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 #include <x86/linux/linux_x86_sigframe.h> 78 79 MODULE_VERSION(linux, 1); 80 81 #define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2 82 #define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - LINUX_VDSOPAGE_SIZE) 83 #define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE) 84 /* 85 * PAGE_SIZE - the size 86 * of the native SHAREDPAGE 87 */ 88 #define LINUX_USRSTACK LINUX_SHAREDPAGE 89 #define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings)) 90 91 static int linux_szsigcode; 92 static vm_object_t linux_vdso_obj; 93 static char *linux_vdso_mapping; 94 extern char _binary_linux_vdso_so_o_start; 95 extern char _binary_linux_vdso_so_o_end; 96 static vm_offset_t linux_vdso_base; 97 98 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 99 100 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 101 102 static int linux_fixup(uintptr_t *stack_base, 103 struct image_params *iparams); 104 static int linux_fixup_elf(uintptr_t *stack_base, 105 struct image_params *iparams); 106 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 107 static void linux_exec_setregs(struct thread *td, 108 struct image_params *imgp, uintptr_t stack); 109 static void linux_exec_sysvec_init(void *param); 110 static int linux_on_exec_vmspace(struct proc *p, 111 struct image_params *imgp); 112 static int linux_copyout_strings(struct image_params *imgp, 113 uintptr_t *stack_base); 114 static void linux_set_fork_retval(struct thread *td); 115 static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel); 116 static void linux_vdso_install(const void *param); 117 static void linux_vdso_deinstall(const void *param); 118 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 119 120 #define LINUX_T_UNKNOWN 255 121 static int _bsd_to_linux_trapcode[] = { 122 LINUX_T_UNKNOWN, /* 0 */ 123 6, /* 1 T_PRIVINFLT */ 124 LINUX_T_UNKNOWN, /* 2 */ 125 3, /* 3 T_BPTFLT */ 126 LINUX_T_UNKNOWN, /* 4 */ 127 LINUX_T_UNKNOWN, /* 5 */ 128 16, /* 6 T_ARITHTRAP */ 129 254, /* 7 T_ASTFLT */ 130 LINUX_T_UNKNOWN, /* 8 */ 131 13, /* 9 T_PROTFLT */ 132 1, /* 10 T_TRCTRAP */ 133 LINUX_T_UNKNOWN, /* 11 */ 134 14, /* 12 T_PAGEFLT */ 135 LINUX_T_UNKNOWN, /* 13 */ 136 17, /* 14 T_ALIGNFLT */ 137 LINUX_T_UNKNOWN, /* 15 */ 138 LINUX_T_UNKNOWN, /* 16 */ 139 LINUX_T_UNKNOWN, /* 17 */ 140 0, /* 18 T_DIVIDE */ 141 2, /* 19 T_NMI */ 142 4, /* 20 T_OFLOW */ 143 5, /* 21 T_BOUND */ 144 7, /* 22 T_DNA */ 145 8, /* 23 T_DOUBLEFLT */ 146 9, /* 24 T_FPOPFLT */ 147 10, /* 25 T_TSSFLT */ 148 11, /* 26 T_SEGNPFLT */ 149 12, /* 27 T_STKFLT */ 150 18, /* 28 T_MCHK */ 151 19, /* 29 T_XMMFLT */ 152 15 /* 30 T_RESERVED */ 153 }; 154 #define bsd_to_linux_trapcode(code) \ 155 ((code)<nitems(_bsd_to_linux_trapcode)? \ 156 _bsd_to_linux_trapcode[(code)]: \ 157 LINUX_T_UNKNOWN) 158 159 LINUX_VDSO_SYM_CHAR(linux_platform); 160 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 161 LINUX_VDSO_SYM_INTPTR(linux_vdso_sigcode); 162 LINUX_VDSO_SYM_INTPTR(linux_vdso_rt_sigcode); 163 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 164 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 165 LINUX_VDSO_SYM_INTPTR(kern_cpu_selector); 166 167 /* 168 * If FreeBSD & Linux have a difference of opinion about what a trap 169 * means, deal with it here. 170 * 171 * MPSAFE 172 */ 173 static int 174 linux_translate_traps(int signal, int trap_code) 175 { 176 if (signal != SIGBUS) 177 return (signal); 178 switch (trap_code) { 179 case T_PROTFLT: 180 case T_TSSFLT: 181 case T_DOUBLEFLT: 182 case T_PAGEFLT: 183 return (SIGSEGV); 184 default: 185 return (signal); 186 } 187 } 188 189 static int 190 linux_fixup(uintptr_t *stack_base, struct image_params *imgp) 191 { 192 register_t *base, *argv, *envp; 193 194 base = (register_t *)*stack_base; 195 argv = base; 196 envp = base + (imgp->args->argc + 1); 197 base--; 198 suword(base, (intptr_t)envp); 199 base--; 200 suword(base, (intptr_t)argv); 201 base--; 202 suword(base, imgp->args->argc); 203 *stack_base = (uintptr_t)base; 204 return (0); 205 } 206 207 static int 208 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 209 { 210 Elf32_Auxargs *args; 211 Elf32_Auxinfo *argarray, *pos; 212 int error, issetugid; 213 214 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 215 args = (Elf32_Auxargs *)imgp->auxargs; 216 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 217 M_WAITOK | M_ZERO); 218 219 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 220 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 221 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 222 223 /* 224 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 225 * as it has appeared in the 2.4.0-rc7 first time. 226 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 227 * glibc falls back to the hard-coded CLK_TCK value when aux entry 228 * is not present. 229 * Also see linux_times() implementation. 230 */ 231 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 232 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 233 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 234 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 235 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 236 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 237 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 238 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 239 AUXARGS_ENTRY(pos, AT_BASE, args->base); 240 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 241 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 242 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 243 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 244 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 245 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 246 AUXARGS_ENTRY_PTR(pos, LINUX_AT_RANDOM, imgp->canary); 247 if (imgp->execpathp != 0) 248 AUXARGS_ENTRY_PTR(pos, LINUX_AT_EXECFN, imgp->execpathp); 249 if (args->execfd != -1) 250 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 251 AUXARGS_ENTRY(pos, AT_NULL, 0); 252 253 free(imgp->auxargs, M_TEMP); 254 imgp->auxargs = NULL; 255 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 256 257 error = copyout(argarray, (void *)base, 258 sizeof(*argarray) * LINUX_AT_COUNT); 259 free(argarray, M_TEMP); 260 return (error); 261 } 262 263 static int 264 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 265 { 266 register_t *base; 267 268 base = (register_t *)*stack_base; 269 base--; 270 if (suword(base, (register_t)imgp->args->argc) == -1) 271 return (EFAULT); 272 *stack_base = (uintptr_t)base; 273 return (0); 274 } 275 276 /* 277 * Copied from kern/kern_exec.c 278 */ 279 static int 280 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 281 { 282 int argc, envc, error; 283 char **vectp; 284 char *stringp; 285 uintptr_t destp, ustringp; 286 struct ps_strings *arginfo; 287 char canary[LINUX_AT_RANDOM_LEN]; 288 size_t execpath_len; 289 struct proc *p; 290 291 p = imgp->proc; 292 arginfo = (struct ps_strings *)PROC_PS_STRINGS(p); 293 destp = (uintptr_t)arginfo; 294 295 if (imgp->execpath != NULL && imgp->auxargs != NULL) { 296 execpath_len = strlen(imgp->execpath) + 1; 297 destp -= execpath_len; 298 destp = rounddown2(destp, sizeof(void *)); 299 imgp->execpathp = (void *)destp; 300 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 301 if (error != 0) 302 return (error); 303 } 304 305 /* Prepare the canary for SSP. */ 306 arc4rand(canary, sizeof(canary), 0); 307 destp -= roundup(sizeof(canary), sizeof(void *)); 308 imgp->canary = (void *)destp; 309 error = copyout(canary, imgp->canary, sizeof(canary)); 310 if (error != 0) 311 return (error); 312 313 /* Allocate room for the argument and environment strings. */ 314 destp -= ARG_MAX - imgp->args->stringspace; 315 destp = rounddown2(destp, sizeof(void *)); 316 ustringp = destp; 317 318 if (imgp->auxargs) { 319 /* 320 * Allocate room on the stack for the ELF auxargs 321 * array. It has LINUX_AT_COUNT entries. 322 */ 323 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 324 destp = rounddown2(destp, sizeof(void *)); 325 } 326 327 vectp = (char **)destp; 328 329 /* 330 * Allocate room for the argv[] and env vectors including the 331 * terminating NULL pointers. 332 */ 333 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 334 335 /* vectp also becomes our initial stack base. */ 336 *stack_base = (uintptr_t)vectp; 337 338 stringp = imgp->args->begin_argv; 339 argc = imgp->args->argc; 340 envc = imgp->args->envc; 341 342 /* Copy out strings - arguments and environment. */ 343 error = copyout(stringp, (void *)ustringp, 344 ARG_MAX - imgp->args->stringspace); 345 if (error != 0) 346 return (error); 347 348 /* Fill in "ps_strings" struct for ps, w, etc. */ 349 if (suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp) != 0 || 350 suword(&arginfo->ps_nargvstr, argc) != 0) 351 return (EFAULT); 352 353 /* Fill in argument portion of vector table. */ 354 for (; argc > 0; --argc) { 355 if (suword(vectp++, ustringp) != 0) 356 return (EFAULT); 357 while (*stringp++ != 0) 358 ustringp++; 359 ustringp++; 360 } 361 362 /* A null vector table pointer separates the argp's from the envp's. */ 363 if (suword(vectp++, 0) != 0) 364 return (EFAULT); 365 366 if (suword(&arginfo->ps_envstr, (long)(intptr_t)vectp) != 0 || 367 suword(&arginfo->ps_nenvstr, envc) != 0) 368 return (EFAULT); 369 370 /* Fill in environment portion of vector table. */ 371 for (; envc > 0; --envc) { 372 if (suword(vectp++, ustringp) != 0) 373 return (EFAULT); 374 while (*stringp++ != 0) 375 ustringp++; 376 ustringp++; 377 } 378 379 /* The end of the vector table is a null pointer. */ 380 if (suword(vectp, 0) != 0) 381 return (EFAULT); 382 383 if (imgp->auxargs) { 384 vectp++; 385 error = imgp->sysent->sv_copyout_auxargs(imgp, 386 (uintptr_t)vectp); 387 if (error != 0) 388 return (error); 389 } 390 391 return (0); 392 } 393 394 static void 395 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 396 { 397 struct thread *td = curthread; 398 struct proc *p = td->td_proc; 399 struct sigacts *psp; 400 struct trapframe *regs; 401 struct l_rt_sigframe *fp, frame; 402 int sig, code; 403 int oonstack; 404 405 sig = ksi->ksi_signo; 406 code = ksi->ksi_code; 407 PROC_LOCK_ASSERT(p, MA_OWNED); 408 psp = p->p_sigacts; 409 mtx_assert(&psp->ps_mtx, MA_OWNED); 410 regs = td->td_frame; 411 oonstack = sigonstack(regs->tf_esp); 412 413 /* Allocate space for the signal handler context. */ 414 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 415 SIGISMEMBER(psp->ps_sigonstack, sig)) { 416 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 417 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 418 } else 419 fp = (struct l_rt_sigframe *)regs->tf_esp - 1; 420 mtx_unlock(&psp->ps_mtx); 421 422 /* Build the argument list for the signal handler. */ 423 sig = bsd_to_linux_signal(sig); 424 425 bzero(&frame, sizeof(frame)); 426 427 frame.sf_sig = sig; 428 frame.sf_siginfo = PTROUT(&fp->sf_si); 429 frame.sf_ucontext = PTROUT(&fp->sf_uc); 430 431 /* Fill in POSIX parts. */ 432 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 433 434 /* Build the signal context to be used by sigreturn. */ 435 frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 436 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 437 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 438 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 439 PROC_UNLOCK(p); 440 441 bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask); 442 443 frame.sf_uc.uc_mcontext.sc_mask = frame.sf_uc.uc_sigmask.__mask; 444 frame.sf_uc.uc_mcontext.sc_gs = rgs(); 445 frame.sf_uc.uc_mcontext.sc_fs = regs->tf_fs; 446 frame.sf_uc.uc_mcontext.sc_es = regs->tf_es; 447 frame.sf_uc.uc_mcontext.sc_ds = regs->tf_ds; 448 frame.sf_uc.uc_mcontext.sc_edi = regs->tf_edi; 449 frame.sf_uc.uc_mcontext.sc_esi = regs->tf_esi; 450 frame.sf_uc.uc_mcontext.sc_ebp = regs->tf_ebp; 451 frame.sf_uc.uc_mcontext.sc_ebx = regs->tf_ebx; 452 frame.sf_uc.uc_mcontext.sc_esp = regs->tf_esp; 453 frame.sf_uc.uc_mcontext.sc_edx = regs->tf_edx; 454 frame.sf_uc.uc_mcontext.sc_ecx = regs->tf_ecx; 455 frame.sf_uc.uc_mcontext.sc_eax = regs->tf_eax; 456 frame.sf_uc.uc_mcontext.sc_eip = regs->tf_eip; 457 frame.sf_uc.uc_mcontext.sc_cs = regs->tf_cs; 458 frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_eflags; 459 frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_esp; 460 frame.sf_uc.uc_mcontext.sc_ss = regs->tf_ss; 461 frame.sf_uc.uc_mcontext.sc_err = regs->tf_err; 462 frame.sf_uc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr; 463 frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 464 465 if (copyout(&frame, fp, sizeof(frame)) != 0) { 466 /* 467 * Process has trashed its stack; give it an illegal 468 * instruction to halt it in its tracks. 469 */ 470 PROC_LOCK(p); 471 sigexit(td, SIGILL); 472 } 473 474 /* Build context to run handler in. */ 475 regs->tf_esp = PTROUT(fp); 476 regs->tf_eip = linux_vdso_rt_sigcode; 477 regs->tf_edi = PTROUT(catcher); 478 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 479 regs->tf_cs = _ucodesel; 480 regs->tf_ds = _udatasel; 481 regs->tf_es = _udatasel; 482 regs->tf_fs = _udatasel; 483 regs->tf_ss = _udatasel; 484 PROC_LOCK(p); 485 mtx_lock(&psp->ps_mtx); 486 } 487 488 /* 489 * Send an interrupt to process. 490 * 491 * Stack is set up to allow sigcode stored 492 * in u. to call routine, followed by kcall 493 * to sigreturn routine below. After sigreturn 494 * resets the signal mask, the stack, and the 495 * frame pointer, it returns to the user 496 * specified pc, psl. 497 */ 498 static void 499 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 500 { 501 struct thread *td = curthread; 502 struct proc *p = td->td_proc; 503 struct sigacts *psp; 504 struct trapframe *regs; 505 struct l_sigframe *fp, frame; 506 l_sigset_t lmask; 507 int sig; 508 int oonstack; 509 510 PROC_LOCK_ASSERT(p, MA_OWNED); 511 psp = p->p_sigacts; 512 sig = ksi->ksi_signo; 513 mtx_assert(&psp->ps_mtx, MA_OWNED); 514 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 515 /* Signal handler installed with SA_SIGINFO. */ 516 linux_rt_sendsig(catcher, ksi, mask); 517 return; 518 } 519 regs = td->td_frame; 520 oonstack = sigonstack(regs->tf_esp); 521 522 /* Allocate space for the signal handler context. */ 523 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 524 SIGISMEMBER(psp->ps_sigonstack, sig)) { 525 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 526 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 527 } else 528 fp = (struct l_sigframe *)regs->tf_esp - 1; 529 mtx_unlock(&psp->ps_mtx); 530 PROC_UNLOCK(p); 531 532 /* Build the argument list for the signal handler. */ 533 sig = bsd_to_linux_signal(sig); 534 535 bzero(&frame, sizeof(frame)); 536 537 frame.sf_sig = sig; 538 539 bsd_to_linux_sigset(mask, &lmask); 540 541 /* Build the signal context to be used by sigreturn. */ 542 frame.sf_sc.sc_mask = lmask.__mask; 543 frame.sf_sc.sc_gs = rgs(); 544 frame.sf_sc.sc_fs = regs->tf_fs; 545 frame.sf_sc.sc_es = regs->tf_es; 546 frame.sf_sc.sc_ds = regs->tf_ds; 547 frame.sf_sc.sc_edi = regs->tf_edi; 548 frame.sf_sc.sc_esi = regs->tf_esi; 549 frame.sf_sc.sc_ebp = regs->tf_ebp; 550 frame.sf_sc.sc_ebx = regs->tf_ebx; 551 frame.sf_sc.sc_esp = regs->tf_esp; 552 frame.sf_sc.sc_edx = regs->tf_edx; 553 frame.sf_sc.sc_ecx = regs->tf_ecx; 554 frame.sf_sc.sc_eax = regs->tf_eax; 555 frame.sf_sc.sc_eip = regs->tf_eip; 556 frame.sf_sc.sc_cs = regs->tf_cs; 557 frame.sf_sc.sc_eflags = regs->tf_eflags; 558 frame.sf_sc.sc_esp_at_signal = regs->tf_esp; 559 frame.sf_sc.sc_ss = regs->tf_ss; 560 frame.sf_sc.sc_err = regs->tf_err; 561 frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr; 562 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno); 563 564 frame.sf_extramask[0] = lmask.__mask; 565 566 if (copyout(&frame, fp, sizeof(frame)) != 0) { 567 /* 568 * Process has trashed its stack; give it an illegal 569 * instruction to halt it in its tracks. 570 */ 571 PROC_LOCK(p); 572 sigexit(td, SIGILL); 573 } 574 575 /* Build context to run handler in. */ 576 regs->tf_esp = PTROUT(fp); 577 regs->tf_eip = linux_vdso_sigcode; 578 regs->tf_edi = PTROUT(catcher); 579 regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D); 580 regs->tf_cs = _ucodesel; 581 regs->tf_ds = _udatasel; 582 regs->tf_es = _udatasel; 583 regs->tf_fs = _udatasel; 584 regs->tf_ss = _udatasel; 585 PROC_LOCK(p); 586 mtx_lock(&psp->ps_mtx); 587 } 588 589 /* 590 * System call to cleanup state after a signal 591 * has been taken. Reset signal mask and 592 * stack state from context left by sendsig (above). 593 * Return to previous pc and psl as specified by 594 * context left by sendsig. Check carefully to 595 * make sure that the user has not modified the 596 * psl to gain improper privileges or to cause 597 * a machine fault. 598 */ 599 int 600 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 601 { 602 struct l_sigframe frame; 603 struct trapframe *regs; 604 l_sigset_t lmask; 605 sigset_t bmask; 606 int eflags; 607 ksiginfo_t ksi; 608 609 regs = td->td_frame; 610 611 /* 612 * The trampoline code hands us the sigframe. 613 * It is unsafe to keep track of it ourselves, in the event that a 614 * program jumps out of a signal handler. 615 */ 616 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 617 return (EFAULT); 618 619 /* Check for security violations. */ 620 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 621 eflags = frame.sf_sc.sc_eflags; 622 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 623 return (EINVAL); 624 625 /* 626 * Don't allow users to load a valid privileged %cs. Let the 627 * hardware check for invalid selectors, excess privilege in 628 * other selectors, invalid %eip's and invalid %esp's. 629 */ 630 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 631 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 632 ksiginfo_init_trap(&ksi); 633 ksi.ksi_signo = SIGBUS; 634 ksi.ksi_code = BUS_OBJERR; 635 ksi.ksi_trapno = T_PROTFLT; 636 ksi.ksi_addr = (void *)regs->tf_eip; 637 trapsignal(td, &ksi); 638 return (EINVAL); 639 } 640 641 lmask.__mask = frame.sf_sc.sc_mask; 642 linux_to_bsd_sigset(&lmask, &bmask); 643 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 644 645 /* Restore signal context. */ 646 /* %gs was restored by the trampoline. */ 647 regs->tf_fs = frame.sf_sc.sc_fs; 648 regs->tf_es = frame.sf_sc.sc_es; 649 regs->tf_ds = frame.sf_sc.sc_ds; 650 regs->tf_edi = frame.sf_sc.sc_edi; 651 regs->tf_esi = frame.sf_sc.sc_esi; 652 regs->tf_ebp = frame.sf_sc.sc_ebp; 653 regs->tf_ebx = frame.sf_sc.sc_ebx; 654 regs->tf_edx = frame.sf_sc.sc_edx; 655 regs->tf_ecx = frame.sf_sc.sc_ecx; 656 regs->tf_eax = frame.sf_sc.sc_eax; 657 regs->tf_eip = frame.sf_sc.sc_eip; 658 regs->tf_cs = frame.sf_sc.sc_cs; 659 regs->tf_eflags = eflags; 660 regs->tf_esp = frame.sf_sc.sc_esp_at_signal; 661 regs->tf_ss = frame.sf_sc.sc_ss; 662 663 return (EJUSTRETURN); 664 } 665 666 /* 667 * System call to cleanup state after a signal 668 * has been taken. Reset signal mask and 669 * stack state from context left by rt_sendsig (above). 670 * Return to previous pc and psl as specified by 671 * context left by sendsig. Check carefully to 672 * make sure that the user has not modified the 673 * psl to gain improper privileges or to cause 674 * a machine fault. 675 */ 676 int 677 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 678 { 679 struct l_ucontext uc; 680 struct l_sigcontext *context; 681 sigset_t bmask; 682 l_stack_t *lss; 683 stack_t ss; 684 struct trapframe *regs; 685 int eflags; 686 ksiginfo_t ksi; 687 688 regs = td->td_frame; 689 690 /* 691 * The trampoline code hands us the ucontext. 692 * It is unsafe to keep track of it ourselves, in the event that a 693 * program jumps out of a signal handler. 694 */ 695 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 696 return (EFAULT); 697 698 context = &uc.uc_mcontext; 699 700 /* Check for security violations. */ 701 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 702 eflags = context->sc_eflags; 703 if (!EFLAGS_SECURE(eflags, regs->tf_eflags)) 704 return (EINVAL); 705 706 /* 707 * Don't allow users to load a valid privileged %cs. Let the 708 * hardware check for invalid selectors, excess privilege in 709 * other selectors, invalid %eip's and invalid %esp's. 710 */ 711 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 712 if (!CS_SECURE(context->sc_cs)) { 713 ksiginfo_init_trap(&ksi); 714 ksi.ksi_signo = SIGBUS; 715 ksi.ksi_code = BUS_OBJERR; 716 ksi.ksi_trapno = T_PROTFLT; 717 ksi.ksi_addr = (void *)regs->tf_eip; 718 trapsignal(td, &ksi); 719 return (EINVAL); 720 } 721 722 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 723 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 724 725 /* Restore signal context. */ 726 /* %gs was restored by the trampoline. */ 727 regs->tf_fs = context->sc_fs; 728 regs->tf_es = context->sc_es; 729 regs->tf_ds = context->sc_ds; 730 regs->tf_edi = context->sc_edi; 731 regs->tf_esi = context->sc_esi; 732 regs->tf_ebp = context->sc_ebp; 733 regs->tf_ebx = context->sc_ebx; 734 regs->tf_edx = context->sc_edx; 735 regs->tf_ecx = context->sc_ecx; 736 regs->tf_eax = context->sc_eax; 737 regs->tf_eip = context->sc_eip; 738 regs->tf_cs = context->sc_cs; 739 regs->tf_eflags = eflags; 740 regs->tf_esp = context->sc_esp_at_signal; 741 regs->tf_ss = context->sc_ss; 742 743 /* Call sigaltstack & ignore results. */ 744 lss = &uc.uc_stack; 745 ss.ss_sp = PTRIN(lss->ss_sp); 746 ss.ss_size = lss->ss_size; 747 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 748 749 (void)kern_sigaltstack(td, &ss, NULL); 750 751 return (EJUSTRETURN); 752 } 753 754 static int 755 linux_fetch_syscall_args(struct thread *td) 756 { 757 struct proc *p; 758 struct trapframe *frame; 759 struct syscall_args *sa; 760 761 p = td->td_proc; 762 frame = td->td_frame; 763 sa = &td->td_sa; 764 765 sa->code = frame->tf_eax; 766 sa->original_code = sa->code; 767 sa->args[0] = frame->tf_ebx; 768 sa->args[1] = frame->tf_ecx; 769 sa->args[2] = frame->tf_edx; 770 sa->args[3] = frame->tf_esi; 771 sa->args[4] = frame->tf_edi; 772 sa->args[5] = frame->tf_ebp; /* Unconfirmed */ 773 774 if (sa->code >= p->p_sysent->sv_size) 775 /* nosys */ 776 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 777 else 778 sa->callp = &p->p_sysent->sv_table[sa->code]; 779 780 td->td_retval[0] = 0; 781 td->td_retval[1] = frame->tf_edx; 782 783 return (0); 784 } 785 786 static void 787 linux_set_syscall_retval(struct thread *td, int error) 788 { 789 struct trapframe *frame = td->td_frame; 790 791 cpu_set_syscall_retval(td, error); 792 793 if (__predict_false(error != 0)) { 794 if (error != ERESTART && error != EJUSTRETURN) 795 frame->tf_eax = bsd_to_linux_errno(error); 796 } 797 } 798 799 static void 800 linux_set_fork_retval(struct thread *td) 801 { 802 struct trapframe *frame = td->td_frame; 803 804 frame->tf_eax = 0; 805 } 806 807 /* 808 * exec_setregs may initialize some registers differently than Linux 809 * does, thus potentially confusing Linux binaries. If necessary, we 810 * override the exec_setregs default(s) here. 811 */ 812 static void 813 linux_exec_setregs(struct thread *td, struct image_params *imgp, 814 uintptr_t stack) 815 { 816 struct pcb *pcb = td->td_pcb; 817 818 exec_setregs(td, imgp, stack); 819 820 /* Linux sets %gs to 0, we default to _udatasel. */ 821 pcb->pcb_gs = 0; 822 load_gs(0); 823 824 pcb->pcb_initial_npxcw = __LINUX_NPXCW__; 825 } 826 827 struct sysentvec linux_sysvec = { 828 .sv_size = LINUX_SYS_MAXSYSCALL, 829 .sv_table = linux_sysent, 830 .sv_transtrap = linux_translate_traps, 831 .sv_fixup = linux_fixup, 832 .sv_sendsig = linux_sendsig, 833 .sv_sigcode = &_binary_linux_vdso_so_o_start, 834 .sv_szsigcode = &linux_szsigcode, 835 .sv_name = "Linux a.out", 836 .sv_coredump = NULL, 837 .sv_imgact_try = linux_exec_imgact_try, 838 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 839 .sv_minuser = VM_MIN_ADDRESS, 840 .sv_maxuser = VM_MAXUSER_ADDRESS, 841 .sv_usrstack = LINUX_USRSTACK, 842 .sv_psstrings = PS_STRINGS, 843 .sv_psstringssz = sizeof(struct ps_strings), 844 .sv_stackprot = VM_PROT_ALL, 845 .sv_copyout_strings = exec_copyout_strings, 846 .sv_setregs = linux_exec_setregs, 847 .sv_fixlimit = NULL, 848 .sv_maxssiz = NULL, 849 .sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 | 850 SV_SIG_DISCIGN | SV_SIG_WAITNDQ, 851 .sv_set_syscall_retval = linux_set_syscall_retval, 852 .sv_fetch_syscall_args = linux_fetch_syscall_args, 853 .sv_syscallnames = NULL, 854 .sv_schedtail = linux_schedtail, 855 .sv_thread_detach = linux_thread_detach, 856 .sv_trap = NULL, 857 .sv_onexec = linux_on_exec_vmspace, 858 .sv_onexit = linux_on_exit, 859 .sv_ontdexit = linux_thread_dtor, 860 .sv_setid_allowed = &linux_setid_allowed_query, 861 .sv_set_fork_retval = linux_set_fork_retval, 862 }; 863 INIT_SYSENTVEC(aout_sysvec, &linux_sysvec); 864 865 struct sysentvec elf_linux_sysvec = { 866 .sv_size = LINUX_SYS_MAXSYSCALL, 867 .sv_table = linux_sysent, 868 .sv_transtrap = linux_translate_traps, 869 .sv_fixup = linux_fixup_elf, 870 .sv_sendsig = linux_sendsig, 871 .sv_sigcode = &_binary_linux_vdso_so_o_start, 872 .sv_szsigcode = &linux_szsigcode, 873 .sv_name = "Linux ELF32", 874 .sv_coredump = elf32_coredump, 875 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 876 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 877 .sv_elf_core_prepare_notes = elf32_prepare_notes, 878 .sv_imgact_try = linux_exec_imgact_try, 879 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 880 .sv_minuser = VM_MIN_ADDRESS, 881 .sv_maxuser = VM_MAXUSER_ADDRESS, 882 .sv_usrstack = LINUX_USRSTACK, 883 .sv_psstrings = LINUX_PS_STRINGS, 884 .sv_psstringssz = sizeof(struct ps_strings), 885 .sv_stackprot = VM_PROT_ALL, 886 .sv_copyout_auxargs = linux_copyout_auxargs, 887 .sv_copyout_strings = linux_copyout_strings, 888 .sv_setregs = linux_exec_setregs, 889 .sv_fixlimit = NULL, 890 .sv_maxssiz = NULL, 891 .sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP | 892 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 893 .sv_set_syscall_retval = linux_set_syscall_retval, 894 .sv_fetch_syscall_args = linux_fetch_syscall_args, 895 .sv_syscallnames = NULL, 896 .sv_shared_page_base = LINUX_SHAREDPAGE, 897 .sv_shared_page_len = PAGE_SIZE, 898 .sv_schedtail = linux_schedtail, 899 .sv_thread_detach = linux_thread_detach, 900 .sv_trap = NULL, 901 .sv_onexec = linux_on_exec_vmspace, 902 .sv_onexit = linux_on_exit, 903 .sv_ontdexit = linux_thread_dtor, 904 .sv_setid_allowed = &linux_setid_allowed_query, 905 .sv_set_fork_retval = linux_set_fork_retval, 906 }; 907 908 static int 909 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 910 { 911 int error = 0; 912 913 if (SV_PROC_FLAG(p, SV_SHP) != 0) 914 error = linux_map_vdso(p, linux_vdso_obj, 915 linux_vdso_base, LINUX_VDSOPAGE_SIZE, imgp); 916 if (error == 0) 917 linux_on_exec(p, imgp); 918 return (error); 919 } 920 921 /* 922 * linux_vdso_install() and linux_exec_sysvec_init() must be called 923 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 924 */ 925 static void 926 linux_exec_sysvec_init(void *param) 927 { 928 l_uintptr_t *ktimekeep_base, *ktsc_selector; 929 struct sysentvec *sv; 930 ptrdiff_t tkoff; 931 932 sv = param; 933 /* Fill timekeep_base */ 934 exec_sysvec_init(sv); 935 936 tkoff = kern_timekeep_base - linux_vdso_base; 937 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 938 *ktimekeep_base = sv->sv_timekeep_base; 939 940 tkoff = kern_tsc_selector - linux_vdso_base; 941 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 942 *ktsc_selector = linux_vdso_tsc_selector_idx(); 943 if (bootverbose) 944 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 945 946 tkoff = kern_cpu_selector - linux_vdso_base; 947 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 948 *ktsc_selector = linux_vdso_cpu_selector_idx(); 949 if (bootverbose) 950 printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector); 951 } 952 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 953 linux_exec_sysvec_init, &elf_linux_sysvec); 954 955 static void 956 linux_vdso_install(const void *param) 957 { 958 char *vdso_start = &_binary_linux_vdso_so_o_start; 959 char *vdso_end = &_binary_linux_vdso_so_o_end; 960 961 linux_szsigcode = vdso_end - vdso_start; 962 MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE); 963 964 linux_vdso_base = LINUX_VDSOPAGE; 965 966 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 967 968 linux_vdso_obj = __elfN(linux_shared_page_init) 969 (&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 970 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 971 972 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 973 } 974 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 975 linux_vdso_install, NULL); 976 977 static void 978 linux_vdso_deinstall(const void *param) 979 { 980 981 __elfN(linux_shared_page_fini)(linux_vdso_obj, 982 linux_vdso_mapping, LINUX_VDSOPAGE_SIZE); 983 } 984 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 985 linux_vdso_deinstall, NULL); 986 987 static void 988 linux_vdso_reloc(char *mapping, Elf_Addr offset) 989 { 990 const Elf_Shdr *shdr; 991 const Elf_Rel *rel; 992 const Elf_Ehdr *ehdr; 993 Elf_Addr *where; 994 Elf_Size rtype, symidx; 995 Elf_Addr addr, addend; 996 int i, relcnt; 997 998 MPASS(offset != 0); 999 1000 relcnt = 0; 1001 ehdr = (const Elf_Ehdr *)mapping; 1002 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 1003 for (i = 0; i < ehdr->e_shnum; i++) 1004 { 1005 switch (shdr[i].sh_type) { 1006 case SHT_REL: 1007 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 1008 relcnt = shdr[i].sh_size / sizeof(*rel); 1009 break; 1010 case SHT_RELA: 1011 printf("Linux i386 vDSO: unexpected Rela section\n"); 1012 break; 1013 } 1014 } 1015 1016 for (i = 0; i < relcnt; i++, rel++) { 1017 where = (Elf_Addr *)(mapping + rel->r_offset); 1018 addend = *where; 1019 rtype = ELF_R_TYPE(rel->r_info); 1020 symidx = ELF_R_SYM(rel->r_info); 1021 1022 switch (rtype) { 1023 case R_386_NONE: /* none */ 1024 break; 1025 1026 case R_386_RELATIVE: /* B + A */ 1027 addr = (Elf_Addr)PTROUT(offset + addend); 1028 if (*where != addr) 1029 *where = addr; 1030 break; 1031 1032 case R_386_IRELATIVE: 1033 printf("Linux i386 vDSO: unexpected ifunc relocation, " 1034 "symbol index %d\n", symidx); 1035 break; 1036 default: 1037 printf("Linux i386 vDSO: unexpected relocation type %d, " 1038 "symbol index %d\n", rtype, symidx); 1039 } 1040 } 1041 } 1042 1043 static char GNU_ABI_VENDOR[] = "GNU"; 1044 static int GNULINUX_ABI_DESC = 0; 1045 1046 static bool 1047 linux_trans_osrel(const Elf_Note *note, int32_t *osrel) 1048 { 1049 const Elf32_Word *desc; 1050 uintptr_t p; 1051 1052 p = (uintptr_t)(note + 1); 1053 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1054 1055 desc = (const Elf32_Word *)p; 1056 if (desc[0] != GNULINUX_ABI_DESC) 1057 return (false); 1058 1059 /* 1060 * For Linux we encode osrel using the Linux convention of 1061 * (version << 16) | (major << 8) | (minor) 1062 * See macro in linux_mib.h 1063 */ 1064 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1065 1066 return (true); 1067 } 1068 1069 static Elf_Brandnote linux_brandnote = { 1070 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1071 .hdr.n_descsz = 16, /* XXX at least 16 */ 1072 .hdr.n_type = 1, 1073 .vendor = GNU_ABI_VENDOR, 1074 .flags = BN_TRANSLATE_OSREL, 1075 .trans_osrel = linux_trans_osrel 1076 }; 1077 1078 static Elf32_Brandinfo linux_brand = { 1079 .brand = ELFOSABI_LINUX, 1080 .machine = EM_386, 1081 .compat_3_brand = "Linux", 1082 .emul_path = linux_emul_path, 1083 .interp_path = "/lib/ld-linux.so.1", 1084 .sysvec = &elf_linux_sysvec, 1085 .interp_newpath = NULL, 1086 .brand_note = &linux_brandnote, 1087 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1088 }; 1089 1090 static Elf32_Brandinfo linux_glibc2brand = { 1091 .brand = ELFOSABI_LINUX, 1092 .machine = EM_386, 1093 .compat_3_brand = "Linux", 1094 .emul_path = linux_emul_path, 1095 .interp_path = "/lib/ld-linux.so.2", 1096 .sysvec = &elf_linux_sysvec, 1097 .interp_newpath = NULL, 1098 .brand_note = &linux_brandnote, 1099 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1100 }; 1101 1102 static Elf32_Brandinfo linux_muslbrand = { 1103 .brand = ELFOSABI_LINUX, 1104 .machine = EM_386, 1105 .compat_3_brand = "Linux", 1106 .emul_path = linux_emul_path, 1107 .interp_path = "/lib/ld-musl-i386.so.1", 1108 .sysvec = &elf_linux_sysvec, 1109 .interp_newpath = NULL, 1110 .brand_note = &linux_brandnote, 1111 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1112 LINUX_BI_FUTEX_REQUEUE 1113 }; 1114 1115 Elf32_Brandinfo *linux_brandlist[] = { 1116 &linux_brand, 1117 &linux_glibc2brand, 1118 &linux_muslbrand, 1119 NULL 1120 }; 1121 1122 static int 1123 linux_elf_modevent(module_t mod, int type, void *data) 1124 { 1125 Elf32_Brandinfo **brandinfo; 1126 int error; 1127 struct linux_ioctl_handler **lihp; 1128 1129 error = 0; 1130 1131 switch(type) { 1132 case MOD_LOAD: 1133 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1134 ++brandinfo) 1135 if (elf32_insert_brand_entry(*brandinfo) < 0) 1136 error = EINVAL; 1137 if (error == 0) { 1138 SET_FOREACH(lihp, linux_ioctl_handler_set) 1139 linux_ioctl_register_handler(*lihp); 1140 linux_dev_shm_create(); 1141 linux_osd_jail_register(); 1142 stclohz = (stathz ? stathz : hz); 1143 if (bootverbose) 1144 printf("Linux ELF exec handler installed\n"); 1145 } else 1146 printf("cannot insert Linux ELF brand handler\n"); 1147 break; 1148 case MOD_UNLOAD: 1149 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1150 ++brandinfo) 1151 if (elf32_brand_inuse(*brandinfo)) 1152 error = EBUSY; 1153 if (error == 0) { 1154 for (brandinfo = &linux_brandlist[0]; 1155 *brandinfo != NULL; ++brandinfo) 1156 if (elf32_remove_brand_entry(*brandinfo) < 0) 1157 error = EINVAL; 1158 } 1159 if (error == 0) { 1160 SET_FOREACH(lihp, linux_ioctl_handler_set) 1161 linux_ioctl_unregister_handler(*lihp); 1162 linux_dev_shm_destroy(); 1163 linux_osd_jail_deregister(); 1164 if (bootverbose) 1165 printf("Linux ELF exec handler removed\n"); 1166 } else 1167 printf("Could not deinstall ELF interpreter entry\n"); 1168 break; 1169 default: 1170 return (EOPNOTSUPP); 1171 } 1172 return (error); 1173 } 1174 1175 static moduledata_t linux_elf_mod = { 1176 "linuxelf", 1177 linux_elf_modevent, 1178 0 1179 }; 1180 1181 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1182 FEATURE(linux, "Linux 32bit support"); 1183