1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2004 Tim J. Robbins 5 * Copyright (c) 2003 Peter Wemm 6 * Copyright (c) 2002 Doug Rabson 7 * Copyright (c) 1998-1999 Andrew Gallatin 8 * Copyright (c) 1994-1996 Søren Schmidt 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer 16 * in this position and unchanged. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 #include "opt_compat.h" 38 39 #ifndef COMPAT_FREEBSD32 40 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 41 #endif 42 43 #define __ELF_WORD_SIZE 32 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/exec.h> 48 #include <sys/fcntl.h> 49 #include <sys/imgact.h> 50 #include <sys/imgact_elf.h> 51 #include <sys/kernel.h> 52 #include <sys/lock.h> 53 #include <sys/malloc.h> 54 #include <sys/module.h> 55 #include <sys/mutex.h> 56 #include <sys/proc.h> 57 #include <sys/resourcevar.h> 58 #include <sys/signalvar.h> 59 #include <sys/syscallsubr.h> 60 #include <sys/sysctl.h> 61 #include <sys/sysent.h> 62 #include <sys/sysproto.h> 63 #include <sys/vnode.h> 64 #include <sys/eventhandler.h> 65 66 #include <vm/vm.h> 67 #include <vm/pmap.h> 68 #include <vm/vm_extern.h> 69 #include <vm/vm_map.h> 70 #include <vm/vm_object.h> 71 #include <vm/vm_page.h> 72 #include <vm/vm_param.h> 73 74 #include <machine/cpu.h> 75 #include <machine/md_var.h> 76 #include <machine/pcb.h> 77 #include <machine/specialreg.h> 78 79 #include <amd64/linux32/linux.h> 80 #include <amd64/linux32/linux32_proto.h> 81 #include <compat/linux/linux_emul.h> 82 #include <compat/linux/linux_futex.h> 83 #include <compat/linux/linux_ioctl.h> 84 #include <compat/linux/linux_mib.h> 85 #include <compat/linux/linux_misc.h> 86 #include <compat/linux/linux_signal.h> 87 #include <compat/linux/linux_util.h> 88 #include <compat/linux/linux_vdso.h> 89 90 MODULE_VERSION(linux, 1); 91 92 #define AUXARGS_ENTRY_32(pos, id, val) \ 93 do { \ 94 suword32(pos++, id); \ 95 suword32(pos++, val); \ 96 } while (0) 97 98 #if BYTE_ORDER == LITTLE_ENDIAN 99 #define SHELLMAGIC 0x2123 /* #! */ 100 #else 101 #define SHELLMAGIC 0x2321 102 #endif 103 104 /* 105 * Allow the sendsig functions to use the ldebug() facility even though they 106 * are not syscalls themselves. Map them to syscall 0. This is slightly less 107 * bogus than using ldebug(sigreturn). 108 */ 109 #define LINUX32_SYS_linux_rt_sendsig 0 110 #define LINUX32_SYS_linux_sendsig 0 111 112 const char *linux_kplatform; 113 static int linux_szsigcode; 114 static vm_object_t linux_shared_page_obj; 115 static char *linux_shared_page_mapping; 116 extern char _binary_linux32_locore_o_start; 117 extern char _binary_linux32_locore_o_end; 118 119 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 120 121 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 122 123 static int linux_fixup_elf(register_t **stack_base, 124 struct image_params *iparams); 125 static register_t *linux_copyout_strings(struct image_params *imgp); 126 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 127 static int linux_exec_imgact_try(struct image_params *iparams); 128 static void linux_exec_setregs(struct thread *td, 129 struct image_params *imgp, u_long stack); 130 static void linux32_fixlimit(struct rlimit *rl, int which); 131 static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 132 static void linux_vdso_install(void *param); 133 static void linux_vdso_deinstall(void *param); 134 135 #define LINUX_T_UNKNOWN 255 136 static int _bsd_to_linux_trapcode[] = { 137 LINUX_T_UNKNOWN, /* 0 */ 138 6, /* 1 T_PRIVINFLT */ 139 LINUX_T_UNKNOWN, /* 2 */ 140 3, /* 3 T_BPTFLT */ 141 LINUX_T_UNKNOWN, /* 4 */ 142 LINUX_T_UNKNOWN, /* 5 */ 143 16, /* 6 T_ARITHTRAP */ 144 254, /* 7 T_ASTFLT */ 145 LINUX_T_UNKNOWN, /* 8 */ 146 13, /* 9 T_PROTFLT */ 147 1, /* 10 T_TRCTRAP */ 148 LINUX_T_UNKNOWN, /* 11 */ 149 14, /* 12 T_PAGEFLT */ 150 LINUX_T_UNKNOWN, /* 13 */ 151 17, /* 14 T_ALIGNFLT */ 152 LINUX_T_UNKNOWN, /* 15 */ 153 LINUX_T_UNKNOWN, /* 16 */ 154 LINUX_T_UNKNOWN, /* 17 */ 155 0, /* 18 T_DIVIDE */ 156 2, /* 19 T_NMI */ 157 4, /* 20 T_OFLOW */ 158 5, /* 21 T_BOUND */ 159 7, /* 22 T_DNA */ 160 8, /* 23 T_DOUBLEFLT */ 161 9, /* 24 T_FPOPFLT */ 162 10, /* 25 T_TSSFLT */ 163 11, /* 26 T_SEGNPFLT */ 164 12, /* 27 T_STKFLT */ 165 18, /* 28 T_MCHK */ 166 19, /* 29 T_XMMFLT */ 167 15 /* 30 T_RESERVED */ 168 }; 169 #define bsd_to_linux_trapcode(code) \ 170 ((code)<nitems(_bsd_to_linux_trapcode)? \ 171 _bsd_to_linux_trapcode[(code)]: \ 172 LINUX_T_UNKNOWN) 173 174 struct linux32_ps_strings { 175 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 176 u_int ps_nargvstr; /* the number of argument strings */ 177 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 178 u_int ps_nenvstr; /* the number of environment strings */ 179 }; 180 181 LINUX_VDSO_SYM_INTPTR(linux32_sigcode); 182 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode); 183 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall); 184 LINUX_VDSO_SYM_CHAR(linux_platform); 185 186 /* 187 * If FreeBSD & Linux have a difference of opinion about what a trap 188 * means, deal with it here. 189 * 190 * MPSAFE 191 */ 192 static int 193 linux_translate_traps(int signal, int trap_code) 194 { 195 if (signal != SIGBUS) 196 return (signal); 197 switch (trap_code) { 198 case T_PROTFLT: 199 case T_TSSFLT: 200 case T_DOUBLEFLT: 201 case T_PAGEFLT: 202 return (SIGSEGV); 203 default: 204 return (signal); 205 } 206 } 207 208 static int 209 linux_fixup_elf(register_t **stack_base, struct image_params *imgp) 210 { 211 Elf32_Auxargs *args; 212 Elf32_Addr *base; 213 Elf32_Addr *pos; 214 struct linux32_ps_strings *arginfo; 215 int issetugid; 216 217 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 218 219 KASSERT(curthread->td_proc == imgp->proc, 220 ("unsafe linux_fixup_elf(), should be curproc")); 221 base = (Elf32_Addr *)*stack_base; 222 args = (Elf32_Auxargs *)imgp->auxargs; 223 pos = base + (imgp->args->argc + imgp->args->envc + 2); 224 225 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 226 AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO_EHDR, 227 imgp->proc->p_sysent->sv_shared_page_base); 228 AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO, linux32_vsyscall); 229 AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature); 230 231 /* 232 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 233 * as it has appeared in the 2.4.0-rc7 first time. 234 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 235 * glibc falls back to the hard-coded CLK_TCK value when aux entry 236 * is not present. 237 * Also see linux_times() implementation. 238 */ 239 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 240 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz); 241 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr); 242 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent); 243 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum); 244 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz); 245 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags); 246 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry); 247 AUXARGS_ENTRY_32(pos, AT_BASE, args->base); 248 AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, issetugid); 249 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 250 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 251 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 252 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 253 AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 254 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 255 if (imgp->execpathp != 0) 256 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 257 if (args->execfd != -1) 258 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd); 259 AUXARGS_ENTRY_32(pos, AT_NULL, 0); 260 261 free(imgp->auxargs, M_TEMP); 262 imgp->auxargs = NULL; 263 264 base--; 265 suword32(base, (uint32_t)imgp->args->argc); 266 *stack_base = (register_t *)base; 267 return (0); 268 } 269 270 static void 271 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 272 { 273 struct thread *td = curthread; 274 struct proc *p = td->td_proc; 275 struct sigacts *psp; 276 struct trapframe *regs; 277 struct l_rt_sigframe *fp, frame; 278 int oonstack; 279 int sig; 280 int code; 281 282 sig = ksi->ksi_signo; 283 code = ksi->ksi_code; 284 PROC_LOCK_ASSERT(p, MA_OWNED); 285 psp = p->p_sigacts; 286 mtx_assert(&psp->ps_mtx, MA_OWNED); 287 regs = td->td_frame; 288 oonstack = sigonstack(regs->tf_rsp); 289 290 #ifdef DEBUG 291 if (ldebug(rt_sendsig)) 292 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 293 catcher, sig, (void*)mask, code); 294 #endif 295 /* Allocate space for the signal handler context. */ 296 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 297 SIGISMEMBER(psp->ps_sigonstack, sig)) { 298 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 299 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 300 } else 301 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 302 mtx_unlock(&psp->ps_mtx); 303 304 /* Build the argument list for the signal handler. */ 305 sig = bsd_to_linux_signal(sig); 306 307 bzero(&frame, sizeof(frame)); 308 309 frame.sf_handler = PTROUT(catcher); 310 frame.sf_sig = sig; 311 frame.sf_siginfo = PTROUT(&fp->sf_si); 312 frame.sf_ucontext = PTROUT(&fp->sf_sc); 313 314 /* Fill in POSIX parts. */ 315 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 316 317 /* 318 * Build the signal context to be used by sigreturn and libgcc unwind. 319 */ 320 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 321 frame.sf_sc.uc_link = 0; /* XXX ??? */ 322 323 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 324 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 325 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 326 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 327 PROC_UNLOCK(p); 328 329 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 330 331 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 332 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 333 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 334 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 335 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 336 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 337 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 338 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 339 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 340 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 341 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 342 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 343 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 344 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 345 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 346 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 347 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 348 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 349 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 350 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 351 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 352 353 #ifdef DEBUG 354 if (ldebug(rt_sendsig)) 355 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 356 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 357 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 358 #endif 359 360 if (copyout(&frame, fp, sizeof(frame)) != 0) { 361 /* 362 * Process has trashed its stack; give it an illegal 363 * instruction to halt it in its tracks. 364 */ 365 #ifdef DEBUG 366 if (ldebug(rt_sendsig)) 367 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 368 fp, oonstack); 369 #endif 370 PROC_LOCK(p); 371 sigexit(td, SIGILL); 372 } 373 374 /* Build context to run handler in. */ 375 regs->tf_rsp = PTROUT(fp); 376 regs->tf_rip = linux32_rt_sigcode; 377 regs->tf_rflags &= ~(PSL_T | PSL_D); 378 regs->tf_cs = _ucode32sel; 379 regs->tf_ss = _udatasel; 380 regs->tf_ds = _udatasel; 381 regs->tf_es = _udatasel; 382 regs->tf_fs = _ufssel; 383 regs->tf_gs = _ugssel; 384 regs->tf_flags = TF_HASSEGS; 385 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 386 PROC_LOCK(p); 387 mtx_lock(&psp->ps_mtx); 388 } 389 390 391 /* 392 * Send an interrupt to process. 393 * 394 * Stack is set up to allow sigcode stored 395 * in u. to call routine, followed by kcall 396 * to sigreturn routine below. After sigreturn 397 * resets the signal mask, the stack, and the 398 * frame pointer, it returns to the user 399 * specified pc, psl. 400 */ 401 static void 402 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 403 { 404 struct thread *td = curthread; 405 struct proc *p = td->td_proc; 406 struct sigacts *psp; 407 struct trapframe *regs; 408 struct l_sigframe *fp, frame; 409 l_sigset_t lmask; 410 int oonstack; 411 int sig, code; 412 413 sig = ksi->ksi_signo; 414 code = ksi->ksi_code; 415 PROC_LOCK_ASSERT(p, MA_OWNED); 416 psp = p->p_sigacts; 417 mtx_assert(&psp->ps_mtx, MA_OWNED); 418 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 419 /* Signal handler installed with SA_SIGINFO. */ 420 linux_rt_sendsig(catcher, ksi, mask); 421 return; 422 } 423 424 regs = td->td_frame; 425 oonstack = sigonstack(regs->tf_rsp); 426 427 #ifdef DEBUG 428 if (ldebug(sendsig)) 429 printf(ARGS(sendsig, "%p, %d, %p, %u"), 430 catcher, sig, (void*)mask, code); 431 #endif 432 433 /* Allocate space for the signal handler context. */ 434 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 435 SIGISMEMBER(psp->ps_sigonstack, sig)) { 436 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 437 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 438 } else 439 fp = (struct l_sigframe *)regs->tf_rsp - 1; 440 mtx_unlock(&psp->ps_mtx); 441 PROC_UNLOCK(p); 442 443 /* Build the argument list for the signal handler. */ 444 sig = bsd_to_linux_signal(sig); 445 446 bzero(&frame, sizeof(frame)); 447 448 frame.sf_handler = PTROUT(catcher); 449 frame.sf_sig = sig; 450 451 bsd_to_linux_sigset(mask, &lmask); 452 453 /* Build the signal context to be used by sigreturn. */ 454 frame.sf_sc.sc_mask = lmask.__mask; 455 frame.sf_sc.sc_gs = regs->tf_gs; 456 frame.sf_sc.sc_fs = regs->tf_fs; 457 frame.sf_sc.sc_es = regs->tf_es; 458 frame.sf_sc.sc_ds = regs->tf_ds; 459 frame.sf_sc.sc_edi = regs->tf_rdi; 460 frame.sf_sc.sc_esi = regs->tf_rsi; 461 frame.sf_sc.sc_ebp = regs->tf_rbp; 462 frame.sf_sc.sc_ebx = regs->tf_rbx; 463 frame.sf_sc.sc_esp = regs->tf_rsp; 464 frame.sf_sc.sc_edx = regs->tf_rdx; 465 frame.sf_sc.sc_ecx = regs->tf_rcx; 466 frame.sf_sc.sc_eax = regs->tf_rax; 467 frame.sf_sc.sc_eip = regs->tf_rip; 468 frame.sf_sc.sc_cs = regs->tf_cs; 469 frame.sf_sc.sc_eflags = regs->tf_rflags; 470 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 471 frame.sf_sc.sc_ss = regs->tf_ss; 472 frame.sf_sc.sc_err = regs->tf_err; 473 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 474 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 475 476 frame.sf_extramask[0] = lmask.__mask; 477 478 if (copyout(&frame, fp, sizeof(frame)) != 0) { 479 /* 480 * Process has trashed its stack; give it an illegal 481 * instruction to halt it in its tracks. 482 */ 483 PROC_LOCK(p); 484 sigexit(td, SIGILL); 485 } 486 487 /* Build context to run handler in. */ 488 regs->tf_rsp = PTROUT(fp); 489 regs->tf_rip = linux32_sigcode; 490 regs->tf_rflags &= ~(PSL_T | PSL_D); 491 regs->tf_cs = _ucode32sel; 492 regs->tf_ss = _udatasel; 493 regs->tf_ds = _udatasel; 494 regs->tf_es = _udatasel; 495 regs->tf_fs = _ufssel; 496 regs->tf_gs = _ugssel; 497 regs->tf_flags = TF_HASSEGS; 498 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 499 PROC_LOCK(p); 500 mtx_lock(&psp->ps_mtx); 501 } 502 503 /* 504 * System call to cleanup state after a signal 505 * has been taken. Reset signal mask and 506 * stack state from context left by sendsig (above). 507 * Return to previous pc and psl as specified by 508 * context left by sendsig. Check carefully to 509 * make sure that the user has not modified the 510 * psl to gain improper privileges or to cause 511 * a machine fault. 512 */ 513 int 514 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 515 { 516 struct l_sigframe frame; 517 struct trapframe *regs; 518 sigset_t bmask; 519 l_sigset_t lmask; 520 int eflags; 521 ksiginfo_t ksi; 522 523 regs = td->td_frame; 524 525 #ifdef DEBUG 526 if (ldebug(sigreturn)) 527 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 528 #endif 529 /* 530 * The trampoline code hands us the sigframe. 531 * It is unsafe to keep track of it ourselves, in the event that a 532 * program jumps out of a signal handler. 533 */ 534 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 535 return (EFAULT); 536 537 /* Check for security violations. */ 538 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 539 eflags = frame.sf_sc.sc_eflags; 540 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 541 return(EINVAL); 542 543 /* 544 * Don't allow users to load a valid privileged %cs. Let the 545 * hardware check for invalid selectors, excess privilege in 546 * other selectors, invalid %eip's and invalid %esp's. 547 */ 548 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 549 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 550 ksiginfo_init_trap(&ksi); 551 ksi.ksi_signo = SIGBUS; 552 ksi.ksi_code = BUS_OBJERR; 553 ksi.ksi_trapno = T_PROTFLT; 554 ksi.ksi_addr = (void *)regs->tf_rip; 555 trapsignal(td, &ksi); 556 return(EINVAL); 557 } 558 559 lmask.__mask = frame.sf_sc.sc_mask; 560 lmask.__mask = frame.sf_extramask[0]; 561 linux_to_bsd_sigset(&lmask, &bmask); 562 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 563 564 /* Restore signal context. */ 565 regs->tf_rdi = frame.sf_sc.sc_edi; 566 regs->tf_rsi = frame.sf_sc.sc_esi; 567 regs->tf_rbp = frame.sf_sc.sc_ebp; 568 regs->tf_rbx = frame.sf_sc.sc_ebx; 569 regs->tf_rdx = frame.sf_sc.sc_edx; 570 regs->tf_rcx = frame.sf_sc.sc_ecx; 571 regs->tf_rax = frame.sf_sc.sc_eax; 572 regs->tf_rip = frame.sf_sc.sc_eip; 573 regs->tf_cs = frame.sf_sc.sc_cs; 574 regs->tf_ds = frame.sf_sc.sc_ds; 575 regs->tf_es = frame.sf_sc.sc_es; 576 regs->tf_fs = frame.sf_sc.sc_fs; 577 regs->tf_gs = frame.sf_sc.sc_gs; 578 regs->tf_rflags = eflags; 579 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 580 regs->tf_ss = frame.sf_sc.sc_ss; 581 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 582 583 return (EJUSTRETURN); 584 } 585 586 /* 587 * System call to cleanup state after a signal 588 * has been taken. Reset signal mask and 589 * stack state from context left by rt_sendsig (above). 590 * Return to previous pc and psl as specified by 591 * context left by sendsig. Check carefully to 592 * make sure that the user has not modified the 593 * psl to gain improper privileges or to cause 594 * a machine fault. 595 */ 596 int 597 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 598 { 599 struct l_ucontext uc; 600 struct l_sigcontext *context; 601 sigset_t bmask; 602 l_stack_t *lss; 603 stack_t ss; 604 struct trapframe *regs; 605 int eflags; 606 ksiginfo_t ksi; 607 608 regs = td->td_frame; 609 610 #ifdef DEBUG 611 if (ldebug(rt_sigreturn)) 612 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 613 #endif 614 /* 615 * The trampoline code hands us the ucontext. 616 * It is unsafe to keep track of it ourselves, in the event that a 617 * program jumps out of a signal handler. 618 */ 619 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 620 return (EFAULT); 621 622 context = &uc.uc_mcontext; 623 624 /* Check for security violations. */ 625 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 626 eflags = context->sc_eflags; 627 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 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(context->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_rip; 642 trapsignal(td, &ksi); 643 return(EINVAL); 644 } 645 646 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 647 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 648 649 /* 650 * Restore signal context 651 */ 652 regs->tf_gs = context->sc_gs; 653 regs->tf_fs = context->sc_fs; 654 regs->tf_es = context->sc_es; 655 regs->tf_ds = context->sc_ds; 656 regs->tf_rdi = context->sc_edi; 657 regs->tf_rsi = context->sc_esi; 658 regs->tf_rbp = context->sc_ebp; 659 regs->tf_rbx = context->sc_ebx; 660 regs->tf_rdx = context->sc_edx; 661 regs->tf_rcx = context->sc_ecx; 662 regs->tf_rax = context->sc_eax; 663 regs->tf_rip = context->sc_eip; 664 regs->tf_cs = context->sc_cs; 665 regs->tf_rflags = eflags; 666 regs->tf_rsp = context->sc_esp_at_signal; 667 regs->tf_ss = context->sc_ss; 668 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 669 670 /* 671 * call sigaltstack & ignore results.. 672 */ 673 lss = &uc.uc_stack; 674 ss.ss_sp = PTRIN(lss->ss_sp); 675 ss.ss_size = lss->ss_size; 676 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 677 678 #ifdef DEBUG 679 if (ldebug(rt_sigreturn)) 680 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 681 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 682 #endif 683 (void)kern_sigaltstack(td, &ss, NULL); 684 685 return (EJUSTRETURN); 686 } 687 688 static int 689 linux32_fetch_syscall_args(struct thread *td) 690 { 691 struct proc *p; 692 struct trapframe *frame; 693 struct syscall_args *sa; 694 695 p = td->td_proc; 696 frame = td->td_frame; 697 sa = &td->td_sa; 698 699 sa->args[0] = frame->tf_rbx; 700 sa->args[1] = frame->tf_rcx; 701 sa->args[2] = frame->tf_rdx; 702 sa->args[3] = frame->tf_rsi; 703 sa->args[4] = frame->tf_rdi; 704 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 705 sa->code = frame->tf_rax; 706 707 if (sa->code >= p->p_sysent->sv_size) 708 /* nosys */ 709 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 710 else 711 sa->callp = &p->p_sysent->sv_table[sa->code]; 712 sa->narg = sa->callp->sy_narg; 713 714 td->td_retval[0] = 0; 715 td->td_retval[1] = frame->tf_rdx; 716 717 return (0); 718 } 719 720 /* 721 * If a Linux binary is exec'ing something, try this image activator 722 * first. We override standard shell script execution in order to 723 * be able to modify the interpreter path. We only do this if a Linux 724 * binary is doing the exec, so we do not create an EXEC module for it. 725 */ 726 static int 727 linux_exec_imgact_try(struct image_params *imgp) 728 { 729 const char *head = (const char *)imgp->image_header; 730 char *rpath; 731 int error = -1; 732 733 /* 734 * The interpreter for shell scripts run from a Linux binary needs 735 * to be located in /compat/linux if possible in order to recursively 736 * maintain Linux path emulation. 737 */ 738 if (((const short *)head)[0] == SHELLMAGIC) { 739 /* 740 * Run our normal shell image activator. If it succeeds then 741 * attempt to use the alternate path for the interpreter. If 742 * an alternate path is found, use our stringspace to store it. 743 */ 744 if ((error = exec_shell_imgact(imgp)) == 0) { 745 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 746 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, 747 AT_FDCWD); 748 if (rpath != NULL) 749 imgp->args->fname_buf = 750 imgp->interpreter_name = rpath; 751 } 752 } 753 return (error); 754 } 755 756 /* 757 * Clear registers on exec 758 * XXX copied from ia32_signal.c. 759 */ 760 static void 761 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 762 { 763 struct trapframe *regs = td->td_frame; 764 struct pcb *pcb = td->td_pcb; 765 766 if (td->td_proc->p_md.md_ldt != NULL) 767 user_ldt_free(td); 768 769 critical_enter(); 770 wrmsr(MSR_FSBASE, 0); 771 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 772 pcb->pcb_fsbase = 0; 773 pcb->pcb_gsbase = 0; 774 critical_exit(); 775 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 776 777 bzero((char *)regs, sizeof(struct trapframe)); 778 regs->tf_rip = imgp->entry_addr; 779 regs->tf_rsp = stack; 780 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 781 regs->tf_gs = _ugssel; 782 regs->tf_fs = _ufssel; 783 regs->tf_es = _udatasel; 784 regs->tf_ds = _udatasel; 785 regs->tf_ss = _udatasel; 786 regs->tf_flags = TF_HASSEGS; 787 regs->tf_cs = _ucode32sel; 788 regs->tf_rbx = imgp->ps_strings; 789 790 fpstate_drop(td); 791 792 /* Do full restore on return so that we can change to a different %cs */ 793 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 794 } 795 796 /* 797 * XXX copied from ia32_sysvec.c. 798 */ 799 static register_t * 800 linux_copyout_strings(struct image_params *imgp) 801 { 802 int argc, envc; 803 u_int32_t *vectp; 804 char *stringp, *destp; 805 u_int32_t *stack_base; 806 struct linux32_ps_strings *arginfo; 807 char canary[LINUX_AT_RANDOM_LEN]; 808 size_t execpath_len; 809 810 /* Calculate string base and vector table pointers. */ 811 if (imgp->execpath != NULL && imgp->auxargs != NULL) 812 execpath_len = strlen(imgp->execpath) + 1; 813 else 814 execpath_len = 0; 815 816 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 817 destp = (caddr_t)arginfo - SPARE_USRSPACE - 818 roundup(sizeof(canary), sizeof(char *)) - 819 roundup(execpath_len, sizeof(char *)) - 820 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 821 822 if (execpath_len != 0) { 823 imgp->execpathp = (uintptr_t)arginfo - execpath_len; 824 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 825 } 826 827 /* Prepare the canary for SSP. */ 828 arc4rand(canary, sizeof(canary), 0); 829 imgp->canary = (uintptr_t)arginfo - 830 roundup(execpath_len, sizeof(char *)) - 831 roundup(sizeof(canary), sizeof(char *)); 832 copyout(canary, (void *)imgp->canary, sizeof(canary)); 833 834 /* If we have a valid auxargs ptr, prepare some room on the stack. */ 835 if (imgp->auxargs) { 836 /* 837 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 838 * lower compatibility. 839 */ 840 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 841 (LINUX_AT_COUNT * 2); 842 /* 843 * The '+ 2' is for the null pointers at the end of each of 844 * the arg and env vector sets,and imgp->auxarg_size is room 845 * for argument of Runtime loader. 846 */ 847 vectp = (u_int32_t *) (destp - (imgp->args->argc + 848 imgp->args->envc + 2 + imgp->auxarg_size) * 849 sizeof(u_int32_t)); 850 851 } else 852 /* 853 * The '+ 2' is for the null pointers at the end of each of 854 * the arg and env vector sets 855 */ 856 vectp = (u_int32_t *)(destp - (imgp->args->argc + 857 imgp->args->envc + 2) * sizeof(u_int32_t)); 858 859 /* vectp also becomes our initial stack base. */ 860 stack_base = vectp; 861 862 stringp = imgp->args->begin_argv; 863 argc = imgp->args->argc; 864 envc = imgp->args->envc; 865 /* Copy out strings - arguments and environment. */ 866 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 867 868 /* Fill in "ps_strings" struct for ps, w, etc. */ 869 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 870 suword32(&arginfo->ps_nargvstr, argc); 871 872 /* Fill in argument portion of vector table. */ 873 for (; argc > 0; --argc) { 874 suword32(vectp++, (uint32_t)(intptr_t)destp); 875 while (*stringp++ != 0) 876 destp++; 877 destp++; 878 } 879 880 /* A null vector table pointer separates the argp's from the envp's. */ 881 suword32(vectp++, 0); 882 883 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 884 suword32(&arginfo->ps_nenvstr, envc); 885 886 /* Fill in environment portion of vector table. */ 887 for (; envc > 0; --envc) { 888 suword32(vectp++, (uint32_t)(intptr_t)destp); 889 while (*stringp++ != 0) 890 destp++; 891 destp++; 892 } 893 894 /* The end of the vector table is a null pointer. */ 895 suword32(vectp, 0); 896 897 return ((register_t *)stack_base); 898 } 899 900 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 901 "32-bit Linux emulation"); 902 903 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 904 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 905 &linux32_maxdsiz, 0, ""); 906 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 907 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 908 &linux32_maxssiz, 0, ""); 909 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 910 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 911 &linux32_maxvmem, 0, ""); 912 913 #if defined(DEBUG) 914 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 915 linux_sysctl_debug, "A", "Linux debugging control"); 916 #endif 917 918 static void 919 linux32_fixlimit(struct rlimit *rl, int which) 920 { 921 922 switch (which) { 923 case RLIMIT_DATA: 924 if (linux32_maxdsiz != 0) { 925 if (rl->rlim_cur > linux32_maxdsiz) 926 rl->rlim_cur = linux32_maxdsiz; 927 if (rl->rlim_max > linux32_maxdsiz) 928 rl->rlim_max = linux32_maxdsiz; 929 } 930 break; 931 case RLIMIT_STACK: 932 if (linux32_maxssiz != 0) { 933 if (rl->rlim_cur > linux32_maxssiz) 934 rl->rlim_cur = linux32_maxssiz; 935 if (rl->rlim_max > linux32_maxssiz) 936 rl->rlim_max = linux32_maxssiz; 937 } 938 break; 939 case RLIMIT_VMEM: 940 if (linux32_maxvmem != 0) { 941 if (rl->rlim_cur > linux32_maxvmem) 942 rl->rlim_cur = linux32_maxvmem; 943 if (rl->rlim_max > linux32_maxvmem) 944 rl->rlim_max = linux32_maxvmem; 945 } 946 break; 947 } 948 } 949 950 struct sysentvec elf_linux_sysvec = { 951 .sv_size = LINUX32_SYS_MAXSYSCALL, 952 .sv_table = linux32_sysent, 953 .sv_mask = 0, 954 .sv_errsize = ELAST + 1, 955 .sv_errtbl = linux_errtbl, 956 .sv_transtrap = linux_translate_traps, 957 .sv_fixup = linux_fixup_elf, 958 .sv_sendsig = linux_sendsig, 959 .sv_sigcode = &_binary_linux32_locore_o_start, 960 .sv_szsigcode = &linux_szsigcode, 961 .sv_name = "Linux ELF32", 962 .sv_coredump = elf32_coredump, 963 .sv_imgact_try = linux_exec_imgact_try, 964 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 965 .sv_pagesize = PAGE_SIZE, 966 .sv_minuser = VM_MIN_ADDRESS, 967 .sv_maxuser = LINUX32_MAXUSER, 968 .sv_usrstack = LINUX32_USRSTACK, 969 .sv_psstrings = LINUX32_PS_STRINGS, 970 .sv_stackprot = VM_PROT_ALL, 971 .sv_copyout_strings = linux_copyout_strings, 972 .sv_setregs = linux_exec_setregs, 973 .sv_fixlimit = linux32_fixlimit, 974 .sv_maxssiz = &linux32_maxssiz, 975 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP, 976 .sv_set_syscall_retval = cpu_set_syscall_retval, 977 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 978 .sv_syscallnames = NULL, 979 .sv_shared_page_base = LINUX32_SHAREDPAGE, 980 .sv_shared_page_len = PAGE_SIZE, 981 .sv_schedtail = linux_schedtail, 982 .sv_thread_detach = linux_thread_detach, 983 .sv_trap = NULL, 984 }; 985 986 static void 987 linux_vdso_install(void *param) 988 { 989 990 linux_szsigcode = (&_binary_linux32_locore_o_end - 991 &_binary_linux32_locore_o_start); 992 993 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 994 panic("Linux invalid vdso size\n"); 995 996 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 997 998 linux_shared_page_obj = __elfN(linux_shared_page_init) 999 (&linux_shared_page_mapping); 1000 1001 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 1002 1003 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1004 linux_szsigcode); 1005 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1006 1007 linux_kplatform = linux_shared_page_mapping + 1008 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 1009 } 1010 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1011 linux_vdso_install, NULL); 1012 1013 static void 1014 linux_vdso_deinstall(void *param) 1015 { 1016 1017 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1018 } 1019 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1020 linux_vdso_deinstall, NULL); 1021 1022 static char GNU_ABI_VENDOR[] = "GNU"; 1023 static int GNULINUX_ABI_DESC = 0; 1024 1025 static bool 1026 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1027 { 1028 const Elf32_Word *desc; 1029 uintptr_t p; 1030 1031 p = (uintptr_t)(note + 1); 1032 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1033 1034 desc = (const Elf32_Word *)p; 1035 if (desc[0] != GNULINUX_ABI_DESC) 1036 return (false); 1037 1038 /* 1039 * For Linux we encode osrel as follows (see linux_mib.c): 1040 * VVVMMMIII (version, major, minor), see linux_mib.c. 1041 */ 1042 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1043 1044 return (true); 1045 } 1046 1047 static Elf_Brandnote linux32_brandnote = { 1048 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1049 .hdr.n_descsz = 16, /* XXX at least 16 */ 1050 .hdr.n_type = 1, 1051 .vendor = GNU_ABI_VENDOR, 1052 .flags = BN_TRANSLATE_OSREL, 1053 .trans_osrel = linux32_trans_osrel 1054 }; 1055 1056 static Elf32_Brandinfo linux_brand = { 1057 .brand = ELFOSABI_LINUX, 1058 .machine = EM_386, 1059 .compat_3_brand = "Linux", 1060 .emul_path = "/compat/linux", 1061 .interp_path = "/lib/ld-linux.so.1", 1062 .sysvec = &elf_linux_sysvec, 1063 .interp_newpath = NULL, 1064 .brand_note = &linux32_brandnote, 1065 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1066 }; 1067 1068 static Elf32_Brandinfo linux_glibc2brand = { 1069 .brand = ELFOSABI_LINUX, 1070 .machine = EM_386, 1071 .compat_3_brand = "Linux", 1072 .emul_path = "/compat/linux", 1073 .interp_path = "/lib/ld-linux.so.2", 1074 .sysvec = &elf_linux_sysvec, 1075 .interp_newpath = NULL, 1076 .brand_note = &linux32_brandnote, 1077 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1078 }; 1079 1080 static Elf32_Brandinfo linux_muslbrand = { 1081 .brand = ELFOSABI_LINUX, 1082 .machine = EM_386, 1083 .compat_3_brand = "Linux", 1084 .emul_path = "/compat/linux", 1085 .interp_path = "/lib/ld-musl-i386.so.1", 1086 .sysvec = &elf_linux_sysvec, 1087 .interp_newpath = NULL, 1088 .brand_note = &linux32_brandnote, 1089 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1090 }; 1091 1092 Elf32_Brandinfo *linux_brandlist[] = { 1093 &linux_brand, 1094 &linux_glibc2brand, 1095 &linux_muslbrand, 1096 NULL 1097 }; 1098 1099 static int 1100 linux_elf_modevent(module_t mod, int type, void *data) 1101 { 1102 Elf32_Brandinfo **brandinfo; 1103 int error; 1104 struct linux_ioctl_handler **lihp; 1105 1106 error = 0; 1107 1108 switch(type) { 1109 case MOD_LOAD: 1110 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1111 ++brandinfo) 1112 if (elf32_insert_brand_entry(*brandinfo) < 0) 1113 error = EINVAL; 1114 if (error == 0) { 1115 SET_FOREACH(lihp, linux_ioctl_handler_set) 1116 linux_ioctl_register_handler(*lihp); 1117 LIST_INIT(&futex_list); 1118 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1119 stclohz = (stathz ? stathz : hz); 1120 if (bootverbose) 1121 printf("Linux ELF exec handler installed\n"); 1122 } else 1123 printf("cannot insert Linux ELF brand handler\n"); 1124 break; 1125 case MOD_UNLOAD: 1126 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1127 ++brandinfo) 1128 if (elf32_brand_inuse(*brandinfo)) 1129 error = EBUSY; 1130 if (error == 0) { 1131 for (brandinfo = &linux_brandlist[0]; 1132 *brandinfo != NULL; ++brandinfo) 1133 if (elf32_remove_brand_entry(*brandinfo) < 0) 1134 error = EINVAL; 1135 } 1136 if (error == 0) { 1137 SET_FOREACH(lihp, linux_ioctl_handler_set) 1138 linux_ioctl_unregister_handler(*lihp); 1139 mtx_destroy(&futex_mtx); 1140 if (bootverbose) 1141 printf("Linux ELF exec handler removed\n"); 1142 } else 1143 printf("Could not deinstall ELF interpreter entry\n"); 1144 break; 1145 default: 1146 return (EOPNOTSUPP); 1147 } 1148 return (error); 1149 } 1150 1151 static moduledata_t linux_elf_mod = { 1152 "linuxelf", 1153 linux_elf_modevent, 1154 0 1155 }; 1156 1157 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1158 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1159 FEATURE(linux, "Linux 32bit support"); 1160