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_ioctl.h> 87 #include <compat/linux/linux_mib.h> 88 #include <compat/linux/linux_misc.h> 89 #include <compat/linux/linux_signal.h> 90 #include <compat/linux/linux_util.h> 91 #include <compat/linux/linux_vdso.h> 92 93 MODULE_VERSION(linux, 1); 94 95 #define LINUX32_MAXUSER ((1ul << 32) - PAGE_SIZE) 96 #define LINUX32_VDSOPAGE_SIZE PAGE_SIZE * 2 97 #define LINUX32_VDSOPAGE (LINUX32_MAXUSER - LINUX32_VDSOPAGE_SIZE) 98 #define LINUX32_SHAREDPAGE (LINUX32_VDSOPAGE - PAGE_SIZE) 99 /* 100 * PAGE_SIZE - the size 101 * of the native SHAREDPAGE 102 */ 103 #define LINUX32_USRSTACK LINUX32_SHAREDPAGE 104 105 static int linux_szsigcode; 106 static vm_object_t linux_vdso_obj; 107 static char *linux_vdso_mapping; 108 extern char _binary_linux32_vdso_so_o_start; 109 extern char _binary_linux32_vdso_so_o_end; 110 static vm_offset_t linux_vdso_base; 111 112 extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL]; 113 114 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 115 116 static int linux_fixup_elf(uintptr_t *stack_base, 117 struct image_params *iparams); 118 static int linux_copyout_strings(struct image_params *imgp, 119 uintptr_t *stack_base); 120 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 121 static void linux_exec_setregs(struct thread *td, 122 struct image_params *imgp, uintptr_t stack); 123 static void linux_exec_sysvec_init(void *param); 124 static int linux_on_exec_vmspace(struct proc *p, 125 struct image_params *imgp); 126 static void linux32_fixlimit(struct rlimit *rl, int which); 127 static bool linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 128 static void linux_vdso_install(const void *param); 129 static void linux_vdso_deinstall(const void *param); 130 static void linux_vdso_reloc(char *mapping, Elf_Addr offset); 131 static void linux32_set_fork_retval(struct thread *td); 132 static void linux32_set_syscall_retval(struct thread *td, int error); 133 134 #define LINUX_T_UNKNOWN 255 135 static int _bsd_to_linux_trapcode[] = { 136 LINUX_T_UNKNOWN, /* 0 */ 137 6, /* 1 T_PRIVINFLT */ 138 LINUX_T_UNKNOWN, /* 2 */ 139 3, /* 3 T_BPTFLT */ 140 LINUX_T_UNKNOWN, /* 4 */ 141 LINUX_T_UNKNOWN, /* 5 */ 142 16, /* 6 T_ARITHTRAP */ 143 254, /* 7 T_ASTFLT */ 144 LINUX_T_UNKNOWN, /* 8 */ 145 13, /* 9 T_PROTFLT */ 146 1, /* 10 T_TRCTRAP */ 147 LINUX_T_UNKNOWN, /* 11 */ 148 14, /* 12 T_PAGEFLT */ 149 LINUX_T_UNKNOWN, /* 13 */ 150 17, /* 14 T_ALIGNFLT */ 151 LINUX_T_UNKNOWN, /* 15 */ 152 LINUX_T_UNKNOWN, /* 16 */ 153 LINUX_T_UNKNOWN, /* 17 */ 154 0, /* 18 T_DIVIDE */ 155 2, /* 19 T_NMI */ 156 4, /* 20 T_OFLOW */ 157 5, /* 21 T_BOUND */ 158 7, /* 22 T_DNA */ 159 8, /* 23 T_DOUBLEFLT */ 160 9, /* 24 T_FPOPFLT */ 161 10, /* 25 T_TSSFLT */ 162 11, /* 26 T_SEGNPFLT */ 163 12, /* 27 T_STKFLT */ 164 18, /* 28 T_MCHK */ 165 19, /* 29 T_XMMFLT */ 166 15 /* 30 T_RESERVED */ 167 }; 168 #define bsd_to_linux_trapcode(code) \ 169 ((code)<nitems(_bsd_to_linux_trapcode)? \ 170 _bsd_to_linux_trapcode[(code)]: \ 171 LINUX_T_UNKNOWN) 172 173 struct linux32_ps_strings { 174 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 175 u_int ps_nargvstr; /* the number of argument strings */ 176 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 177 u_int ps_nenvstr; /* the number of environment strings */ 178 }; 179 #define LINUX32_PS_STRINGS (LINUX32_USRSTACK - \ 180 sizeof(struct linux32_ps_strings)) 181 182 LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall); 183 LINUX_VDSO_SYM_INTPTR(__kernel_sigreturn); 184 LINUX_VDSO_SYM_INTPTR(__kernel_rt_sigreturn); 185 LINUX_VDSO_SYM_INTPTR(kern_timekeep_base); 186 LINUX_VDSO_SYM_INTPTR(kern_tsc_selector); 187 LINUX_VDSO_SYM_CHAR(linux_platform); 188 189 /* 190 * If FreeBSD & Linux have a difference of opinion about what a trap 191 * means, deal with it here. 192 * 193 * MPSAFE 194 */ 195 static int 196 linux_translate_traps(int signal, int trap_code) 197 { 198 if (signal != SIGBUS) 199 return (signal); 200 switch (trap_code) { 201 case T_PROTFLT: 202 case T_TSSFLT: 203 case T_DOUBLEFLT: 204 case T_PAGEFLT: 205 return (SIGSEGV); 206 default: 207 return (signal); 208 } 209 } 210 211 static int 212 linux_copyout_auxargs(struct image_params *imgp, uintptr_t base) 213 { 214 Elf32_Auxargs *args; 215 Elf32_Auxinfo *argarray, *pos; 216 int error, issetugid; 217 218 args = (Elf32_Auxargs *)imgp->auxargs; 219 argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP, 220 M_WAITOK | M_ZERO); 221 222 issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0; 223 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall); 224 AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base); 225 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature); 226 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz); 227 228 /* 229 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 230 * as it has appeared in the 2.4.0-rc7 first time. 231 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 232 * glibc falls back to the hard-coded CLK_TCK value when aux entry 233 * is not present. 234 * Also see linux_times() implementation. 235 */ 236 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 237 AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz); 238 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr); 239 AUXARGS_ENTRY(pos, AT_PHENT, args->phent); 240 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum); 241 AUXARGS_ENTRY(pos, AT_BASE, args->base); 242 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags); 243 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry); 244 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 245 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 246 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 247 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 248 AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid); 249 AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary)); 250 AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0); 251 if (imgp->execpathp != 0) 252 AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp)); 253 if (args->execfd != -1) 254 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd); 255 AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform)); 256 AUXARGS_ENTRY(pos, AT_NULL, 0); 257 258 free(imgp->auxargs, M_TEMP); 259 imgp->auxargs = NULL; 260 KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs")); 261 262 error = copyout(argarray, (void *)base, 263 sizeof(*argarray) * LINUX_AT_COUNT); 264 free(argarray, M_TEMP); 265 return (error); 266 } 267 268 static int 269 linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp) 270 { 271 Elf32_Addr *base; 272 273 base = (Elf32_Addr *)*stack_base; 274 base--; 275 if (suword32(base, (uint32_t)imgp->args->argc) == -1) 276 return (EFAULT); 277 *stack_base = (uintptr_t)base; 278 return (0); 279 } 280 281 static void 282 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 283 { 284 struct thread *td = curthread; 285 struct proc *p = td->td_proc; 286 struct sigacts *psp; 287 struct trapframe *regs; 288 struct l_rt_sigframe *fp, frame; 289 int oonstack; 290 int sig; 291 int code; 292 293 sig = ksi->ksi_signo; 294 code = ksi->ksi_code; 295 PROC_LOCK_ASSERT(p, MA_OWNED); 296 psp = p->p_sigacts; 297 mtx_assert(&psp->ps_mtx, MA_OWNED); 298 regs = td->td_frame; 299 oonstack = sigonstack(regs->tf_rsp); 300 301 /* Allocate space for the signal handler context. */ 302 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 303 SIGISMEMBER(psp->ps_sigonstack, sig)) { 304 fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 305 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 306 } else 307 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 308 mtx_unlock(&psp->ps_mtx); 309 310 /* Build the argument list for the signal handler. */ 311 sig = bsd_to_linux_signal(sig); 312 313 bzero(&frame, sizeof(frame)); 314 315 frame.sf_handler = PTROUT(catcher); 316 frame.sf_sig = sig; 317 frame.sf_siginfo = PTROUT(&fp->sf_si); 318 frame.sf_ucontext = PTROUT(&fp->sf_sc); 319 320 /* Fill in POSIX parts. */ 321 siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig); 322 323 /* 324 * Build the signal context to be used by sigreturn and libgcc unwind. 325 */ 326 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 327 frame.sf_sc.uc_link = 0; /* XXX ??? */ 328 329 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 330 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 331 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 332 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 333 PROC_UNLOCK(p); 334 335 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 336 337 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__mask; 338 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 339 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 340 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 341 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 342 frame.sf_sc.uc_mcontext.sc_esp = regs->tf_rsp; 343 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 344 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 345 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 346 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 347 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 348 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 349 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 350 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 351 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 352 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 353 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 354 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 355 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 356 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 357 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 358 359 if (copyout(&frame, fp, sizeof(frame)) != 0) { 360 /* 361 * Process has trashed its stack; give it an illegal 362 * instruction to halt it in its tracks. 363 */ 364 PROC_LOCK(p); 365 sigexit(td, SIGILL); 366 } 367 368 /* Build context to run handler in. */ 369 regs->tf_rsp = PTROUT(fp); 370 regs->tf_rip = __kernel_rt_sigreturn; 371 regs->tf_rflags &= ~(PSL_T | PSL_D); 372 regs->tf_cs = _ucode32sel; 373 regs->tf_ss = _udatasel; 374 regs->tf_ds = _udatasel; 375 regs->tf_es = _udatasel; 376 regs->tf_fs = _ufssel; 377 regs->tf_gs = _ugssel; 378 regs->tf_flags = TF_HASSEGS; 379 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 380 PROC_LOCK(p); 381 mtx_lock(&psp->ps_mtx); 382 } 383 384 /* 385 * Send an interrupt to process. 386 * 387 * Stack is set up to allow sigcode stored 388 * in u. to call routine, followed by kcall 389 * to sigreturn routine below. After sigreturn 390 * resets the signal mask, the stack, and the 391 * frame pointer, it returns to the user 392 * specified pc, psl. 393 */ 394 static void 395 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 396 { 397 struct thread *td = curthread; 398 struct proc *p = td->td_proc; 399 struct sigacts *psp; 400 struct trapframe *regs; 401 struct l_sigframe *fp, frame; 402 l_sigset_t lmask; 403 int oonstack; 404 int sig, code; 405 406 sig = ksi->ksi_signo; 407 code = ksi->ksi_code; 408 PROC_LOCK_ASSERT(p, MA_OWNED); 409 psp = p->p_sigacts; 410 mtx_assert(&psp->ps_mtx, MA_OWNED); 411 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 412 /* Signal handler installed with SA_SIGINFO. */ 413 linux_rt_sendsig(catcher, ksi, mask); 414 return; 415 } 416 417 regs = td->td_frame; 418 oonstack = sigonstack(regs->tf_rsp); 419 420 /* Allocate space for the signal handler context. */ 421 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 422 SIGISMEMBER(psp->ps_sigonstack, sig)) { 423 fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp + 424 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 425 } else 426 fp = (struct l_sigframe *)regs->tf_rsp - 1; 427 mtx_unlock(&psp->ps_mtx); 428 PROC_UNLOCK(p); 429 430 /* Build the argument list for the signal handler. */ 431 sig = bsd_to_linux_signal(sig); 432 433 bzero(&frame, sizeof(frame)); 434 435 frame.sf_handler = PTROUT(catcher); 436 frame.sf_sig = sig; 437 438 bsd_to_linux_sigset(mask, &lmask); 439 440 /* Build the signal context to be used by sigreturn. */ 441 frame.sf_sc.sc_mask = lmask.__mask; 442 frame.sf_sc.sc_gs = regs->tf_gs; 443 frame.sf_sc.sc_fs = regs->tf_fs; 444 frame.sf_sc.sc_es = regs->tf_es; 445 frame.sf_sc.sc_ds = regs->tf_ds; 446 frame.sf_sc.sc_edi = regs->tf_rdi; 447 frame.sf_sc.sc_esi = regs->tf_rsi; 448 frame.sf_sc.sc_ebp = regs->tf_rbp; 449 frame.sf_sc.sc_ebx = regs->tf_rbx; 450 frame.sf_sc.sc_esp = regs->tf_rsp; 451 frame.sf_sc.sc_edx = regs->tf_rdx; 452 frame.sf_sc.sc_ecx = regs->tf_rcx; 453 frame.sf_sc.sc_eax = regs->tf_rax; 454 frame.sf_sc.sc_eip = regs->tf_rip; 455 frame.sf_sc.sc_cs = regs->tf_cs; 456 frame.sf_sc.sc_eflags = regs->tf_rflags; 457 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 458 frame.sf_sc.sc_ss = regs->tf_ss; 459 frame.sf_sc.sc_err = regs->tf_err; 460 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 461 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 462 463 frame.sf_extramask[0] = lmask.__mask; 464 465 if (copyout(&frame, fp, sizeof(frame)) != 0) { 466 /* 467 * Process has trashed its stack; give it an illegal 468 * instruction to halt it in its tracks. 469 */ 470 PROC_LOCK(p); 471 sigexit(td, SIGILL); 472 } 473 474 /* Build context to run handler in. */ 475 regs->tf_rsp = PTROUT(fp); 476 regs->tf_rip = __kernel_sigreturn; 477 regs->tf_rflags &= ~(PSL_T | PSL_D); 478 regs->tf_cs = _ucode32sel; 479 regs->tf_ss = _udatasel; 480 regs->tf_ds = _udatasel; 481 regs->tf_es = _udatasel; 482 regs->tf_fs = _ufssel; 483 regs->tf_gs = _ugssel; 484 regs->tf_flags = TF_HASSEGS; 485 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 486 PROC_LOCK(p); 487 mtx_lock(&psp->ps_mtx); 488 } 489 490 /* 491 * System call to cleanup state after a signal 492 * has been taken. Reset signal mask and 493 * stack state from context left by sendsig (above). 494 * Return to previous pc and psl as specified by 495 * context left by sendsig. Check carefully to 496 * make sure that the user has not modified the 497 * psl to gain improper privileges or to cause 498 * a machine fault. 499 */ 500 int 501 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 502 { 503 struct l_sigframe frame; 504 struct trapframe *regs; 505 sigset_t bmask; 506 l_sigset_t lmask; 507 int eflags; 508 ksiginfo_t ksi; 509 510 regs = td->td_frame; 511 512 /* 513 * The trampoline code hands us the sigframe. 514 * It is unsafe to keep track of it ourselves, in the event that a 515 * program jumps out of a signal handler. 516 */ 517 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 518 return (EFAULT); 519 520 /* Check for security violations. */ 521 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 522 eflags = frame.sf_sc.sc_eflags; 523 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 524 return(EINVAL); 525 526 /* 527 * Don't allow users to load a valid privileged %cs. Let the 528 * hardware check for invalid selectors, excess privilege in 529 * other selectors, invalid %eip's and invalid %esp's. 530 */ 531 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 532 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 533 ksiginfo_init_trap(&ksi); 534 ksi.ksi_signo = SIGBUS; 535 ksi.ksi_code = BUS_OBJERR; 536 ksi.ksi_trapno = T_PROTFLT; 537 ksi.ksi_addr = (void *)regs->tf_rip; 538 trapsignal(td, &ksi); 539 return(EINVAL); 540 } 541 542 lmask.__mask = frame.sf_sc.sc_mask; 543 lmask.__mask = frame.sf_extramask[0]; 544 linux_to_bsd_sigset(&lmask, &bmask); 545 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 546 547 /* Restore signal context. */ 548 regs->tf_rdi = frame.sf_sc.sc_edi; 549 regs->tf_rsi = frame.sf_sc.sc_esi; 550 regs->tf_rbp = frame.sf_sc.sc_ebp; 551 regs->tf_rbx = frame.sf_sc.sc_ebx; 552 regs->tf_rdx = frame.sf_sc.sc_edx; 553 regs->tf_rcx = frame.sf_sc.sc_ecx; 554 regs->tf_rax = frame.sf_sc.sc_eax; 555 regs->tf_rip = frame.sf_sc.sc_eip; 556 regs->tf_cs = frame.sf_sc.sc_cs; 557 regs->tf_ds = frame.sf_sc.sc_ds; 558 regs->tf_es = frame.sf_sc.sc_es; 559 regs->tf_fs = frame.sf_sc.sc_fs; 560 regs->tf_gs = frame.sf_sc.sc_gs; 561 regs->tf_rflags = eflags; 562 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 563 regs->tf_ss = frame.sf_sc.sc_ss; 564 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 565 566 return (EJUSTRETURN); 567 } 568 569 /* 570 * System call to cleanup state after a signal 571 * has been taken. Reset signal mask and 572 * stack state from context left by rt_sendsig (above). 573 * Return to previous pc and psl as specified by 574 * context left by sendsig. Check carefully to 575 * make sure that the user has not modified the 576 * psl to gain improper privileges or to cause 577 * a machine fault. 578 */ 579 int 580 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 581 { 582 struct l_ucontext uc; 583 struct l_sigcontext *context; 584 sigset_t bmask; 585 l_stack_t *lss; 586 stack_t ss; 587 struct trapframe *regs; 588 int eflags; 589 ksiginfo_t ksi; 590 591 regs = td->td_frame; 592 593 /* 594 * The trampoline code hands us the ucontext. 595 * It is unsafe to keep track of it ourselves, in the event that a 596 * program jumps out of a signal handler. 597 */ 598 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 599 return (EFAULT); 600 601 context = &uc.uc_mcontext; 602 603 /* Check for security violations. */ 604 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 605 eflags = context->sc_eflags; 606 if (!EFLAGS_SECURE(eflags, regs->tf_rflags)) 607 return(EINVAL); 608 609 /* 610 * Don't allow users to load a valid privileged %cs. Let the 611 * hardware check for invalid selectors, excess privilege in 612 * other selectors, invalid %eip's and invalid %esp's. 613 */ 614 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 615 if (!CS_SECURE(context->sc_cs)) { 616 ksiginfo_init_trap(&ksi); 617 ksi.ksi_signo = SIGBUS; 618 ksi.ksi_code = BUS_OBJERR; 619 ksi.ksi_trapno = T_PROTFLT; 620 ksi.ksi_addr = (void *)regs->tf_rip; 621 trapsignal(td, &ksi); 622 return(EINVAL); 623 } 624 625 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 626 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 627 628 /* 629 * Restore signal context 630 */ 631 regs->tf_gs = context->sc_gs; 632 regs->tf_fs = context->sc_fs; 633 regs->tf_es = context->sc_es; 634 regs->tf_ds = context->sc_ds; 635 regs->tf_rdi = context->sc_edi; 636 regs->tf_rsi = context->sc_esi; 637 regs->tf_rbp = context->sc_ebp; 638 regs->tf_rbx = context->sc_ebx; 639 regs->tf_rdx = context->sc_edx; 640 regs->tf_rcx = context->sc_ecx; 641 regs->tf_rax = context->sc_eax; 642 regs->tf_rip = context->sc_eip; 643 regs->tf_cs = context->sc_cs; 644 regs->tf_rflags = eflags; 645 regs->tf_rsp = context->sc_esp_at_signal; 646 regs->tf_ss = context->sc_ss; 647 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 648 649 /* 650 * call sigaltstack & ignore results.. 651 */ 652 lss = &uc.uc_stack; 653 ss.ss_sp = PTRIN(lss->ss_sp); 654 ss.ss_size = lss->ss_size; 655 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 656 657 (void)kern_sigaltstack(td, &ss, NULL); 658 659 return (EJUSTRETURN); 660 } 661 662 static int 663 linux32_fetch_syscall_args(struct thread *td) 664 { 665 struct proc *p; 666 struct trapframe *frame; 667 struct syscall_args *sa; 668 669 p = td->td_proc; 670 frame = td->td_frame; 671 sa = &td->td_sa; 672 673 sa->args[0] = frame->tf_rbx; 674 sa->args[1] = frame->tf_rcx; 675 sa->args[2] = frame->tf_rdx; 676 sa->args[3] = frame->tf_rsi; 677 sa->args[4] = frame->tf_rdi; 678 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 679 sa->code = frame->tf_rax; 680 sa->original_code = sa->code; 681 682 if (sa->code >= p->p_sysent->sv_size) 683 /* nosys */ 684 sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1]; 685 else 686 sa->callp = &p->p_sysent->sv_table[sa->code]; 687 688 td->td_retval[0] = 0; 689 td->td_retval[1] = frame->tf_rdx; 690 691 return (0); 692 } 693 694 static void 695 linux32_set_syscall_retval(struct thread *td, int error) 696 { 697 struct trapframe *frame = td->td_frame; 698 699 cpu_set_syscall_retval(td, error); 700 701 if (__predict_false(error != 0)) { 702 if (error != ERESTART && error != EJUSTRETURN) 703 frame->tf_rax = bsd_to_linux_errno(error); 704 } 705 } 706 707 static void 708 linux32_set_fork_retval(struct thread *td) 709 { 710 struct trapframe *frame = td->td_frame; 711 712 frame->tf_rax = 0; 713 } 714 715 /* 716 * Clear registers on exec 717 * XXX copied from ia32_signal.c. 718 */ 719 static void 720 linux_exec_setregs(struct thread *td, struct image_params *imgp, 721 uintptr_t stack) 722 { 723 struct trapframe *regs = td->td_frame; 724 struct pcb *pcb = td->td_pcb; 725 register_t saved_rflags; 726 727 regs = td->td_frame; 728 pcb = td->td_pcb; 729 730 if (td->td_proc->p_md.md_ldt != NULL) 731 user_ldt_free(td); 732 733 critical_enter(); 734 wrmsr(MSR_FSBASE, 0); 735 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 736 pcb->pcb_fsbase = 0; 737 pcb->pcb_gsbase = 0; 738 critical_exit(); 739 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 740 741 saved_rflags = regs->tf_rflags & PSL_T; 742 bzero((char *)regs, sizeof(struct trapframe)); 743 regs->tf_rip = imgp->entry_addr; 744 regs->tf_rsp = stack; 745 regs->tf_rflags = PSL_USER | saved_rflags; 746 regs->tf_gs = _ugssel; 747 regs->tf_fs = _ufssel; 748 regs->tf_es = _udatasel; 749 regs->tf_ds = _udatasel; 750 regs->tf_ss = _udatasel; 751 regs->tf_flags = TF_HASSEGS; 752 regs->tf_cs = _ucode32sel; 753 regs->tf_rbx = (register_t)imgp->ps_strings; 754 755 x86_clear_dbregs(pcb); 756 757 fpstate_drop(td); 758 759 /* Do full restore on return so that we can change to a different %cs */ 760 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 761 } 762 763 /* 764 * XXX copied from ia32_sysvec.c. 765 */ 766 static int 767 linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base) 768 { 769 int argc, envc, error; 770 u_int32_t *vectp; 771 char *stringp; 772 uintptr_t destp, ustringp; 773 struct linux32_ps_strings *arginfo; 774 char canary[LINUX_AT_RANDOM_LEN]; 775 size_t execpath_len; 776 777 /* Calculate string base and vector table pointers. */ 778 if (imgp->execpath != NULL && imgp->auxargs != NULL) 779 execpath_len = strlen(imgp->execpath) + 1; 780 else 781 execpath_len = 0; 782 783 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 784 destp = (uintptr_t)arginfo; 785 786 if (execpath_len != 0) { 787 destp -= execpath_len; 788 destp = rounddown2(destp, sizeof(uint32_t)); 789 imgp->execpathp = (void *)destp; 790 error = copyout(imgp->execpath, imgp->execpathp, execpath_len); 791 if (error != 0) 792 return (error); 793 } 794 795 /* Prepare the canary for SSP. */ 796 arc4rand(canary, sizeof(canary), 0); 797 destp -= roundup(sizeof(canary), sizeof(uint32_t)); 798 imgp->canary = (void *)destp; 799 error = copyout(canary, imgp->canary, sizeof(canary)); 800 if (error != 0) 801 return (error); 802 803 /* Allocate room for the argument and environment strings. */ 804 destp -= ARG_MAX - imgp->args->stringspace; 805 destp = rounddown2(destp, sizeof(uint32_t)); 806 ustringp = destp; 807 808 if (imgp->auxargs) { 809 /* 810 * Allocate room on the stack for the ELF auxargs 811 * array. It has LINUX_AT_COUNT entries. 812 */ 813 destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo); 814 destp = rounddown2(destp, sizeof(uint32_t)); 815 } 816 817 vectp = (uint32_t *)destp; 818 819 /* 820 * Allocate room for the argv[] and env vectors including the 821 * terminating NULL pointers. 822 */ 823 vectp -= imgp->args->argc + 1 + imgp->args->envc + 1; 824 825 /* vectp also becomes our initial stack base. */ 826 *stack_base = (uintptr_t)vectp; 827 828 stringp = imgp->args->begin_argv; 829 argc = imgp->args->argc; 830 envc = imgp->args->envc; 831 832 /* Copy out strings - arguments and environment. */ 833 error = copyout(stringp, (void *)ustringp, 834 ARG_MAX - imgp->args->stringspace); 835 if (error != 0) 836 return (error); 837 838 /* Fill in "ps_strings" struct for ps, w, etc. */ 839 if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 || 840 suword32(&arginfo->ps_nargvstr, argc) != 0) 841 return (EFAULT); 842 843 /* Fill in argument portion of vector table. */ 844 for (; argc > 0; --argc) { 845 if (suword32(vectp++, ustringp) != 0) 846 return (EFAULT); 847 while (*stringp++ != 0) 848 ustringp++; 849 ustringp++; 850 } 851 852 /* A null vector table pointer separates the argp's from the envp's. */ 853 if (suword32(vectp++, 0) != 0) 854 return (EFAULT); 855 856 if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 || 857 suword32(&arginfo->ps_nenvstr, envc) != 0) 858 return (EFAULT); 859 860 /* Fill in environment portion of vector table. */ 861 for (; envc > 0; --envc) { 862 if (suword32(vectp++, ustringp) != 0) 863 return (EFAULT); 864 while (*stringp++ != 0) 865 ustringp++; 866 ustringp++; 867 } 868 869 /* The end of the vector table is a null pointer. */ 870 if (suword32(vectp, 0) != 0) 871 return (EFAULT); 872 873 if (imgp->auxargs) { 874 vectp++; 875 error = imgp->sysent->sv_copyout_auxargs(imgp, 876 (uintptr_t)vectp); 877 if (error != 0) 878 return (error); 879 } 880 881 return (0); 882 } 883 884 static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 885 "32-bit Linux emulation"); 886 887 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 888 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 889 &linux32_maxdsiz, 0, ""); 890 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 891 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 892 &linux32_maxssiz, 0, ""); 893 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 894 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 895 &linux32_maxvmem, 0, ""); 896 897 static void 898 linux32_fixlimit(struct rlimit *rl, int which) 899 { 900 901 switch (which) { 902 case RLIMIT_DATA: 903 if (linux32_maxdsiz != 0) { 904 if (rl->rlim_cur > linux32_maxdsiz) 905 rl->rlim_cur = linux32_maxdsiz; 906 if (rl->rlim_max > linux32_maxdsiz) 907 rl->rlim_max = linux32_maxdsiz; 908 } 909 break; 910 case RLIMIT_STACK: 911 if (linux32_maxssiz != 0) { 912 if (rl->rlim_cur > linux32_maxssiz) 913 rl->rlim_cur = linux32_maxssiz; 914 if (rl->rlim_max > linux32_maxssiz) 915 rl->rlim_max = linux32_maxssiz; 916 } 917 break; 918 case RLIMIT_VMEM: 919 if (linux32_maxvmem != 0) { 920 if (rl->rlim_cur > linux32_maxvmem) 921 rl->rlim_cur = linux32_maxvmem; 922 if (rl->rlim_max > linux32_maxvmem) 923 rl->rlim_max = linux32_maxvmem; 924 } 925 break; 926 } 927 } 928 929 struct sysentvec elf_linux_sysvec = { 930 .sv_size = LINUX32_SYS_MAXSYSCALL, 931 .sv_table = linux32_sysent, 932 .sv_transtrap = linux_translate_traps, 933 .sv_fixup = linux_fixup_elf, 934 .sv_sendsig = linux_sendsig, 935 .sv_sigcode = &_binary_linux32_vdso_so_o_start, 936 .sv_szsigcode = &linux_szsigcode, 937 .sv_name = "Linux ELF32", 938 .sv_coredump = elf32_coredump, 939 .sv_elf_core_osabi = ELFOSABI_NONE, 940 .sv_elf_core_abi_vendor = LINUX_ABI_VENDOR, 941 .sv_elf_core_prepare_notes = linux32_prepare_notes, 942 .sv_imgact_try = linux_exec_imgact_try, 943 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 944 .sv_minuser = VM_MIN_ADDRESS, 945 .sv_maxuser = LINUX32_MAXUSER, 946 .sv_usrstack = LINUX32_USRSTACK, 947 .sv_psstrings = LINUX32_PS_STRINGS, 948 .sv_stackprot = VM_PROT_ALL, 949 .sv_copyout_auxargs = linux_copyout_auxargs, 950 .sv_copyout_strings = linux_copyout_strings, 951 .sv_setregs = linux_exec_setregs, 952 .sv_fixlimit = linux32_fixlimit, 953 .sv_maxssiz = &linux32_maxssiz, 954 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP | 955 SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP, 956 .sv_set_syscall_retval = linux32_set_syscall_retval, 957 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 958 .sv_syscallnames = NULL, 959 .sv_shared_page_base = LINUX32_SHAREDPAGE, 960 .sv_shared_page_len = PAGE_SIZE, 961 .sv_schedtail = linux_schedtail, 962 .sv_thread_detach = linux_thread_detach, 963 .sv_trap = NULL, 964 .sv_onexec = linux_on_exec_vmspace, 965 .sv_onexit = linux_on_exit, 966 .sv_ontdexit = linux_thread_dtor, 967 .sv_setid_allowed = &linux_setid_allowed_query, 968 .sv_set_fork_retval = linux32_set_fork_retval, 969 }; 970 971 static int 972 linux_on_exec_vmspace(struct proc *p, struct image_params *imgp) 973 { 974 int error; 975 976 error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base, 977 LINUX32_VDSOPAGE_SIZE, imgp); 978 if (error == 0) 979 linux_on_exec(p, imgp); 980 return (error); 981 } 982 983 /* 984 * linux_vdso_install() and linux_exec_sysvec_init() must be called 985 * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY). 986 */ 987 static void 988 linux_exec_sysvec_init(void *param) 989 { 990 l_uintptr_t *ktimekeep_base, *ktsc_selector; 991 struct sysentvec *sv; 992 ptrdiff_t tkoff; 993 994 sv = param; 995 /* Fill timekeep_base */ 996 exec_sysvec_init(sv); 997 998 tkoff = kern_timekeep_base - linux_vdso_base; 999 ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 1000 *ktimekeep_base = sv->sv_timekeep_base; 1001 1002 tkoff = kern_tsc_selector - linux_vdso_base; 1003 ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff); 1004 *ktsc_selector = linux_vdso_tsc_selector_idx(); 1005 if (bootverbose) 1006 printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector); 1007 } 1008 SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY, 1009 linux_exec_sysvec_init, &elf_linux_sysvec); 1010 1011 static void 1012 linux_vdso_install(const void *param) 1013 { 1014 char *vdso_start = &_binary_linux32_vdso_so_o_start; 1015 char *vdso_end = &_binary_linux32_vdso_so_o_end; 1016 1017 linux_szsigcode = vdso_end - vdso_start; 1018 MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE); 1019 1020 linux_vdso_base = LINUX32_VDSOPAGE; 1021 1022 __elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base); 1023 1024 linux_vdso_obj = __elfN(linux_shared_page_init) 1025 (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 1026 bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode); 1027 1028 linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base); 1029 } 1030 SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST, 1031 linux_vdso_install, NULL); 1032 1033 static void 1034 linux_vdso_deinstall(const void *param) 1035 { 1036 1037 __elfN(linux_shared_page_fini)(linux_vdso_obj, 1038 linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE); 1039 } 1040 SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST, 1041 linux_vdso_deinstall, NULL); 1042 1043 static void 1044 linux_vdso_reloc(char *mapping, Elf_Addr offset) 1045 { 1046 const Elf_Shdr *shdr; 1047 const Elf_Rel *rel; 1048 const Elf_Ehdr *ehdr; 1049 Elf32_Addr *where; 1050 Elf_Size rtype, symidx; 1051 Elf32_Addr addr, addend; 1052 int i, relcnt; 1053 1054 MPASS(offset != 0); 1055 1056 relcnt = 0; 1057 ehdr = (const Elf_Ehdr *)mapping; 1058 shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff); 1059 for (i = 0; i < ehdr->e_shnum; i++) 1060 { 1061 switch (shdr[i].sh_type) { 1062 case SHT_REL: 1063 rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset); 1064 relcnt = shdr[i].sh_size / sizeof(*rel); 1065 break; 1066 case SHT_RELA: 1067 printf("Linux i386 vDSO: unexpected Rela section\n"); 1068 break; 1069 } 1070 } 1071 1072 for (i = 0; i < relcnt; i++, rel++) { 1073 where = (Elf32_Addr *)(mapping + rel->r_offset); 1074 addend = *where; 1075 rtype = ELF_R_TYPE(rel->r_info); 1076 symidx = ELF_R_SYM(rel->r_info); 1077 1078 switch (rtype) { 1079 case R_386_NONE: /* none */ 1080 break; 1081 1082 case R_386_RELATIVE: /* B + A */ 1083 addr = (Elf32_Addr)PTROUT(offset + addend); 1084 if (*where != addr) 1085 *where = addr; 1086 break; 1087 1088 case R_386_IRELATIVE: 1089 printf("Linux i386 vDSO: unexpected ifunc relocation, " 1090 "symbol index %ld\n", (intmax_t)symidx); 1091 break; 1092 default: 1093 printf("Linux i386 vDSO: unexpected relocation type %ld, " 1094 "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx); 1095 } 1096 } 1097 } 1098 1099 static char GNU_ABI_VENDOR[] = "GNU"; 1100 static int GNULINUX_ABI_DESC = 0; 1101 1102 static bool 1103 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1104 { 1105 const Elf32_Word *desc; 1106 uintptr_t p; 1107 1108 p = (uintptr_t)(note + 1); 1109 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1110 1111 desc = (const Elf32_Word *)p; 1112 if (desc[0] != GNULINUX_ABI_DESC) 1113 return (false); 1114 1115 /* 1116 * For Linux we encode osrel using the Linux convention of 1117 * (version << 16) | (major << 8) | (minor) 1118 * See macro in linux_mib.h 1119 */ 1120 *osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]); 1121 1122 return (true); 1123 } 1124 1125 static Elf_Brandnote linux32_brandnote = { 1126 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1127 .hdr.n_descsz = 16, /* XXX at least 16 */ 1128 .hdr.n_type = 1, 1129 .vendor = GNU_ABI_VENDOR, 1130 .flags = BN_TRANSLATE_OSREL, 1131 .trans_osrel = linux32_trans_osrel 1132 }; 1133 1134 static Elf32_Brandinfo linux_brand = { 1135 .brand = ELFOSABI_LINUX, 1136 .machine = EM_386, 1137 .compat_3_brand = "Linux", 1138 .emul_path = linux_emul_path, 1139 .interp_path = "/lib/ld-linux.so.1", 1140 .sysvec = &elf_linux_sysvec, 1141 .interp_newpath = NULL, 1142 .brand_note = &linux32_brandnote, 1143 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1144 }; 1145 1146 static Elf32_Brandinfo linux_glibc2brand = { 1147 .brand = ELFOSABI_LINUX, 1148 .machine = EM_386, 1149 .compat_3_brand = "Linux", 1150 .emul_path = linux_emul_path, 1151 .interp_path = "/lib/ld-linux.so.2", 1152 .sysvec = &elf_linux_sysvec, 1153 .interp_newpath = NULL, 1154 .brand_note = &linux32_brandnote, 1155 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1156 }; 1157 1158 static Elf32_Brandinfo linux_muslbrand = { 1159 .brand = ELFOSABI_LINUX, 1160 .machine = EM_386, 1161 .compat_3_brand = "Linux", 1162 .emul_path = linux_emul_path, 1163 .interp_path = "/lib/ld-musl-i386.so.1", 1164 .sysvec = &elf_linux_sysvec, 1165 .interp_newpath = NULL, 1166 .brand_note = &linux32_brandnote, 1167 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE | 1168 LINUX_BI_FUTEX_REQUEUE 1169 }; 1170 1171 Elf32_Brandinfo *linux_brandlist[] = { 1172 &linux_brand, 1173 &linux_glibc2brand, 1174 &linux_muslbrand, 1175 NULL 1176 }; 1177 1178 static int 1179 linux_elf_modevent(module_t mod, int type, void *data) 1180 { 1181 Elf32_Brandinfo **brandinfo; 1182 int error; 1183 struct linux_ioctl_handler **lihp; 1184 1185 error = 0; 1186 1187 switch(type) { 1188 case MOD_LOAD: 1189 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1190 ++brandinfo) 1191 if (elf32_insert_brand_entry(*brandinfo) < 0) 1192 error = EINVAL; 1193 if (error == 0) { 1194 SET_FOREACH(lihp, linux_ioctl_handler_set) 1195 linux32_ioctl_register_handler(*lihp); 1196 stclohz = (stathz ? stathz : hz); 1197 if (bootverbose) 1198 printf("Linux i386 ELF exec handler installed\n"); 1199 } else 1200 printf("cannot insert Linux i386 ELF brand handler\n"); 1201 break; 1202 case MOD_UNLOAD: 1203 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1204 ++brandinfo) 1205 if (elf32_brand_inuse(*brandinfo)) 1206 error = EBUSY; 1207 if (error == 0) { 1208 for (brandinfo = &linux_brandlist[0]; 1209 *brandinfo != NULL; ++brandinfo) 1210 if (elf32_remove_brand_entry(*brandinfo) < 0) 1211 error = EINVAL; 1212 } 1213 if (error == 0) { 1214 SET_FOREACH(lihp, linux_ioctl_handler_set) 1215 linux32_ioctl_unregister_handler(*lihp); 1216 if (bootverbose) 1217 printf("Linux i386 ELF exec handler removed\n"); 1218 } else 1219 printf("Could not deinstall Linux i386 ELF interpreter entry\n"); 1220 break; 1221 default: 1222 return (EOPNOTSUPP); 1223 } 1224 return (error); 1225 } 1226 1227 static moduledata_t linux_elf_mod = { 1228 "linuxelf", 1229 linux_elf_modevent, 1230 0 1231 }; 1232 1233 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1234 MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1); 1235 FEATURE(linux, "Linux 32bit support"); 1236