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 #include <machine/trap.h> 79 80 #include <amd64/linux32/linux.h> 81 #include <amd64/linux32/linux32_proto.h> 82 #include <compat/linux/linux_emul.h> 83 #include <compat/linux/linux_futex.h> 84 #include <compat/linux/linux_ioctl.h> 85 #include <compat/linux/linux_mib.h> 86 #include <compat/linux/linux_misc.h> 87 #include <compat/linux/linux_signal.h> 88 #include <compat/linux/linux_util.h> 89 #include <compat/linux/linux_vdso.h> 90 91 MODULE_VERSION(linux, 1); 92 93 #define AUXARGS_ENTRY_32(pos, id, val) \ 94 do { \ 95 suword32(pos++, id); \ 96 suword32(pos++, val); \ 97 } while (0) 98 99 #if BYTE_ORDER == LITTLE_ENDIAN 100 #define SHELLMAGIC 0x2123 /* #! */ 101 #else 102 #define SHELLMAGIC 0x2321 103 #endif 104 105 /* 106 * Allow the sendsig functions to use the ldebug() facility even though they 107 * are not syscalls themselves. Map them to syscall 0. This is slightly less 108 * bogus than using ldebug(sigreturn). 109 */ 110 #define LINUX32_SYS_linux_rt_sendsig 0 111 #define LINUX32_SYS_linux_sendsig 0 112 113 const char *linux_kplatform; 114 static int linux_szsigcode; 115 static vm_object_t linux_shared_page_obj; 116 static char *linux_shared_page_mapping; 117 extern char _binary_linux32_locore_o_start; 118 extern char _binary_linux32_locore_o_end; 119 120 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 121 122 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 123 124 static int linux_fixup_elf(register_t **stack_base, 125 struct image_params *iparams); 126 static register_t *linux_copyout_strings(struct image_params *imgp); 127 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 128 static int linux_exec_imgact_try(struct image_params *iparams); 129 static void linux_exec_setregs(struct thread *td, 130 struct image_params *imgp, u_long stack); 131 static void linux32_fixlimit(struct rlimit *rl, int which); 132 static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 133 static void linux_vdso_install(void *param); 134 static void linux_vdso_deinstall(void *param); 135 136 #define LINUX_T_UNKNOWN 255 137 static int _bsd_to_linux_trapcode[] = { 138 LINUX_T_UNKNOWN, /* 0 */ 139 6, /* 1 T_PRIVINFLT */ 140 LINUX_T_UNKNOWN, /* 2 */ 141 3, /* 3 T_BPTFLT */ 142 LINUX_T_UNKNOWN, /* 4 */ 143 LINUX_T_UNKNOWN, /* 5 */ 144 16, /* 6 T_ARITHTRAP */ 145 254, /* 7 T_ASTFLT */ 146 LINUX_T_UNKNOWN, /* 8 */ 147 13, /* 9 T_PROTFLT */ 148 1, /* 10 T_TRCTRAP */ 149 LINUX_T_UNKNOWN, /* 11 */ 150 14, /* 12 T_PAGEFLT */ 151 LINUX_T_UNKNOWN, /* 13 */ 152 17, /* 14 T_ALIGNFLT */ 153 LINUX_T_UNKNOWN, /* 15 */ 154 LINUX_T_UNKNOWN, /* 16 */ 155 LINUX_T_UNKNOWN, /* 17 */ 156 0, /* 18 T_DIVIDE */ 157 2, /* 19 T_NMI */ 158 4, /* 20 T_OFLOW */ 159 5, /* 21 T_BOUND */ 160 7, /* 22 T_DNA */ 161 8, /* 23 T_DOUBLEFLT */ 162 9, /* 24 T_FPOPFLT */ 163 10, /* 25 T_TSSFLT */ 164 11, /* 26 T_SEGNPFLT */ 165 12, /* 27 T_STKFLT */ 166 18, /* 28 T_MCHK */ 167 19, /* 29 T_XMMFLT */ 168 15 /* 30 T_RESERVED */ 169 }; 170 #define bsd_to_linux_trapcode(code) \ 171 ((code)<nitems(_bsd_to_linux_trapcode)? \ 172 _bsd_to_linux_trapcode[(code)]: \ 173 LINUX_T_UNKNOWN) 174 175 struct linux32_ps_strings { 176 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 177 u_int ps_nargvstr; /* the number of argument strings */ 178 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 179 u_int ps_nenvstr; /* the number of environment strings */ 180 }; 181 182 LINUX_VDSO_SYM_INTPTR(linux32_sigcode); 183 LINUX_VDSO_SYM_INTPTR(linux32_rt_sigcode); 184 LINUX_VDSO_SYM_INTPTR(linux32_vsyscall); 185 LINUX_VDSO_SYM_CHAR(linux_platform); 186 187 /* 188 * If FreeBSD & Linux have a difference of opinion about what a trap 189 * means, deal with it here. 190 * 191 * MPSAFE 192 */ 193 static int 194 linux_translate_traps(int signal, int trap_code) 195 { 196 if (signal != SIGBUS) 197 return (signal); 198 switch (trap_code) { 199 case T_PROTFLT: 200 case T_TSSFLT: 201 case T_DOUBLEFLT: 202 case T_PAGEFLT: 203 return (SIGSEGV); 204 default: 205 return (signal); 206 } 207 } 208 209 static int 210 linux_fixup_elf(register_t **stack_base, struct image_params *imgp) 211 { 212 Elf32_Auxargs *args; 213 Elf32_Addr *base; 214 Elf32_Addr *pos; 215 struct linux32_ps_strings *arginfo; 216 int issetugid; 217 218 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 219 220 KASSERT(curthread->td_proc == imgp->proc, 221 ("unsafe linux_fixup_elf(), should be curproc")); 222 base = (Elf32_Addr *)*stack_base; 223 args = (Elf32_Auxargs *)imgp->auxargs; 224 pos = base + (imgp->args->argc + imgp->args->envc + 2); 225 226 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 227 AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO_EHDR, 228 imgp->proc->p_sysent->sv_shared_page_base); 229 AUXARGS_ENTRY_32(pos, LINUX_AT_SYSINFO, linux32_vsyscall); 230 AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature); 231 232 /* 233 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 234 * as it has appeared in the 2.4.0-rc7 first time. 235 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 236 * glibc falls back to the hard-coded CLK_TCK value when aux entry 237 * is not present. 238 * Also see linux_times() implementation. 239 */ 240 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 241 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz); 242 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr); 243 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent); 244 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum); 245 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz); 246 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags); 247 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry); 248 AUXARGS_ENTRY_32(pos, AT_BASE, args->base); 249 AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, issetugid); 250 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 251 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 252 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 253 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 254 AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 255 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 256 if (imgp->execpathp != 0) 257 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 258 if (args->execfd != -1) 259 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd); 260 AUXARGS_ENTRY_32(pos, AT_NULL, 0); 261 262 free(imgp->auxargs, M_TEMP); 263 imgp->auxargs = NULL; 264 265 base--; 266 suword32(base, (uint32_t)imgp->args->argc); 267 *stack_base = (register_t *)base; 268 return (0); 269 } 270 271 static void 272 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 273 { 274 struct thread *td = curthread; 275 struct proc *p = td->td_proc; 276 struct sigacts *psp; 277 struct trapframe *regs; 278 struct l_rt_sigframe *fp, frame; 279 int oonstack; 280 int sig; 281 int code; 282 283 sig = ksi->ksi_signo; 284 code = ksi->ksi_code; 285 PROC_LOCK_ASSERT(p, MA_OWNED); 286 psp = p->p_sigacts; 287 mtx_assert(&psp->ps_mtx, MA_OWNED); 288 regs = td->td_frame; 289 oonstack = sigonstack(regs->tf_rsp); 290 291 #ifdef DEBUG 292 if (ldebug(rt_sendsig)) 293 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 294 catcher, sig, (void*)mask, code); 295 #endif 296 /* Allocate space for the signal handler context. */ 297 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 298 SIGISMEMBER(psp->ps_sigonstack, sig)) { 299 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 300 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 301 } else 302 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 303 mtx_unlock(&psp->ps_mtx); 304 305 /* Build the argument list for the signal handler. */ 306 sig = bsd_to_linux_signal(sig); 307 308 bzero(&frame, sizeof(frame)); 309 310 frame.sf_handler = PTROUT(catcher); 311 frame.sf_sig = sig; 312 frame.sf_siginfo = PTROUT(&fp->sf_si); 313 frame.sf_ucontext = PTROUT(&fp->sf_sc); 314 315 /* Fill in POSIX parts. */ 316 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 317 318 /* 319 * Build the signal context to be used by sigreturn and libgcc unwind. 320 */ 321 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 322 frame.sf_sc.uc_link = 0; /* XXX ??? */ 323 324 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 325 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 326 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 327 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 328 PROC_UNLOCK(p); 329 330 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 331 332 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 333 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 334 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 335 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 336 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 337 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 338 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 339 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 340 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 341 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 342 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 343 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 344 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 345 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 346 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 347 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 348 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 349 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 350 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 351 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 352 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 353 354 #ifdef DEBUG 355 if (ldebug(rt_sendsig)) 356 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 357 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 358 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 359 #endif 360 361 if (copyout(&frame, fp, sizeof(frame)) != 0) { 362 /* 363 * Process has trashed its stack; give it an illegal 364 * instruction to halt it in its tracks. 365 */ 366 #ifdef DEBUG 367 if (ldebug(rt_sendsig)) 368 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 369 fp, oonstack); 370 #endif 371 PROC_LOCK(p); 372 sigexit(td, SIGILL); 373 } 374 375 /* Build context to run handler in. */ 376 regs->tf_rsp = PTROUT(fp); 377 regs->tf_rip = linux32_rt_sigcode; 378 regs->tf_rflags &= ~(PSL_T | PSL_D); 379 regs->tf_cs = _ucode32sel; 380 regs->tf_ss = _udatasel; 381 regs->tf_ds = _udatasel; 382 regs->tf_es = _udatasel; 383 regs->tf_fs = _ufssel; 384 regs->tf_gs = _ugssel; 385 regs->tf_flags = TF_HASSEGS; 386 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 387 PROC_LOCK(p); 388 mtx_lock(&psp->ps_mtx); 389 } 390 391 392 /* 393 * Send an interrupt to process. 394 * 395 * Stack is set up to allow sigcode stored 396 * in u. to call routine, followed by kcall 397 * to sigreturn routine below. After sigreturn 398 * resets the signal mask, the stack, and the 399 * frame pointer, it returns to the user 400 * specified pc, psl. 401 */ 402 static void 403 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 404 { 405 struct thread *td = curthread; 406 struct proc *p = td->td_proc; 407 struct sigacts *psp; 408 struct trapframe *regs; 409 struct l_sigframe *fp, frame; 410 l_sigset_t lmask; 411 int oonstack; 412 int sig, code; 413 414 sig = ksi->ksi_signo; 415 code = ksi->ksi_code; 416 PROC_LOCK_ASSERT(p, MA_OWNED); 417 psp = p->p_sigacts; 418 mtx_assert(&psp->ps_mtx, MA_OWNED); 419 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 420 /* Signal handler installed with SA_SIGINFO. */ 421 linux_rt_sendsig(catcher, ksi, mask); 422 return; 423 } 424 425 regs = td->td_frame; 426 oonstack = sigonstack(regs->tf_rsp); 427 428 #ifdef DEBUG 429 if (ldebug(sendsig)) 430 printf(ARGS(sendsig, "%p, %d, %p, %u"), 431 catcher, sig, (void*)mask, code); 432 #endif 433 434 /* Allocate space for the signal handler context. */ 435 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 436 SIGISMEMBER(psp->ps_sigonstack, sig)) { 437 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 438 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 439 } else 440 fp = (struct l_sigframe *)regs->tf_rsp - 1; 441 mtx_unlock(&psp->ps_mtx); 442 PROC_UNLOCK(p); 443 444 /* Build the argument list for the signal handler. */ 445 sig = bsd_to_linux_signal(sig); 446 447 bzero(&frame, sizeof(frame)); 448 449 frame.sf_handler = PTROUT(catcher); 450 frame.sf_sig = sig; 451 452 bsd_to_linux_sigset(mask, &lmask); 453 454 /* Build the signal context to be used by sigreturn. */ 455 frame.sf_sc.sc_mask = lmask.__mask; 456 frame.sf_sc.sc_gs = regs->tf_gs; 457 frame.sf_sc.sc_fs = regs->tf_fs; 458 frame.sf_sc.sc_es = regs->tf_es; 459 frame.sf_sc.sc_ds = regs->tf_ds; 460 frame.sf_sc.sc_edi = regs->tf_rdi; 461 frame.sf_sc.sc_esi = regs->tf_rsi; 462 frame.sf_sc.sc_ebp = regs->tf_rbp; 463 frame.sf_sc.sc_ebx = regs->tf_rbx; 464 frame.sf_sc.sc_esp = regs->tf_rsp; 465 frame.sf_sc.sc_edx = regs->tf_rdx; 466 frame.sf_sc.sc_ecx = regs->tf_rcx; 467 frame.sf_sc.sc_eax = regs->tf_rax; 468 frame.sf_sc.sc_eip = regs->tf_rip; 469 frame.sf_sc.sc_cs = regs->tf_cs; 470 frame.sf_sc.sc_eflags = regs->tf_rflags; 471 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 472 frame.sf_sc.sc_ss = regs->tf_ss; 473 frame.sf_sc.sc_err = regs->tf_err; 474 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 475 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 476 477 frame.sf_extramask[0] = lmask.__mask; 478 479 if (copyout(&frame, fp, sizeof(frame)) != 0) { 480 /* 481 * Process has trashed its stack; give it an illegal 482 * instruction to halt it in its tracks. 483 */ 484 PROC_LOCK(p); 485 sigexit(td, SIGILL); 486 } 487 488 /* Build context to run handler in. */ 489 regs->tf_rsp = PTROUT(fp); 490 regs->tf_rip = linux32_sigcode; 491 regs->tf_rflags &= ~(PSL_T | PSL_D); 492 regs->tf_cs = _ucode32sel; 493 regs->tf_ss = _udatasel; 494 regs->tf_ds = _udatasel; 495 regs->tf_es = _udatasel; 496 regs->tf_fs = _ufssel; 497 regs->tf_gs = _ugssel; 498 regs->tf_flags = TF_HASSEGS; 499 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 500 PROC_LOCK(p); 501 mtx_lock(&psp->ps_mtx); 502 } 503 504 /* 505 * System call to cleanup state after a signal 506 * has been taken. Reset signal mask and 507 * stack state from context left by sendsig (above). 508 * Return to previous pc and psl as specified by 509 * context left by sendsig. Check carefully to 510 * make sure that the user has not modified the 511 * psl to gain improper privileges or to cause 512 * a machine fault. 513 */ 514 int 515 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 516 { 517 struct l_sigframe frame; 518 struct trapframe *regs; 519 sigset_t bmask; 520 l_sigset_t lmask; 521 int eflags; 522 ksiginfo_t ksi; 523 524 regs = td->td_frame; 525 526 #ifdef DEBUG 527 if (ldebug(sigreturn)) 528 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 529 #endif 530 /* 531 * The trampoline code hands us the sigframe. 532 * It is unsafe to keep track of it ourselves, in the event that a 533 * program jumps out of a signal handler. 534 */ 535 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 536 return (EFAULT); 537 538 /* Check for security violations. */ 539 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 540 eflags = frame.sf_sc.sc_eflags; 541 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 542 return(EINVAL); 543 544 /* 545 * Don't allow users to load a valid privileged %cs. Let the 546 * hardware check for invalid selectors, excess privilege in 547 * other selectors, invalid %eip's and invalid %esp's. 548 */ 549 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 550 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 551 ksiginfo_init_trap(&ksi); 552 ksi.ksi_signo = SIGBUS; 553 ksi.ksi_code = BUS_OBJERR; 554 ksi.ksi_trapno = T_PROTFLT; 555 ksi.ksi_addr = (void *)regs->tf_rip; 556 trapsignal(td, &ksi); 557 return(EINVAL); 558 } 559 560 lmask.__mask = frame.sf_sc.sc_mask; 561 lmask.__mask = frame.sf_extramask[0]; 562 linux_to_bsd_sigset(&lmask, &bmask); 563 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 564 565 /* Restore signal context. */ 566 regs->tf_rdi = frame.sf_sc.sc_edi; 567 regs->tf_rsi = frame.sf_sc.sc_esi; 568 regs->tf_rbp = frame.sf_sc.sc_ebp; 569 regs->tf_rbx = frame.sf_sc.sc_ebx; 570 regs->tf_rdx = frame.sf_sc.sc_edx; 571 regs->tf_rcx = frame.sf_sc.sc_ecx; 572 regs->tf_rax = frame.sf_sc.sc_eax; 573 regs->tf_rip = frame.sf_sc.sc_eip; 574 regs->tf_cs = frame.sf_sc.sc_cs; 575 regs->tf_ds = frame.sf_sc.sc_ds; 576 regs->tf_es = frame.sf_sc.sc_es; 577 regs->tf_fs = frame.sf_sc.sc_fs; 578 regs->tf_gs = frame.sf_sc.sc_gs; 579 regs->tf_rflags = eflags; 580 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 581 regs->tf_ss = frame.sf_sc.sc_ss; 582 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 583 584 return (EJUSTRETURN); 585 } 586 587 /* 588 * System call to cleanup state after a signal 589 * has been taken. Reset signal mask and 590 * stack state from context left by rt_sendsig (above). 591 * Return to previous pc and psl as specified by 592 * context left by sendsig. Check carefully to 593 * make sure that the user has not modified the 594 * psl to gain improper privileges or to cause 595 * a machine fault. 596 */ 597 int 598 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 599 { 600 struct l_ucontext uc; 601 struct l_sigcontext *context; 602 sigset_t bmask; 603 l_stack_t *lss; 604 stack_t ss; 605 struct trapframe *regs; 606 int eflags; 607 ksiginfo_t ksi; 608 609 regs = td->td_frame; 610 611 #ifdef DEBUG 612 if (ldebug(rt_sigreturn)) 613 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 614 #endif 615 /* 616 * The trampoline code hands us the ucontext. 617 * It is unsafe to keep track of it ourselves, in the event that a 618 * program jumps out of a signal handler. 619 */ 620 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 621 return (EFAULT); 622 623 context = &uc.uc_mcontext; 624 625 /* Check for security violations. */ 626 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 627 eflags = context->sc_eflags; 628 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 629 return(EINVAL); 630 631 /* 632 * Don't allow users to load a valid privileged %cs. Let the 633 * hardware check for invalid selectors, excess privilege in 634 * other selectors, invalid %eip's and invalid %esp's. 635 */ 636 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 637 if (!CS_SECURE(context->sc_cs)) { 638 ksiginfo_init_trap(&ksi); 639 ksi.ksi_signo = SIGBUS; 640 ksi.ksi_code = BUS_OBJERR; 641 ksi.ksi_trapno = T_PROTFLT; 642 ksi.ksi_addr = (void *)regs->tf_rip; 643 trapsignal(td, &ksi); 644 return(EINVAL); 645 } 646 647 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 648 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 649 650 /* 651 * Restore signal context 652 */ 653 regs->tf_gs = context->sc_gs; 654 regs->tf_fs = context->sc_fs; 655 regs->tf_es = context->sc_es; 656 regs->tf_ds = context->sc_ds; 657 regs->tf_rdi = context->sc_edi; 658 regs->tf_rsi = context->sc_esi; 659 regs->tf_rbp = context->sc_ebp; 660 regs->tf_rbx = context->sc_ebx; 661 regs->tf_rdx = context->sc_edx; 662 regs->tf_rcx = context->sc_ecx; 663 regs->tf_rax = context->sc_eax; 664 regs->tf_rip = context->sc_eip; 665 regs->tf_cs = context->sc_cs; 666 regs->tf_rflags = eflags; 667 regs->tf_rsp = context->sc_esp_at_signal; 668 regs->tf_ss = context->sc_ss; 669 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 670 671 /* 672 * call sigaltstack & ignore results.. 673 */ 674 lss = &uc.uc_stack; 675 ss.ss_sp = PTRIN(lss->ss_sp); 676 ss.ss_size = lss->ss_size; 677 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 678 679 #ifdef DEBUG 680 if (ldebug(rt_sigreturn)) 681 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 682 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 683 #endif 684 (void)kern_sigaltstack(td, &ss, NULL); 685 686 return (EJUSTRETURN); 687 } 688 689 static int 690 linux32_fetch_syscall_args(struct thread *td) 691 { 692 struct proc *p; 693 struct trapframe *frame; 694 struct syscall_args *sa; 695 696 p = td->td_proc; 697 frame = td->td_frame; 698 sa = &td->td_sa; 699 700 sa->args[0] = frame->tf_rbx; 701 sa->args[1] = frame->tf_rcx; 702 sa->args[2] = frame->tf_rdx; 703 sa->args[3] = frame->tf_rsi; 704 sa->args[4] = frame->tf_rdi; 705 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 706 sa->code = frame->tf_rax; 707 708 if (sa->code >= p->p_sysent->sv_size) 709 /* nosys */ 710 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 711 else 712 sa->callp = &p->p_sysent->sv_table[sa->code]; 713 sa->narg = sa->callp->sy_narg; 714 715 td->td_retval[0] = 0; 716 td->td_retval[1] = frame->tf_rdx; 717 718 return (0); 719 } 720 721 /* 722 * If a Linux binary is exec'ing something, try this image activator 723 * first. We override standard shell script execution in order to 724 * be able to modify the interpreter path. We only do this if a Linux 725 * binary is doing the exec, so we do not create an EXEC module for it. 726 */ 727 static int 728 linux_exec_imgact_try(struct image_params *imgp) 729 { 730 const char *head = (const char *)imgp->image_header; 731 char *rpath; 732 int error = -1; 733 734 /* 735 * The interpreter for shell scripts run from a Linux binary needs 736 * to be located in /compat/linux if possible in order to recursively 737 * maintain Linux path emulation. 738 */ 739 if (((const short *)head)[0] == SHELLMAGIC) { 740 /* 741 * Run our normal shell image activator. If it succeeds then 742 * attempt to use the alternate path for the interpreter. If 743 * an alternate path is found, use our stringspace to store it. 744 */ 745 if ((error = exec_shell_imgact(imgp)) == 0) { 746 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 747 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, 748 AT_FDCWD); 749 if (rpath != NULL) 750 imgp->args->fname_buf = 751 imgp->interpreter_name = rpath; 752 } 753 } 754 return (error); 755 } 756 757 /* 758 * Clear registers on exec 759 * XXX copied from ia32_signal.c. 760 */ 761 static void 762 linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack) 763 { 764 struct trapframe *regs = td->td_frame; 765 struct pcb *pcb = td->td_pcb; 766 767 if (td->td_proc->p_md.md_ldt != NULL) 768 user_ldt_free(td); 769 770 critical_enter(); 771 wrmsr(MSR_FSBASE, 0); 772 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 773 pcb->pcb_fsbase = 0; 774 pcb->pcb_gsbase = 0; 775 critical_exit(); 776 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 777 778 bzero((char *)regs, sizeof(struct trapframe)); 779 regs->tf_rip = imgp->entry_addr; 780 regs->tf_rsp = stack; 781 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 782 regs->tf_gs = _ugssel; 783 regs->tf_fs = _ufssel; 784 regs->tf_es = _udatasel; 785 regs->tf_ds = _udatasel; 786 regs->tf_ss = _udatasel; 787 regs->tf_flags = TF_HASSEGS; 788 regs->tf_cs = _ucode32sel; 789 regs->tf_rbx = imgp->ps_strings; 790 791 fpstate_drop(td); 792 793 /* Do full restore on return so that we can change to a different %cs */ 794 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 795 } 796 797 /* 798 * XXX copied from ia32_sysvec.c. 799 */ 800 static register_t * 801 linux_copyout_strings(struct image_params *imgp) 802 { 803 int argc, envc; 804 u_int32_t *vectp; 805 char *stringp, *destp; 806 u_int32_t *stack_base; 807 struct linux32_ps_strings *arginfo; 808 char canary[LINUX_AT_RANDOM_LEN]; 809 size_t execpath_len; 810 811 /* Calculate string base and vector table pointers. */ 812 if (imgp->execpath != NULL && imgp->auxargs != NULL) 813 execpath_len = strlen(imgp->execpath) + 1; 814 else 815 execpath_len = 0; 816 817 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 818 destp = (caddr_t)arginfo - SPARE_USRSPACE - 819 roundup(sizeof(canary), sizeof(char *)) - 820 roundup(execpath_len, sizeof(char *)) - 821 roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *)); 822 823 if (execpath_len != 0) { 824 imgp->execpathp = (uintptr_t)arginfo - execpath_len; 825 copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len); 826 } 827 828 /* Prepare the canary for SSP. */ 829 arc4rand(canary, sizeof(canary), 0); 830 imgp->canary = (uintptr_t)arginfo - 831 roundup(execpath_len, sizeof(char *)) - 832 roundup(sizeof(canary), sizeof(char *)); 833 copyout(canary, (void *)imgp->canary, sizeof(canary)); 834 835 /* If we have a valid auxargs ptr, prepare some room on the stack. */ 836 if (imgp->auxargs) { 837 /* 838 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 839 * lower compatibility. 840 */ 841 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 842 (LINUX_AT_COUNT * 2); 843 /* 844 * The '+ 2' is for the null pointers at the end of each of 845 * the arg and env vector sets,and imgp->auxarg_size is room 846 * for argument of Runtime loader. 847 */ 848 vectp = (u_int32_t *) (destp - (imgp->args->argc + 849 imgp->args->envc + 2 + imgp->auxarg_size) * 850 sizeof(u_int32_t)); 851 852 } else 853 /* 854 * The '+ 2' is for the null pointers at the end of each of 855 * the arg and env vector sets 856 */ 857 vectp = (u_int32_t *)(destp - (imgp->args->argc + 858 imgp->args->envc + 2) * sizeof(u_int32_t)); 859 860 /* vectp also becomes our initial stack base. */ 861 stack_base = vectp; 862 863 stringp = imgp->args->begin_argv; 864 argc = imgp->args->argc; 865 envc = imgp->args->envc; 866 /* Copy out strings - arguments and environment. */ 867 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 868 869 /* Fill in "ps_strings" struct for ps, w, etc. */ 870 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 871 suword32(&arginfo->ps_nargvstr, argc); 872 873 /* Fill in argument portion of vector table. */ 874 for (; argc > 0; --argc) { 875 suword32(vectp++, (uint32_t)(intptr_t)destp); 876 while (*stringp++ != 0) 877 destp++; 878 destp++; 879 } 880 881 /* A null vector table pointer separates the argp's from the envp's. */ 882 suword32(vectp++, 0); 883 884 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 885 suword32(&arginfo->ps_nenvstr, envc); 886 887 /* Fill in environment portion of vector table. */ 888 for (; envc > 0; --envc) { 889 suword32(vectp++, (uint32_t)(intptr_t)destp); 890 while (*stringp++ != 0) 891 destp++; 892 destp++; 893 } 894 895 /* The end of the vector table is a null pointer. */ 896 suword32(vectp, 0); 897 898 return ((register_t *)stack_base); 899 } 900 901 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 902 "32-bit Linux emulation"); 903 904 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 905 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 906 &linux32_maxdsiz, 0, ""); 907 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 908 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 909 &linux32_maxssiz, 0, ""); 910 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 911 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 912 &linux32_maxvmem, 0, ""); 913 914 #if defined(DEBUG) 915 SYSCTL_PROC(_compat_linux32, OID_AUTO, debug, CTLTYPE_STRING | CTLFLAG_RW, 0, 0, 916 linux_sysctl_debug, "A", "Linux debugging control"); 917 #endif 918 919 static void 920 linux32_fixlimit(struct rlimit *rl, int which) 921 { 922 923 switch (which) { 924 case RLIMIT_DATA: 925 if (linux32_maxdsiz != 0) { 926 if (rl->rlim_cur > linux32_maxdsiz) 927 rl->rlim_cur = linux32_maxdsiz; 928 if (rl->rlim_max > linux32_maxdsiz) 929 rl->rlim_max = linux32_maxdsiz; 930 } 931 break; 932 case RLIMIT_STACK: 933 if (linux32_maxssiz != 0) { 934 if (rl->rlim_cur > linux32_maxssiz) 935 rl->rlim_cur = linux32_maxssiz; 936 if (rl->rlim_max > linux32_maxssiz) 937 rl->rlim_max = linux32_maxssiz; 938 } 939 break; 940 case RLIMIT_VMEM: 941 if (linux32_maxvmem != 0) { 942 if (rl->rlim_cur > linux32_maxvmem) 943 rl->rlim_cur = linux32_maxvmem; 944 if (rl->rlim_max > linux32_maxvmem) 945 rl->rlim_max = linux32_maxvmem; 946 } 947 break; 948 } 949 } 950 951 struct sysentvec elf_linux_sysvec = { 952 .sv_size = LINUX32_SYS_MAXSYSCALL, 953 .sv_table = linux32_sysent, 954 .sv_mask = 0, 955 .sv_errsize = ELAST + 1, 956 .sv_errtbl = linux_errtbl, 957 .sv_transtrap = linux_translate_traps, 958 .sv_fixup = linux_fixup_elf, 959 .sv_sendsig = linux_sendsig, 960 .sv_sigcode = &_binary_linux32_locore_o_start, 961 .sv_szsigcode = &linux_szsigcode, 962 .sv_name = "Linux ELF32", 963 .sv_coredump = elf32_coredump, 964 .sv_imgact_try = linux_exec_imgact_try, 965 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 966 .sv_pagesize = PAGE_SIZE, 967 .sv_minuser = VM_MIN_ADDRESS, 968 .sv_maxuser = LINUX32_MAXUSER, 969 .sv_usrstack = LINUX32_USRSTACK, 970 .sv_psstrings = LINUX32_PS_STRINGS, 971 .sv_stackprot = VM_PROT_ALL, 972 .sv_copyout_strings = linux_copyout_strings, 973 .sv_setregs = linux_exec_setregs, 974 .sv_fixlimit = linux32_fixlimit, 975 .sv_maxssiz = &linux32_maxssiz, 976 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP, 977 .sv_set_syscall_retval = cpu_set_syscall_retval, 978 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 979 .sv_syscallnames = NULL, 980 .sv_shared_page_base = LINUX32_SHAREDPAGE, 981 .sv_shared_page_len = PAGE_SIZE, 982 .sv_schedtail = linux_schedtail, 983 .sv_thread_detach = linux_thread_detach, 984 .sv_trap = NULL, 985 }; 986 987 static void 988 linux_vdso_install(void *param) 989 { 990 991 linux_szsigcode = (&_binary_linux32_locore_o_end - 992 &_binary_linux32_locore_o_start); 993 994 if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len) 995 panic("Linux invalid vdso size\n"); 996 997 __elfN(linux_vdso_fixup)(&elf_linux_sysvec); 998 999 linux_shared_page_obj = __elfN(linux_shared_page_init) 1000 (&linux_shared_page_mapping); 1001 1002 __elfN(linux_vdso_reloc)(&elf_linux_sysvec); 1003 1004 bcopy(elf_linux_sysvec.sv_sigcode, linux_shared_page_mapping, 1005 linux_szsigcode); 1006 elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj; 1007 1008 linux_kplatform = linux_shared_page_mapping + 1009 (linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base); 1010 } 1011 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY, 1012 linux_vdso_install, NULL); 1013 1014 static void 1015 linux_vdso_deinstall(void *param) 1016 { 1017 1018 __elfN(linux_shared_page_fini)(linux_shared_page_obj); 1019 } 1020 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1021 linux_vdso_deinstall, NULL); 1022 1023 static char GNU_ABI_VENDOR[] = "GNU"; 1024 static int GNULINUX_ABI_DESC = 0; 1025 1026 static bool 1027 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1028 { 1029 const Elf32_Word *desc; 1030 uintptr_t p; 1031 1032 p = (uintptr_t)(note + 1); 1033 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1034 1035 desc = (const Elf32_Word *)p; 1036 if (desc[0] != GNULINUX_ABI_DESC) 1037 return (false); 1038 1039 /* 1040 * For Linux we encode osrel as follows (see linux_mib.c): 1041 * VVVMMMIII (version, major, minor), see linux_mib.c. 1042 */ 1043 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1044 1045 return (true); 1046 } 1047 1048 static Elf_Brandnote linux32_brandnote = { 1049 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1050 .hdr.n_descsz = 16, /* XXX at least 16 */ 1051 .hdr.n_type = 1, 1052 .vendor = GNU_ABI_VENDOR, 1053 .flags = BN_TRANSLATE_OSREL, 1054 .trans_osrel = linux32_trans_osrel 1055 }; 1056 1057 static Elf32_Brandinfo linux_brand = { 1058 .brand = ELFOSABI_LINUX, 1059 .machine = EM_386, 1060 .compat_3_brand = "Linux", 1061 .emul_path = "/compat/linux", 1062 .interp_path = "/lib/ld-linux.so.1", 1063 .sysvec = &elf_linux_sysvec, 1064 .interp_newpath = NULL, 1065 .brand_note = &linux32_brandnote, 1066 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1067 }; 1068 1069 static Elf32_Brandinfo linux_glibc2brand = { 1070 .brand = ELFOSABI_LINUX, 1071 .machine = EM_386, 1072 .compat_3_brand = "Linux", 1073 .emul_path = "/compat/linux", 1074 .interp_path = "/lib/ld-linux.so.2", 1075 .sysvec = &elf_linux_sysvec, 1076 .interp_newpath = NULL, 1077 .brand_note = &linux32_brandnote, 1078 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1079 }; 1080 1081 static Elf32_Brandinfo linux_muslbrand = { 1082 .brand = ELFOSABI_LINUX, 1083 .machine = EM_386, 1084 .compat_3_brand = "Linux", 1085 .emul_path = "/compat/linux", 1086 .interp_path = "/lib/ld-musl-i386.so.1", 1087 .sysvec = &elf_linux_sysvec, 1088 .interp_newpath = NULL, 1089 .brand_note = &linux32_brandnote, 1090 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1091 }; 1092 1093 Elf32_Brandinfo *linux_brandlist[] = { 1094 &linux_brand, 1095 &linux_glibc2brand, 1096 &linux_muslbrand, 1097 NULL 1098 }; 1099 1100 static int 1101 linux_elf_modevent(module_t mod, int type, void *data) 1102 { 1103 Elf32_Brandinfo **brandinfo; 1104 int error; 1105 struct linux_ioctl_handler **lihp; 1106 1107 error = 0; 1108 1109 switch(type) { 1110 case MOD_LOAD: 1111 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1112 ++brandinfo) 1113 if (elf32_insert_brand_entry(*brandinfo) < 0) 1114 error = EINVAL; 1115 if (error == 0) { 1116 SET_FOREACH(lihp, linux_ioctl_handler_set) 1117 linux_ioctl_register_handler(*lihp); 1118 LIST_INIT(&futex_list); 1119 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1120 stclohz = (stathz ? stathz : hz); 1121 if (bootverbose) 1122 printf("Linux ELF exec handler installed\n"); 1123 } else 1124 printf("cannot insert Linux ELF brand handler\n"); 1125 break; 1126 case MOD_UNLOAD: 1127 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1128 ++brandinfo) 1129 if (elf32_brand_inuse(*brandinfo)) 1130 error = EBUSY; 1131 if (error == 0) { 1132 for (brandinfo = &linux_brandlist[0]; 1133 *brandinfo != NULL; ++brandinfo) 1134 if (elf32_remove_brand_entry(*brandinfo) < 0) 1135 error = EINVAL; 1136 } 1137 if (error == 0) { 1138 SET_FOREACH(lihp, linux_ioctl_handler_set) 1139 linux_ioctl_unregister_handler(*lihp); 1140 mtx_destroy(&futex_mtx); 1141 if (bootverbose) 1142 printf("Linux ELF exec handler removed\n"); 1143 } else 1144 printf("Could not deinstall ELF interpreter entry\n"); 1145 break; 1146 default: 1147 return (EOPNOTSUPP); 1148 } 1149 return (error); 1150 } 1151 1152 static moduledata_t linux_elf_mod = { 1153 "linuxelf", 1154 linux_elf_modevent, 1155 0 1156 }; 1157 1158 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1159 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1160 FEATURE(linux, "Linux 32bit support"); 1161