1 /* $NetBSD: linux_misc.c,v 1.267 2024/10/01 16:41:29 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 1999, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe 9 * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center. 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Linux compatibility module. Try to deal with various Linux system calls. 35 */ 36 37 /* 38 * These functions have been moved to multiarch to allow 39 * selection of which machines include them to be 40 * determined by the individual files.linux_<arch> files. 41 * 42 * Function in multiarch: 43 * linux_sys_break : linux_break.c 44 * linux_sys_alarm : linux_misc_notalpha.c 45 * linux_sys_getresgid : linux_misc_notalpha.c 46 * linux_sys_nice : linux_misc_notalpha.c 47 * linux_sys_readdir : linux_misc_notalpha.c 48 * linux_sys_setresgid : linux_misc_notalpha.c 49 * linux_sys_time : linux_misc_notalpha.c 50 * linux_sys_utime : linux_misc_notalpha.c 51 * linux_sys_waitpid : linux_misc_notalpha.c 52 * linux_sys_old_mmap : linux_oldmmap.c 53 * linux_sys_oldolduname : linux_oldolduname.c 54 * linux_sys_oldselect : linux_oldselect.c 55 * linux_sys_olduname : linux_olduname.c 56 * linux_sys_pipe : linux_pipe.c 57 */ 58 59 #include <sys/cdefs.h> 60 __KERNEL_RCSID(0, "$NetBSD: linux_misc.c,v 1.267 2024/10/01 16:41:29 riastradh Exp $"); 61 62 #include <sys/param.h> 63 #include <sys/systm.h> 64 #include <sys/namei.h> 65 #include <sys/proc.h> 66 #include <sys/dirent.h> 67 #include <sys/epoll.h> 68 #include <sys/eventfd.h> 69 #include <sys/file.h> 70 #include <sys/stat.h> 71 #include <sys/filedesc.h> 72 #include <sys/ioctl.h> 73 #include <sys/kernel.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/mman.h> 77 #include <sys/mount.h> 78 #include <sys/poll.h> 79 #include <sys/prot.h> 80 #include <sys/reboot.h> 81 #include <sys/resource.h> 82 #include <sys/resourcevar.h> 83 #include <sys/select.h> 84 #include <sys/signal.h> 85 #include <sys/signalvar.h> 86 #include <sys/socket.h> 87 #include <sys/time.h> 88 #include <sys/times.h> 89 #include <sys/vnode.h> 90 #include <sys/uio.h> 91 #include <sys/wait.h> 92 #include <sys/utsname.h> 93 #include <sys/unistd.h> 94 #include <sys/vfs_syscalls.h> 95 #include <sys/swap.h> /* for SWAP_ON */ 96 #include <sys/sysctl.h> /* for KERN_DOMAINNAME */ 97 #include <sys/kauth.h> 98 #include <sys/futex.h> 99 100 #include <sys/ptrace.h> 101 #include <machine/ptrace.h> 102 103 #include <sys/syscall.h> 104 #include <sys/syscallargs.h> 105 106 #include <compat/sys/resource.h> 107 108 #include <compat/linux/common/linux_machdep.h> 109 #include <compat/linux/common/linux_types.h> 110 #include <compat/linux/common/linux_signal.h> 111 #include <compat/linux/common/linux_ipc.h> 112 #include <compat/linux/common/linux_sem.h> 113 114 #include <compat/linux/common/linux_fcntl.h> 115 #include <compat/linux/common/linux_mmap.h> 116 #include <compat/linux/common/linux_dirent.h> 117 #include <compat/linux/common/linux_util.h> 118 #include <compat/linux/common/linux_misc.h> 119 #include <compat/linux/common/linux_statfs.h> 120 #include <compat/linux/common/linux_limit.h> 121 #include <compat/linux/common/linux_ptrace.h> 122 #include <compat/linux/common/linux_reboot.h> 123 #include <compat/linux/common/linux_emuldata.h> 124 #include <compat/linux/common/linux_sched.h> 125 126 #include <compat/linux/linux_syscallargs.h> 127 128 const int linux_ptrace_request_map[] = { 129 LINUX_PTRACE_TRACEME, PT_TRACE_ME, 130 LINUX_PTRACE_PEEKTEXT, PT_READ_I, 131 LINUX_PTRACE_PEEKDATA, PT_READ_D, 132 LINUX_PTRACE_POKETEXT, PT_WRITE_I, 133 LINUX_PTRACE_POKEDATA, PT_WRITE_D, 134 LINUX_PTRACE_CONT, PT_CONTINUE, 135 LINUX_PTRACE_KILL, PT_KILL, 136 LINUX_PTRACE_ATTACH, PT_ATTACH, 137 LINUX_PTRACE_DETACH, PT_DETACH, 138 # ifdef PT_STEP 139 LINUX_PTRACE_SINGLESTEP, PT_STEP, 140 # endif 141 LINUX_PTRACE_SYSCALL, PT_SYSCALL, 142 -1 143 }; 144 145 const struct linux_mnttypes linux_fstypes[] = { 146 { MOUNT_FFS, LINUX_DEFAULT_SUPER_MAGIC }, 147 { MOUNT_NFS, LINUX_NFS_SUPER_MAGIC }, 148 { MOUNT_MFS, LINUX_DEFAULT_SUPER_MAGIC }, 149 { MOUNT_MSDOS, LINUX_MSDOS_SUPER_MAGIC }, 150 { MOUNT_LFS, LINUX_DEFAULT_SUPER_MAGIC }, 151 { MOUNT_FDESC, LINUX_DEFAULT_SUPER_MAGIC }, 152 { MOUNT_NULL, LINUX_DEFAULT_SUPER_MAGIC }, 153 { MOUNT_OVERLAY, LINUX_DEFAULT_SUPER_MAGIC }, 154 { MOUNT_UMAP, LINUX_DEFAULT_SUPER_MAGIC }, 155 { MOUNT_KERNFS, LINUX_DEFAULT_SUPER_MAGIC }, 156 { MOUNT_PROCFS, LINUX_PROC_SUPER_MAGIC }, 157 { MOUNT_AFS, LINUX_DEFAULT_SUPER_MAGIC }, 158 { MOUNT_CD9660, LINUX_ISOFS_SUPER_MAGIC }, 159 { MOUNT_UNION, LINUX_DEFAULT_SUPER_MAGIC }, 160 { MOUNT_ADOSFS, LINUX_ADFS_SUPER_MAGIC }, 161 { MOUNT_EXT2FS, LINUX_EXT2_SUPER_MAGIC }, 162 { MOUNT_CFS, LINUX_DEFAULT_SUPER_MAGIC }, 163 { MOUNT_CODA, LINUX_CODA_SUPER_MAGIC }, 164 { MOUNT_FILECORE, LINUX_DEFAULT_SUPER_MAGIC }, 165 { MOUNT_NTFS, LINUX_DEFAULT_SUPER_MAGIC }, 166 { MOUNT_SMBFS, LINUX_SMB_SUPER_MAGIC }, 167 { MOUNT_PTYFS, LINUX_DEVPTS_SUPER_MAGIC }, 168 { MOUNT_TMPFS, LINUX_TMPFS_SUPER_MAGIC } 169 }; 170 const int linux_fstypes_cnt = sizeof(linux_fstypes) / sizeof(linux_fstypes[0]); 171 172 #ifdef DEBUG_LINUX 173 #define DPRINTF(a, ...) uprintf(a, __VA_ARGS__) 174 #else 175 #define DPRINTF(a, ...) 176 #endif 177 178 /* Local linux_misc.c functions: */ 179 static void linux_to_bsd_mmap_args(struct sys_mmap_args *, 180 const struct linux_sys_mmap_args *); 181 static int linux_mmap(struct lwp *, const struct linux_sys_mmap_args *, 182 register_t *, off_t); 183 static int linux_to_native_wait_options(int); 184 185 /* 186 * The information on a terminated (or stopped) process needs 187 * to be converted in order for Linux binaries to get a valid signal 188 * number out of it. 189 */ 190 int 191 bsd_to_linux_wstat(int st) 192 { 193 194 int sig; 195 196 if (WIFSIGNALED(st)) { 197 sig = WTERMSIG(st); 198 if (sig >= 0 && sig < NSIG) 199 st= (st & ~0177) | native_to_linux_signo[sig]; 200 } else if (WIFSTOPPED(st)) { 201 sig = WSTOPSIG(st); 202 if (sig >= 0 && sig < NSIG) 203 st = (st & ~0xff00) | 204 (native_to_linux_signo[sig] << 8); 205 } 206 return st; 207 } 208 209 /* 210 * wait4(2). Passed on to the NetBSD call, surrounded by code to 211 * reserve some space for a NetBSD-style wait status, and converting 212 * it to what Linux wants. 213 */ 214 int 215 linux_sys_wait4(struct lwp *l, const struct linux_sys_wait4_args *uap, register_t *retval) 216 { 217 /* { 218 syscallarg(int) pid; 219 syscallarg(int *) status; 220 syscallarg(int) options; 221 syscallarg(struct rusage50 *) rusage; 222 } */ 223 int error, status, options, linux_options, pid = SCARG(uap, pid); 224 struct rusage50 ru50; 225 struct rusage ru; 226 proc_t *p; 227 228 linux_options = SCARG(uap, options); 229 if (linux_options & ~(LINUX_WAIT4_KNOWNFLAGS)) 230 return (EINVAL); 231 232 options = linux_to_native_wait_options(linux_options); 233 # ifdef DIAGNOSTIC 234 if (linux_options & LINUX_WNOTHREAD) 235 printf("WARNING: %s: linux process %d.%d called " 236 "waitpid with __WNOTHREAD set!\n", 237 __FILE__, l->l_proc->p_pid, l->l_lid); 238 239 # endif 240 241 error = do_sys_wait(&pid, &status, options, 242 SCARG(uap, rusage) != NULL ? &ru : NULL); 243 244 retval[0] = pid; 245 if (pid == 0) 246 return error; 247 248 p = curproc; 249 mutex_enter(p->p_lock); 250 sigdelset(&p->p_sigpend.sp_set, SIGCHLD); /* XXXAD ksiginfo leak */ 251 mutex_exit(p->p_lock); 252 253 if (SCARG(uap, rusage) != NULL) { 254 rusage_to_rusage50(&ru, &ru50); 255 error = copyout(&ru, SCARG(uap, rusage), sizeof(ru)); 256 } 257 258 if (error == 0 && SCARG(uap, status) != NULL) { 259 status = bsd_to_linux_wstat(status); 260 error = copyout(&status, SCARG(uap, status), sizeof status); 261 } 262 263 return error; 264 } 265 266 /* 267 * waitid(2). Converting arguments to the NetBSD equivalent and 268 * calling it. 269 */ 270 int 271 linux_sys_waitid(struct lwp *l, const struct linux_sys_waitid_args *uap, register_t *retval) 272 { 273 /* { 274 syscallarg(int) idtype; 275 syscallarg(id_t) id; 276 syscallarg(linux_siginfo_t *) infop; 277 syscallarg(int) options; 278 syscallarg(struct rusage50 *) rusage; 279 } */ 280 int error, linux_options, options, linux_idtype, status; 281 pid_t pid; 282 idtype_t idtype; 283 id_t id; 284 siginfo_t info; 285 linux_siginfo_t linux_info; 286 struct wrusage wru; 287 struct rusage50 ru50; 288 289 linux_idtype = SCARG(uap, idtype); 290 switch (linux_idtype) { 291 case LINUX_P_ALL: 292 idtype = P_ALL; 293 break; 294 case LINUX_P_PID: 295 idtype = P_PID; 296 break; 297 case LINUX_P_PGID: 298 idtype = P_PGID; 299 break; 300 case LINUX_P_PIDFD: 301 return EOPNOTSUPP; 302 default: 303 return EINVAL; 304 } 305 306 linux_options = SCARG(uap, options); 307 if (linux_options & ~(LINUX_WAITID_KNOWNFLAGS)) 308 return EINVAL; 309 310 options = linux_to_native_wait_options(linux_options); 311 id = SCARG(uap, id); 312 313 error = do_sys_waitid(idtype, id, &pid, &status, options, &wru, &info); 314 if (pid == 0 && options & WNOHANG) { 315 info.si_signo = 0; 316 info.si_pid = 0; 317 } 318 319 if (error == 0 && SCARG(uap, infop) != NULL) { 320 /* POSIX says that this NULL check is a bug, but Linux does this. */ 321 native_to_linux_siginfo(&linux_info, &info._info); 322 error = copyout(&linux_info, SCARG(uap, infop), sizeof(linux_info)); 323 } 324 325 if (error == 0 && SCARG(uap, rusage) != NULL) { 326 rusage_to_rusage50(&wru.wru_children, &ru50); 327 error = copyout(&ru50, SCARG(uap, rusage), sizeof(ru50)); 328 } 329 330 return error; 331 } 332 333 /* 334 * Convert the options argument for wait4(2) and waitid(2) from what 335 * Linux wants to what NetBSD wants. 336 */ 337 static int 338 linux_to_native_wait_options(int linux_options) 339 { 340 int options = 0; 341 342 if (linux_options & LINUX_WNOHANG) 343 options |= WNOHANG; 344 if (linux_options & LINUX_WUNTRACED) 345 options |= WUNTRACED; 346 if (linux_options & LINUX_WEXITED) 347 options |= WEXITED; 348 if (linux_options & LINUX_WCONTINUED) 349 options |= WCONTINUED; 350 if (linux_options & LINUX_WNOWAIT) 351 options |= WNOWAIT; 352 if (linux_options & LINUX_WALL) 353 options |= WALLSIG; 354 if (linux_options & LINUX_WCLONE) 355 options |= WALTSIG; 356 357 return options; 358 } 359 360 /* 361 * Linux brk(2). Like native, but always return the new break value. 362 */ 363 int 364 linux_sys_brk(struct lwp *l, const struct linux_sys_brk_args *uap, register_t *retval) 365 { 366 /* { 367 syscallarg(char *) nsize; 368 } */ 369 struct proc *p = l->l_proc; 370 struct vmspace *vm = p->p_vmspace; 371 struct sys_obreak_args oba; 372 373 SCARG(&oba, nsize) = SCARG(uap, nsize); 374 375 (void) sys_obreak(l, &oba, retval); 376 retval[0] = (register_t)((char *)vm->vm_daddr + ptoa(vm->vm_dsize)); 377 return 0; 378 } 379 380 /* 381 * Implement the fs stat functions. Straightforward. 382 */ 383 int 384 linux_sys_statfs(struct lwp *l, const struct linux_sys_statfs_args *uap, register_t *retval) 385 { 386 /* { 387 syscallarg(const char *) path; 388 syscallarg(struct linux_statfs *) sp; 389 } */ 390 struct statvfs *sb; 391 struct linux_statfs ltmp; 392 int error; 393 394 sb = STATVFSBUF_GET(); 395 error = do_sys_pstatvfs(l, SCARG(uap, path), ST_WAIT, sb); 396 if (error == 0) { 397 bsd_to_linux_statfs(sb, <mp); 398 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 399 } 400 STATVFSBUF_PUT(sb); 401 402 return error; 403 } 404 405 int 406 linux_sys_fstatfs(struct lwp *l, const struct linux_sys_fstatfs_args *uap, register_t *retval) 407 { 408 /* { 409 syscallarg(int) fd; 410 syscallarg(struct linux_statfs *) sp; 411 } */ 412 struct statvfs *sb; 413 struct linux_statfs ltmp; 414 int error; 415 416 sb = STATVFSBUF_GET(); 417 error = do_sys_fstatvfs(l, SCARG(uap, fd), ST_WAIT, sb); 418 if (error == 0) { 419 bsd_to_linux_statfs(sb, <mp); 420 error = copyout(<mp, SCARG(uap, sp), sizeof ltmp); 421 } 422 STATVFSBUF_PUT(sb); 423 424 return error; 425 } 426 427 /* 428 * uname(). Just copy the info from the various strings stored in the 429 * kernel, and put it in the Linux utsname structure. That structure 430 * is almost the same as the NetBSD one, only it has fields 65 characters 431 * long, and an extra domainname field. 432 */ 433 int 434 linux_sys_uname(struct lwp *l, const struct linux_sys_uname_args *uap, register_t *retval) 435 { 436 /* { 437 syscallarg(struct linux_utsname *) up; 438 } */ 439 struct linux_utsname luts; 440 441 memset(&luts, 0, sizeof(luts)); 442 strlcpy(luts.l_sysname, linux_sysname, sizeof(luts.l_sysname)); 443 strlcpy(luts.l_nodename, hostname, sizeof(luts.l_nodename)); 444 strlcpy(luts.l_release, linux_release, sizeof(luts.l_release)); 445 strlcpy(luts.l_version, linux_version, sizeof(luts.l_version)); 446 strlcpy(luts.l_machine, LINUX_UNAME_ARCH, sizeof(luts.l_machine)); 447 strlcpy(luts.l_domainname, domainname, sizeof(luts.l_domainname)); 448 449 return copyout(&luts, SCARG(uap, up), sizeof(luts)); 450 } 451 452 /* Used directly on: alpha, mips, ppc, sparc, sparc64 */ 453 /* Used indirectly on: arm, i386, m68k */ 454 455 /* 456 * New type Linux mmap call. 457 * Only called directly on machines with >= 6 free regs. 458 */ 459 int 460 linux_sys_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval) 461 { 462 /* { 463 syscallarg(unsigned long) addr; 464 syscallarg(size_t) len; 465 syscallarg(int) prot; 466 syscallarg(int) flags; 467 syscallarg(int) fd; 468 syscallarg(linux_off_t) offset; 469 } */ 470 471 if (SCARG(uap, offset) & PAGE_MASK) 472 return EINVAL; 473 474 return linux_mmap(l, uap, retval, SCARG(uap, offset)); 475 } 476 477 /* 478 * Guts of most architectures' mmap64() implementations. This shares 479 * its list of arguments with linux_sys_mmap(). 480 * 481 * The difference in linux_sys_mmap2() is that "offset" is actually 482 * (offset / pagesize), not an absolute byte count. This translation 483 * to pagesize offsets is done inside glibc between the mmap64() call 484 * point, and the actual syscall. 485 */ 486 int 487 linux_sys_mmap2(struct lwp *l, const struct linux_sys_mmap2_args *uap, register_t *retval) 488 { 489 /* { 490 syscallarg(unsigned long) addr; 491 syscallarg(size_t) len; 492 syscallarg(int) prot; 493 syscallarg(int) flags; 494 syscallarg(int) fd; 495 syscallarg(linux_off_t) offset; 496 } */ 497 498 return linux_mmap(l, uap, retval, 499 ((off_t)SCARG(uap, offset)) << PAGE_SHIFT); 500 } 501 502 /* 503 * Massage arguments and call system mmap(2). 504 */ 505 static int 506 linux_mmap(struct lwp *l, const struct linux_sys_mmap_args *uap, register_t *retval, off_t offset) 507 { 508 struct sys_mmap_args cma; 509 int error; 510 size_t mmoff=0; 511 512 linux_to_bsd_mmap_args(&cma, uap); 513 SCARG(&cma, pos) = offset; 514 515 if (SCARG(uap, flags) & LINUX_MAP_GROWSDOWN) { 516 /* 517 * Request for stack-like memory segment. On linux, this 518 * works by mmap()ping (small) segment, which is automatically 519 * extended when page fault happens below the currently 520 * allocated area. We emulate this by allocating (typically 521 * bigger) segment sized at current stack size limit, and 522 * offsetting the requested and returned address accordingly. 523 * Since physical pages are only allocated on-demand, this 524 * is effectively identical. 525 */ 526 rlim_t ssl = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 527 528 if (SCARG(&cma, len) < ssl) { 529 /* Compute the address offset */ 530 mmoff = round_page(ssl) - SCARG(uap, len); 531 532 if (SCARG(&cma, addr)) 533 SCARG(&cma, addr) = (char *)SCARG(&cma, addr) - mmoff; 534 535 SCARG(&cma, len) = (size_t) ssl; 536 } 537 } 538 539 error = sys_mmap(l, &cma, retval); 540 if (error) 541 return (error); 542 543 /* Shift the returned address for stack-like segment if necessary */ 544 retval[0] += mmoff; 545 546 return (0); 547 } 548 549 static void 550 linux_to_bsd_mmap_args(struct sys_mmap_args *cma, const struct linux_sys_mmap_args *uap) 551 { 552 int flags = MAP_TRYFIXED, fl = SCARG(uap, flags); 553 554 flags |= cvtto_bsd_mask(fl, LINUX_MAP_SHARED, MAP_SHARED); 555 flags |= cvtto_bsd_mask(fl, LINUX_MAP_PRIVATE, MAP_PRIVATE); 556 flags |= cvtto_bsd_mask(fl, LINUX_MAP_FIXED, MAP_FIXED); 557 flags |= cvtto_bsd_mask(fl, LINUX_MAP_ANON, MAP_ANON); 558 flags |= cvtto_bsd_mask(fl, LINUX_MAP_LOCKED, MAP_WIRED); 559 /* XXX XAX ERH: Any other flags here? There are more defined... */ 560 561 SCARG(cma, addr) = (void *)SCARG(uap, addr); 562 SCARG(cma, len) = SCARG(uap, len); 563 SCARG(cma, prot) = SCARG(uap, prot); 564 if (SCARG(cma, prot) & VM_PROT_WRITE) /* XXX */ 565 SCARG(cma, prot) |= VM_PROT_READ; 566 SCARG(cma, flags) = flags; 567 SCARG(cma, fd) = flags & MAP_ANON ? -1 : SCARG(uap, fd); 568 SCARG(cma, PAD) = 0; 569 } 570 571 #define LINUX_MREMAP_MAYMOVE 1 572 #define LINUX_MREMAP_FIXED 2 573 574 int 575 linux_sys_mremap(struct lwp *l, const struct linux_sys_mremap_args *uap, register_t *retval) 576 { 577 /* { 578 syscallarg(void *) old_address; 579 syscallarg(size_t) old_size; 580 syscallarg(size_t) new_size; 581 syscallarg(u_long) flags; 582 } */ 583 584 struct proc *p; 585 struct vm_map *map; 586 vaddr_t oldva; 587 vaddr_t newva; 588 size_t oldsize; 589 size_t newsize; 590 int flags; 591 int uvmflags; 592 int error; 593 594 flags = SCARG(uap, flags); 595 oldva = (vaddr_t)SCARG(uap, old_address); 596 oldsize = round_page(SCARG(uap, old_size)); 597 newsize = round_page(SCARG(uap, new_size)); 598 if ((flags & ~(LINUX_MREMAP_FIXED|LINUX_MREMAP_MAYMOVE)) != 0) { 599 error = EINVAL; 600 goto done; 601 } 602 if ((flags & LINUX_MREMAP_FIXED) != 0) { 603 if ((flags & LINUX_MREMAP_MAYMOVE) == 0) { 604 error = EINVAL; 605 goto done; 606 } 607 #if 0 /* notyet */ 608 newva = SCARG(uap, new_address); 609 uvmflags = MAP_FIXED; 610 #else /* notyet */ 611 error = EOPNOTSUPP; 612 goto done; 613 #endif /* notyet */ 614 } else if ((flags & LINUX_MREMAP_MAYMOVE) != 0) { 615 uvmflags = 0; 616 } else { 617 newva = oldva; 618 uvmflags = MAP_FIXED; 619 } 620 p = l->l_proc; 621 map = &p->p_vmspace->vm_map; 622 error = uvm_mremap(map, oldva, oldsize, map, &newva, newsize, p, 623 uvmflags); 624 625 done: 626 *retval = (error != 0) ? 0 : (register_t)newva; 627 return error; 628 } 629 630 #ifdef USRSTACK 631 int 632 linux_sys_mprotect(struct lwp *l, const struct linux_sys_mprotect_args *uap, register_t *retval) 633 { 634 /* { 635 syscallarg(const void *) start; 636 syscallarg(unsigned long) len; 637 syscallarg(int) prot; 638 } */ 639 struct vm_map_entry *entry; 640 struct vm_map *map; 641 struct proc *p; 642 vaddr_t end, start, len, stacklim; 643 int prot, grows; 644 645 start = (vaddr_t)SCARG(uap, start); 646 len = round_page(SCARG(uap, len)); 647 prot = SCARG(uap, prot); 648 grows = prot & (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP); 649 prot &= ~grows; 650 end = start + len; 651 652 if (start & PAGE_MASK) 653 return EINVAL; 654 if (end < start) 655 return EINVAL; 656 if (end == start) 657 return 0; 658 659 if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) 660 return EINVAL; 661 if (grows == (LINUX_PROT_GROWSDOWN | LINUX_PROT_GROWSUP)) 662 return EINVAL; 663 664 p = l->l_proc; 665 map = &p->p_vmspace->vm_map; 666 vm_map_lock(map); 667 # ifdef notdef 668 VM_MAP_RANGE_CHECK(map, start, end); 669 # endif 670 if (!uvm_map_lookup_entry(map, start, &entry) || entry->start > start) { 671 vm_map_unlock(map); 672 return ENOMEM; 673 } 674 675 /* 676 * Approximate the behaviour of PROT_GROWS{DOWN,UP}. 677 */ 678 679 stacklim = (vaddr_t)p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur; 680 if (grows & LINUX_PROT_GROWSDOWN) { 681 if (USRSTACK - stacklim <= start && start < USRSTACK) { 682 start = USRSTACK - stacklim; 683 } else { 684 start = entry->start; 685 } 686 } else if (grows & LINUX_PROT_GROWSUP) { 687 if (USRSTACK <= end && end < USRSTACK + stacklim) { 688 end = USRSTACK + stacklim; 689 } else { 690 end = entry->end; 691 } 692 } 693 vm_map_unlock(map); 694 return uvm_map_protect_user(l, start, end, prot); 695 } 696 #endif /* USRSTACK */ 697 698 /* 699 * This code is partly stolen from src/lib/libc/compat-43/times.c 700 */ 701 702 #define CONVTCK(r) (r.tv_sec * hz + r.tv_usec / (1000000 / hz)) 703 704 int 705 linux_sys_times(struct lwp *l, const struct linux_sys_times_args *uap, register_t *retval) 706 { 707 /* { 708 syscallarg(struct times *) tms; 709 } */ 710 struct proc *p = l->l_proc; 711 struct timeval t; 712 int error; 713 714 if (SCARG(uap, tms)) { 715 struct linux_tms ltms; 716 struct rusage ru; 717 718 memset(<ms, 0, sizeof(ltms)); 719 720 mutex_enter(p->p_lock); 721 calcru(p, &ru.ru_utime, &ru.ru_stime, NULL, NULL); 722 ltms.ltms_utime = CONVTCK(ru.ru_utime); 723 ltms.ltms_stime = CONVTCK(ru.ru_stime); 724 ltms.ltms_cutime = CONVTCK(p->p_stats->p_cru.ru_utime); 725 ltms.ltms_cstime = CONVTCK(p->p_stats->p_cru.ru_stime); 726 mutex_exit(p->p_lock); 727 728 if ((error = copyout(<ms, SCARG(uap, tms), sizeof ltms))) 729 return error; 730 } 731 732 getmicrouptime(&t); 733 734 retval[0] = ((linux_clock_t)(CONVTCK(t))); 735 return 0; 736 } 737 738 #undef CONVTCK 739 740 #if !defined(__aarch64__) 741 /* 742 * Linux 'readdir' call. This code is mostly taken from the 743 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 744 * an attempt has been made to keep it a little cleaner (failing 745 * miserably, because of the cruft needed if count 1 is passed). 746 * 747 * The d_off field should contain the offset of the next valid entry, 748 * but in Linux it has the offset of the entry itself. We emulate 749 * that bug here. 750 * 751 * Read in BSD-style entries, convert them, and copy them out. 752 * 753 * Note that this doesn't handle union-mounted filesystems. 754 */ 755 int 756 linux_sys_getdents(struct lwp *l, const struct linux_sys_getdents_args *uap, register_t *retval) 757 { 758 /* { 759 syscallarg(int) fd; 760 syscallarg(struct linux_dirent *) dent; 761 syscallarg(unsigned int) count; 762 } */ 763 struct dirent *bdp; 764 struct vnode *vp; 765 char *inp, *tbuf; /* BSD-format */ 766 int len, reclen; /* BSD-format */ 767 char *outp; /* Linux-format */ 768 int resid, linux_reclen = 0; /* Linux-format */ 769 struct file *fp; 770 struct uio auio; 771 struct iovec aiov; 772 struct linux_dirent idb; 773 off_t off; /* true file offset */ 774 int buflen, error, eofflag, nbytes, oldcall; 775 struct vattr va; 776 off_t *cookiebuf = NULL, *cookie; 777 int ncookies; 778 779 /* fd_getvnode() will use the descriptor for us */ 780 if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) 781 return (error); 782 783 if ((fp->f_flag & FREAD) == 0) { 784 error = EBADF; 785 goto out1; 786 } 787 788 vp = (struct vnode *)fp->f_data; 789 if (vp->v_type != VDIR) { 790 error = ENOTDIR; 791 goto out1; 792 } 793 794 vn_lock(vp, LK_SHARED | LK_RETRY); 795 error = VOP_GETATTR(vp, &va, l->l_cred); 796 VOP_UNLOCK(vp); 797 if (error) 798 goto out1; 799 800 nbytes = SCARG(uap, count); 801 if (nbytes == 1) { /* emulating old, broken behaviour */ 802 nbytes = sizeof (idb); 803 buflen = uimax(va.va_blocksize, nbytes); 804 oldcall = 1; 805 } else { 806 buflen = uimin(MAXBSIZE, nbytes); 807 if (buflen < va.va_blocksize) 808 buflen = va.va_blocksize; 809 oldcall = 0; 810 } 811 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 812 813 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 814 off = fp->f_offset; 815 again: 816 aiov.iov_base = tbuf; 817 aiov.iov_len = buflen; 818 auio.uio_iov = &aiov; 819 auio.uio_iovcnt = 1; 820 auio.uio_rw = UIO_READ; 821 auio.uio_resid = buflen; 822 auio.uio_offset = off; 823 UIO_SETUP_SYSSPACE(&auio); 824 /* 825 * First we read into the malloc'ed buffer, then 826 * we massage it into user space, one record at a time. 827 */ 828 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 829 &ncookies); 830 if (error) 831 goto out; 832 833 inp = tbuf; 834 outp = (void *)SCARG(uap, dent); 835 resid = nbytes; 836 if ((len = buflen - auio.uio_resid) == 0) 837 goto eof; 838 839 for (cookie = cookiebuf; len > 0; len -= reclen) { 840 bdp = (struct dirent *)inp; 841 reclen = bdp->d_reclen; 842 if (reclen & 3) { 843 error = EIO; 844 goto out; 845 } 846 if (bdp->d_fileno == 0) { 847 inp += reclen; /* it is a hole; squish it out */ 848 if (cookie) 849 off = *cookie++; 850 else 851 off += reclen; 852 continue; 853 } 854 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 855 if (reclen > len || resid < linux_reclen) { 856 /* entry too big for buffer, so just stop */ 857 outp++; 858 break; 859 } 860 /* 861 * Massage in place to make a Linux-shaped dirent (otherwise 862 * we have to worry about touching user memory outside of 863 * the copyout() call). 864 */ 865 memset(&idb, 0, sizeof(idb)); 866 idb.d_ino = bdp->d_fileno; 867 /* 868 * The old readdir() call misuses the offset and reclen fields. 869 */ 870 if (oldcall) { 871 idb.d_off = (linux_off_t)linux_reclen; 872 idb.d_reclen = (u_short)bdp->d_namlen; 873 } else { 874 if (sizeof (idb.d_off) <= 4 && (off >> 32) != 0) { 875 compat_offseterr(vp, "linux_getdents"); 876 error = EINVAL; 877 goto out; 878 } 879 idb.d_off = (linux_off_t)off; 880 idb.d_reclen = (u_short)linux_reclen; 881 /* Linux puts d_type at the end of each record */ 882 *((char *)&idb + idb.d_reclen - 1) = bdp->d_type; 883 } 884 memcpy(idb.d_name, bdp->d_name, 885 MIN(sizeof(idb.d_name), bdp->d_namlen + 1)); 886 if ((error = copyout((void *)&idb, outp, linux_reclen))) 887 goto out; 888 /* advance past this real entry */ 889 inp += reclen; 890 if (cookie) 891 off = *cookie++; /* each entry points to itself */ 892 else 893 off += reclen; 894 /* advance output past Linux-shaped entry */ 895 outp += linux_reclen; 896 resid -= linux_reclen; 897 if (oldcall) 898 break; 899 } 900 901 /* if we squished out the whole block, try again */ 902 if (outp == (void *)SCARG(uap, dent)) { 903 if (cookiebuf) 904 free(cookiebuf, M_TEMP); 905 cookiebuf = NULL; 906 goto again; 907 } 908 fp->f_offset = off; /* update the vnode offset */ 909 910 if (oldcall) 911 nbytes = resid + linux_reclen; 912 913 eof: 914 *retval = nbytes - resid; 915 out: 916 VOP_UNLOCK(vp); 917 if (cookiebuf) 918 free(cookiebuf, M_TEMP); 919 free(tbuf, M_TEMP); 920 out1: 921 fd_putfile(SCARG(uap, fd)); 922 return error; 923 } 924 #endif 925 926 #if !defined(__aarch64__) 927 /* 928 * Even when just using registers to pass arguments to syscalls you can 929 * have 5 of them on the i386. So this newer version of select() does 930 * this. 931 */ 932 int 933 linux_sys_select(struct lwp *l, const struct linux_sys_select_args *uap, register_t *retval) 934 { 935 /* { 936 syscallarg(int) nfds; 937 syscallarg(fd_set *) readfds; 938 syscallarg(fd_set *) writefds; 939 syscallarg(fd_set *) exceptfds; 940 syscallarg(struct timeval50 *) timeout; 941 } */ 942 943 return linux_select1(l, retval, SCARG(uap, nfds), SCARG(uap, readfds), 944 SCARG(uap, writefds), SCARG(uap, exceptfds), 945 (struct linux_timeval *)SCARG(uap, timeout)); 946 } 947 948 /* 949 * Common code for the old and new versions of select(). A couple of 950 * things are important: 951 * 1) return the amount of time left in the 'timeout' parameter 952 * 2) select never returns ERESTART on Linux, always return EINTR 953 */ 954 int 955 linux_select1(struct lwp *l, register_t *retval, int nfds, fd_set *readfds, 956 fd_set *writefds, fd_set *exceptfds, struct linux_timeval *timeout) 957 { 958 struct timespec ts0, ts1, uts, *ts = NULL; 959 struct linux_timeval ltv; 960 int error; 961 962 /* 963 * Store current time for computation of the amount of 964 * time left. 965 */ 966 if (timeout) { 967 if ((error = copyin(timeout, <v, sizeof(ltv)))) 968 return error; 969 uts.tv_sec = ltv.tv_sec; 970 uts.tv_nsec = (long)((unsigned long)ltv.tv_usec * 1000); 971 if (itimespecfix(&uts)) { 972 /* 973 * The timeval was invalid. Convert it to something 974 * valid that will act as it does under Linux. 975 */ 976 uts.tv_sec += uts.tv_nsec / 1000000000; 977 uts.tv_nsec %= 1000000000; 978 if (uts.tv_nsec < 0) { 979 uts.tv_sec -= 1; 980 uts.tv_nsec += 1000000000; 981 } 982 if (uts.tv_sec < 0) 983 timespecclear(&uts); 984 } 985 ts = &uts; 986 nanotime(&ts0); 987 } 988 989 error = selcommon(retval, nfds, readfds, writefds, exceptfds, ts, NULL); 990 991 if (error) { 992 /* 993 * See fs/select.c in the Linux kernel. Without this, 994 * Maelstrom doesn't work. 995 */ 996 if (error == ERESTART) 997 error = EINTR; 998 return error; 999 } 1000 1001 if (timeout) { 1002 if (*retval) { 1003 /* 1004 * Compute how much time was left of the timeout, 1005 * by subtracting the current time and the time 1006 * before we started the call, and subtracting 1007 * that result from the user-supplied value. 1008 */ 1009 nanotime(&ts1); 1010 timespecsub(&ts1, &ts0, &ts1); 1011 timespecsub(&uts, &ts1, &uts); 1012 if (uts.tv_sec < 0) 1013 timespecclear(&uts); 1014 } else 1015 timespecclear(&uts); 1016 ltv.tv_sec = uts.tv_sec; 1017 ltv.tv_usec = uts.tv_nsec / 1000; 1018 if ((error = copyout(<v, timeout, sizeof(ltv)))) 1019 return error; 1020 } 1021 1022 return 0; 1023 } 1024 #endif 1025 1026 /* 1027 * Derived from FreeBSD's sys/compat/linux/linux_misc.c:linux_pselect6() 1028 * which was contributed by Dmitry Chagin 1029 * https://svnweb.freebsd.org/base?view=revision&revision=283403 1030 */ 1031 int 1032 linux_sys_pselect6(struct lwp *l, 1033 const struct linux_sys_pselect6_args *uap, register_t *retval) 1034 { 1035 /* { 1036 syscallarg(int) nfds; 1037 syscallarg(fd_set *) readfds; 1038 syscallarg(fd_set *) writefds; 1039 syscallarg(fd_set *) exceptfds; 1040 syscallarg(struct timespec *) timeout; 1041 syscallarg(linux_sized_sigset_t *) ss; 1042 } */ 1043 struct timespec uts, ts0, ts1, *tsp; 1044 linux_sized_sigset_t lsss; 1045 struct linux_timespec lts; 1046 linux_sigset_t lss; 1047 sigset_t *ssp; 1048 sigset_t ss; 1049 int error; 1050 1051 ssp = NULL; 1052 if (SCARG(uap, ss) != NULL) { 1053 if ((error = copyin(SCARG(uap, ss), &lsss, sizeof(lsss))) != 0) 1054 return (error); 1055 if (lsss.ss_len != sizeof(lss)) 1056 return (EINVAL); 1057 if (lsss.ss != NULL) { 1058 if ((error = copyin(lsss.ss, &lss, sizeof(lss))) != 0) 1059 return (error); 1060 linux_to_native_sigset(&ss, &lss); 1061 ssp = &ss; 1062 } 1063 } 1064 1065 if (SCARG(uap, timeout) != NULL) { 1066 error = copyin(SCARG(uap, timeout), <s, sizeof(lts)); 1067 if (error != 0) 1068 return (error); 1069 linux_to_native_timespec(&uts, <s); 1070 1071 if (itimespecfix(&uts)) 1072 return (EINVAL); 1073 1074 nanotime(&ts0); 1075 tsp = &uts; 1076 } else { 1077 tsp = NULL; 1078 } 1079 1080 error = selcommon(retval, SCARG(uap, nfds), SCARG(uap, readfds), 1081 SCARG(uap, writefds), SCARG(uap, exceptfds), tsp, ssp); 1082 1083 if (error == 0 && tsp != NULL) { 1084 if (retval != 0) { 1085 /* 1086 * Compute how much time was left of the timeout, 1087 * by subtracting the current time and the time 1088 * before we started the call, and subtracting 1089 * that result from the user-supplied value. 1090 */ 1091 nanotime(&ts1); 1092 timespecsub(&ts1, &ts0, &ts1); 1093 timespecsub(&uts, &ts1, &uts); 1094 if (uts.tv_sec < 0) 1095 timespecclear(&uts); 1096 } else { 1097 timespecclear(&uts); 1098 } 1099 1100 native_to_linux_timespec(<s, &uts); 1101 error = copyout(<s, SCARG(uap, timeout), sizeof(lts)); 1102 } 1103 1104 return (error); 1105 } 1106 1107 int 1108 linux_sys_ppoll(struct lwp *l, 1109 const struct linux_sys_ppoll_args *uap, register_t *retval) 1110 { 1111 /* { 1112 syscallarg(struct pollfd *) fds; 1113 syscallarg(u_int) nfds; 1114 syscallarg(struct linux_timespec *) timeout; 1115 syscallarg(linux_sigset_t *) sigset; 1116 } */ 1117 struct linux_timespec lts0, *lts; 1118 struct timespec ts0, *ts = NULL; 1119 linux_sigset_t lsigmask0, *lsigmask; 1120 sigset_t sigmask0, *sigmask = NULL; 1121 int error; 1122 1123 lts = SCARG(uap, timeout); 1124 if (lts) { 1125 if ((error = copyin(lts, <s0, sizeof(lts0))) != 0) 1126 return error; 1127 linux_to_native_timespec(&ts0, <s0); 1128 ts = &ts0; 1129 } 1130 1131 lsigmask = SCARG(uap, sigset); 1132 if (lsigmask) { 1133 if ((error = copyin(lsigmask, &lsigmask0, sizeof(lsigmask0)))) 1134 return error; 1135 linux_to_native_sigset(&sigmask0, &lsigmask0); 1136 sigmask = &sigmask0; 1137 } 1138 1139 return pollcommon(retval, SCARG(uap, fds), SCARG(uap, nfds), 1140 ts, sigmask); 1141 } 1142 1143 /* 1144 * Set the 'personality' (emulation mode) for the current process. Only 1145 * accept the Linux personality here (0). This call is needed because 1146 * the Linux ELF crt0 issues it in an ugly kludge to make sure that 1147 * ELF binaries run in Linux mode, not SVR4 mode. 1148 */ 1149 int 1150 linux_sys_personality(struct lwp *l, const struct linux_sys_personality_args *uap, register_t *retval) 1151 { 1152 /* { 1153 syscallarg(unsigned long) per; 1154 } */ 1155 struct linux_emuldata *led; 1156 int per; 1157 1158 per = SCARG(uap, per); 1159 led = l->l_emuldata; 1160 if (per == LINUX_PER_QUERY) { 1161 retval[0] = led->led_personality; 1162 return 0; 1163 } 1164 1165 switch (per & LINUX_PER_MASK) { 1166 case LINUX_PER_LINUX: 1167 case LINUX_PER_LINUX32: 1168 led->led_personality = per; 1169 break; 1170 1171 default: 1172 return EINVAL; 1173 } 1174 1175 retval[0] = per; 1176 return 0; 1177 } 1178 1179 /* 1180 * We have nonexistent fsuid equal to uid. 1181 * If modification is requested, refuse. 1182 */ 1183 int 1184 linux_sys_setfsuid(struct lwp *l, const struct linux_sys_setfsuid_args *uap, register_t *retval) 1185 { 1186 /* { 1187 syscallarg(uid_t) uid; 1188 } */ 1189 uid_t uid; 1190 1191 uid = SCARG(uap, uid); 1192 if (kauth_cred_getuid(l->l_cred) != uid) 1193 return sys_nosys(l, uap, retval); 1194 1195 *retval = uid; 1196 return 0; 1197 } 1198 1199 int 1200 linux_sys_setfsgid(struct lwp *l, const struct linux_sys_setfsgid_args *uap, register_t *retval) 1201 { 1202 /* { 1203 syscallarg(gid_t) gid; 1204 } */ 1205 gid_t gid; 1206 1207 gid = SCARG(uap, gid); 1208 if (kauth_cred_getgid(l->l_cred) != gid) 1209 return sys_nosys(l, uap, retval); 1210 1211 *retval = gid; 1212 return 0; 1213 } 1214 1215 int 1216 linux_sys_setresuid(struct lwp *l, const struct linux_sys_setresuid_args *uap, register_t *retval) 1217 { 1218 /* { 1219 syscallarg(uid_t) ruid; 1220 syscallarg(uid_t) euid; 1221 syscallarg(uid_t) suid; 1222 } */ 1223 1224 /* 1225 * Note: These checks are a little different than the NetBSD 1226 * setreuid(2) call performs. This precisely follows the 1227 * behavior of the Linux kernel. 1228 */ 1229 1230 return do_setresuid(l, SCARG(uap, ruid), SCARG(uap, euid), 1231 SCARG(uap, suid), 1232 ID_R_EQ_R | ID_R_EQ_E | ID_R_EQ_S | 1233 ID_E_EQ_R | ID_E_EQ_E | ID_E_EQ_S | 1234 ID_S_EQ_R | ID_S_EQ_E | ID_S_EQ_S ); 1235 } 1236 1237 int 1238 linux_sys_getresuid(struct lwp *l, const struct linux_sys_getresuid_args *uap, register_t *retval) 1239 { 1240 /* { 1241 syscallarg(uid_t *) ruid; 1242 syscallarg(uid_t *) euid; 1243 syscallarg(uid_t *) suid; 1244 } */ 1245 kauth_cred_t pc = l->l_cred; 1246 int error; 1247 uid_t uid; 1248 1249 /* 1250 * Linux copies these values out to userspace like so: 1251 * 1252 * 1. Copy out ruid. 1253 * 2. If that succeeds, copy out euid. 1254 * 3. If both of those succeed, copy out suid. 1255 */ 1256 uid = kauth_cred_getuid(pc); 1257 if ((error = copyout(&uid, SCARG(uap, ruid), sizeof(uid_t))) != 0) 1258 return (error); 1259 1260 uid = kauth_cred_geteuid(pc); 1261 if ((error = copyout(&uid, SCARG(uap, euid), sizeof(uid_t))) != 0) 1262 return (error); 1263 1264 uid = kauth_cred_getsvuid(pc); 1265 1266 return (copyout(&uid, SCARG(uap, suid), sizeof(uid_t))); 1267 } 1268 1269 int 1270 linux_sys_ptrace(struct lwp *l, const struct linux_sys_ptrace_args *uap, register_t *retval) 1271 { 1272 /* { 1273 i386, m68k, powerpc: T=int 1274 alpha, amd64: T=long 1275 syscallarg(T) request; 1276 syscallarg(T) pid; 1277 syscallarg(T) addr; 1278 syscallarg(T) data; 1279 } */ 1280 const int *ptr; 1281 int request; 1282 int error; 1283 1284 ptr = linux_ptrace_request_map; 1285 request = SCARG(uap, request); 1286 while (*ptr != -1) 1287 if (*ptr++ == request) { 1288 struct sys_ptrace_args pta; 1289 1290 SCARG(&pta, req) = *ptr; 1291 SCARG(&pta, pid) = SCARG(uap, pid); 1292 SCARG(&pta, addr) = (void *)SCARG(uap, addr); 1293 SCARG(&pta, data) = SCARG(uap, data); 1294 1295 /* 1296 * Linux ptrace(PTRACE_CONT, pid, 0, 0) means actually 1297 * to continue where the process left off previously. 1298 * The same thing is achieved by addr == (void *) 1 1299 * on NetBSD, so rewrite 'addr' appropriately. 1300 */ 1301 if (request == LINUX_PTRACE_CONT && SCARG(uap, addr)==0) 1302 SCARG(&pta, addr) = (void *) 1; 1303 1304 error = sysent[SYS_ptrace].sy_call(l, &pta, retval); 1305 if (error) 1306 return error; 1307 switch (request) { 1308 case LINUX_PTRACE_PEEKTEXT: 1309 case LINUX_PTRACE_PEEKDATA: 1310 error = copyout (retval, 1311 (void *)SCARG(uap, data), 1312 sizeof *retval); 1313 *retval = SCARG(uap, data); 1314 break; 1315 default: 1316 break; 1317 } 1318 return error; 1319 } 1320 else 1321 ptr++; 1322 1323 return LINUX_SYS_PTRACE_ARCH(l, uap, retval); 1324 } 1325 1326 int 1327 linux_sys_reboot(struct lwp *l, const struct linux_sys_reboot_args *uap, register_t *retval) 1328 { 1329 /* { 1330 syscallarg(int) magic1; 1331 syscallarg(int) magic2; 1332 syscallarg(int) cmd; 1333 syscallarg(void *) arg; 1334 } */ 1335 struct sys_reboot_args /* { 1336 syscallarg(int) opt; 1337 syscallarg(char *) bootstr; 1338 } */ sra; 1339 int error; 1340 1341 if ((error = kauth_authorize_system(l->l_cred, 1342 KAUTH_SYSTEM_REBOOT, 0, NULL, NULL, NULL)) != 0) 1343 return(error); 1344 1345 if (SCARG(uap, magic1) != LINUX_REBOOT_MAGIC1) 1346 return(EINVAL); 1347 if (SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2 && 1348 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2A && 1349 SCARG(uap, magic2) != LINUX_REBOOT_MAGIC2B) 1350 return(EINVAL); 1351 1352 switch ((unsigned long)SCARG(uap, cmd)) { 1353 case LINUX_REBOOT_CMD_RESTART: 1354 SCARG(&sra, opt) = RB_AUTOBOOT; 1355 break; 1356 case LINUX_REBOOT_CMD_HALT: 1357 SCARG(&sra, opt) = RB_HALT; 1358 break; 1359 case LINUX_REBOOT_CMD_POWER_OFF: 1360 SCARG(&sra, opt) = RB_HALT|RB_POWERDOWN; 1361 break; 1362 case LINUX_REBOOT_CMD_RESTART2: 1363 /* Reboot with an argument. */ 1364 SCARG(&sra, opt) = RB_AUTOBOOT|RB_STRING; 1365 SCARG(&sra, bootstr) = SCARG(uap, arg); 1366 break; 1367 case LINUX_REBOOT_CMD_CAD_ON: 1368 return(EINVAL); /* We don't implement ctrl-alt-delete */ 1369 case LINUX_REBOOT_CMD_CAD_OFF: 1370 return(0); 1371 default: 1372 return(EINVAL); 1373 } 1374 1375 return(sys_reboot(l, &sra, retval)); 1376 } 1377 1378 /* 1379 * Copy of compat_12_sys_swapon(). 1380 */ 1381 int 1382 linux_sys_swapon(struct lwp *l, const struct linux_sys_swapon_args *uap, register_t *retval) 1383 { 1384 /* { 1385 syscallarg(const char *) name; 1386 } */ 1387 struct sys_swapctl_args ua; 1388 1389 SCARG(&ua, cmd) = SWAP_ON; 1390 SCARG(&ua, arg) = (void *)__UNCONST(SCARG(uap, name)); 1391 SCARG(&ua, misc) = 0; /* priority */ 1392 return (sys_swapctl(l, &ua, retval)); 1393 } 1394 1395 /* 1396 * Stop swapping to the file or block device specified by path. 1397 */ 1398 int 1399 linux_sys_swapoff(struct lwp *l, const struct linux_sys_swapoff_args *uap, register_t *retval) 1400 { 1401 /* { 1402 syscallarg(const char *) path; 1403 } */ 1404 struct sys_swapctl_args ua; 1405 1406 SCARG(&ua, cmd) = SWAP_OFF; 1407 SCARG(&ua, arg) = __UNCONST(SCARG(uap, path)); /*XXXUNCONST*/ 1408 return (sys_swapctl(l, &ua, retval)); 1409 } 1410 1411 /* 1412 * Copy of compat_09_sys_setdomainname() 1413 */ 1414 /* ARGSUSED */ 1415 int 1416 linux_sys_setdomainname(struct lwp *l, const struct linux_sys_setdomainname_args *uap, register_t *retval) 1417 { 1418 /* { 1419 syscallarg(char *) domainname; 1420 syscallarg(int) len; 1421 } */ 1422 int name[2]; 1423 1424 name[0] = CTL_KERN; 1425 name[1] = KERN_DOMAINNAME; 1426 return (old_sysctl(&name[0], 2, 0, 0, SCARG(uap, domainname), 1427 SCARG(uap, len), l)); 1428 } 1429 1430 /* 1431 * sysinfo() 1432 */ 1433 /* ARGSUSED */ 1434 int 1435 linux_sys_sysinfo(struct lwp *l, const struct linux_sys_sysinfo_args *uap, register_t *retval) 1436 { 1437 /* { 1438 syscallarg(struct linux_sysinfo *) arg; 1439 } */ 1440 struct linux_sysinfo si; 1441 struct loadavg *la; 1442 int64_t filepg; 1443 1444 memset(&si, 0, sizeof(si)); 1445 si.uptime = time_uptime; 1446 la = &averunnable; 1447 si.loads[0] = la->ldavg[0] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1448 si.loads[1] = la->ldavg[1] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1449 si.loads[2] = la->ldavg[2] * LINUX_SYSINFO_LOADS_SCALE / la->fscale; 1450 si.totalram = ctob((u_long)physmem); 1451 /* uvm_availmem() may sync the counters. */ 1452 si.freeram = (u_long)uvm_availmem(true) * uvmexp.pagesize; 1453 filepg = cpu_count_get(CPU_COUNT_FILECLEAN) + 1454 cpu_count_get(CPU_COUNT_FILEDIRTY) + 1455 cpu_count_get(CPU_COUNT_FILEUNKNOWN) - 1456 cpu_count_get(CPU_COUNT_EXECPAGES); 1457 si.sharedram = 0; /* XXX */ 1458 si.bufferram = (u_long)(filepg * uvmexp.pagesize); 1459 si.totalswap = (u_long)uvmexp.swpages * uvmexp.pagesize; 1460 si.freeswap = 1461 (u_long)(uvmexp.swpages - uvmexp.swpginuse) * uvmexp.pagesize; 1462 si.procs = atomic_load_relaxed(&nprocs); 1463 1464 /* The following are only present in newer Linux kernels. */ 1465 si.totalbig = 0; 1466 si.freebig = 0; 1467 si.mem_unit = 1; 1468 1469 return (copyout(&si, SCARG(uap, arg), sizeof si)); 1470 } 1471 1472 int 1473 linux_sys_getrlimit(struct lwp *l, const struct linux_sys_getrlimit_args *uap, register_t *retval) 1474 { 1475 /* { 1476 syscallarg(int) which; 1477 # ifdef LINUX_LARGEFILE64 1478 syscallarg(struct rlimit *) rlp; 1479 # else 1480 syscallarg(struct orlimit *) rlp; 1481 # endif 1482 } */ 1483 # ifdef LINUX_LARGEFILE64 1484 struct rlimit orl; 1485 # else 1486 struct orlimit orl; 1487 # endif 1488 int which; 1489 1490 which = linux_to_bsd_limit(SCARG(uap, which)); 1491 if (which < 0) 1492 return -which; 1493 1494 memset(&orl, 0, sizeof(orl)); 1495 bsd_to_linux_rlimit(&orl, &l->l_proc->p_rlimit[which]); 1496 1497 return copyout(&orl, SCARG(uap, rlp), sizeof(orl)); 1498 } 1499 1500 int 1501 linux_sys_setrlimit(struct lwp *l, const struct linux_sys_setrlimit_args *uap, register_t *retval) 1502 { 1503 /* { 1504 syscallarg(int) which; 1505 # ifdef LINUX_LARGEFILE64 1506 syscallarg(struct rlimit *) rlp; 1507 # else 1508 syscallarg(struct orlimit *) rlp; 1509 # endif 1510 } */ 1511 struct rlimit rl; 1512 # ifdef LINUX_LARGEFILE64 1513 struct rlimit orl; 1514 # else 1515 struct orlimit orl; 1516 # endif 1517 int error; 1518 int which; 1519 1520 if ((error = copyin(SCARG(uap, rlp), &orl, sizeof(orl))) != 0) 1521 return error; 1522 1523 which = linux_to_bsd_limit(SCARG(uap, which)); 1524 if (which < 0) 1525 return -which; 1526 1527 linux_to_bsd_rlimit(&rl, &orl); 1528 return dosetrlimit(l, l->l_proc, which, &rl); 1529 } 1530 1531 # if !defined(__aarch64__) && !defined(__mips__) && !defined(__amd64__) 1532 /* XXX: this doesn't look 100% common, at least mips doesn't have it */ 1533 int 1534 linux_sys_ugetrlimit(struct lwp *l, const struct linux_sys_ugetrlimit_args *uap, register_t *retval) 1535 { 1536 return linux_sys_getrlimit(l, (const void *)uap, retval); 1537 } 1538 # endif 1539 1540 int 1541 linux_sys_prlimit64(struct lwp *l, const struct linux_sys_prlimit64_args *uap, register_t *retval) 1542 { 1543 /* { 1544 syscallarg(pid_t) pid; 1545 syscallarg(int) witch; 1546 syscallarg(struct rlimit *) new_rlp; 1547 syscallarg(struct rlimit *) old_rlp; 1548 }; */ 1549 struct rlimit rl, nrl, orl; 1550 struct rlimit *p; 1551 int which; 1552 int error; 1553 1554 /* XXX: Cannot operate any process other than its own */ 1555 if (SCARG(uap, pid) != 0) 1556 return EPERM; 1557 1558 which = linux_to_bsd_limit(SCARG(uap, which)); 1559 if (which < 0) 1560 return -which; 1561 1562 p = SCARG(uap, old_rlp); 1563 if (p != NULL) { 1564 memset(&orl, 0, sizeof(orl)); 1565 bsd_to_linux_rlimit64(&orl, &l->l_proc->p_rlimit[which]); 1566 if ((error = copyout(&orl, p, sizeof(orl))) != 0) 1567 return error; 1568 } 1569 1570 p = SCARG(uap, new_rlp); 1571 if (p != NULL) { 1572 if ((error = copyin(p, &nrl, sizeof(nrl))) != 0) 1573 return error; 1574 1575 linux_to_bsd_rlimit(&rl, &nrl); 1576 return dosetrlimit(l, l->l_proc, which, &rl); 1577 } 1578 1579 return 0; 1580 } 1581 1582 /* 1583 * This gets called for unsupported syscalls. The difference to sys_nosys() 1584 * is that process does not get SIGSYS, the call just returns with ENOSYS. 1585 * This is the way Linux does it and glibc depends on this behaviour. 1586 */ 1587 int 1588 linux_sys_nosys(struct lwp *l, const void *v, register_t *retval) 1589 { 1590 return (ENOSYS); 1591 } 1592 1593 int 1594 linux_sys_getpriority(struct lwp *l, const struct linux_sys_getpriority_args *uap, register_t *retval) 1595 { 1596 /* { 1597 syscallarg(int) which; 1598 syscallarg(int) who; 1599 } */ 1600 struct sys_getpriority_args bsa; 1601 int error; 1602 1603 SCARG(&bsa, which) = SCARG(uap, which); 1604 SCARG(&bsa, who) = SCARG(uap, who); 1605 1606 if ((error = sys_getpriority(l, &bsa, retval))) 1607 return error; 1608 1609 *retval = NZERO - *retval; 1610 1611 return 0; 1612 } 1613 1614 int 1615 linux_do_sys_utimensat(struct lwp *l, int fd, const char *path, struct timespec *tsp, int flags, register_t *retval) 1616 { 1617 int follow, error; 1618 1619 follow = (flags & LINUX_AT_SYMLINK_NOFOLLOW) ? NOFOLLOW : FOLLOW; 1620 1621 if (path == NULL && fd != AT_FDCWD) { 1622 file_t *fp; 1623 1624 /* fd_getvnode() will use the descriptor for us */ 1625 if ((error = fd_getvnode(fd, &fp)) != 0) 1626 return error; 1627 error = do_sys_utimensat(l, AT_FDCWD, fp->f_data, NULL, 0, 1628 tsp, UIO_SYSSPACE); 1629 fd_putfile(fd); 1630 return error; 1631 } 1632 1633 return do_sys_utimensat(l, fd, NULL, path, follow, tsp, UIO_SYSSPACE); 1634 } 1635 1636 int 1637 linux_sys_utimensat(struct lwp *l, const struct linux_sys_utimensat_args *uap, 1638 register_t *retval) 1639 { 1640 /* { 1641 syscallarg(int) fd; 1642 syscallarg(const char *) path; 1643 syscallarg(const struct linux_timespec *) times; 1644 syscallarg(int) flag; 1645 } */ 1646 int error; 1647 struct linux_timespec lts[2]; 1648 struct timespec *tsp = NULL, ts[2]; 1649 1650 if (SCARG(uap, times)) { 1651 error = copyin(SCARG(uap, times), <s, sizeof(lts)); 1652 if (error != 0) 1653 return error; 1654 linux_to_native_timespec(&ts[0], <s[0]); 1655 linux_to_native_timespec(&ts[1], <s[1]); 1656 tsp = ts; 1657 } 1658 1659 return linux_do_sys_utimensat(l, SCARG(uap, fd), SCARG(uap, path), 1660 tsp, SCARG(uap, flag), retval); 1661 } 1662 1663 int 1664 linux_sys_futex(struct lwp *l, const struct linux_sys_futex_args *uap, 1665 register_t *retval) 1666 { 1667 /* { 1668 syscallarg(int *) uaddr; 1669 syscallarg(int) op; 1670 syscallarg(int) val; 1671 syscallarg(const struct linux_timespec *) timeout; 1672 syscallarg(int *) uaddr2; 1673 syscallarg(int) val3; 1674 } */ 1675 struct linux_timespec lts; 1676 struct timespec ts, *tsp = NULL; 1677 int val2 = 0; 1678 int error; 1679 1680 /* 1681 * Linux overlays the "timeout" field and the "val2" field. 1682 * "timeout" is only valid for FUTEX_WAIT and FUTEX_WAIT_BITSET 1683 * on Linux. 1684 */ 1685 const int op = (SCARG(uap, op) & FUTEX_CMD_MASK); 1686 if ((op == FUTEX_WAIT || op == FUTEX_WAIT_BITSET) && 1687 SCARG(uap, timeout) != NULL) { 1688 if ((error = copyin(SCARG(uap, timeout), 1689 <s, sizeof(lts))) != 0) { 1690 return error; 1691 } 1692 linux_to_native_timespec(&ts, <s); 1693 tsp = &ts; 1694 } else { 1695 val2 = (int)(uintptr_t)SCARG(uap, timeout); 1696 } 1697 1698 return linux_do_futex(SCARG(uap, uaddr), SCARG(uap, op), 1699 SCARG(uap, val), tsp, SCARG(uap, uaddr2), val2, 1700 SCARG(uap, val3), retval); 1701 } 1702 1703 int 1704 linux_do_futex(int *uaddr, int op, int val, struct timespec *timeout, 1705 int *uaddr2, int val2, int val3, register_t *retval) 1706 { 1707 /* 1708 * Always clear FUTEX_PRIVATE_FLAG for Linux processes. 1709 * NetBSD-native futexes exist in different namespace 1710 * depending on FUTEX_PRIVATE_FLAG. This appears not 1711 * to be the case in Linux, and some futex users will 1712 * mix private and non-private ops on the same futex 1713 * object. 1714 */ 1715 return do_futex(uaddr, op & ~FUTEX_PRIVATE_FLAG, 1716 val, timeout, uaddr2, val2, val3, retval); 1717 } 1718 1719 #define LINUX_EFD_SEMAPHORE 0x0001 1720 #define LINUX_EFD_CLOEXEC LINUX_O_CLOEXEC 1721 #define LINUX_EFD_NONBLOCK LINUX_O_NONBLOCK 1722 1723 static int 1724 linux_do_eventfd2(struct lwp *l, unsigned int initval, int flags, 1725 register_t *retval) 1726 { 1727 int nflags = 0; 1728 1729 if (flags & ~(LINUX_EFD_SEMAPHORE | LINUX_EFD_CLOEXEC | 1730 LINUX_EFD_NONBLOCK)) { 1731 return EINVAL; 1732 } 1733 if (flags & LINUX_EFD_SEMAPHORE) { 1734 nflags |= EFD_SEMAPHORE; 1735 } 1736 if (flags & LINUX_EFD_CLOEXEC) { 1737 nflags |= EFD_CLOEXEC; 1738 } 1739 if (flags & LINUX_EFD_NONBLOCK) { 1740 nflags |= EFD_NONBLOCK; 1741 } 1742 1743 return do_eventfd(l, initval, nflags, retval); 1744 } 1745 1746 int 1747 linux_sys_eventfd(struct lwp *l, const struct linux_sys_eventfd_args *uap, 1748 register_t *retval) 1749 { 1750 /* { 1751 syscallarg(unsigned int) initval; 1752 } */ 1753 1754 return linux_do_eventfd2(l, SCARG(uap, initval), 0, retval); 1755 } 1756 1757 int 1758 linux_sys_eventfd2(struct lwp *l, const struct linux_sys_eventfd2_args *uap, 1759 register_t *retval) 1760 { 1761 /* { 1762 syscallarg(unsigned int) initval; 1763 syscallarg(int) flags; 1764 } */ 1765 1766 return linux_do_eventfd2(l, SCARG(uap, initval), SCARG(uap, flags), 1767 retval); 1768 } 1769 1770 #ifndef __aarch64__ 1771 /* 1772 * epoll_create(2). Check size and call sys_epoll_create1. 1773 */ 1774 int 1775 linux_sys_epoll_create(struct lwp *l, 1776 const struct linux_sys_epoll_create_args *uap, register_t *retval) 1777 { 1778 /* { 1779 syscallarg(int) size; 1780 } */ 1781 struct sys_epoll_create1_args ca; 1782 1783 /* 1784 * SCARG(uap, size) is unused. Linux just tests it and then 1785 * forgets it as well. 1786 */ 1787 if (SCARG(uap, size) <= 0) 1788 return EINVAL; 1789 1790 SCARG(&ca, flags) = 0; 1791 return sys_epoll_create1(l, &ca, retval); 1792 } 1793 #endif /* !__aarch64__ */ 1794 1795 /* 1796 * epoll_create1(2). Translate the flags and call sys_epoll_create1. 1797 */ 1798 int 1799 linux_sys_epoll_create1(struct lwp *l, 1800 const struct linux_sys_epoll_create1_args *uap, register_t *retval) 1801 { 1802 /* { 1803 syscallarg(int) flags; 1804 } */ 1805 struct sys_epoll_create1_args ca; 1806 1807 if ((SCARG(uap, flags) & ~(LINUX_O_CLOEXEC)) != 0) 1808 return EINVAL; 1809 1810 SCARG(&ca, flags) = 0; 1811 if ((SCARG(uap, flags) & LINUX_O_CLOEXEC) != 0) 1812 SCARG(&ca, flags) |= EPOLL_CLOEXEC; 1813 1814 return sys_epoll_create1(l, &ca, retval); 1815 } 1816 1817 /* 1818 * epoll_ctl(2). Copyin event and translate it if necessary and then 1819 * call epoll_ctl_common(). 1820 */ 1821 int 1822 linux_sys_epoll_ctl(struct lwp *l, const struct linux_sys_epoll_ctl_args *uap, 1823 register_t *retval) 1824 { 1825 /* { 1826 syscallarg(int) epfd; 1827 syscallarg(int) op; 1828 syscallarg(int) fd; 1829 syscallarg(struct linux_epoll_event *) event; 1830 } */ 1831 struct linux_epoll_event lee; 1832 struct epoll_event ee; 1833 struct epoll_event *eep; 1834 int error; 1835 1836 if (SCARG(uap, op) != EPOLL_CTL_DEL) { 1837 error = copyin(SCARG(uap, event), &lee, sizeof(lee)); 1838 if (error != 0) 1839 return error; 1840 1841 /* 1842 * On some architectures, struct linux_epoll_event and 1843 * struct epoll_event are packed differently... but otherwise 1844 * the contents are the same. 1845 */ 1846 ee.events = lee.events; 1847 ee.data = lee.data; 1848 1849 eep = ⅇ 1850 } else 1851 eep = NULL; 1852 1853 return epoll_ctl_common(l, retval, SCARG(uap, epfd), SCARG(uap, op), 1854 SCARG(uap, fd), eep); 1855 } 1856 1857 #ifndef __aarch64__ 1858 /* 1859 * epoll_wait(2). Call sys_epoll_pwait(). 1860 */ 1861 int 1862 linux_sys_epoll_wait(struct lwp *l, 1863 const struct linux_sys_epoll_wait_args *uap, register_t *retval) 1864 { 1865 /* { 1866 syscallarg(int) epfd; 1867 syscallarg(struct linux_epoll_event *) events; 1868 syscallarg(int) maxevents; 1869 syscallarg(int) timeout; 1870 } */ 1871 struct linux_sys_epoll_pwait_args ea; 1872 1873 SCARG(&ea, epfd) = SCARG(uap, epfd); 1874 SCARG(&ea, events) = SCARG(uap, events); 1875 SCARG(&ea, maxevents) = SCARG(uap, maxevents); 1876 SCARG(&ea, timeout) = SCARG(uap, timeout); 1877 SCARG(&ea, sigmask) = NULL; 1878 1879 return linux_sys_epoll_pwait(l, &ea, retval); 1880 } 1881 #endif /* !__aarch64__ */ 1882 1883 /* 1884 * Main body of epoll_pwait2(2). Translate timeout and sigmask and 1885 * call epoll_wait_common. 1886 */ 1887 static int 1888 linux_epoll_pwait2_common(struct lwp *l, register_t *retval, int epfd, 1889 struct linux_epoll_event *events, int maxevents, 1890 struct linux_timespec *timeout, const linux_sigset_t *sigmask) 1891 { 1892 struct timespec ts, *tsp; 1893 linux_sigset_t lss; 1894 sigset_t ss, *ssp; 1895 struct epoll_event *eep; 1896 struct linux_epoll_event *leep; 1897 int i, error; 1898 1899 if (maxevents <= 0 || maxevents > EPOLL_MAX_EVENTS) 1900 return EINVAL; 1901 1902 if (timeout != NULL) { 1903 linux_to_native_timespec(&ts, timeout); 1904 tsp = &ts; 1905 } else 1906 tsp = NULL; 1907 1908 if (sigmask != NULL) { 1909 error = copyin(sigmask, &lss, sizeof(lss)); 1910 if (error != 0) 1911 return error; 1912 1913 linux_to_native_sigset(&ss, &lss); 1914 ssp = &ss; 1915 } else 1916 ssp = NULL; 1917 1918 eep = kmem_alloc(maxevents * sizeof(*eep), KM_SLEEP); 1919 1920 error = epoll_wait_common(l, retval, epfd, eep, maxevents, tsp, 1921 ssp); 1922 if (error == 0 && *retval > 0) { 1923 leep = kmem_alloc((*retval) * sizeof(*leep), KM_SLEEP); 1924 1925 /* Translate the events (because of packing). */ 1926 for (i = 0; i < *retval; i++) { 1927 leep[i].events = eep[i].events; 1928 leep[i].data = eep[i].data; 1929 } 1930 1931 error = copyout(leep, events, (*retval) * sizeof(*leep)); 1932 kmem_free(leep, (*retval) * sizeof(*leep)); 1933 } 1934 1935 kmem_free(eep, maxevents * sizeof(*eep)); 1936 return error; 1937 } 1938 1939 /* 1940 * epoll_pwait(2). Translate timeout and call sys_epoll_pwait2. 1941 */ 1942 int 1943 linux_sys_epoll_pwait(struct lwp *l, 1944 const struct linux_sys_epoll_pwait_args *uap, register_t *retval) 1945 { 1946 /* { 1947 syscallarg(int) epfd; 1948 syscallarg(struct linux_epoll_event *) events; 1949 syscallarg(int) maxevents; 1950 syscallarg(int) timeout; 1951 syscallarg(linux_sigset_t *) sigmask; 1952 } */ 1953 struct linux_timespec lts, *ltsp; 1954 const int timeout = SCARG(uap, timeout); 1955 1956 if (timeout >= 0) { 1957 /* Convert from milliseconds to timespec. */ 1958 lts.tv_sec = timeout / 1000; 1959 lts.tv_nsec = (timeout % 1000) * 1000000; 1960 1961 ltsp = <s; 1962 } else 1963 ltsp = NULL; 1964 1965 return linux_epoll_pwait2_common(l, retval, SCARG(uap, epfd), 1966 SCARG(uap, events), SCARG(uap, maxevents), ltsp, 1967 SCARG(uap, sigmask)); 1968 } 1969 1970 1971 /* 1972 * epoll_pwait2(2). Copyin timeout and call linux_epoll_pwait2_common(). 1973 */ 1974 int 1975 linux_sys_epoll_pwait2(struct lwp *l, 1976 const struct linux_sys_epoll_pwait2_args *uap, register_t *retval) 1977 { 1978 /* { 1979 syscallarg(int) epfd; 1980 syscallarg(struct linux_epoll_event *) events; 1981 syscallarg(int) maxevents; 1982 syscallarg(struct linux_timespec *) timeout; 1983 syscallarg(linux_sigset_t *) sigmask; 1984 } */ 1985 struct linux_timespec lts, *ltsp; 1986 int error; 1987 1988 if (SCARG(uap, timeout) != NULL) { 1989 error = copyin(SCARG(uap, timeout), <s, sizeof(lts)); 1990 if (error != 0) 1991 return error; 1992 1993 ltsp = <s; 1994 } else 1995 ltsp = NULL; 1996 1997 return linux_epoll_pwait2_common(l, retval, SCARG(uap, epfd), 1998 SCARG(uap, events), SCARG(uap, maxevents), ltsp, 1999 SCARG(uap, sigmask)); 2000 } 2001 2002 #define LINUX_MFD_CLOEXEC 0x0001U 2003 #define LINUX_MFD_ALLOW_SEALING 0x0002U 2004 #define LINUX_MFD_HUGETLB 0x0004U 2005 #define LINUX_MFD_NOEXEC_SEAL 0x0008U 2006 #define LINUX_MFD_EXEC 0x0010U 2007 #define LINUX_MFD_HUGE_FLAGS (0x3f << 26) 2008 2009 #define LINUX_MFD_ALL_FLAGS (LINUX_MFD_CLOEXEC|LINUX_MFD_ALLOW_SEALING \ 2010 |LINUX_MFD_HUGETLB|LINUX_MFD_NOEXEC_SEAL \ 2011 |LINUX_MFD_EXEC|LINUX_MFD_HUGE_FLAGS) 2012 #define LINUX_MFD_KNOWN_FLAGS (LINUX_MFD_CLOEXEC|LINUX_MFD_ALLOW_SEALING) 2013 2014 #define LINUX_MFD_NAME_MAX 249 2015 2016 /* 2017 * memfd_create(2). Do some error checking and then call NetBSD's 2018 * version. 2019 */ 2020 int 2021 linux_sys_memfd_create(struct lwp *l, 2022 const struct linux_sys_memfd_create_args *uap, register_t *retval) 2023 { 2024 /* { 2025 syscallarg(const char *) name; 2026 syscallarg(unsigned int) flags; 2027 } */ 2028 int error; 2029 char *pbuf; 2030 struct sys_memfd_create_args muap; 2031 const unsigned int lflags = SCARG(uap, flags); 2032 2033 KASSERT(LINUX_MFD_NAME_MAX < NAME_MAX); /* sanity check */ 2034 2035 if (lflags & ~LINUX_MFD_ALL_FLAGS) 2036 return EINVAL; 2037 if ((lflags & LINUX_MFD_HUGE_FLAGS) != 0 && 2038 (lflags & LINUX_MFD_HUGETLB) == 0) 2039 return EINVAL; 2040 if ((lflags & LINUX_MFD_HUGETLB) && (lflags & LINUX_MFD_ALLOW_SEALING)) 2041 return EINVAL; 2042 2043 /* Linux has a stricter limit for name size */ 2044 pbuf = PNBUF_GET(); 2045 error = copyinstr(SCARG(uap, name), pbuf, LINUX_MFD_NAME_MAX+1, NULL); 2046 PNBUF_PUT(pbuf); 2047 pbuf = NULL; 2048 if (error != 0) { 2049 if (error == ENAMETOOLONG) 2050 error = EINVAL; 2051 return error; 2052 } 2053 2054 if (lflags & ~LINUX_MFD_KNOWN_FLAGS) { 2055 DPRINTF("%s: ignored flags %#x\n", __func__, 2056 lflags & ~LINUX_MFD_KNOWN_FLAGS); 2057 } 2058 2059 SCARG(&muap, name) = SCARG(uap, name); 2060 SCARG(&muap, flags) = lflags & LINUX_MFD_KNOWN_FLAGS; 2061 2062 return sys_memfd_create(l, &muap, retval); 2063 } 2064 2065 #define LINUX_CLOSE_RANGE_UNSHARE 0x02U 2066 #define LINUX_CLOSE_RANGE_CLOEXEC 0x04U 2067 2068 /* 2069 * close_range(2). 2070 */ 2071 int 2072 linux_sys_close_range(struct lwp *l, 2073 const struct linux_sys_close_range_args *uap, register_t *retval) 2074 { 2075 /* { 2076 syscallarg(unsigned int) first; 2077 syscallarg(unsigned int) last; 2078 syscallarg(unsigned int) flags; 2079 } */ 2080 unsigned int fd, last; 2081 file_t *fp; 2082 filedesc_t *fdp; 2083 const unsigned int flags = SCARG(uap, flags); 2084 2085 if (flags & ~(LINUX_CLOSE_RANGE_CLOEXEC|LINUX_CLOSE_RANGE_UNSHARE)) 2086 return EINVAL; 2087 if (SCARG(uap, first) > SCARG(uap, last)) 2088 return EINVAL; 2089 2090 if (flags & LINUX_CLOSE_RANGE_UNSHARE) { 2091 fdp = fd_copy(); 2092 fd_free(); 2093 l->l_proc->p_fd = fdp; 2094 l->l_fd = fdp; 2095 } 2096 2097 last = MIN(SCARG(uap, last), l->l_proc->p_fd->fd_lastfile); 2098 for (fd = SCARG(uap, first); fd <= last; fd++) { 2099 fp = fd_getfile(fd); 2100 if (fp == NULL) 2101 continue; 2102 2103 if (flags & LINUX_CLOSE_RANGE_CLOEXEC) { 2104 fd_set_exclose(l, fd, true); 2105 fd_putfile(fd); 2106 } else 2107 fd_close(fd); 2108 } 2109 2110 return 0; 2111 } 2112 2113 /* 2114 * readahead(2). Call posix_fadvise with POSIX_FADV_WILLNEED with some extra 2115 * error checking. 2116 */ 2117 int 2118 linux_sys_readahead(struct lwp *l, const struct linux_sys_readahead_args *uap, 2119 register_t *retval) 2120 { 2121 /* { 2122 syscallarg(int) fd; 2123 syscallarg(off_t) offset; 2124 syscallarg(size_t) count; 2125 } */ 2126 file_t *fp; 2127 int error = 0; 2128 const int fd = SCARG(uap, fd); 2129 2130 fp = fd_getfile(fd); 2131 if (fp == NULL) 2132 return EBADF; 2133 if ((fp->f_flag & FREAD) == 0) 2134 error = EBADF; 2135 else if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VREG) 2136 error = EINVAL; 2137 fd_putfile(fd); 2138 if (error != 0) 2139 return error; 2140 2141 return do_posix_fadvise(fd, SCARG(uap, offset), SCARG(uap, count), 2142 POSIX_FADV_WILLNEED); 2143 } 2144 2145 int 2146 linux_sys_getcpu(lwp_t *l, const struct linux_sys_getcpu_args *uap, 2147 register_t *retval) 2148 { 2149 /* { 2150 syscallarg(unsigned int *) cpu; 2151 syscallarg(unsigned int *) node; 2152 syscallarg(struct linux_getcpu_cache *) tcache; 2153 }*/ 2154 int error; 2155 2156 if (SCARG(uap, cpu)) { 2157 u_int cpu_id = l->l_cpu->ci_data.cpu_index; 2158 error = copyout(&cpu_id, SCARG(uap, cpu), sizeof(cpu_id)); 2159 if (error) 2160 return error; 2161 2162 } 2163 2164 // TO-DO: Test on a NUMA machine if the node_id returned is correct 2165 if (SCARG(uap, node)) { 2166 u_int node_id = l->l_cpu->ci_data.cpu_numa_id; 2167 error = copyout(&node_id, SCARG(uap, node), sizeof(node_id)); 2168 if (error) 2169 return error; 2170 } 2171 2172 return 0; 2173 } 2174
Indexes created Sun Sep 21 20:09:37 GMT 2025