Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux_sysvec.c
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1 /*- 2 * Copyright (c) 1994-1996 Søren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/8.1/sys/i386/linux/linux_sysvec.c 200722 2009-12-19 11:31:28Z kib $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/exec.h> 35 #include <sys/fcntl.h> 36 #include <sys/imgact.h> 37 #include <sys/imgact_aout.h> 38 #include <sys/imgact_elf.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/module.h> 43 #include <sys/mutex.h> 44 #include <sys/proc.h> 45 #include <sys/signalvar.h> 46 #include <sys/syscallsubr.h> 47 #include <sys/sysent.h> 48 #include <sys/sysproto.h> 49 #include <sys/vnode.h> 50 #include <sys/eventhandler.h> 51 52 #include <vm/vm.h> 53 #include <vm/pmap.h> 54 #include <vm/vm_extern.h> 55 #include <vm/vm_map.h> 56 #include <vm/vm_object.h> 57 #include <vm/vm_page.h> 58 #include <vm/vm_param.h> 59 60 #include <machine/cpu.h> 61 #include <machine/cputypes.h> 62 #include <machine/md_var.h> 63 #include <machine/pcb.h> 64 65 #include <i386/linux/linux.h> 66 #include <i386/linux/linux_proto.h> 67 #include <compat/linux/linux_futex.h> 68 #include <compat/linux/linux_emul.h> 69 #include <compat/linux/linux_mib.h> 70 #include <compat/linux/linux_misc.h> 71 #include <compat/linux/linux_signal.h> 72 #include <compat/linux/linux_util.h> 73 74 MODULE_VERSION(linux, 1); 75 76 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 77 78 #if BYTE_ORDER == LITTLE_ENDIAN 79 #define SHELLMAGIC 0x2123 /* #! */ 80 #else 81 #define SHELLMAGIC 0x2321 82 #endif 83 84 /* 85 * Allow the sendsig functions to use the ldebug() facility 86 * even though they are not syscalls themselves. Map them 87 * to syscall 0. This is slightly less bogus than using 88 * ldebug(sigreturn). 89 */ 90 #define LINUX_SYS_linux_rt_sendsig 0 91 #define LINUX_SYS_linux_sendsig 0 92 93 extern char linux_sigcode[]; 94 extern int linux_szsigcode; 95 96 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 97 98 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 99 SET_DECLARE(linux_device_handler_set, struct linux_device_handler); 100 101 static int linux_fixup(register_t **stack_base, 102 struct image_params *iparams); 103 static int elf_linux_fixup(register_t **stack_base, 104 struct image_params *iparams); 105 static void linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, 106 caddr_t *params); 107 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 108 static void exec_linux_setregs(struct thread *td, u_long entry, 109 u_long stack, u_long ps_strings); 110 static register_t *linux_copyout_strings(struct image_params *imgp); 111 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 112 113 static int linux_szplatform; 114 const char *linux_platform; 115 116 static eventhandler_tag linux_exit_tag; 117 static eventhandler_tag linux_schedtail_tag; 118 static eventhandler_tag linux_exec_tag; 119 120 /* 121 * Linux syscalls return negative errno's, we do positive and map them 122 * Reference: 123 * FreeBSD: src/sys/sys/errno.h 124 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 125 * linux-2.6.17.8/include/asm-generic/errno.h 126 */ 127 static int bsd_to_linux_errno[ELAST + 1] = { 128 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 129 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 130 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 131 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 132 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 133 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 134 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 135 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 136 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 137 -72, -67, -71 138 }; 139 140 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 141 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 142 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 143 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 144 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 145 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 146 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 147 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 148 0, LINUX_SIGUSR1, LINUX_SIGUSR2 149 }; 150 151 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 152 SIGHUP, SIGINT, SIGQUIT, SIGILL, 153 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 154 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 155 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 156 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 157 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 158 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 159 SIGIO, SIGURG, SIGSYS 160 }; 161 162 #define LINUX_T_UNKNOWN 255 163 static int _bsd_to_linux_trapcode[] = { 164 LINUX_T_UNKNOWN, /* 0 */ 165 6, /* 1 T_PRIVINFLT */ 166 LINUX_T_UNKNOWN, /* 2 */ 167 3, /* 3 T_BPTFLT */ 168 LINUX_T_UNKNOWN, /* 4 */ 169 LINUX_T_UNKNOWN, /* 5 */ 170 16, /* 6 T_ARITHTRAP */ 171 254, /* 7 T_ASTFLT */ 172 LINUX_T_UNKNOWN, /* 8 */ 173 13, /* 9 T_PROTFLT */ 174 1, /* 10 T_TRCTRAP */ 175 LINUX_T_UNKNOWN, /* 11 */ 176 14, /* 12 T_PAGEFLT */ 177 LINUX_T_UNKNOWN, /* 13 */ 178 17, /* 14 T_ALIGNFLT */ 179 LINUX_T_UNKNOWN, /* 15 */ 180 LINUX_T_UNKNOWN, /* 16 */ 181 LINUX_T_UNKNOWN, /* 17 */ 182 0, /* 18 T_DIVIDE */ 183 2, /* 19 T_NMI */ 184 4, /* 20 T_OFLOW */ 185 5, /* 21 T_BOUND */ 186 7, /* 22 T_DNA */ 187 8, /* 23 T_DOUBLEFLT */ 188 9, /* 24 T_FPOPFLT */ 189 10, /* 25 T_TSSFLT */ 190 11, /* 26 T_SEGNPFLT */ 191 12, /* 27 T_STKFLT */ 192 18, /* 28 T_MCHK */ 193 19, /* 29 T_XMMFLT */ 194 15 /* 30 T_RESERVED */ 195 }; 196 #define bsd_to_linux_trapcode(code) \ 197 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 198 _bsd_to_linux_trapcode[(code)]: \ 199 LINUX_T_UNKNOWN) 200 201 /* 202 * If FreeBSD & Linux have a difference of opinion about what a trap 203 * means, deal with it here. 204 * 205 * MPSAFE 206 */ 207 static int 208 translate_traps(int signal, int trap_code) 209 { 210 if (signal != SIGBUS) 211 return signal; 212 switch (trap_code) { 213 case T_PROTFLT: 214 case T_TSSFLT: 215 case T_DOUBLEFLT: 216 case T_PAGEFLT: 217 return SIGSEGV; 218 default: 219 return signal; 220 } 221 } 222 223 static int 224 linux_fixup(register_t **stack_base, struct image_params *imgp) 225 { 226 register_t *argv, *envp; 227 228 argv = *stack_base; 229 envp = *stack_base + (imgp->args->argc + 1); 230 (*stack_base)--; 231 **stack_base = (intptr_t)(void *)envp; 232 (*stack_base)--; 233 **stack_base = (intptr_t)(void *)argv; 234 (*stack_base)--; 235 **stack_base = imgp->args->argc; 236 return (0); 237 } 238 239 static int 240 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 241 { 242 struct proc *p; 243 Elf32_Auxargs *args; 244 Elf32_Addr *uplatform; 245 struct ps_strings *arginfo; 246 register_t *pos; 247 248 KASSERT(curthread->td_proc == imgp->proc, 249 ("unsafe elf_linux_fixup(), should be curproc")); 250 251 p = imgp->proc; 252 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 253 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szsigcode - 254 linux_szplatform); 255 args = (Elf32_Auxargs *)imgp->auxargs; 256 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 257 258 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 259 260 /* 261 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 262 * as it has appeared in the 2.4.0-rc7 first time. 263 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 264 * glibc falls back to the hard-coded CLK_TCK value when aux entry 265 * is not present. 266 * Also see linux_times() implementation. 267 */ 268 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 269 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 270 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 271 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 272 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 273 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 274 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 275 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 276 AUXARGS_ENTRY(pos, AT_BASE, args->base); 277 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, 0); 278 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 279 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 280 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 281 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 282 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 283 if (args->execfd != -1) 284 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 285 AUXARGS_ENTRY(pos, AT_NULL, 0); 286 287 free(imgp->auxargs, M_TEMP); 288 imgp->auxargs = NULL; 289 290 (*stack_base)--; 291 **stack_base = (register_t)imgp->args->argc; 292 return (0); 293 } 294 295 /* 296 * Copied from kern/kern_exec.c 297 */ 298 static register_t * 299 linux_copyout_strings(struct image_params *imgp) 300 { 301 int argc, envc; 302 char **vectp; 303 char *stringp, *destp; 304 register_t *stack_base; 305 struct ps_strings *arginfo; 306 struct proc *p; 307 308 /* 309 * Calculate string base and vector table pointers. 310 * Also deal with signal trampoline code for this exec type. 311 */ 312 p = imgp->proc; 313 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 314 destp = (caddr_t)arginfo - linux_szsigcode - SPARE_USRSPACE - 315 linux_szplatform - roundup((ARG_MAX - imgp->args->stringspace), 316 sizeof(char *)); 317 318 /* 319 * install sigcode 320 */ 321 copyout(p->p_sysent->sv_sigcode, ((caddr_t)arginfo - 322 linux_szsigcode), linux_szsigcode); 323 324 /* 325 * install LINUX_PLATFORM 326 */ 327 copyout(linux_platform, ((caddr_t)arginfo - linux_szsigcode - 328 linux_szplatform), linux_szplatform); 329 330 /* 331 * If we have a valid auxargs ptr, prepare some room 332 * on the stack. 333 */ 334 if (imgp->auxargs) { 335 /* 336 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 337 * lower compatibility. 338 */ 339 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 340 (LINUX_AT_COUNT * 2); 341 /* 342 * The '+ 2' is for the null pointers at the end of each of 343 * the arg and env vector sets,and imgp->auxarg_size is room 344 * for argument of Runtime loader. 345 */ 346 vectp = (char **)(destp - (imgp->args->argc + 347 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 348 } else { 349 /* 350 * The '+ 2' is for the null pointers at the end of each of 351 * the arg and env vector sets 352 */ 353 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 354 sizeof(char *)); 355 } 356 357 /* 358 * vectp also becomes our initial stack base 359 */ 360 stack_base = (register_t *)vectp; 361 362 stringp = imgp->args->begin_argv; 363 argc = imgp->args->argc; 364 envc = imgp->args->envc; 365 366 /* 367 * Copy out strings - arguments and environment. 368 */ 369 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 370 371 /* 372 * Fill in "ps_strings" struct for ps, w, etc. 373 */ 374 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 375 suword(&arginfo->ps_nargvstr, argc); 376 377 /* 378 * Fill in argument portion of vector table. 379 */ 380 for (; argc > 0; --argc) { 381 suword(vectp++, (long)(intptr_t)destp); 382 while (*stringp++ != 0) 383 destp++; 384 destp++; 385 } 386 387 /* a null vector table pointer separates the argp's from the envp's */ 388 suword(vectp++, 0); 389 390 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 391 suword(&arginfo->ps_nenvstr, envc); 392 393 /* 394 * Fill in environment portion of vector table. 395 */ 396 for (; envc > 0; --envc) { 397 suword(vectp++, (long)(intptr_t)destp); 398 while (*stringp++ != 0) 399 destp++; 400 destp++; 401 } 402 403 /* end of vector table is a null pointer */ 404 suword(vectp, 0); 405 406 return (stack_base); 407 } 408 409 410 411 extern int _ucodesel, _udatasel; 412 extern unsigned long linux_sznonrtsigcode; 413 414 static void 415 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 416 { 417 struct thread *td = curthread; 418 struct proc *p = td->td_proc; 419 struct sigacts *psp; 420 struct trapframe *regs; 421 struct l_rt_sigframe *fp, frame; 422 int sig, code; 423 int oonstack; 424 425 sig = ksi->ksi_signo; 426 code = ksi->ksi_code; 427 PROC_LOCK_ASSERT(p, MA_OWNED); 428 psp = p->p_sigacts; 429 mtx_assert(&psp->ps_mtx, MA_OWNED); 430 regs = td->td_frame; 431 oonstack = sigonstack(regs->tf_esp); 432 433 #ifdef DEBUG 434 if (ldebug(rt_sendsig)) 435 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 436 catcher, sig, (void*)mask, code); 437 #endif 438 /* 439 * Allocate space for the signal handler context. 440 */ 441 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 442 SIGISMEMBER(psp->ps_sigonstack, sig)) { 443 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 444 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 445 } else 446 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 447 mtx_unlock(&psp->ps_mtx); 448 449 /* 450 * Build the argument list for the signal handler. 451 */ 452 if (p->p_sysent->sv_sigtbl) 453 if (sig <= p->p_sysent->sv_sigsize) 454 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 455 456 bzero(&frame, sizeof(frame)); 457 458 frame.sf_handler = catcher; 459 frame.sf_sig = sig; 460 frame.sf_siginfo = &fp->sf_si; 461 frame.sf_ucontext = &fp->sf_sc; 462 463 /* Fill in POSIX parts */ 464 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 465 466 /* 467 * Build the signal context to be used by sigreturn. 468 */ 469 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 470 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 471 472 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 473 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 474 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 475 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 476 PROC_UNLOCK(p); 477 478 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 479 480 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 481 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 482 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 483 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 484 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 485 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 486 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 487 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 488 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 489 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 490 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 491 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 492 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 493 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 494 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 495 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 496 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 497 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 498 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 499 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 500 501 #ifdef DEBUG 502 if (ldebug(rt_sendsig)) 503 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 504 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 505 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 506 #endif 507 508 if (copyout(&frame, fp, sizeof(frame)) != 0) { 509 /* 510 * Process has trashed its stack; give it an illegal 511 * instruction to halt it in its tracks. 512 */ 513 #ifdef DEBUG 514 if (ldebug(rt_sendsig)) 515 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 516 fp, oonstack); 517 #endif 518 PROC_LOCK(p); 519 sigexit(td, SIGILL); 520 } 521 522 /* 523 * Build context to run handler in. 524 */ 525 regs->tf_esp = (int)fp; 526 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode) + 527 linux_sznonrtsigcode; 528 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 529 regs->tf_cs = _ucodesel; 530 regs->tf_ds = _udatasel; 531 regs->tf_es = _udatasel; 532 regs->tf_fs = _udatasel; 533 regs->tf_ss = _udatasel; 534 PROC_LOCK(p); 535 mtx_lock(&psp->ps_mtx); 536 } 537 538 539 /* 540 * Send an interrupt to process. 541 * 542 * Stack is set up to allow sigcode stored 543 * in u. to call routine, followed by kcall 544 * to sigreturn routine below. After sigreturn 545 * resets the signal mask, the stack, and the 546 * frame pointer, it returns to the user 547 * specified pc, psl. 548 */ 549 static void 550 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 551 { 552 struct thread *td = curthread; 553 struct proc *p = td->td_proc; 554 struct sigacts *psp; 555 struct trapframe *regs; 556 struct l_sigframe *fp, frame; 557 l_sigset_t lmask; 558 int sig, code; 559 int oonstack, i; 560 561 PROC_LOCK_ASSERT(p, MA_OWNED); 562 psp = p->p_sigacts; 563 sig = ksi->ksi_signo; 564 code = ksi->ksi_code; 565 mtx_assert(&psp->ps_mtx, MA_OWNED); 566 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 567 /* Signal handler installed with SA_SIGINFO. */ 568 linux_rt_sendsig(catcher, ksi, mask); 569 return; 570 } 571 regs = td->td_frame; 572 oonstack = sigonstack(regs->tf_esp); 573 574 #ifdef DEBUG 575 if (ldebug(sendsig)) 576 printf(ARGS(sendsig, "%p, %d, %p, %u"), 577 catcher, sig, (void*)mask, code); 578 #endif 579 580 /* 581 * Allocate space for the signal handler context. 582 */ 583 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 584 SIGISMEMBER(psp->ps_sigonstack, sig)) { 585 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 586 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 587 } else 588 fp = (struct l_sigframe *)regs->tf_esp - 1; 589 mtx_unlock(&psp->ps_mtx); 590 PROC_UNLOCK(p); 591 592 /* 593 * Build the argument list for the signal handler. 594 */ 595 if (p->p_sysent->sv_sigtbl) 596 if (sig <= p->p_sysent->sv_sigsize) 597 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 598 599 bzero(&frame, sizeof(frame)); 600 601 frame.sf_handler = catcher; 602 frame.sf_sig = sig; 603 604 bsd_to_linux_sigset(mask, &lmask); 605 606 /* 607 * Build the signal context to be used by sigreturn. 608 */ 609 frame.sf_sc.sc_mask = lmask.__bits[0]; 610 frame.sf_sc.sc_gs = rgs(); 611 frame.sf_sc.sc_fs = regs->tf_fs; 612 frame.sf_sc.sc_es = regs->tf_es; 613 frame.sf_sc.sc_ds = regs->tf_ds; 614 frame.sf_sc.sc_edi = regs->tf_edi; 615 frame.sf_sc.sc_esi = regs->tf_esi; 616 frame.sf_sc.sc_ebp = regs->tf_ebp; 617 frame.sf_sc.sc_ebx = regs->tf_ebx; 618 frame.sf_sc.sc_edx = regs->tf_edx; 619 frame.sf_sc.sc_ecx = regs->tf_ecx; 620 frame.sf_sc.sc_eax = regs->tf_eax; 621 frame.sf_sc.sc_eip = regs->tf_eip; 622 frame.sf_sc.sc_cs = regs->tf_cs; 623 frame.sf_sc.sc_eflags = regs->tf_eflags; 624 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 625 frame.sf_sc.sc_ss = regs->tf_ss; 626 frame.sf_sc.sc_err = regs->tf_err; 627 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 628 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 629 630 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 631 frame.sf_extramask[i] = lmask.__bits[i+1]; 632 633 if (copyout(&frame, fp, sizeof(frame)) != 0) { 634 /* 635 * Process has trashed its stack; give it an illegal 636 * instruction to halt it in its tracks. 637 */ 638 PROC_LOCK(p); 639 sigexit(td, SIGILL); 640 } 641 642 /* 643 * Build context to run handler in. 644 */ 645 regs->tf_esp = (int)fp; 646 regs->tf_eip = PS_STRINGS - *(p->p_sysent->sv_szsigcode); 647 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 648 regs->tf_cs = _ucodesel; 649 regs->tf_ds = _udatasel; 650 regs->tf_es = _udatasel; 651 regs->tf_fs = _udatasel; 652 regs->tf_ss = _udatasel; 653 PROC_LOCK(p); 654 mtx_lock(&psp->ps_mtx); 655 } 656 657 /* 658 * System call to cleanup state after a signal 659 * has been taken. Reset signal mask and 660 * stack state from context left by sendsig (above). 661 * Return to previous pc and psl as specified by 662 * context left by sendsig. Check carefully to 663 * make sure that the user has not modified the 664 * psl to gain improper privileges or to cause 665 * a machine fault. 666 */ 667 int 668 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 669 { 670 struct l_sigframe frame; 671 struct trapframe *regs; 672 l_sigset_t lmask; 673 sigset_t bmask; 674 int eflags, i; 675 ksiginfo_t ksi; 676 677 regs = td->td_frame; 678 679 #ifdef DEBUG 680 if (ldebug(sigreturn)) 681 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 682 #endif 683 /* 684 * The trampoline code hands us the sigframe. 685 * It is unsafe to keep track of it ourselves, in the event that a 686 * program jumps out of a signal handler. 687 */ 688 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 689 return (EFAULT); 690 691 /* 692 * Check for security violations. 693 */ 694 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 695 eflags = frame.sf_sc.sc_eflags; 696 /* 697 * XXX do allow users to change the privileged flag PSL_RF. The 698 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 699 * sometimes set it there too. tf_eflags is kept in the signal 700 * context during signal handling and there is no other place 701 * to remember it, so the PSL_RF bit may be corrupted by the 702 * signal handler without us knowing. Corruption of the PSL_RF 703 * bit at worst causes one more or one less debugger trap, so 704 * allowing it is fairly harmless. 705 */ 706 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) 707 return(EINVAL); 708 709 /* 710 * Don't allow users to load a valid privileged %cs. Let the 711 * hardware check for invalid selectors, excess privilege in 712 * other selectors, invalid %eip's and invalid %esp's. 713 */ 714 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 715 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 716 ksiginfo_init_trap(&ksi); 717 ksi.ksi_signo = SIGBUS; 718 ksi.ksi_code = BUS_OBJERR; 719 ksi.ksi_trapno = T_PROTFLT; 720 ksi.ksi_addr = (void *)regs->tf_eip; 721 trapsignal(td, &ksi); 722 return(EINVAL); 723 } 724 725 lmask.__bits[0] = frame.sf_sc.sc_mask; 726 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 727 lmask.__bits[i+1] = frame.sf_extramask[i]; 728 linux_to_bsd_sigset(&lmask, &bmask); 729 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 730 731 /* 732 * Restore signal context. 733 */ 734 /* %gs was restored by the trampoline. */ 735 regs->tf_fs = frame.sf_sc.sc_fs; 736 regs->tf_es = frame.sf_sc.sc_es; 737 regs->tf_ds = frame.sf_sc.sc_ds; 738 regs->tf_edi = frame.sf_sc.sc_edi; 739 regs->tf_esi = frame.sf_sc.sc_esi; 740 regs->tf_ebp = frame.sf_sc.sc_ebp; 741 regs->tf_ebx = frame.sf_sc.sc_ebx; 742 regs->tf_edx = frame.sf_sc.sc_edx; 743 regs->tf_ecx = frame.sf_sc.sc_ecx; 744 regs->tf_eax = frame.sf_sc.sc_eax; 745 regs->tf_eip = frame.sf_sc.sc_eip; 746 regs->tf_cs = frame.sf_sc.sc_cs; 747 regs->tf_eflags = eflags; 748 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 749 regs->tf_ss = frame.sf_sc.sc_ss; 750 751 return (EJUSTRETURN); 752 } 753 754 /* 755 * System call to cleanup state after a signal 756 * has been taken. Reset signal mask and 757 * stack state from context left by rt_sendsig (above). 758 * Return to previous pc and psl as specified by 759 * context left by sendsig. Check carefully to 760 * make sure that the user has not modified the 761 * psl to gain improper privileges or to cause 762 * a machine fault. 763 */ 764 int 765 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 766 { 767 struct l_ucontext uc; 768 struct l_sigcontext *context; 769 sigset_t bmask; 770 l_stack_t *lss; 771 stack_t ss; 772 struct trapframe *regs; 773 int eflags; 774 ksiginfo_t ksi; 775 776 regs = td->td_frame; 777 778 #ifdef DEBUG 779 if (ldebug(rt_sigreturn)) 780 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 781 #endif 782 /* 783 * The trampoline code hands us the ucontext. 784 * It is unsafe to keep track of it ourselves, in the event that a 785 * program jumps out of a signal handler. 786 */ 787 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 788 return (EFAULT); 789 790 context = &uc.uc_mcontext; 791 792 /* 793 * Check for security violations. 794 */ 795 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 796 eflags = context->sc_eflags; 797 /* 798 * XXX do allow users to change the privileged flag PSL_RF. The 799 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 800 * sometimes set it there too. tf_eflags is kept in the signal 801 * context during signal handling and there is no other place 802 * to remember it, so the PSL_RF bit may be corrupted by the 803 * signal handler without us knowing. Corruption of the PSL_RF 804 * bit at worst causes one more or one less debugger trap, so 805 * allowing it is fairly harmless. 806 */ 807 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_eflags & ~PSL_RF)) 808 return(EINVAL); 809 810 /* 811 * Don't allow users to load a valid privileged %cs. Let the 812 * hardware check for invalid selectors, excess privilege in 813 * other selectors, invalid %eip's and invalid %esp's. 814 */ 815 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 816 if (!CS_SECURE(context->sc_cs)) { 817 ksiginfo_init_trap(&ksi); 818 ksi.ksi_signo = SIGBUS; 819 ksi.ksi_code = BUS_OBJERR; 820 ksi.ksi_trapno = T_PROTFLT; 821 ksi.ksi_addr = (void *)regs->tf_eip; 822 trapsignal(td, &ksi); 823 return(EINVAL); 824 } 825 826 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 827 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 828 829 /* 830 * Restore signal context 831 */ 832 /* %gs was restored by the trampoline. */ 833 regs->tf_fs = context->sc_fs; 834 regs->tf_es = context->sc_es; 835 regs->tf_ds = context->sc_ds; 836 regs->tf_edi = context->sc_edi; 837 regs->tf_esi = context->sc_esi; 838 regs->tf_ebp = context->sc_ebp; 839 regs->tf_ebx = context->sc_ebx; 840 regs->tf_edx = context->sc_edx; 841 regs->tf_ecx = context->sc_ecx; 842 regs->tf_eax = context->sc_eax; 843 regs->tf_eip = context->sc_eip; 844 regs->tf_cs = context->sc_cs; 845 regs->tf_eflags = eflags; 846 regs->tf_esp = context->sc_esp_at_signal; 847 regs->tf_ss = context->sc_ss; 848 849 /* 850 * call sigaltstack & ignore results.. 851 */ 852 lss = &uc.uc_stack; 853 ss.ss_sp = lss->ss_sp; 854 ss.ss_size = lss->ss_size; 855 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 856 857 #ifdef DEBUG 858 if (ldebug(rt_sigreturn)) 859 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 860 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 861 #endif 862 (void)kern_sigaltstack(td, &ss, NULL); 863 864 return (EJUSTRETURN); 865 } 866 867 /* 868 * MPSAFE 869 */ 870 static void 871 linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, caddr_t *params) 872 { 873 args[0] = tf->tf_ebx; 874 args[1] = tf->tf_ecx; 875 args[2] = tf->tf_edx; 876 args[3] = tf->tf_esi; 877 args[4] = tf->tf_edi; 878 args[5] = tf->tf_ebp; /* Unconfirmed */ 879 *params = NULL; /* no copyin */ 880 } 881 882 /* 883 * If a linux binary is exec'ing something, try this image activator 884 * first. We override standard shell script execution in order to 885 * be able to modify the interpreter path. We only do this if a linux 886 * binary is doing the exec, so we do not create an EXEC module for it. 887 */ 888 static int exec_linux_imgact_try(struct image_params *iparams); 889 890 static int 891 exec_linux_imgact_try(struct image_params *imgp) 892 { 893 const char *head = (const char *)imgp->image_header; 894 char *rpath; 895 int error = -1, len; 896 897 /* 898 * The interpreter for shell scripts run from a linux binary needs 899 * to be located in /compat/linux if possible in order to recursively 900 * maintain linux path emulation. 901 */ 902 if (((const short *)head)[0] == SHELLMAGIC) { 903 /* 904 * Run our normal shell image activator. If it succeeds attempt 905 * to use the alternate path for the interpreter. If an alternate 906 * path is found, use our stringspace to store it. 907 */ 908 if ((error = exec_shell_imgact(imgp)) == 0) { 909 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 910 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 911 if (rpath != NULL) { 912 len = strlen(rpath) + 1; 913 914 if (len <= MAXSHELLCMDLEN) { 915 memcpy(imgp->interpreter_name, rpath, len); 916 } 917 free(rpath, M_TEMP); 918 } 919 } 920 } 921 return(error); 922 } 923 924 /* 925 * exec_setregs may initialize some registers differently than Linux 926 * does, thus potentially confusing Linux binaries. If necessary, we 927 * override the exec_setregs default(s) here. 928 */ 929 static void 930 exec_linux_setregs(struct thread *td, u_long entry, 931 u_long stack, u_long ps_strings) 932 { 933 struct pcb *pcb = td->td_pcb; 934 935 exec_setregs(td, entry, stack, ps_strings); 936 937 /* Linux sets %gs to 0, we default to _udatasel */ 938 pcb->pcb_gs = 0; 939 load_gs(0); 940 941 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 942 } 943 944 static void 945 linux_get_machine(const char **dst) 946 { 947 948 switch (cpu_class) { 949 case CPUCLASS_686: 950 *dst = "i686"; 951 break; 952 case CPUCLASS_586: 953 *dst = "i586"; 954 break; 955 case CPUCLASS_486: 956 *dst = "i486"; 957 break; 958 default: 959 *dst = "i386"; 960 } 961 } 962 963 struct sysentvec linux_sysvec = { 964 .sv_size = LINUX_SYS_MAXSYSCALL, 965 .sv_table = linux_sysent, 966 .sv_mask = 0, 967 .sv_sigsize = LINUX_SIGTBLSZ, 968 .sv_sigtbl = bsd_to_linux_signal, 969 .sv_errsize = ELAST + 1, 970 .sv_errtbl = bsd_to_linux_errno, 971 .sv_transtrap = translate_traps, 972 .sv_fixup = linux_fixup, 973 .sv_sendsig = linux_sendsig, 974 .sv_sigcode = linux_sigcode, 975 .sv_szsigcode = &linux_szsigcode, 976 .sv_prepsyscall = linux_prepsyscall, 977 .sv_name = "Linux a.out", 978 .sv_coredump = NULL, 979 .sv_imgact_try = exec_linux_imgact_try, 980 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 981 .sv_pagesize = PAGE_SIZE, 982 .sv_minuser = VM_MIN_ADDRESS, 983 .sv_maxuser = VM_MAXUSER_ADDRESS, 984 .sv_usrstack = USRSTACK, 985 .sv_psstrings = PS_STRINGS, 986 .sv_stackprot = VM_PROT_ALL, 987 .sv_copyout_strings = exec_copyout_strings, 988 .sv_setregs = exec_linux_setregs, 989 .sv_fixlimit = NULL, 990 .sv_maxssiz = NULL, 991 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 992 }; 993 994 struct sysentvec elf_linux_sysvec = { 995 .sv_size = LINUX_SYS_MAXSYSCALL, 996 .sv_table = linux_sysent, 997 .sv_mask = 0, 998 .sv_sigsize = LINUX_SIGTBLSZ, 999 .sv_sigtbl = bsd_to_linux_signal, 1000 .sv_errsize = ELAST + 1, 1001 .sv_errtbl = bsd_to_linux_errno, 1002 .sv_transtrap = translate_traps, 1003 .sv_fixup = elf_linux_fixup, 1004 .sv_sendsig = linux_sendsig, 1005 .sv_sigcode = linux_sigcode, 1006 .sv_szsigcode = &linux_szsigcode, 1007 .sv_prepsyscall = linux_prepsyscall, 1008 .sv_name = "Linux ELF", 1009 .sv_coredump = elf32_coredump, 1010 .sv_imgact_try = exec_linux_imgact_try, 1011 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1012 .sv_pagesize = PAGE_SIZE, 1013 .sv_minuser = VM_MIN_ADDRESS, 1014 .sv_maxuser = VM_MAXUSER_ADDRESS, 1015 .sv_usrstack = USRSTACK, 1016 .sv_psstrings = PS_STRINGS, 1017 .sv_stackprot = VM_PROT_ALL, 1018 .sv_copyout_strings = linux_copyout_strings, 1019 .sv_setregs = exec_linux_setregs, 1020 .sv_fixlimit = NULL, 1021 .sv_maxssiz = NULL, 1022 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 1023 }; 1024 1025 static char GNU_ABI_VENDOR[] = "GNU"; 1026 static int GNULINUX_ABI_DESC = 0; 1027 1028 static boolean_t 1029 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1030 { 1031 const Elf32_Word *desc; 1032 uintptr_t p; 1033 1034 p = (uintptr_t)(note + 1); 1035 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1036 1037 desc = (const Elf32_Word *)p; 1038 if (desc[0] != GNULINUX_ABI_DESC) 1039 return (FALSE); 1040 1041 /* 1042 * For linux we encode osrel as follows (see linux_mib.c): 1043 * VVVMMMIII (version, major, minor), see linux_mib.c. 1044 */ 1045 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1046 1047 return (TRUE); 1048 } 1049 1050 static Elf_Brandnote linux_brandnote = { 1051 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1052 .hdr.n_descsz = 16, /* XXX at least 16 */ 1053 .hdr.n_type = 1, 1054 .vendor = GNU_ABI_VENDOR, 1055 .flags = BN_TRANSLATE_OSREL, 1056 .trans_osrel = linux_trans_osrel 1057 }; 1058 1059 static Elf32_Brandinfo linux_brand = { 1060 .brand = ELFOSABI_LINUX, 1061 .machine = EM_386, 1062 .compat_3_brand = "Linux", 1063 .emul_path = "/compat/linux", 1064 .interp_path = "/lib/ld-linux.so.1", 1065 .sysvec = &elf_linux_sysvec, 1066 .interp_newpath = NULL, 1067 .brand_note = &linux_brandnote, 1068 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1069 }; 1070 1071 static Elf32_Brandinfo linux_glibc2brand = { 1072 .brand = ELFOSABI_LINUX, 1073 .machine = EM_386, 1074 .compat_3_brand = "Linux", 1075 .emul_path = "/compat/linux", 1076 .interp_path = "/lib/ld-linux.so.2", 1077 .sysvec = &elf_linux_sysvec, 1078 .interp_newpath = NULL, 1079 .brand_note = &linux_brandnote, 1080 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1081 }; 1082 1083 Elf32_Brandinfo *linux_brandlist[] = { 1084 &linux_brand, 1085 &linux_glibc2brand, 1086 NULL 1087 }; 1088 1089 static int 1090 linux_elf_modevent(module_t mod, int type, void *data) 1091 { 1092 Elf32_Brandinfo **brandinfo; 1093 int error; 1094 struct linux_ioctl_handler **lihp; 1095 struct linux_device_handler **ldhp; 1096 1097 error = 0; 1098 1099 switch(type) { 1100 case MOD_LOAD: 1101 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1102 ++brandinfo) 1103 if (elf32_insert_brand_entry(*brandinfo) < 0) 1104 error = EINVAL; 1105 if (error == 0) { 1106 SET_FOREACH(lihp, linux_ioctl_handler_set) 1107 linux_ioctl_register_handler(*lihp); 1108 SET_FOREACH(ldhp, linux_device_handler_set) 1109 linux_device_register_handler(*ldhp); 1110 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1111 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1112 LIST_INIT(&futex_list); 1113 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1114 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1115 NULL, 1000); 1116 linux_schedtail_tag = EVENTHANDLER_REGISTER(schedtail, linux_schedtail, 1117 NULL, 1000); 1118 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1119 NULL, 1000); 1120 linux_get_machine(&linux_platform); 1121 linux_szplatform = roundup(strlen(linux_platform) + 1, 1122 sizeof(char *)); 1123 linux_osd_jail_register(); 1124 stclohz = (stathz ? stathz : hz); 1125 if (bootverbose) 1126 printf("Linux ELF exec handler installed\n"); 1127 } else 1128 printf("cannot insert Linux ELF brand handler\n"); 1129 break; 1130 case MOD_UNLOAD: 1131 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1132 ++brandinfo) 1133 if (elf32_brand_inuse(*brandinfo)) 1134 error = EBUSY; 1135 if (error == 0) { 1136 for (brandinfo = &linux_brandlist[0]; 1137 *brandinfo != NULL; ++brandinfo) 1138 if (elf32_remove_brand_entry(*brandinfo) < 0) 1139 error = EINVAL; 1140 } 1141 if (error == 0) { 1142 SET_FOREACH(lihp, linux_ioctl_handler_set) 1143 linux_ioctl_unregister_handler(*lihp); 1144 SET_FOREACH(ldhp, linux_device_handler_set) 1145 linux_device_unregister_handler(*ldhp); 1146 mtx_destroy(&emul_lock); 1147 sx_destroy(&emul_shared_lock); 1148 mtx_destroy(&futex_mtx); 1149 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1150 EVENTHANDLER_DEREGISTER(schedtail, linux_schedtail_tag); 1151 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1152 linux_osd_jail_deregister(); 1153 if (bootverbose) 1154 printf("Linux ELF exec handler removed\n"); 1155 } else 1156 printf("Could not deinstall ELF interpreter entry\n"); 1157 break; 1158 default: 1159 return EOPNOTSUPP; 1160 } 1161 return error; 1162 } 1163 1164 static moduledata_t linux_elf_mod = { 1165 "linuxelf", 1166 linux_elf_modevent, 1167 0 1168 }; 1169 1170 DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
Cache object: 91bbe4203eea7ca437845a8742738b73
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