1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1994-1996 Søren Schmidt 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 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 77 MODULE_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) 86 SYSCTL_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)) 99 100 static int linux_szsigcode; 101 static vm_object_t linux_shared_page_obj; 102 static char *linux_shared_page_mapping; 103 extern char _binary_linux_locore_o_start; 104 extern char _binary_linux_locore_o_end; 105 106 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 107 108 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 109 110 static int linux_fixup(register_t **stack_base, 111 struct image_params *iparams); 112 static int elf_linux_fixup(register_t **stack_base, 113 struct image_params *iparams); 114 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 115 static void exec_linux_setregs(struct thread *td, 116 struct image_params *imgp, u_long stack); 117 static register_t *linux_copyout_strings(struct image_params *imgp); 118 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 119 static void linux_vdso_install(void *param); 120 static void linux_vdso_deinstall(void *param); 121 122 static int linux_szplatform; 123 const char *linux_kplatform; 124 125 static eventhandler_tag linux_exit_tag; 126 static eventhandler_tag linux_exec_tag; 127 static 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 */ 136 static 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 255 150 static 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) 187 188 LINUX_VDSO_SYM_INTPTR(linux_sigcode); 189 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 190 LINUX_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 */ 198 static int 199 translate_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 } 213 214 static int 215 linux_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 } 229 230 static int 231 elf_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 */ 296 static register_t * 297 linux_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 /* If we have a valid auxargs ptr, prepare some room on the stack. */ 338 if (imgp->auxargs) { 339 /* 340 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 341 * lower compatibility. 342 */ 343 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 344 (LINUX_AT_COUNT * 2); 345 /* 346 * The '+ 2' is for the null pointers at the end of each of 347 * the arg and env vector sets,and imgp->auxarg_size is room 348 * for argument of Runtime loader. 349 */ 350 vectp = (char **)(destp - (imgp->args->argc + 351 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 352 } else { 353 /* 354 * The '+ 2' is for the null pointers at the end of each of 355 * the arg and env vector sets 356 */ 357 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 358 sizeof(char *)); 359 } 360 361 /* vectp also becomes our initial stack base. */ 362 stack_base = (register_t *)vectp; 363 364 stringp = imgp->args->begin_argv; 365 argc = imgp->args->argc; 366 envc = imgp->args->envc; 367 368 /* Copy out strings - arguments and environment. */ 369 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 370 371 /* Fill in "ps_strings" struct for ps, w, etc. */ 372 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 373 suword(&arginfo->ps_nargvstr, argc); 374 375 /* Fill in argument portion of vector table. */ 376 for (; argc > 0; --argc) { 377 suword(vectp++, (long)(intptr_t)destp); 378 while (*stringp++ != 0) 379 destp++; 380 destp++; 381 } 382 383 /* A null vector table pointer separates the argp's from the envp's. */ 384 suword(vectp++, 0); 385 386 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 387 suword(&arginfo->ps_nenvstr, envc); 388 389 /* Fill in environment portion of vector table. */ 390 for (; envc > 0; --envc) { 391 suword(vectp++, (long)(intptr_t)destp); 392 while (*stringp++ != 0) 393 destp++; 394 destp++; 395 } 396 397 /* The end of the vector table is a null pointer. */ 398 suword(vectp, 0); 399 400 return (stack_base); 401 } 402 403 static void 404 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 405 { 406 struct thread *td = curthread; 407 struct proc *p = td->td_proc; 408 struct sigacts *psp; 409 struct trapframe *regs; 410 struct l_rt_sigframe *fp, frame; 411 int sig, code; 412 int oonstack; 413 414 sig = ksi->ksi_signo; 415 code = ksi->ksi_code; 416 PROC_LOCK_ASSERT(p, MA_OWNED); 417 psp = p->p_sigacts; 418 mtx_assert(&psp->ps_mtx, MA_OWNED); 419 regs = td->td_frame; 420 oonstack = sigonstack(regs->tf_esp); 421 422 #ifdef DEBUG 423 if (ldebug(rt_sendsig)) 424 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 425 catcher, sig, (void*)mask, code); 426 #endif 427 /* Allocate space for the signal handler context. */ 428 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 429 SIGISMEMBER(psp->ps_sigonstack, sig)) { 430 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 431 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 432 } else 433 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 434 mtx_unlock(&psp->ps_mtx); 435 436 /* Build the argument list for the signal handler. */ 437 sig = bsd_to_linux_signal(sig); 438 439 bzero(&frame, sizeof(frame)); 440 441 frame.sf_handler = catcher; 442 frame.sf_sig = sig; 443 frame.sf_siginfo = &fp->sf_si; 444 frame.sf_ucontext = &fp->sf_sc; 445 446 /* Fill in POSIX parts. */ 447 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 448 449 /* Build the signal context to be used by sigreturn. */ 450 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 451 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 452 453 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 454 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 455 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 456 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 457 PROC_UNLOCK(p); 458 459 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 460 461 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 462 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 463 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 464 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 465 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 466 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 467 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 468 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 469 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 470 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 471 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 472 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 473 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 474 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 475 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 476 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 477 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 478 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 479 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 480 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 481 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 482 483 #ifdef DEBUG 484 if (ldebug(rt_sendsig)) 485 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 486 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 487 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 488 #endif 489 490 if (copyout(&frame, fp, sizeof(frame)) != 0) { 491 /* 492 * Process has trashed its stack; give it an illegal 493 * instruction to halt it in its tracks. 494 */ 495 #ifdef DEBUG 496 if (ldebug(rt_sendsig)) 497 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 498 fp, oonstack); 499 #endif 500 PROC_LOCK(p); 501 sigexit(td, SIGILL); 502 } 503 504 /* Build context to run handler in. */ 505 regs->tf_esp = (int)fp; 506 regs->tf_eip = linux_rt_sigcode; 507 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 508 regs->tf_cs = _ucodesel; 509 regs->tf_ds = _udatasel; 510 regs->tf_es = _udatasel; 511 regs->tf_fs = _udatasel; 512 regs->tf_ss = _udatasel; 513 PROC_LOCK(p); 514 mtx_lock(&psp->ps_mtx); 515 } 516 517 518 /* 519 * Send an interrupt to process. 520 * 521 * Stack is set up to allow sigcode stored 522 * in u. to call routine, followed by kcall 523 * to sigreturn routine below. After sigreturn 524 * resets the signal mask, the stack, and the 525 * frame pointer, it returns to the user 526 * specified pc, psl. 527 */ 528 static void 529 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 530 { 531 struct thread *td = curthread; 532 struct proc *p = td->td_proc; 533 struct sigacts *psp; 534 struct trapframe *regs; 535 struct l_sigframe *fp, frame; 536 l_sigset_t lmask; 537 int sig, code; 538 int oonstack; 539 540 PROC_LOCK_ASSERT(p, MA_OWNED); 541 psp = p->p_sigacts; 542 sig = ksi->ksi_signo; 543 code = ksi->ksi_code; 544 mtx_assert(&psp->ps_mtx, MA_OWNED); 545 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 546 /* Signal handler installed with SA_SIGINFO. */ 547 linux_rt_sendsig(catcher, ksi, mask); 548 return; 549 } 550 regs = td->td_frame; 551 oonstack = sigonstack(regs->tf_esp); 552 553 #ifdef DEBUG 554 if (ldebug(sendsig)) 555 printf(ARGS(sendsig, "%p, %d, %p, %u"), 556 catcher, sig, (void*)mask, code); 557 #endif 558 559 /* Allocate space for the signal handler context. */ 560 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 561 SIGISMEMBER(psp->ps_sigonstack, sig)) { 562 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 563 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 564 } else 565 fp = (struct l_sigframe *)regs->tf_esp - 1; 566 mtx_unlock(&psp->ps_mtx); 567 PROC_UNLOCK(p); 568 569 /* Build the argument list for the signal handler. */ 570 sig = bsd_to_linux_signal(sig); 571 572 bzero(&frame, sizeof(frame)); 573 574 frame.sf_handler = catcher; 575 frame.sf_sig = sig; 576 577 bsd_to_linux_sigset(mask, &lmask); 578 579 /* Build the signal context to be used by sigreturn. */ 580 frame.sf_sc.sc_mask = lmask.__mask; 581 frame.sf_sc.sc_gs = rgs(); 582 frame.sf_sc.sc_fs = regs->tf_fs; 583 frame.sf_sc.sc_es = regs->tf_es; 584 frame.sf_sc.sc_ds = regs->tf_ds; 585 frame.sf_sc.sc_edi = regs->tf_edi; 586 frame.sf_sc.sc_esi = regs->tf_esi; 587 frame.sf_sc.sc_ebp = regs->tf_ebp; 588 frame.sf_sc.sc_ebx = regs->tf_ebx; 589 frame.sf_sc.sc_esp = regs->tf_esp; 590 frame.sf_sc.sc_edx = regs->tf_edx; 591 frame.sf_sc.sc_ecx = regs->tf_ecx; 592 frame.sf_sc.sc_eax = regs->tf_eax; 593 frame.sf_sc.sc_eip = regs->tf_eip; 594 frame.sf_sc.sc_cs = regs->tf_cs; 595 frame.sf_sc.sc_eflags = regs->tf_eflags; 596 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 597 frame.sf_sc.sc_ss = regs->tf_ss; 598 frame.sf_sc.sc_err = regs->tf_err; 599 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 600 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 601 602 frame.sf_extramask[0] = lmask.__mask; 603 604 if (copyout(&frame, fp, sizeof(frame)) != 0) { 605 /* 606 * Process has trashed its stack; give it an illegal 607 * instruction to halt it in its tracks. 608 */ 609 PROC_LOCK(p); 610 sigexit(td, SIGILL); 611 } 612 613 /* Build context to run handler in. */ 614 regs->tf_esp = (int)fp; 615 regs->tf_eip = linux_sigcode; 616 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 617 regs->tf_cs = _ucodesel; 618 regs->tf_ds = _udatasel; 619 regs->tf_es = _udatasel; 620 regs->tf_fs = _udatasel; 621 regs->tf_ss = _udatasel; 622 PROC_LOCK(p); 623 mtx_lock(&psp->ps_mtx); 624 } 625 626 /* 627 * System call to cleanup state after a signal 628 * has been taken. Reset signal mask and 629 * stack state from context left by sendsig (above). 630 * Return to previous pc and psl as specified by 631 * context left by sendsig. Check carefully to 632 * make sure that the user has not modified the 633 * psl to gain improper privileges or to cause 634 * a machine fault. 635 */ 636 int 637 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 638 { 639 struct l_sigframe frame; 640 struct trapframe *regs; 641 l_sigset_t lmask; 642 sigset_t bmask; 643 int eflags; 644 ksiginfo_t ksi; 645 646 regs = td->td_frame; 647 648 #ifdef DEBUG 649 if (ldebug(sigreturn)) 650 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 651 #endif 652 /* 653 * The trampoline code hands us the sigframe. 654 * It is unsafe to keep track of it ourselves, in the event that a 655 * program jumps out of a signal handler. 656 */ 657 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 658 return (EFAULT); 659 660 /* Check for security violations. */ 661 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 662 eflags = frame.sf_sc.sc_eflags; 663 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 664 return (EINVAL); 665 666 /* 667 * Don't allow users to load a valid privileged %cs. Let the 668 * hardware check for invalid selectors, excess privilege in 669 * other selectors, invalid %eip's and invalid %esp's. 670 */ 671 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 672 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 673 ksiginfo_init_trap(&ksi); 674 ksi.ksi_signo = SIGBUS; 675 ksi.ksi_code = BUS_OBJERR; 676 ksi.ksi_trapno = T_PROTFLT; 677 ksi.ksi_addr = (void *)regs->tf_eip; 678 trapsignal(td, &ksi); 679 return (EINVAL); 680 } 681 682 lmask.__mask = frame.sf_sc.sc_mask; 683 linux_to_bsd_sigset(&lmask, &bmask); 684 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 685 686 /* Restore signal context. */ 687 /* %gs was restored by the trampoline. */ 688 regs->tf_fs = frame.sf_sc.sc_fs; 689 regs->tf_es = frame.sf_sc.sc_es; 690 regs->tf_ds = frame.sf_sc.sc_ds; 691 regs->tf_edi = frame.sf_sc.sc_edi; 692 regs->tf_esi = frame.sf_sc.sc_esi; 693 regs->tf_ebp = frame.sf_sc.sc_ebp; 694 regs->tf_ebx = frame.sf_sc.sc_ebx; 695 regs->tf_edx = frame.sf_sc.sc_edx; 696 regs->tf_ecx = frame.sf_sc.sc_ecx; 697 regs->tf_eax = frame.sf_sc.sc_eax; 698 regs->tf_eip = frame.sf_sc.sc_eip; 699 regs->tf_cs = frame.sf_sc.sc_cs; 700 regs->tf_eflags = eflags; 701 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 702 regs->tf_ss = frame.sf_sc.sc_ss; 703 704 return (EJUSTRETURN); 705 } 706 707 /* 708 * System call to cleanup state after a signal 709 * has been taken. Reset signal mask and 710 * stack state from context left by rt_sendsig (above). 711 * Return to previous pc and psl as specified by 712 * context left by sendsig. Check carefully to 713 * make sure that the user has not modified the 714 * psl to gain improper privileges or to cause 715 * a machine fault. 716 */ 717 int 718 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 719 { 720 struct l_ucontext uc; 721 struct l_sigcontext *context; 722 sigset_t bmask; 723 l_stack_t *lss; 724 stack_t ss; 725 struct trapframe *regs; 726 int eflags; 727 ksiginfo_t ksi; 728 729 regs = td->td_frame; 730 731 #ifdef DEBUG 732 if (ldebug(rt_sigreturn)) 733 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 734 #endif 735 /* 736 * The trampoline code hands us the ucontext. 737 * It is unsafe to keep track of it ourselves, in the event that a 738 * program jumps out of a signal handler. 739 */ 740 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 741 return (EFAULT); 742 743 context = &uc.uc_mcontext; 744 745 /* Check for security violations. */ 746 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 747 eflags = context->sc_eflags; 748 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 749 return (EINVAL); 750 751 /* 752 * Don't allow users to load a valid privileged %cs. Let the 753 * hardware check for invalid selectors, excess privilege in 754 * other selectors, invalid %eip's and invalid %esp's. 755 */ 756 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 757 if (!CS_SECURE(context->sc_cs)) { 758 ksiginfo_init_trap(&ksi); 759 ksi.ksi_signo = SIGBUS; 760 ksi.ksi_code = BUS_OBJERR; 761 ksi.ksi_trapno = T_PROTFLT; 762 ksi.ksi_addr = (void *)regs->tf_eip; 763 trapsignal(td, &ksi); 764 return (EINVAL); 765 } 766 767 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 768 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 769 770 /* Restore signal context. */ 771 /* %gs was restored by the trampoline. */ 772 regs->tf_fs = context->sc_fs; 773 regs->tf_es = context->sc_es; 774 regs->tf_ds = context->sc_ds; 775 regs->tf_edi = context->sc_edi; 776 regs->tf_esi = context->sc_esi; 777 regs->tf_ebp = context->sc_ebp; 778 regs->tf_ebx = context->sc_ebx; 779 regs->tf_edx = context->sc_edx; 780 regs->tf_ecx = context->sc_ecx; 781 regs->tf_eax = context->sc_eax; 782 regs->tf_eip = context->sc_eip; 783 regs->tf_cs = context->sc_cs; 784 regs->tf_eflags = eflags; 785 regs->tf_esp = context->sc_esp_at_signal; 786 regs->tf_ss = context->sc_ss; 787 788 /* Call sigaltstack & ignore results. */ 789 lss = &uc.uc_stack; 790 ss.ss_sp = lss->ss_sp; 791 ss.ss_size = lss->ss_size; 792 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 793 794 #ifdef DEBUG 795 if (ldebug(rt_sigreturn)) 796 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 797 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 798 #endif 799 (void)kern_sigaltstack(td, &ss, NULL); 800 801 return (EJUSTRETURN); 802 } 803 804 static int 805 linux_fetch_syscall_args(struct thread *td) 806 { 807 struct proc *p; 808 struct trapframe *frame; 809 struct syscall_args *sa; 810 811 p = td->td_proc; 812 frame = td->td_frame; 813 sa = &td->td_sa; 814 815 sa->code = frame->tf_eax; 816 sa->args[0] = frame->tf_ebx; 817 sa->args[1] = frame->tf_ecx; 818 sa->args[2] = frame->tf_edx; 819 sa->args[3] = frame->tf_esi; 820 sa->args[4] = frame->tf_edi; 821 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 822 823 if (sa->code >= p->p_sysent->sv_size) 824 /* nosys */ 825 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 826 else 827 sa->callp = &p->p_sysent->sv_table[sa->code]; 828 sa->narg = sa->callp->sy_narg; 829 830 td->td_retval[0] = 0; 831 td->td_retval[1] = frame->tf_edx; 832 833 return (0); 834 } 835 836 /* 837 * If a Linux binary is exec'ing something, try this image activator 838 * first. We override standard shell script execution in order to 839 * be able to modify the interpreter path. We only do this if a Linux 840 * binary is doing the exec, so we do not create an EXEC module for it. 841 */ 842 static int exec_linux_imgact_try(struct image_params *iparams); 843 844 static int 845 exec_linux_imgact_try(struct image_params *imgp) 846 { 847 const char *head = (const char *)imgp->image_header; 848 char *rpath; 849 int error = -1; 850 851 /* 852 * The interpreter for shell scripts run from a Linux binary needs 853 * to be located in /compat/linux if possible in order to recursively 854 * maintain Linux path emulation. 855 */ 856 if (((const short *)head)[0] == SHELLMAGIC) { 857 /* 858 * Run our normal shell image activator. If it succeeds attempt 859 * to use the alternate path for the interpreter. If an alternate 860 * path is found, use our stringspace to store it. 861 */ 862 if ((error = exec_shell_imgact(imgp)) == 0) { 863 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 864 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 865 if (rpath != NULL) 866 imgp->args->fname_buf = 867 imgp->interpreter_name = rpath; 868 } 869 } 870 return (error); 871 } 872 873 /* 874 * exec_setregs may initialize some registers differently than Linux 875 * does, thus potentially confusing Linux binaries. If necessary, we 876 * override the exec_setregs default(s) here. 877 */ 878 static void 879 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 880 { 881 struct pcb *pcb = td->td_pcb; 882 883 exec_setregs(td, imgp, stack); 884 885 /* Linux sets %gs to 0, we default to _udatasel. */ 886 pcb->pcb_gs = 0; 887 load_gs(0); 888 889 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 890 } 891 892 static void 893 linux_get_machine(const char **dst) 894 { 895 896 switch (cpu_class) { 897 case CPUCLASS_686: 898 *dst = "i686"; 899 break; 900 case CPUCLASS_586: 901 *dst = "i586"; 902 break; 903 case CPUCLASS_486: 904 *dst = "i486"; 905 break; 906 default: 907 *dst = "i386"; 908 } 909 } 910 911 struct sysentvec linux_sysvec = { 912 .sv_size = LINUX_SYS_MAXSYSCALL, 913 .sv_table = linux_sysent, 914 .sv_mask = 0, 915 .sv_errsize = ELAST + 1, 916 .sv_errtbl = bsd_to_linux_errno, 917 .sv_transtrap = translate_traps, 918 .sv_fixup = linux_fixup, 919 .sv_sendsig = linux_sendsig, 920 .sv_sigcode = &_binary_linux_locore_o_start, 921 .sv_szsigcode = &linux_szsigcode, 922 .sv_name = "Linux a.out", 923 .sv_coredump = NULL, 924 .sv_imgact_try = exec_linux_imgact_try, 925 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 926 .sv_pagesize = PAGE_SIZE, 927 .sv_minuser = VM_MIN_ADDRESS, 928 .sv_maxuser = VM_MAXUSER_ADDRESS, 929 .sv_usrstack = LINUX_USRSTACK, 930 .sv_psstrings = PS_STRINGS, 931 .sv_stackprot = VM_PROT_ALL, 932 .sv_copyout_strings = exec_copyout_strings, 933 .sv_setregs = exec_linux_setregs, 934 .sv_fixlimit = NULL, 935 .sv_maxssiz = NULL, 936 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 937 .sv_set_syscall_retval = cpu_set_syscall_retval, 938 .sv_fetch_syscall_args = linux_fetch_syscall_args, 939 .sv_syscallnames = NULL, 940 .sv_shared_page_base = LINUX_SHAREDPAGE, 941 .sv_shared_page_len = PAGE_SIZE, 942 .sv_schedtail = linux_schedtail, 943 .sv_thread_detach = linux_thread_detach, 944 .sv_trap = NULL, 945 }; 946 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 947 948 struct sysentvec elf_linux_sysvec = { 949 .sv_size = LINUX_SYS_MAXSYSCALL, 950 .sv_table = linux_sysent, 951 .sv_mask = 0, 952 .sv_errsize = ELAST + 1, 953 .sv_errtbl = bsd_to_linux_errno, 954 .sv_transtrap = translate_traps, 955 .sv_fixup = elf_linux_fixup, 956 .sv_sendsig = linux_sendsig, 957 .sv_sigcode = &_binary_linux_locore_o_start, 958 .sv_szsigcode = &linux_szsigcode, 959 .sv_name = "Linux ELF", 960 .sv_coredump = elf32_coredump, 961 .sv_imgact_try = exec_linux_imgact_try, 962 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 963 .sv_pagesize = PAGE_SIZE, 964 .sv_minuser = VM_MIN_ADDRESS, 965 .sv_maxuser = VM_MAXUSER_ADDRESS, 966 .sv_usrstack = LINUX_USRSTACK, 967 .sv_psstrings = LINUX_PS_STRINGS, 968 .sv_stackprot = VM_PROT_ALL, 969 .sv_copyout_strings = linux_copyout_strings, 970 .sv_setregs = exec_linux_setregs, 971 .sv_fixlimit = NULL, 972 .sv_maxssiz = NULL, 973 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, 974 .sv_set_syscall_retval = cpu_set_syscall_retval, 975 .sv_fetch_syscall_args = linux_fetch_syscall_args, 976 .sv_syscallnames = NULL, 977 .sv_shared_page_base = LINUX_SHAREDPAGE, 978 .sv_shared_page_len = PAGE_SIZE, 979 .sv_schedtail = linux_schedtail, 980 .sv_thread_detach = linux_thread_detach, 981 .sv_trap = NULL, 982 }; 983 984 static void 985 linux_vdso_install(void *param) 986 { 987 988 linux_szsigcode = (&_binary_linux_locore_o_end - 989 &_binary_linux_locore_o_start); 990 991 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 992 panic("Linux invalid vdso size\n"); 993 994 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 995 996 linux_shared_page_obj = __elfN(linux_shared_page_init) 997 (&linux_shared_page_mapping); 998 999 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 1000 1001 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1002 linux_szsigcode); 1003 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1004 } 1005 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1006 (sysinit_cfunc_t)linux_vdso_install, NULL); 1007 1008 static void 1009 linux_vdso_deinstall(void *param) 1010 { 1011 1012 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1013 }; 1014 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1015 (sysinit_cfunc_t)linux_vdso_deinstall, NULL); 1016 1017 static char GNU_ABI_VENDOR[] = "GNU"; 1018 static int GNULINUX_ABI_DESC = 0; 1019 1020 static bool 1021 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1022 { 1023 const Elf32_Word *desc; 1024 uintptr_t p; 1025 1026 p = (uintptr_t)(note + 1); 1027 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1028 1029 desc = (const Elf32_Word *)p; 1030 if (desc[0] != GNULINUX_ABI_DESC) 1031 return (false); 1032 1033 /* 1034 * For Linux we encode osrel as follows (see linux_mib.c): 1035 * VVVMMMIII (version, major, minor), see linux_mib.c. 1036 */ 1037 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1038 1039 return (true); 1040 } 1041 1042 static Elf_Brandnote linux_brandnote = { 1043 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1044 .hdr.n_descsz = 16, /* XXX at least 16 */ 1045 .hdr.n_type = 1, 1046 .vendor = GNU_ABI_VENDOR, 1047 .flags = BN_TRANSLATE_OSREL, 1048 .trans_osrel = linux_trans_osrel 1049 }; 1050 1051 static Elf32_Brandinfo linux_brand = { 1052 .brand = ELFOSABI_LINUX, 1053 .machine = EM_386, 1054 .compat_3_brand = "Linux", 1055 .emul_path = "/compat/linux", 1056 .interp_path = "/lib/ld-linux.so.1", 1057 .sysvec = &elf_linux_sysvec, 1058 .interp_newpath = NULL, 1059 .brand_note = &linux_brandnote, 1060 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1061 }; 1062 1063 static Elf32_Brandinfo linux_glibc2brand = { 1064 .brand = ELFOSABI_LINUX, 1065 .machine = EM_386, 1066 .compat_3_brand = "Linux", 1067 .emul_path = "/compat/linux", 1068 .interp_path = "/lib/ld-linux.so.2", 1069 .sysvec = &elf_linux_sysvec, 1070 .interp_newpath = NULL, 1071 .brand_note = &linux_brandnote, 1072 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1073 }; 1074 1075 static Elf32_Brandinfo linux_muslbrand = { 1076 .brand = ELFOSABI_LINUX, 1077 .machine = EM_386, 1078 .compat_3_brand = "Linux", 1079 .emul_path = "/compat/linux", 1080 .interp_path = "/lib/ld-musl-i386.so.1", 1081 .sysvec = &elf_linux_sysvec, 1082 .interp_newpath = NULL, 1083 .brand_note = &linux_brandnote, 1084 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1085 }; 1086 1087 Elf32_Brandinfo *linux_brandlist[] = { 1088 &linux_brand, 1089 &linux_glibc2brand, 1090 &linux_muslbrand, 1091 NULL 1092 }; 1093 1094 static int 1095 linux_elf_modevent(module_t mod, int type, void *data) 1096 { 1097 Elf32_Brandinfo **brandinfo; 1098 int error; 1099 struct linux_ioctl_handler **lihp; 1100 1101 error = 0; 1102 1103 switch(type) { 1104 case MOD_LOAD: 1105 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1106 ++brandinfo) 1107 if (elf32_insert_brand_entry(*brandinfo) < 0) 1108 error = EINVAL; 1109 if (error == 0) { 1110 SET_FOREACH(lihp, linux_ioctl_handler_set) 1111 linux_ioctl_register_handler(*lihp); 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_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1117 NULL, 1000); 1118 linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, 1119 linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); 1120 linux_get_machine(&linux_kplatform); 1121 linux_szplatform = roundup(strlen(linux_kplatform) + 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 mtx_destroy(&futex_mtx); 1145 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1146 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1147 EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); 1148 linux_osd_jail_deregister(); 1149 if (bootverbose) 1150 printf("Linux ELF exec handler removed\n"); 1151 } else 1152 printf("Could not deinstall ELF interpreter entry\n"); 1153 break; 1154 default: 1155 return (EOPNOTSUPP); 1156 } 1157 return (error); 1158 } 1159 1160 static moduledata_t linux_elf_mod = { 1161 "linuxelf", 1162 linux_elf_modevent, 1163 0 1164 }; 1165 1166 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1167 FEATURE(linux, "Linux 32bit support"); 1168