->tf_cs = _ucode32sel; 525 regs->tf_ss = _udatasel; 526 load_ds(_udatasel); 527 td->td_pcb->pcb_ds = _udatasel; 528 load_es(_udatasel); 529 td->td_pcb->pcb_es = _udatasel; 530 /* leave user %fs and %gs untouched */ 531 PROC_LOCK(p); 532 mtx_lock(&psp->ps_mtx); 533 } 534 535 /* 536 * System call to cleanup state after a signal 537 * has been taken. Reset signal mask and 538 * stack state from context left by sendsig (above). 539 * Return to previous pc and psl as specified by 540 * context left by sendsig. Check carefully to 541 * make sure that the user has not modified the 542 * psl to gain improper privileges or to cause 543 * a machine fault. 544 */ 545 int 546 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 547 { 548 struct proc *p = td->td_proc; 549 struct l_sigframe frame; 550 struct trapframe *regs; 551 l_sigset_t lmask; 552 int eflags, i; 553 ksiginfo_t ksi; 554 555 regs = td->td_frame; 556 557 #ifdef DEBUG 558 if (ldebug(sigreturn)) 559 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 560 #endif 561 /* 562 * The trampoline code hands us the sigframe. 563 * It is unsafe to keep track of it ourselves, in the event that a 564 * program jumps out of a signal handler. 565 */ 566 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 567 return (EFAULT); 568 569 /* 570 * Check for security violations. 571 */ 572 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 573 eflags = frame.sf_sc.sc_eflags; 574 /* 575 * XXX do allow users to change the privileged flag PSL_RF. The 576 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 577 * sometimes set it there too. tf_eflags is kept in the signal 578 * context during signal handling and there is no other place 579 * to remember it, so the PSL_RF bit may be corrupted by the 580 * signal handler without us knowing. Corruption of the PSL_RF 581 * bit at worst causes one more or one less debugger trap, so 582 * allowing it is fairly harmless. 583 */ 584 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 585 return(EINVAL); 586 587 /* 588 * Don't allow users to load a valid privileged %cs. Let the 589 * hardware check for invalid selectors, excess privilege in 590 * other selectors, invalid %eip's and invalid %esp's. 591 */ 592 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 593 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 594 ksiginfo_init_trap(&ksi); 595 ksi.ksi_signo = SIGBUS; 596 ksi.ksi_code = BUS_OBJERR; 597 ksi.ksi_trapno = T_PROTFLT; 598 ksi.ksi_addr = (void *)regs->tf_rip; 599 trapsignal(td, &ksi); 600 return(EINVAL); 601 } 602 603 lmask.__bits[0] = frame.sf_sc.sc_mask; 604 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 605 lmask.__bits[i+1] = frame.sf_extramask[i]; 606 PROC_LOCK(p); 607 linux_to_bsd_sigset(&lmask, &td->td_sigmask); 608 SIG_CANTMASK(td->td_sigmask); 609 signotify(td); 610 PROC_UNLOCK(p); 611 612 /* 613 * Restore signal context. 614 */ 615 /* Selectors were restored by the trampoline. */ 616 regs->tf_rdi = frame.sf_sc.sc_edi; 617 regs->tf_rsi = frame.sf_sc.sc_esi; 618 regs->tf_rbp = frame.sf_sc.sc_ebp; 619 regs->tf_rbx = frame.sf_sc.sc_ebx; 620 regs->tf_rdx = frame.sf_sc.sc_edx; 621 regs->tf_rcx = frame.sf_sc.sc_ecx; 622 regs->tf_rax = frame.sf_sc.sc_eax; 623 regs->tf_rip = frame.sf_sc.sc_eip; 624 regs->tf_cs = frame.sf_sc.sc_cs; 625 regs->tf_rflags = eflags; 626 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 627 regs->tf_ss = frame.sf_sc.sc_ss; 628 629 return (EJUSTRETURN); 630 } 631 632 /* 633 * System call to cleanup state after a signal 634 * has been taken. Reset signal mask and 635 * stack state from context left by rt_sendsig (above). 636 * Return to previous pc and psl as specified by 637 * context left by sendsig. Check carefully to 638 * make sure that the user has not modified the 639 * psl to gain improper privileges or to cause 640 * a machine fault. 641 */ 642 int 643 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 644 { 645 struct proc *p = td->td_proc; 646 struct l_ucontext uc; 647 struct l_sigcontext *context; 648 l_stack_t *lss; 649 stack_t ss; 650 struct trapframe *regs; 651 int eflags; 652 ksiginfo_t ksi; 653 654 regs = td->td_frame; 655 656 #ifdef DEBUG 657 if (ldebug(rt_sigreturn)) 658 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 659 #endif 660 /* 661 * The trampoline code hands us the ucontext. 662 * It is unsafe to keep track of it ourselves, in the event that a 663 * program jumps out of a signal handler. 664 */ 665 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 666 return (EFAULT); 667 668 context = &uc.uc_mcontext; 669 670 /* 671 * Check for security violations. 672 */ 673 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 674 eflags = context->sc_eflags; 675 /* 676 * XXX do allow users to change the privileged flag PSL_RF. The 677 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 678 * sometimes set it there too. tf_eflags is kept in the signal 679 * context during signal handling and there is no other place 680 * to remember it, so the PSL_RF bit may be corrupted by the 681 * signal handler without us knowing. Corruption of the PSL_RF 682 * bit at worst causes one more or one less debugger trap, so 683 * allowing it is fairly harmless. 684 */ 685 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 686 return(EINVAL); 687 688 /* 689 * Don't allow users to load a valid privileged %cs. Let the 690 * hardware check for invalid selectors, excess privilege in 691 * other selectors, invalid %eip's and invalid %esp's. 692 */ 693 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 694 if (!CS_SECURE(context->sc_cs)) { 695 ksiginfo_init_trap(&ksi); 696 ksi.ksi_signo = SIGBUS; 697 ksi.ksi_code = BUS_OBJERR; 698 ksi.ksi_trapno = T_PROTFLT; 699 ksi.ksi_addr = (void *)regs->tf_rip; 700 trapsignal(td, &ksi); 701 return(EINVAL); 702 } 703 704 PROC_LOCK(p); 705 linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask); 706 SIG_CANTMASK(td->td_sigmask); 707 signotify(td); 708 PROC_UNLOCK(p); 709 710 /* 711 * Restore signal context 712 */ 713 /* Selectors were restored by the trampoline. */ 714 regs->tf_rdi = context->sc_edi; 715 regs->tf_rsi = context->sc_esi; 716 regs->tf_rbp = context->sc_ebp; 717 regs->tf_rbx = context->sc_ebx; 718 regs->tf_rdx = context->sc_edx; 719 regs->tf_rcx = context->sc_ecx; 720 regs->tf_rax = context->sc_eax; 721 regs->tf_rip = context->sc_eip; 722 regs->tf_cs = context->sc_cs; 723 regs->tf_rflags = eflags; 724 regs->tf_rsp = context->sc_esp_at_signal; 725 regs->tf_ss = context->sc_ss; 726 727 /* 728 * call sigaltstack & ignore results.. 729 */ 730 lss = &uc.uc_stack; 731 ss.ss_sp = PTRIN(lss->ss_sp); 732 ss.ss_size = lss->ss_size; 733 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 734 735 #ifdef DEBUG 736 if (ldebug(rt_sigreturn)) 737 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 738 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 739 #endif 740 (void)kern_sigaltstack(td, &ss, NULL); 741 742 return (EJUSTRETURN); 743 } 744 745 /* 746 * MPSAFE 747 */ 748 static void 749 linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, caddr_t *params) 750 { 751 args[0] = tf->tf_rbx; 752 args[1] = tf->tf_rcx; 753 args[2] = tf->tf_rdx; 754 args[3] = tf->tf_rsi; 755 args[4] = tf->tf_rdi; 756 args[5] = tf->tf_rbp; /* Unconfirmed */ 757 *params = NULL; /* no copyin */ 758 } 759 760 /* 761 * If a linux binary is exec'ing something, try this image activator 762 * first. We override standard shell script execution in order to 763 * be able to modify the interpreter path. We only do this if a linux 764 * binary is doing the exec, so we do not create an EXEC module for it. 765 */ 766 static int exec_linux_imgact_try(struct image_params *iparams); 767 768 static int 769 exec_linux_imgact_try(struct image_params *imgp) 770 { 771 const char *head = (const char *)imgp->image_header; 772 char *rpath; 773 int error = -1, len; 774 775 /* 776 * The interpreter for shell scripts run from a linux binary needs 777 * to be located in /compat/linux if possible in order to recursively 778 * maintain linux path emulation. 779 */ 780 if (((const short *)head)[0] == SHELLMAGIC) { 781 /* 782 * Run our normal shell image activator. If it succeeds attempt 783 * to use the alternate path for the interpreter. If an alternate 784 * path is found, use our stringspace to store it. 785 */ 786 if ((error = exec_shell_imgact(imgp)) == 0) { 787 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 788 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 789 if (rpath != NULL) { 790 len = strlen(rpath) + 1; 791 792 if (len <= MAXSHELLCMDLEN) { 793 memcpy(imgp->interpreter_name, rpath, len); 794 } 795 free(rpath, M_TEMP); 796 } 797 } 798 } 799 return(error); 800 } 801 802 /* 803 * Clear registers on exec 804 * XXX copied from ia32_signal.c. 805 */ 806 static void 807 exec_linux_setregs(td, entry, stack, ps_strings) 808 struct thread *td; 809 u_long entry; 810 u_long stack; 811 u_long ps_strings; 812 { 813 struct trapframe *regs = td->td_frame; 814 struct pcb *pcb = td->td_pcb; 815 816 critical_enter(); 817 wrmsr(MSR_FSBASE, 0); 818 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 819 pcb->pcb_fsbase = 0; 820 pcb->pcb_gsbase = 0; 821 critical_exit(); 822 load_ds(_udatasel); 823 load_es(_udatasel); 824 load_fs(_udatasel); 825 load_gs(_udatasel); 826 pcb->pcb_ds = _udatasel; 827 pcb->pcb_es = _udatasel; 828 pcb->pcb_fs = _udatasel; 829 pcb->pcb_gs = _udatasel; 830 831 bzero((char *)regs, sizeof(struct trapframe)); 832 regs->tf_rip = entry; 833 regs->tf_rsp = stack; 834 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 835 regs->tf_ss = _udatasel; 836 regs->tf_cs = _ucode32sel; 837 regs->tf_rbx = ps_strings; 838 load_cr0(rcr0() | CR0_MP | CR0_TS); 839 fpstate_drop(td); 840 841 /* Return via doreti so that we can change to a different %cs */ 842 pcb->pcb_flags |= PCB_FULLCTX | PCB_32BIT; 843 pcb->pcb_flags &= ~PCB_GS32BIT; 844 td->td_retval[1] = 0; 845 } 846 847 /* 848 * XXX copied from ia32_sysvec.c. 849 */ 850 static register_t * 851 linux_copyout_strings(struct image_params *imgp) 852 { 853 int argc, envc; 854 u_int32_t *vectp; 855 char *stringp, *destp; 856 u_int32_t *stack_base; 857 struct linux32_ps_strings *arginfo; 858 int sigcodesz; 859 860 /* 861 * Calculate string base and vector table pointers. 862 * Also deal with signal trampoline code for this exec type. 863 */ 864 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 865 sigcodesz = *(imgp->proc->p_sysent->sv_szsigcode); 866 destp = (caddr_t)arginfo - sigcodesz - SPARE_USRSPACE - 867 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); 868 869 /* 870 * install sigcode 871 */ 872 if (sigcodesz) 873 copyout(imgp->proc->p_sysent->sv_sigcode, 874 ((caddr_t)arginfo - sigcodesz), sigcodesz); 875 876 /* 877 * If we have a valid auxargs ptr, prepare some room 878 * on the stack. 879 */ 880 if (imgp->auxargs) { 881 /* 882 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 883 * lower compatibility. 884 */ 885 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size 886 : (AT_COUNT * 2); 887 /* 888 * The '+ 2' is for the null pointers at the end of each of 889 * the arg and env vector sets,and imgp->auxarg_size is room 890 * for argument of Runtime loader. 891 */ 892 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 + 893 imgp->auxarg_size) * sizeof(u_int32_t)); 894 895 } else 896 /* 897 * The '+ 2' is for the null pointers at the end of each of 898 * the arg and env vector sets 899 */ 900 vectp = (u_int32_t *) 901 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t)); 902 903 /* 904 * vectp also becomes our initial stack base 905 */ 906 stack_base = vectp; 907 908 stringp = imgp->args->begin_argv; 909 argc = imgp->args->argc; 910 envc = imgp->args->envc; 911 /* 912 * Copy out strings - arguments and environment. 913 */ 914 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 915 916 /* 917 * Fill in "ps_strings" struct for ps, w, etc. 918 */ 919 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); 920 suword32(&arginfo->ps_nargvstr, argc); 921 922 /* 923 * Fill in argument portion of vector table. 924 */ 925 for (; argc > 0; --argc) { 926 suword32(vectp++, (u_int32_t)(intptr_t)destp); 927 while (*stringp++ != 0) 928 destp++; 929 destp++; 930 } 931 932 /* a null vector table pointer separates the argp's from the envp's */ 933 suword32(vectp++, 0); 934 935 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); 936 suword32(&arginfo->ps_nenvstr, envc); 937 938 /* 939 * Fill in environment portion of vector table. 940 */ 941 for (; envc > 0; --envc) { 942 suword32(vectp++, (u_int32_t)(intptr_t)destp); 943 while (*stringp++ != 0) 944 destp++; 945 destp++; 946 } 947 948 /* end of vector table is a null pointer */ 949 suword32(vectp, 0); 950 951 return ((register_t *)stack_base); 952 } 953 954 SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 955 "32-bit Linux emulation"); 956 957 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 958 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 959 &linux32_maxdsiz, 0, ""); 960 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 961 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 962 &linux32_maxssiz, 0, ""); 963 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 964 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 965 &linux32_maxvmem, 0, ""); 966 967 static void 968 linux32_fixlimit(struct rlimit *rl, int which) 969 { 970 971 switch (which) { 972 case RLIMIT_DATA: 973 if (linux32_maxdsiz != 0) { 974 if (rl->rlim_cur > linux32_maxdsiz) 975 rl->rlim_cur = linux32_maxdsiz; 976 if (rl->rlim_max > linux32_maxdsiz) 977 rl->rlim_max = linux32_maxdsiz; 978 } 979 break; 980 case RLIMIT_STACK: 981 if (linux32_maxssiz != 0) { 982 if (rl->rlim_cur > linux32_maxssiz) 983 rl->rlim_cur = linux32_maxssiz; 984 if (rl->rlim_max > linux32_maxssiz) 985 rl->rlim_max = linux32_maxssiz; 986 } 987 break; 988 case RLIMIT_VMEM: 989 if (linux32_maxvmem != 0) { 990 if (rl->rlim_cur > linux32_maxvmem) 991 rl->rlim_cur = linux32_maxvmem; 992 if (rl->rlim_max > linux32_maxvmem) 993 rl->rlim_max = linux32_maxvmem; 994 } 995 break; 996 } 997 } 998 999 struct sysentvec elf_linux_sysvec = { 1000 .sv_size = LINUX_SYS_MAXSYSCALL, 1001 .sv_table = linux_sysent, 1002 .sv_mask = 0, 1003 .sv_sigsize = LINUX_SIGTBLSZ, 1004 .sv_sigtbl = bsd_to_linux_signal, 1005 .sv_errsize = ELAST + 1, 1006 .sv_errtbl = bsd_to_linux_errno, 1007 .sv_transtrap = translate_traps, 1008 .sv_fixup = elf_linux_fixup, 1009 .sv_sendsig = linux_sendsig, 1010 .sv_sigcode = linux_sigcode, 1011 .sv_szsigcode = &linux_szsigcode, 1012 .sv_prepsyscall = linux_prepsyscall, 1013 .sv_name = "Linux ELF32", 1014 .sv_coredump = elf32_coredump, 1015 .sv_imgact_try = exec_linux_imgact_try, 1016 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1017 .sv_pagesize = PAGE_SIZE, 1018 .sv_minuser = VM_MIN_ADDRESS, 1019 .sv_maxuser = LINUX32_USRSTACK, 1020 .sv_usrstack = LINUX32_USRSTACK, 1021 .sv_psstrings = LINUX32_PS_STRINGS, 1022 .sv_stackprot = VM_PROT_ALL, 1023 .sv_copyout_strings = linux_copyout_strings, 1024 .sv_setregs = exec_linux_setregs, 1025 .sv_fixlimit = linux32_fixlimit, 1026 .sv_maxssiz = &linux32_maxssiz, 1027 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 1028 }; 1029 1030 static Elf32_Brandinfo linux_brand = { 1031 .brand = ELFOSABI_LINUX, 1032 .machine = EM_386, 1033 .compat_3_brand = "Linux", 1034 .emul_path = "/compat/linux", 1035 .interp_path = "/lib/ld-linux.so.1", 1036 .sysvec = &elf_linux_sysvec, 1037 .interp_newpath = NULL, 1038 .flags = BI_CAN_EXEC_DYN, 1039 }; 1040 1041 static Elf32_Brandinfo linux_glibc2brand = { 1042 .brand = ELFOSABI_LINUX, 1043 .machine = EM_386, 1044 .compat_3_brand = "Linux", 1045 .emul_path = "/compat/linux", 1046 .interp_path = "/lib/ld-linux.so.2", 1047 .sysvec = &elf_linux_sysvec, 1048 .interp_newpath = NULL, 1049 .flags = BI_CAN_EXEC_DYN, 1050 }; 1051 1052 Elf32_Brandinfo *linux_brandlist[] = { 1053 &linux_brand, 1054 &linux_glibc2brand, 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 struct linux_device_handler **ldhp; 1065 1066 error = 0; 1067 1068 switch(type) { 1069 case MOD_LOAD: 1070 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1071 ++brandinfo) 1072 if (elf32_insert_brand_entry(*brandinfo) < 0) 1073 error = EINVAL; 1074 if (error == 0) { 1075 SET_FOREACH(lihp, linux_ioctl_handler_set) 1076 linux_ioctl_register_handler(*lihp); 1077 SET_FOREACH(ldhp, linux_device_handler_set) 1078 linux_device_register_handler(*ldhp); 1079 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1080 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1081 LIST_INIT(&futex_list); 1082 sx_init(&futex_sx, "futex protection lock"); 1083 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1084 NULL, 1000); 1085 linux_schedtail_tag = EVENTHANDLER_REGISTER(schedtail, linux_schedtail, 1086 NULL, 1000); 1087 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1088 NULL, 1000); 1089 if (bootverbose) 1090 printf("Linux ELF exec handler installed\n"); 1091 } else 1092 printf("cannot insert Linux ELF brand handler\n"); 1093 break; 1094 case MOD_UNLOAD: 1095 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1096 ++brandinfo) 1097 if (elf32_brand_inuse(*brandinfo)) 1098 error = EBUSY; 1099 if (error == 0) { 1100 for (brandinfo = &linux_brandlist[0]; 1101 *brandinfo != NULL; ++brandinfo) 1102 if (elf32_remove_brand_entry(*brandinfo) < 0) 1103 error = EINVAL; 1104 } 1105 if (error == 0) { 1106 SET_FOREACH(lihp, linux_ioctl_handler_set) 1107 linux_ioctl_unregister_handler(*lihp); 1108 SET_FOREACH(ldhp, linux_device_handler_set) 1109 linux_device_unregister_handler(*ldhp); 1110 mtx_destroy(&emul_lock); 1111 sx_destroy(&emul_shared_lock); 1112 sx_destroy(&futex_sx); 1113 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1114 EVENTHANDLER_DEREGISTER(schedtail, linux_schedtail_tag); 1115 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1116 if (bootverbose) 1117 printf("Linux ELF exec handler removed\n"); 1118 } else 1119 printf("Could not deinstall ELF interpreter entry\n"); 1120 break; 1121 default: 1122 return EOPNOTSUPP; 1123 } 1124 return error; 1125 } 1126 1127 static moduledata_t linux_elf_mod = { 1128 "linuxelf", 1129 linux_elf_modevent, 1130 0 1131 }; 1132 1133 DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1134