linux_sysvec.c revision 337024
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 337024 2018-08-01 00:41:02Z jhb $"); 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, 87 CTLTYPE_STRING | CTLFLAG_RW, 88 0, 0, linux_sysctl_debug, "A", 89 "Linux debugging control"); 90#endif 91 92/* 93 * Allow the sendsig functions to use the ldebug() facility even though they 94 * are not syscalls themselves. Map them to syscall 0. This is slightly less 95 * bogus than using ldebug(sigreturn). 96 */ 97#define LINUX_SYS_linux_rt_sendsig 0 98#define LINUX_SYS_linux_sendsig 0 99 100#define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 101 102static int linux_szsigcode; 103static vm_object_t linux_shared_page_obj; 104static char *linux_shared_page_mapping; 105extern char _binary_linux_locore_o_start; 106extern char _binary_linux_locore_o_end; 107 108extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 109 110SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 111 112static int linux_fixup(register_t **stack_base, 113 struct image_params *iparams); 114static int elf_linux_fixup(register_t **stack_base, 115 struct image_params *iparams); 116static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 117static void exec_linux_setregs(struct thread *td, 118 struct image_params *imgp, u_long stack); 119static register_t *linux_copyout_strings(struct image_params *imgp); 120static boolean_t linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 121static void linux_vdso_install(void *param); 122static void linux_vdso_deinstall(void *param); 123 124static int linux_szplatform; 125const char *linux_kplatform; 126 127static eventhandler_tag linux_exit_tag; 128static eventhandler_tag linux_exec_tag; 129static eventhandler_tag linux_thread_dtor_tag; 130 131/* 132 * Linux syscalls return negative errno's, we do positive and map them 133 * Reference: 134 * FreeBSD: src/sys/sys/errno.h 135 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 136 * linux-2.6.17.8/include/asm-generic/errno.h 137 */ 138static int bsd_to_linux_errno[ELAST + 1] = { 139 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 140 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 141 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 142 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 143 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 144 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 145 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 146 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 147 -6, -6, -43, -42, -75,-125, -84, -61, -16, -74, 148 -72, -67, -71 149}; 150 151#define LINUX_T_UNKNOWN 255 152static int _bsd_to_linux_trapcode[] = { 153 LINUX_T_UNKNOWN, /* 0 */ 154 6, /* 1 T_PRIVINFLT */ 155 LINUX_T_UNKNOWN, /* 2 */ 156 3, /* 3 T_BPTFLT */ 157 LINUX_T_UNKNOWN, /* 4 */ 158 LINUX_T_UNKNOWN, /* 5 */ 159 16, /* 6 T_ARITHTRAP */ 160 254, /* 7 T_ASTFLT */ 161 LINUX_T_UNKNOWN, /* 8 */ 162 13, /* 9 T_PROTFLT */ 163 1, /* 10 T_TRCTRAP */ 164 LINUX_T_UNKNOWN, /* 11 */ 165 14, /* 12 T_PAGEFLT */ 166 LINUX_T_UNKNOWN, /* 13 */ 167 17, /* 14 T_ALIGNFLT */ 168 LINUX_T_UNKNOWN, /* 15 */ 169 LINUX_T_UNKNOWN, /* 16 */ 170 LINUX_T_UNKNOWN, /* 17 */ 171 0, /* 18 T_DIVIDE */ 172 2, /* 19 T_NMI */ 173 4, /* 20 T_OFLOW */ 174 5, /* 21 T_BOUND */ 175 7, /* 22 T_DNA */ 176 8, /* 23 T_DOUBLEFLT */ 177 9, /* 24 T_FPOPFLT */ 178 10, /* 25 T_TSSFLT */ 179 11, /* 26 T_SEGNPFLT */ 180 12, /* 27 T_STKFLT */ 181 18, /* 28 T_MCHK */ 182 19, /* 29 T_XMMFLT */ 183 15 /* 30 T_RESERVED */ 184}; 185#define bsd_to_linux_trapcode(code) \ 186 ((code)<nitems(_bsd_to_linux_trapcode)? \ 187 _bsd_to_linux_trapcode[(code)]: \ 188 LINUX_T_UNKNOWN) 189 190LINUX_VDSO_SYM_INTPTR(linux_sigcode); 191LINUX_VDSO_SYM_INTPTR(linux_rt_sigcode); 192LINUX_VDSO_SYM_INTPTR(linux_vsyscall); 193 194/* 195 * If FreeBSD & Linux have a difference of opinion about what a trap 196 * means, deal with it here. 197 * 198 * MPSAFE 199 */ 200static int 201translate_traps(int signal, int trap_code) 202{ 203 if (signal != SIGBUS) 204 return (signal); 205 switch (trap_code) { 206 case T_PROTFLT: 207 case T_TSSFLT: 208 case T_DOUBLEFLT: 209 case T_PAGEFLT: 210 return (SIGSEGV); 211 default: 212 return (signal); 213 } 214} 215 216static int 217linux_fixup(register_t **stack_base, struct image_params *imgp) 218{ 219 register_t *argv, *envp; 220 221 argv = *stack_base; 222 envp = *stack_base + (imgp->args->argc + 1); 223 (*stack_base)--; 224 suword(*stack_base, (intptr_t)(void *)envp); 225 (*stack_base)--; 226 suword(*stack_base, (intptr_t)(void *)argv); 227 (*stack_base)--; 228 suword(*stack_base, imgp->args->argc); 229 return (0); 230} 231 232static int 233elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 234{ 235 struct proc *p; 236 Elf32_Auxargs *args; 237 Elf32_Addr *uplatform; 238 struct ps_strings *arginfo; 239 register_t *pos; 240 int issetugid; 241 242 KASSERT(curthread->td_proc == imgp->proc, 243 ("unsafe elf_linux_fixup(), should be curproc")); 244 245 p = imgp->proc; 246 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 247 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 248 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); 249 args = (Elf32_Auxargs *)imgp->auxargs; 250 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2); 251 252 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, 253 imgp->proc->p_sysent->sv_shared_page_base); 254 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, linux_vsyscall); 255 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 256 257 /* 258 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 259 * as it has appeared in the 2.4.0-rc7 first time. 260 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 261 * glibc falls back to the hard-coded CLK_TCK value when aux entry 262 * is not present. 263 * Also see linux_times() implementation. 264 */ 265 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 266 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 267 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 268 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 269 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 270 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 271 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 272 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 273 AUXARGS_ENTRY(pos, AT_BASE, args->base); 274 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 275 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 276 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 277 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 278 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 279 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 280 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary); 281 if (imgp->execpathp != 0) 282 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp); 283 if (args->execfd != -1) 284 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 285 AUXARGS_ENTRY(pos, AT_NULL, 0); 286 287 free(imgp->auxargs, M_TEMP); 288 imgp->auxargs = NULL; 289 290 (*stack_base)--; 291 suword(*stack_base, (register_t)imgp->args->argc); 292 return (0); 293} 294 295/* 296 * Copied from kern/kern_exec.c 297 */ 298static register_t * 299linux_copyout_strings(struct image_params *imgp) 300{ 301 int argc, envc; 302 char **vectp; 303 char *stringp, *destp; 304 register_t *stack_base; 305 struct ps_strings *arginfo; 306 char canary[LINUX_AT_RANDOM_LEN]; 307 size_t execpath_len; 308 struct proc *p; 309 310 /* Calculate string base and vector table pointers. */ 311 p = imgp->proc; 312 if (imgp->execpath != NULL && imgp->auxargs != NULL) 313 execpath_len = strlen(imgp->execpath) + 1; 314 else 315 execpath_len = 0; 316 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 317 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - 318 roundup(sizeof(canary), sizeof(char *)) - 319 roundup(execpath_len, sizeof(char *)) - 320 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 321 322 /* Install LINUX_PLATFORM. */ 323 copyout(linux_kplatform, ((caddr_t)arginfo - linux_szplatform), 324 linux_szplatform); 325 326 if (execpath_len != 0) { 327 imgp->execpathp = (uintptr_t)arginfo - 328 linux_szplatform - execpath_len; 329 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 330 } 331 332 /* Prepare the canary for SSP. */ 333 arc4rand(canary, sizeof(canary), 0); 334 imgp->canary = (uintptr_t)arginfo - linux_szplatform - 335 roundup(execpath_len, sizeof(char *)) - 336 roundup(sizeof(canary), sizeof(char *)); 337 copyout(canary, (void *)imgp->canary, sizeof(canary)); 338 339 /* If we have a valid auxargs ptr, prepare some room on the stack. */ 340 if (imgp->auxargs) { 341 /* 342 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 343 * lower compatibility. 344 */ 345 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 346 (LINUX_AT_COUNT * 2); 347 /* 348 * The '+ 2' is for the null pointers at the end of each of 349 * the arg and env vector sets,and imgp->auxarg_size is room 350 * for argument of Runtime loader. 351 */ 352 vectp = (char **)(destp - (imgp->args->argc + 353 imgp->args->envc + 2 + imgp->auxarg_size) * sizeof(char *)); 354 } else { 355 /* 356 * The '+ 2' is for the null pointers at the end of each of 357 * the arg and env vector sets 358 */ 359 vectp = (char **)(destp - (imgp->args->argc + imgp->args->envc + 2) * 360 sizeof(char *)); 361 } 362 363 /* vectp also becomes our initial stack base. */ 364 stack_base = (register_t *)vectp; 365 366 stringp = imgp->args->begin_argv; 367 argc = imgp->args->argc; 368 envc = imgp->args->envc; 369 370 /* Copy out strings - arguments and environment. */ 371 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 372 373 /* Fill in "ps_strings" struct for ps, w, etc. */ 374 suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp); 375 suword(&arginfo->ps_nargvstr, argc); 376 377 /* Fill in argument portion of vector table. */ 378 for (; argc > 0; --argc) { 379 suword(vectp++, (long)(intptr_t)destp); 380 while (*stringp++ != 0) 381 destp++; 382 destp++; 383 } 384 385 /* A null vector table pointer separates the argp's from the envp's. */ 386 suword(vectp++, 0); 387 388 suword(&arginfo->ps_envstr, (long)(intptr_t)vectp); 389 suword(&arginfo->ps_nenvstr, envc); 390 391 /* Fill in environment portion of vector table. */ 392 for (; envc > 0; --envc) { 393 suword(vectp++, (long)(intptr_t)destp); 394 while (*stringp++ != 0) 395 destp++; 396 destp++; 397 } 398 399 /* The end of the vector table is a null pointer. */ 400 suword(vectp, 0); 401 402 return (stack_base); 403} 404 405static void 406linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 407{ 408 struct thread *td = curthread; 409 struct proc *p = td->td_proc; 410 struct sigacts *psp; 411 struct trapframe *regs; 412 struct l_rt_sigframe *fp, frame; 413 int sig, code; 414 int oonstack; 415 416 sig = ksi->ksi_signo; 417 code = ksi->ksi_code; 418 PROC_LOCK_ASSERT(p, MA_OWNED); 419 psp = p->p_sigacts; 420 mtx_assert(&psp->ps_mtx, MA_OWNED); 421 regs = td->td_frame; 422 oonstack = sigonstack(regs->tf_esp); 423 424#ifdef DEBUG 425 if (ldebug(rt_sendsig)) 426 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 427 catcher, sig, (void*)mask, code); 428#endif 429 /* Allocate space for the signal handler context. */ 430 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 431 SIGISMEMBER(psp->ps_sigonstack, sig)) { 432 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 433 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 434 } else 435 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 436 mtx_unlock(&psp->ps_mtx); 437 438 /* Build the argument list for the signal handler. */ 439 sig = bsd_to_linux_signal(sig); 440 441 bzero(&frame, sizeof(frame)); 442 443 frame.sf_handler = catcher; 444 frame.sf_sig = sig; 445 frame.sf_siginfo = &fp->sf_si; 446 frame.sf_ucontext = &fp->sf_sc; 447 448 /* Fill in POSIX parts. */ 449 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 450 451 /* Build the signal context to be used by sigreturn. */ 452 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 453 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 454 455 frame.sf_sc.uc_stack.ss_sp = td->td_sigstk.ss_sp; 456 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 457 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 458 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 459 PROC_UNLOCK(p); 460 461 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 462 463 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 464 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 465 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 466 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 467 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 468 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 469 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 470 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 471 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 472 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 473 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 474 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 475 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 476 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 477 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 478 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 479 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 480 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 481 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 482 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 483 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 484 485#ifdef DEBUG 486 if (ldebug(rt_sendsig)) 487 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 488 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 489 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 490#endif 491 492 if (copyout(&frame, fp, sizeof(frame)) != 0) { 493 /* 494 * Process has trashed its stack; give it an illegal 495 * instruction to halt it in its tracks. 496 */ 497#ifdef DEBUG 498 if (ldebug(rt_sendsig)) 499 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 500 fp, oonstack); 501#endif 502 PROC_LOCK(p); 503 sigexit(td, SIGILL); 504 } 505 506 /* Build context to run handler in. */ 507 regs->tf_esp = (int)fp; 508 regs->tf_eip = linux_rt_sigcode; 509 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 510 regs->tf_cs = _ucodesel; 511 regs->tf_ds = _udatasel; 512 regs->tf_es = _udatasel; 513 regs->tf_fs = _udatasel; 514 regs->tf_ss = _udatasel; 515 PROC_LOCK(p); 516 mtx_lock(&psp->ps_mtx); 517} 518 519 520/* 521 * Send an interrupt to process. 522 * 523 * Stack is set up to allow sigcode stored 524 * in u. to call routine, followed by kcall 525 * to sigreturn routine below. After sigreturn 526 * resets the signal mask, the stack, and the 527 * frame pointer, it returns to the user 528 * specified pc, psl. 529 */ 530static void 531linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 532{ 533 struct thread *td = curthread; 534 struct proc *p = td->td_proc; 535 struct sigacts *psp; 536 struct trapframe *regs; 537 struct l_sigframe *fp, frame; 538 l_sigset_t lmask; 539 int sig, code; 540 int oonstack; 541 542 PROC_LOCK_ASSERT(p, MA_OWNED); 543 psp = p->p_sigacts; 544 sig = ksi->ksi_signo; 545 code = ksi->ksi_code; 546 mtx_assert(&psp->ps_mtx, MA_OWNED); 547 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 548 /* Signal handler installed with SA_SIGINFO. */ 549 linux_rt_sendsig(catcher, ksi, mask); 550 return; 551 } 552 regs = td->td_frame; 553 oonstack = sigonstack(regs->tf_esp); 554 555#ifdef DEBUG 556 if (ldebug(sendsig)) 557 printf(ARGS(sendsig, "%p, %d, %p, %u"), 558 catcher, sig, (void*)mask, code); 559#endif 560 561 /* Allocate space for the signal handler context. */ 562 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 563 SIGISMEMBER(psp->ps_sigonstack, sig)) { 564 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 565 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 566 } else 567 fp = (struct l_sigframe *)regs->tf_esp - 1; 568 mtx_unlock(&psp->ps_mtx); 569 PROC_UNLOCK(p); 570 571 /* Build the argument list for the signal handler. */ 572 sig = bsd_to_linux_signal(sig); 573 574 bzero(&frame, sizeof(frame)); 575 576 frame.sf_handler = catcher; 577 frame.sf_sig = sig; 578 579 bsd_to_linux_sigset(mask, &lmask); 580 581 /* Build the signal context to be used by sigreturn. */ 582 frame.sf_sc.sc_mask = lmask.__mask; 583 frame.sf_sc.sc_gs = rgs(); 584 frame.sf_sc.sc_fs = regs->tf_fs; 585 frame.sf_sc.sc_es = regs->tf_es; 586 frame.sf_sc.sc_ds = regs->tf_ds; 587 frame.sf_sc.sc_edi = regs->tf_edi; 588 frame.sf_sc.sc_esi = regs->tf_esi; 589 frame.sf_sc.sc_ebp = regs->tf_ebp; 590 frame.sf_sc.sc_ebx = regs->tf_ebx; 591 frame.sf_sc.sc_esp = regs->tf_esp; 592 frame.sf_sc.sc_edx = regs->tf_edx; 593 frame.sf_sc.sc_ecx = regs->tf_ecx; 594 frame.sf_sc.sc_eax = regs->tf_eax; 595 frame.sf_sc.sc_eip = regs->tf_eip; 596 frame.sf_sc.sc_cs = regs->tf_cs; 597 frame.sf_sc.sc_eflags = regs->tf_eflags; 598 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 599 frame.sf_sc.sc_ss = regs->tf_ss; 600 frame.sf_sc.sc_err = regs->tf_err; 601 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 602 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 603 604 frame.sf_extramask[0] = lmask.__mask; 605 606 if (copyout(&frame, fp, sizeof(frame)) != 0) { 607 /* 608 * Process has trashed its stack; give it an illegal 609 * instruction to halt it in its tracks. 610 */ 611 PROC_LOCK(p); 612 sigexit(td, SIGILL); 613 } 614 615 /* Build context to run handler in. */ 616 regs->tf_esp = (int)fp; 617 regs->tf_eip = linux_sigcode; 618 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 619 regs->tf_cs = _ucodesel; 620 regs->tf_ds = _udatasel; 621 regs->tf_es = _udatasel; 622 regs->tf_fs = _udatasel; 623 regs->tf_ss = _udatasel; 624 PROC_LOCK(p); 625 mtx_lock(&psp->ps_mtx); 626} 627 628/* 629 * System call to cleanup state after a signal 630 * has been taken. Reset signal mask and 631 * stack state from context left by sendsig (above). 632 * Return to previous pc and psl as specified by 633 * context left by sendsig. Check carefully to 634 * make sure that the user has not modified the 635 * psl to gain improper privileges or to cause 636 * a machine fault. 637 */ 638int 639linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 640{ 641 struct l_sigframe frame; 642 struct trapframe *regs; 643 l_sigset_t lmask; 644 sigset_t bmask; 645 int eflags; 646 ksiginfo_t ksi; 647 648 regs = td->td_frame; 649 650#ifdef DEBUG 651 if (ldebug(sigreturn)) 652 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 653#endif 654 /* 655 * The trampoline code hands us the sigframe. 656 * It is unsafe to keep track of it ourselves, in the event that a 657 * program jumps out of a signal handler. 658 */ 659 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 660 return (EFAULT); 661 662 /* Check for security violations. */ 663#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 664 eflags = frame.sf_sc.sc_eflags; 665 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 666 return (EINVAL); 667 668 /* 669 * Don't allow users to load a valid privileged %cs. Let the 670 * hardware check for invalid selectors, excess privilege in 671 * other selectors, invalid %eip's and invalid %esp's. 672 */ 673#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 674 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 675 ksiginfo_init_trap(&ksi); 676 ksi.ksi_signo = SIGBUS; 677 ksi.ksi_code = BUS_OBJERR; 678 ksi.ksi_trapno = T_PROTFLT; 679 ksi.ksi_addr = (void *)regs->tf_eip; 680 trapsignal(td, &ksi); 681 return (EINVAL); 682 } 683 684 lmask.__mask = frame.sf_sc.sc_mask; 685 linux_to_bsd_sigset(&lmask, &bmask); 686 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 687 688 /* Restore signal context. */ 689 /* %gs was restored by the trampoline. */ 690 regs->tf_fs = frame.sf_sc.sc_fs; 691 regs->tf_es = frame.sf_sc.sc_es; 692 regs->tf_ds = frame.sf_sc.sc_ds; 693 regs->tf_edi = frame.sf_sc.sc_edi; 694 regs->tf_esi = frame.sf_sc.sc_esi; 695 regs->tf_ebp = frame.sf_sc.sc_ebp; 696 regs->tf_ebx = frame.sf_sc.sc_ebx; 697 regs->tf_edx = frame.sf_sc.sc_edx; 698 regs->tf_ecx = frame.sf_sc.sc_ecx; 699 regs->tf_eax = frame.sf_sc.sc_eax; 700 regs->tf_eip = frame.sf_sc.sc_eip; 701 regs->tf_cs = frame.sf_sc.sc_cs; 702 regs->tf_eflags = eflags; 703 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 704 regs->tf_ss = frame.sf_sc.sc_ss; 705 706 return (EJUSTRETURN); 707} 708 709/* 710 * System call to cleanup state after a signal 711 * has been taken. Reset signal mask and 712 * stack state from context left by rt_sendsig (above). 713 * Return to previous pc and psl as specified by 714 * context left by sendsig. Check carefully to 715 * make sure that the user has not modified the 716 * psl to gain improper privileges or to cause 717 * a machine fault. 718 */ 719int 720linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 721{ 722 struct l_ucontext uc; 723 struct l_sigcontext *context; 724 sigset_t bmask; 725 l_stack_t *lss; 726 stack_t ss; 727 struct trapframe *regs; 728 int eflags; 729 ksiginfo_t ksi; 730 731 regs = td->td_frame; 732 733#ifdef DEBUG 734 if (ldebug(rt_sigreturn)) 735 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 736#endif 737 /* 738 * The trampoline code hands us the ucontext. 739 * It is unsafe to keep track of it ourselves, in the event that a 740 * program jumps out of a signal handler. 741 */ 742 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 743 return (EFAULT); 744 745 context = &uc.uc_mcontext; 746 747 /* Check for security violations. */ 748#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 749 eflags = context->sc_eflags; 750 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 751 return (EINVAL); 752 753 /* 754 * Don't allow users to load a valid privileged %cs. Let the 755 * hardware check for invalid selectors, excess privilege in 756 * other selectors, invalid %eip's and invalid %esp's. 757 */ 758#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 759 if (!CS_SECURE(context->sc_cs)) { 760 ksiginfo_init_trap(&ksi); 761 ksi.ksi_signo = SIGBUS; 762 ksi.ksi_code = BUS_OBJERR; 763 ksi.ksi_trapno = T_PROTFLT; 764 ksi.ksi_addr = (void *)regs->tf_eip; 765 trapsignal(td, &ksi); 766 return (EINVAL); 767 } 768 769 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 770 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 771 772 /* Restore signal context. */ 773 /* %gs was restored by the trampoline. */ 774 regs->tf_fs = context->sc_fs; 775 regs->tf_es = context->sc_es; 776 regs->tf_ds = context->sc_ds; 777 regs->tf_edi = context->sc_edi; 778 regs->tf_esi = context->sc_esi; 779 regs->tf_ebp = context->sc_ebp; 780 regs->tf_ebx = context->sc_ebx; 781 regs->tf_edx = context->sc_edx; 782 regs->tf_ecx = context->sc_ecx; 783 regs->tf_eax = context->sc_eax; 784 regs->tf_eip = context->sc_eip; 785 regs->tf_cs = context->sc_cs; 786 regs->tf_eflags = eflags; 787 regs->tf_esp = context->sc_esp_at_signal; 788 regs->tf_ss = context->sc_ss; 789 790 /* Call sigaltstack & ignore results. */ 791 lss = &uc.uc_stack; 792 ss.ss_sp = lss->ss_sp; 793 ss.ss_size = lss->ss_size; 794 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 795 796#ifdef DEBUG 797 if (ldebug(rt_sigreturn)) 798 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"), 799 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 800#endif 801 (void)kern_sigaltstack(td, &ss, NULL); 802 803 return (EJUSTRETURN); 804} 805 806static int 807linux_fetch_syscall_args(struct thread *td) 808{ 809 struct proc *p; 810 struct trapframe *frame; 811 struct syscall_args *sa; 812 813 p = td->td_proc; 814 frame = td->td_frame; 815 sa = &td->td_sa; 816 817 sa->code = frame->tf_eax; 818 sa->args[0] = frame->tf_ebx; 819 sa->args[1] = frame->tf_ecx; 820 sa->args[2] = frame->tf_edx; 821 sa->args[3] = frame->tf_esi; 822 sa->args[4] = frame->tf_edi; 823 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 824 825 if (sa->code >= p->p_sysent->sv_size) 826 /* nosys */ 827 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 828 else 829 sa->callp = &p->p_sysent->sv_table[sa->code]; 830 sa->narg = sa->callp->sy_narg; 831 832 td->td_retval[0] = 0; 833 td->td_retval[1] = frame->tf_edx; 834 835 return (0); 836} 837 838/* 839 * If a linux binary is exec'ing something, try this image activator 840 * first. We override standard shell script execution in order to 841 * be able to modify the interpreter path. We only do this if a linux 842 * binary is doing the exec, so we do not create an EXEC module for it. 843 */ 844static int exec_linux_imgact_try(struct image_params *iparams); 845 846static int 847exec_linux_imgact_try(struct image_params *imgp) 848{ 849 const char *head = (const char *)imgp->image_header; 850 char *rpath; 851 int error = -1; 852 853 /* 854 * The interpreter for shell scripts run from a linux binary needs 855 * to be located in /compat/linux if possible in order to recursively 856 * maintain linux path emulation. 857 */ 858 if (((const short *)head)[0] == SHELLMAGIC) { 859 /* 860 * Run our normal shell image activator. If it succeeds attempt 861 * to use the alternate path for the interpreter. If an alternate 862 * path is found, use our stringspace to store it. 863 */ 864 if ((error = exec_shell_imgact(imgp)) == 0) { 865 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 866 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, AT_FDCWD); 867 if (rpath != NULL) 868 imgp->args->fname_buf = 869 imgp->interpreter_name = rpath; 870 } 871 } 872 return (error); 873} 874 875/* 876 * exec_setregs may initialize some registers differently than Linux 877 * does, thus potentially confusing Linux binaries. If necessary, we 878 * override the exec_setregs default(s) here. 879 */ 880static void 881exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 882{ 883 struct pcb *pcb = td->td_pcb; 884 885 exec_setregs(td, imgp, stack); 886 887 /* Linux sets %gs to 0, we default to _udatasel. */ 888 pcb->pcb_gs = 0; 889 load_gs(0); 890 891 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 892} 893 894static void 895linux_get_machine(const char **dst) 896{ 897 898 switch (cpu_class) { 899 case CPUCLASS_686: 900 *dst = "i686"; 901 break; 902 case CPUCLASS_586: 903 *dst = "i586"; 904 break; 905 case CPUCLASS_486: 906 *dst = "i486"; 907 break; 908 default: 909 *dst = "i386"; 910 } 911} 912 913struct sysentvec linux_sysvec = { 914 .sv_size = LINUX_SYS_MAXSYSCALL, 915 .sv_table = linux_sysent, 916 .sv_mask = 0, 917 .sv_errsize = ELAST + 1, 918 .sv_errtbl = bsd_to_linux_errno, 919 .sv_transtrap = translate_traps, 920 .sv_fixup = linux_fixup, 921 .sv_sendsig = linux_sendsig, 922 .sv_sigcode = &_binary_linux_locore_o_start, 923 .sv_szsigcode = &linux_szsigcode, 924 .sv_name = "Linux a.out", 925 .sv_coredump = NULL, 926 .sv_imgact_try = exec_linux_imgact_try, 927 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 928 .sv_pagesize = PAGE_SIZE, 929 .sv_minuser = VM_MIN_ADDRESS, 930 .sv_maxuser = VM_MAXUSER_ADDRESS, 931 .sv_usrstack = LINUX_USRSTACK, 932 .sv_psstrings = PS_STRINGS, 933 .sv_stackprot = VM_PROT_ALL, 934 .sv_copyout_strings = exec_copyout_strings, 935 .sv_setregs = exec_linux_setregs, 936 .sv_fixlimit = NULL, 937 .sv_maxssiz = NULL, 938 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32, 939 .sv_set_syscall_retval = cpu_set_syscall_retval, 940 .sv_fetch_syscall_args = linux_fetch_syscall_args, 941 .sv_syscallnames = NULL, 942 .sv_shared_page_base = LINUX_SHAREDPAGE, 943 .sv_shared_page_len = PAGE_SIZE, 944 .sv_schedtail = linux_schedtail, 945 .sv_thread_detach = linux_thread_detach, 946 .sv_trap = NULL, 947}; 948INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 949 950struct sysentvec elf_linux_sysvec = { 951 .sv_size = LINUX_SYS_MAXSYSCALL, 952 .sv_table = linux_sysent, 953 .sv_mask = 0, 954 .sv_errsize = ELAST + 1, 955 .sv_errtbl = bsd_to_linux_errno, 956 .sv_transtrap = translate_traps, 957 .sv_fixup = elf_linux_fixup, 958 .sv_sendsig = linux_sendsig, 959 .sv_sigcode = &_binary_linux_locore_o_start, 960 .sv_szsigcode = &linux_szsigcode, 961 .sv_name = "Linux ELF", 962 .sv_coredump = elf32_coredump, 963 .sv_imgact_try = exec_linux_imgact_try, 964 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 965 .sv_pagesize = PAGE_SIZE, 966 .sv_minuser = VM_MIN_ADDRESS, 967 .sv_maxuser = VM_MAXUSER_ADDRESS, 968 .sv_usrstack = LINUX_USRSTACK, 969 .sv_psstrings = LINUX_PS_STRINGS, 970 .sv_stackprot = VM_PROT_ALL, 971 .sv_copyout_strings = linux_copyout_strings, 972 .sv_setregs = exec_linux_setregs, 973 .sv_fixlimit = NULL, 974 .sv_maxssiz = NULL, 975 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP, 976 .sv_set_syscall_retval = cpu_set_syscall_retval, 977 .sv_fetch_syscall_args = linux_fetch_syscall_args, 978 .sv_syscallnames = NULL, 979 .sv_shared_page_base = LINUX_SHAREDPAGE, 980 .sv_shared_page_len = PAGE_SIZE, 981 .sv_schedtail = linux_schedtail, 982 .sv_thread_detach = linux_thread_detach, 983 .sv_trap = NULL, 984}; 985 986static void 987linux_vdso_install(void *param) 988{ 989 990 linux_szsigcode = (&_binary_linux_locore_o_end - 991 &_binary_linux_locore_o_start); 992 993 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 994 panic("Linux invalid vdso size\n"); 995 996 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 997 998 linux_shared_page_obj = __elfN(linux_shared_page_init) 999 (&linux_shared_page_mapping); 1000 1001 __elfN(linux_vdso_reloc)(&elf_linux_sysvec, LINUX_SHAREDPAGE); 1002 1003 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1004 linux_szsigcode); 1005 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1006} 1007SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1008 (sysinit_cfunc_t)linux_vdso_install, NULL); 1009 1010static void 1011linux_vdso_deinstall(void *param) 1012{ 1013 1014 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1015}; 1016SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1017 (sysinit_cfunc_t)linux_vdso_deinstall, NULL); 1018 1019static char GNU_ABI_VENDOR[] = "GNU"; 1020static int GNULINUX_ABI_DESC = 0; 1021 1022static boolean_t 1023linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1024{ 1025 const Elf32_Word *desc; 1026 uintptr_t p; 1027 1028 p = (uintptr_t)(note + 1); 1029 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1030 1031 desc = (const Elf32_Word *)p; 1032 if (desc[0] != GNULINUX_ABI_DESC) 1033 return (FALSE); 1034 1035 /* 1036 * For linux we encode osrel as follows (see linux_mib.c): 1037 * VVVMMMIII (version, major, minor), see linux_mib.c. 1038 */ 1039 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1040 1041 return (TRUE); 1042} 1043 1044static Elf_Brandnote linux_brandnote = { 1045 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1046 .hdr.n_descsz = 16, /* XXX at least 16 */ 1047 .hdr.n_type = 1, 1048 .vendor = GNU_ABI_VENDOR, 1049 .flags = BN_TRANSLATE_OSREL, 1050 .trans_osrel = linux_trans_osrel 1051}; 1052 1053static Elf32_Brandinfo linux_brand = { 1054 .brand = ELFOSABI_LINUX, 1055 .machine = EM_386, 1056 .compat_3_brand = "Linux", 1057 .emul_path = "/compat/linux", 1058 .interp_path = "/lib/ld-linux.so.1", 1059 .sysvec = &elf_linux_sysvec, 1060 .interp_newpath = NULL, 1061 .brand_note = &linux_brandnote, 1062 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1063}; 1064 1065static Elf32_Brandinfo linux_glibc2brand = { 1066 .brand = ELFOSABI_LINUX, 1067 .machine = EM_386, 1068 .compat_3_brand = "Linux", 1069 .emul_path = "/compat/linux", 1070 .interp_path = "/lib/ld-linux.so.2", 1071 .sysvec = &elf_linux_sysvec, 1072 .interp_newpath = NULL, 1073 .brand_note = &linux_brandnote, 1074 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1075}; 1076 1077static Elf32_Brandinfo linux_muslbrand = { 1078 .brand = ELFOSABI_LINUX, 1079 .machine = EM_386, 1080 .compat_3_brand = "Linux", 1081 .emul_path = "/compat/linux", 1082 .interp_path = "/lib/ld-musl-i386.so.1", 1083 .sysvec = &elf_linux_sysvec, 1084 .interp_newpath = NULL, 1085 .brand_note = &linux_brandnote, 1086 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1087}; 1088 1089Elf32_Brandinfo *linux_brandlist[] = { 1090 &linux_brand, 1091 &linux_glibc2brand, 1092 &linux_muslbrand, 1093 NULL 1094}; 1095 1096static int 1097linux_elf_modevent(module_t mod, int type, void *data) 1098{ 1099 Elf32_Brandinfo **brandinfo; 1100 int error; 1101 struct linux_ioctl_handler **lihp; 1102 1103 error = 0; 1104 1105 switch(type) { 1106 case MOD_LOAD: 1107 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1108 ++brandinfo) 1109 if (elf32_insert_brand_entry(*brandinfo) < 0) 1110 error = EINVAL; 1111 if (error == 0) { 1112 SET_FOREACH(lihp, linux_ioctl_handler_set) 1113 linux_ioctl_register_handler(*lihp); 1114 LIST_INIT(&futex_list); 1115 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1116 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, linux_proc_exit, 1117 NULL, 1000); 1118 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, linux_proc_exec, 1119 NULL, 1000); 1120 linux_thread_dtor_tag = EVENTHANDLER_REGISTER(thread_dtor, 1121 linux_thread_dtor, NULL, EVENTHANDLER_PRI_ANY); 1122 linux_get_machine(&linux_kplatform); 1123 linux_szplatform = roundup(strlen(linux_kplatform) + 1, 1124 sizeof(char *)); 1125 linux_osd_jail_register(); 1126 stclohz = (stathz ? stathz : hz); 1127 if (bootverbose) 1128 printf("Linux ELF exec handler installed\n"); 1129 } else 1130 printf("cannot insert Linux ELF brand handler\n"); 1131 break; 1132 case MOD_UNLOAD: 1133 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1134 ++brandinfo) 1135 if (elf32_brand_inuse(*brandinfo)) 1136 error = EBUSY; 1137 if (error == 0) { 1138 for (brandinfo = &linux_brandlist[0]; 1139 *brandinfo != NULL; ++brandinfo) 1140 if (elf32_remove_brand_entry(*brandinfo) < 0) 1141 error = EINVAL; 1142 } 1143 if (error == 0) { 1144 SET_FOREACH(lihp, linux_ioctl_handler_set) 1145 linux_ioctl_unregister_handler(*lihp); 1146 mtx_destroy(&futex_mtx); 1147 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1148 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1149 EVENTHANDLER_DEREGISTER(thread_dtor, linux_thread_dtor_tag); 1150 linux_osd_jail_deregister(); 1151 if (bootverbose) 1152 printf("Linux ELF exec handler removed\n"); 1153 } else 1154 printf("Could not deinstall ELF interpreter entry\n"); 1155 break; 1156 default: 1157 return (EOPNOTSUPP); 1158 } 1159 return (error); 1160} 1161 1162static moduledata_t linux_elf_mod = { 1163 "linuxelf", 1164 linux_elf_modevent, 1165 0 1166}; 1167 1168DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1169FEATURE(linux, "Linux 32bit support"); 1170