Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/linux32/linux32_sysvec.c
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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 extern const char *linux32_syscallnames[]; 117 118 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 119 120 static int linux_fixup_elf(uintptr_t *stack_base, 121 struct image_params *iparams); 122 static int linux_copyout_strings(struct image_params *imgp, 123 uintptr_t *stack_base); 124 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 125 static void linux_exec_setregs(struct thread *td, 126 struct image_params *imgp, uintptr_t stack); 127 static void linux_exec_sysvec_init(void *param); 128 static int linux_on_exec_vmspace(struct proc *p, 129 struct image_params *imgp); 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(const void *param); 133 static void linux_vdso_deinstall(const void *param); 134 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 135 static void linux32_set_fork_retval(struct thread *td); 136 static void linux32_set_syscall_retval(struct thread *td, int error); 137 138 struct linux32_ps_strings { 139 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 140 u_int ps_nargvstr; /* the number of argument strings */ 141 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 142 u_int ps_nenvstr; /* the number of environment strings */ 143 }; 144 #define LINUX32_PS_STRINGS (LINUX32_USRSTACK - \ 145 sizeof(struct linux32_ps_strings)) 146 147 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 148 LINUX_VDSO_SYM_INTPTR(linux32_vdso_sigcode); 149 LINUX_VDSO_SYM_INTPTR(linux32_vdso_rt_sigcode); 150 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 151 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 152 LINUX_VDSO_SYM_INTPTR(kern_cpu_selector); 153 LINUX_VDSO_SYM_CHAR(linux_platform); 154 155 static int 156 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 157 { 158 Elf32_Auxargs *args; 159 Elf32_Auxinfo *argarray, *pos; 160 int error, issetugid; 161 162 args = (Elf32_Auxargs *)imgp->auxargs; 163 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 164 M_WAITOK | M_ZERO); 165 166 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 167 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 168 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 169 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 170 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 171 172 /* 173 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 174 * as it has appeared in the 2.4.0-rc7 first time. 175 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 176 * glibc falls back to the hard-coded CLK_TCK value when aux entry 177 * is not present. 178 * Also see linux_times() implementation. 179 */ 180 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 181 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 182 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 183 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 184 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 185 AUXARGS_ENTRY(pos, AT_BASE, args->base); 186 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 187 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 188 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 189 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 190 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 191 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 192 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 193 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 194 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 195 if (imgp->execpathp != 0) 196 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 197 if (args->execfd != -1) 198 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 199 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 200 AUXARGS_ENTRY(pos, AT_NULL, 0); 201 202 free(imgp->auxargs, M_TEMP); 203 imgp->auxargs = NULL; 204 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 205 206 error = copyout(argarray, (void *)base, 207 sizeof(*argarray) * LINUX_AT_COUNT); 208 free(argarray, M_TEMP); 209 return (error); 210 } 211 212 static int 213 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 214 { 215 Elf32_Addr *base; 216 217 base = (Elf32_Addr *)*stack_base; 218 base--; 219 if (suword32(base, (uint32_t)imgp->args->argc) == -1) 220 return (EFAULT); 221 *stack_base = (uintptr_t)base; 222 return (0); 223 } 224 225 static void 226 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 227 { 228 struct thread *td = curthread; 229 struct proc *p = td->td_proc; 230 struct sigacts *psp; 231 struct trapframe *regs; 232 struct l_rt_sigframe *fp, frame; 233 int oonstack; 234 int sig; 235 int code; 236 237 sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 238 code = ksi->ksi_code; 239 PROC_LOCK_ASSERT(p, MA_OWNED); 240 psp = p->p_sigacts; 241 mtx_assert(&psp->ps_mtx, MA_OWNED); 242 regs = td->td_frame; 243 oonstack = sigonstack(regs->tf_rsp); 244 245 /* Allocate space for the signal handler context. */ 246 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 247 SIGISMEMBER(psp->ps_sigonstack, sig)) { 248 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 249 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 250 } else 251 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 252 mtx_unlock(&psp->ps_mtx); 253 254 /* Build the argument list for the signal handler. */ 255 sig = bsd_to_linux_signal(sig); 256 257 bzero(&frame, sizeof(frame)); 258 259 frame.sf_sig = sig; 260 frame.sf_siginfo = PTROUT(&fp->sf_si); 261 frame.sf_ucontext = PTROUT(&fp->sf_uc); 262 263 /* Fill in POSIX parts. */ 264 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 265 266 /* 267 * Build the signal context to be used by sigreturn and libgcc unwind. 268 */ 269 frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 270 frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 271 frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 272 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 273 PROC_UNLOCK(p); 274 275 bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask); 276 277 frame.sf_uc.uc_mcontext.sc_mask = frame.sf_uc.uc_sigmask.__mask; 278 frame.sf_uc.uc_mcontext.sc_edi = regs->tf_rdi; 279 frame.sf_uc.uc_mcontext.sc_esi = regs->tf_rsi; 280 frame.sf_uc.uc_mcontext.sc_ebp = regs->tf_rbp; 281 frame.sf_uc.uc_mcontext.sc_ebx = regs->tf_rbx; 282 frame.sf_uc.uc_mcontext.sc_esp = regs->tf_rsp; 283 frame.sf_uc.uc_mcontext.sc_edx = regs->tf_rdx; 284 frame.sf_uc.uc_mcontext.sc_ecx = regs->tf_rcx; 285 frame.sf_uc.uc_mcontext.sc_eax = regs->tf_rax; 286 frame.sf_uc.uc_mcontext.sc_eip = regs->tf_rip; 287 frame.sf_uc.uc_mcontext.sc_cs = regs->tf_cs; 288 frame.sf_uc.uc_mcontext.sc_gs = regs->tf_gs; 289 frame.sf_uc.uc_mcontext.sc_fs = regs->tf_fs; 290 frame.sf_uc.uc_mcontext.sc_es = regs->tf_es; 291 frame.sf_uc.uc_mcontext.sc_ds = regs->tf_ds; 292 frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_rflags; 293 frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 294 frame.sf_uc.uc_mcontext.sc_ss = regs->tf_ss; 295 frame.sf_uc.uc_mcontext.sc_err = regs->tf_err; 296 frame.sf_uc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 297 frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 298 299 if (copyout(&frame, fp, sizeof(frame)) != 0) { 300 /* 301 * Process has trashed its stack; give it an illegal 302 * instruction to halt it in its tracks. 303 */ 304 PROC_LOCK(p); 305 sigexit(td, SIGILL); 306 } 307 308 /* Build context to run handler in. */ 309 regs->tf_rsp = PTROUT(fp); 310 regs->tf_rip = linux32_vdso_rt_sigcode; 311 regs->tf_rdi = PTROUT(catcher); 312 regs->tf_rflags &= ~(PSL_T | PSL_D); 313 regs->tf_cs = _ucode32sel; 314 regs->tf_ss = _udatasel; 315 regs->tf_ds = _udatasel; 316 regs->tf_es = _udatasel; 317 regs->tf_fs = _ufssel; 318 regs->tf_gs = _ugssel; 319 regs->tf_flags = TF_HASSEGS; 320 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 321 PROC_LOCK(p); 322 mtx_lock(&psp->ps_mtx); 323 } 324 325 /* 326 * Send an interrupt to process. 327 * 328 * Stack is set up to allow sigcode stored 329 * in u. to call routine, followed by kcall 330 * to sigreturn routine below. After sigreturn 331 * resets the signal mask, the stack, and the 332 * frame pointer, it returns to the user 333 * specified pc, psl. 334 */ 335 static void 336 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 337 { 338 struct thread *td = curthread; 339 struct proc *p = td->td_proc; 340 struct sigacts *psp; 341 struct trapframe *regs; 342 struct l_sigframe *fp, frame; 343 l_sigset_t lmask; 344 int oonstack; 345 int sig, code; 346 347 sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno); 348 code = ksi->ksi_code; 349 PROC_LOCK_ASSERT(p, MA_OWNED); 350 psp = p->p_sigacts; 351 mtx_assert(&psp->ps_mtx, MA_OWNED); 352 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 353 /* Signal handler installed with SA_SIGINFO. */ 354 linux_rt_sendsig(catcher, ksi, mask); 355 return; 356 } 357 358 regs = td->td_frame; 359 oonstack = sigonstack(regs->tf_rsp); 360 361 /* Allocate space for the signal handler context. */ 362 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 363 SIGISMEMBER(psp->ps_sigonstack, sig)) { 364 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 365 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 366 } else 367 fp = (struct l_sigframe *)regs->tf_rsp - 1; 368 mtx_unlock(&psp->ps_mtx); 369 PROC_UNLOCK(p); 370 371 /* Build the argument list for the signal handler. */ 372 sig = bsd_to_linux_signal(sig); 373 374 bzero(&frame, sizeof(frame)); 375 376 frame.sf_sig = sig; 377 frame.sf_sigmask = *mask; 378 bsd_to_linux_sigset(mask, &lmask); 379 380 /* Build the signal context to be used by sigreturn. */ 381 frame.sf_sc.sc_mask = lmask.__mask; 382 frame.sf_sc.sc_gs = regs->tf_gs; 383 frame.sf_sc.sc_fs = regs->tf_fs; 384 frame.sf_sc.sc_es = regs->tf_es; 385 frame.sf_sc.sc_ds = regs->tf_ds; 386 frame.sf_sc.sc_edi = regs->tf_rdi; 387 frame.sf_sc.sc_esi = regs->tf_rsi; 388 frame.sf_sc.sc_ebp = regs->tf_rbp; 389 frame.sf_sc.sc_ebx = regs->tf_rbx; 390 frame.sf_sc.sc_esp = regs->tf_rsp; 391 frame.sf_sc.sc_edx = regs->tf_rdx; 392 frame.sf_sc.sc_ecx = regs->tf_rcx; 393 frame.sf_sc.sc_eax = regs->tf_rax; 394 frame.sf_sc.sc_eip = regs->tf_rip; 395 frame.sf_sc.sc_cs = regs->tf_cs; 396 frame.sf_sc.sc_eflags = regs->tf_rflags; 397 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 398 frame.sf_sc.sc_ss = regs->tf_ss; 399 frame.sf_sc.sc_err = regs->tf_err; 400 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 401 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 402 403 if (copyout(&frame, fp, sizeof(frame)) != 0) { 404 /* 405 * Process has trashed its stack; give it an illegal 406 * instruction to halt it in its tracks. 407 */ 408 PROC_LOCK(p); 409 sigexit(td, SIGILL); 410 } 411 412 /* Build context to run handler in. */ 413 regs->tf_rsp = PTROUT(fp); 414 regs->tf_rip = linux32_vdso_sigcode; 415 regs->tf_rdi = PTROUT(catcher); 416 regs->tf_rflags &= ~(PSL_T | PSL_D); 417 regs->tf_cs = _ucode32sel; 418 regs->tf_ss = _udatasel; 419 regs->tf_ds = _udatasel; 420 regs->tf_es = _udatasel; 421 regs->tf_fs = _ufssel; 422 regs->tf_gs = _ugssel; 423 regs->tf_flags = TF_HASSEGS; 424 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 425 PROC_LOCK(p); 426 mtx_lock(&psp->ps_mtx); 427 } 428 429 /* 430 * System call to cleanup state after a signal 431 * has been taken. Reset signal mask and 432 * stack state from context left by sendsig (above). 433 * Return to previous pc and psl as specified by 434 * context left by sendsig. Check carefully to 435 * make sure that the user has not modified the 436 * psl to gain improper privileges or to cause 437 * a machine fault. 438 */ 439 int 440 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 441 { 442 struct l_sigframe frame; 443 struct trapframe *regs; 444 int eflags; 445 ksiginfo_t ksi; 446 447 regs = td->td_frame; 448 449 /* 450 * The trampoline code hands us the sigframe. 451 * It is unsafe to keep track of it ourselves, in the event that a 452 * program jumps out of a signal handler. 453 */ 454 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 455 return (EFAULT); 456 457 /* Check for security violations. */ 458 eflags = frame.sf_sc.sc_eflags; 459 if (!EFL_SECURE(eflags, regs->tf_rflags)) 460 return(EINVAL); 461 462 /* 463 * Don't allow users to load a valid privileged %cs. Let the 464 * hardware check for invalid selectors, excess privilege in 465 * other selectors, invalid %eip's and invalid %esp's. 466 */ 467 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 468 ksiginfo_init_trap(&ksi); 469 ksi.ksi_signo = SIGBUS; 470 ksi.ksi_code = BUS_OBJERR; 471 ksi.ksi_trapno = T_PROTFLT; 472 ksi.ksi_addr = (void *)regs->tf_rip; 473 trapsignal(td, &ksi); 474 return(EINVAL); 475 } 476 477 kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0); 478 479 /* Restore signal context. */ 480 regs->tf_rdi = frame.sf_sc.sc_edi; 481 regs->tf_rsi = frame.sf_sc.sc_esi; 482 regs->tf_rbp = frame.sf_sc.sc_ebp; 483 regs->tf_rbx = frame.sf_sc.sc_ebx; 484 regs->tf_rdx = frame.sf_sc.sc_edx; 485 regs->tf_rcx = frame.sf_sc.sc_ecx; 486 regs->tf_rax = frame.sf_sc.sc_eax; 487 regs->tf_rip = frame.sf_sc.sc_eip; 488 regs->tf_cs = frame.sf_sc.sc_cs; 489 regs->tf_ds = frame.sf_sc.sc_ds; 490 regs->tf_es = frame.sf_sc.sc_es; 491 regs->tf_fs = frame.sf_sc.sc_fs; 492 regs->tf_gs = frame.sf_sc.sc_gs; 493 regs->tf_rflags = eflags; 494 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 495 regs->tf_ss = frame.sf_sc.sc_ss; 496 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 497 498 return (EJUSTRETURN); 499 } 500 501 /* 502 * System call to cleanup state after a signal 503 * has been taken. Reset signal mask and 504 * stack state from context left by rt_sendsig (above). 505 * Return to previous pc and psl as specified by 506 * context left by sendsig. Check carefully to 507 * make sure that the user has not modified the 508 * psl to gain improper privileges or to cause 509 * a machine fault. 510 */ 511 int 512 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 513 { 514 struct l_ucontext uc; 515 struct l_sigcontext *context; 516 sigset_t bmask; 517 l_stack_t *lss; 518 stack_t ss; 519 struct trapframe *regs; 520 int eflags; 521 ksiginfo_t ksi; 522 523 regs = td->td_frame; 524 525 /* 526 * The trampoline code hands us the ucontext. 527 * It is unsafe to keep track of it ourselves, in the event that a 528 * program jumps out of a signal handler. 529 */ 530 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 531 return (EFAULT); 532 533 context = &uc.uc_mcontext; 534 535 /* Check for security violations. */ 536 eflags = context->sc_eflags; 537 if (!EFL_SECURE(eflags, regs->tf_rflags)) 538 return(EINVAL); 539 540 /* 541 * Don't allow users to load a valid privileged %cs. Let the 542 * hardware check for invalid selectors, excess privilege in 543 * other selectors, invalid %eip's and invalid %esp's. 544 */ 545 if (!CS_SECURE(context->sc_cs)) { 546 ksiginfo_init_trap(&ksi); 547 ksi.ksi_signo = SIGBUS; 548 ksi.ksi_code = BUS_OBJERR; 549 ksi.ksi_trapno = T_PROTFLT; 550 ksi.ksi_addr = (void *)regs->tf_rip; 551 trapsignal(td, &ksi); 552 return(EINVAL); 553 } 554 555 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 556 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 557 558 /* 559 * Restore signal context 560 */ 561 regs->tf_gs = context->sc_gs; 562 regs->tf_fs = context->sc_fs; 563 regs->tf_es = context->sc_es; 564 regs->tf_ds = context->sc_ds; 565 regs->tf_rdi = context->sc_edi; 566 regs->tf_rsi = context->sc_esi; 567 regs->tf_rbp = context->sc_ebp; 568 regs->tf_rbx = context->sc_ebx; 569 regs->tf_rdx = context->sc_edx; 570 regs->tf_rcx = context->sc_ecx; 571 regs->tf_rax = context->sc_eax; 572 regs->tf_rip = context->sc_eip; 573 regs->tf_cs = context->sc_cs; 574 regs->tf_rflags = eflags; 575 regs->tf_rsp = context->sc_esp_at_signal; 576 regs->tf_ss = context->sc_ss; 577 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 578 579 /* 580 * call sigaltstack & ignore results.. 581 */ 582 lss = &uc.uc_stack; 583 ss.ss_sp = PTRIN(lss->ss_sp); 584 ss.ss_size = lss->ss_size; 585 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 586 587 (void)kern_sigaltstack(td, &ss, NULL); 588 589 return (EJUSTRETURN); 590 } 591 592 static int 593 linux32_fetch_syscall_args(struct thread *td) 594 { 595 struct proc *p; 596 struct trapframe *frame; 597 struct syscall_args *sa; 598 599 p = td->td_proc; 600 frame = td->td_frame; 601 sa = &td->td_sa; 602 603 sa->args[0] = frame->tf_rbx; 604 sa->args[1] = frame->tf_rcx; 605 sa->args[2] = frame->tf_rdx; 606 sa->args[3] = frame->tf_rsi; 607 sa->args[4] = frame->tf_rdi; 608 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 609 sa->code = frame->tf_rax; 610 sa->original_code = sa->code; 611 612 if (sa->code >= p->p_sysent->sv_size) 613 /* nosys */ 614 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 615 else 616 sa->callp = &p->p_sysent->sv_table[sa->code]; 617 618 td->td_retval[0] = 0; 619 td->td_retval[1] = frame->tf_rdx; 620 621 return (0); 622 } 623 624 static void 625 linux32_set_syscall_retval(struct thread *td, int error) 626 { 627 struct trapframe *frame = td->td_frame; 628 629 cpu_set_syscall_retval(td, error); 630 631 if (__predict_false(error != 0)) { 632 if (error != ERESTART && error != EJUSTRETURN) 633 frame->tf_rax = bsd_to_linux_errno(error); 634 } 635 } 636 637 static void 638 linux32_set_fork_retval(struct thread *td) 639 { 640 struct trapframe *frame = td->td_frame; 641 642 frame->tf_rax = 0; 643 } 644 645 /* 646 * Clear registers on exec 647 * XXX copied from ia32_signal.c. 648 */ 649 static void 650 linux_exec_setregs(struct thread *td, struct image_params *imgp, 651 uintptr_t stack) 652 { 653 struct trapframe *regs = td->td_frame; 654 struct pcb *pcb = td->td_pcb; 655 register_t saved_rflags; 656 657 regs = td->td_frame; 658 pcb = td->td_pcb; 659 660 if (td->td_proc->p_md.md_ldt != NULL) 661 user_ldt_free(td); 662 663 critical_enter(); 664 wrmsr(MSR_FSBASE, 0); 665 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 666 pcb->pcb_fsbase = 0; 667 pcb->pcb_gsbase = 0; 668 critical_exit(); 669 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 670 671 saved_rflags = regs->tf_rflags & PSL_T; 672 bzero((char *)regs, sizeof(struct trapframe)); 673 regs->tf_rip = imgp->entry_addr; 674 regs->tf_rsp = stack; 675 regs->tf_rflags = PSL_USER | saved_rflags; 676 regs->tf_gs = _ugssel; 677 regs->tf_fs = _ufssel; 678 regs->tf_es = _udatasel; 679 regs->tf_ds = _udatasel; 680 regs->tf_ss = _udatasel; 681 regs->tf_flags = TF_HASSEGS; 682 regs->tf_cs = _ucode32sel; 683 regs->tf_rbx = (register_t)imgp->ps_strings; 684 685 x86_clear_dbregs(pcb); 686 687 fpstate_drop(td); 688 689 /* Do full restore on return so that we can change to a different %cs */ 690 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 691 } 692 693 /* 694 * XXX copied from ia32_sysvec.c. 695 */ 696 static int 697 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 698 { 699 int argc, envc, error; 700 u_int32_t *vectp; 701 char *stringp; 702 uintptr_t destp, ustringp; 703 struct linux32_ps_strings *arginfo; 704 char canary[LINUX_AT_RANDOM_LEN]; 705 size_t execpath_len; 706 707 arginfo = (struct linux32_ps_strings *)PROC_PS_STRINGS(imgp->proc); 708 destp = (uintptr_t)arginfo; 709 710 if (imgp->execpath != NULL && imgp->auxargs != NULL) { 711 execpath_len = strlen(imgp->execpath) + 1; 712 destp -= execpath_len; 713 destp = rounddown2(destp, sizeof(uint32_t)); 714 imgp->execpathp = (void *)destp; 715 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 716 if (error != 0) 717 return (error); 718 } 719 720 /* Prepare the canary for SSP. */ 721 arc4rand(canary, sizeof(canary), 0); 722 destp -= roundup(sizeof(canary), sizeof(uint32_t)); 723 imgp->canary = (void *)destp; 724 error = copyout(canary, imgp->canary, sizeof(canary)); 725 if (error != 0) 726 return (error); 727 728 /* Allocate room for the argument and environment strings. */ 729 destp -= ARG_MAX - imgp->args->stringspace; 730 destp = rounddown2(destp, sizeof(uint32_t)); 731 ustringp = destp; 732 733 if (imgp->auxargs) { 734 /* 735 * Allocate room on the stack for the ELF auxargs 736 * array. It has LINUX_AT_COUNT entries. 737 */ 738 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 739 destp = rounddown2(destp, sizeof(uint32_t)); 740 } 741 742 vectp = (uint32_t *)destp; 743 744 /* 745 * Allocate room for the argv[] and env vectors including the 746 * terminating NULL pointers. 747 */ 748 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 749 750 /* vectp also becomes our initial stack base. */ 751 *stack_base = (uintptr_t)vectp; 752 753 stringp = imgp->args->begin_argv; 754 argc = imgp->args->argc; 755 envc = imgp->args->envc; 756 757 /* Copy out strings - arguments and environment. */ 758 error = copyout(stringp, (void *)ustringp, 759 ARG_MAX - imgp->args->stringspace); 760 if (error != 0) 761 return (error); 762 763 /* Fill in "ps_strings" struct for ps, w, etc. */ 764 if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || 765 suword32(&arginfo->ps_nargvstr, argc) != 0) 766 return (EFAULT); 767 768 /* Fill in argument portion of vector table. */ 769 for (; argc > 0; --argc) { 770 if (suword32(vectp++, ustringp) != 0) 771 return (EFAULT); 772 while (*stringp++ != 0) 773 ustringp++; 774 ustringp++; 775 } 776 777 /* A null vector table pointer separates the argp's from the envp's. */ 778 if (suword32(vectp++, 0) != 0) 779 return (EFAULT); 780 781 if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || 782 suword32(&arginfo->ps_nenvstr, envc) != 0) 783 return (EFAULT); 784 785 /* Fill in environment portion of vector table. */ 786 for (; envc > 0; --envc) { 787 if (suword32(vectp++, ustringp) != 0) 788 return (EFAULT); 789 while (*stringp++ != 0) 790 ustringp++; 791 ustringp++; 792 } 793 794 /* The end of the vector table is a null pointer. */ 795 if (suword32(vectp, 0) != 0) 796 return (EFAULT); 797 798 if (imgp->auxargs) { 799 vectp++; 800 error = imgp->sysent->sv_copyout_auxargs(imgp, 801 (uintptr_t)vectp); 802 if (error != 0) 803 return (error); 804 } 805 806 return (0); 807 } 808 809 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 810 "32-bit Linux emulation"); 811 812 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 813 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 814 &linux32_maxdsiz, 0, ""); 815 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 816 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 817 &linux32_maxssiz, 0, ""); 818 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 819 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 820 &linux32_maxvmem, 0, ""); 821 bool linux32_emulate_i386 = false; 822 SYSCTL_BOOL(_compat_linux32, OID_AUTO, emulate_i386, CTLFLAG_RWTUN, 823 &linux32_emulate_i386, 0, "Emulate the real i386"); 824 825 static void 826 linux32_fixlimit(struct rlimit *rl, int which) 827 { 828 829 switch (which) { 830 case RLIMIT_DATA: 831 if (linux32_maxdsiz != 0) { 832 if (rl->rlim_cur > linux32_maxdsiz) 833 rl->rlim_cur = linux32_maxdsiz; 834 if (rl->rlim_max > linux32_maxdsiz) 835 rl->rlim_max = linux32_maxdsiz; 836 } 837 break; 838 case RLIMIT_STACK: 839 if (linux32_maxssiz != 0) { 840 if (rl->rlim_cur > linux32_maxssiz) 841 rl->rlim_cur = linux32_maxssiz; 842 if (rl->rlim_max > linux32_maxssiz) 843 rl->rlim_max = linux32_maxssiz; 844 } 845 break; 846 case RLIMIT_VMEM: 847 if (linux32_maxvmem != 0) { 848 if (rl->rlim_cur > linux32_maxvmem) 849 rl->rlim_cur = linux32_maxvmem; 850 if (rl->rlim_max > linux32_maxvmem) 851 rl->rlim_max = linux32_maxvmem; 852 } 853 break; 854 } 855 } 856 857 struct sysentvec elf_linux_sysvec = { 858 .sv_size = LINUX32_SYS_MAXSYSCALL, 859 .sv_table = linux32_sysent, 860 .sv_fixup = linux_fixup_elf, 861 .sv_sendsig = linux_sendsig, 862 .sv_sigcode = &_binary_linux32_vdso_so_o_start, 863 .sv_szsigcode = &linux_szsigcode, 864 .sv_name = "Linux ELF32", 865 .sv_coredump = elf32_coredump, 866 .sv_elf_core_osabi = ELFOSABI_NONE, 867 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 868 .sv_elf_core_prepare_notes = linux32_prepare_notes, 869 .sv_imgact_try = linux_exec_imgact_try, 870 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 871 .sv_minuser = VM_MIN_ADDRESS, 872 .sv_maxuser = LINUX32_MAXUSER, 873 .sv_usrstack = LINUX32_USRSTACK, 874 .sv_psstrings = LINUX32_PS_STRINGS, 875 .sv_psstringssz = sizeof(struct linux32_ps_strings), 876 .sv_stackprot = VM_PROT_ALL, 877 .sv_copyout_auxargs = linux_copyout_auxargs, 878 .sv_copyout_strings = linux_copyout_strings, 879 .sv_setregs = linux_exec_setregs, 880 .sv_fixlimit = linux32_fixlimit, 881 .sv_maxssiz = &linux32_maxssiz, 882 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | 883 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 884 .sv_set_syscall_retval = linux32_set_syscall_retval, 885 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 886 .sv_syscallnames = linux32_syscallnames, 887 .sv_shared_page_base = LINUX32_SHAREDPAGE, 888 .sv_shared_page_len = PAGE_SIZE, 889 .sv_schedtail = linux_schedtail, 890 .sv_thread_detach = linux_thread_detach, 891 .sv_trap = NULL, 892 .sv_onexec = linux_on_exec_vmspace, 893 .sv_onexit = linux_on_exit, 894 .sv_ontdexit = linux_thread_dtor, 895 .sv_setid_allowed = &linux_setid_allowed_query, 896 .sv_set_fork_retval = linux32_set_fork_retval, 897 }; 898 899 static int 900 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 901 { 902 int error; 903 904 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 905 LINUX32_VDSOPAGE_SIZE, imgp); 906 if (error == 0) 907 linux_on_exec(p, imgp); 908 return (error); 909 } 910 911 /* 912 * linux_vdso_install() and linux_exec_sysvec_init() must be called 913 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 914 */ 915 static void 916 linux_exec_sysvec_init(void *param) 917 { 918 l_uintptr_t *ktimekeep_base, *ktsc_selector; 919 struct sysentvec *sv; 920 ptrdiff_t tkoff; 921 922 sv = param; 923 /* Fill timekeep_base */ 924 exec_sysvec_init(sv); 925 926 tkoff = kern_timekeep_base - linux_vdso_base; 927 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 928 *ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset; 929 930 tkoff = kern_tsc_selector - linux_vdso_base; 931 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 932 *ktsc_selector = linux_vdso_tsc_selector_idx(); 933 if (bootverbose) 934 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 935 936 tkoff = kern_cpu_selector - linux_vdso_base; 937 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 938 *ktsc_selector = linux_vdso_cpu_selector_idx(); 939 if (bootverbose) 940 printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector); 941 } 942 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 943 linux_exec_sysvec_init, &elf_linux_sysvec); 944 945 static void 946 linux_vdso_install(const void *param) 947 { 948 char *vdso_start = &_binary_linux32_vdso_so_o_start; 949 char *vdso_end = &_binary_linux32_vdso_so_o_end; 950 951 linux_szsigcode = vdso_end - vdso_start; 952 MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE); 953 954 linux_vdso_base = LINUX32_VDSOPAGE; 955 956 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 957 958 linux_vdso_obj = __elfN(linux_shared_page_init) 959 (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 960 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 961 962 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 963 } 964 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 965 linux_vdso_install, NULL); 966 967 static void 968 linux_vdso_deinstall(const void *param) 969 { 970 971 __elfN(linux_shared_page_fini)(linux_vdso_obj, 972 linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 973 } 974 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 975 linux_vdso_deinstall, NULL); 976 977 static void 978 linux_vdso_reloc(char *mapping, Elf_Addr offset) 979 { 980 const Elf_Shdr *shdr; 981 const Elf_Rel *rel; 982 const Elf_Ehdr *ehdr; 983 Elf32_Addr *where; 984 Elf_Size rtype, symidx; 985 Elf32_Addr addr, addend; 986 int i, relcnt; 987 988 MPASS(offset != 0); 989 990 relcnt = 0; 991 ehdr = (const Elf_Ehdr *)mapping; 992 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 993 for (i = 0; i < ehdr->e_shnum; i++) 994 { 995 switch (shdr[i].sh_type) { 996 case SHT_REL: 997 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 998 relcnt = shdr[i].sh_size / sizeof(*rel); 999 break; 1000 case SHT_RELA: 1001 printf("Linux i386 vDSO: unexpected Rela section\n"); 1002 break; 1003 } 1004 } 1005 1006 for (i = 0; i < relcnt; i++, rel++) { 1007 where = (Elf32_Addr *)(mapping + rel->r_offset); 1008 addend = *where; 1009 rtype = ELF_R_TYPE(rel->r_info); 1010 symidx = ELF_R_SYM(rel->r_info); 1011 1012 switch (rtype) { 1013 case R_386_NONE: /* none */ 1014 break; 1015 1016 case R_386_RELATIVE: /* B + A */ 1017 addr = (Elf32_Addr)PTROUT(offset + addend); 1018 if (*where != addr) 1019 *where = addr; 1020 break; 1021 1022 case R_386_IRELATIVE: 1023 printf("Linux i386 vDSO: unexpected ifunc relocation, " 1024 "symbol index %ld\n", (intmax_t)symidx); 1025 break; 1026 default: 1027 printf("Linux i386 vDSO: unexpected relocation type %ld, " 1028 "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx); 1029 } 1030 } 1031 } 1032 1033 static char GNU_ABI_VENDOR[] = "GNU"; 1034 static int GNULINUX_ABI_DESC = 0; 1035 1036 static bool 1037 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1038 { 1039 const Elf32_Word *desc; 1040 uintptr_t p; 1041 1042 p = (uintptr_t)(note + 1); 1043 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1044 1045 desc = (const Elf32_Word *)p; 1046 if (desc[0] != GNULINUX_ABI_DESC) 1047 return (false); 1048 1049 /* 1050 * For Linux we encode osrel using the Linux convention of 1051 * (version << 16) | (major << 8) | (minor) 1052 * See macro in linux_mib.h 1053 */ 1054 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1055 1056 return (true); 1057 } 1058 1059 static Elf_Brandnote linux32_brandnote = { 1060 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1061 .hdr.n_descsz = 16, /* XXX at least 16 */ 1062 .hdr.n_type = 1, 1063 .vendor = GNU_ABI_VENDOR, 1064 .flags = BN_TRANSLATE_OSREL, 1065 .trans_osrel = linux32_trans_osrel 1066 }; 1067 1068 static Elf32_Brandinfo linux_brand = { 1069 .brand = ELFOSABI_LINUX, 1070 .machine = EM_386, 1071 .compat_3_brand = "Linux", 1072 .emul_path = linux_emul_path, 1073 .interp_path = "/lib/ld-linux.so.1", 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_glibc2brand = { 1081 .brand = ELFOSABI_LINUX, 1082 .machine = EM_386, 1083 .compat_3_brand = "Linux", 1084 .emul_path = linux_emul_path, 1085 .interp_path = "/lib/ld-linux.so.2", 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 static Elf32_Brandinfo linux_muslbrand = { 1093 .brand = ELFOSABI_LINUX, 1094 .machine = EM_386, 1095 .compat_3_brand = "Linux", 1096 .emul_path = linux_emul_path, 1097 .interp_path = "/lib/ld-musl-i386.so.1", 1098 .sysvec = &elf_linux_sysvec, 1099 .interp_newpath = NULL, 1100 .brand_note = &linux32_brandnote, 1101 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1102 LINUX_BI_FUTEX_REQUEUE 1103 }; 1104 1105 Elf32_Brandinfo *linux_brandlist[] = { 1106 &linux_brand, 1107 &linux_glibc2brand, 1108 &linux_muslbrand, 1109 NULL 1110 }; 1111 1112 static int 1113 linux_elf_modevent(module_t mod, int type, void *data) 1114 { 1115 Elf32_Brandinfo **brandinfo; 1116 int error; 1117 struct linux_ioctl_handler **lihp; 1118 1119 error = 0; 1120 1121 switch(type) { 1122 case MOD_LOAD: 1123 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1124 ++brandinfo) 1125 if (elf32_insert_brand_entry(*brandinfo) < 0) 1126 error = EINVAL; 1127 if (error == 0) { 1128 SET_FOREACH(lihp, linux_ioctl_handler_set) 1129 linux32_ioctl_register_handler(*lihp); 1130 stclohz = (stathz ? stathz : hz); 1131 if (bootverbose) 1132 printf("Linux i386 ELF exec handler installed\n"); 1133 } else 1134 printf("cannot insert Linux i386 ELF brand handler\n"); 1135 break; 1136 case MOD_UNLOAD: 1137 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1138 ++brandinfo) 1139 if (elf32_brand_inuse(*brandinfo)) 1140 error = EBUSY; 1141 if (error == 0) { 1142 for (brandinfo = &linux_brandlist[0]; 1143 *brandinfo != NULL; ++brandinfo) 1144 if (elf32_remove_brand_entry(*brandinfo) < 0) 1145 error = EINVAL; 1146 } 1147 if (error == 0) { 1148 SET_FOREACH(lihp, linux_ioctl_handler_set) 1149 linux32_ioctl_unregister_handler(*lihp); 1150 if (bootverbose) 1151 printf("Linux i386 ELF exec handler removed\n"); 1152 } else 1153 printf("Could not deinstall Linux i386 ELF interpreter entry\n"); 1154 break; 1155 default: 1156 return (EOPNOTSUPP); 1157 } 1158 return (error); 1159 } 1160 1161 static moduledata_t linux_elf_mod = { 1162 "linuxelf", 1163 linux_elf_modevent, 1164 0 1165 }; 1166 1167 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1168 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1169 FEATURE(linux, "Linux 32bit support");
Cache object: b86cc3e6a6942b1e5e7f272cea45698e
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