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 "opt_compat.h" 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #ifndef COMPAT_FREEBSD32 41 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 42 #endif 43 44 #define __ELF_WORD_SIZE 32 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/exec.h> 49 #include <sys/fcntl.h> 50 #include <sys/imgact.h> 51 #include <sys/imgact_elf.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/malloc.h> 55 #include <sys/module.h> 56 #include <sys/mutex.h> 57 #include <sys/proc.h> 58 #include <sys/resourcevar.h> 59 #include <sys/stddef.h> 60 #include <sys/signalvar.h> 61 #include <sys/syscallsubr.h> 62 #include <sys/sysctl.h> 63 #include <sys/sysent.h> 64 #include <sys/sysproto.h> 65 #include <sys/vnode.h> 66 #include <sys/eventhandler.h> 67 68 #include <vm/vm.h> 69 #include <vm/pmap.h> 70 #include <vm/vm_extern.h> 71 #include <vm/vm_map.h> 72 #include <vm/vm_object.h> 73 #include <vm/vm_page.h> 74 #include <vm/vm_param.h> 75 76 #include <machine/cpu.h> 77 #include <machine/md_var.h> 78 #include <machine/pcb.h> 79 #include <machine/specialreg.h> 80 #include <machine/trap.h> 81 82 #include <x86/linux/linux_x86.h> 83 #include <amd64/linux32/linux.h> 84 #include <amd64/linux32/linux32_proto.h> 85 #include <compat/linux/linux_emul.h> 86 #include <compat/linux/linux_fork.h> 87 #include <compat/linux/linux_ioctl.h> 88 #include <compat/linux/linux_mib.h> 89 #include <compat/linux/linux_misc.h> 90 #include <compat/linux/linux_signal.h> 91 #include <compat/linux/linux_util.h> 92 #include <compat/linux/linux_vdso.h> 93 94 #include <x86/linux/linux_x86_sigframe.h> 95 96 MODULE_VERSION(linux, 1); 97 98 #define LINUX32_MAXUSER ((1ul << 32) - PAGE_SIZE) 99 #define LINUX32_VDSOPAGE_SIZE PAGE_SIZE * 2 100 #define LINUX32_VDSOPAGE (LINUX32_MAXUSER - LINUX32_VDSOPAGE_SIZE) 101 #define LINUX32_SHAREDPAGE (LINUX32_VDSOPAGE - PAGE_SIZE) 102 /* 103 * PAGE_SIZE - the size 104 * of the native SHAREDPAGE 105 */ 106 #define LINUX32_USRSTACK LINUX32_SHAREDPAGE 107 108 static int linux_szsigcode; 109 static vm_object_t linux_vdso_obj; 110 static char *linux_vdso_mapping; 111 extern char _binary_linux32_vdso_so_o_start; 112 extern char _binary_linux32_vdso_so_o_end; 113 static vm_offset_t linux_vdso_base; 114 115 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 116 117 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 118 119 static int linux_fixup_elf(uintptr_t *stack_base, 120 struct image_params *iparams); 121 static int linux_copyout_strings(struct image_params *imgp, 122 uintptr_t *stack_base); 123 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 124 static void linux_exec_setregs(struct thread *td, 125 struct image_params *imgp, uintptr_t stack); 126 static void linux_exec_sysvec_init(void *param); 127 static int linux_on_exec_vmspace(struct proc *p, 128 struct image_params *imgp); 129 static void linux32_fixlimit(struct rlimit *rl, int which); 130 static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 131 static void linux_vdso_install(const void *param); 132 static void linux_vdso_deinstall(const void *param); 133 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 134 static void linux32_set_fork_retval(struct thread *td); 135 static void linux32_set_syscall_retval(struct thread *td, int error); 136 137 struct linux32_ps_strings { 138 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 139 u_int ps_nargvstr; /* the number of argument strings */ 140 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 141 u_int ps_nenvstr; /* the number of environment strings */ 142 }; 143 #define LINUX32_PS_STRINGS (LINUX32_USRSTACK - \ 144 sizeof(struct linux32_ps_strings)) 145 146 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 147 LINUX_VDSO_SYM_INTPTR(linux32_vdso_sigcode); 148 LINUX_VDSO_SYM_INTPTR(linux32_vdso_rt_sigcode); 149 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 150 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 151 LINUX_VDSO_SYM_INTPTR(kern_cpu_selector); 152 LINUX_VDSO_SYM_CHAR(linux_platform); 153 154 static int 155 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 156 { 157 Elf32_Auxargs *args; 158 Elf32_Auxinfo *argarray, *pos; 159 int error, issetugid; 160 161 args = (Elf32_Auxargs *)imgp->auxargs; 162 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 163 M_WAITOK | M_ZERO); 164 165 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 166 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 167 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 168 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 169 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 170 171 /* 172 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 173 * as it has appeared in the 2.4.0-rc7 first time. 174 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 175 * glibc falls back to the hard-coded CLK_TCK value when aux entry 176 * is not present. 177 * Also see linux_times() implementation. 178 */ 179 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 180 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 181 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 182 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 183 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 184 AUXARGS_ENTRY(pos, AT_BASE, args->base); 185 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 186 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 187 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 188 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 189 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 190 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 191 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 192 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 193 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 194 if (imgp->execpathp != 0) 195 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 196 if (args->execfd != -1) 197 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 198 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 199 AUXARGS_ENTRY(pos, AT_NULL, 0); 200 201 free(imgp->auxargs, M_TEMP); 202 imgp->auxargs = NULL; 203 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 204 205 error = copyout(argarray, (void *)base, 206 sizeof(*argarray) * LINUX_AT_COUNT); 207 free(argarray, M_TEMP); 208 return (error); 209 } 210 211 static int 212 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 213 { 214 Elf32_Addr *base; 215 216 base = (Elf32_Addr *)*stack_base; 217 base--; 218 if (suword32(base, (uint32_t)imgp->args->argc) == -1) 219 return (EFAULT); 220 *stack_base = (uintptr_t)base; 221 return (0); 222 } 223 224 static void 225 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 226 { 227 struct thread *td = curthread; 228 struct proc *p = td->td_proc; 229 struct sigacts *psp; 230 struct trapframe *regs; 231 struct l_rt_sigframe *fp, frame; 232 int oonstack; 233 int sig; 234 int code; 235 236 sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 237 code = ksi->ksi_code; 238 PROC_LOCK_ASSERT(p, MA_OWNED); 239 psp = p->p_sigacts; 240 mtx_assert(&psp->ps_mtx, MA_OWNED); 241 regs = td->td_frame; 242 oonstack = sigonstack(regs->tf_rsp); 243 244 /* Allocate space for the signal handler context. */ 245 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 246 SIGISMEMBER(psp->ps_sigonstack, sig)) { 247 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 248 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 249 } else 250 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 251 mtx_unlock(&psp->ps_mtx); 252 253 /* Build the argument list for the signal handler. */ 254 sig = bsd_to_linux_signal(sig); 255 256 bzero(&frame, sizeof(frame)); 257 258 frame.sf_sig = sig; 259 frame.sf_siginfo = PTROUT(&fp->sf_si); 260 frame.sf_ucontext = PTROUT(&fp->sf_uc); 261 262 /* Fill in POSIX parts. */ 263 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 264 265 /* 266 * Build the signal context to be used by sigreturn and libgcc unwind. 267 */ 268 frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 269 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 270 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 271 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 272 PROC_UNLOCK(p); 273 274 bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask); 275 276 frame.sf_uc.uc_mcontext.sc_mask = frame.sf_uc.uc_sigmask.__mask; 277 frame.sf_uc.uc_mcontext.sc_edi = regs->tf_rdi; 278 frame.sf_uc.uc_mcontext.sc_esi = regs->tf_rsi; 279 frame.sf_uc.uc_mcontext.sc_ebp = regs->tf_rbp; 280 frame.sf_uc.uc_mcontext.sc_ebx = regs->tf_rbx; 281 frame.sf_uc.uc_mcontext.sc_esp = regs->tf_rsp; 282 frame.sf_uc.uc_mcontext.sc_edx = regs->tf_rdx; 283 frame.sf_uc.uc_mcontext.sc_ecx = regs->tf_rcx; 284 frame.sf_uc.uc_mcontext.sc_eax = regs->tf_rax; 285 frame.sf_uc.uc_mcontext.sc_eip = regs->tf_rip; 286 frame.sf_uc.uc_mcontext.sc_cs = regs->tf_cs; 287 frame.sf_uc.uc_mcontext.sc_gs = regs->tf_gs; 288 frame.sf_uc.uc_mcontext.sc_fs = regs->tf_fs; 289 frame.sf_uc.uc_mcontext.sc_es = regs->tf_es; 290 frame.sf_uc.uc_mcontext.sc_ds = regs->tf_ds; 291 frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_rflags; 292 frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 293 frame.sf_uc.uc_mcontext.sc_ss = regs->tf_ss; 294 frame.sf_uc.uc_mcontext.sc_err = regs->tf_err; 295 frame.sf_uc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 296 frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 297 298 if (copyout(&frame, fp, sizeof(frame)) != 0) { 299 /* 300 * Process has trashed its stack; give it an illegal 301 * instruction to halt it in its tracks. 302 */ 303 PROC_LOCK(p); 304 sigexit(td, SIGILL); 305 } 306 307 /* Build context to run handler in. */ 308 regs->tf_rsp = PTROUT(fp); 309 regs->tf_rip = linux32_vdso_rt_sigcode; 310 regs->tf_rdi = PTROUT(catcher); 311 regs->tf_rflags &= ~(PSL_T | PSL_D); 312 regs->tf_cs = _ucode32sel; 313 regs->tf_ss = _udatasel; 314 regs->tf_ds = _udatasel; 315 regs->tf_es = _udatasel; 316 regs->tf_fs = _ufssel; 317 regs->tf_gs = _ugssel; 318 regs->tf_flags = TF_HASSEGS; 319 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 320 PROC_LOCK(p); 321 mtx_lock(&psp->ps_mtx); 322 } 323 324 /* 325 * Send an interrupt to process. 326 * 327 * Stack is set up to allow sigcode stored 328 * in u. to call routine, followed by kcall 329 * to sigreturn routine below. After sigreturn 330 * resets the signal mask, the stack, and the 331 * frame pointer, it returns to the user 332 * specified pc, psl. 333 */ 334 static void 335 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 336 { 337 struct thread *td = curthread; 338 struct proc *p = td->td_proc; 339 struct sigacts *psp; 340 struct trapframe *regs; 341 struct l_sigframe *fp, frame; 342 l_sigset_t lmask; 343 int oonstack; 344 int sig, code; 345 346 sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 347 code = ksi->ksi_code; 348 PROC_LOCK_ASSERT(p, MA_OWNED); 349 psp = p->p_sigacts; 350 mtx_assert(&psp->ps_mtx, MA_OWNED); 351 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 352 /* Signal handler installed with SA_SIGINFO. */ 353 linux_rt_sendsig(catcher, ksi, mask); 354 return; 355 } 356 357 regs = td->td_frame; 358 oonstack = sigonstack(regs->tf_rsp); 359 360 /* Allocate space for the signal handler context. */ 361 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 362 SIGISMEMBER(psp->ps_sigonstack, sig)) { 363 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 364 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 365 } else 366 fp = (struct l_sigframe *)regs->tf_rsp - 1; 367 mtx_unlock(&psp->ps_mtx); 368 PROC_UNLOCK(p); 369 370 /* Build the argument list for the signal handler. */ 371 sig = bsd_to_linux_signal(sig); 372 373 bzero(&frame, sizeof(frame)); 374 375 frame.sf_sig = sig; 376 frame.sf_sigmask = *mask; 377 bsd_to_linux_sigset(mask, &lmask); 378 379 /* Build the signal context to be used by sigreturn. */ 380 frame.sf_sc.sc_mask = lmask.__mask; 381 frame.sf_sc.sc_gs = regs->tf_gs; 382 frame.sf_sc.sc_fs = regs->tf_fs; 383 frame.sf_sc.sc_es = regs->tf_es; 384 frame.sf_sc.sc_ds = regs->tf_ds; 385 frame.sf_sc.sc_edi = regs->tf_rdi; 386 frame.sf_sc.sc_esi = regs->tf_rsi; 387 frame.sf_sc.sc_ebp = regs->tf_rbp; 388 frame.sf_sc.sc_ebx = regs->tf_rbx; 389 frame.sf_sc.sc_esp = regs->tf_rsp; 390 frame.sf_sc.sc_edx = regs->tf_rdx; 391 frame.sf_sc.sc_ecx = regs->tf_rcx; 392 frame.sf_sc.sc_eax = regs->tf_rax; 393 frame.sf_sc.sc_eip = regs->tf_rip; 394 frame.sf_sc.sc_cs = regs->tf_cs; 395 frame.sf_sc.sc_eflags = regs->tf_rflags; 396 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 397 frame.sf_sc.sc_ss = regs->tf_ss; 398 frame.sf_sc.sc_err = regs->tf_err; 399 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 400 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 401 402 if (copyout(&frame, fp, sizeof(frame)) != 0) { 403 /* 404 * Process has trashed its stack; give it an illegal 405 * instruction to halt it in its tracks. 406 */ 407 PROC_LOCK(p); 408 sigexit(td, SIGILL); 409 } 410 411 /* Build context to run handler in. */ 412 regs->tf_rsp = PTROUT(fp); 413 regs->tf_rip = linux32_vdso_sigcode; 414 regs->tf_rdi = PTROUT(catcher); 415 regs->tf_rflags &= ~(PSL_T | PSL_D); 416 regs->tf_cs = _ucode32sel; 417 regs->tf_ss = _udatasel; 418 regs->tf_ds = _udatasel; 419 regs->tf_es = _udatasel; 420 regs->tf_fs = _ufssel; 421 regs->tf_gs = _ugssel; 422 regs->tf_flags = TF_HASSEGS; 423 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 424 PROC_LOCK(p); 425 mtx_lock(&psp->ps_mtx); 426 } 427 428 /* 429 * System call to cleanup state after a signal 430 * has been taken. Reset signal mask and 431 * stack state from context left by sendsig (above). 432 * Return to previous pc and psl as specified by 433 * context left by sendsig. Check carefully to 434 * make sure that the user has not modified the 435 * psl to gain improper privileges or to cause 436 * a machine fault. 437 */ 438 int 439 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 440 { 441 struct l_sigframe frame; 442 struct trapframe *regs; 443 int eflags; 444 ksiginfo_t ksi; 445 446 regs = td->td_frame; 447 448 /* 449 * The trampoline code hands us the sigframe. 450 * It is unsafe to keep track of it ourselves, in the event that a 451 * program jumps out of a signal handler. 452 */ 453 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 454 return (EFAULT); 455 456 /* Check for security violations. */ 457 eflags = frame.sf_sc.sc_eflags; 458 if (!EFL_SECURE(eflags, regs->tf_rflags)) 459 return(EINVAL); 460 461 /* 462 * Don't allow users to load a valid privileged %cs. Let the 463 * hardware check for invalid selectors, excess privilege in 464 * other selectors, invalid %eip's and invalid %esp's. 465 */ 466 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 467 ksiginfo_init_trap(&ksi); 468 ksi.ksi_signo = SIGBUS; 469 ksi.ksi_code = BUS_OBJERR; 470 ksi.ksi_trapno = T_PROTFLT; 471 ksi.ksi_addr = (void *)regs->tf_rip; 472 trapsignal(td, &ksi); 473 return(EINVAL); 474 } 475 476 kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0); 477 478 /* Restore signal context. */ 479 regs->tf_rdi = frame.sf_sc.sc_edi; 480 regs->tf_rsi = frame.sf_sc.sc_esi; 481 regs->tf_rbp = frame.sf_sc.sc_ebp; 482 regs->tf_rbx = frame.sf_sc.sc_ebx; 483 regs->tf_rdx = frame.sf_sc.sc_edx; 484 regs->tf_rcx = frame.sf_sc.sc_ecx; 485 regs->tf_rax = frame.sf_sc.sc_eax; 486 regs->tf_rip = frame.sf_sc.sc_eip; 487 regs->tf_cs = frame.sf_sc.sc_cs; 488 regs->tf_ds = frame.sf_sc.sc_ds; 489 regs->tf_es = frame.sf_sc.sc_es; 490 regs->tf_fs = frame.sf_sc.sc_fs; 491 regs->tf_gs = frame.sf_sc.sc_gs; 492 regs->tf_rflags = eflags; 493 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 494 regs->tf_ss = frame.sf_sc.sc_ss; 495 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 496 497 return (EJUSTRETURN); 498 } 499 500 /* 501 * System call to cleanup state after a signal 502 * has been taken. Reset signal mask and 503 * stack state from context left by rt_sendsig (above). 504 * Return to previous pc and psl as specified by 505 * context left by sendsig. Check carefully to 506 * make sure that the user has not modified the 507 * psl to gain improper privileges or to cause 508 * a machine fault. 509 */ 510 int 511 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 512 { 513 struct l_ucontext uc; 514 struct l_sigcontext *context; 515 sigset_t bmask; 516 l_stack_t *lss; 517 stack_t ss; 518 struct trapframe *regs; 519 int eflags; 520 ksiginfo_t ksi; 521 522 regs = td->td_frame; 523 524 /* 525 * The trampoline code hands us the ucontext. 526 * It is unsafe to keep track of it ourselves, in the event that a 527 * program jumps out of a signal handler. 528 */ 529 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 530 return (EFAULT); 531 532 context = &uc.uc_mcontext; 533 534 /* Check for security violations. */ 535 eflags = context->sc_eflags; 536 if (!EFL_SECURE(eflags, regs->tf_rflags)) 537 return(EINVAL); 538 539 /* 540 * Don't allow users to load a valid privileged %cs. Let the 541 * hardware check for invalid selectors, excess privilege in 542 * other selectors, invalid %eip's and invalid %esp's. 543 */ 544 if (!CS_SECURE(context->sc_cs)) { 545 ksiginfo_init_trap(&ksi); 546 ksi.ksi_signo = SIGBUS; 547 ksi.ksi_code = BUS_OBJERR; 548 ksi.ksi_trapno = T_PROTFLT; 549 ksi.ksi_addr = (void *)regs->tf_rip; 550 trapsignal(td, &ksi); 551 return(EINVAL); 552 } 553 554 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 555 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 556 557 /* 558 * Restore signal context 559 */ 560 regs->tf_gs = context->sc_gs; 561 regs->tf_fs = context->sc_fs; 562 regs->tf_es = context->sc_es; 563 regs->tf_ds = context->sc_ds; 564 regs->tf_rdi = context->sc_edi; 565 regs->tf_rsi = context->sc_esi; 566 regs->tf_rbp = context->sc_ebp; 567 regs->tf_rbx = context->sc_ebx; 568 regs->tf_rdx = context->sc_edx; 569 regs->tf_rcx = context->sc_ecx; 570 regs->tf_rax = context->sc_eax; 571 regs->tf_rip = context->sc_eip; 572 regs->tf_cs = context->sc_cs; 573 regs->tf_rflags = eflags; 574 regs->tf_rsp = context->sc_esp_at_signal; 575 regs->tf_ss = context->sc_ss; 576 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 577 578 /* 579 * call sigaltstack & ignore results.. 580 */ 581 lss = &uc.uc_stack; 582 ss.ss_sp = PTRIN(lss->ss_sp); 583 ss.ss_size = lss->ss_size; 584 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 585 586 (void)kern_sigaltstack(td, &ss, NULL); 587 588 return (EJUSTRETURN); 589 } 590 591 static int 592 linux32_fetch_syscall_args(struct thread *td) 593 { 594 struct proc *p; 595 struct trapframe *frame; 596 struct syscall_args *sa; 597 598 p = td->td_proc; 599 frame = td->td_frame; 600 sa = &td->td_sa; 601 602 sa->args[0] = frame->tf_rbx; 603 sa->args[1] = frame->tf_rcx; 604 sa->args[2] = frame->tf_rdx; 605 sa->args[3] = frame->tf_rsi; 606 sa->args[4] = frame->tf_rdi; 607 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 608 sa->code = frame->tf_rax; 609 sa->original_code = sa->code; 610 611 if (sa->code >= p->p_sysent->sv_size) 612 /* nosys */ 613 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 614 else 615 sa->callp = &p->p_sysent->sv_table[sa->code]; 616 617 td->td_retval[0] = 0; 618 td->td_retval[1] = frame->tf_rdx; 619 620 return (0); 621 } 622 623 static void 624 linux32_set_syscall_retval(struct thread *td, int error) 625 { 626 struct trapframe *frame = td->td_frame; 627 628 cpu_set_syscall_retval(td, error); 629 630 if (__predict_false(error != 0)) { 631 if (error != ERESTART && error != EJUSTRETURN) 632 frame->tf_rax = bsd_to_linux_errno(error); 633 } 634 } 635 636 static void 637 linux32_set_fork_retval(struct thread *td) 638 { 639 struct trapframe *frame = td->td_frame; 640 641 frame->tf_rax = 0; 642 } 643 644 /* 645 * Clear registers on exec 646 * XXX copied from ia32_signal.c. 647 */ 648 static void 649 linux_exec_setregs(struct thread *td, struct image_params *imgp, 650 uintptr_t stack) 651 { 652 struct trapframe *regs = td->td_frame; 653 struct pcb *pcb = td->td_pcb; 654 register_t saved_rflags; 655 656 regs = td->td_frame; 657 pcb = td->td_pcb; 658 659 if (td->td_proc->p_md.md_ldt != NULL) 660 user_ldt_free(td); 661 662 critical_enter(); 663 wrmsr(MSR_FSBASE, 0); 664 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 665 pcb->pcb_fsbase = 0; 666 pcb->pcb_gsbase = 0; 667 critical_exit(); 668 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 669 670 saved_rflags = regs->tf_rflags & PSL_T; 671 bzero((char *)regs, sizeof(struct trapframe)); 672 regs->tf_rip = imgp->entry_addr; 673 regs->tf_rsp = stack; 674 regs->tf_rflags = PSL_USER | saved_rflags; 675 regs->tf_gs = _ugssel; 676 regs->tf_fs = _ufssel; 677 regs->tf_es = _udatasel; 678 regs->tf_ds = _udatasel; 679 regs->tf_ss = _udatasel; 680 regs->tf_flags = TF_HASSEGS; 681 regs->tf_cs = _ucode32sel; 682 regs->tf_rbx = (register_t)imgp->ps_strings; 683 684 x86_clear_dbregs(pcb); 685 686 fpstate_drop(td); 687 688 /* Do full restore on return so that we can change to a different %cs */ 689 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 690 } 691 692 /* 693 * XXX copied from ia32_sysvec.c. 694 */ 695 static int 696 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 697 { 698 int argc, envc, error; 699 u_int32_t *vectp; 700 char *stringp; 701 uintptr_t destp, ustringp; 702 struct linux32_ps_strings *arginfo; 703 char canary[LINUX_AT_RANDOM_LEN]; 704 size_t execpath_len; 705 706 arginfo = (struct linux32_ps_strings *)PROC_PS_STRINGS(imgp->proc); 707 destp = (uintptr_t)arginfo; 708 709 if (imgp->execpath != NULL && imgp->auxargs != NULL) { 710 execpath_len = strlen(imgp->execpath) + 1; 711 destp -= execpath_len; 712 destp = rounddown2(destp, sizeof(uint32_t)); 713 imgp->execpathp = (void *)destp; 714 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 715 if (error != 0) 716 return (error); 717 } 718 719 /* Prepare the canary for SSP. */ 720 arc4rand(canary, sizeof(canary), 0); 721 destp -= roundup(sizeof(canary), sizeof(uint32_t)); 722 imgp->canary = (void *)destp; 723 error = copyout(canary, imgp->canary, sizeof(canary)); 724 if (error != 0) 725 return (error); 726 727 /* Allocate room for the argument and environment strings. */ 728 destp -= ARG_MAX - imgp->args->stringspace; 729 destp = rounddown2(destp, sizeof(uint32_t)); 730 ustringp = destp; 731 732 if (imgp->auxargs) { 733 /* 734 * Allocate room on the stack for the ELF auxargs 735 * array. It has LINUX_AT_COUNT entries. 736 */ 737 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 738 destp = rounddown2(destp, sizeof(uint32_t)); 739 } 740 741 vectp = (uint32_t *)destp; 742 743 /* 744 * Allocate room for the argv[] and env vectors including the 745 * terminating NULL pointers. 746 */ 747 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 748 749 /* vectp also becomes our initial stack base. */ 750 *stack_base = (uintptr_t)vectp; 751 752 stringp = imgp->args->begin_argv; 753 argc = imgp->args->argc; 754 envc = imgp->args->envc; 755 756 /* Copy out strings - arguments and environment. */ 757 error = copyout(stringp, (void *)ustringp, 758 ARG_MAX - imgp->args->stringspace); 759 if (error != 0) 760 return (error); 761 762 /* Fill in "ps_strings" struct for ps, w, etc. */ 763 if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || 764 suword32(&arginfo->ps_nargvstr, argc) != 0) 765 return (EFAULT); 766 767 /* Fill in argument portion of vector table. */ 768 for (; argc > 0; --argc) { 769 if (suword32(vectp++, ustringp) != 0) 770 return (EFAULT); 771 while (*stringp++ != 0) 772 ustringp++; 773 ustringp++; 774 } 775 776 /* A null vector table pointer separates the argp's from the envp's. */ 777 if (suword32(vectp++, 0) != 0) 778 return (EFAULT); 779 780 if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || 781 suword32(&arginfo->ps_nenvstr, envc) != 0) 782 return (EFAULT); 783 784 /* Fill in environment portion of vector table. */ 785 for (; envc > 0; --envc) { 786 if (suword32(vectp++, ustringp) != 0) 787 return (EFAULT); 788 while (*stringp++ != 0) 789 ustringp++; 790 ustringp++; 791 } 792 793 /* The end of the vector table is a null pointer. */ 794 if (suword32(vectp, 0) != 0) 795 return (EFAULT); 796 797 if (imgp->auxargs) { 798 vectp++; 799 error = imgp->sysent->sv_copyout_auxargs(imgp, 800 (uintptr_t)vectp); 801 if (error != 0) 802 return (error); 803 } 804 805 return (0); 806 } 807 808 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 809 "32-bit Linux emulation"); 810 811 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 812 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 813 &linux32_maxdsiz, 0, ""); 814 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 815 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 816 &linux32_maxssiz, 0, ""); 817 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 818 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 819 &linux32_maxvmem, 0, ""); 820 bool linux32_emulate_i386 = false; 821 SYSCTL_BOOL(_compat_linux32, OID_AUTO, emulate_i386, CTLFLAG_RWTUN, 822 &linux32_emulate_i386, 0, "Emulate the real i386"); 823 824 static void 825 linux32_fixlimit(struct rlimit *rl, int which) 826 { 827 828 switch (which) { 829 case RLIMIT_DATA: 830 if (linux32_maxdsiz != 0) { 831 if (rl->rlim_cur > linux32_maxdsiz) 832 rl->rlim_cur = linux32_maxdsiz; 833 if (rl->rlim_max > linux32_maxdsiz) 834 rl->rlim_max = linux32_maxdsiz; 835 } 836 break; 837 case RLIMIT_STACK: 838 if (linux32_maxssiz != 0) { 839 if (rl->rlim_cur > linux32_maxssiz) 840 rl->rlim_cur = linux32_maxssiz; 841 if (rl->rlim_max > linux32_maxssiz) 842 rl->rlim_max = linux32_maxssiz; 843 } 844 break; 845 case RLIMIT_VMEM: 846 if (linux32_maxvmem != 0) { 847 if (rl->rlim_cur > linux32_maxvmem) 848 rl->rlim_cur = linux32_maxvmem; 849 if (rl->rlim_max > linux32_maxvmem) 850 rl->rlim_max = linux32_maxvmem; 851 } 852 break; 853 } 854 } 855 856 struct sysentvec elf_linux_sysvec = { 857 .sv_size = LINUX32_SYS_MAXSYSCALL, 858 .sv_table = linux32_sysent, 859 .sv_fixup = linux_fixup_elf, 860 .sv_sendsig = linux_sendsig, 861 .sv_sigcode = &_binary_linux32_vdso_so_o_start, 862 .sv_szsigcode = &linux_szsigcode, 863 .sv_name = "Linux ELF32", 864 .sv_coredump = elf32_coredump, 865 .sv_elf_core_osabi = ELFOSABI_NONE, 866 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 867 .sv_elf_core_prepare_notes = linux32_prepare_notes, 868 .sv_imgact_try = linux_exec_imgact_try, 869 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 870 .sv_minuser = VM_MIN_ADDRESS, 871 .sv_maxuser = LINUX32_MAXUSER, 872 .sv_usrstack = LINUX32_USRSTACK, 873 .sv_psstrings = LINUX32_PS_STRINGS, 874 .sv_psstringssz = sizeof(struct linux32_ps_strings), 875 .sv_stackprot = VM_PROT_ALL, 876 .sv_copyout_auxargs = linux_copyout_auxargs, 877 .sv_copyout_strings = linux_copyout_strings, 878 .sv_setregs = linux_exec_setregs, 879 .sv_fixlimit = linux32_fixlimit, 880 .sv_maxssiz = &linux32_maxssiz, 881 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | 882 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 883 .sv_set_syscall_retval = linux32_set_syscall_retval, 884 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 885 .sv_syscallnames = NULL, 886 .sv_shared_page_base = LINUX32_SHAREDPAGE, 887 .sv_shared_page_len = PAGE_SIZE, 888 .sv_schedtail = linux_schedtail, 889 .sv_thread_detach = linux_thread_detach, 890 .sv_trap = NULL, 891 .sv_onexec = linux_on_exec_vmspace, 892 .sv_onexit = linux_on_exit, 893 .sv_ontdexit = linux_thread_dtor, 894 .sv_setid_allowed = &linux_setid_allowed_query, 895 .sv_set_fork_retval = linux32_set_fork_retval, 896 }; 897 898 static int 899 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 900 { 901 int error; 902 903 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 904 LINUX32_VDSOPAGE_SIZE, imgp); 905 if (error == 0) 906 linux_on_exec(p, imgp); 907 return (error); 908 } 909 910 /* 911 * linux_vdso_install() and linux_exec_sysvec_init() must be called 912 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 913 */ 914 static void 915 linux_exec_sysvec_init(void *param) 916 { 917 l_uintptr_t *ktimekeep_base, *ktsc_selector; 918 struct sysentvec *sv; 919 ptrdiff_t tkoff; 920 921 sv = param; 922 /* Fill timekeep_base */ 923 exec_sysvec_init(sv); 924 925 tkoff = kern_timekeep_base - linux_vdso_base; 926 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 927 *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset; 928 929 tkoff = kern_tsc_selector - linux_vdso_base; 930 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 931 *ktsc_selector = linux_vdso_tsc_selector_idx(); 932 if (bootverbose) 933 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 934 935 tkoff = kern_cpu_selector - linux_vdso_base; 936 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 937 *ktsc_selector = linux_vdso_cpu_selector_idx(); 938 if (bootverbose) 939 printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector); 940 } 941 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 942 linux_exec_sysvec_init, &elf_linux_sysvec); 943 944 static void 945 linux_vdso_install(const void *param) 946 { 947 char *vdso_start = &_binary_linux32_vdso_so_o_start; 948 char *vdso_end = &_binary_linux32_vdso_so_o_end; 949 950 linux_szsigcode = vdso_end - vdso_start; 951 MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE); 952 953 linux_vdso_base = LINUX32_VDSOPAGE; 954 955 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 956 957 linux_vdso_obj = __elfN(linux_shared_page_init) 958 (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 959 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 960 961 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 962 } 963 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 964 linux_vdso_install, NULL); 965 966 static void 967 linux_vdso_deinstall(const void *param) 968 { 969 970 __elfN(linux_shared_page_fini)(linux_vdso_obj, 971 linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 972 } 973 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 974 linux_vdso_deinstall, NULL); 975 976 static void 977 linux_vdso_reloc(char *mapping, Elf_Addr offset) 978 { 979 const Elf_Shdr *shdr; 980 const Elf_Rel *rel; 981 const Elf_Ehdr *ehdr; 982 Elf32_Addr *where; 983 Elf_Size rtype, symidx; 984 Elf32_Addr addr, addend; 985 int i, relcnt; 986 987 MPASS(offset != 0); 988 989 relcnt = 0; 990 ehdr = (const Elf_Ehdr *)mapping; 991 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 992 for (i = 0; i < ehdr->e_shnum; i++) 993 { 994 switch (shdr[i].sh_type) { 995 case SHT_REL: 996 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 997 relcnt = shdr[i].sh_size / sizeof(*rel); 998 break; 999 case SHT_RELA: 1000 printf("Linux i386 vDSO: unexpected Rela section\n"); 1001 break; 1002 } 1003 } 1004 1005 for (i = 0; i < relcnt; i++, rel++) { 1006 where = (Elf32_Addr *)(mapping + rel->r_offset); 1007 addend = *where; 1008 rtype = ELF_R_TYPE(rel->r_info); 1009 symidx = ELF_R_SYM(rel->r_info); 1010 1011 switch (rtype) { 1012 case R_386_NONE: /* none */ 1013 break; 1014 1015 case R_386_RELATIVE: /* B + A */ 1016 addr = (Elf32_Addr)PTROUT(offset + addend); 1017 if (*where != addr) 1018 *where = addr; 1019 break; 1020 1021 case R_386_IRELATIVE: 1022 printf("Linux i386 vDSO: unexpected ifunc relocation, " 1023 "symbol index %ld\n", (intmax_t)symidx); 1024 break; 1025 default: 1026 printf("Linux i386 vDSO: unexpected relocation type %ld, " 1027 "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx); 1028 } 1029 } 1030 } 1031 1032 static char GNU_ABI_VENDOR[] = "GNU"; 1033 static int GNULINUX_ABI_DESC = 0; 1034 1035 static bool 1036 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1037 { 1038 const Elf32_Word *desc; 1039 uintptr_t p; 1040 1041 p = (uintptr_t)(note + 1); 1042 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1043 1044 desc = (const Elf32_Word *)p; 1045 if (desc[0] != GNULINUX_ABI_DESC) 1046 return (false); 1047 1048 /* 1049 * For Linux we encode osrel using the Linux convention of 1050 * (version << 16) | (major << 8) | (minor) 1051 * See macro in linux_mib.h 1052 */ 1053 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1054 1055 return (true); 1056 } 1057 1058 static Elf_Brandnote linux32_brandnote = { 1059 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1060 .hdr.n_descsz = 16, /* XXX at least 16 */ 1061 .hdr.n_type = 1, 1062 .vendor = GNU_ABI_VENDOR, 1063 .flags = BN_TRANSLATE_OSREL, 1064 .trans_osrel = linux32_trans_osrel 1065 }; 1066 1067 static Elf32_Brandinfo linux_brand = { 1068 .brand = ELFOSABI_LINUX, 1069 .machine = EM_386, 1070 .compat_3_brand = "Linux", 1071 .emul_path = linux_emul_path, 1072 .interp_path = "/lib/ld-linux.so.1", 1073 .sysvec = &elf_linux_sysvec, 1074 .interp_newpath = NULL, 1075 .brand_note = &linux32_brandnote, 1076 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1077 }; 1078 1079 static Elf32_Brandinfo linux_glibc2brand = { 1080 .brand = ELFOSABI_LINUX, 1081 .machine = EM_386, 1082 .compat_3_brand = "Linux", 1083 .emul_path = linux_emul_path, 1084 .interp_path = "/lib/ld-linux.so.2", 1085 .sysvec = &elf_linux_sysvec, 1086 .interp_newpath = NULL, 1087 .brand_note = &linux32_brandnote, 1088 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1089 }; 1090 1091 static Elf32_Brandinfo linux_muslbrand = { 1092 .brand = ELFOSABI_LINUX, 1093 .machine = EM_386, 1094 .compat_3_brand = "Linux", 1095 .emul_path = linux_emul_path, 1096 .interp_path = "/lib/ld-musl-i386.so.1", 1097 .sysvec = &elf_linux_sysvec, 1098 .interp_newpath = NULL, 1099 .brand_note = &linux32_brandnote, 1100 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1101 LINUX_BI_FUTEX_REQUEUE 1102 }; 1103 1104 Elf32_Brandinfo *linux_brandlist[] = { 1105 &linux_brand, 1106 &linux_glibc2brand, 1107 &linux_muslbrand, 1108 NULL 1109 }; 1110 1111 static int 1112 linux_elf_modevent(module_t mod, int type, void *data) 1113 { 1114 Elf32_Brandinfo **brandinfo; 1115 int error; 1116 struct linux_ioctl_handler **lihp; 1117 1118 error = 0; 1119 1120 switch(type) { 1121 case MOD_LOAD: 1122 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1123 ++brandinfo) 1124 if (elf32_insert_brand_entry(*brandinfo) < 0) 1125 error = EINVAL; 1126 if (error == 0) { 1127 SET_FOREACH(lihp, linux_ioctl_handler_set) 1128 linux32_ioctl_register_handler(*lihp); 1129 stclohz = (stathz ? stathz : hz); 1130 if (bootverbose) 1131 printf("Linux i386 ELF exec handler installed\n"); 1132 } else 1133 printf("cannot insert Linux i386 ELF brand handler\n"); 1134 break; 1135 case MOD_UNLOAD: 1136 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1137 ++brandinfo) 1138 if (elf32_brand_inuse(*brandinfo)) 1139 error = EBUSY; 1140 if (error == 0) { 1141 for (brandinfo = &linux_brandlist[0]; 1142 *brandinfo != NULL; ++brandinfo) 1143 if (elf32_remove_brand_entry(*brandinfo) < 0) 1144 error = EINVAL; 1145 } 1146 if (error == 0) { 1147 SET_FOREACH(lihp, linux_ioctl_handler_set) 1148 linux32_ioctl_unregister_handler(*lihp); 1149 if (bootverbose) 1150 printf("Linux i386 ELF exec handler removed\n"); 1151 } else 1152 printf("Could not deinstall Linux i386 ELF interpreter entry\n"); 1153 break; 1154 default: 1155 return (EOPNOTSUPP); 1156 } 1157 return (error); 1158 } 1159 1160 static moduledata_t linux_elf_mod = { 1161 "linuxelf", 1162 linux_elf_modevent, 1163 0 1164 }; 1165 1166 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1167 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1168 FEATURE(linux, "Linux 32bit support"); 1169