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sys/amd64/linux32/linux32_sysvec.c
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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 Søren 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: releng/9.0/sys/amd64/linux32/linux32_sysvec.c 220026 2011-03-26 09:25:35Z dchagin $"); 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_emul.h> 80 #include <compat/linux/linux_futex.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_exec_tag; 132 133 /* 134 * Linux syscalls return negative errno's, we do positive and map them 135 * Reference: 136 * FreeBSD: src/sys/sys/errno.h 137 * Linux: linux-2.6.17.8/include/asm-generic/errno-base.h 138 * linux-2.6.17.8/include/asm-generic/errno.h 139 */ 140 static int bsd_to_linux_errno[ELAST + 1] = { 141 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 142 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, 143 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, 144 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, 145 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, 146 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, 147 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, 148 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, 149 -6, -6, -43, -42, -75,-125, -84, -95, -16, -74, 150 -72, -67, -71 151 }; 152 153 int bsd_to_linux_signal[LINUX_SIGTBLSZ] = { 154 LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL, 155 LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE, 156 LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS, 157 LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG, 158 LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD, 159 LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU, 160 LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH, 161 0, LINUX_SIGUSR1, LINUX_SIGUSR2 162 }; 163 164 int linux_to_bsd_signal[LINUX_SIGTBLSZ] = { 165 SIGHUP, SIGINT, SIGQUIT, SIGILL, 166 SIGTRAP, SIGABRT, SIGBUS, SIGFPE, 167 SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2, 168 SIGPIPE, SIGALRM, SIGTERM, SIGBUS, 169 SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP, 170 SIGTTIN, SIGTTOU, SIGURG, SIGXCPU, 171 SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH, 172 SIGIO, SIGURG, SIGSYS 173 }; 174 175 #define LINUX_T_UNKNOWN 255 176 static int _bsd_to_linux_trapcode[] = { 177 LINUX_T_UNKNOWN, /* 0 */ 178 6, /* 1 T_PRIVINFLT */ 179 LINUX_T_UNKNOWN, /* 2 */ 180 3, /* 3 T_BPTFLT */ 181 LINUX_T_UNKNOWN, /* 4 */ 182 LINUX_T_UNKNOWN, /* 5 */ 183 16, /* 6 T_ARITHTRAP */ 184 254, /* 7 T_ASTFLT */ 185 LINUX_T_UNKNOWN, /* 8 */ 186 13, /* 9 T_PROTFLT */ 187 1, /* 10 T_TRCTRAP */ 188 LINUX_T_UNKNOWN, /* 11 */ 189 14, /* 12 T_PAGEFLT */ 190 LINUX_T_UNKNOWN, /* 13 */ 191 17, /* 14 T_ALIGNFLT */ 192 LINUX_T_UNKNOWN, /* 15 */ 193 LINUX_T_UNKNOWN, /* 16 */ 194 LINUX_T_UNKNOWN, /* 17 */ 195 0, /* 18 T_DIVIDE */ 196 2, /* 19 T_NMI */ 197 4, /* 20 T_OFLOW */ 198 5, /* 21 T_BOUND */ 199 7, /* 22 T_DNA */ 200 8, /* 23 T_DOUBLEFLT */ 201 9, /* 24 T_FPOPFLT */ 202 10, /* 25 T_TSSFLT */ 203 11, /* 26 T_SEGNPFLT */ 204 12, /* 27 T_STKFLT */ 205 18, /* 28 T_MCHK */ 206 19, /* 29 T_XMMFLT */ 207 15 /* 30 T_RESERVED */ 208 }; 209 #define bsd_to_linux_trapcode(code) \ 210 ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \ 211 _bsd_to_linux_trapcode[(code)]: \ 212 LINUX_T_UNKNOWN) 213 214 struct linux32_ps_strings { 215 u_int32_t ps_argvstr; /* first of 0 or more argument strings */ 216 u_int ps_nargvstr; /* the number of argument strings */ 217 u_int32_t ps_envstr; /* first of 0 or more environment strings */ 218 u_int ps_nenvstr; /* the number of environment strings */ 219 }; 220 221 /* 222 * If FreeBSD & Linux have a difference of opinion about what a trap 223 * means, deal with it here. 224 * 225 * MPSAFE 226 */ 227 static int 228 translate_traps(int signal, int trap_code) 229 { 230 if (signal != SIGBUS) 231 return signal; 232 switch (trap_code) { 233 case T_PROTFLT: 234 case T_TSSFLT: 235 case T_DOUBLEFLT: 236 case T_PAGEFLT: 237 return SIGSEGV; 238 default: 239 return signal; 240 } 241 } 242 243 static int 244 elf_linux_fixup(register_t **stack_base, struct image_params *imgp) 245 { 246 Elf32_Auxargs *args; 247 Elf32_Addr *base; 248 Elf32_Addr *pos, *uplatform; 249 struct linux32_ps_strings *arginfo; 250 251 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 252 uplatform = (Elf32_Addr *)((caddr_t)arginfo - linux_szplatform); 253 254 KASSERT(curthread->td_proc == imgp->proc, 255 ("unsafe elf_linux_fixup(), should be curproc")); 256 base = (Elf32_Addr *)*stack_base; 257 args = (Elf32_Auxargs *)imgp->auxargs; 258 pos = base + (imgp->args->argc + imgp->args->envc + 2); 259 260 AUXARGS_ENTRY_32(pos, LINUX_AT_HWCAP, cpu_feature); 261 262 /* 263 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0, 264 * as it has appeared in the 2.4.0-rc7 first time. 265 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK), 266 * glibc falls back to the hard-coded CLK_TCK value when aux entry 267 * is not present. 268 * Also see linux_times() implementation. 269 */ 270 if (linux_kernver(curthread) >= LINUX_KERNVER_2004000) 271 AUXARGS_ENTRY_32(pos, LINUX_AT_CLKTCK, stclohz); 272 AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr); 273 AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent); 274 AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum); 275 AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz); 276 AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags); 277 AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry); 278 AUXARGS_ENTRY_32(pos, AT_BASE, args->base); 279 AUXARGS_ENTRY_32(pos, LINUX_AT_SECURE, 0); 280 AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid); 281 AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid); 282 AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid); 283 AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid); 284 AUXARGS_ENTRY_32(pos, LINUX_AT_PLATFORM, PTROUT(uplatform)); 285 if (args->execfd != -1) 286 AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd); 287 AUXARGS_ENTRY_32(pos, AT_NULL, 0); 288 289 free(imgp->auxargs, M_TEMP); 290 imgp->auxargs = NULL; 291 292 base--; 293 suword32(base, (uint32_t)imgp->args->argc); 294 *stack_base = (register_t *)base; 295 return 0; 296 } 297 298 extern unsigned long linux_sznonrtsigcode; 299 300 static void 301 linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 302 { 303 struct thread *td = curthread; 304 struct proc *p = td->td_proc; 305 struct sigacts *psp; 306 struct trapframe *regs; 307 struct l_rt_sigframe *fp, frame; 308 int oonstack; 309 int sig; 310 int code; 311 312 sig = ksi->ksi_signo; 313 code = ksi->ksi_code; 314 PROC_LOCK_ASSERT(p, MA_OWNED); 315 psp = p->p_sigacts; 316 mtx_assert(&psp->ps_mtx, MA_OWNED); 317 regs = td->td_frame; 318 oonstack = sigonstack(regs->tf_rsp); 319 320 #ifdef DEBUG 321 if (ldebug(rt_sendsig)) 322 printf(ARGS(rt_sendsig, "%p, %d, %p, %u"), 323 catcher, sig, (void*)mask, code); 324 #endif 325 /* 326 * Allocate space for the signal handler context. 327 */ 328 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 329 SIGISMEMBER(psp->ps_sigonstack, sig)) { 330 fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp + 331 td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe)); 332 } else 333 fp = (struct l_rt_sigframe *)regs->tf_rsp - 1; 334 mtx_unlock(&psp->ps_mtx); 335 336 /* 337 * Build the argument list for the signal handler. 338 */ 339 if (p->p_sysent->sv_sigtbl) 340 if (sig <= p->p_sysent->sv_sigsize) 341 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 342 343 bzero(&frame, sizeof(frame)); 344 345 frame.sf_handler = PTROUT(catcher); 346 frame.sf_sig = sig; 347 frame.sf_siginfo = PTROUT(&fp->sf_si); 348 frame.sf_ucontext = PTROUT(&fp->sf_sc); 349 350 /* Fill in POSIX parts */ 351 ksiginfo_to_lsiginfo(ksi, &frame.sf_si, sig); 352 353 /* 354 * Build the signal context to be used by sigreturn. 355 */ 356 frame.sf_sc.uc_flags = 0; /* XXX ??? */ 357 frame.sf_sc.uc_link = 0; /* XXX ??? */ 358 359 frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp); 360 frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size; 361 frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 362 ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE; 363 PROC_UNLOCK(p); 364 365 bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask); 366 367 frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0]; 368 frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi; 369 frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi; 370 frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp; 371 frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx; 372 frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx; 373 frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx; 374 frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax; 375 frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip; 376 frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs; 377 frame.sf_sc.uc_mcontext.sc_gs = regs->tf_gs; 378 frame.sf_sc.uc_mcontext.sc_fs = regs->tf_fs; 379 frame.sf_sc.uc_mcontext.sc_es = regs->tf_es; 380 frame.sf_sc.uc_mcontext.sc_ds = regs->tf_ds; 381 frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags; 382 frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp; 383 frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss; 384 frame.sf_sc.uc_mcontext.sc_err = regs->tf_err; 385 frame.sf_sc.uc_mcontext.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 386 frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code); 387 388 #ifdef DEBUG 389 if (ldebug(rt_sendsig)) 390 printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 391 frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp, 392 td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask); 393 #endif 394 395 if (copyout(&frame, fp, sizeof(frame)) != 0) { 396 /* 397 * Process has trashed its stack; give it an illegal 398 * instruction to halt it in its tracks. 399 */ 400 #ifdef DEBUG 401 if (ldebug(rt_sendsig)) 402 printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"), 403 fp, oonstack); 404 #endif 405 PROC_LOCK(p); 406 sigexit(td, SIGILL); 407 } 408 409 /* 410 * Build context to run handler in. 411 */ 412 regs->tf_rsp = PTROUT(fp); 413 regs->tf_rip = p->p_sysent->sv_sigcode_base + linux_sznonrtsigcode; 414 regs->tf_rflags &= ~(PSL_T | PSL_D); 415 regs->tf_cs = _ucode32sel; 416 regs->tf_ss = _udatasel; 417 regs->tf_ds = _udatasel; 418 regs->tf_es = _udatasel; 419 regs->tf_fs = _ufssel; 420 regs->tf_gs = _ugssel; 421 regs->tf_flags = TF_HASSEGS; 422 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 423 PROC_LOCK(p); 424 mtx_lock(&psp->ps_mtx); 425 } 426 427 428 /* 429 * Send an interrupt to process. 430 * 431 * Stack is set up to allow sigcode stored 432 * in u. to call routine, followed by kcall 433 * to sigreturn routine below. After sigreturn 434 * resets the signal mask, the stack, and the 435 * frame pointer, it returns to the user 436 * specified pc, psl. 437 */ 438 static void 439 linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 440 { 441 struct thread *td = curthread; 442 struct proc *p = td->td_proc; 443 struct sigacts *psp; 444 struct trapframe *regs; 445 struct l_sigframe *fp, frame; 446 l_sigset_t lmask; 447 int oonstack, i; 448 int sig, code; 449 450 sig = ksi->ksi_signo; 451 code = ksi->ksi_code; 452 PROC_LOCK_ASSERT(p, MA_OWNED); 453 psp = p->p_sigacts; 454 mtx_assert(&psp->ps_mtx, MA_OWNED); 455 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 456 /* Signal handler installed with SA_SIGINFO. */ 457 linux_rt_sendsig(catcher, ksi, mask); 458 return; 459 } 460 461 regs = td->td_frame; 462 oonstack = sigonstack(regs->tf_rsp); 463 464 #ifdef DEBUG 465 if (ldebug(sendsig)) 466 printf(ARGS(sendsig, "%p, %d, %p, %u"), 467 catcher, sig, (void*)mask, code); 468 #endif 469 470 /* 471 * Allocate space for the signal handler context. 472 */ 473 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 474 SIGISMEMBER(psp->ps_sigonstack, sig)) { 475 fp = (struct l_sigframe *)(td->td_sigstk.ss_sp + 476 td->td_sigstk.ss_size - sizeof(struct l_sigframe)); 477 } else 478 fp = (struct l_sigframe *)regs->tf_rsp - 1; 479 mtx_unlock(&psp->ps_mtx); 480 PROC_UNLOCK(p); 481 482 /* 483 * Build the argument list for the signal handler. 484 */ 485 if (p->p_sysent->sv_sigtbl) 486 if (sig <= p->p_sysent->sv_sigsize) 487 sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)]; 488 489 bzero(&frame, sizeof(frame)); 490 491 frame.sf_handler = PTROUT(catcher); 492 frame.sf_sig = sig; 493 494 bsd_to_linux_sigset(mask, &lmask); 495 496 /* 497 * Build the signal context to be used by sigreturn. 498 */ 499 frame.sf_sc.sc_mask = lmask.__bits[0]; 500 frame.sf_sc.sc_gs = regs->tf_gs; 501 frame.sf_sc.sc_fs = regs->tf_fs; 502 frame.sf_sc.sc_es = regs->tf_es; 503 frame.sf_sc.sc_ds = regs->tf_ds; 504 frame.sf_sc.sc_edi = regs->tf_rdi; 505 frame.sf_sc.sc_esi = regs->tf_rsi; 506 frame.sf_sc.sc_ebp = regs->tf_rbp; 507 frame.sf_sc.sc_ebx = regs->tf_rbx; 508 frame.sf_sc.sc_edx = regs->tf_rdx; 509 frame.sf_sc.sc_ecx = regs->tf_rcx; 510 frame.sf_sc.sc_eax = regs->tf_rax; 511 frame.sf_sc.sc_eip = regs->tf_rip; 512 frame.sf_sc.sc_cs = regs->tf_cs; 513 frame.sf_sc.sc_eflags = regs->tf_rflags; 514 frame.sf_sc.sc_esp_at_signal = regs->tf_rsp; 515 frame.sf_sc.sc_ss = regs->tf_ss; 516 frame.sf_sc.sc_err = regs->tf_err; 517 frame.sf_sc.sc_cr2 = (u_int32_t)(uintptr_t)ksi->ksi_addr; 518 frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code); 519 520 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 521 frame.sf_extramask[i] = lmask.__bits[i+1]; 522 523 if (copyout(&frame, fp, sizeof(frame)) != 0) { 524 /* 525 * Process has trashed its stack; give it an illegal 526 * instruction to halt it in its tracks. 527 */ 528 PROC_LOCK(p); 529 sigexit(td, SIGILL); 530 } 531 532 /* 533 * Build context to run handler in. 534 */ 535 regs->tf_rsp = PTROUT(fp); 536 regs->tf_rip = p->p_sysent->sv_sigcode_base; 537 regs->tf_rflags &= ~(PSL_T | PSL_D); 538 regs->tf_cs = _ucode32sel; 539 regs->tf_ss = _udatasel; 540 regs->tf_ds = _udatasel; 541 regs->tf_es = _udatasel; 542 regs->tf_fs = _ufssel; 543 regs->tf_gs = _ugssel; 544 regs->tf_flags = TF_HASSEGS; 545 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 546 PROC_LOCK(p); 547 mtx_lock(&psp->ps_mtx); 548 } 549 550 /* 551 * System call to cleanup state after a signal 552 * has been taken. Reset signal mask and 553 * stack state from context left by sendsig (above). 554 * Return to previous pc and psl as specified by 555 * context left by sendsig. Check carefully to 556 * make sure that the user has not modified the 557 * psl to gain improper privileges or to cause 558 * a machine fault. 559 */ 560 int 561 linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args) 562 { 563 struct l_sigframe frame; 564 struct trapframe *regs; 565 sigset_t bmask; 566 l_sigset_t lmask; 567 int eflags, i; 568 ksiginfo_t ksi; 569 570 regs = td->td_frame; 571 572 #ifdef DEBUG 573 if (ldebug(sigreturn)) 574 printf(ARGS(sigreturn, "%p"), (void *)args->sfp); 575 #endif 576 /* 577 * The trampoline code hands us the sigframe. 578 * It is unsafe to keep track of it ourselves, in the event that a 579 * program jumps out of a signal handler. 580 */ 581 if (copyin(args->sfp, &frame, sizeof(frame)) != 0) 582 return (EFAULT); 583 584 /* 585 * Check for security violations. 586 */ 587 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 588 eflags = frame.sf_sc.sc_eflags; 589 /* 590 * XXX do allow users to change the privileged flag PSL_RF. The 591 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 592 * sometimes set it there too. tf_eflags is kept in the signal 593 * context during signal handling and there is no other place 594 * to remember it, so the PSL_RF bit may be corrupted by the 595 * signal handler without us knowing. Corruption of the PSL_RF 596 * bit at worst causes one more or one less debugger trap, so 597 * allowing it is fairly harmless. 598 */ 599 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 600 return(EINVAL); 601 602 /* 603 * Don't allow users to load a valid privileged %cs. Let the 604 * hardware check for invalid selectors, excess privilege in 605 * other selectors, invalid %eip's and invalid %esp's. 606 */ 607 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 608 if (!CS_SECURE(frame.sf_sc.sc_cs)) { 609 ksiginfo_init_trap(&ksi); 610 ksi.ksi_signo = SIGBUS; 611 ksi.ksi_code = BUS_OBJERR; 612 ksi.ksi_trapno = T_PROTFLT; 613 ksi.ksi_addr = (void *)regs->tf_rip; 614 trapsignal(td, &ksi); 615 return(EINVAL); 616 } 617 618 lmask.__bits[0] = frame.sf_sc.sc_mask; 619 for (i = 0; i < (LINUX_NSIG_WORDS-1); i++) 620 lmask.__bits[i+1] = frame.sf_extramask[i]; 621 linux_to_bsd_sigset(&lmask, &bmask); 622 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 623 624 /* 625 * Restore signal context. 626 */ 627 regs->tf_rdi = frame.sf_sc.sc_edi; 628 regs->tf_rsi = frame.sf_sc.sc_esi; 629 regs->tf_rbp = frame.sf_sc.sc_ebp; 630 regs->tf_rbx = frame.sf_sc.sc_ebx; 631 regs->tf_rdx = frame.sf_sc.sc_edx; 632 regs->tf_rcx = frame.sf_sc.sc_ecx; 633 regs->tf_rax = frame.sf_sc.sc_eax; 634 regs->tf_rip = frame.sf_sc.sc_eip; 635 regs->tf_cs = frame.sf_sc.sc_cs; 636 regs->tf_ds = frame.sf_sc.sc_ds; 637 regs->tf_es = frame.sf_sc.sc_es; 638 regs->tf_fs = frame.sf_sc.sc_fs; 639 regs->tf_gs = frame.sf_sc.sc_gs; 640 regs->tf_rflags = eflags; 641 regs->tf_rsp = frame.sf_sc.sc_esp_at_signal; 642 regs->tf_ss = frame.sf_sc.sc_ss; 643 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 644 645 return (EJUSTRETURN); 646 } 647 648 /* 649 * System call to cleanup state after a signal 650 * has been taken. Reset signal mask and 651 * stack state from context left by rt_sendsig (above). 652 * Return to previous pc and psl as specified by 653 * context left by sendsig. Check carefully to 654 * make sure that the user has not modified the 655 * psl to gain improper privileges or to cause 656 * a machine fault. 657 */ 658 int 659 linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args) 660 { 661 struct l_ucontext uc; 662 struct l_sigcontext *context; 663 sigset_t bmask; 664 l_stack_t *lss; 665 stack_t ss; 666 struct trapframe *regs; 667 int eflags; 668 ksiginfo_t ksi; 669 670 regs = td->td_frame; 671 672 #ifdef DEBUG 673 if (ldebug(rt_sigreturn)) 674 printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp); 675 #endif 676 /* 677 * The trampoline code hands us the ucontext. 678 * It is unsafe to keep track of it ourselves, in the event that a 679 * program jumps out of a signal handler. 680 */ 681 if (copyin(args->ucp, &uc, sizeof(uc)) != 0) 682 return (EFAULT); 683 684 context = &uc.uc_mcontext; 685 686 /* 687 * Check for security violations. 688 */ 689 #define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 690 eflags = context->sc_eflags; 691 /* 692 * XXX do allow users to change the privileged flag PSL_RF. The 693 * cpu sets PSL_RF in tf_eflags for faults. Debuggers should 694 * sometimes set it there too. tf_eflags is kept in the signal 695 * context during signal handling and there is no other place 696 * to remember it, so the PSL_RF bit may be corrupted by the 697 * signal handler without us knowing. Corruption of the PSL_RF 698 * bit at worst causes one more or one less debugger trap, so 699 * allowing it is fairly harmless. 700 */ 701 if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) 702 return(EINVAL); 703 704 /* 705 * Don't allow users to load a valid privileged %cs. Let the 706 * hardware check for invalid selectors, excess privilege in 707 * other selectors, invalid %eip's and invalid %esp's. 708 */ 709 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 710 if (!CS_SECURE(context->sc_cs)) { 711 ksiginfo_init_trap(&ksi); 712 ksi.ksi_signo = SIGBUS; 713 ksi.ksi_code = BUS_OBJERR; 714 ksi.ksi_trapno = T_PROTFLT; 715 ksi.ksi_addr = (void *)regs->tf_rip; 716 trapsignal(td, &ksi); 717 return(EINVAL); 718 } 719 720 linux_to_bsd_sigset(&uc.uc_sigmask, &bmask); 721 kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0); 722 723 /* 724 * Restore signal context 725 */ 726 regs->tf_gs = context->sc_gs; 727 regs->tf_fs = context->sc_fs; 728 regs->tf_es = context->sc_es; 729 regs->tf_ds = context->sc_ds; 730 regs->tf_rdi = context->sc_edi; 731 regs->tf_rsi = context->sc_esi; 732 regs->tf_rbp = context->sc_ebp; 733 regs->tf_rbx = context->sc_ebx; 734 regs->tf_rdx = context->sc_edx; 735 regs->tf_rcx = context->sc_ecx; 736 regs->tf_rax = context->sc_eax; 737 regs->tf_rip = context->sc_eip; 738 regs->tf_cs = context->sc_cs; 739 regs->tf_rflags = eflags; 740 regs->tf_rsp = context->sc_esp_at_signal; 741 regs->tf_ss = context->sc_ss; 742 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 743 744 /* 745 * call sigaltstack & ignore results.. 746 */ 747 lss = &uc.uc_stack; 748 ss.ss_sp = PTRIN(lss->ss_sp); 749 ss.ss_size = lss->ss_size; 750 ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags); 751 752 #ifdef DEBUG 753 if (ldebug(rt_sigreturn)) 754 printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%lx, mask: 0x%x"), 755 ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask); 756 #endif 757 (void)kern_sigaltstack(td, &ss, NULL); 758 759 return (EJUSTRETURN); 760 } 761 762 static int 763 linux32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 764 { 765 struct proc *p; 766 struct trapframe *frame; 767 768 p = td->td_proc; 769 frame = td->td_frame; 770 771 sa->args[0] = frame->tf_rbx; 772 sa->args[1] = frame->tf_rcx; 773 sa->args[2] = frame->tf_rdx; 774 sa->args[3] = frame->tf_rsi; 775 sa->args[4] = frame->tf_rdi; 776 sa->args[5] = frame->tf_rbp; /* Unconfirmed */ 777 sa->code = frame->tf_rax; 778 779 if (sa->code >= p->p_sysent->sv_size) 780 sa->callp = &p->p_sysent->sv_table[0]; 781 else 782 sa->callp = &p->p_sysent->sv_table[sa->code]; 783 sa->narg = sa->callp->sy_narg; 784 785 td->td_retval[0] = 0; 786 td->td_retval[1] = frame->tf_rdx; 787 788 return (0); 789 } 790 791 /* 792 * If a linux binary is exec'ing something, try this image activator 793 * first. We override standard shell script execution in order to 794 * be able to modify the interpreter path. We only do this if a linux 795 * binary is doing the exec, so we do not create an EXEC module for it. 796 */ 797 static int exec_linux_imgact_try(struct image_params *iparams); 798 799 static int 800 exec_linux_imgact_try(struct image_params *imgp) 801 { 802 const char *head = (const char *)imgp->image_header; 803 char *rpath; 804 int error = -1; 805 806 /* 807 * The interpreter for shell scripts run from a linux binary needs 808 * to be located in /compat/linux if possible in order to recursively 809 * maintain linux path emulation. 810 */ 811 if (((const short *)head)[0] == SHELLMAGIC) { 812 /* 813 * Run our normal shell image activator. If it succeeds attempt 814 * to use the alternate path for the interpreter. If an 815 * alternate * path is found, use our stringspace to store it. 816 */ 817 if ((error = exec_shell_imgact(imgp)) == 0) { 818 linux_emul_convpath(FIRST_THREAD_IN_PROC(imgp->proc), 819 imgp->interpreter_name, UIO_SYSSPACE, &rpath, 0, 820 AT_FDCWD); 821 if (rpath != NULL) 822 imgp->args->fname_buf = 823 imgp->interpreter_name = rpath; 824 } 825 } 826 return (error); 827 } 828 829 /* 830 * Clear registers on exec 831 * XXX copied from ia32_signal.c. 832 */ 833 static void 834 exec_linux_setregs(struct thread *td, struct image_params *imgp, u_long stack) 835 { 836 struct trapframe *regs = td->td_frame; 837 struct pcb *pcb = td->td_pcb; 838 839 mtx_lock(&dt_lock); 840 if (td->td_proc->p_md.md_ldt != NULL) 841 user_ldt_free(td); 842 else 843 mtx_unlock(&dt_lock); 844 845 critical_enter(); 846 wrmsr(MSR_FSBASE, 0); 847 wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ 848 pcb->pcb_fsbase = 0; 849 pcb->pcb_gsbase = 0; 850 critical_exit(); 851 pcb->pcb_initial_fpucw = __LINUX_NPXCW__; 852 853 bzero((char *)regs, sizeof(struct trapframe)); 854 regs->tf_rip = imgp->entry_addr; 855 regs->tf_rsp = stack; 856 regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); 857 regs->tf_gs = _ugssel; 858 regs->tf_fs = _ufssel; 859 regs->tf_es = _udatasel; 860 regs->tf_ds = _udatasel; 861 regs->tf_ss = _udatasel; 862 regs->tf_flags = TF_HASSEGS; 863 regs->tf_cs = _ucode32sel; 864 regs->tf_rbx = imgp->ps_strings; 865 866 fpstate_drop(td); 867 868 /* Do full restore on return so that we can change to a different %cs */ 869 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 870 clear_pcb_flags(pcb, PCB_GS32BIT); 871 td->td_retval[1] = 0; 872 } 873 874 /* 875 * XXX copied from ia32_sysvec.c. 876 */ 877 static register_t * 878 linux_copyout_strings(struct image_params *imgp) 879 { 880 int argc, envc; 881 u_int32_t *vectp; 882 char *stringp, *destp; 883 u_int32_t *stack_base; 884 struct linux32_ps_strings *arginfo; 885 886 /* 887 * Calculate string base and vector table pointers. 888 * Also deal with signal trampoline code for this exec type. 889 */ 890 arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS; 891 destp = (caddr_t)arginfo - SPARE_USRSPACE - linux_szplatform - 892 roundup((ARG_MAX - imgp->args->stringspace), 893 sizeof(char *)); 894 895 /* 896 * Install LINUX_PLATFORM 897 */ 898 copyout(linux_platform, ((caddr_t)arginfo - linux_szplatform), 899 linux_szplatform); 900 901 /* 902 * If we have a valid auxargs ptr, prepare some room 903 * on the stack. 904 */ 905 if (imgp->auxargs) { 906 /* 907 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 908 * lower compatibility. 909 */ 910 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : 911 (LINUX_AT_COUNT * 2); 912 /* 913 * The '+ 2' is for the null pointers at the end of each of 914 * the arg and env vector sets,and imgp->auxarg_size is room 915 * for argument of Runtime loader. 916 */ 917 vectp = (u_int32_t *) (destp - (imgp->args->argc + 918 imgp->args->envc + 2 + imgp->auxarg_size) * 919 sizeof(u_int32_t)); 920 921 } else 922 /* 923 * The '+ 2' is for the null pointers at the end of each of 924 * the arg and env vector sets 925 */ 926 vectp = (u_int32_t *)(destp - (imgp->args->argc + 927 imgp->args->envc + 2) * sizeof(u_int32_t)); 928 929 /* 930 * vectp also becomes our initial stack base 931 */ 932 stack_base = vectp; 933 934 stringp = imgp->args->begin_argv; 935 argc = imgp->args->argc; 936 envc = imgp->args->envc; 937 /* 938 * Copy out strings - arguments and environment. 939 */ 940 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 941 942 /* 943 * Fill in "ps_strings" struct for ps, w, etc. 944 */ 945 suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp); 946 suword32(&arginfo->ps_nargvstr, argc); 947 948 /* 949 * Fill in argument portion of vector table. 950 */ 951 for (; argc > 0; --argc) { 952 suword32(vectp++, (uint32_t)(intptr_t)destp); 953 while (*stringp++ != 0) 954 destp++; 955 destp++; 956 } 957 958 /* a null vector table pointer separates the argp's from the envp's */ 959 suword32(vectp++, 0); 960 961 suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp); 962 suword32(&arginfo->ps_nenvstr, envc); 963 964 /* 965 * Fill in environment portion of vector table. 966 */ 967 for (; envc > 0; --envc) { 968 suword32(vectp++, (uint32_t)(intptr_t)destp); 969 while (*stringp++ != 0) 970 destp++; 971 destp++; 972 } 973 974 /* end of vector table is a null pointer */ 975 suword32(vectp, 0); 976 977 return ((register_t *)stack_base); 978 } 979 980 SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0, 981 "32-bit Linux emulation"); 982 983 static u_long linux32_maxdsiz = LINUX32_MAXDSIZ; 984 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW, 985 &linux32_maxdsiz, 0, ""); 986 static u_long linux32_maxssiz = LINUX32_MAXSSIZ; 987 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW, 988 &linux32_maxssiz, 0, ""); 989 static u_long linux32_maxvmem = LINUX32_MAXVMEM; 990 SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW, 991 &linux32_maxvmem, 0, ""); 992 993 static void 994 linux32_fixlimit(struct rlimit *rl, int which) 995 { 996 997 switch (which) { 998 case RLIMIT_DATA: 999 if (linux32_maxdsiz != 0) { 1000 if (rl->rlim_cur > linux32_maxdsiz) 1001 rl->rlim_cur = linux32_maxdsiz; 1002 if (rl->rlim_max > linux32_maxdsiz) 1003 rl->rlim_max = linux32_maxdsiz; 1004 } 1005 break; 1006 case RLIMIT_STACK: 1007 if (linux32_maxssiz != 0) { 1008 if (rl->rlim_cur > linux32_maxssiz) 1009 rl->rlim_cur = linux32_maxssiz; 1010 if (rl->rlim_max > linux32_maxssiz) 1011 rl->rlim_max = linux32_maxssiz; 1012 } 1013 break; 1014 case RLIMIT_VMEM: 1015 if (linux32_maxvmem != 0) { 1016 if (rl->rlim_cur > linux32_maxvmem) 1017 rl->rlim_cur = linux32_maxvmem; 1018 if (rl->rlim_max > linux32_maxvmem) 1019 rl->rlim_max = linux32_maxvmem; 1020 } 1021 break; 1022 } 1023 } 1024 1025 struct sysentvec elf_linux_sysvec = { 1026 .sv_size = LINUX_SYS_MAXSYSCALL, 1027 .sv_table = linux_sysent, 1028 .sv_mask = 0, 1029 .sv_sigsize = LINUX_SIGTBLSZ, 1030 .sv_sigtbl = bsd_to_linux_signal, 1031 .sv_errsize = ELAST + 1, 1032 .sv_errtbl = bsd_to_linux_errno, 1033 .sv_transtrap = translate_traps, 1034 .sv_fixup = elf_linux_fixup, 1035 .sv_sendsig = linux_sendsig, 1036 .sv_sigcode = linux_sigcode, 1037 .sv_szsigcode = &linux_szsigcode, 1038 .sv_prepsyscall = NULL, 1039 .sv_name = "Linux ELF32", 1040 .sv_coredump = elf32_coredump, 1041 .sv_imgact_try = exec_linux_imgact_try, 1042 .sv_minsigstksz = LINUX_MINSIGSTKSZ, 1043 .sv_pagesize = PAGE_SIZE, 1044 .sv_minuser = VM_MIN_ADDRESS, 1045 .sv_maxuser = LINUX32_MAXUSER, 1046 .sv_usrstack = LINUX32_USRSTACK, 1047 .sv_psstrings = LINUX32_PS_STRINGS, 1048 .sv_stackprot = VM_PROT_ALL, 1049 .sv_copyout_strings = linux_copyout_strings, 1050 .sv_setregs = exec_linux_setregs, 1051 .sv_fixlimit = linux32_fixlimit, 1052 .sv_maxssiz = &linux32_maxssiz, 1053 .sv_flags = SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP, 1054 .sv_set_syscall_retval = cpu_set_syscall_retval, 1055 .sv_fetch_syscall_args = linux32_fetch_syscall_args, 1056 .sv_syscallnames = NULL, 1057 .sv_shared_page_base = LINUX32_SHAREDPAGE, 1058 .sv_shared_page_len = PAGE_SIZE, 1059 .sv_schedtail = linux_schedtail, 1060 }; 1061 INIT_SYSENTVEC(elf_sysvec, &elf_linux_sysvec); 1062 1063 static char GNU_ABI_VENDOR[] = "GNU"; 1064 static int GNULINUX_ABI_DESC = 0; 1065 1066 static boolean_t 1067 linux32_trans_osrel(const Elf_Note *note, int32_t *osrel) 1068 { 1069 const Elf32_Word *desc; 1070 uintptr_t p; 1071 1072 p = (uintptr_t)(note + 1); 1073 p += roundup2(note->n_namesz, sizeof(Elf32_Addr)); 1074 1075 desc = (const Elf32_Word *)p; 1076 if (desc[0] != GNULINUX_ABI_DESC) 1077 return (FALSE); 1078 1079 /* 1080 * For linux we encode osrel as follows (see linux_mib.c): 1081 * VVVMMMIII (version, major, minor), see linux_mib.c. 1082 */ 1083 *osrel = desc[1] * 1000000 + desc[2] * 1000 + desc[3]; 1084 1085 return (TRUE); 1086 } 1087 1088 static Elf_Brandnote linux32_brandnote = { 1089 .hdr.n_namesz = sizeof(GNU_ABI_VENDOR), 1090 .hdr.n_descsz = 16, /* XXX at least 16 */ 1091 .hdr.n_type = 1, 1092 .vendor = GNU_ABI_VENDOR, 1093 .flags = BN_TRANSLATE_OSREL, 1094 .trans_osrel = linux32_trans_osrel 1095 }; 1096 1097 static Elf32_Brandinfo linux_brand = { 1098 .brand = ELFOSABI_LINUX, 1099 .machine = EM_386, 1100 .compat_3_brand = "Linux", 1101 .emul_path = "/compat/linux", 1102 .interp_path = "/lib/ld-linux.so.1", 1103 .sysvec = &elf_linux_sysvec, 1104 .interp_newpath = NULL, 1105 .brand_note = &linux32_brandnote, 1106 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1107 }; 1108 1109 static Elf32_Brandinfo linux_glibc2brand = { 1110 .brand = ELFOSABI_LINUX, 1111 .machine = EM_386, 1112 .compat_3_brand = "Linux", 1113 .emul_path = "/compat/linux", 1114 .interp_path = "/lib/ld-linux.so.2", 1115 .sysvec = &elf_linux_sysvec, 1116 .interp_newpath = NULL, 1117 .brand_note = &linux32_brandnote, 1118 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 1119 }; 1120 1121 Elf32_Brandinfo *linux_brandlist[] = { 1122 &linux_brand, 1123 &linux_glibc2brand, 1124 NULL 1125 }; 1126 1127 static int 1128 linux_elf_modevent(module_t mod, int type, void *data) 1129 { 1130 Elf32_Brandinfo **brandinfo; 1131 int error; 1132 struct linux_ioctl_handler **lihp; 1133 struct linux_device_handler **ldhp; 1134 1135 error = 0; 1136 1137 switch(type) { 1138 case MOD_LOAD: 1139 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1140 ++brandinfo) 1141 if (elf32_insert_brand_entry(*brandinfo) < 0) 1142 error = EINVAL; 1143 if (error == 0) { 1144 SET_FOREACH(lihp, linux_ioctl_handler_set) 1145 linux_ioctl_register_handler(*lihp); 1146 SET_FOREACH(ldhp, linux_device_handler_set) 1147 linux_device_register_handler(*ldhp); 1148 mtx_init(&emul_lock, "emuldata lock", NULL, MTX_DEF); 1149 sx_init(&emul_shared_lock, "emuldata->shared lock"); 1150 LIST_INIT(&futex_list); 1151 mtx_init(&futex_mtx, "ftllk", NULL, MTX_DEF); 1152 linux_exit_tag = EVENTHANDLER_REGISTER(process_exit, 1153 linux_proc_exit, NULL, 1000); 1154 linux_exec_tag = EVENTHANDLER_REGISTER(process_exec, 1155 linux_proc_exec, NULL, 1000); 1156 linux_szplatform = roundup(strlen(linux_platform) + 1, 1157 sizeof(char *)); 1158 linux_osd_jail_register(); 1159 stclohz = (stathz ? stathz : hz); 1160 if (bootverbose) 1161 printf("Linux ELF exec handler installed\n"); 1162 } else 1163 printf("cannot insert Linux ELF brand handler\n"); 1164 break; 1165 case MOD_UNLOAD: 1166 for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL; 1167 ++brandinfo) 1168 if (elf32_brand_inuse(*brandinfo)) 1169 error = EBUSY; 1170 if (error == 0) { 1171 for (brandinfo = &linux_brandlist[0]; 1172 *brandinfo != NULL; ++brandinfo) 1173 if (elf32_remove_brand_entry(*brandinfo) < 0) 1174 error = EINVAL; 1175 } 1176 if (error == 0) { 1177 SET_FOREACH(lihp, linux_ioctl_handler_set) 1178 linux_ioctl_unregister_handler(*lihp); 1179 SET_FOREACH(ldhp, linux_device_handler_set) 1180 linux_device_unregister_handler(*ldhp); 1181 mtx_destroy(&emul_lock); 1182 sx_destroy(&emul_shared_lock); 1183 mtx_destroy(&futex_mtx); 1184 EVENTHANDLER_DEREGISTER(process_exit, linux_exit_tag); 1185 EVENTHANDLER_DEREGISTER(process_exec, linux_exec_tag); 1186 linux_osd_jail_deregister(); 1187 if (bootverbose) 1188 printf("Linux ELF exec handler removed\n"); 1189 } else 1190 printf("Could not deinstall ELF interpreter entry\n"); 1191 break; 1192 default: 1193 return EOPNOTSUPP; 1194 } 1195 return error; 1196 } 1197 1198 static moduledata_t linux_elf_mod = { 1199 "linuxelf", 1200 linux_elf_modevent, 1201 0 1202 }; 1203 1204 DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
Cache object: 0f7e97c2c815cff9e7a370d6c549da0a
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