linux_sysvec.c revision 346821
1/*- 2 * Copyright (c) 1994-1996 S��ren 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: stable/11/sys/i386/linux/linux_sysvec.c 346821 2019-04-28 13:28:05Z dchagin $"); 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/sysctl.h> 48#include <sys/sysent.h> 49#include <sys/sysproto.h> 50#include <sys/vnode.h> 51#include <sys/eventhandler.h> 52 53#include <vm/vm.h> 54#include <vm/pmap.h> 55#include <vm/vm_extern.h> 56#include <vm/vm_map.h> 57#include <vm/vm_object.h> 58#include <vm/vm_page.h> 59#include <vm/vm_param.h> 60 61#include <machine/cpu.h> 62#include <machine/cputypes.h> 63#include <machine/md_var.h> 64#include <machine/pcb.h> 65 66#include <i386/linux/linux.h> 67#include <i386/linux/linux_proto.h> 68#include <compat/linux/linux_emul.h> 69#include <compat/linux/linux_futex.h> 70#include <compat/linux/linux_ioctl.h> 71#include <compat/linux/linux_mib.h> 72#include <compat/linux/linux_misc.h> 73#include <compat/linux/linux_signal.h> 74#include <compat/linux/linux_util.h> 75#include <compat/linux/linux_vdso.h> 76 77MODULE_VERSION(linux, 1); 78 79#if BYTE_ORDER == LITTLE_ENDIAN 80#define SHELLMAGIC 0x2123 /* #! */ 81#else 82#define SHELLMAGIC 0x2321 83#endif 84 85#if defined(DEBUG) 86SYSCTL_PROC(_compat_linux, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 87 linux_sysctl_debug, "A", "Linux debugging control"); 88#endif 89 90/* 91 * Allow the sendsig functions to use the ldebug() facility even though they 92 * are not syscalls themselves. Map them to syscall 0. This is slightly less 93 * bogus than using ldebug(sigreturn). 94 */ 95#define LINUX_SYS_linux_rt_sendsig 0 96#define LINUX_SYS_linux_sendsig 0 97 98#define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 99 100static int linux_szsigcode; 101static vm_object_t linux_shared_page_obj; 102static char *linux_shared_page_mapping; 103extern char _binary_linux_locore_o_start; 104extern char _binary_linux_locore_o_end; 105 106extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 107 108SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 109 110static int linux_fixup(register_t **stack_base, 111 struct image_params *iparams); 112static int elf_linux_fixup(register_t **stack_base, 113 struct image_params *iparams); 114static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 115static void exec_linux_setregs(struct thread *td, 116 struct image_params *imgp, u_long stack); 117static register_t *linux_copyout_strings(struct image_params *imgp); 118static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 119static void linux_vdso_install(void *param); 120static void linux_vdso_deinstall(void *param); 121 122static int linux_szplatform; 123const char *linux_kplatform; 124 125static eventhandler_tag linux_exit_tag; 126static eventhandler_tag linux_exec_tag; 127static eventhandler_tag linux_thread_dtor_tag; 128 129/* 130 * Linux syscalls return negative errno's, we do positive and map them 131 * Reference: 132 * FreeBSD: src/sys/sys/errno.h 133 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 134 * linux-2.6.17.8/include/asm-generic/errno.h 135 */ 136static int bsd_to_linux_errno[ELAST + 1] = { 137 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 138 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 139 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 140 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 141 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 142 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 143 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 144 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 145 -6, -6, -43, -42, -75,-125, -84, -61, -16, -74, 146 -72, -67, -71 147}; 148 149#define LINUX_T_UNKNOWN 255 150static int _bsd_to_linux_trapcode[] = { 151 LINUX_T_UNKNOWN, /* 0 */ 152 6, /* 1 T_PRIVINFLT */ 153 LINUX_T_UNKNOWN, /* 2 */ 154 3, /* 3 T_BPTFLT */ 155 LINUX_T_UNKNOWN, /* 4 */ 156 LINUX_T_UNKNOWN, /* 5 */ 157 16, /* 6 T_ARITHTRAP */ 158 254, /* 7 T_ASTFLT */ 159 LINUX_T_UNKNOWN, /* 8 */ 160 13, /* 9 T_PROTFLT */ 161 1, /* 10 T_TRCTRAP */ 162 LINUX_T_UNKNOWN, /* 11 */ 163 14, /* 12 T_PAGEFLT */ 164 LINUX_T_UNKNOWN, /* 13 */ 165 17, /* 14 T_ALIGNFLT */ 166 LINUX_T_UNKNOWN, /* 15 */ 167 LINUX_T_UNKNOWN, /* 16 */ 168 LINUX_T_UNKNOWN, /* 17 */ 169 0, /* 18 T_DIVIDE */ 170 2, /* 19 T_NMI */ 171 4, /* 20 T_OFLOW */ 172 5, /* 21 T_BOUND */ 173 7, /* 22 T_DNA */ 174 8, /* 23 T_DOUBLEFLT */ 175 9, /* 24 T_FPOPFLT */ 176 10, /* 25 T_TSSFLT */ 177 11, /* 26 T_SEGNPFLT */ 178 12, /* 27 T_STKFLT */ 179 18, /* 28 T_MCHK */ 180 19, /* 29 T_XMMFLT */ 181 15 /* 30 T_RESERVED */ 182}; 183#define bsd_to_linux_trapcode(code) \ 184 ((code)<nitems(_bsd_to_linux_trapcode)? \ 185 _bsd_to_linux_trapcode[(code)]: \ 186 LINUX_T_UNKNOWN) 187 188LINUX_VDSO_SYM_INTPTR(linux_sigcode); 189LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 190LINUX_VDSO_SYM_INTPTR(linux_vsyscall); 191 192/* 193 * If FreeBSD & Linux have a difference of opinion about what a trap 194 * means, deal with it here. 195 * 196 * MPSAFE 197 */ 198static int 199translate_traps(int signal, int trap_code) 200{ 201 if (signal != SIGBUS) 202 return (signal); 203 switch (trap_code) { 204 case T_PROTFLT: 205 case T_TSSFLT: 206 case T_DOUBLEFLT: 207 case T_PAGEFLT: 208 return (SIGSEGV); 209 default: 210 return (signal); 211 } 212} 213 214static int 215linux_fixup(register_t **stack_base, struct image_params *imgp) 216{ 217 register_t *argv, *envp; 218 219 argv = *stack_base; 220 envp = *stack_base + (imgp->args->argc + 1); 221 (*stack_base)--; 222 suword(*stack_base, (intptr_t)(void *)envp); 223 (*stack_base)--; 224 suword(*stack_base, (intptr_t)(void *)argv); 225 (*stack_base)--; 226 suword(*stack_base, imgp->args->argc); 227 return (0); 228} 229 230static int 231elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 232{ 233 struct proc *p; 234 Elf32_Auxargs *args; 235 Elf32_Addr *uplatform; 236 struct ps_strings *arginfo; 237 register_t *pos; 238 int issetugid; 239 240 KASSERT(curthread->td_proc == imgp->proc, 241 ("unsafe elf_linux_fixup(), should be curproc")); 242 243 p = imgp->proc; 244 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 245 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 246 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); 247 args = (Elf32_Auxargs *)imgp->auxargs; 248 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 249 250 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 251 imgp->proc->p_sysent->sv_shared_page_base); 252 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); 253 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 254 255 /* 256 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 257 * as it has appeared in the 2.4.0-rc7 first time. 258 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 259 * glibc falls back to the hard-coded CLK_TCK value when aux entry 260 * is not present. 261 * Also see linux_times() implementation. 262 */ 263 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 264 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 265 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 266 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 267 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 268 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 269 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 270 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 271 AUXARGS_ENTRY(pos, AT_BASE, args->base); 272 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 273 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 274 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 275 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 276 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 277 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 278 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); 279 if (imgp->execpathp != 0) 280 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); 281 if (args->execfd != -1) 282 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 283 AUXARGS_ENTRY(pos, AT_NULL, 0); 284 285 free(imgp->auxargs, M_TEMP); 286 imgp->auxargs = NULL; 287 288 (*stack_base)--; 289 suword(*stack_base, (register_t)imgp->args->argc); 290 return (0); 291} 292 293/* 294 * Copied from kern/kern_exec.c 295 */ 296static register_t * 297linux_copyout_strings(struct image_params *imgp) 298{ 299 int argc, envc; 300 char **vectp; 301 char *stringp, *destp; 302 register_t *stack_base; 303 struct ps_strings *arginfo; 304 char canary[LINUX_AT_RANDOM_LEN]; 305 size_t execpath_len; 306 struct proc *p; 307 308 /* Calculate string base and vector table pointers. */ 309 p = imgp->proc; 310 if (imgp->execpath != NULL && imgp->auxargs != NULL) 311 execpath_len = strlen(imgp->execpath) + 1; 312 else 313 execpath_len = 0; 314 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 315 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - 316 roundup(sizeof(canary), sizeof(char *)) - 317 roundup(execpath_len, sizeof(char *)) - 318 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 319 320 /* Install LINUX_PLATFORM. */ 321 copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform), 322 linux_szplatform); 323 324 if (execpath_len != 0) { 325 imgp->execpathp = (uintptr_t)arginfo - 326 linux_szplatform - execpath_len; 327 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 328 } 329 330 /* Prepare the canary for SSP. */ 331 arc4rand(canary, sizeof(canary), 0); 332 imgp->canary = (uintptr_t)arginfo - linux_szplatform - 333 roundup(execpath_len, sizeof(char *)) - 334 roundup(sizeof(canary), sizeof(char *)); 335 copyout(canary, (void *)imgp->canary, sizeof(canary)); 336 337 vectp = (char **)destp; 338 if (imgp->auxargs) { 339 /* 340 * Allocate room on the stack for the ELF auxargs 341 * array. It has LINUX_AT_COUNT entries. 342 */ 343 vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf32_Auxinfo), 344 sizeof(*vectp)); 345 } 346 347 /* 348 * Allocate room for the argv[] and env vectors including the 349 * terminating NULL pointers. 350 */ 351 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 352 353 /* vectp also becomes our initial stack base. */ 354 stack_base = (register_t *)vectp; 355 356 stringp = imgp->args->begin_argv; 357 argc = imgp->args->argc; 358 envc = imgp->args->envc; 359 360 /* Copy out strings - arguments and environment. */ 361 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 362 363 /* Fill in "ps_strings" struct for ps, w, etc. */ 364 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 365 suword(&arginfo->ps_nargvstr, argc); 366 367 /* Fill in argument portion of vector table. */ 368 for (; argc > 0; --argc) { 369 suword(vectp++, (long)(intptr_t)destp); 370 while (*stringp++ != 0) 371 destp++; 372 destp++; 373 } 374 375 /* A null vector table pointer separates the argp's from the envp's. */ 376 suword(vectp++, 0); 377 378 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 379 suword(&arginfo->ps_nenvstr, envc); 380 381 /* Fill in environment portion of vector table. */ 382 for (; envc > 0; --envc) { 383 suword(vectp++, (long)(intptr_t)destp); 384 while (*stringp++ != 0) 385 destp++; 386 destp++; 387 } 388 389 /* The end of the vector table is a null pointer. */ 390 suword(vectp, 0); 391 392 return (stack_base); 393} 394 395static void 396linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 397{ 398 struct thread *td = curthread; 399 struct proc *p = td->td_proc; 400 struct sigacts *psp; 401 struct trapframe *regs; 402 struct l_rt_sigframe *fp, frame; 403 int sig, code; 404 int oonstack; 405 406 sig = ksi->ksi_signo; 407 code = ksi->ksi_code; 408 PROC_LOCK_ASSERT(p, MA_OWNED); 409 psp = p->p_sigacts; 410 mtx_assert(&psp->ps_mtx, MA_OWNED); 411 regs = td->td_frame; 412 oonstack = sigonstack(regs->tf_esp); 413 414#ifdef DEBUG 415 if (ldebug(rt_sendsig)) 416 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 417 catcher, sig, (void*)mask, code); 418#endif 419 /* Allocate space for the signal handler context. */ 420 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 421 SIGISMEMBER(psp->ps_sigonstack, sig)) { 422 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 423 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 424 } else 425 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 426 mtx_unlock(&psp->ps_mtx); 427 428 /* Build the argument list for the signal handler. */ 429 sig = bsd_to_linux_signal(sig); 430 431 bzero(&frame, sizeof(frame)); 432 433 frame.sf_handler = catcher; 434 frame.sf_sig = sig; 435 frame.sf_siginfo = &fp->sf_si; 436 frame.sf_ucontext = &fp->sf_sc; 437 438 /* Fill in POSIX parts. */ 439 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 440 441 /* Build the signal context to be used by sigreturn. */ 442 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 443 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 444 445 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 446 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 447 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 448 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 449 PROC_UNLOCK(p); 450 451 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 452 453 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 454 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 455 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 456 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 457 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 458 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 459 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 460 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 461 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 462 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 463 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 464 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 465 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 466 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 467 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 468 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 469 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 470 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 471 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 472 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 473 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 474 475#ifdef DEBUG 476 if (ldebug(rt_sendsig)) 477 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 478 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 479 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 480#endif 481 482 if (copyout(&frame, fp, sizeof(frame)) != 0) { 483 /* 484 * Process has trashed its stack; give it an illegal 485 * instruction to halt it in its tracks. 486 */ 487#ifdef DEBUG 488 if (ldebug(rt_sendsig)) 489 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 490 fp, oonstack); 491#endif 492 PROC_LOCK(p); 493 sigexit(td, SIGILL); 494 } 495 496 /* Build context to run handler in. */ 497 regs->tf_esp = (int)fp; 498 regs->tf_eip = linux_rt_sigcode; 499 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 500 regs->tf_cs = _ucodesel; 501 regs->tf_ds = _udatasel; 502 regs->tf_es = _udatasel; 503 regs->tf_fs = _udatasel; 504 regs->tf_ss = _udatasel; 505 PROC_LOCK(p); 506 mtx_lock(&psp->ps_mtx); 507} 508 509 510/* 511 * Send an interrupt to process. 512 * 513 * Stack is set up to allow sigcode stored 514 * in u. to call routine, followed by kcall 515 * to sigreturn routine below. After sigreturn 516 * resets the signal mask, the stack, and the 517 * frame pointer, it returns to the user 518 * specified pc, psl. 519 */ 520static void 521linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 522{ 523 struct thread *td = curthread; 524 struct proc *p = td->td_proc; 525 struct sigacts *psp; 526 struct trapframe *regs; 527 struct l_sigframe *fp, frame; 528 l_sigset_t lmask; 529 int sig, code; 530 int oonstack; 531 532 PROC_LOCK_ASSERT(p, MA_OWNED); 533 psp = p->p_sigacts; 534 sig = ksi->ksi_signo; 535 code = ksi->ksi_code; 536 mtx_assert(&psp->ps_mtx, MA_OWNED); 537 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 538 /* Signal handler installed with SA_SIGINFO. */ 539 linux_rt_sendsig(catcher, ksi, mask); 540 return; 541 } 542 regs = td->td_frame; 543 oonstack = sigonstack(regs->tf_esp); 544 545#ifdef DEBUG 546 if (ldebug(sendsig)) 547 printf(ARGS(sendsig, "%p, %d, %p, %u"), 548 catcher, sig, (void*)mask, code); 549#endif 550 551 /* Allocate space for the signal handler context. */ 552 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 553 SIGISMEMBER(psp->ps_sigonstack, sig)) { 554 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 555 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 556 } else 557 fp = (struct l_sigframe *)regs->tf_esp - 1; 558 mtx_unlock(&psp->ps_mtx); 559 PROC_UNLOCK(p); 560 561 /* Build the argument list for the signal handler. */ 562 sig = bsd_to_linux_signal(sig); 563 564 bzero(&frame, sizeof(frame)); 565 566 frame.sf_handler = catcher; 567 frame.sf_sig = sig; 568 569 bsd_to_linux_sigset(mask, &lmask); 570 571 /* Build the signal context to be used by sigreturn. */ 572 frame.sf_sc.sc_mask = lmask.__mask; 573 frame.sf_sc.sc_gs = rgs(); 574 frame.sf_sc.sc_fs = regs->tf_fs; 575 frame.sf_sc.sc_es = regs->tf_es; 576 frame.sf_sc.sc_ds = regs->tf_ds; 577 frame.sf_sc.sc_edi = regs->tf_edi; 578 frame.sf_sc.sc_esi = regs->tf_esi; 579 frame.sf_sc.sc_ebp = regs->tf_ebp; 580 frame.sf_sc.sc_ebx = regs->tf_ebx; 581 frame.sf_sc.sc_esp = regs->tf_esp; 582 frame.sf_sc.sc_edx = regs->tf_edx; 583 frame.sf_sc.sc_ecx = regs->tf_ecx; 584 frame.sf_sc.sc_eax = regs->tf_eax; 585 frame.sf_sc.sc_eip = regs->tf_eip; 586 frame.sf_sc.sc_cs = regs->tf_cs; 587 frame.sf_sc.sc_eflags = regs->tf_eflags; 588 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 589 frame.sf_sc.sc_ss = regs->tf_ss; 590 frame.sf_sc.sc_err = regs->tf_err; 591 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 592 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 593 594 frame.sf_extramask[0] = lmask.__mask; 595 596 if (copyout(&frame, fp, sizeof(frame)) != 0) { 597 /* 598 * Process has trashed its stack; give it an illegal 599 * instruction to halt it in its tracks. 600 */ 601 PROC_LOCK(p); 602 sigexit(td, SIGILL); 603 } 604 605 /* Build context to run handler in. */ 606 regs->tf_esp = (int)fp; 607 regs->tf_eip = linux_sigcode; 608 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 609 regs->tf_cs = _ucodesel; 610 regs->tf_ds = _udatasel; 611 regs->tf_es = _udatasel; 612 regs->tf_fs = _udatasel; 613 regs->tf_ss = _udatasel; 614 PROC_LOCK(p); 615 mtx_lock(&psp->ps_mtx); 616} 617 618/* 619 * System call to cleanup state after a signal 620 * has been taken. Reset signal mask and 621 * stack state from context left by sendsig (above). 622 * Return to previous pc and psl as specified by 623 * context left by sendsig. Check carefully to 624 * make sure that the user has not modified the 625 * psl to gain improper privileges or to cause 626 * a machine fault. 627 */ 628int 629linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 630{ 631 struct l_sigframe frame; 632 struct trapframe *regs; 633 l_sigset_t lmask; 634 sigset_t bmask; 635 int eflags; 636 ksiginfo_t ksi; 637 638 regs = td->td_frame; 639 640#ifdef DEBUG 641 if (ldebug(sigreturn)) 642 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 643#endif 644 /* 645 * The trampoline code hands us the sigframe. 646 * It is unsafe to keep track of it ourselves, in the event that a 647 * program jumps out of a signal handler. 648 */ 649 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 650 return (EFAULT); 651 652 /* Check for security violations. */ 653#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 654 eflags = frame.sf_sc.sc_eflags; 655 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 656 return (EINVAL); 657 658 /* 659 * Don't allow users to load a valid privileged %cs. Let the 660 * hardware check for invalid selectors, excess privilege in 661 * other selectors, invalid %eip's and invalid %esp's. 662 */ 663#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 664 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 665 ksiginfo_init_trap(&ksi); 666 ksi.ksi_signo = SIGBUS; 667 ksi.ksi_code = BUS_OBJERR; 668 ksi.ksi_trapno = T_PROTFLT; 669 ksi.ksi_addr = (void *)regs->tf_eip; 670 trapsignal(td, &ksi); 671 return (EINVAL); 672 } 673 674 lmask.__mask = frame.sf_sc.sc_mask; 675 linux_to_bsd_sigset(&lmask, &bmask); 676 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 677 678 /* Restore signal context. */ 679 /* %gs was restored by the trampoline. */ 680 regs->tf_fs = frame.sf_sc.sc_fs; 681 regs->tf_es = frame.sf_sc.sc_es; 682 regs->tf_ds = frame.sf_sc.sc_ds; 683 regs->tf_edi = frame.sf_sc.sc_edi; 684 regs->tf_esi = frame.sf_sc.sc_esi; 685 regs->tf_ebp = frame.sf_sc.sc_ebp; 686 regs->tf_ebx = frame.sf_sc.sc_ebx; 687 regs->tf_edx = frame.sf_sc.sc_edx; 688 regs->tf_ecx = frame.sf_sc.sc_ecx; 689 regs->tf_eax = frame.sf_sc.sc_eax; 690 regs->tf_eip = frame.sf_sc.sc_eip; 691 regs->tf_cs = frame.sf_sc.sc_cs; 692 regs->tf_eflags = eflags; 693 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 694 regs->tf_ss = frame.sf_sc.sc_ss; 695 696 return (EJUSTRETURN); 697} 698 699/* 700 * System call to cleanup state after a signal 701 * has been taken. Reset signal mask and 702 * stack state from context left by rt_sendsig (above). 703 * Return to previous pc and psl as specified by 704 * context left by sendsig. Check carefully to 705 * make sure that the user has not modified the 706 * psl to gain improper privileges or to cause 707 * a machine fault. 708 */ 709int 710linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 711{ 712 struct l_ucontext uc; 713 struct l_sigcontext *context; 714 sigset_t bmask; 715 l_stack_t *lss; 716 stack_t ss; 717 struct trapframe *regs; 718 int eflags; 719 ksiginfo_t ksi; 720 721 regs = td->td_frame; 722 723#ifdef DEBUG 724 if (ldebug(rt_sigreturn)) 725 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 726#endif 727 /* 728 * The trampoline code hands us the ucontext. 729 * It is unsafe to keep track of it ourselves, in the event that a 730 * program jumps out of a signal handler. 731 */ 732 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 733 return (EFAULT); 734 735 context = &uc.uc_mcontext; 736 737 /* Check for security violations. */ 738#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 739 eflags = context->sc_eflags; 740 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 741 return (EINVAL); 742 743 /* 744 * Don't allow users to load a valid privileged %cs. Let the 745 * hardware check for invalid selectors, excess privilege in 746 * other selectors, invalid %eip's and invalid %esp's. 747 */ 748#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 749 if (!CS_SECURE(context->sc_cs)) { 750 ksiginfo_init_trap(&ksi); 751 ksi.ksi_signo = SIGBUS; 752 ksi.ksi_code = BUS_OBJERR; 753 ksi.ksi_trapno = T_PROTFLT; 754 ksi.ksi_addr = (void *)regs->tf_eip; 755 trapsignal(td, &ksi); 756 return (EINVAL); 757 } 758 759 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 760 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 761 762 /* Restore signal context. */ 763 /* %gs was restored by the trampoline. */ 764 regs->tf_fs = context->sc_fs; 765 regs->tf_es = context->sc_es; 766 regs->tf_ds = context->sc_ds; 767 regs->tf_edi = context->sc_edi; 768 regs->tf_esi = context->sc_esi; 769 regs->tf_ebp = context->sc_ebp; 770 regs->tf_ebx = context->sc_ebx; 771 regs->tf_edx = context->sc_edx; 772 regs->tf_ecx = context->sc_ecx; 773 regs->tf_eax = context->sc_eax; 774 regs->tf_eip = context->sc_eip; 775 regs->tf_cs = context->sc_cs; 776 regs->tf_eflags = eflags; 777 regs->tf_esp = context->sc_esp_at_signal; 778 regs->tf_ss = context->sc_ss; 779 780 /* Call sigaltstack & ignore results. */ 781 lss = &uc.uc_stack; 782 ss.ss_sp = lss->ss_sp; 783 ss.ss_size = lss->ss_size; 784 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 785 786#ifdef DEBUG 787 if (ldebug(rt_sigreturn)) 788 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 789 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 790#endif 791 (void)kern_sigaltstack(td, &ss, NULL); 792 793 return (EJUSTRETURN); 794} 795 796static int 797linux_fetch_syscall_args(struct thread *td) 798{ 799 struct proc *p; 800 struct trapframe *frame; 801 struct syscall_args *sa; 802 803 p = td->td_proc; 804 frame = td->td_frame; 805 sa = &td->td_sa; 806 807 sa->code = frame->tf_eax; 808 sa->args[0] = frame->tf_ebx; 809 sa->args[1] = frame->tf_ecx; 810 sa->args[2] = frame->tf_edx; 811 sa->args[3] = frame->tf_esi; 812 sa->args[4] = frame->tf_edi; 813 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 814 815 if (sa->code >= p->p_sysent->sv_size) 816 /* nosys */ 817 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 818 else 819 sa->callp = &p->p_sysent->sv_table[sa->code]; 820 sa->narg = sa->callp->sy_narg; 821 822 td->td_retval[0] = 0; 823 td->td_retval[1] = frame->tf_edx; 824 825 return (0); 826} 827 828/* 829 * If a Linux binary is exec'ing something, try this image activator 830 * first. We override standard shell script execution in order to 831 * be able to modify the interpreter path. We only do this if a Linux 832 * binary is doing the exec, so we do not create an EXEC module for it. 833 */ 834static int exec_linux_imgact_try(struct image_params *iparams); 835 836static int 837exec_linux_imgact_try(struct image_params *imgp) 838{ 839 const char *head = (const char *)imgp->image_header; 840 char *rpath; 841 int error = -1; 842 843 /* 844 * The interpreter for shell scripts run from a Linux binary needs 845 * to be located in /compat/linux if possible in order to recursively 846 * maintain Linux path emulation. 847 */ 848 if (((const short *)head)[0] == SHELLMAGIC) { 849 /* 850 * Run our normal shell image activator. If it succeeds attempt 851 * to use the alternate path for the interpreter. If an alternate 852 * path is found, use our stringspace to store it. 853 */ 854 if ((error = exec_shell_imgact(imgp)) == 0) { 855 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 856 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 857 if (rpath != NULL) 858 imgp->args->fname_buf = 859 imgp->interpreter_name = rpath; 860 } 861 } 862 return (error); 863} 864 865/* 866 * exec_setregs may initialize some registers differently than Linux 867 * does, thus potentially confusing Linux binaries. If necessary, we 868 * override the exec_setregs default(s) here. 869 */ 870static void 871exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 872{ 873 struct pcb *pcb = td->td_pcb; 874 875 exec_setregs(td, imgp, stack); 876 877 /* Linux sets %gs to 0, we default to _udatasel. */ 878 pcb->pcb_gs = 0; 879 load_gs(0); 880 881 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 882} 883 884static void 885linux_get_machine(const char **dst) 886{ 887 888 switch (cpu_class) { 889 case CPUCLASS_686: 890 *dst = "i686"; 891 break; 892 case CPUCLASS_586: 893 *dst = "i586"; 894 break; 895 case CPUCLASS_486: 896 *dst = "i486"; 897 break; 898 default: 899 *dst = "i386"; 900 } 901} 902 903struct sysentvec linux_sysvec = { 904 .sv_size = LINUX_SYS_MAXSYSCALL, 905 .sv_table = linux_sysent, 906 .sv_mask = 0, 907 .sv_errsize = ELAST + 1, 908 .sv_errtbl = bsd_to_linux_errno, 909 .sv_transtrap = translate_traps, 910 .sv_fixup = linux_fixup, 911 .sv_sendsig = linux_sendsig, 912 .sv_sigcode = &_binary_linux_locore_o_start, 913 .sv_szsigcode = &linux_szsigcode, 914 .sv_name = "Linux a.out", 915 .sv_coredump = NULL, 916 .sv_imgact_try = exec_linux_imgact_try, 917 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 918 .sv_pagesize = PAGE_SIZE, 919 .sv_minuser = VM_MIN_ADDRESS, 920 .sv_maxuser = VM_MAXUSER_ADDRESS, 921 .sv_usrstack = LINUX_USRSTACK, 922 .sv_psstrings = PS_STRINGS, 923 .sv_stackprot = VM_PROT_ALL, 924 .sv_copyout_strings = exec_copyout_strings, 925 .sv_setregs = exec_linux_setregs, 926 .sv_fixlimit = NULL, 927 .sv_maxssiz = NULL, 928 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 929 .sv_set_syscall_retval = cpu_set_syscall_retval, 930 .sv_fetch_syscall_args = linux_fetch_syscall_args, 931 .sv_syscallnames = NULL, 932 .sv_shared_page_base = LINUX_SHAREDPAGE, 933 .sv_shared_page_len = PAGE_SIZE, 934 .sv_schedtail = linux_schedtail, 935 .sv_thread_detach = linux_thread_detach, 936 .sv_trap = NULL, 937}; 938INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 939 940struct sysentvec elf_linux_sysvec = { 941 .sv_size = LINUX_SYS_MAXSYSCALL, 942 .sv_table = linux_sysent, 943 .sv_mask = 0, 944 .sv_errsize = ELAST + 1, 945 .sv_errtbl = bsd_to_linux_errno, 946 .sv_transtrap = translate_traps, 947 .sv_fixup = elf_linux_fixup, 948 .sv_sendsig = linux_sendsig, 949 .sv_sigcode = &_binary_linux_locore_o_start, 950 .sv_szsigcode = &linux_szsigcode, 951 .sv_name = "Linux ELF", 952 .sv_coredump = elf32_coredump, 953 .sv_imgact_try = exec_linux_imgact_try, 954 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 955 .sv_pagesize = PAGE_SIZE, 956 .sv_minuser = VM_MIN_ADDRESS, 957 .sv_maxuser = VM_MAXUSER_ADDRESS, 958 .sv_usrstack = LINUX_USRSTACK, 959 .sv_psstrings = LINUX_PS_STRINGS, 960 .sv_stackprot = VM_PROT_ALL, 961 .sv_copyout_strings = linux_copyout_strings, 962 .sv_setregs = exec_linux_setregs, 963 .sv_fixlimit = NULL, 964 .sv_maxssiz = NULL, 965 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, 966 .sv_set_syscall_retval = cpu_set_syscall_retval, 967 .sv_fetch_syscall_args = linux_fetch_syscall_args, 968 .sv_syscallnames = NULL, 969 .sv_shared_page_base = LINUX_SHAREDPAGE, 970 .sv_shared_page_len = PAGE_SIZE, 971 .sv_schedtail = linux_schedtail, 972 .sv_thread_detach = linux_thread_detach, 973 .sv_trap = NULL, 974}; 975 976static void 977linux_vdso_install(void *param) 978{ 979 980 linux_szsigcode = (&_binary_linux_locore_o_end - 981 &_binary_linux_locore_o_start); 982 983 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 984 panic("Linux invalid vdso size\n"); 985 986 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 987 988 linux_shared_page_obj = __elfN(linux_shared_page_init) 989 (&linux_shared_page_mapping); 990 991 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 992 993 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 994 linux_szsigcode); 995 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 996} 997SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 998 (sysinit_cfunc_t)linux_vdso_install, NULL); 999 1000static void 1001linux_vdso_deinstall(void *param) 1002{ 1003 1004 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1005}; 1006SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1007 (sysinit_cfunc_t)linux_vdso_deinstall, NULL); 1008 1009static char GNU_ABI_VENDOR[] = "GNU"; 1010static int GNULINUX_ABI_DESC = 0; 1011 1012static bool 1013linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1014{ 1015 const Elf32_Word *desc; 1016 uintptr_t p; 1017 1018 p = (uintptr_t)(note + 1); 1019 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1020 1021 desc = (const Elf32_Word *)p; 1022 if (desc[0] != GNULINUX_ABI_DESC) 1023 return (false); 1024 1025 /* 1026 * For Linux we encode osrel as follows (see linux_mib.c): 1027 * VVVMMMIII (version, major, minor), see linux_mib.c. 1028 */ 1029 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1030 1031 return (true); 1032} 1033 1034static Elf_Brandnote linux_brandnote = { 1035 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1036 .hdr.n_descsz = 16, /* XXX at least 16 */ 1037 .hdr.n_type = 1, 1038 .vendor = GNU_ABI_VENDOR, 1039 .flags = BN_TRANSLATE_OSREL, 1040 .trans_osrel = linux_trans_osrel 1041}; 1042 1043static Elf32_Brandinfo linux_brand = { 1044 .brand = ELFOSABI_LINUX, 1045 .machine = EM_386, 1046 .compat_3_brand = "Linux", 1047 .emul_path = "/compat/linux", 1048 .interp_path = "/lib/ld-linux.so.1", 1049 .sysvec = &elf_linux_sysvec, 1050 .interp_newpath = NULL, 1051 .brand_note = &linux_brandnote, 1052 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1053}; 1054 1055static Elf32_Brandinfo linux_glibc2brand = { 1056 .brand = ELFOSABI_LINUX, 1057 .machine = EM_386, 1058 .compat_3_brand = "Linux", 1059 .emul_path = "/compat/linux", 1060 .interp_path = "/lib/ld-linux.so.2", 1061 .sysvec = &elf_linux_sysvec, 1062 .interp_newpath = NULL, 1063 .brand_note = &linux_brandnote, 1064 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1065}; 1066 1067static Elf32_Brandinfo linux_muslbrand = { 1068 .brand = ELFOSABI_LINUX, 1069 .machine = EM_386, 1070 .compat_3_brand = "Linux", 1071 .emul_path = "/compat/linux", 1072 .interp_path = "/lib/ld-musl-i386.so.1", 1073 .sysvec = &elf_linux_sysvec, 1074 .interp_newpath = NULL, 1075 .brand_note = &linux_brandnote, 1076 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1077}; 1078 1079Elf32_Brandinfo *linux_brandlist[] = { 1080 &linux_brand, 1081 &linux_glibc2brand, 1082 &linux_muslbrand, 1083 NULL 1084}; 1085 1086static int 1087linux_elf_modevent(module_t mod, int type, void *data) 1088{ 1089 Elf32_Brandinfo **brandinfo; 1090 int error; 1091 struct linux_ioctl_handler **lihp; 1092 1093 error = 0; 1094 1095 switch(type) { 1096 case MOD_LOAD: 1097 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1098 ++brandinfo) 1099 if (elf32_insert_brand_entry(*brandinfo) < 0) 1100 error = EINVAL; 1101 if (error == 0) { 1102 SET_FOREACH(lihp, linux_ioctl_handler_set) 1103 linux_ioctl_register_handler(*lihp); 1104 LIST_INIT(&futex_list); 1105 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1106 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1107 NULL, 1000); 1108 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1109 NULL, 1000); 1110 linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, 1111 linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); 1112 linux_get_machine(&linux_kplatform); 1113 linux_szplatform = roundup(strlen(linux_kplatform) + 1, 1114 sizeof(char *)); 1115 linux_osd_jail_register(); 1116 stclohz = (stathz ? stathz : hz); 1117 if (bootverbose) 1118 printf("Linux ELF exec handler installed\n"); 1119 } else 1120 printf("cannot insert Linux ELF brand handler\n"); 1121 break; 1122 case MOD_UNLOAD: 1123 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1124 ++brandinfo) 1125 if (elf32_brand_inuse(*brandinfo)) 1126 error = EBUSY; 1127 if (error == 0) { 1128 for (brandinfo = &linux_brandlist[0]; 1129 *brandinfo != NULL; ++brandinfo) 1130 if (elf32_remove_brand_entry(*brandinfo) < 0) 1131 error = EINVAL; 1132 } 1133 if (error == 0) { 1134 SET_FOREACH(lihp, linux_ioctl_handler_set) 1135 linux_ioctl_unregister_handler(*lihp); 1136 mtx_destroy(&futex_mtx); 1137 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1138 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1139 EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); 1140 linux_osd_jail_deregister(); 1141 if (bootverbose) 1142 printf("Linux ELF exec handler removed\n"); 1143 } else 1144 printf("Could not deinstall ELF interpreter entry\n"); 1145 break; 1146 default: 1147 return (EOPNOTSUPP); 1148 } 1149 return (error); 1150} 1151 1152static moduledata_t linux_elf_mod = { 1153 "linuxelf", 1154 linux_elf_modevent, 1155 0 1156}; 1157 1158DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1159FEATURE(linux, "Linux 32bit support"); 1160