1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2003 Peter Wemm 5 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 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 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/exec.h> 41 #include <sys/fcntl.h> 42 #include <sys/imgact.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/malloc.h> 46 #include <sys/mutex.h> 47 #include <sys/mman.h> 48 #include <sys/namei.h> 49 #include <sys/pioctl.h> 50 #include <sys/proc.h> 51 #include <sys/procfs.h> 52 #include <sys/resourcevar.h> 53 #include <sys/systm.h> 54 #include <sys/signalvar.h> 55 #include <sys/stat.h> 56 #include <sys/sx.h> 57 #include <sys/syscall.h> 58 #include <sys/syscallsubr.h> 59 #include <sys/sysctl.h> 60 #include <sys/sysent.h> 61 #include <sys/vnode.h> 62 63 #include <vm/vm.h> 64 #include <vm/vm_kern.h> 65 #include <vm/vm_param.h> 66 #include <vm/pmap.h> 67 #include <vm/vm_map.h> 68 #include <vm/vm_object.h> 69 #include <vm/vm_extern.h> 70 71 #include <compat/freebsd32/freebsd32_signal.h> 72 #include <compat/freebsd32/freebsd32_util.h> 73 #include <compat/freebsd32/freebsd32_proto.h> 74 #include <compat/freebsd32/freebsd32.h> 75 #include <compat/ia32/ia32_signal.h> 76 #include <machine/psl.h> 77 #include <machine/segments.h> 78 #include <machine/specialreg.h> 79 #include <machine/frame.h> 80 #include <machine/md_var.h> 81 #include <machine/pcb.h> 82 #include <machine/cpufunc.h> 83 #include <machine/trap.h> 84 85 #ifdef COMPAT_FREEBSD4 86 static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *); 87 #endif 88 89 #define CS_SECURE(cs) (ISPL(cs) == SEL_UPL) 90 #define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0) 91 92 static void 93 ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp, 94 char *xfpusave, size_t xfpusave_len) 95 { 96 size_t max_len, len; 97 98 /* 99 * XXX Format of 64bit and 32bit FXSAVE areas differs. FXSAVE 100 * in 32bit mode saves %cs and %ds, while on 64bit it saves 101 * 64bit instruction and data pointers. Ignore the difference 102 * for now, it should be irrelevant for most applications. 103 */ 104 mcp->mc_ownedfp = fpugetregs(td); 105 bcopy(get_pcb_user_save_td(td), &mcp->mc_fpstate[0], 106 sizeof(mcp->mc_fpstate)); 107 mcp->mc_fpformat = fpuformat(); 108 if (!use_xsave || xfpusave_len == 0) 109 return; 110 max_len = cpu_max_ext_state_size - sizeof(struct savefpu); 111 len = xfpusave_len; 112 if (len > max_len) { 113 len = max_len; 114 bzero(xfpusave + max_len, len - max_len); 115 } 116 mcp->mc_flags |= _MC_IA32_HASFPXSTATE; 117 mcp->mc_xfpustate_len = len; 118 bcopy(get_pcb_user_save_td(td) + 1, xfpusave, len); 119 } 120 121 static int 122 ia32_set_fpcontext(struct thread *td, struct ia32_mcontext *mcp, 123 char *xfpustate, size_t xfpustate_len) 124 { 125 int error; 126 127 if (mcp->mc_fpformat == _MC_FPFMT_NODEV) 128 return (0); 129 else if (mcp->mc_fpformat != _MC_FPFMT_XMM) 130 return (EINVAL); 131 else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE) { 132 /* We don't care what state is left in the FPU or PCB. */ 133 fpstate_drop(td); 134 error = 0; 135 } else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU || 136 mcp->mc_ownedfp == _MC_FPOWNED_PCB) { 137 error = fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate, 138 xfpustate, xfpustate_len); 139 } else 140 return (EINVAL); 141 return (error); 142 } 143 144 /* 145 * Get machine context. 146 */ 147 static int 148 ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags) 149 { 150 struct pcb *pcb; 151 struct trapframe *tp; 152 153 pcb = td->td_pcb; 154 tp = td->td_frame; 155 156 PROC_LOCK(curthread->td_proc); 157 mcp->mc_onstack = sigonstack(tp->tf_rsp); 158 PROC_UNLOCK(curthread->td_proc); 159 /* Entry into kernel always sets TF_HASSEGS */ 160 mcp->mc_gs = tp->tf_gs; 161 mcp->mc_fs = tp->tf_fs; 162 mcp->mc_es = tp->tf_es; 163 mcp->mc_ds = tp->tf_ds; 164 mcp->mc_edi = tp->tf_rdi; 165 mcp->mc_esi = tp->tf_rsi; 166 mcp->mc_ebp = tp->tf_rbp; 167 mcp->mc_isp = tp->tf_rsp; 168 mcp->mc_eflags = tp->tf_rflags; 169 if (flags & GET_MC_CLEAR_RET) { 170 mcp->mc_eax = 0; 171 mcp->mc_edx = 0; 172 mcp->mc_eflags &= ~PSL_C; 173 } else { 174 mcp->mc_eax = tp->tf_rax; 175 mcp->mc_edx = tp->tf_rdx; 176 } 177 mcp->mc_ebx = tp->tf_rbx; 178 mcp->mc_ecx = tp->tf_rcx; 179 mcp->mc_eip = tp->tf_rip; 180 mcp->mc_cs = tp->tf_cs; 181 mcp->mc_esp = tp->tf_rsp; 182 mcp->mc_ss = tp->tf_ss; 183 mcp->mc_len = sizeof(*mcp); 184 mcp->mc_flags = tp->tf_flags; 185 ia32_get_fpcontext(td, mcp, NULL, 0); 186 mcp->mc_fsbase = pcb->pcb_fsbase; 187 mcp->mc_gsbase = pcb->pcb_gsbase; 188 mcp->mc_xfpustate = 0; 189 mcp->mc_xfpustate_len = 0; 190 bzero(mcp->mc_spare2, sizeof(mcp->mc_spare2)); 191 return (0); 192 } 193 194 /* 195 * Set machine context. 196 * 197 * However, we don't set any but the user modifiable flags, and we won't 198 * touch the cs selector. 199 */ 200 static int 201 ia32_set_mcontext(struct thread *td, struct ia32_mcontext *mcp) 202 { 203 struct trapframe *tp; 204 char *xfpustate; 205 long rflags; 206 int ret; 207 208 tp = td->td_frame; 209 if (mcp->mc_len != sizeof(*mcp)) 210 return (EINVAL); 211 rflags = (mcp->mc_eflags & PSL_USERCHANGE) | 212 (tp->tf_rflags & ~PSL_USERCHANGE); 213 if (mcp->mc_flags & _MC_IA32_HASFPXSTATE) { 214 if (mcp->mc_xfpustate_len > cpu_max_ext_state_size - 215 sizeof(struct savefpu)) 216 return (EINVAL); 217 xfpustate = __builtin_alloca(mcp->mc_xfpustate_len); 218 ret = copyin(PTRIN(mcp->mc_xfpustate), xfpustate, 219 mcp->mc_xfpustate_len); 220 if (ret != 0) 221 return (ret); 222 } else 223 xfpustate = NULL; 224 ret = ia32_set_fpcontext(td, mcp, xfpustate, mcp->mc_xfpustate_len); 225 if (ret != 0) 226 return (ret); 227 tp->tf_gs = mcp->mc_gs; 228 tp->tf_fs = mcp->mc_fs; 229 tp->tf_es = mcp->mc_es; 230 tp->tf_ds = mcp->mc_ds; 231 tp->tf_flags = TF_HASSEGS; 232 tp->tf_rdi = mcp->mc_edi; 233 tp->tf_rsi = mcp->mc_esi; 234 tp->tf_rbp = mcp->mc_ebp; 235 tp->tf_rbx = mcp->mc_ebx; 236 tp->tf_rdx = mcp->mc_edx; 237 tp->tf_rcx = mcp->mc_ecx; 238 tp->tf_rax = mcp->mc_eax; 239 /* trapno, err */ 240 tp->tf_rip = mcp->mc_eip; 241 tp->tf_rflags = rflags; 242 tp->tf_rsp = mcp->mc_esp; 243 tp->tf_ss = mcp->mc_ss; 244 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 245 return (0); 246 } 247 248 /* 249 * The first two fields of a ucontext_t are the signal mask and 250 * the machine context. The next field is uc_link; we want to 251 * avoid destroying the link when copying out contexts. 252 */ 253 #define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link) 254 255 int 256 freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap) 257 { 258 struct ia32_ucontext uc; 259 int ret; 260 261 if (uap->ucp == NULL) 262 ret = EINVAL; 263 else { 264 bzero(&uc, sizeof(uc)); 265 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 266 PROC_LOCK(td->td_proc); 267 uc.uc_sigmask = td->td_sigmask; 268 PROC_UNLOCK(td->td_proc); 269 ret = copyout(&uc, uap->ucp, UC_COPY_SIZE); 270 } 271 return (ret); 272 } 273 274 int 275 freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap) 276 { 277 struct ia32_ucontext uc; 278 int ret; 279 280 if (uap->ucp == NULL) 281 ret = EINVAL; 282 else { 283 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 284 if (ret == 0) { 285 ret = ia32_set_mcontext(td, &uc.uc_mcontext); 286 if (ret == 0) { 287 kern_sigprocmask(td, SIG_SETMASK, 288 &uc.uc_sigmask, NULL, 0); 289 } 290 } 291 } 292 return (ret == 0 ? EJUSTRETURN : ret); 293 } 294 295 int 296 freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap) 297 { 298 struct ia32_ucontext uc; 299 int ret; 300 301 if (uap->oucp == NULL || uap->ucp == NULL) 302 ret = EINVAL; 303 else { 304 bzero(&uc, sizeof(uc)); 305 ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET); 306 PROC_LOCK(td->td_proc); 307 uc.uc_sigmask = td->td_sigmask; 308 PROC_UNLOCK(td->td_proc); 309 ret = copyout(&uc, uap->oucp, UC_COPY_SIZE); 310 if (ret == 0) { 311 ret = copyin(uap->ucp, &uc, UC_COPY_SIZE); 312 if (ret == 0) { 313 ret = ia32_set_mcontext(td, &uc.uc_mcontext); 314 if (ret == 0) { 315 kern_sigprocmask(td, SIG_SETMASK, 316 &uc.uc_sigmask, NULL, 0); 317 } 318 } 319 } 320 } 321 return (ret == 0 ? EJUSTRETURN : ret); 322 } 323 324 /* 325 * Send an interrupt to process. 326 * 327 * Stack is set up to allow sigcode stored 328 * at top to call routine, followed by kcall 329 * to sigreturn routine below. After sigreturn 330 * resets the signal mask, the stack, and the 331 * frame pointer, it returns to the user 332 * specified pc, psl. 333 */ 334 335 #ifdef COMPAT_43 336 static void 337 ia32_osendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 338 { 339 struct ia32_sigframe3 sf, *fp; 340 struct proc *p; 341 struct thread *td; 342 struct sigacts *psp; 343 struct trapframe *regs; 344 int sig; 345 int oonstack; 346 347 td = curthread; 348 p = td->td_proc; 349 PROC_LOCK_ASSERT(p, MA_OWNED); 350 sig = ksi->ksi_signo; 351 psp = p->p_sigacts; 352 mtx_assert(&psp->ps_mtx, MA_OWNED); 353 regs = td->td_frame; 354 oonstack = sigonstack(regs->tf_rsp); 355 356 /* Allocate space for the signal handler context. */ 357 if ((td->td_pflags & TDP_ALTSTACK) && !oonstack && 358 SIGISMEMBER(psp->ps_sigonstack, sig)) { 359 fp = (struct ia32_sigframe3 *)((uintptr_t)td->td_sigstk.ss_sp + 360 td->td_sigstk.ss_size - sizeof(sf)); 361 td->td_sigstk.ss_flags |= SS_ONSTACK; 362 } else 363 fp = (struct ia32_sigframe3 *)regs->tf_rsp - 1; 364 365 /* Build the argument list for the signal handler. */ 366 sf.sf_signum = sig; 367 sf.sf_scp = (register_t)&fp->sf_siginfo.si_sc; 368 bzero(&sf.sf_siginfo, sizeof(sf.sf_siginfo)); 369 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 370 /* Signal handler installed with SA_SIGINFO. */ 371 sf.sf_arg2 = (register_t)&fp->sf_siginfo; 372 sf.sf_siginfo.si_signo = sig; 373 sf.sf_siginfo.si_code = ksi->ksi_code; 374 sf.sf_ah = (uintptr_t)catcher; 375 sf.sf_addr = 0; 376 } else { 377 /* Old FreeBSD-style arguments. */ 378 sf.sf_arg2 = ksi->ksi_code; 379 sf.sf_addr = (register_t)ksi->ksi_addr; 380 sf.sf_ah = (uintptr_t)catcher; 381 } 382 mtx_unlock(&psp->ps_mtx); 383 PROC_UNLOCK(p); 384 385 /* Save most if not all of trap frame. */ 386 sf.sf_siginfo.si_sc.sc_eax = regs->tf_rax; 387 sf.sf_siginfo.si_sc.sc_ebx = regs->tf_rbx; 388 sf.sf_siginfo.si_sc.sc_ecx = regs->tf_rcx; 389 sf.sf_siginfo.si_sc.sc_edx = regs->tf_rdx; 390 sf.sf_siginfo.si_sc.sc_esi = regs->tf_rsi; 391 sf.sf_siginfo.si_sc.sc_edi = regs->tf_rdi; 392 sf.sf_siginfo.si_sc.sc_cs = regs->tf_cs; 393 sf.sf_siginfo.si_sc.sc_ds = regs->tf_ds; 394 sf.sf_siginfo.si_sc.sc_ss = regs->tf_ss; 395 sf.sf_siginfo.si_sc.sc_es = regs->tf_es; 396 sf.sf_siginfo.si_sc.sc_fs = regs->tf_fs; 397 sf.sf_siginfo.si_sc.sc_gs = regs->tf_gs; 398 sf.sf_siginfo.si_sc.sc_isp = regs->tf_rsp; 399 400 /* Build the signal context to be used by osigreturn(). */ 401 sf.sf_siginfo.si_sc.sc_onstack = (oonstack) ? 1 : 0; 402 SIG2OSIG(*mask, sf.sf_siginfo.si_sc.sc_mask); 403 sf.sf_siginfo.si_sc.sc_esp = regs->tf_rsp; 404 sf.sf_siginfo.si_sc.sc_ebp = regs->tf_rbp; 405 sf.sf_siginfo.si_sc.sc_eip = regs->tf_rip; 406 sf.sf_siginfo.si_sc.sc_eflags = regs->tf_rflags; 407 sf.sf_siginfo.si_sc.sc_trapno = regs->tf_trapno; 408 sf.sf_siginfo.si_sc.sc_err = regs->tf_err; 409 410 /* 411 * Copy the sigframe out to the user's stack. 412 */ 413 if (copyout(&sf, fp, sizeof(*fp)) != 0) { 414 #ifdef DEBUG 415 printf("process %ld has trashed its stack\n", (long)p->p_pid); 416 #endif 417 PROC_LOCK(p); 418 sigexit(td, SIGILL); 419 } 420 421 regs->tf_rsp = (uintptr_t)fp; 422 regs->tf_rip = p->p_sysent->sv_psstrings - sz_ia32_osigcode; 423 regs->tf_rflags &= ~(PSL_T | PSL_D); 424 regs->tf_cs = _ucode32sel; 425 regs->tf_ds = _udatasel; 426 regs->tf_es = _udatasel; 427 regs->tf_fs = _udatasel; 428 regs->tf_ss = _udatasel; 429 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 430 PROC_LOCK(p); 431 mtx_lock(&psp->ps_mtx); 432 } 433 #endif 434 435 #ifdef COMPAT_FREEBSD4 436 static void 437 freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 438 { 439 struct ia32_sigframe4 sf, *sfp; 440 struct siginfo32 siginfo; 441 struct proc *p; 442 struct thread *td; 443 struct sigacts *psp; 444 struct trapframe *regs; 445 int oonstack; 446 int sig; 447 448 td = curthread; 449 p = td->td_proc; 450 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 451 452 PROC_LOCK_ASSERT(p, MA_OWNED); 453 sig = siginfo.si_signo; 454 psp = p->p_sigacts; 455 mtx_assert(&psp->ps_mtx, MA_OWNED); 456 regs = td->td_frame; 457 oonstack = sigonstack(regs->tf_rsp); 458 459 /* Save user context. */ 460 bzero(&sf, sizeof(sf)); 461 sf.sf_uc.uc_sigmask = *mask; 462 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 463 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 464 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 465 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 466 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 467 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi; 468 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi; 469 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp; 470 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */ 471 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx; 472 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx; 473 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx; 474 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax; 475 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno; 476 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err; 477 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip; 478 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs; 479 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags; 480 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp; 481 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss; 482 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds; 483 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es; 484 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs; 485 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs; 486 bzero(sf.sf_uc.uc_mcontext.mc_fpregs, 487 sizeof(sf.sf_uc.uc_mcontext.mc_fpregs)); 488 bzero(sf.sf_uc.uc_mcontext.__spare__, 489 sizeof(sf.sf_uc.uc_mcontext.__spare__)); 490 bzero(sf.sf_uc.__spare__, sizeof(sf.sf_uc.__spare__)); 491 492 /* Allocate space for the signal handler context. */ 493 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 494 SIGISMEMBER(psp->ps_sigonstack, sig)) { 495 sfp = (struct ia32_sigframe4 *)((uintptr_t)td->td_sigstk.ss_sp + 496 td->td_sigstk.ss_size - sizeof(sf)); 497 } else 498 sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1; 499 PROC_UNLOCK(p); 500 501 /* Build the argument list for the signal handler. */ 502 sf.sf_signum = sig; 503 sf.sf_ucontext = (register_t)&sfp->sf_uc; 504 bzero(&sf.sf_si, sizeof(sf.sf_si)); 505 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 506 /* Signal handler installed with SA_SIGINFO. */ 507 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si; 508 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 509 510 /* Fill in POSIX parts */ 511 sf.sf_si = siginfo; 512 sf.sf_si.si_signo = sig; 513 } else { 514 /* Old FreeBSD-style arguments. */ 515 sf.sf_siginfo = siginfo.si_code; 516 sf.sf_addr = (u_int32_t)siginfo.si_addr; 517 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 518 } 519 mtx_unlock(&psp->ps_mtx); 520 521 /* 522 * Copy the sigframe out to the user's stack. 523 */ 524 if (copyout(&sf, sfp, sizeof(*sfp)) != 0) { 525 #ifdef DEBUG 526 printf("process %ld has trashed its stack\n", (long)p->p_pid); 527 #endif 528 PROC_LOCK(p); 529 sigexit(td, SIGILL); 530 } 531 532 regs->tf_rsp = (uintptr_t)sfp; 533 regs->tf_rip = p->p_sysent->sv_sigcode_base + sz_ia32_sigcode - 534 sz_freebsd4_ia32_sigcode; 535 regs->tf_rflags &= ~(PSL_T | PSL_D); 536 regs->tf_cs = _ucode32sel; 537 regs->tf_ss = _udatasel; 538 regs->tf_ds = _udatasel; 539 regs->tf_es = _udatasel; 540 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 541 /* leave user %fs and %gs untouched */ 542 PROC_LOCK(p); 543 mtx_lock(&psp->ps_mtx); 544 } 545 #endif /* COMPAT_FREEBSD4 */ 546 547 void 548 ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask) 549 { 550 struct ia32_sigframe sf, *sfp; 551 struct siginfo32 siginfo; 552 struct proc *p; 553 struct thread *td; 554 struct sigacts *psp; 555 char *sp; 556 struct trapframe *regs; 557 char *xfpusave; 558 size_t xfpusave_len; 559 int oonstack; 560 int sig; 561 562 siginfo_to_siginfo32(&ksi->ksi_info, &siginfo); 563 td = curthread; 564 p = td->td_proc; 565 PROC_LOCK_ASSERT(p, MA_OWNED); 566 sig = siginfo.si_signo; 567 psp = p->p_sigacts; 568 #ifdef COMPAT_FREEBSD4 569 if (SIGISMEMBER(psp->ps_freebsd4, sig)) { 570 freebsd4_ia32_sendsig(catcher, ksi, mask); 571 return; 572 } 573 #endif 574 #ifdef COMPAT_43 575 if (SIGISMEMBER(psp->ps_osigset, sig)) { 576 ia32_osendsig(catcher, ksi, mask); 577 return; 578 } 579 #endif 580 mtx_assert(&psp->ps_mtx, MA_OWNED); 581 regs = td->td_frame; 582 oonstack = sigonstack(regs->tf_rsp); 583 584 if (cpu_max_ext_state_size > sizeof(struct savefpu) && use_xsave) { 585 xfpusave_len = cpu_max_ext_state_size - sizeof(struct savefpu); 586 xfpusave = __builtin_alloca(xfpusave_len); 587 } else { 588 xfpusave_len = 0; 589 xfpusave = NULL; 590 } 591 592 /* Save user context. */ 593 bzero(&sf, sizeof(sf)); 594 sf.sf_uc.uc_sigmask = *mask; 595 sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp; 596 sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size; 597 sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK) 598 ? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE; 599 sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0; 600 sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi; 601 sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi; 602 sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp; 603 sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */ 604 sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx; 605 sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx; 606 sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx; 607 sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax; 608 sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno; 609 sf.sf_uc.uc_mcontext.mc_err = regs->tf_err; 610 sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip; 611 sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs; 612 sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags; 613 sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp; 614 sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss; 615 sf.sf_uc.uc_mcontext.mc_ds = regs->tf_ds; 616 sf.sf_uc.uc_mcontext.mc_es = regs->tf_es; 617 sf.sf_uc.uc_mcontext.mc_fs = regs->tf_fs; 618 sf.sf_uc.uc_mcontext.mc_gs = regs->tf_gs; 619 sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */ 620 ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext, xfpusave, xfpusave_len); 621 fpstate_drop(td); 622 sf.sf_uc.uc_mcontext.mc_fsbase = td->td_pcb->pcb_fsbase; 623 sf.sf_uc.uc_mcontext.mc_gsbase = td->td_pcb->pcb_gsbase; 624 625 /* Allocate space for the signal handler context. */ 626 if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack && 627 SIGISMEMBER(psp->ps_sigonstack, sig)) 628 sp = (char *)td->td_sigstk.ss_sp + td->td_sigstk.ss_size; 629 else 630 sp = (char *)regs->tf_rsp; 631 if (xfpusave != NULL) { 632 sp -= xfpusave_len; 633 sp = (char *)((unsigned long)sp & ~0x3Ful); 634 sf.sf_uc.uc_mcontext.mc_xfpustate = (register_t)sp; 635 } 636 sp -= sizeof(sf); 637 /* Align to 16 bytes. */ 638 sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF); 639 PROC_UNLOCK(p); 640 641 /* Build the argument list for the signal handler. */ 642 sf.sf_signum = sig; 643 sf.sf_ucontext = (register_t)&sfp->sf_uc; 644 bzero(&sf.sf_si, sizeof(sf.sf_si)); 645 if (SIGISMEMBER(psp->ps_siginfo, sig)) { 646 /* Signal handler installed with SA_SIGINFO. */ 647 sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si; 648 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 649 650 /* Fill in POSIX parts */ 651 sf.sf_si = siginfo; 652 sf.sf_si.si_signo = sig; 653 } else { 654 /* Old FreeBSD-style arguments. */ 655 sf.sf_siginfo = siginfo.si_code; 656 sf.sf_addr = (u_int32_t)siginfo.si_addr; 657 sf.sf_ah = (u_int32_t)(uintptr_t)catcher; 658 } 659 mtx_unlock(&psp->ps_mtx); 660 661 /* 662 * Copy the sigframe out to the user's stack. 663 */ 664 if (copyout(&sf, sfp, sizeof(*sfp)) != 0 || 665 (xfpusave != NULL && copyout(xfpusave, 666 PTRIN(sf.sf_uc.uc_mcontext.mc_xfpustate), xfpusave_len) 667 != 0)) { 668 #ifdef DEBUG 669 printf("process %ld has trashed its stack\n", (long)p->p_pid); 670 #endif 671 PROC_LOCK(p); 672 sigexit(td, SIGILL); 673 } 674 675 regs->tf_rsp = (uintptr_t)sfp; 676 regs->tf_rip = p->p_sysent->sv_sigcode_base; 677 regs->tf_rflags &= ~(PSL_T | PSL_D); 678 regs->tf_cs = _ucode32sel; 679 regs->tf_ss = _udatasel; 680 regs->tf_ds = _udatasel; 681 regs->tf_es = _udatasel; 682 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 683 /* XXXKIB leave user %fs and %gs untouched */ 684 PROC_LOCK(p); 685 mtx_lock(&psp->ps_mtx); 686 } 687 688 /* 689 * System call to cleanup state after a signal 690 * has been taken. Reset signal mask and 691 * stack state from context left by sendsig (above). 692 * Return to previous pc and psl as specified by 693 * context left by sendsig. Check carefully to 694 * make sure that the user has not modified the 695 * state to gain improper privileges. 696 */ 697 698 #ifdef COMPAT_43 699 int 700 ofreebsd32_sigreturn(struct thread *td, struct ofreebsd32_sigreturn_args *uap) 701 { 702 struct ia32_sigcontext3 sc, *scp; 703 struct trapframe *regs; 704 int eflags, error; 705 ksiginfo_t ksi; 706 707 regs = td->td_frame; 708 error = copyin(uap->sigcntxp, &sc, sizeof(sc)); 709 if (error != 0) 710 return (error); 711 scp = ≻ 712 eflags = scp->sc_eflags; 713 if (!EFL_SECURE(eflags, regs->tf_rflags)) { 714 return (EINVAL); 715 } 716 if (!CS_SECURE(scp->sc_cs)) { 717 ksiginfo_init_trap(&ksi); 718 ksi.ksi_signo = SIGBUS; 719 ksi.ksi_code = BUS_OBJERR; 720 ksi.ksi_trapno = T_PROTFLT; 721 ksi.ksi_addr = (void *)regs->tf_rip; 722 trapsignal(td, &ksi); 723 return (EINVAL); 724 } 725 regs->tf_ds = scp->sc_ds; 726 regs->tf_es = scp->sc_es; 727 regs->tf_fs = scp->sc_fs; 728 regs->tf_gs = scp->sc_gs; 729 730 regs->tf_rax = scp->sc_eax; 731 regs->tf_rbx = scp->sc_ebx; 732 regs->tf_rcx = scp->sc_ecx; 733 regs->tf_rdx = scp->sc_edx; 734 regs->tf_rsi = scp->sc_esi; 735 regs->tf_rdi = scp->sc_edi; 736 regs->tf_cs = scp->sc_cs; 737 regs->tf_ss = scp->sc_ss; 738 regs->tf_rbp = scp->sc_ebp; 739 regs->tf_rsp = scp->sc_esp; 740 regs->tf_rip = scp->sc_eip; 741 regs->tf_rflags = eflags; 742 743 if (scp->sc_onstack & 1) 744 td->td_sigstk.ss_flags |= SS_ONSTACK; 745 else 746 td->td_sigstk.ss_flags &= ~SS_ONSTACK; 747 748 kern_sigprocmask(td, SIG_SETMASK, (sigset_t *)&scp->sc_mask, NULL, 749 SIGPROCMASK_OLD); 750 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 751 return (EJUSTRETURN); 752 } 753 #endif 754 755 #ifdef COMPAT_FREEBSD4 756 /* 757 * MPSAFE 758 */ 759 int 760 freebsd4_freebsd32_sigreturn(td, uap) 761 struct thread *td; 762 struct freebsd4_freebsd32_sigreturn_args /* { 763 const struct freebsd4_freebsd32_ucontext *sigcntxp; 764 } */ *uap; 765 { 766 struct ia32_ucontext4 uc; 767 struct trapframe *regs; 768 struct ia32_ucontext4 *ucp; 769 int cs, eflags, error; 770 ksiginfo_t ksi; 771 772 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 773 if (error != 0) 774 return (error); 775 ucp = &uc; 776 regs = td->td_frame; 777 eflags = ucp->uc_mcontext.mc_eflags; 778 /* 779 * Don't allow users to change privileged or reserved flags. 780 */ 781 if (!EFL_SECURE(eflags, regs->tf_rflags)) { 782 uprintf("pid %d (%s): freebsd4_freebsd32_sigreturn eflags = 0x%x\n", 783 td->td_proc->p_pid, td->td_name, eflags); 784 return (EINVAL); 785 } 786 787 /* 788 * Don't allow users to load a valid privileged %cs. Let the 789 * hardware check for invalid selectors, excess privilege in 790 * other selectors, invalid %eip's and invalid %esp's. 791 */ 792 cs = ucp->uc_mcontext.mc_cs; 793 if (!CS_SECURE(cs)) { 794 uprintf("pid %d (%s): freebsd4_sigreturn cs = 0x%x\n", 795 td->td_proc->p_pid, td->td_name, cs); 796 ksiginfo_init_trap(&ksi); 797 ksi.ksi_signo = SIGBUS; 798 ksi.ksi_code = BUS_OBJERR; 799 ksi.ksi_trapno = T_PROTFLT; 800 ksi.ksi_addr = (void *)regs->tf_rip; 801 trapsignal(td, &ksi); 802 return (EINVAL); 803 } 804 805 regs->tf_rdi = ucp->uc_mcontext.mc_edi; 806 regs->tf_rsi = ucp->uc_mcontext.mc_esi; 807 regs->tf_rbp = ucp->uc_mcontext.mc_ebp; 808 regs->tf_rbx = ucp->uc_mcontext.mc_ebx; 809 regs->tf_rdx = ucp->uc_mcontext.mc_edx; 810 regs->tf_rcx = ucp->uc_mcontext.mc_ecx; 811 regs->tf_rax = ucp->uc_mcontext.mc_eax; 812 regs->tf_trapno = ucp->uc_mcontext.mc_trapno; 813 regs->tf_err = ucp->uc_mcontext.mc_err; 814 regs->tf_rip = ucp->uc_mcontext.mc_eip; 815 regs->tf_cs = cs; 816 regs->tf_rflags = ucp->uc_mcontext.mc_eflags; 817 regs->tf_rsp = ucp->uc_mcontext.mc_esp; 818 regs->tf_ss = ucp->uc_mcontext.mc_ss; 819 regs->tf_ds = ucp->uc_mcontext.mc_ds; 820 regs->tf_es = ucp->uc_mcontext.mc_es; 821 regs->tf_fs = ucp->uc_mcontext.mc_fs; 822 regs->tf_gs = ucp->uc_mcontext.mc_gs; 823 824 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 825 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 826 return (EJUSTRETURN); 827 } 828 #endif /* COMPAT_FREEBSD4 */ 829 830 /* 831 * MPSAFE 832 */ 833 int 834 freebsd32_sigreturn(td, uap) 835 struct thread *td; 836 struct freebsd32_sigreturn_args /* { 837 const struct freebsd32_ucontext *sigcntxp; 838 } */ *uap; 839 { 840 struct ia32_ucontext uc; 841 struct trapframe *regs; 842 struct ia32_ucontext *ucp; 843 char *xfpustate; 844 size_t xfpustate_len; 845 int cs, eflags, error, ret; 846 ksiginfo_t ksi; 847 848 error = copyin(uap->sigcntxp, &uc, sizeof(uc)); 849 if (error != 0) 850 return (error); 851 ucp = &uc; 852 regs = td->td_frame; 853 eflags = ucp->uc_mcontext.mc_eflags; 854 /* 855 * Don't allow users to change privileged or reserved flags. 856 */ 857 if (!EFL_SECURE(eflags, regs->tf_rflags)) { 858 uprintf("pid %d (%s): freebsd32_sigreturn eflags = 0x%x\n", 859 td->td_proc->p_pid, td->td_name, eflags); 860 return (EINVAL); 861 } 862 863 /* 864 * Don't allow users to load a valid privileged %cs. Let the 865 * hardware check for invalid selectors, excess privilege in 866 * other selectors, invalid %eip's and invalid %esp's. 867 */ 868 cs = ucp->uc_mcontext.mc_cs; 869 if (!CS_SECURE(cs)) { 870 uprintf("pid %d (%s): sigreturn cs = 0x%x\n", 871 td->td_proc->p_pid, td->td_name, cs); 872 ksiginfo_init_trap(&ksi); 873 ksi.ksi_signo = SIGBUS; 874 ksi.ksi_code = BUS_OBJERR; 875 ksi.ksi_trapno = T_PROTFLT; 876 ksi.ksi_addr = (void *)regs->tf_rip; 877 trapsignal(td, &ksi); 878 return (EINVAL); 879 } 880 881 if ((ucp->uc_mcontext.mc_flags & _MC_HASFPXSTATE) != 0) { 882 xfpustate_len = uc.uc_mcontext.mc_xfpustate_len; 883 if (xfpustate_len > cpu_max_ext_state_size - 884 sizeof(struct savefpu)) { 885 uprintf("pid %d (%s): sigreturn xfpusave_len = 0x%zx\n", 886 td->td_proc->p_pid, td->td_name, xfpustate_len); 887 return (EINVAL); 888 } 889 xfpustate = __builtin_alloca(xfpustate_len); 890 error = copyin(PTRIN(ucp->uc_mcontext.mc_xfpustate), 891 xfpustate, xfpustate_len); 892 if (error != 0) { 893 uprintf( 894 "pid %d (%s): sigreturn copying xfpustate failed\n", 895 td->td_proc->p_pid, td->td_name); 896 return (error); 897 } 898 } else { 899 xfpustate = NULL; 900 xfpustate_len = 0; 901 } 902 ret = ia32_set_fpcontext(td, &ucp->uc_mcontext, xfpustate, 903 xfpustate_len); 904 if (ret != 0) { 905 uprintf("pid %d (%s): sigreturn set_fpcontext err %d\n", 906 td->td_proc->p_pid, td->td_name, ret); 907 return (ret); 908 } 909 910 regs->tf_rdi = ucp->uc_mcontext.mc_edi; 911 regs->tf_rsi = ucp->uc_mcontext.mc_esi; 912 regs->tf_rbp = ucp->uc_mcontext.mc_ebp; 913 regs->tf_rbx = ucp->uc_mcontext.mc_ebx; 914 regs->tf_rdx = ucp->uc_mcontext.mc_edx; 915 regs->tf_rcx = ucp->uc_mcontext.mc_ecx; 916 regs->tf_rax = ucp->uc_mcontext.mc_eax; 917 regs->tf_trapno = ucp->uc_mcontext.mc_trapno; 918 regs->tf_err = ucp->uc_mcontext.mc_err; 919 regs->tf_rip = ucp->uc_mcontext.mc_eip; 920 regs->tf_cs = cs; 921 regs->tf_rflags = ucp->uc_mcontext.mc_eflags; 922 regs->tf_rsp = ucp->uc_mcontext.mc_esp; 923 regs->tf_ss = ucp->uc_mcontext.mc_ss; 924 regs->tf_ds = ucp->uc_mcontext.mc_ds; 925 regs->tf_es = ucp->uc_mcontext.mc_es; 926 regs->tf_fs = ucp->uc_mcontext.mc_fs; 927 regs->tf_gs = ucp->uc_mcontext.mc_gs; 928 regs->tf_flags = TF_HASSEGS; 929 930 kern_sigprocmask(td, SIG_SETMASK, &ucp->uc_sigmask, NULL, 0); 931 set_pcb_flags(td->td_pcb, PCB_FULL_IRET); 932 return (EJUSTRETURN); 933 } 934 935 /* 936 * Clear registers on exec 937 */ 938 void 939 ia32_setregs(struct thread *td, struct image_params *imgp, u_long stack) 940 { 941 struct trapframe *regs; 942 struct pcb *pcb; 943 register_t saved_rflags; 944 945 regs = td->td_frame; 946 pcb = td->td_pcb; 947 948 if (td->td_proc->p_md.md_ldt != NULL) 949 user_ldt_free(td); 950 #ifdef COMPAT_43 951 setup_lcall_gate(); 952 #endif 953 954 pcb->pcb_fsbase = 0; 955 pcb->pcb_gsbase = 0; 956 pcb->pcb_initial_fpucw = __INITIAL_FPUCW_I386__; 957 958 saved_rflags = regs->tf_rflags & PSL_T; 959 bzero((char *)regs, sizeof(struct trapframe)); 960 regs->tf_rip = imgp->entry_addr; 961 regs->tf_rsp = stack; 962 regs->tf_rflags = PSL_USER | saved_rflags; 963 regs->tf_ss = _udatasel; 964 regs->tf_cs = _ucode32sel; 965 regs->tf_rbx = imgp->ps_strings; 966 regs->tf_ds = _udatasel; 967 regs->tf_es = _udatasel; 968 regs->tf_fs = _ufssel; 969 regs->tf_gs = _ugssel; 970 regs->tf_flags = TF_HASSEGS; 971 972 fpstate_drop(td); 973 974 /* Return via doreti so that we can change to a different %cs */ 975 set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET); 976 } 977