1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * in this position and unchanged. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/exec.h> 37 #include <sys/fcntl.h> 38 #include <sys/imgact.h> 39 #include <sys/imgact_aout.h> 40 #include <sys/imgact_elf.h> 41 #include <sys/kernel.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/module.h> 45 #include <sys/mutex.h> 46 #include <sys/proc.h> 47 #include <sys/signalvar.h> 48 #include <sys/syscallsubr.h> 49 #include <sys/sysctl.h> 50 #include <sys/sysent.h> 51 #include <sys/sysproto.h> 52 #include <sys/vnode.h> 53 #include <sys/eventhandler.h> 54 55 #include <vm/vm.h> 56 #include <vm/pmap.h> 57 #include <vm/vm_extern.h> 58 #include <vm/vm_map.h> 59 #include <vm/vm_object.h> 60 #include <vm/vm_page.h> 61 #include <vm/vm_param.h> 62 63 #include <machine/cpu.h> 64 #include <machine/cputypes.h> 65 #include <machine/md_var.h> 66 #include <machine/pcb.h> 67 68 #include <i386/linux/linux.h> 69 #include <i386/linux/linux_proto.h> 70 #include <compat/linux/linux_emul.h> 71 #include <compat/linux/linux_futex.h> 72 #include <compat/linux/linux_ioctl.h> 73 #include <compat/linux/linux_mib.h> 74 #include <compat/linux/linux_misc.h> 75 #include <compat/linux/linux_signal.h> 76 #include <compat/linux/linux_util.h> 77 #include <compat/linux/linux_vdso.h> 78 79 MODULE_VERSION(linux, 1); 80 81 #if BYTE_ORDER == LITTLE_ENDIAN 82 #define SHELLMAGIC 0x2123 /* #! */ 83 #else 84 #define SHELLMAGIC 0x2321 85 #endif 86 87 #if defined(DEBUG) 88 SYSCTL_PROC(_compat_linux, OID_AUTO, debug, 89 CTLTYPE_STRING | CTLFLAG_RW, 90 0, 0, linux_sysctl_debug, "A", 91 "Linux debugging control"); 92 #endif 93 94 /* 95 * Allow the sendsig functions to use the ldebug() facility 96 * even though they are not syscalls themselves. Map them 97 * to syscall 0. This is slightly less bogus than using 98 * ldebug(sigreturn). 99 */ 100 #define LINUX_SYS_linux_rt_sendsig 0 101 #define LINUX_SYS_linux_sendsig 0 102 103 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 104 105 static int linux_szsigcode; 106 static vm_object_t linux_shared_page_obj; 107 static char *linux_shared_page_mapping; 108 extern char _binary_linux_locore_o_start; 109 extern char _binary_linux_locore_o_end; 110 111 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 112 113 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 114 115 static int linux_fixup(register_t **stack_base, 116 struct image_params *iparams); 117 static int elf_linux_fixup(register_t **stack_base, 118 struct image_params *iparams); 119 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 120 static void exec_linux_setregs(struct thread *td, 121 struct image_params *imgp, u_long stack); 122 static register_t *linux_copyout_strings(struct image_params *imgp); 123 static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 124 static void linux_vdso_install(void *param); 125 static void linux_vdso_deinstall(void *param); 126 127 static int linux_szplatform; 128 const char *linux_kplatform; 129 130 static eventhandler_tag linux_exit_tag; 131 static eventhandler_tag linux_exec_tag; 132 static eventhandler_tag linux_thread_dtor_tag; 133 134 /* 135 * Linux syscalls return negative errno's, we do positive and map them 136 * Reference: 137 * FreeBSD: src/sys/sys/errno.h 138 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 139 * linux-2.6.17.8/include/asm-generic/errno.h 140 */ 141 static int bsd_to_linux_errno[ELAST + 1] = { 142 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 143 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 144 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 145 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 146 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 147 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 148 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 149 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 150 -6, -6, -43, -42, -75,-125, -84, -61, -16, -74, 151 -72, -67, -71 152 }; 153 154 #define LINUX_T_UNKNOWN 255 155 static int _bsd_to_linux_trapcode[] = { 156 LINUX_T_UNKNOWN, /* 0 */ 157 6, /* 1 T_PRIVINFLT */ 158 LINUX_T_UNKNOWN, /* 2 */ 159 3, /* 3 T_BPTFLT */ 160 LINUX_T_UNKNOWN, /* 4 */ 161 LINUX_T_UNKNOWN, /* 5 */ 162 16, /* 6 T_ARITHTRAP */ 163 254, /* 7 T_ASTFLT */ 164 LINUX_T_UNKNOWN, /* 8 */ 165 13, /* 9 T_PROTFLT */ 166 1, /* 10 T_TRCTRAP */ 167 LINUX_T_UNKNOWN, /* 11 */ 168 14, /* 12 T_PAGEFLT */ 169 LINUX_T_UNKNOWN, /* 13 */ 170 17, /* 14 T_ALIGNFLT */ 171 LINUX_T_UNKNOWN, /* 15 */ 172 LINUX_T_UNKNOWN, /* 16 */ 173 LINUX_T_UNKNOWN, /* 17 */ 174 0, /* 18 T_DIVIDE */ 175 2, /* 19 T_NMI */ 176 4, /* 20 T_OFLOW */ 177 5, /* 21 T_BOUND */ 178 7, /* 22 T_DNA */ 179 8, /* 23 T_DOUBLEFLT */ 180 9, /* 24 T_FPOPFLT */ 181 10, /* 25 T_TSSFLT */ 182 11, /* 26 T_SEGNPFLT */ 183 12, /* 27 T_STKFLT */ 184 18, /* 28 T_MCHK */ 185 19, /* 29 T_XMMFLT */ 186 15 /* 30 T_RESERVED */ 187 }; 188 #define bsd_to_linux_trapcode(code) \ 189 ((code)<nitems(_bsd_to_linux_trapcode)? \ 190 _bsd_to_linux_trapcode[(code)]: \ 191 LINUX_T_UNKNOWN) 192 193 LINUX_VDSO_SYM_INTPTR(linux_sigcode); 194 LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 195 LINUX_VDSO_SYM_INTPTR(linux_vsyscall); 196 197 /* 198 * If FreeBSD & Linux have a difference of opinion about what a trap 199 * means, deal with it here. 200 * 201 * MPSAFE 202 */ 203 static int 204 translate_traps(int signal, int trap_code) 205 { 206 if (signal != SIGBUS) 207 return (signal); 208 switch (trap_code) { 209 case T_PROTFLT: 210 case T_TSSFLT: 211 case T_DOUBLEFLT: 212 case T_PAGEFLT: 213 return (SIGSEGV); 214 default: 215 return (signal); 216 } 217 } 218 219 static int 220 linux_fixup(register_t **stack_base, struct image_params *imgp) 221 { 222 register_t *argv, *envp; 223 224 argv = *stack_base; 225 envp = *stack_base + (imgp->args->argc + 1); 226 (*stack_base)--; 227 suword(*stack_base, (intptr_t)(void *)envp); 228 (*stack_base)--; 229 suword(*stack_base, (intptr_t)(void *)argv); 230 (*stack_base)--; 231 suword(*stack_base, imgp->args->argc); 232 return (0); 233 } 234 235 static int 236 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 237 { 238 struct proc *p; 239 Elf32_Auxargs *args; 240 Elf32_Addr *uplatform; 241 struct ps_strings *arginfo; 242 register_t *pos; 243 int issetugid; 244 245 KASSERT(curthread->td_proc == imgp->proc, 246 ("unsafe elf_linux_fixup(), should be curproc")); 247 248 p = imgp->proc; 249 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 250 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 251 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); 252 args = (Elf32_Auxargs *)imgp->auxargs; 253 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 254 255 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 256 imgp->proc->p_sysent->sv_shared_page_base); 257 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); 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, issetugid); 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 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); 284 if (imgp->execpathp != 0) 285 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); 286 if (args->execfd != -1) 287 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 288 AUXARGS_ENTRY(pos, AT_NULL, 0); 289 290 free(imgp->auxargs, M_TEMP); 291 imgp->auxargs = NULL; 292 293 (*stack_base)--; 294 suword(*stack_base, (register_t)imgp->args->argc); 295 return (0); 296 } 297 298 /* 299 * Copied from kern/kern_exec.c 300 */ 301 static register_t * 302 linux_copyout_strings(struct image_params *imgp) 303 { 304 int argc, envc; 305 char **vectp; 306 char *stringp, *destp; 307 register_t *stack_base; 308 struct ps_strings *arginfo; 309 char canary[LINUX_AT_RANDOM_LEN]; 310 size_t execpath_len; 311 struct proc *p; 312 313 /* 314 * Calculate string base and vector table pointers. 315 */ 316 p = imgp->proc; 317 if (imgp->execpath != NULL && imgp->auxargs != NULL) 318 execpath_len = strlen(imgp->execpath) + 1; 319 else 320 execpath_len = 0; 321 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 322 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - 323 roundup(sizeof(canary), sizeof(char *)) - 324 roundup(execpath_len, sizeof(char *)) - 325 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 326 327 /* 328 * install LINUX_PLATFORM 329 */ 330 copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform), 331 linux_szplatform); 332 333 if (execpath_len != 0) { 334 imgp->execpathp = (uintptr_t)arginfo - 335 linux_szplatform - execpath_len; 336 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 337 } 338 339 /* 340 * Prepare the canary for SSP. 341 */ 342 arc4rand(canary, sizeof(canary), 0); 343 imgp->canary = (uintptr_t)arginfo - linux_szplatform - 344 roundup(execpath_len, sizeof(char *)) - 345 roundup(sizeof(canary), sizeof(char *)); 346 copyout(canary, (void *)imgp->canary, sizeof(canary)); 347 348 /* 349 * If we have a valid auxargs ptr, prepare some room 350 * on the stack. 351 */ 352 if (imgp->auxargs) { 353 /* 354 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 355 * lower compatibility. 356 */ 357 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 358 (LINUX_AT_COUNT * 2); 359 /* 360 * The '+ 2' is for the null pointers at the end of each of 361 * the arg and env vector sets,and imgp->auxarg_size is room 362 * for argument of Runtime loader. 363 */ 364 vectp = (char **)(destp - (imgp->args->argc + 365 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 366 } else { 367 /* 368 * The '+ 2' is for the null pointers at the end of each of 369 * the arg and env vector sets 370 */ 371 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 372 sizeof(char *)); 373 } 374 375 /* 376 * vectp also becomes our initial stack base 377 */ 378 stack_base = (register_t *)vectp; 379 380 stringp = imgp->args->begin_argv; 381 argc = imgp->args->argc; 382 envc = imgp->args->envc; 383 384 /* 385 * Copy out strings - arguments and environment. 386 */ 387 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 388 389 /* 390 * Fill in "ps_strings" struct for ps, w, etc. 391 */ 392 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 393 suword(&arginfo->ps_nargvstr, argc); 394 395 /* 396 * Fill in argument portion of vector table. 397 */ 398 for (; argc > 0; --argc) { 399 suword(vectp++, (long)(intptr_t)destp); 400 while (*stringp++ != 0) 401 destp++; 402 destp++; 403 } 404 405 /* a null vector table pointer separates the argp's from the envp's */ 406 suword(vectp++, 0); 407 408 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 409 suword(&arginfo->ps_nenvstr, envc); 410 411 /* 412 * Fill in environment portion of vector table. 413 */ 414 for (; envc > 0; --envc) { 415 suword(vectp++, (long)(intptr_t)destp); 416 while (*stringp++ != 0) 417 destp++; 418 destp++; 419 } 420 421 /* end of vector table is a null pointer */ 422 suword(vectp, 0); 423 424 return (stack_base); 425 } 426 427 static void 428 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 429 { 430 struct thread *td = curthread; 431 struct proc *p = td->td_proc; 432 struct sigacts *psp; 433 struct trapframe *regs; 434 struct l_rt_sigframe *fp, frame; 435 int sig, code; 436 int oonstack; 437 438 sig = ksi->ksi_signo; 439 code = ksi->ksi_code; 440 PROC_LOCK_ASSERT(p, MA_OWNED); 441 psp = p->p_sigacts; 442 mtx_assert(&psp->ps_mtx, MA_OWNED); 443 regs = td->td_frame; 444 oonstack = sigonstack(regs->tf_esp); 445 446 #ifdef DEBUG 447 if (ldebug(rt_sendsig)) 448 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 449 catcher, sig, (void*)mask, code); 450 #endif 451 /* 452 * Allocate space for the signal handler context. 453 */ 454 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 455 SIGISMEMBER(psp->ps_sigonstack, sig)) { 456 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 457 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 458 } else 459 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 460 mtx_unlock(&psp->ps_mtx); 461 462 /* 463 * Build the argument list for the signal handler. 464 */ 465 sig = bsd_to_linux_signal(sig); 466 467 bzero(&frame, sizeof(frame)); 468 469 frame.sf_handler = catcher; 470 frame.sf_sig = sig; 471 frame.sf_siginfo = &fp->sf_si; 472 frame.sf_ucontext = &fp->sf_sc; 473 474 /* Fill in POSIX parts */ 475 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 476 477 /* 478 * Build the signal context to be used by sigreturn. 479 */ 480 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 481 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 482 483 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 484 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 485 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 486 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 487 PROC_UNLOCK(p); 488 489 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 490 491 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 492 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 493 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 494 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 495 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 496 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 497 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 498 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 499 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 500 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 501 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 502 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 503 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 504 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 505 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 506 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 507 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 508 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 509 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 510 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 511 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 512 513 #ifdef DEBUG 514 if (ldebug(rt_sendsig)) 515 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 516 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 517 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 518 #endif 519 520 if (copyout(&frame, fp, sizeof(frame)) != 0) { 521 /* 522 * Process has trashed its stack; give it an illegal 523 * instruction to halt it in its tracks. 524 */ 525 #ifdef DEBUG 526 if (ldebug(rt_sendsig)) 527 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 528 fp, oonstack); 529 #endif 530 PROC_LOCK(p); 531 sigexit(td, SIGILL); 532 } 533 534 /* 535 * Build context to run handler in. 536 */ 537 regs->tf_esp = (int)fp; 538 regs->tf_eip = linux_rt_sigcode; 539 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 540 regs->tf_cs = _ucodesel; 541 regs->tf_ds = _udatasel; 542 regs->tf_es = _udatasel; 543 regs->tf_fs = _udatasel; 544 regs->tf_ss = _udatasel; 545 PROC_LOCK(p); 546 mtx_lock(&psp->ps_mtx); 547 } 548 549 550 /* 551 * Send an interrupt to process. 552 * 553 * Stack is set up to allow sigcode stored 554 * in u. to call routine, followed by kcall 555 * to sigreturn routine below. After sigreturn 556 * resets the signal mask, the stack, and the 557 * frame pointer, it returns to the user 558 * specified pc, psl. 559 */ 560 static void 561 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 562 { 563 struct thread *td = curthread; 564 struct proc *p = td->td_proc; 565 struct sigacts *psp; 566 struct trapframe *regs; 567 struct l_sigframe *fp, frame; 568 l_sigset_t lmask; 569 int sig, code; 570 int oonstack; 571 572 PROC_LOCK_ASSERT(p, MA_OWNED); 573 psp = p->p_sigacts; 574 sig = ksi->ksi_signo; 575 code = ksi->ksi_code; 576 mtx_assert(&psp->ps_mtx, MA_OWNED); 577 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 578 /* Signal handler installed with SA_SIGINFO. */ 579 linux_rt_sendsig(catcher, ksi, mask); 580 return; 581 } 582 regs = td->td_frame; 583 oonstack = sigonstack(regs->tf_esp); 584 585 #ifdef DEBUG 586 if (ldebug(sendsig)) 587 printf(ARGS(sendsig, "%p, %d, %p, %u"), 588 catcher, sig, (void*)mask, code); 589 #endif 590 591 /* 592 * Allocate space for the signal handler context. 593 */ 594 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 595 SIGISMEMBER(psp->ps_sigonstack, sig)) { 596 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 597 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 598 } else 599 fp = (struct l_sigframe *)regs->tf_esp - 1; 600 mtx_unlock(&psp->ps_mtx); 601 PROC_UNLOCK(p); 602 603 /* 604 * Build the argument list for the signal handler. 605 */ 606 sig = bsd_to_linux_signal(sig); 607 608 bzero(&frame, sizeof(frame)); 609 610 frame.sf_handler = catcher; 611 frame.sf_sig = sig; 612 613 bsd_to_linux_sigset(mask, &lmask); 614 615 /* 616 * Build the signal context to be used by sigreturn. 617 */ 618 frame.sf_sc.sc_mask = lmask.__mask; 619 frame.sf_sc.sc_gs = rgs(); 620 frame.sf_sc.sc_fs = regs->tf_fs; 621 frame.sf_sc.sc_es = regs->tf_es; 622 frame.sf_sc.sc_ds = regs->tf_ds; 623 frame.sf_sc.sc_edi = regs->tf_edi; 624 frame.sf_sc.sc_esi = regs->tf_esi; 625 frame.sf_sc.sc_ebp = regs->tf_ebp; 626 frame.sf_sc.sc_ebx = regs->tf_ebx; 627 frame.sf_sc.sc_esp = regs->tf_esp; 628 frame.sf_sc.sc_edx = regs->tf_edx; 629 frame.sf_sc.sc_ecx = regs->tf_ecx; 630 frame.sf_sc.sc_eax = regs->tf_eax; 631 frame.sf_sc.sc_eip = regs->tf_eip; 632 frame.sf_sc.sc_cs = regs->tf_cs; 633 frame.sf_sc.sc_eflags = regs->tf_eflags; 634 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 635 frame.sf_sc.sc_ss = regs->tf_ss; 636 frame.sf_sc.sc_err = regs->tf_err; 637 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 638 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 639 640 frame.sf_extramask[0] = lmask.__mask; 641 642 if (copyout(&frame, fp, sizeof(frame)) != 0) { 643 /* 644 * Process has trashed its stack; give it an illegal 645 * instruction to halt it in its tracks. 646 */ 647 PROC_LOCK(p); 648 sigexit(td, SIGILL); 649 } 650 651 /* 652 * Build context to run handler in. 653 */ 654 regs->tf_esp = (int)fp; 655 regs->tf_eip = linux_sigcode; 656 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 657 regs->tf_cs = _ucodesel; 658 regs->tf_ds = _udatasel; 659 regs->tf_es = _udatasel; 660 regs->tf_fs = _udatasel; 661 regs->tf_ss = _udatasel; 662 PROC_LOCK(p); 663 mtx_lock(&psp->ps_mtx); 664 } 665 666 /* 667 * System call to cleanup state after a signal 668 * has been taken. Reset signal mask and 669 * stack state from context left by sendsig (above). 670 * Return to previous pc and psl as specified by 671 * context left by sendsig. Check carefully to 672 * make sure that the user has not modified the 673 * psl to gain improper privileges or to cause 674 * a machine fault. 675 */ 676 int 677 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 678 { 679 struct l_sigframe frame; 680 struct trapframe *regs; 681 l_sigset_t lmask; 682 sigset_t bmask; 683 int eflags; 684 ksiginfo_t ksi; 685 686 regs = td->td_frame; 687 688 #ifdef DEBUG 689 if (ldebug(sigreturn)) 690 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 691 #endif 692 /* 693 * The trampoline code hands us the sigframe. 694 * It is unsafe to keep track of it ourselves, in the event that a 695 * program jumps out of a signal handler. 696 */ 697 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 698 return (EFAULT); 699 700 /* 701 * Check for security violations. 702 */ 703 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 704 eflags = frame.sf_sc.sc_eflags; 705 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 706 return (EINVAL); 707 708 /* 709 * Don't allow users to load a valid privileged %cs. Let the 710 * hardware check for invalid selectors, excess privilege in 711 * other selectors, invalid %eip's and invalid %esp's. 712 */ 713 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 714 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 715 ksiginfo_init_trap(&ksi); 716 ksi.ksi_signo = SIGBUS; 717 ksi.ksi_code = BUS_OBJERR; 718 ksi.ksi_trapno = T_PROTFLT; 719 ksi.ksi_addr = (void *)regs->tf_eip; 720 trapsignal(td, &ksi); 721 return (EINVAL); 722 } 723 724 lmask.__mask = frame.sf_sc.sc_mask; 725 linux_to_bsd_sigset(&lmask, &bmask); 726 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 727 728 /* 729 * Restore signal context. 730 */ 731 /* %gs was restored by the trampoline. */ 732 regs->tf_fs = frame.sf_sc.sc_fs; 733 regs->tf_es = frame.sf_sc.sc_es; 734 regs->tf_ds = frame.sf_sc.sc_ds; 735 regs->tf_edi = frame.sf_sc.sc_edi; 736 regs->tf_esi = frame.sf_sc.sc_esi; 737 regs->tf_ebp = frame.sf_sc.sc_ebp; 738 regs->tf_ebx = frame.sf_sc.sc_ebx; 739 regs->tf_edx = frame.sf_sc.sc_edx; 740 regs->tf_ecx = frame.sf_sc.sc_ecx; 741 regs->tf_eax = frame.sf_sc.sc_eax; 742 regs->tf_eip = frame.sf_sc.sc_eip; 743 regs->tf_cs = frame.sf_sc.sc_cs; 744 regs->tf_eflags = eflags; 745 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 746 regs->tf_ss = frame.sf_sc.sc_ss; 747 748 return (EJUSTRETURN); 749 } 750 751 /* 752 * System call to cleanup state after a signal 753 * has been taken. Reset signal mask and 754 * stack state from context left by rt_sendsig (above). 755 * Return to previous pc and psl as specified by 756 * context left by sendsig. Check carefully to 757 * make sure that the user has not modified the 758 * psl to gain improper privileges or to cause 759 * a machine fault. 760 */ 761 int 762 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 763 { 764 struct l_ucontext uc; 765 struct l_sigcontext *context; 766 sigset_t bmask; 767 l_stack_t *lss; 768 stack_t ss; 769 struct trapframe *regs; 770 int eflags; 771 ksiginfo_t ksi; 772 773 regs = td->td_frame; 774 775 #ifdef DEBUG 776 if (ldebug(rt_sigreturn)) 777 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 778 #endif 779 /* 780 * The trampoline code hands us the ucontext. 781 * It is unsafe to keep track of it ourselves, in the event that a 782 * program jumps out of a signal handler. 783 */ 784 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 785 return (EFAULT); 786 787 context = &uc.uc_mcontext; 788 789 /* 790 * Check for security violations. 791 */ 792 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 793 eflags = context->sc_eflags; 794 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 795 return (EINVAL); 796 797 /* 798 * Don't allow users to load a valid privileged %cs. Let the 799 * hardware check for invalid selectors, excess privilege in 800 * other selectors, invalid %eip's and invalid %esp's. 801 */ 802 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 803 if (!CS_SECURE(context->sc_cs)) { 804 ksiginfo_init_trap(&ksi); 805 ksi.ksi_signo = SIGBUS; 806 ksi.ksi_code = BUS_OBJERR; 807 ksi.ksi_trapno = T_PROTFLT; 808 ksi.ksi_addr = (void *)regs->tf_eip; 809 trapsignal(td, &ksi); 810 return (EINVAL); 811 } 812 813 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 814 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 815 816 /* 817 * Restore signal context 818 */ 819 /* %gs was restored by the trampoline. */ 820 regs->tf_fs = context->sc_fs; 821 regs->tf_es = context->sc_es; 822 regs->tf_ds = context->sc_ds; 823 regs->tf_edi = context->sc_edi; 824 regs->tf_esi = context->sc_esi; 825 regs->tf_ebp = context->sc_ebp; 826 regs->tf_ebx = context->sc_ebx; 827 regs->tf_edx = context->sc_edx; 828 regs->tf_ecx = context->sc_ecx; 829 regs->tf_eax = context->sc_eax; 830 regs->tf_eip = context->sc_eip; 831 regs->tf_cs = context->sc_cs; 832 regs->tf_eflags = eflags; 833 regs->tf_esp = context->sc_esp_at_signal; 834 regs->tf_ss = context->sc_ss; 835 836 /* 837 * call sigaltstack & ignore results.. 838 */ 839 lss = &uc.uc_stack; 840 ss.ss_sp = lss->ss_sp; 841 ss.ss_size = lss->ss_size; 842 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 843 844 #ifdef DEBUG 845 if (ldebug(rt_sigreturn)) 846 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 847 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 848 #endif 849 (void)kern_sigaltstack(td, &ss, NULL); 850 851 return (EJUSTRETURN); 852 } 853 854 static int 855 linux_fetch_syscall_args(struct thread *td) 856 { 857 struct proc *p; 858 struct trapframe *frame; 859 struct syscall_args *sa; 860 861 p = td->td_proc; 862 frame = td->td_frame; 863 sa = &td->td_sa; 864 865 sa->code = frame->tf_eax; 866 sa->args[0] = frame->tf_ebx; 867 sa->args[1] = frame->tf_ecx; 868 sa->args[2] = frame->tf_edx; 869 sa->args[3] = frame->tf_esi; 870 sa->args[4] = frame->tf_edi; 871 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 872 873 if (sa->code >= p->p_sysent->sv_size) 874 /* nosys */ 875 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 876 else 877 sa->callp = &p->p_sysent->sv_table[sa->code]; 878 sa->narg = sa->callp->sy_narg; 879 880 td->td_retval[0] = 0; 881 td->td_retval[1] = frame->tf_edx; 882 883 return (0); 884 } 885 886 /* 887 * If a linux binary is exec'ing something, try this image activator 888 * first. We override standard shell script execution in order to 889 * be able to modify the interpreter path. We only do this if a linux 890 * binary is doing the exec, so we do not create an EXEC module for it. 891 */ 892 static int exec_linux_imgact_try(struct image_params *iparams); 893 894 static int 895 exec_linux_imgact_try(struct image_params *imgp) 896 { 897 const char *head = (const char *)imgp->image_header; 898 char *rpath; 899 int error = -1; 900 901 /* 902 * The interpreter for shell scripts run from a linux binary needs 903 * to be located in /compat/linux if possible in order to recursively 904 * maintain linux path emulation. 905 */ 906 if (((const short *)head)[0] == SHELLMAGIC) { 907 /* 908 * Run our normal shell image activator. If it succeeds attempt 909 * to use the alternate path for the interpreter. If an alternate 910 * path is found, use our stringspace to store it. 911 */ 912 if ((error = exec_shell_imgact(imgp)) == 0) { 913 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 914 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 915 if (rpath != NULL) 916 imgp->args->fname_buf = 917 imgp->interpreter_name = rpath; 918 } 919 } 920 return (error); 921 } 922 923 /* 924 * exec_setregs may initialize some registers differently than Linux 925 * does, thus potentially confusing Linux binaries. If necessary, we 926 * override the exec_setregs default(s) here. 927 */ 928 static void 929 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 930 { 931 struct pcb *pcb = td->td_pcb; 932 933 exec_setregs(td, imgp, stack); 934 935 /* Linux sets %gs to 0, we default to _udatasel */ 936 pcb->pcb_gs = 0; 937 load_gs(0); 938 939 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 940 } 941 942 static void 943 linux_get_machine(const char **dst) 944 { 945 946 switch (cpu_class) { 947 case CPUCLASS_686: 948 *dst = "i686"; 949 break; 950 case CPUCLASS_586: 951 *dst = "i586"; 952 break; 953 case CPUCLASS_486: 954 *dst = "i486"; 955 break; 956 default: 957 *dst = "i386"; 958 } 959 } 960 961 struct sysentvec linux_sysvec = { 962 .sv_size = LINUX_SYS_MAXSYSCALL, 963 .sv_table = linux_sysent, 964 .sv_mask = 0, 965 .sv_errsize = ELAST + 1, 966 .sv_errtbl = bsd_to_linux_errno, 967 .sv_transtrap = translate_traps, 968 .sv_fixup = linux_fixup, 969 .sv_sendsig = linux_sendsig, 970 .sv_sigcode = &_binary_linux_locore_o_start, 971 .sv_szsigcode = &linux_szsigcode, 972 .sv_name = "Linux a.out", 973 .sv_coredump = NULL, 974 .sv_imgact_try = exec_linux_imgact_try, 975 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 976 .sv_pagesize = PAGE_SIZE, 977 .sv_minuser = VM_MIN_ADDRESS, 978 .sv_maxuser = VM_MAXUSER_ADDRESS, 979 .sv_usrstack = LINUX_USRSTACK, 980 .sv_psstrings = PS_STRINGS, 981 .sv_stackprot = VM_PROT_ALL, 982 .sv_copyout_strings = exec_copyout_strings, 983 .sv_setregs = exec_linux_setregs, 984 .sv_fixlimit = NULL, 985 .sv_maxssiz = NULL, 986 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 987 .sv_set_syscall_retval = cpu_set_syscall_retval, 988 .sv_fetch_syscall_args = linux_fetch_syscall_args, 989 .sv_syscallnames = NULL, 990 .sv_shared_page_base = LINUX_SHAREDPAGE, 991 .sv_shared_page_len = PAGE_SIZE, 992 .sv_schedtail = linux_schedtail, 993 .sv_thread_detach = linux_thread_detach, 994 .sv_trap = NULL, 995 }; 996 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 997 998 struct sysentvec elf_linux_sysvec = { 999 .sv_size = LINUX_SYS_MAXSYSCALL, 1000 .sv_table = linux_sysent, 1001 .sv_mask = 0, 1002 .sv_errsize = ELAST + 1, 1003 .sv_errtbl = bsd_to_linux_errno, 1004 .sv_transtrap = translate_traps, 1005 .sv_fixup = elf_linux_fixup, 1006 .sv_sendsig = linux_sendsig, 1007 .sv_sigcode = &_binary_linux_locore_o_start, 1008 .sv_szsigcode = &linux_szsigcode, 1009 .sv_name = "Linux ELF", 1010 .sv_coredump = elf32_coredump, 1011 .sv_imgact_try = exec_linux_imgact_try, 1012 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1013 .sv_pagesize = PAGE_SIZE, 1014 .sv_minuser = VM_MIN_ADDRESS, 1015 .sv_maxuser = VM_MAXUSER_ADDRESS, 1016 .sv_usrstack = LINUX_USRSTACK, 1017 .sv_psstrings = LINUX_PS_STRINGS, 1018 .sv_stackprot = VM_PROT_ALL, 1019 .sv_copyout_strings = linux_copyout_strings, 1020 .sv_setregs = exec_linux_setregs, 1021 .sv_fixlimit = NULL, 1022 .sv_maxssiz = NULL, 1023 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, 1024 .sv_set_syscall_retval = cpu_set_syscall_retval, 1025 .sv_fetch_syscall_args = linux_fetch_syscall_args, 1026 .sv_syscallnames = NULL, 1027 .sv_shared_page_base = LINUX_SHAREDPAGE, 1028 .sv_shared_page_len = PAGE_SIZE, 1029 .sv_schedtail = linux_schedtail, 1030 .sv_thread_detach = linux_thread_detach, 1031 .sv_trap = NULL, 1032 }; 1033 1034 static void 1035 linux_vdso_install(void *param) 1036 { 1037 1038 linux_szsigcode = (&_binary_linux_locore_o_end - 1039 &_binary_linux_locore_o_start); 1040 1041 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 1042 panic("Linux invalid vdso size\n"); 1043 1044 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 1045 1046 linux_shared_page_obj = __elfN(linux_shared_page_init) 1047 (&linux_shared_page_mapping); 1048 1049 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 1050 1051 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1052 linux_szsigcode); 1053 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1054 } 1055 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1056 (sysinit_cfunc_t)linux_vdso_install, NULL); 1057 1058 static void 1059 linux_vdso_deinstall(void *param) 1060 { 1061 1062 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1063 }; 1064 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1065 (sysinit_cfunc_t)linux_vdso_deinstall, NULL); 1066 1067 static char GNU_ABI_VENDOR[] = "GNU"; 1068 static int GNULINUX_ABI_DESC = 0; 1069 1070 static boolean_t 1071 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1072 { 1073 const Elf32_Word *desc; 1074 uintptr_t p; 1075 1076 p = (uintptr_t)(note + 1); 1077 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1078 1079 desc = (const Elf32_Word *)p; 1080 if (desc[0] != GNULINUX_ABI_DESC) 1081 return (FALSE); 1082 1083 /* 1084 * For linux we encode osrel as follows (see linux_mib.c): 1085 * VVVMMMIII (version, major, minor), see linux_mib.c. 1086 */ 1087 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1088 1089 return (TRUE); 1090 } 1091 1092 static Elf_Brandnote linux_brandnote = { 1093 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1094 .hdr.n_descsz = 16, /* XXX at least 16 */ 1095 .hdr.n_type = 1, 1096 .vendor = GNU_ABI_VENDOR, 1097 .flags = BN_TRANSLATE_OSREL, 1098 .trans_osrel = linux_trans_osrel 1099 }; 1100 1101 static Elf32_Brandinfo linux_brand = { 1102 .brand = ELFOSABI_LINUX, 1103 .machine = EM_386, 1104 .compat_3_brand = "Linux", 1105 .emul_path = "/compat/linux", 1106 .interp_path = "/lib/ld-linux.so.1", 1107 .sysvec = &elf_linux_sysvec, 1108 .interp_newpath = NULL, 1109 .brand_note = &linux_brandnote, 1110 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1111 }; 1112 1113 static Elf32_Brandinfo linux_glibc2brand = { 1114 .brand = ELFOSABI_LINUX, 1115 .machine = EM_386, 1116 .compat_3_brand = "Linux", 1117 .emul_path = "/compat/linux", 1118 .interp_path = "/lib/ld-linux.so.2", 1119 .sysvec = &elf_linux_sysvec, 1120 .interp_newpath = NULL, 1121 .brand_note = &linux_brandnote, 1122 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1123 }; 1124 1125 static Elf32_Brandinfo linux_muslbrand = { 1126 .brand = ELFOSABI_LINUX, 1127 .machine = EM_386, 1128 .compat_3_brand = "Linux", 1129 .emul_path = "/compat/linux", 1130 .interp_path = "/lib/ld-musl-i386.so.1", 1131 .sysvec = &elf_linux_sysvec, 1132 .interp_newpath = NULL, 1133 .brand_note = &linux_brandnote, 1134 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1135 }; 1136 1137 Elf32_Brandinfo *linux_brandlist[] = { 1138 &linux_brand, 1139 &linux_glibc2brand, 1140 &linux_muslbrand, 1141 NULL 1142 }; 1143 1144 static int 1145 linux_elf_modevent(module_t mod, int type, void *data) 1146 { 1147 Elf32_Brandinfo **brandinfo; 1148 int error; 1149 struct linux_ioctl_handler **lihp; 1150 1151 error = 0; 1152 1153 switch(type) { 1154 case MOD_LOAD: 1155 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1156 ++brandinfo) 1157 if (elf32_insert_brand_entry(*brandinfo) < 0) 1158 error = EINVAL; 1159 if (error == 0) { 1160 SET_FOREACH(lihp, linux_ioctl_handler_set) 1161 linux_ioctl_register_handler(*lihp); 1162 LIST_INIT(&futex_list); 1163 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1164 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1165 NULL, 1000); 1166 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1167 NULL, 1000); 1168 linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, 1169 linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); 1170 linux_get_machine(&linux_kplatform); 1171 linux_szplatform = roundup(strlen(linux_kplatform) + 1, 1172 sizeof(char *)); 1173 linux_osd_jail_register(); 1174 stclohz = (stathz ? stathz : hz); 1175 if (bootverbose) 1176 printf("Linux ELF exec handler installed\n"); 1177 } else 1178 printf("cannot insert Linux ELF brand handler\n"); 1179 break; 1180 case MOD_UNLOAD: 1181 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1182 ++brandinfo) 1183 if (elf32_brand_inuse(*brandinfo)) 1184 error = EBUSY; 1185 if (error == 0) { 1186 for (brandinfo = &linux_brandlist[0]; 1187 *brandinfo != NULL; ++brandinfo) 1188 if (elf32_remove_brand_entry(*brandinfo) < 0) 1189 error = EINVAL; 1190 } 1191 if (error == 0) { 1192 SET_FOREACH(lihp, linux_ioctl_handler_set) 1193 linux_ioctl_unregister_handler(*lihp); 1194 mtx_destroy(&futex_mtx); 1195 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1196 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1197 EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); 1198 linux_osd_jail_deregister(); 1199 if (bootverbose) 1200 printf("Linux ELF exec handler removed\n"); 1201 } else 1202 printf("Could not deinstall ELF interpreter entry\n"); 1203 break; 1204 default: 1205 return (EOPNOTSUPP); 1206 } 1207 return (error); 1208 } 1209 1210 static moduledata_t linux_elf_mod = { 1211 "linuxelf", 1212 linux_elf_modevent, 1213 0 1214 }; 1215 1216 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1217 FEATURE(linux, "Linux 32bit support"); 1218