1 /*- 2 * Copyright (c) 2004 Tim J. Robbins 3 * Copyright (c) 2003 Peter Wemm 4 * Copyright (c) 2002 Doug Rabson 5 * Copyright (c) 1998-1999 Andrew Gallatin 6 * Copyright (c) 1994-1996 S�ren Schmidt 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer 14 * in this position and unchanged. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 #include "opt_compat.h" 36 37 #ifndef COMPAT_FREEBSD32 38 #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!" 39 #endif 40 41 #define __ELF_WORD_SIZE 32 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/exec.h> 46 #include <sys/fcntl.h> 47 #include <sys/imgact.h> 48 #include <sys/imgact_elf.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/module.h> 53 #include <sys/mutex.h> 54 #include <sys/proc.h> 55 #include <sys/resourcevar.h> 56 #include <sys/signalvar.h> 57 #include <sys/sysctl.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysent.h> 60 #include <sys/sysproto.h> 61 #include <sys/vnode.h> 62 #include <sys/eventhandler.h> 63 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 #include <vm/vm_extern.h> 67 #include <vm/vm_map.h> 68 #include <vm/vm_object.h> 69 #include <vm/vm_page.h> 70 #include <vm/vm_param.h> 71 72 #include <machine/cpu.h> 73 #include <machine/md_var.h> 74 #include <machine/pcb.h> 75 #include <machine/specialreg.h> 76 77 #include <amd64/linux32/linux.h> 78 #include <amd64/linux32/linux32_proto.h> 79 #include <compat/linux/linux_futex.h> 80 #include <compat/linux/linux_emul.h> 81 #include <compat/linux/linux_mib.h> 82 #include <compat/linux/linux_misc.h> 83 #include <compat/linux/linux_signal.h> 84 #include <compat/linux/linux_util.h> 85 86 MODULE_VERSION(linux, 1); 87 88 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 89 90 #define AUXARGS_ENTRY_32(pos, id, val) \ 91 do { \ 92 suword32(pos++, id); \ 93 suword32(pos++, val); \ 94 } while (0) 95 96 #if BYTE_ORDER == LITTLE_ENDIAN 97 #define SHELLMAGIC 0x2123 /* #! */ 98 #else 99 #define SHELLMAGIC 0x2321 100 #endif 101 102 /* 103 * Allow the sendsig functions to use the ldebug() facility 104 * even though they are not syscalls themselves. Map them 105 * to syscall 0. This is slightly less bogus than using 106 * ldebug(sigreturn). 107 */ 108 #define LINUX_SYS_linux_rt_sendsig 0 109 #define LINUX_SYS_linux_sendsig 0 110 111 const char *linux_platform = "i686"; 112 static int linux_szplatform; 113 extern char linux_sigcode[]; 114 extern int linux_szsigcode; 115 116 extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL]; 117 118 SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler); 119 SET_DECLARE(linux_device_handler_set, struct linux_device_handler); 120 121 static int elf_linux_fixup(register_t **stack_base, 122 struct image_params *iparams); 123 static register_t *linux_copyout_strings(struct image_params *imgp); 124 static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask); 125 static void exec_linux_setregs(struct thread *td, 126 struct image_params *imgp, u_long stack); 127 static void linux32_fixlimit(struct rlimit *rl, int which); 128 static boolean_t linux32_trans_osrel(const Elf_Note *note, int32_t *osrel); 129 130 static eventhandler_tag linux_exit_tag; 131 static eventhandler_tag linux_schedtail_tag; 132 static eventhandler_tag linux_exec_tag; 133 134 /* 135 * Linux syscalls return negative errno's, we do positive and map them 136 * Reference: 137 * FreeBSD: src/sys/sys/errno.h 138 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 139 * linux-2.6.17.8/include/asm-generic/errno.h 140 */ 141 static int bsd_to_linux_errno[ELAST + 1] = { 142 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 143 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 144 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 145 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 146 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 147 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 148 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 149 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 150 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 151 -72, -67, -71 152 }; 153 154 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 155 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 156 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 157 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 158 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 159 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 160 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 161 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 162 0, LINUX_SIGUSR1, LINUX_SIGUSR2 163 }; 164 165 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 166 SIGHUP, SIGINT, SIGQUIT, SIGILL, 167 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 168 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 169 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 170 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 171 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 172 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 173 SIGIO, SIGURG, SIGSYS 174 }; 175 176 #define LINUX_T_UNKNOWN 255 177 static int _bsd_to_linux_trapcode[] = { 178 LINUX_T_UNKNOWN, /* 0 */ 179 6, /* 1 T_PRIVINFLT */ 180 LINUX_T_UNKNOWN, /* 2 */ 181 3, /* 3 T_BPTFLT */ 182 LINUX_T_UNKNOWN, /* 4 */ 183 LINUX_T_UNKNOWN, /* 5 */ 184 16, /* 6 T_ARITHTRAP */ 185 254, /* 7 T_ASTFLT */ 186 LINUX_T_UNKNOWN, /* 8 */ 187 13, /* 9 T_PROTFLT */ 188 1, /* 10 T_TRCTRAP */ 189 LINUX_T_UNKNOWN, /* 11 */ 190 14, /* 12 T_PAGEFLT */ 191 LINUX_T_UNKNOWN, /* 13 */ 192 17, /* 14 T_ALIGNFLT */ 193 LINUX_T_UNKNOWN, /* 15 */ 194 LINUX_T_UNKNOWN, /* 16 */ 195 LINUX_T_UNKNOWN, /* 17 */ 196 0, /* 18 T_DIVIDE */ 197 2, /* 19 T_NMI */ 198 4, /* 20 T_OFLOW */ 199 5, /* 21 T_BOUND */ 200 7, /* 22 T_DNA */ 201 8, /* 23 T_DOUBLEFLT */ 202 9, /* 24 T_FPOPFLT */ 203 10, /* 25 T_TSSFLT */ 204 11, /* 26 T_SEGNPFLT */ 205 12, /* 27 T_STKFLT */ 206 18, /* 28 T_MCHK */ 207 19, /* 29 T_XMMFLT */ 208 15 /* 30 T_RESERVED */ 209 }; 210 #define bsd_to_linux_trapcode(code) \ 211 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 212 _bsd_to_linux_trapcode[(code)]: \ 213 LINUX_T_UNKNOWN) 214 215 struct linux32_ps_strings { 216 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 217 u_int ps_nargvstr; /* the number of argument strings */ 218 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 219 u_int ps_nenvstr; /* the number of environment strings */ 220 }; 221 222 /* 223 * If FreeBSD & Linux have a difference of opinion about what a trap 224 * means, deal with it here. 225 * 226 * MPSAFE 227 */ 228 static int 229 translate_traps(int signal, int trap_code) 230 { 231 if (signal != SIGBUS) 232 return signal; 233 switch (trap_code) { 234 case T_PROTFLT: 235 case T_TSSFLT: 236 case T_DOUBLEFLT: 237 case T_PAGEFLT: 238 return SIGSEGV; 239 default: 240 return signal; 241 } 242 } 243 244 static int 245 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 246 { 247 Elf32_Auxargs *args; 248 Elf32_Addr *base; 249 Elf32_Addr *pos, *uplatform; 250 struct linux32_ps_strings *arginfo; 251 252 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 253 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szsigcode - 254 linux_szplatform); 255 256 KASSERT(curthread->td_proc == imgp->proc, 257 ("unsafe elf_linux_fixup(), should be curproc")); 258 base = (Elf32_Addr *)*stack_base; 259 args = (Elf32_Auxargs *)imgp->auxargs; 260 pos = base + (imgp->args->argc + imgp->args->envc + 2); 261 262 AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature); 263 264 /* 265 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 266 * as it has appeared in the 2.4.0-rc7 first time. 267 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 268 * glibc falls back to the hard-coded CLK_TCK value when aux entry 269 * is not present. 270 * Also see linux_times() implementation. 271 */ 272 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 273 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz); 274 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr); 275 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent); 276 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum); 277 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz); 278 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags); 279 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry); 280 AUXARGS_ENTRY_32(pos, AT_BASE, args->base); 281 AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, 0); 282 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 283 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 284 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 285 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 286 AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 287 if (args->execfd != -1) 288 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd); 289 AUXARGS_ENTRY_32(pos, AT_NULL, 0); 290 291 free(imgp->auxargs, M_TEMP); 292 imgp->auxargs = NULL; 293 294 base--; 295 suword32(base, (uint32_t)imgp->args->argc); 296 *stack_base = (register_t *)base; 297 return 0; 298 } 299 300 extern unsigned long linux_sznonrtsigcode; 301 302 static void 303 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 304 { 305 struct thread *td = curthread; 306 struct proc *p = td->td_proc; 307 struct sigacts *psp; 308 struct trapframe *regs; 309 struct l_rt_sigframe *fp, frame; 310 int oonstack; 311 int sig; 312 int code; 313 314 sig = ksi->ksi_signo; 315 code = ksi->ksi_code; 316 PROC_LOCK_ASSERT(p, MA_OWNED); 317 psp = p->p_sigacts; 318 mtx_assert(&psp->ps_mtx, MA_OWNED); 319 regs = td->td_frame; 320 oonstack = sigonstack(regs->tf_rsp); 321 322 #ifdef DEBUG 323 if (ldebug(rt_sendsig)) 324 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 325 catcher, sig, (void*)mask, code); 326 #endif 327 /* 328 * Allocate space for the signal handler context. 329 */ 330 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 331 SIGISMEMBER(psp->ps_sigonstack, sig)) { 332 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 333 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 334 } else 335 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 336 mtx_unlock(&psp->ps_mtx); 337 338 /* 339 * Build the argument list for the signal handler. 340 */ 341 if (p->p_sysent->sv_sigtbl) 342 if (sig <= p->p_sysent->sv_sigsize) 343 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 344 345 bzero(&frame, sizeof(frame)); 346 347 frame.sf_handler = PTROUT(catcher); 348 frame.sf_sig = sig; 349 frame.sf_siginfo = PTROUT(&fp->sf_si); 350 frame.sf_ucontext = PTROUT(&fp->sf_sc); 351 352 /* Fill in POSIX parts */ 353 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 354 355 /* 356 * Build the signal context to be used by sigreturn. 357 */ 358 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 359 frame.sf_sc.uc_link = 0; /* XXX ??? */ 360 361 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 362 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 363 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 364 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 365 PROC_UNLOCK(p); 366 367 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 368 369 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 370 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 371 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 372 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 373 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 374 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 375 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 376 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 377 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 378 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 379 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 380 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 381 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 382 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 383 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 384 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 385 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 386 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 387 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 388 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 389 390 #ifdef DEBUG 391 if (ldebug(rt_sendsig)) 392 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 393 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 394 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 395 #endif 396 397 if (copyout(&frame, fp, sizeof(frame)) != 0) { 398 /* 399 * Process has trashed its stack; give it an illegal 400 * instruction to halt it in its tracks. 401 */ 402 #ifdef DEBUG 403 if (ldebug(rt_sendsig)) 404 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 405 fp, oonstack); 406 #endif 407 PROC_LOCK(p); 408 sigexit(td, SIGILL); 409 } 410 411 /* 412 * Build context to run handler in. 413 */ 414 regs->tf_rsp = PTROUT(fp); 415 regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode) + 416 linux_sznonrtsigcode; 417 regs->tf_rflags &= ~(PSL_T | PSL_D); 418 regs->tf_cs = _ucode32sel; 419 regs->tf_ss = _udatasel; 420 regs->tf_ds = _udatasel; 421 regs->tf_es = _udatasel; 422 regs->tf_fs = _ufssel; 423 regs->tf_gs = _ugssel; 424 regs->tf_flags = TF_HASSEGS; 425 td->td_pcb->pcb_full_iret = 1; 426 PROC_LOCK(p); 427 mtx_lock(&psp->ps_mtx); 428 } 429 430 431 /* 432 * Send an interrupt to process. 433 * 434 * Stack is set up to allow sigcode stored 435 * in u. to call routine, followed by kcall 436 * to sigreturn routine below. After sigreturn 437 * resets the signal mask, the stack, and the 438 * frame pointer, it returns to the user 439 * specified pc, psl. 440 */ 441 static void 442 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 443 { 444 struct thread *td = curthread; 445 struct proc *p = td->td_proc; 446 struct sigacts *psp; 447 struct trapframe *regs; 448 struct l_sigframe *fp, frame; 449 l_sigset_t lmask; 450 int oonstack, i; 451 int sig, code; 452 453 sig = ksi->ksi_signo; 454 code = ksi->ksi_code; 455 PROC_LOCK_ASSERT(p, MA_OWNED); 456 psp = p->p_sigacts; 457 mtx_assert(&psp->ps_mtx, MA_OWNED); 458 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 459 /* Signal handler installed with SA_SIGINFO. */ 460 linux_rt_sendsig(catcher, ksi, mask); 461 return; 462 } 463 464 regs = td->td_frame; 465 oonstack = sigonstack(regs->tf_rsp); 466 467 #ifdef DEBUG 468 if (ldebug(sendsig)) 469 printf(ARGS(sendsig, "%p, %d, %p, %u"), 470 catcher, sig, (void*)mask, code); 471 #endif 472 473 /* 474 * Allocate space for the signal handler context. 475 */ 476 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 477 SIGISMEMBER(psp->ps_sigonstack, sig)) { 478 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 479 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 480 } else 481 fp = (struct l_sigframe *)regs->tf_rsp - 1; 482 mtx_unlock(&psp->ps_mtx); 483 PROC_UNLOCK(p); 484 485 /* 486 * Build the argument list for the signal handler. 487 */ 488 if (p->p_sysent->sv_sigtbl) 489 if (sig <= p->p_sysent->sv_sigsize) 490 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 491 492 bzero(&frame, sizeof(frame)); 493 494 frame.sf_handler = PTROUT(catcher); 495 frame.sf_sig = sig; 496 497 bsd_to_linux_sigset(mask, &lmask); 498 499 /* 500 * Build the signal context to be used by sigreturn. 501 */ 502 frame.sf_sc.sc_mask = lmask.__bits[0]; 503 frame.sf_sc.sc_gs = regs->tf_gs; 504 frame.sf_sc.sc_fs = regs->tf_fs; 505 frame.sf_sc.sc_es = regs->tf_es; 506 frame.sf_sc.sc_ds = regs->tf_ds; 507 frame.sf_sc.sc_edi = regs->tf_rdi; 508 frame.sf_sc.sc_esi = regs->tf_rsi; 509 frame.sf_sc.sc_ebp = regs->tf_rbp; 510 frame.sf_sc.sc_ebx = regs->tf_rbx; 511 frame.sf_sc.sc_edx = regs->tf_rdx; 512 frame.sf_sc.sc_ecx = regs->tf_rcx; 513 frame.sf_sc.sc_eax = regs->tf_rax; 514 frame.sf_sc.sc_eip = regs->tf_rip; 515 frame.sf_sc.sc_cs = regs->tf_cs; 516 frame.sf_sc.sc_eflags = regs->tf_rflags; 517 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 518 frame.sf_sc.sc_ss = regs->tf_ss; 519 frame.sf_sc.sc_err = regs->tf_err; 520 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 521 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 522 523 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 524 frame.sf_extramask[i] = lmask.__bits[i+1]; 525 526 if (copyout(&frame, fp, sizeof(frame)) != 0) { 527 /* 528 * Process has trashed its stack; give it an illegal 529 * instruction to halt it in its tracks. 530 */ 531 PROC_LOCK(p); 532 sigexit(td, SIGILL); 533 } 534 535 /* 536 * Build context to run handler in. 537 */ 538 regs->tf_rsp = PTROUT(fp); 539 regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode); 540 regs->tf_rflags &= ~(PSL_T | PSL_D); 541 regs->tf_cs = _ucode32sel; 542 regs->tf_ss = _udatasel; 543 regs->tf_ds = _udatasel; 544 regs->tf_es = _udatasel; 545 regs->tf_fs = _ufssel; 546 regs->tf_gs = _ugssel; 547 regs->tf_flags = TF_HASSEGS; 548 td->td_pcb->pcb_full_iret = 1; 549 PROC_LOCK(p); 550 mtx_lock(&psp->ps_mtx); 551 } 552 553 /* 554 * System call to cleanup state after a signal 555 * has been taken. Reset signal mask and 556 * stack state from context left by sendsig (above). 557 * Return to previous pc and psl as specified by 558 * context left by sendsig. Check carefully to 559 * make sure that the user has not modified the 560 * psl to gain improper privileges or to cause 561 * a machine fault. 562 */ 563 int 564 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 565 { 566 struct l_sigframe frame; 567 struct trapframe *regs; 568 sigset_t bmask; 569 l_sigset_t lmask; 570 int eflags, i; 571 ksiginfo_t ksi; 572 573 regs = td->td_frame; 574 575 #ifdef DEBUG 576 if (ldebug(sigreturn)) 577 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 578 #endif 579 /* 580 * The trampoline code hands us the sigframe. 581 * It is unsafe to keep track of it ourselves, in the event that a 582 * program jumps out of a signal handler. 583 */ 584 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 585 return (EFAULT); 586 587 /* 588 * Check for security violations. 589 */ 590 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 591 eflags = frame.sf_sc.sc_eflags; 592 /* 593 * XXX do allow users to change the privileged flag PSL_RF. The 594 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 595 * sometimes set it there too. tf_eflags is kept in the signal 596 * context during signal handling and there is no other place 597 * to remember it, so the PSL_RF bit may be corrupted by the 598 * signal handler without us knowing. Corruption of the PSL_RF 599 * bit at worst causes one more or one less debugger trap, so 600 * allowing it is fairly harmless. 601 */ 602 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 603 return(EINVAL); 604 605 /* 606 * Don't allow users to load a valid privileged %cs. Let the 607 * hardware check for invalid selectors, excess privilege in 608 * other selectors, invalid %eip's and invalid %esp's. 609 */ 610 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 611 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 612 ksiginfo_init_trap(&ksi); 613 ksi.ksi_signo = SIGBUS; 614 ksi.ksi_code = BUS_OBJERR; 615 ksi.ksi_trapno = T_PROTFLT; 616 ksi.ksi_addr = (void *)regs->tf_rip; 617 trapsignal(td, &ksi); 618 return(EINVAL); 619 } 620 621 lmask.__bits[0] = frame.sf_sc.sc_mask; 622 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 623 lmask.__bits[i+1] = frame.sf_extramask[i]; 624 linux_to_bsd_sigset(&lmask, &bmask); 625 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 626 627 /* 628 * Restore signal context. 629 */ 630 regs->tf_rdi = frame.sf_sc.sc_edi; 631 regs->tf_rsi = frame.sf_sc.sc_esi; 632 regs->tf_rbp = frame.sf_sc.sc_ebp; 633 regs->tf_rbx = frame.sf_sc.sc_ebx; 634 regs->tf_rdx = frame.sf_sc.sc_edx; 635 regs->tf_rcx = frame.sf_sc.sc_ecx; 636 regs->tf_rax = frame.sf_sc.sc_eax; 637 regs->tf_rip = frame.sf_sc.sc_eip; 638 regs->tf_cs = frame.sf_sc.sc_cs; 639 regs->tf_ds = frame.sf_sc.sc_ds; 640 regs->tf_es = frame.sf_sc.sc_es; 641 regs->tf_fs = frame.sf_sc.sc_fs; 642 regs->tf_gs = frame.sf_sc.sc_gs; 643 regs->tf_rflags = eflags; 644 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 645 regs->tf_ss = frame.sf_sc.sc_ss; 646 td->td_pcb->pcb_full_iret = 1; 647 648 return (EJUSTRETURN); 649 } 650 651 /* 652 * System call to cleanup state after a signal 653 * has been taken. Reset signal mask and 654 * stack state from context left by rt_sendsig (above). 655 * Return to previous pc and psl as specified by 656 * context left by sendsig. Check carefully to 657 * make sure that the user has not modified the 658 * psl to gain improper privileges or to cause 659 * a machine fault. 660 */ 661 int 662 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 663 { 664 struct l_ucontext uc; 665 struct l_sigcontext *context; 666 sigset_t bmask; 667 l_stack_t *lss; 668 stack_t ss; 669 struct trapframe *regs; 670 int eflags; 671 ksiginfo_t ksi; 672 673 regs = td->td_frame; 674 675 #ifdef DEBUG 676 if (ldebug(rt_sigreturn)) 677 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 678 #endif 679 /* 680 * The trampoline code hands us the ucontext. 681 * It is unsafe to keep track of it ourselves, in the event that a 682 * program jumps out of a signal handler. 683 */ 684 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 685 return (EFAULT); 686 687 context = &uc.uc_mcontext; 688 689 /* 690 * Check for security violations. 691 */ 692 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 693 eflags = context->sc_eflags; 694 /* 695 * XXX do allow users to change the privileged flag PSL_RF. The 696 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 697 * sometimes set it there too. tf_eflags is kept in the signal 698 * context during signal handling and there is no other place 699 * to remember it, so the PSL_RF bit may be corrupted by the 700 * signal handler without us knowing. Corruption of the PSL_RF 701 * bit at worst causes one more or one less debugger trap, so 702 * allowing it is fairly harmless. 703 */ 704 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 705 return(EINVAL); 706 707 /* 708 * Don't allow users to load a valid privileged %cs. Let the 709 * hardware check for invalid selectors, excess privilege in 710 * other selectors, invalid %eip's and invalid %esp's. 711 */ 712 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 713 if (!CS_SECURE(context->sc_cs)) { 714 ksiginfo_init_trap(&ksi); 715 ksi.ksi_signo = SIGBUS; 716 ksi.ksi_code = BUS_OBJERR; 717 ksi.ksi_trapno = T_PROTFLT; 718 ksi.ksi_addr = (void *)regs->tf_rip; 719 trapsignal(td, &ksi); 720 return(EINVAL); 721 } 722 723 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 724 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 725 726 /* 727 * Restore signal context 728 */ 729 regs->tf_gs = context->sc_gs; 730 regs->tf_fs = context->sc_fs; 731 regs->tf_es = context->sc_es; 732 regs->tf_ds = context->sc_ds; 733 regs->tf_rdi = context->sc_edi; 734 regs->tf_rsi = context->sc_esi; 735 regs->tf_rbp = context->sc_ebp; 736 regs->tf_rbx = context->sc_ebx; 737 regs->tf_rdx = context->sc_edx; 738 regs->tf_rcx = context->sc_ecx; 739 regs->tf_rax = context->sc_eax; 740 regs->tf_rip = context->sc_eip; 741 regs->tf_cs = context->sc_cs; 742 regs->tf_rflags = eflags; 743 regs->tf_rsp = context->sc_esp_at_signal; 744 regs->tf_ss = context->sc_ss; 745 td->td_pcb->pcb_full_iret = 1; 746 747 /* 748 * call sigaltstack & ignore results.. 749 */ 750 lss = &uc.uc_stack; 751 ss.ss_sp = PTRIN(lss->ss_sp); 752 ss.ss_size = lss->ss_size; 753 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 754 755 #ifdef DEBUG 756 if (ldebug(rt_sigreturn)) 757 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 758 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 759 #endif 760 (void)kern_sigaltstack(td, &ss, NULL); 761 762 return (EJUSTRETURN); 763 } 764 765 static int 766 linux32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 767 { 768 struct proc *p; 769 struct trapframe *frame; 770 771 p = td->td_proc; 772 frame = td->td_frame; 773 774 sa->args[0] = frame->tf_rbx; 775 sa->args[1] = frame->tf_rcx; 776 sa->args[2] = frame->tf_rdx; 777 sa->args[3] = frame->tf_rsi; 778 sa->args[4] = frame->tf_rdi; 779 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 780 sa->code = frame->tf_rax; 781 782 if (sa->code >= p->p_sysent->sv_size) 783 sa->callp = &p->p_sysent->sv_table[0]; 784 else 785 sa->callp = &p->p_sysent->sv_table[sa->code]; 786 sa->narg = sa->callp->sy_narg; 787 788 td->td_retval[0] = 0; 789 td->td_retval[1] = frame->tf_rdx; 790 791 return (0); 792 } 793 794 /* 795 * If a linux binary is exec'ing something, try this image activator 796 * first. We override standard shell script execution in order to 797 * be able to modify the interpreter path. We only do this if a linux 798 * binary is doing the exec, so we do not create an EXEC module for it. 799 */ 800 static int exec_linux_imgact_try(struct image_params *iparams); 801 802 static int 803 exec_linux_imgact_try(struct image_params *imgp) 804 { 805 const char *head = (const char *)imgp->image_header; 806 char *rpath; 807 int error = -1; 808 809 /* 810 * The interpreter for shell scripts run from a linux binary needs 811 * to be located in /compat/linux if possible in order to recursively 812 * maintain linux path emulation. 813 */ 814 if (((const short *)head)[0] == SHELLMAGIC) { 815 /* 816 * Run our normal shell image activator. If it succeeds attempt 817 * to use the alternate path for the interpreter. If an 818 * alternate * path is found, use our stringspace to store it. 819 */ 820 if ((error = exec_shell_imgact(imgp)) == 0) { 821 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 822 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, 823 AT_FDCWD); 824 if (rpath != NULL) 825 imgp->args->fname_buf = 826 imgp->interpreter_name = rpath; 827 } 828 } 829 return (error); 830 } 831 832 /* 833 * Clear registers on exec 834 * XXX copied from ia32_signal.c. 835 */ 836 static void 837 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 838 { 839 struct trapframe *regs = td->td_frame; 840 struct pcb *pcb = td->td_pcb; 841 842 mtx_lock(&dt_lock); 843 if (td->td_proc->p_md.md_ldt != NULL) 844 user_ldt_free(td); 845 else 846 mtx_unlock(&dt_lock); 847 848 critical_enter(); 849 wrmsr(MSR_FSBASE, 0); 850 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 851 pcb->pcb_fsbase = 0; 852 pcb->pcb_gsbase = 0; 853 critical_exit(); 854 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 855 856 bzero((char *)regs, sizeof(struct trapframe)); 857 regs->tf_rip = imgp->entry_addr; 858 regs->tf_rsp = stack; 859 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 860 regs->tf_gs = _ugssel; 861 regs->tf_fs = _ufssel; 862 regs->tf_es = _udatasel; 863 regs->tf_ds = _udatasel; 864 regs->tf_ss = _udatasel; 865 regs->tf_flags = TF_HASSEGS; 866 regs->tf_cs = _ucode32sel; 867 regs->tf_rbx = imgp->ps_strings; 868 td->td_pcb->pcb_full_iret = 1; 869 load_cr0(rcr0() | CR0_MP | CR0_TS); 870 fpstate_drop(td); 871 872 /* Return via doreti so that we can change to a different %cs */ 873 pcb->pcb_flags |= PCB_FULLCTX | PCB_32BIT; 874 pcb->pcb_flags &= ~PCB_GS32BIT; 875 td->td_retval[1] = 0; 876 } 877 878 /* 879 * XXX copied from ia32_sysvec.c. 880 */ 881 static register_t * 882 linux_copyout_strings(struct image_params *imgp) 883 { 884 int argc, envc; 885 u_int32_t *vectp; 886 char *stringp, *destp; 887 u_int32_t *stack_base; 888 struct linux32_ps_strings *arginfo; 889 890 /* 891 * Calculate string base and vector table pointers. 892 * Also deal with signal trampoline code for this exec type. 893 */ 894 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 895 destp = (caddr_t)arginfo - linux_szsigcode - SPARE_USRSPACE - 896 linux_szplatform - roundup((ARG_MAX - imgp->args->stringspace), 897 sizeof(char *)); 898 899 /* 900 * install sigcode 901 */ 902 copyout(imgp->proc->p_sysent->sv_sigcode, 903 ((caddr_t)arginfo - linux_szsigcode), linux_szsigcode); 904 905 /* 906 * Install LINUX_PLATFORM 907 */ 908 copyout(linux_platform, ((caddr_t)arginfo - linux_szsigcode - 909 linux_szplatform), linux_szplatform); 910 911 /* 912 * If we have a valid auxargs ptr, prepare some room 913 * on the stack. 914 */ 915 if (imgp->auxargs) { 916 /* 917 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 918 * lower compatibility. 919 */ 920 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 921 (LINUX_AT_COUNT * 2); 922 /* 923 * The '+ 2' is for the null pointers at the end of each of 924 * the arg and env vector sets,and imgp->auxarg_size is room 925 * for argument of Runtime loader. 926 */ 927 vectp = (u_int32_t *) (destp - (imgp->args->argc + 928 imgp->args->envc + 2 + imgp->auxarg_size) * 929 sizeof(u_int32_t)); 930 931 } else 932 /* 933 * The '+ 2' is for the null pointers at the end of each of 934 * the arg and env vector sets 935 */ 936 vectp = (u_int32_t *)(destp - (imgp->args->argc + 937 imgp->args->envc + 2) * sizeof(u_int32_t)); 938 939 /* 940 * vectp also becomes our initial stack base 941 */ 942 stack_base = vectp; 943 944 stringp = imgp->args->begin_argv; 945 argc = imgp->args->argc; 946 envc = imgp->args->envc; 947 /* 948 * Copy out strings - arguments and environment. 949 */ 950 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 951 952 /* 953 * Fill in "ps_strings" struct for ps, w, etc. 954 */ 955 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 956 suword32(&arginfo->ps_nargvstr, argc); 957 958 /* 959 * Fill in argument portion of vector table. 960 */ 961 for (; argc > 0; --argc) { 962 suword32(vectp++, (uint32_t)(intptr_t)destp); 963 while (*stringp++ != 0) 964 destp++; 965 destp++; 966 } 967 968 /* a null vector table pointer separates the argp's from the envp's */ 969 suword32(vectp++, 0); 970 971 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 972 suword32(&arginfo->ps_nenvstr, envc); 973 974 /* 975 * Fill in environment portion of vector table. 976 */ 977 for (; envc > 0; --envc) { 978 suword32(vectp++, (uint32_t)(intptr_t)destp); 979 while (*stringp++ != 0) 980 destp++; 981 destp++; 982 } 983 984 /* end of vector table is a null pointer */ 985 suword32(vectp, 0); 986 987 return ((register_t *)stack_base); 988 } 989 990 SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 991 "32-bit Linux emulation"); 992 993 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 994 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 995 &linux32_maxdsiz, 0, ""); 996 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 997 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 998 &linux32_maxssiz, 0, ""); 999 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 1000 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 1001 &linux32_maxvmem, 0, ""); 1002 1003 static void 1004 linux32_fixlimit(struct rlimit *rl, int which) 1005 { 1006 1007 switch (which) { 1008 case RLIMIT_DATA: 1009 if (linux32_maxdsiz != 0) { 1010 if (rl->rlim_cur > linux32_maxdsiz) 1011 rl->rlim_cur = linux32_maxdsiz; 1012 if (rl->rlim_max > linux32_maxdsiz) 1013 rl->rlim_max = linux32_maxdsiz; 1014 } 1015 break; 1016 case RLIMIT_STACK: 1017 if (linux32_maxssiz != 0) { 1018 if (rl->rlim_cur > linux32_maxssiz) 1019 rl->rlim_cur = linux32_maxssiz; 1020 if (rl->rlim_max > linux32_maxssiz) 1021 rl->rlim_max = linux32_maxssiz; 1022 } 1023 break; 1024 case RLIMIT_VMEM: 1025 if (linux32_maxvmem != 0) { 1026 if (rl->rlim_cur > linux32_maxvmem) 1027 rl->rlim_cur = linux32_maxvmem; 1028 if (rl->rlim_max > linux32_maxvmem) 1029 rl->rlim_max = linux32_maxvmem; 1030 } 1031 break; 1032 } 1033 } 1034 1035 struct sysentvec elf_linux_sysvec = { 1036 .sv_size = LINUX_SYS_MAXSYSCALL, 1037 .sv_table = linux_sysent, 1038 .sv_mask = 0, 1039 .sv_sigsize = LINUX_SIGTBLSZ, 1040 .sv_sigtbl = bsd_to_linux_signal, 1041 .sv_errsize = ELAST + 1, 1042 .sv_errtbl = bsd_to_linux_errno, 1043 .sv_transtrap = translate_traps, 1044 .sv_fixup = elf_linux_fixup, 1045 .sv_sendsig = linux_sendsig, 1046 .sv_sigcode = linux_sigcode, 1047 .sv_szsigcode = &linux_szsigcode, 1048 .sv_prepsyscall = NULL, 1049 .sv_name = "Linux ELF32", 1050 .sv_coredump = elf32_coredump, 1051 .sv_imgact_try = exec_linux_imgact_try, 1052 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1053 .sv_pagesize = PAGE_SIZE, 1054 .sv_minuser = VM_MIN_ADDRESS, 1055 .sv_maxuser = LINUX32_USRSTACK, 1056 .sv_usrstack = LINUX32_USRSTACK, 1057 .sv_psstrings = LINUX32_PS_STRINGS, 1058 .sv_stackprot = VM_PROT_ALL, 1059 .sv_copyout_strings = linux_copyout_strings, 1060 .sv_setregs = exec_linux_setregs, 1061 .sv_fixlimit = linux32_fixlimit, 1062 .sv_maxssiz = &linux32_maxssiz, 1063 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32, 1064 .sv_set_syscall_retval = cpu_set_syscall_retval, 1065 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 1066 .sv_syscallnames = NULL, 1067 }; 1068 1069 static char GNU_ABI_VENDOR[] = "GNU"; 1070 static int GNULINUX_ABI_DESC = 0; 1071 1072 static boolean_t 1073 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1074 { 1075 const Elf32_Word *desc; 1076 uintptr_t p; 1077 1078 p = (uintptr_t)(note + 1); 1079 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1080 1081 desc = (const Elf32_Word *)p; 1082 if (desc[0] != GNULINUX_ABI_DESC) 1083 return (FALSE); 1084 1085 /* 1086 * For linux we encode osrel as follows (see linux_mib.c): 1087 * VVVMMMIII (version, major, minor), see linux_mib.c. 1088 */ 1089 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1090 1091 return (TRUE); 1092 } 1093 1094 static Elf_Brandnote linux32_brandnote = { 1095 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1096 .hdr.n_descsz = 16, /* XXX at least 16 */ 1097 .hdr.n_type = 1, 1098 .vendor = GNU_ABI_VENDOR, 1099 .flags = BN_TRANSLATE_OSREL, 1100 .trans_osrel = linux32_trans_osrel 1101 }; 1102 1103 static Elf32_Brandinfo linux_brand = { 1104 .brand = ELFOSABI_LINUX, 1105 .machine = EM_386, 1106 .compat_3_brand = "Linux", 1107 .emul_path = "/compat/linux", 1108 .interp_path = "/lib/ld-linux.so.1", 1109 .sysvec = &elf_linux_sysvec, 1110 .interp_newpath = NULL, 1111 .brand_note = &linux32_brandnote, 1112 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1113 }; 1114 1115 static Elf32_Brandinfo linux_glibc2brand = { 1116 .brand = ELFOSABI_LINUX, 1117 .machine = EM_386, 1118 .compat_3_brand = "Linux", 1119 .emul_path = "/compat/linux", 1120 .interp_path = "/lib/ld-linux.so.2", 1121 .sysvec = &elf_linux_sysvec, 1122 .interp_newpath = NULL, 1123 .brand_note = &linux32_brandnote, 1124 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1125 }; 1126 1127 Elf32_Brandinfo *linux_brandlist[] = { 1128 &linux_brand, 1129 &linux_glibc2brand, 1130 NULL 1131 }; 1132 1133 static int 1134 linux_elf_modevent(module_t mod, int type, void *data) 1135 { 1136 Elf32_Brandinfo **brandinfo; 1137 int error; 1138 struct linux_ioctl_handler **lihp; 1139 struct linux_device_handler **ldhp; 1140 1141 error = 0; 1142 1143 switch(type) { 1144 case MOD_LOAD: 1145 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1146 ++brandinfo) 1147 if (elf32_insert_brand_entry(*brandinfo) < 0) 1148 error = EINVAL; 1149 if (error == 0) { 1150 SET_FOREACH(lihp, linux_ioctl_handler_set) 1151 linux_ioctl_register_handler(*lihp); 1152 SET_FOREACH(ldhp, linux_device_handler_set) 1153 linux_device_register_handler(*ldhp); 1154 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1155 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1156 LIST_INIT(&futex_list); 1157 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1158 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, 1159 linux_proc_exit, NULL, 1000); 1160 linux_schedtail_tag = EVENTHANDLER_REGISTER(schedtail, 1161 linux_schedtail, NULL, 1000); 1162 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, 1163 linux_proc_exec, NULL, 1000); 1164 linux_szplatform = roundup(strlen(linux_platform) + 1, 1165 sizeof(char *)); 1166 linux_osd_jail_register(); 1167 stclohz = (stathz ? stathz : hz); 1168 if (bootverbose) 1169 printf("Linux ELF exec handler installed\n"); 1170 } else 1171 printf("cannot insert Linux ELF brand handler\n"); 1172 break; 1173 case MOD_UNLOAD: 1174 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1175 ++brandinfo) 1176 if (elf32_brand_inuse(*brandinfo)) 1177 error = EBUSY; 1178 if (error == 0) { 1179 for (brandinfo = &linux_brandlist[0]; 1180 *brandinfo != NULL; ++brandinfo) 1181 if (elf32_remove_brand_entry(*brandinfo) < 0) 1182 error = EINVAL; 1183 } 1184 if (error == 0) { 1185 SET_FOREACH(lihp, linux_ioctl_handler_set) 1186 linux_ioctl_unregister_handler(*lihp); 1187 SET_FOREACH(ldhp, linux_device_handler_set) 1188 linux_device_unregister_handler(*ldhp); 1189 mtx_destroy(&emul_lock); 1190 sx_destroy(&emul_shared_lock); 1191 mtx_destroy(&futex_mtx); 1192 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1193 EVENTHANDLER_DEREGISTER(schedtail, linux_schedtail_tag); 1194 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1195 linux_osd_jail_deregister(); 1196 if (bootverbose) 1197 printf("Linux ELF exec handler removed\n"); 1198 } else 1199 printf("Could not deinstall ELF interpreter entry\n"); 1200 break; 1201 default: 1202 return EOPNOTSUPP; 1203 } 1204 return error; 1205 } 1206 1207 static moduledata_t linux_elf_mod = { 1208 "linuxelf", 1209 linux_elf_modevent, 1210 0 1211 }; 1212 1213 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY); 1214