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_fork.h> 70 #include <compat/linux/linux_ioctl.h> 71 #include <compat/linux/linux_mib.h> 72 #include <compat/linux/linux_misc.h> 73 #include <compat/linux/linux_signal.h> 74 #include <compat/linux/linux_util.h> 75 #include <compat/linux/linux_vdso.h> 76 77 MODULE_VERSION(linux, 1); 78 79 #define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2 80 #define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - LINUX_VDSOPAGE_SIZE) 81 #define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE) 82 /* 83 * PAGE_SIZE - the size 84 * of the native SHAREDPAGE 85 */ 86 #define LINUX_USRSTACK LINUX_SHAREDPAGE 87 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 88 89 static int linux_szsigcode; 90 static vm_object_t linux_vdso_obj; 91 static char *linux_vdso_mapping; 92 extern char _binary_linux_vdso_so_o_start; 93 extern char _binary_linux_vdso_so_o_end; 94 static vm_offset_t linux_vdso_base; 95 96 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 97 98 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 99 100 static int linux_fixup(uintptr_t *stack_base, 101 struct image_params *iparams); 102 static int linux_fixup_elf(uintptr_t *stack_base, 103 struct image_params *iparams); 104 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 105 static void linux_exec_setregs(struct thread *td, 106 struct image_params *imgp, uintptr_t stack); 107 static void linux_exec_sysvec_init(void *param); 108 static int linux_on_exec_vmspace(struct proc *p, 109 struct image_params *imgp); 110 static int linux_copyout_strings(struct image_params *imgp, 111 uintptr_t *stack_base); 112 static void linux_set_fork_retval(struct thread *td); 113 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 114 static void linux_vdso_install(const void *param); 115 static void linux_vdso_deinstall(const void *param); 116 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 117 118 #define LINUX_T_UNKNOWN 255 119 static int _bsd_to_linux_trapcode[] = { 120 LINUX_T_UNKNOWN, /* 0 */ 121 6, /* 1 T_PRIVINFLT */ 122 LINUX_T_UNKNOWN, /* 2 */ 123 3, /* 3 T_BPTFLT */ 124 LINUX_T_UNKNOWN, /* 4 */ 125 LINUX_T_UNKNOWN, /* 5 */ 126 16, /* 6 T_ARITHTRAP */ 127 254, /* 7 T_ASTFLT */ 128 LINUX_T_UNKNOWN, /* 8 */ 129 13, /* 9 T_PROTFLT */ 130 1, /* 10 T_TRCTRAP */ 131 LINUX_T_UNKNOWN, /* 11 */ 132 14, /* 12 T_PAGEFLT */ 133 LINUX_T_UNKNOWN, /* 13 */ 134 17, /* 14 T_ALIGNFLT */ 135 LINUX_T_UNKNOWN, /* 15 */ 136 LINUX_T_UNKNOWN, /* 16 */ 137 LINUX_T_UNKNOWN, /* 17 */ 138 0, /* 18 T_DIVIDE */ 139 2, /* 19 T_NMI */ 140 4, /* 20 T_OFLOW */ 141 5, /* 21 T_BOUND */ 142 7, /* 22 T_DNA */ 143 8, /* 23 T_DOUBLEFLT */ 144 9, /* 24 T_FPOPFLT */ 145 10, /* 25 T_TSSFLT */ 146 11, /* 26 T_SEGNPFLT */ 147 12, /* 27 T_STKFLT */ 148 18, /* 28 T_MCHK */ 149 19, /* 29 T_XMMFLT */ 150 15 /* 30 T_RESERVED */ 151 }; 152 #define bsd_to_linux_trapcode(code) \ 153 ((code)<nitems(_bsd_to_linux_trapcode)? \ 154 _bsd_to_linux_trapcode[(code)]: \ 155 LINUX_T_UNKNOWN) 156 157 LINUX_VDSO_SYM_CHAR(linux_platform); 158 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 159 LINUX_VDSO_SYM_INTPTR(__kernel_sigreturn); 160 LINUX_VDSO_SYM_INTPTR(__kernel_rt_sigreturn); 161 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 162 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 163 164 /* 165 * If FreeBSD & Linux have a difference of opinion about what a trap 166 * means, deal with it here. 167 * 168 * MPSAFE 169 */ 170 static int 171 linux_translate_traps(int signal, int trap_code) 172 { 173 if (signal != SIGBUS) 174 return (signal); 175 switch (trap_code) { 176 case T_PROTFLT: 177 case T_TSSFLT: 178 case T_DOUBLEFLT: 179 case T_PAGEFLT: 180 return (SIGSEGV); 181 default: 182 return (signal); 183 } 184 } 185 186 static int 187 linux_fixup(uintptr_t *stack_base, struct image_params *imgp) 188 { 189 register_t *base, *argv, *envp; 190 191 base = (register_t *)*stack_base; 192 argv = base; 193 envp = base + (imgp->args->argc + 1); 194 base--; 195 suword(base, (intptr_t)envp); 196 base--; 197 suword(base, (intptr_t)argv); 198 base--; 199 suword(base, imgp->args->argc); 200 *stack_base = (uintptr_t)base; 201 return (0); 202 } 203 204 static int 205 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 206 { 207 struct proc *p; 208 Elf32_Auxargs *args; 209 Elf32_Auxinfo *argarray, *pos; 210 struct ps_strings *arginfo; 211 int error, issetugid; 212 213 p = imgp->proc; 214 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 215 arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); 216 args = (Elf32_Auxargs *)imgp->auxargs; 217 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 218 M_WAITOK | M_ZERO); 219 220 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 221 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 222 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 223 224 /* 225 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 226 * as it has appeared in the 2.4.0-rc7 first time. 227 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 228 * glibc falls back to the hard-coded CLK_TCK value when aux entry 229 * is not present. 230 * Also see linux_times() implementation. 231 */ 232 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 233 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 234 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 235 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 236 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 237 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 238 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 239 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 240 AUXARGS_ENTRY(pos, AT_BASE, args->base); 241 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 242 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 243 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 244 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 245 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 246 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 247 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); 248 if (imgp->execpathp != 0) 249 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); 250 if (args->execfd != -1) 251 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 252 AUXARGS_ENTRY(pos, AT_NULL, 0); 253 254 free(imgp->auxargs, M_TEMP); 255 imgp->auxargs = NULL; 256 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 257 258 error = copyout(argarray, (void *)base, 259 sizeof(*argarray) * LINUX_AT_COUNT); 260 free(argarray, M_TEMP); 261 return (error); 262 } 263 264 static int 265 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 266 { 267 register_t *base; 268 269 base = (register_t *)*stack_base; 270 base--; 271 if (suword(base, (register_t)imgp->args->argc) == -1) 272 return (EFAULT); 273 *stack_base = (uintptr_t)base; 274 return (0); 275 } 276 277 /* 278 * Copied from kern/kern_exec.c 279 */ 280 static int 281 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 282 { 283 int argc, envc, error; 284 char **vectp; 285 char *stringp; 286 uintptr_t destp, ustringp; 287 struct ps_strings *arginfo; 288 char canary[LINUX_AT_RANDOM_LEN]; 289 size_t execpath_len; 290 struct proc *p; 291 292 p = imgp->proc; 293 arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); 294 destp = (uintptr_t)arginfo; 295 296 if (imgp->execpath != NULL && imgp->auxargs != NULL) { 297 execpath_len = strlen(imgp->execpath) + 1; 298 destp -= execpath_len; 299 destp = rounddown2(destp, sizeof(void *)); 300 imgp->execpathp = (void *)destp; 301 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 302 if (error != 0) 303 return (error); 304 } 305 306 /* Prepare the canary for SSP. */ 307 arc4rand(canary, sizeof(canary), 0); 308 destp -= roundup(sizeof(canary), sizeof(void *)); 309 imgp->canary = (void *)destp; 310 error = copyout(canary, imgp->canary, sizeof(canary)); 311 if (error != 0) 312 return (error); 313 314 /* Allocate room for the argument and environment strings. */ 315 destp -= ARG_MAX - imgp->args->stringspace; 316 destp = rounddown2(destp, sizeof(void *)); 317 ustringp = destp; 318 319 if (imgp->auxargs) { 320 /* 321 * Allocate room on the stack for the ELF auxargs 322 * array. It has LINUX_AT_COUNT entries. 323 */ 324 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 325 destp = rounddown2(destp, sizeof(void *)); 326 } 327 328 vectp = (char **)destp; 329 330 /* 331 * Allocate room for the argv[] and env vectors including the 332 * terminating NULL pointers. 333 */ 334 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 335 336 /* vectp also becomes our initial stack base. */ 337 *stack_base = (uintptr_t)vectp; 338 339 stringp = imgp->args->begin_argv; 340 argc = imgp->args->argc; 341 envc = imgp->args->envc; 342 343 /* Copy out strings - arguments and environment. */ 344 error = copyout(stringp, (void *)ustringp, 345 ARG_MAX - imgp->args->stringspace); 346 if (error != 0) 347 return (error); 348 349 /* Fill in "ps_strings" struct for ps, w, etc. */ 350 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || 351 suword(&arginfo->ps_nargvstr, argc) != 0) 352 return (EFAULT); 353 354 /* Fill in argument portion of vector table. */ 355 for (; argc > 0; --argc) { 356 if (suword(vectp++, ustringp) != 0) 357 return (EFAULT); 358 while (*stringp++ != 0) 359 ustringp++; 360 ustringp++; 361 } 362 363 /* A null vector table pointer separates the argp's from the envp's. */ 364 if (suword(vectp++, 0) != 0) 365 return (EFAULT); 366 367 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || 368 suword(&arginfo->ps_nenvstr, envc) != 0) 369 return (EFAULT); 370 371 /* Fill in environment portion of vector table. */ 372 for (; envc > 0; --envc) { 373 if (suword(vectp++, ustringp) != 0) 374 return (EFAULT); 375 while (*stringp++ != 0) 376 ustringp++; 377 ustringp++; 378 } 379 380 /* The end of the vector table is a null pointer. */ 381 if (suword(vectp, 0) != 0) 382 return (EFAULT); 383 384 if (imgp->auxargs) { 385 vectp++; 386 error = imgp->sysent->sv_copyout_auxargs(imgp, 387 (uintptr_t)vectp); 388 if (error != 0) 389 return (error); 390 } 391 392 return (0); 393 } 394 395 static void 396 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 397 { 398 struct thread *td = curthread; 399 struct proc *p = td->td_proc; 400 struct sigacts *psp; 401 struct trapframe *regs; 402 struct l_rt_sigframe *fp, frame; 403 int sig, code; 404 int oonstack; 405 406 sig = ksi->ksi_signo; 407 code = ksi->ksi_code; 408 PROC_LOCK_ASSERT(p, MA_OWNED); 409 psp = p->p_sigacts; 410 mtx_assert(&psp->ps_mtx, MA_OWNED); 411 regs = td->td_frame; 412 oonstack = sigonstack(regs->tf_esp); 413 414 /* Allocate space for the signal handler context. */ 415 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 416 SIGISMEMBER(psp->ps_sigonstack, sig)) { 417 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 418 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 419 } else 420 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 421 mtx_unlock(&psp->ps_mtx); 422 423 /* Build the argument list for the signal handler. */ 424 sig = bsd_to_linux_signal(sig); 425 426 bzero(&frame, sizeof(frame)); 427 428 frame.sf_handler = catcher; 429 frame.sf_sig = sig; 430 frame.sf_siginfo = &fp->sf_si; 431 frame.sf_ucontext = &fp->sf_sc; 432 433 /* Fill in POSIX parts. */ 434 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 435 436 /* Build the signal context to be used by sigreturn. */ 437 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 438 frame.sf_sc.uc_link = NULL; /* XXX ??? */ 439 440 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 441 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 442 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 443 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 444 PROC_UNLOCK(p); 445 446 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 447 448 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 449 frame.sf_sc.uc_mcontext.sc_gs = rgs(); 450 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 451 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 452 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 453 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_edi; 454 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_esi; 455 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_ebp; 456 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_ebx; 457 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_esp; 458 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_edx; 459 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_ecx; 460 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_eax; 461 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_eip; 462 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 463 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_eflags; 464 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 465 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 466 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 467 frame.sf_sc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 468 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 469 470 if (copyout(&frame, fp, sizeof(frame)) != 0) { 471 /* 472 * Process has trashed its stack; give it an illegal 473 * instruction to halt it in its tracks. 474 */ 475 PROC_LOCK(p); 476 sigexit(td, SIGILL); 477 } 478 479 /* Build context to run handler in. */ 480 regs->tf_esp = (int)fp; 481 regs->tf_eip = __kernel_rt_sigreturn; 482 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 483 regs->tf_cs = _ucodesel; 484 regs->tf_ds = _udatasel; 485 regs->tf_es = _udatasel; 486 regs->tf_fs = _udatasel; 487 regs->tf_ss = _udatasel; 488 PROC_LOCK(p); 489 mtx_lock(&psp->ps_mtx); 490 } 491 492 /* 493 * Send an interrupt to process. 494 * 495 * Stack is set up to allow sigcode stored 496 * in u. to call routine, followed by kcall 497 * to sigreturn routine below. After sigreturn 498 * resets the signal mask, the stack, and the 499 * frame pointer, it returns to the user 500 * specified pc, psl. 501 */ 502 static void 503 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 504 { 505 struct thread *td = curthread; 506 struct proc *p = td->td_proc; 507 struct sigacts *psp; 508 struct trapframe *regs; 509 struct l_sigframe *fp, frame; 510 l_sigset_t lmask; 511 int sig, code; 512 int oonstack; 513 514 PROC_LOCK_ASSERT(p, MA_OWNED); 515 psp = p->p_sigacts; 516 sig = ksi->ksi_signo; 517 code = ksi->ksi_code; 518 mtx_assert(&psp->ps_mtx, MA_OWNED); 519 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 520 /* Signal handler installed with SA_SIGINFO. */ 521 linux_rt_sendsig(catcher, ksi, mask); 522 return; 523 } 524 regs = td->td_frame; 525 oonstack = sigonstack(regs->tf_esp); 526 527 /* Allocate space for the signal handler context. */ 528 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 529 SIGISMEMBER(psp->ps_sigonstack, sig)) { 530 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 531 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 532 } else 533 fp = (struct l_sigframe *)regs->tf_esp - 1; 534 mtx_unlock(&psp->ps_mtx); 535 PROC_UNLOCK(p); 536 537 /* Build the argument list for the signal handler. */ 538 sig = bsd_to_linux_signal(sig); 539 540 bzero(&frame, sizeof(frame)); 541 542 frame.sf_handler = catcher; 543 frame.sf_sig = sig; 544 545 bsd_to_linux_sigset(mask, &lmask); 546 547 /* Build the signal context to be used by sigreturn. */ 548 frame.sf_sc.sc_mask = lmask.__mask; 549 frame.sf_sc.sc_gs = rgs(); 550 frame.sf_sc.sc_fs = regs->tf_fs; 551 frame.sf_sc.sc_es = regs->tf_es; 552 frame.sf_sc.sc_ds = regs->tf_ds; 553 frame.sf_sc.sc_edi = regs->tf_edi; 554 frame.sf_sc.sc_esi = regs->tf_esi; 555 frame.sf_sc.sc_ebp = regs->tf_ebp; 556 frame.sf_sc.sc_ebx = regs->tf_ebx; 557 frame.sf_sc.sc_esp = regs->tf_esp; 558 frame.sf_sc.sc_edx = regs->tf_edx; 559 frame.sf_sc.sc_ecx = regs->tf_ecx; 560 frame.sf_sc.sc_eax = regs->tf_eax; 561 frame.sf_sc.sc_eip = regs->tf_eip; 562 frame.sf_sc.sc_cs = regs->tf_cs; 563 frame.sf_sc.sc_eflags = regs->tf_eflags; 564 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 565 frame.sf_sc.sc_ss = regs->tf_ss; 566 frame.sf_sc.sc_err = regs->tf_err; 567 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 568 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 569 570 frame.sf_extramask[0] = lmask.__mask; 571 572 if (copyout(&frame, fp, sizeof(frame)) != 0) { 573 /* 574 * Process has trashed its stack; give it an illegal 575 * instruction to halt it in its tracks. 576 */ 577 PROC_LOCK(p); 578 sigexit(td, SIGILL); 579 } 580 581 /* Build context to run handler in. */ 582 regs->tf_esp = (int)fp; 583 regs->tf_eip = __kernel_sigreturn; 584 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 585 regs->tf_cs = _ucodesel; 586 regs->tf_ds = _udatasel; 587 regs->tf_es = _udatasel; 588 regs->tf_fs = _udatasel; 589 regs->tf_ss = _udatasel; 590 PROC_LOCK(p); 591 mtx_lock(&psp->ps_mtx); 592 } 593 594 /* 595 * System call to cleanup state after a signal 596 * has been taken. Reset signal mask and 597 * stack state from context left by sendsig (above). 598 * Return to previous pc and psl as specified by 599 * context left by sendsig. Check carefully to 600 * make sure that the user has not modified the 601 * psl to gain improper privileges or to cause 602 * a machine fault. 603 */ 604 int 605 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 606 { 607 struct l_sigframe frame; 608 struct trapframe *regs; 609 l_sigset_t lmask; 610 sigset_t bmask; 611 int eflags; 612 ksiginfo_t ksi; 613 614 regs = td->td_frame; 615 616 /* 617 * The trampoline code hands us the sigframe. 618 * It is unsafe to keep track of it ourselves, in the event that a 619 * program jumps out of a signal handler. 620 */ 621 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 622 return (EFAULT); 623 624 /* Check for security violations. */ 625 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 626 eflags = frame.sf_sc.sc_eflags; 627 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 628 return (EINVAL); 629 630 /* 631 * Don't allow users to load a valid privileged %cs. Let the 632 * hardware check for invalid selectors, excess privilege in 633 * other selectors, invalid %eip's and invalid %esp's. 634 */ 635 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 636 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 637 ksiginfo_init_trap(&ksi); 638 ksi.ksi_signo = SIGBUS; 639 ksi.ksi_code = BUS_OBJERR; 640 ksi.ksi_trapno = T_PROTFLT; 641 ksi.ksi_addr = (void *)regs->tf_eip; 642 trapsignal(td, &ksi); 643 return (EINVAL); 644 } 645 646 lmask.__mask = frame.sf_sc.sc_mask; 647 linux_to_bsd_sigset(&lmask, &bmask); 648 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 649 650 /* Restore signal context. */ 651 /* %gs was restored by the trampoline. */ 652 regs->tf_fs = frame.sf_sc.sc_fs; 653 regs->tf_es = frame.sf_sc.sc_es; 654 regs->tf_ds = frame.sf_sc.sc_ds; 655 regs->tf_edi = frame.sf_sc.sc_edi; 656 regs->tf_esi = frame.sf_sc.sc_esi; 657 regs->tf_ebp = frame.sf_sc.sc_ebp; 658 regs->tf_ebx = frame.sf_sc.sc_ebx; 659 regs->tf_edx = frame.sf_sc.sc_edx; 660 regs->tf_ecx = frame.sf_sc.sc_ecx; 661 regs->tf_eax = frame.sf_sc.sc_eax; 662 regs->tf_eip = frame.sf_sc.sc_eip; 663 regs->tf_cs = frame.sf_sc.sc_cs; 664 regs->tf_eflags = eflags; 665 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 666 regs->tf_ss = frame.sf_sc.sc_ss; 667 668 return (EJUSTRETURN); 669 } 670 671 /* 672 * System call to cleanup state after a signal 673 * has been taken. Reset signal mask and 674 * stack state from context left by rt_sendsig (above). 675 * Return to previous pc and psl as specified by 676 * context left by sendsig. Check carefully to 677 * make sure that the user has not modified the 678 * psl to gain improper privileges or to cause 679 * a machine fault. 680 */ 681 int 682 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 683 { 684 struct l_ucontext uc; 685 struct l_sigcontext *context; 686 sigset_t bmask; 687 l_stack_t *lss; 688 stack_t ss; 689 struct trapframe *regs; 690 int eflags; 691 ksiginfo_t ksi; 692 693 regs = td->td_frame; 694 695 /* 696 * The trampoline code hands us the ucontext. 697 * It is unsafe to keep track of it ourselves, in the event that a 698 * program jumps out of a signal handler. 699 */ 700 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 701 return (EFAULT); 702 703 context = &uc.uc_mcontext; 704 705 /* Check for security violations. */ 706 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 707 eflags = context->sc_eflags; 708 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 709 return (EINVAL); 710 711 /* 712 * Don't allow users to load a valid privileged %cs. Let the 713 * hardware check for invalid selectors, excess privilege in 714 * other selectors, invalid %eip's and invalid %esp's. 715 */ 716 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 717 if (!CS_SECURE(context->sc_cs)) { 718 ksiginfo_init_trap(&ksi); 719 ksi.ksi_signo = SIGBUS; 720 ksi.ksi_code = BUS_OBJERR; 721 ksi.ksi_trapno = T_PROTFLT; 722 ksi.ksi_addr = (void *)regs->tf_eip; 723 trapsignal(td, &ksi); 724 return (EINVAL); 725 } 726 727 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 728 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 729 730 /* Restore signal context. */ 731 /* %gs was restored by the trampoline. */ 732 regs->tf_fs = context->sc_fs; 733 regs->tf_es = context->sc_es; 734 regs->tf_ds = context->sc_ds; 735 regs->tf_edi = context->sc_edi; 736 regs->tf_esi = context->sc_esi; 737 regs->tf_ebp = context->sc_ebp; 738 regs->tf_ebx = context->sc_ebx; 739 regs->tf_edx = context->sc_edx; 740 regs->tf_ecx = context->sc_ecx; 741 regs->tf_eax = context->sc_eax; 742 regs->tf_eip = context->sc_eip; 743 regs->tf_cs = context->sc_cs; 744 regs->tf_eflags = eflags; 745 regs->tf_esp = context->sc_esp_at_signal; 746 regs->tf_ss = context->sc_ss; 747 748 /* Call sigaltstack & ignore results. */ 749 lss = &uc.uc_stack; 750 ss.ss_sp = PTRIN(lss->ss_sp); 751 ss.ss_size = lss->ss_size; 752 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 753 754 (void)kern_sigaltstack(td, &ss, NULL); 755 756 return (EJUSTRETURN); 757 } 758 759 static int 760 linux_fetch_syscall_args(struct thread *td) 761 { 762 struct proc *p; 763 struct trapframe *frame; 764 struct syscall_args *sa; 765 766 p = td->td_proc; 767 frame = td->td_frame; 768 sa = &td->td_sa; 769 770 sa->code = frame->tf_eax; 771 sa->original_code = sa->code; 772 sa->args[0] = frame->tf_ebx; 773 sa->args[1] = frame->tf_ecx; 774 sa->args[2] = frame->tf_edx; 775 sa->args[3] = frame->tf_esi; 776 sa->args[4] = frame->tf_edi; 777 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 778 779 if (sa->code >= p->p_sysent->sv_size) 780 /* nosys */ 781 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 782 else 783 sa->callp = &p->p_sysent->sv_table[sa->code]; 784 785 td->td_retval[0] = 0; 786 td->td_retval[1] = frame->tf_edx; 787 788 return (0); 789 } 790 791 static void 792 linux_set_syscall_retval(struct thread *td, int error) 793 { 794 struct trapframe *frame = td->td_frame; 795 796 cpu_set_syscall_retval(td, error); 797 798 if (__predict_false(error != 0)) { 799 if (error != ERESTART && error != EJUSTRETURN) 800 frame->tf_eax = bsd_to_linux_errno(error); 801 } 802 } 803 804 static void 805 linux_set_fork_retval(struct thread *td) 806 { 807 struct trapframe *frame = td->td_frame; 808 809 frame->tf_eax = 0; 810 } 811 812 /* 813 * exec_setregs may initialize some registers differently than Linux 814 * does, thus potentially confusing Linux binaries. If necessary, we 815 * override the exec_setregs default(s) here. 816 */ 817 static void 818 linux_exec_setregs(struct thread *td, struct image_params *imgp, 819 uintptr_t stack) 820 { 821 struct pcb *pcb = td->td_pcb; 822 823 exec_setregs(td, imgp, stack); 824 825 /* Linux sets %gs to 0, we default to _udatasel. */ 826 pcb->pcb_gs = 0; 827 load_gs(0); 828 829 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 830 } 831 832 struct sysentvec linux_sysvec = { 833 .sv_size = LINUX_SYS_MAXSYSCALL, 834 .sv_table = linux_sysent, 835 .sv_transtrap = linux_translate_traps, 836 .sv_fixup = linux_fixup, 837 .sv_sendsig = linux_sendsig, 838 .sv_sigcode = &_binary_linux_vdso_so_o_start, 839 .sv_szsigcode = &linux_szsigcode, 840 .sv_name = "Linux a.out", 841 .sv_coredump = NULL, 842 .sv_imgact_try = linux_exec_imgact_try, 843 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 844 .sv_minuser = VM_MIN_ADDRESS, 845 .sv_maxuser = VM_MAXUSER_ADDRESS, 846 .sv_usrstack = LINUX_USRSTACK, 847 .sv_psstrings = PS_STRINGS, 848 .sv_psstringssz = sizeof(struct ps_strings), 849 .sv_stackprot = VM_PROT_ALL, 850 .sv_copyout_strings = exec_copyout_strings, 851 .sv_setregs = linux_exec_setregs, 852 .sv_fixlimit = NULL, 853 .sv_maxssiz = NULL, 854 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 | 855 SV_SIG_DISCIGN | SV_SIG_WAITNDQ, 856 .sv_set_syscall_retval = linux_set_syscall_retval, 857 .sv_fetch_syscall_args = linux_fetch_syscall_args, 858 .sv_syscallnames = NULL, 859 .sv_schedtail = linux_schedtail, 860 .sv_thread_detach = linux_thread_detach, 861 .sv_trap = NULL, 862 .sv_onexec = linux_on_exec_vmspace, 863 .sv_onexit = linux_on_exit, 864 .sv_ontdexit = linux_thread_dtor, 865 .sv_setid_allowed = &linux_setid_allowed_query, 866 .sv_set_fork_retval = linux_set_fork_retval, 867 }; 868 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 869 870 struct sysentvec elf_linux_sysvec = { 871 .sv_size = LINUX_SYS_MAXSYSCALL, 872 .sv_table = linux_sysent, 873 .sv_transtrap = linux_translate_traps, 874 .sv_fixup = linux_fixup_elf, 875 .sv_sendsig = linux_sendsig, 876 .sv_sigcode = &_binary_linux_vdso_so_o_start, 877 .sv_szsigcode = &linux_szsigcode, 878 .sv_name = "Linux ELF32", 879 .sv_coredump = elf32_coredump, 880 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 881 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 882 .sv_elf_core_prepare_notes = elf32_prepare_notes, 883 .sv_imgact_try = linux_exec_imgact_try, 884 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 885 .sv_minuser = VM_MIN_ADDRESS, 886 .sv_maxuser = VM_MAXUSER_ADDRESS, 887 .sv_usrstack = LINUX_USRSTACK, 888 .sv_psstrings = LINUX_PS_STRINGS, 889 .sv_psstringssz = sizeof(struct ps_strings), 890 .sv_stackprot = VM_PROT_ALL, 891 .sv_copyout_auxargs = linux_copyout_auxargs, 892 .sv_copyout_strings = linux_copyout_strings, 893 .sv_setregs = linux_exec_setregs, 894 .sv_fixlimit = NULL, 895 .sv_maxssiz = NULL, 896 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP | 897 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 898 .sv_set_syscall_retval = linux_set_syscall_retval, 899 .sv_fetch_syscall_args = linux_fetch_syscall_args, 900 .sv_syscallnames = NULL, 901 .sv_shared_page_base = LINUX_SHAREDPAGE, 902 .sv_shared_page_len = PAGE_SIZE, 903 .sv_schedtail = linux_schedtail, 904 .sv_thread_detach = linux_thread_detach, 905 .sv_trap = NULL, 906 .sv_onexec = linux_on_exec_vmspace, 907 .sv_onexit = linux_on_exit, 908 .sv_ontdexit = linux_thread_dtor, 909 .sv_setid_allowed = &linux_setid_allowed_query, 910 .sv_set_fork_retval = linux_set_fork_retval, 911 }; 912 913 static int 914 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 915 { 916 int error = 0; 917 918 if (SV_PROC_FLAG(p, SV_SHP) != 0) 919 error = linux_map_vdso(p, linux_vdso_obj, 920 linux_vdso_base, LINUX_VDSOPAGE_SIZE, imgp); 921 if (error == 0) 922 linux_on_exec(p, imgp); 923 return (error); 924 } 925 926 /* 927 * linux_vdso_install() and linux_exec_sysvec_init() must be called 928 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 929 */ 930 static void 931 linux_exec_sysvec_init(void *param) 932 { 933 l_uintptr_t *ktimekeep_base, *ktsc_selector; 934 struct sysentvec *sv; 935 ptrdiff_t tkoff; 936 937 sv = param; 938 /* Fill timekeep_base */ 939 exec_sysvec_init(sv); 940 941 tkoff = kern_timekeep_base - linux_vdso_base; 942 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 943 *ktimekeep_base = sv->sv_timekeep_base; 944 945 tkoff = kern_tsc_selector - linux_vdso_base; 946 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 947 *ktsc_selector = linux_vdso_tsc_selector_idx(); 948 if (bootverbose) 949 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 950 } 951 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 952 linux_exec_sysvec_init, &elf_linux_sysvec); 953 954 static void 955 linux_vdso_install(const void *param) 956 { 957 char *vdso_start = &_binary_linux_vdso_so_o_start; 958 char *vdso_end = &_binary_linux_vdso_so_o_end; 959 960 linux_szsigcode = vdso_end - vdso_start; 961 MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE); 962 963 linux_vdso_base = LINUX_VDSOPAGE; 964 965 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 966 967 linux_vdso_obj = __elfN(linux_shared_page_init) 968 (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 969 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 970 971 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 972 } 973 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 974 linux_vdso_install, NULL); 975 976 static void 977 linux_vdso_deinstall(const void *param) 978 { 979 980 __elfN(linux_shared_page_fini)(linux_vdso_obj, 981 linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 982 } 983 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 984 linux_vdso_deinstall, NULL); 985 986 static void 987 linux_vdso_reloc(char *mapping, Elf_Addr offset) 988 { 989 const Elf_Shdr *shdr; 990 const Elf_Rel *rel; 991 const Elf_Ehdr *ehdr; 992 Elf_Addr *where; 993 Elf_Size rtype, symidx; 994 Elf_Addr addr, addend; 995 int i, relcnt; 996 997 MPASS(offset != 0); 998 999 relcnt = 0; 1000 ehdr = (const Elf_Ehdr *)mapping; 1001 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 1002 for (i = 0; i < ehdr->e_shnum; i++) 1003 { 1004 switch (shdr[i].sh_type) { 1005 case SHT_REL: 1006 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 1007 relcnt = shdr[i].sh_size / sizeof(*rel); 1008 break; 1009 case SHT_RELA: 1010 printf("Linux i386 vDSO: unexpected Rela section\n"); 1011 break; 1012 } 1013 } 1014 1015 for (i = 0; i < relcnt; i++, rel++) { 1016 where = (Elf_Addr *)(mapping + rel->r_offset); 1017 addend = *where; 1018 rtype = ELF_R_TYPE(rel->r_info); 1019 symidx = ELF_R_SYM(rel->r_info); 1020 1021 switch (rtype) { 1022 case R_386_NONE: /* none */ 1023 break; 1024 1025 case R_386_RELATIVE: /* B + A */ 1026 addr = (Elf_Addr)PTROUT(offset + addend); 1027 if (*where != addr) 1028 *where = addr; 1029 break; 1030 1031 case R_386_IRELATIVE: 1032 printf("Linux i386 vDSO: unexpected ifunc relocation, " 1033 "symbol index %d\n", symidx); 1034 break; 1035 default: 1036 printf("Linux i386 vDSO: unexpected relocation type %d, " 1037 "symbol index %d\n", rtype, symidx); 1038 } 1039 } 1040 } 1041 1042 static char GNU_ABI_VENDOR[] = "GNU"; 1043 static int GNULINUX_ABI_DESC = 0; 1044 1045 static bool 1046 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1047 { 1048 const Elf32_Word *desc; 1049 uintptr_t p; 1050 1051 p = (uintptr_t)(note + 1); 1052 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1053 1054 desc = (const Elf32_Word *)p; 1055 if (desc[0] != GNULINUX_ABI_DESC) 1056 return (false); 1057 1058 /* 1059 * For Linux we encode osrel using the Linux convention of 1060 * (version << 16) | (major << 8) | (minor) 1061 * See macro in linux_mib.h 1062 */ 1063 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1064 1065 return (true); 1066 } 1067 1068 static Elf_Brandnote linux_brandnote = { 1069 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1070 .hdr.n_descsz = 16, /* XXX at least 16 */ 1071 .hdr.n_type = 1, 1072 .vendor = GNU_ABI_VENDOR, 1073 .flags = BN_TRANSLATE_OSREL, 1074 .trans_osrel = linux_trans_osrel 1075 }; 1076 1077 static Elf32_Brandinfo linux_brand = { 1078 .brand = ELFOSABI_LINUX, 1079 .machine = EM_386, 1080 .compat_3_brand = "Linux", 1081 .emul_path = linux_emul_path, 1082 .interp_path = "/lib/ld-linux.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 1089 static Elf32_Brandinfo linux_glibc2brand = { 1090 .brand = ELFOSABI_LINUX, 1091 .machine = EM_386, 1092 .compat_3_brand = "Linux", 1093 .emul_path = linux_emul_path, 1094 .interp_path = "/lib/ld-linux.so.2", 1095 .sysvec = &elf_linux_sysvec, 1096 .interp_newpath = NULL, 1097 .brand_note = &linux_brandnote, 1098 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1099 }; 1100 1101 static Elf32_Brandinfo linux_muslbrand = { 1102 .brand = ELFOSABI_LINUX, 1103 .machine = EM_386, 1104 .compat_3_brand = "Linux", 1105 .emul_path = linux_emul_path, 1106 .interp_path = "/lib/ld-musl-i386.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 LINUX_BI_FUTEX_REQUEUE 1112 }; 1113 1114 Elf32_Brandinfo *linux_brandlist[] = { 1115 &linux_brand, 1116 &linux_glibc2brand, 1117 &linux_muslbrand, 1118 NULL 1119 }; 1120 1121 static int 1122 linux_elf_modevent(module_t mod, int type, void *data) 1123 { 1124 Elf32_Brandinfo **brandinfo; 1125 int error; 1126 struct linux_ioctl_handler **lihp; 1127 1128 error = 0; 1129 1130 switch(type) { 1131 case MOD_LOAD: 1132 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1133 ++brandinfo) 1134 if (elf32_insert_brand_entry(*brandinfo) < 0) 1135 error = EINVAL; 1136 if (error == 0) { 1137 SET_FOREACH(lihp, linux_ioctl_handler_set) 1138 linux_ioctl_register_handler(*lihp); 1139 linux_dev_shm_create(); 1140 linux_osd_jail_register(); 1141 stclohz = (stathz ? stathz : hz); 1142 if (bootverbose) 1143 printf("Linux ELF exec handler installed\n"); 1144 } else 1145 printf("cannot insert Linux ELF brand handler\n"); 1146 break; 1147 case MOD_UNLOAD: 1148 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1149 ++brandinfo) 1150 if (elf32_brand_inuse(*brandinfo)) 1151 error = EBUSY; 1152 if (error == 0) { 1153 for (brandinfo = &linux_brandlist[0]; 1154 *brandinfo != NULL; ++brandinfo) 1155 if (elf32_remove_brand_entry(*brandinfo) < 0) 1156 error = EINVAL; 1157 } 1158 if (error == 0) { 1159 SET_FOREACH(lihp, linux_ioctl_handler_set) 1160 linux_ioctl_unregister_handler(*lihp); 1161 linux_dev_shm_destroy(); 1162 linux_osd_jail_deregister(); 1163 if (bootverbose) 1164 printf("Linux ELF exec handler removed\n"); 1165 } else 1166 printf("Could not deinstall ELF interpreter entry\n"); 1167 break; 1168 default: 1169 return (EOPNOTSUPP); 1170 } 1171 return (error); 1172 } 1173 1174 static moduledata_t linux_elf_mod = { 1175 "linuxelf", 1176 linux_elf_modevent, 1177 0 1178 }; 1179 1180 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1181 FEATURE(linux, "Linux 32bit support"); 1182