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/malloc.h> 41 #include <sys/module.h> 42 #include <sys/proc.h> 43 #include <sys/stddef.h> 44 #include <sys/signalvar.h> 45 #include <sys/syscallsubr.h> 46 #include <sys/sysctl.h> 47 #include <sys/sysent.h> 48 #include <sys/sysproto.h> 49 #include <sys/vnode.h> 50 51 #include <vm/vm.h> 52 #include <vm/pmap.h> 53 #include <vm/vm_extern.h> 54 #include <vm/vm_map.h> 55 #include <vm/vm_object.h> 56 #include <vm/vm_page.h> 57 #include <vm/vm_param.h> 58 59 #include <machine/cpu.h> 60 #include <machine/cputypes.h> 61 #include <machine/md_var.h> 62 #include <machine/pcb.h> 63 #include <machine/trap.h> 64 65 #include <x86/linux/linux_x86.h> 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_ioctl.h> 70 #include <compat/linux/linux_mib.h> 71 #include <compat/linux/linux_misc.h> 72 #include <compat/linux/linux_signal.h> 73 #include <compat/linux/linux_util.h> 74 #include <compat/linux/linux_vdso.h> 75 76 MODULE_VERSION(linux, 1); 77 78 #define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2 79 #define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - LINUX_VDSOPAGE_SIZE) 80 #define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE) 81 /* 82 * PAGE_SIZE - the size 83 * of the native SHAREDPAGE 84 */ 85 #define LINUX_USRSTACK LINUX_SHAREDPAGE 86 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 87 88 static int linux_szsigcode; 89 static vm_object_t linux_vdso_obj; 90 static char *linux_vdso_mapping; 91 extern char _binary_linux_vdso_so_o_start; 92 extern char _binary_linux_vdso_so_o_end; 93 static vm_offset_t linux_vdso_base; 94 95 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 96 97 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 98 99 static int linux_fixup(uintptr_t *stack_base, 100 struct image_params *iparams); 101 static int linux_fixup_elf(uintptr_t *stack_base, 102 struct image_params *iparams); 103 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 104 static void linux_exec_setregs(struct thread *td, 105 struct image_params *imgp, uintptr_t stack); 106 static void linux_exec_sysvec_init(void *param); 107 static int linux_on_exec_vmspace(struct proc *p, 108 struct image_params *imgp); 109 static int linux_copyout_strings(struct image_params *imgp, 110 uintptr_t *stack_base); 111 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 112 static void linux_vdso_install(const void *param); 113 static void linux_vdso_deinstall(const void *param); 114 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 115 116 #define LINUX_T_UNKNOWN 255 117 static int _bsd_to_linux_trapcode[] = { 118 LINUX_T_UNKNOWN, /* 0 */ 119 6, /* 1 T_PRIVINFLT */ 120 LINUX_T_UNKNOWN, /* 2 */ 121 3, /* 3 T_BPTFLT */ 122 LINUX_T_UNKNOWN, /* 4 */ 123 LINUX_T_UNKNOWN, /* 5 */ 124 16, /* 6 T_ARITHTRAP */ 125 254, /* 7 T_ASTFLT */ 126 LINUX_T_UNKNOWN, /* 8 */ 127 13, /* 9 T_PROTFLT */ 128 1, /* 10 T_TRCTRAP */ 129 LINUX_T_UNKNOWN, /* 11 */ 130 14, /* 12 T_PAGEFLT */ 131 LINUX_T_UNKNOWN, /* 13 */ 132 17, /* 14 T_ALIGNFLT */ 133 LINUX_T_UNKNOWN, /* 15 */ 134 LINUX_T_UNKNOWN, /* 16 */ 135 LINUX_T_UNKNOWN, /* 17 */ 136 0, /* 18 T_DIVIDE */ 137 2, /* 19 T_NMI */ 138 4, /* 20 T_OFLOW */ 139 5, /* 21 T_BOUND */ 140 7, /* 22 T_DNA */ 141 8, /* 23 T_DOUBLEFLT */ 142 9, /* 24 T_FPOPFLT */ 143 10, /* 25 T_TSSFLT */ 144 11, /* 26 T_SEGNPFLT */ 145 12, /* 27 T_STKFLT */ 146 18, /* 28 T_MCHK */ 147 19, /* 29 T_XMMFLT */ 148 15 /* 30 T_RESERVED */ 149 }; 150 #define bsd_to_linux_trapcode(code) \ 151 ((code)<nitems(_bsd_to_linux_trapcode)? \ 152 _bsd_to_linux_trapcode[(code)]: \ 153 LINUX_T_UNKNOWN) 154 155 LINUX_VDSO_SYM_CHAR(linux_platform); 156 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 157 LINUX_VDSO_SYM_INTPTR(__kernel_sigreturn); 158 LINUX_VDSO_SYM_INTPTR(__kernel_rt_sigreturn); 159 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 160 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 161 162 /* 163 * If FreeBSD & Linux have a difference of opinion about what a trap 164 * means, deal with it here. 165 * 166 * MPSAFE 167 */ 168 static int 169 linux_translate_traps(int signal, int trap_code) 170 { 171 if (signal != SIGBUS) 172 return (signal); 173 switch (trap_code) { 174 case T_PROTFLT: 175 case T_TSSFLT: 176 case T_DOUBLEFLT: 177 case T_PAGEFLT: 178 return (SIGSEGV); 179 default: 180 return (signal); 181 } 182 } 183 184 static int 185 linux_fixup(uintptr_t *stack_base, struct image_params *imgp) 186 { 187 register_t *base, *argv, *envp; 188 189 base = (register_t *)*stack_base; 190 argv = base; 191 envp = base + (imgp->args->argc + 1); 192 base--; 193 suword(base, (intptr_t)envp); 194 base--; 195 suword(base, (intptr_t)argv); 196 base--; 197 suword(base, imgp->args->argc); 198 *stack_base = (uintptr_t)base; 199 return (0); 200 } 201 202 static int 203 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 204 { 205 struct proc *p; 206 Elf32_Auxargs *args; 207 Elf32_Auxinfo *argarray, *pos; 208 struct ps_strings *arginfo; 209 int error, issetugid; 210 211 p = imgp->proc; 212 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 213 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 214 args = (Elf32_Auxargs *)imgp->auxargs; 215 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 216 M_WAITOK | M_ZERO); 217 218 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 219 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 220 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 221 222 /* 223 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 224 * as it has appeared in the 2.4.0-rc7 first time. 225 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 226 * glibc falls back to the hard-coded CLK_TCK value when aux entry 227 * is not present. 228 * Also see linux_times() implementation. 229 */ 230 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 231 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 232 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 233 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 234 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 235 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 236 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 237 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 238 AUXARGS_ENTRY(pos, AT_BASE, args->base); 239 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 240 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 241 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 242 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 243 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 244 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 245 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); 246 if (imgp->execpathp != 0) 247 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); 248 if (args->execfd != -1) 249 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 250 AUXARGS_ENTRY(pos, AT_NULL, 0); 251 252 free(imgp->auxargs, M_TEMP); 253 imgp->auxargs = NULL; 254 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 255 256 error = copyout(argarray, (void *)base, 257 sizeof(*argarray) * LINUX_AT_COUNT); 258 free(argarray, M_TEMP); 259 return (error); 260 } 261 262 static int 263 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 264 { 265 register_t *base; 266 267 base = (register_t *)*stack_base; 268 base--; 269 if (suword(base, (register_t)imgp->args->argc) == -1) 270 return (EFAULT); 271 *stack_base = (uintptr_t)base; 272 return (0); 273 } 274 275 /* 276 * Copied from kern/kern_exec.c 277 */ 278 static int 279 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 280 { 281 int argc, envc, error; 282 char **vectp; 283 char *stringp; 284 uintptr_t destp, ustringp; 285 struct ps_strings *arginfo; 286 char canary[LINUX_AT_RANDOM_LEN]; 287 size_t execpath_len; 288 struct proc *p; 289 290 /* Calculate string base and vector table pointers. */ 291 p = imgp->proc; 292 if (imgp->execpath != NULL && imgp->auxargs != NULL) 293 execpath_len = strlen(imgp->execpath) + 1; 294 else 295 execpath_len = 0; 296 arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings; 297 destp = (uintptr_t)arginfo; 298 299 if (execpath_len != 0) { 300 destp -= execpath_len; 301 destp = rounddown2(destp, sizeof(void *)); 302 imgp->execpathp = (void *)destp; 303 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 304 if (error != 0) 305 return (error); 306 } 307 308 /* Prepare the canary for SSP. */ 309 arc4rand(canary, sizeof(canary), 0); 310 destp -= roundup(sizeof(canary), sizeof(void *)); 311 imgp->canary = (void *)destp; 312 error = copyout(canary, imgp->canary, sizeof(canary)); 313 if (error != 0) 314 return (error); 315 316 /* Allocate room for the argument and environment strings. */ 317 destp -= ARG_MAX - imgp->args->stringspace; 318 destp = rounddown2(destp, sizeof(void *)); 319 ustringp = destp; 320 321 if (imgp->auxargs) { 322 /* 323 * Allocate room on the stack for the ELF auxargs 324 * array. It has LINUX_AT_COUNT entries. 325 */ 326 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 327 destp = rounddown2(destp, sizeof(void *)); 328 } 329 330 vectp = (char **)destp; 331 332 /* 333 * Allocate room for the argv[] and env vectors including the 334 * terminating NULL pointers. 335 */ 336 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 337 338 /* vectp also becomes our initial stack base. */ 339 *stack_base = (uintptr_t)vectp; 340 341 stringp = imgp->args->begin_argv; 342 argc = imgp->args->argc; 343 envc = imgp->args->envc; 344 345 /* Copy out strings - arguments and environment. */ 346 error = copyout(stringp, (void *)ustringp, 347 ARG_MAX - imgp->args->stringspace); 348 if (error != 0) 349 return (error); 350 351 /* Fill in "ps_strings" struct for ps, w, etc. */ 352 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || 353 suword(&arginfo->ps_nargvstr, argc) != 0) 354 return (EFAULT); 355 356 /* Fill in argument portion of vector table. */ 357 for (; argc > 0; --argc) { 358 if (suword(vectp++, ustringp) != 0) 359 return (EFAULT); 360 while (*stringp++ != 0) 361 ustringp++; 362 ustringp++; 363 } 364 365 /* A null vector table pointer separates the argp's from the envp's. */ 366 if (suword(vectp++, 0) != 0) 367 return (EFAULT); 368 369 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || 370 suword(&arginfo->ps_nenvstr, envc) != 0) 371 return (EFAULT); 372 373 /* Fill in environment portion of vector table. */ 374 for (; envc > 0; --envc) { 375 if (suword(vectp++, ustringp) != 0) 376 return (EFAULT); 377 while (*stringp++ != 0) 378 ustringp++; 379 ustringp++; 380 } 381 382 /* The end of the vector table is a null pointer. */ 383 if (suword(vectp, 0) != 0) 384 return (EFAULT); 385 386 if (imgp->auxargs) { 387 vectp++; 388 error = imgp->sysent->sv_copyout_auxargs(imgp, 389 (uintptr_t)vectp); 390 if (error != 0) 391 return (error); 392 } 393 394 return (0); 395 } 396 397 static void 398 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 399 { 400 struct thread *td = curthread; 401 struct proc *p = td->td_proc; 402 struct sigacts *psp; 403 struct trapframe *regs; 404 struct l_rt_sigframe *fp, frame; 405 int sig, code; 406 int oonstack; 407 408 sig = ksi->ksi_signo; 409 code = ksi->ksi_code; 410 PROC_LOCK_ASSERT(p, MA_OWNED); 411 psp = p->p_sigacts; 412 mtx_assert(&psp->ps_mtx, MA_OWNED); 413 regs = td->td_frame; 414 oonstack = sigonstack(regs->tf_esp); 415 416 /* Allocate space for the signal handler context. */ 417 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 418 SIGISMEMBER(psp->ps_sigonstack, sig)) { 419 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 420 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 421 } else 422 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 423 mtx_unlock(&psp->ps_mtx); 424 425 /* Build the argument list for the signal handler. */ 426 sig = bsd_to_linux_signal(sig); 427 428 bzero(&frame, sizeof(frame)); 429 430 frame.sf_handler = catcher; 431 frame.sf_sig = sig; 432 frame.sf_siginfo = &fp->sf_si; 433 frame.sf_ucontext = &fp->sf_sc; 434 435 /* Fill in POSIX parts. */ 436 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 437 438 /* Build the signal context to be used by sigreturn. */ 439 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 440 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 441 442 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 443 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 444 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 445 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 446 PROC_UNLOCK(p); 447 448 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 449 450 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 451 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 452 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 453 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 454 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 455 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 456 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 457 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 458 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 459 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 460 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 461 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 462 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 463 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 464 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 465 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 466 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 467 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 468 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 469 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 470 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 471 472 if (copyout(&frame, fp, sizeof(frame)) != 0) { 473 /* 474 * Process has trashed its stack; give it an illegal 475 * instruction to halt it in its tracks. 476 */ 477 PROC_LOCK(p); 478 sigexit(td, SIGILL); 479 } 480 481 /* Build context to run handler in. */ 482 regs->tf_esp = (int)fp; 483 regs->tf_eip = __kernel_rt_sigreturn; 484 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 485 regs->tf_cs = _ucodesel; 486 regs->tf_ds = _udatasel; 487 regs->tf_es = _udatasel; 488 regs->tf_fs = _udatasel; 489 regs->tf_ss = _udatasel; 490 PROC_LOCK(p); 491 mtx_lock(&psp->ps_mtx); 492 } 493 494 /* 495 * Send an interrupt to process. 496 * 497 * Stack is set up to allow sigcode stored 498 * in u. to call routine, followed by kcall 499 * to sigreturn routine below. After sigreturn 500 * resets the signal mask, the stack, and the 501 * frame pointer, it returns to the user 502 * specified pc, psl. 503 */ 504 static void 505 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 506 { 507 struct thread *td = curthread; 508 struct proc *p = td->td_proc; 509 struct sigacts *psp; 510 struct trapframe *regs; 511 struct l_sigframe *fp, frame; 512 l_sigset_t lmask; 513 int sig, code; 514 int oonstack; 515 516 PROC_LOCK_ASSERT(p, MA_OWNED); 517 psp = p->p_sigacts; 518 sig = ksi->ksi_signo; 519 code = ksi->ksi_code; 520 mtx_assert(&psp->ps_mtx, MA_OWNED); 521 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 522 /* Signal handler installed with SA_SIGINFO. */ 523 linux_rt_sendsig(catcher, ksi, mask); 524 return; 525 } 526 regs = td->td_frame; 527 oonstack = sigonstack(regs->tf_esp); 528 529 /* Allocate space for the signal handler context. */ 530 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 531 SIGISMEMBER(psp->ps_sigonstack, sig)) { 532 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 533 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 534 } else 535 fp = (struct l_sigframe *)regs->tf_esp - 1; 536 mtx_unlock(&psp->ps_mtx); 537 PROC_UNLOCK(p); 538 539 /* Build the argument list for the signal handler. */ 540 sig = bsd_to_linux_signal(sig); 541 542 bzero(&frame, sizeof(frame)); 543 544 frame.sf_handler = catcher; 545 frame.sf_sig = sig; 546 547 bsd_to_linux_sigset(mask, &lmask); 548 549 /* Build the signal context to be used by sigreturn. */ 550 frame.sf_sc.sc_mask = lmask.__mask; 551 frame.sf_sc.sc_gs = rgs(); 552 frame.sf_sc.sc_fs = regs->tf_fs; 553 frame.sf_sc.sc_es = regs->tf_es; 554 frame.sf_sc.sc_ds = regs->tf_ds; 555 frame.sf_sc.sc_edi = regs->tf_edi; 556 frame.sf_sc.sc_esi = regs->tf_esi; 557 frame.sf_sc.sc_ebp = regs->tf_ebp; 558 frame.sf_sc.sc_ebx = regs->tf_ebx; 559 frame.sf_sc.sc_esp = regs->tf_esp; 560 frame.sf_sc.sc_edx = regs->tf_edx; 561 frame.sf_sc.sc_ecx = regs->tf_ecx; 562 frame.sf_sc.sc_eax = regs->tf_eax; 563 frame.sf_sc.sc_eip = regs->tf_eip; 564 frame.sf_sc.sc_cs = regs->tf_cs; 565 frame.sf_sc.sc_eflags = regs->tf_eflags; 566 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 567 frame.sf_sc.sc_ss = regs->tf_ss; 568 frame.sf_sc.sc_err = regs->tf_err; 569 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 570 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 571 572 frame.sf_extramask[0] = lmask.__mask; 573 574 if (copyout(&frame, fp, sizeof(frame)) != 0) { 575 /* 576 * Process has trashed its stack; give it an illegal 577 * instruction to halt it in its tracks. 578 */ 579 PROC_LOCK(p); 580 sigexit(td, SIGILL); 581 } 582 583 /* Build context to run handler in. */ 584 regs->tf_esp = (int)fp; 585 regs->tf_eip = __kernel_sigreturn; 586 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 587 regs->tf_cs = _ucodesel; 588 regs->tf_ds = _udatasel; 589 regs->tf_es = _udatasel; 590 regs->tf_fs = _udatasel; 591 regs->tf_ss = _udatasel; 592 PROC_LOCK(p); 593 mtx_lock(&psp->ps_mtx); 594 } 595 596 /* 597 * System call to cleanup state after a signal 598 * has been taken. Reset signal mask and 599 * stack state from context left by sendsig (above). 600 * Return to previous pc and psl as specified by 601 * context left by sendsig. Check carefully to 602 * make sure that the user has not modified the 603 * psl to gain improper privileges or to cause 604 * a machine fault. 605 */ 606 int 607 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 608 { 609 struct l_sigframe frame; 610 struct trapframe *regs; 611 l_sigset_t lmask; 612 sigset_t bmask; 613 int eflags; 614 ksiginfo_t ksi; 615 616 regs = td->td_frame; 617 618 /* 619 * The trampoline code hands us the sigframe. 620 * It is unsafe to keep track of it ourselves, in the event that a 621 * program jumps out of a signal handler. 622 */ 623 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 624 return (EFAULT); 625 626 /* Check for security violations. */ 627 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 628 eflags = frame.sf_sc.sc_eflags; 629 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 630 return (EINVAL); 631 632 /* 633 * Don't allow users to load a valid privileged %cs. Let the 634 * hardware check for invalid selectors, excess privilege in 635 * other selectors, invalid %eip's and invalid %esp's. 636 */ 637 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 638 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 639 ksiginfo_init_trap(&ksi); 640 ksi.ksi_signo = SIGBUS; 641 ksi.ksi_code = BUS_OBJERR; 642 ksi.ksi_trapno = T_PROTFLT; 643 ksi.ksi_addr = (void *)regs->tf_eip; 644 trapsignal(td, &ksi); 645 return (EINVAL); 646 } 647 648 lmask.__mask = frame.sf_sc.sc_mask; 649 linux_to_bsd_sigset(&lmask, &bmask); 650 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 651 652 /* Restore signal context. */ 653 /* %gs was restored by the trampoline. */ 654 regs->tf_fs = frame.sf_sc.sc_fs; 655 regs->tf_es = frame.sf_sc.sc_es; 656 regs->tf_ds = frame.sf_sc.sc_ds; 657 regs->tf_edi = frame.sf_sc.sc_edi; 658 regs->tf_esi = frame.sf_sc.sc_esi; 659 regs->tf_ebp = frame.sf_sc.sc_ebp; 660 regs->tf_ebx = frame.sf_sc.sc_ebx; 661 regs->tf_edx = frame.sf_sc.sc_edx; 662 regs->tf_ecx = frame.sf_sc.sc_ecx; 663 regs->tf_eax = frame.sf_sc.sc_eax; 664 regs->tf_eip = frame.sf_sc.sc_eip; 665 regs->tf_cs = frame.sf_sc.sc_cs; 666 regs->tf_eflags = eflags; 667 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 668 regs->tf_ss = frame.sf_sc.sc_ss; 669 670 return (EJUSTRETURN); 671 } 672 673 /* 674 * System call to cleanup state after a signal 675 * has been taken. Reset signal mask and 676 * stack state from context left by rt_sendsig (above). 677 * Return to previous pc and psl as specified by 678 * context left by sendsig. Check carefully to 679 * make sure that the user has not modified the 680 * psl to gain improper privileges or to cause 681 * a machine fault. 682 */ 683 int 684 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 685 { 686 struct l_ucontext uc; 687 struct l_sigcontext *context; 688 sigset_t bmask; 689 l_stack_t *lss; 690 stack_t ss; 691 struct trapframe *regs; 692 int eflags; 693 ksiginfo_t ksi; 694 695 regs = td->td_frame; 696 697 /* 698 * The trampoline code hands us the ucontext. 699 * It is unsafe to keep track of it ourselves, in the event that a 700 * program jumps out of a signal handler. 701 */ 702 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 703 return (EFAULT); 704 705 context = &uc.uc_mcontext; 706 707 /* Check for security violations. */ 708 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 709 eflags = context->sc_eflags; 710 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 711 return (EINVAL); 712 713 /* 714 * Don't allow users to load a valid privileged %cs. Let the 715 * hardware check for invalid selectors, excess privilege in 716 * other selectors, invalid %eip's and invalid %esp's. 717 */ 718 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 719 if (!CS_SECURE(context->sc_cs)) { 720 ksiginfo_init_trap(&ksi); 721 ksi.ksi_signo = SIGBUS; 722 ksi.ksi_code = BUS_OBJERR; 723 ksi.ksi_trapno = T_PROTFLT; 724 ksi.ksi_addr = (void *)regs->tf_eip; 725 trapsignal(td, &ksi); 726 return (EINVAL); 727 } 728 729 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 730 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 731 732 /* Restore signal context. */ 733 /* %gs was restored by the trampoline. */ 734 regs->tf_fs = context->sc_fs; 735 regs->tf_es = context->sc_es; 736 regs->tf_ds = context->sc_ds; 737 regs->tf_edi = context->sc_edi; 738 regs->tf_esi = context->sc_esi; 739 regs->tf_ebp = context->sc_ebp; 740 regs->tf_ebx = context->sc_ebx; 741 regs->tf_edx = context->sc_edx; 742 regs->tf_ecx = context->sc_ecx; 743 regs->tf_eax = context->sc_eax; 744 regs->tf_eip = context->sc_eip; 745 regs->tf_cs = context->sc_cs; 746 regs->tf_eflags = eflags; 747 regs->tf_esp = context->sc_esp_at_signal; 748 regs->tf_ss = context->sc_ss; 749 750 /* Call sigaltstack & ignore results. */ 751 lss = &uc.uc_stack; 752 ss.ss_sp = PTRIN(lss->ss_sp); 753 ss.ss_size = lss->ss_size; 754 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 755 756 (void)kern_sigaltstack(td, &ss, NULL); 757 758 return (EJUSTRETURN); 759 } 760 761 static int 762 linux_fetch_syscall_args(struct thread *td) 763 { 764 struct proc *p; 765 struct trapframe *frame; 766 struct syscall_args *sa; 767 768 p = td->td_proc; 769 frame = td->td_frame; 770 sa = &td->td_sa; 771 772 sa->code = frame->tf_eax; 773 sa->original_code = sa->code; 774 sa->args[0] = frame->tf_ebx; 775 sa->args[1] = frame->tf_ecx; 776 sa->args[2] = frame->tf_edx; 777 sa->args[3] = frame->tf_esi; 778 sa->args[4] = frame->tf_edi; 779 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 780 781 if (sa->code >= p->p_sysent->sv_size) 782 /* nosys */ 783 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 784 else 785 sa->callp = &p->p_sysent->sv_table[sa->code]; 786 787 td->td_retval[0] = 0; 788 td->td_retval[1] = frame->tf_edx; 789 790 return (0); 791 } 792 793 static void 794 linux_set_syscall_retval(struct thread *td, int error) 795 { 796 struct trapframe *frame = td->td_frame; 797 798 cpu_set_syscall_retval(td, error); 799 800 if (__predict_false(error != 0)) { 801 if (error != ERESTART && error != EJUSTRETURN) 802 frame->tf_eax = bsd_to_linux_errno(error); 803 } 804 } 805 806 /* 807 * exec_setregs may initialize some registers differently than Linux 808 * does, thus potentially confusing Linux binaries. If necessary, we 809 * override the exec_setregs default(s) here. 810 */ 811 static void 812 linux_exec_setregs(struct thread *td, struct image_params *imgp, 813 uintptr_t stack) 814 { 815 struct pcb *pcb = td->td_pcb; 816 817 exec_setregs(td, imgp, stack); 818 819 /* Linux sets %gs to 0, we default to _udatasel. */ 820 pcb->pcb_gs = 0; 821 load_gs(0); 822 823 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 824 } 825 826 struct sysentvec linux_sysvec = { 827 .sv_size = LINUX_SYS_MAXSYSCALL, 828 .sv_table = linux_sysent, 829 .sv_transtrap = linux_translate_traps, 830 .sv_fixup = linux_fixup, 831 .sv_sendsig = linux_sendsig, 832 .sv_sigcode = &_binary_linux_vdso_so_o_start, 833 .sv_szsigcode = &linux_szsigcode, 834 .sv_name = "Linux a.out", 835 .sv_coredump = NULL, 836 .sv_imgact_try = linux_exec_imgact_try, 837 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 838 .sv_minuser = VM_MIN_ADDRESS, 839 .sv_maxuser = VM_MAXUSER_ADDRESS, 840 .sv_usrstack = LINUX_USRSTACK, 841 .sv_psstrings = PS_STRINGS, 842 .sv_stackprot = VM_PROT_ALL, 843 .sv_copyout_strings = exec_copyout_strings, 844 .sv_setregs = linux_exec_setregs, 845 .sv_fixlimit = NULL, 846 .sv_maxssiz = NULL, 847 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 | 848 SV_SIG_DISCIGN | SV_SIG_WAITNDQ, 849 .sv_set_syscall_retval = linux_set_syscall_retval, 850 .sv_fetch_syscall_args = linux_fetch_syscall_args, 851 .sv_syscallnames = NULL, 852 .sv_schedtail = linux_schedtail, 853 .sv_thread_detach = linux_thread_detach, 854 .sv_trap = NULL, 855 .sv_onexec = linux_on_exec_vmspace, 856 .sv_onexit = linux_on_exit, 857 .sv_ontdexit = linux_thread_dtor, 858 .sv_setid_allowed = &linux_setid_allowed_query, 859 }; 860 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 861 862 struct sysentvec elf_linux_sysvec = { 863 .sv_size = LINUX_SYS_MAXSYSCALL, 864 .sv_table = linux_sysent, 865 .sv_transtrap = linux_translate_traps, 866 .sv_fixup = linux_fixup_elf, 867 .sv_sendsig = linux_sendsig, 868 .sv_sigcode = &_binary_linux_vdso_so_o_start, 869 .sv_szsigcode = &linux_szsigcode, 870 .sv_name = "Linux ELF32", 871 .sv_coredump = elf32_coredump, 872 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 873 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 874 .sv_elf_core_prepare_notes = elf32_prepare_notes, 875 .sv_imgact_try = linux_exec_imgact_try, 876 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 877 .sv_minuser = VM_MIN_ADDRESS, 878 .sv_maxuser = VM_MAXUSER_ADDRESS, 879 .sv_usrstack = LINUX_USRSTACK, 880 .sv_psstrings = LINUX_PS_STRINGS, 881 .sv_stackprot = VM_PROT_ALL, 882 .sv_copyout_auxargs = linux_copyout_auxargs, 883 .sv_copyout_strings = linux_copyout_strings, 884 .sv_setregs = linux_exec_setregs, 885 .sv_fixlimit = NULL, 886 .sv_maxssiz = NULL, 887 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP | 888 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 889 .sv_set_syscall_retval = linux_set_syscall_retval, 890 .sv_fetch_syscall_args = linux_fetch_syscall_args, 891 .sv_syscallnames = NULL, 892 .sv_shared_page_base = LINUX_SHAREDPAGE, 893 .sv_shared_page_len = PAGE_SIZE, 894 .sv_schedtail = linux_schedtail, 895 .sv_thread_detach = linux_thread_detach, 896 .sv_trap = NULL, 897 .sv_onexec = linux_on_exec_vmspace, 898 .sv_onexit = linux_on_exit, 899 .sv_ontdexit = linux_thread_dtor, 900 .sv_setid_allowed = &linux_setid_allowed_query, 901 }; 902 903 static int 904 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 905 { 906 int error = 0; 907 908 if (SV_PROC_FLAG(p, SV_SHP) != 0) 909 error = linux_map_vdso(p, linux_vdso_obj, 910 linux_vdso_base, LINUX_VDSOPAGE_SIZE, imgp); 911 if (error == 0) 912 linux_on_exec(p, imgp); 913 return (error); 914 } 915 916 /* 917 * linux_vdso_install() and linux_exec_sysvec_init() must be called 918 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 919 */ 920 static void 921 linux_exec_sysvec_init(void *param) 922 { 923 l_uintptr_t *ktimekeep_base, *ktsc_selector; 924 struct sysentvec *sv; 925 ptrdiff_t tkoff; 926 927 sv = param; 928 /* Fill timekeep_base */ 929 exec_sysvec_init(sv); 930 931 tkoff = kern_timekeep_base - linux_vdso_base; 932 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 933 *ktimekeep_base = sv->sv_timekeep_base; 934 935 tkoff = kern_tsc_selector - linux_vdso_base; 936 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 937 *ktsc_selector = linux_vdso_tsc_selector_idx(); 938 if (bootverbose) 939 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 940 } 941 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 942 linux_exec_sysvec_init, &elf_linux_sysvec); 943 944 static void 945 linux_vdso_install(const void *param) 946 { 947 char *vdso_start = &_binary_linux_vdso_so_o_start; 948 char *vdso_end = &_binary_linux_vdso_so_o_end; 949 950 linux_szsigcode = vdso_end - vdso_start; 951 MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE); 952 953 linux_vdso_base = LINUX_VDSOPAGE; 954 955 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 956 957 linux_vdso_obj = __elfN(linux_shared_page_init) 958 (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 959 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 960 961 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 962 } 963 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 964 linux_vdso_install, NULL); 965 966 static void 967 linux_vdso_deinstall(const void *param) 968 { 969 970 __elfN(linux_shared_page_fini)(linux_vdso_obj, 971 linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 972 } 973 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 974 linux_vdso_deinstall, NULL); 975 976 static void 977 linux_vdso_reloc(char *mapping, Elf_Addr offset) 978 { 979 const Elf_Shdr *shdr; 980 const Elf_Rel *rel; 981 const Elf_Ehdr *ehdr; 982 Elf_Addr *where; 983 Elf_Size rtype, symidx; 984 Elf_Addr addr, addend; 985 int i, relcnt; 986 987 MPASS(offset != 0); 988 989 relcnt = 0; 990 ehdr = (const Elf_Ehdr *)mapping; 991 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 992 for (i = 0; i < ehdr->e_shnum; i++) 993 { 994 switch (shdr[i].sh_type) { 995 case SHT_REL: 996 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 997 relcnt = shdr[i].sh_size / sizeof(*rel); 998 break; 999 case SHT_RELA: 1000 printf("Linux i386 vDSO: unexpected Rela section\n"); 1001 break; 1002 } 1003 } 1004 1005 for (i = 0; i < relcnt; i++, rel++) { 1006 where = (Elf_Addr *)(mapping + rel->r_offset); 1007 addend = *where; 1008 rtype = ELF_R_TYPE(rel->r_info); 1009 symidx = ELF_R_SYM(rel->r_info); 1010 1011 switch (rtype) { 1012 case R_386_NONE: /* none */ 1013 break; 1014 1015 case R_386_RELATIVE: /* B + A */ 1016 addr = (Elf_Addr)PTROUT(offset + addend); 1017 if (*where != addr) 1018 *where = addr; 1019 break; 1020 1021 case R_386_IRELATIVE: 1022 printf("Linux i386 vDSO: unexpected ifunc relocation, " 1023 "symbol index %d\n", symidx); 1024 break; 1025 default: 1026 printf("Linux i386 vDSO: unexpected relocation type %d, " 1027 "symbol index %d\n", rtype, symidx); 1028 } 1029 } 1030 } 1031 1032 static char GNU_ABI_VENDOR[] = "GNU"; 1033 static int GNULINUX_ABI_DESC = 0; 1034 1035 static bool 1036 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1037 { 1038 const Elf32_Word *desc; 1039 uintptr_t p; 1040 1041 p = (uintptr_t)(note + 1); 1042 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1043 1044 desc = (const Elf32_Word *)p; 1045 if (desc[0] != GNULINUX_ABI_DESC) 1046 return (false); 1047 1048 /* 1049 * For Linux we encode osrel using the Linux convention of 1050 * (version << 16) | (major << 8) | (minor) 1051 * See macro in linux_mib.h 1052 */ 1053 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1054 1055 return (true); 1056 } 1057 1058 static Elf_Brandnote linux_brandnote = { 1059 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1060 .hdr.n_descsz = 16, /* XXX at least 16 */ 1061 .hdr.n_type = 1, 1062 .vendor = GNU_ABI_VENDOR, 1063 .flags = BN_TRANSLATE_OSREL, 1064 .trans_osrel = linux_trans_osrel 1065 }; 1066 1067 static Elf32_Brandinfo linux_brand = { 1068 .brand = ELFOSABI_LINUX, 1069 .machine = EM_386, 1070 .compat_3_brand = "Linux", 1071 .emul_path = linux_emul_path, 1072 .interp_path = "/lib/ld-linux.so.1", 1073 .sysvec = &elf_linux_sysvec, 1074 .interp_newpath = NULL, 1075 .brand_note = &linux_brandnote, 1076 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1077 }; 1078 1079 static Elf32_Brandinfo linux_glibc2brand = { 1080 .brand = ELFOSABI_LINUX, 1081 .machine = EM_386, 1082 .compat_3_brand = "Linux", 1083 .emul_path = linux_emul_path, 1084 .interp_path = "/lib/ld-linux.so.2", 1085 .sysvec = &elf_linux_sysvec, 1086 .interp_newpath = NULL, 1087 .brand_note = &linux_brandnote, 1088 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1089 }; 1090 1091 static Elf32_Brandinfo linux_muslbrand = { 1092 .brand = ELFOSABI_LINUX, 1093 .machine = EM_386, 1094 .compat_3_brand = "Linux", 1095 .emul_path = linux_emul_path, 1096 .interp_path = "/lib/ld-musl-i386.so.1", 1097 .sysvec = &elf_linux_sysvec, 1098 .interp_newpath = NULL, 1099 .brand_note = &linux_brandnote, 1100 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1101 LINUX_BI_FUTEX_REQUEUE 1102 }; 1103 1104 Elf32_Brandinfo *linux_brandlist[] = { 1105 &linux_brand, 1106 &linux_glibc2brand, 1107 &linux_muslbrand, 1108 NULL 1109 }; 1110 1111 static int 1112 linux_elf_modevent(module_t mod, int type, void *data) 1113 { 1114 Elf32_Brandinfo **brandinfo; 1115 int error; 1116 struct linux_ioctl_handler **lihp; 1117 1118 error = 0; 1119 1120 switch(type) { 1121 case MOD_LOAD: 1122 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1123 ++brandinfo) 1124 if (elf32_insert_brand_entry(*brandinfo) < 0) 1125 error = EINVAL; 1126 if (error == 0) { 1127 SET_FOREACH(lihp, linux_ioctl_handler_set) 1128 linux_ioctl_register_handler(*lihp); 1129 linux_dev_shm_create(); 1130 linux_osd_jail_register(); 1131 stclohz = (stathz ? stathz : hz); 1132 if (bootverbose) 1133 printf("Linux ELF exec handler installed\n"); 1134 } else 1135 printf("cannot insert Linux ELF brand handler\n"); 1136 break; 1137 case MOD_UNLOAD: 1138 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1139 ++brandinfo) 1140 if (elf32_brand_inuse(*brandinfo)) 1141 error = EBUSY; 1142 if (error == 0) { 1143 for (brandinfo = &linux_brandlist[0]; 1144 *brandinfo != NULL; ++brandinfo) 1145 if (elf32_remove_brand_entry(*brandinfo) < 0) 1146 error = EINVAL; 1147 } 1148 if (error == 0) { 1149 SET_FOREACH(lihp, linux_ioctl_handler_set) 1150 linux_ioctl_unregister_handler(*lihp); 1151 linux_dev_shm_destroy(); 1152 linux_osd_jail_deregister(); 1153 if (bootverbose) 1154 printf("Linux ELF exec handler removed\n"); 1155 } else 1156 printf("Could not deinstall ELF interpreter entry\n"); 1157 break; 1158 default: 1159 return (EOPNOTSUPP); 1160 } 1161 return (error); 1162 } 1163 1164 static moduledata_t linux_elf_mod = { 1165 "linuxelf", 1166 linux_elf_modevent, 1167 0 1168 }; 1169 1170 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1171 FEATURE(linux, "Linux 32bit support"); 1172