| 1 | /* $Id: SUPLib-linux.cpp 39091 2011-10-24 13:58:22Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * VirtualBox Support Library - GNU/Linux specific parts.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 | /*******************************************************************************
|
|---|
| 28 | * Header Files *
|
|---|
| 29 | *******************************************************************************/
|
|---|
| 30 | #define LOG_GROUP LOG_GROUP_SUP
|
|---|
| 31 | #ifdef IN_SUP_HARDENED_R3
|
|---|
| 32 | # undef DEBUG /* Warning: disables RT_STRICT */
|
|---|
| 33 | # define LOG_DISABLED
|
|---|
| 34 | /** @todo RTLOGREL_DISABLED */
|
|---|
| 35 | # include <iprt/log.h>
|
|---|
| 36 | # undef LogRelIt
|
|---|
| 37 | # define LogRelIt(pvInst, fFlags, iGroup, fmtargs) do { } while (0)
|
|---|
| 38 | #endif
|
|---|
| 39 |
|
|---|
| 40 | #include <sys/fcntl.h>
|
|---|
| 41 | #include <sys/ioctl.h>
|
|---|
| 42 | #include <sys/mman.h>
|
|---|
| 43 | #include <errno.h>
|
|---|
| 44 | #include <unistd.h>
|
|---|
| 45 | #include <stdlib.h>
|
|---|
| 46 | #include <malloc.h>
|
|---|
| 47 |
|
|---|
| 48 | #include <VBox/log.h>
|
|---|
| 49 | #include <VBox/sup.h>
|
|---|
| 50 | #include <iprt/path.h>
|
|---|
| 51 | #include <iprt/assert.h>
|
|---|
| 52 | #include <VBox/types.h>
|
|---|
| 53 | #include <iprt/string.h>
|
|---|
| 54 | #include <iprt/system.h>
|
|---|
| 55 | #include <VBox/err.h>
|
|---|
| 56 | #include <VBox/param.h>
|
|---|
| 57 | #include "../SUPLibInternal.h"
|
|---|
| 58 | #include "../SUPDrvIOC.h"
|
|---|
| 59 |
|
|---|
| 60 |
|
|---|
| 61 | /*******************************************************************************
|
|---|
| 62 | * Defined Constants And Macros *
|
|---|
| 63 | *******************************************************************************/
|
|---|
| 64 | /** Unix Device name. */
|
|---|
| 65 | #define DEVICE_NAME "/dev/vboxdrv"
|
|---|
| 66 |
|
|---|
| 67 | /* define MADV_DONTFORK if it's missing from the system headers. */
|
|---|
| 68 | #ifndef MADV_DONTFORK
|
|---|
| 69 | # define MADV_DONTFORK 10
|
|---|
| 70 | #endif
|
|---|
| 71 |
|
|---|
| 72 |
|
|---|
| 73 |
|
|---|
| 74 | int suplibOsInit(PSUPLIBDATA pThis, bool fPreInited)
|
|---|
| 75 | {
|
|---|
| 76 | /*
|
|---|
| 77 | * Nothing to do if pre-inited.
|
|---|
| 78 | */
|
|---|
| 79 | if (fPreInited)
|
|---|
| 80 | return VINF_SUCCESS;
|
|---|
| 81 | Assert(pThis->hDevice == (intptr_t)NIL_RTFILE);
|
|---|
| 82 |
|
|---|
| 83 | /*
|
|---|
| 84 | * Check if madvise works.
|
|---|
| 85 | */
|
|---|
| 86 | void *pv = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|---|
| 87 | if (pv == MAP_FAILED)
|
|---|
| 88 | return VERR_NO_MEMORY;
|
|---|
| 89 | pThis->fSysMadviseWorks = (0 == madvise(pv, PAGE_SIZE, MADV_DONTFORK));
|
|---|
| 90 | munmap(pv, PAGE_SIZE);
|
|---|
| 91 |
|
|---|
| 92 | /*
|
|---|
| 93 | * Try open the device.
|
|---|
| 94 | */
|
|---|
| 95 | int hDevice = open(DEVICE_NAME, O_RDWR, 0);
|
|---|
| 96 | if (hDevice < 0)
|
|---|
| 97 | {
|
|---|
| 98 | /*
|
|---|
| 99 | * Try load the device.
|
|---|
| 100 | */
|
|---|
| 101 | hDevice = open(DEVICE_NAME, O_RDWR, 0);
|
|---|
| 102 | if (hDevice < 0)
|
|---|
| 103 | {
|
|---|
| 104 | int rc;
|
|---|
| 105 | switch (errno)
|
|---|
| 106 | {
|
|---|
| 107 | case ENXIO: /* see man 2 open, ENODEV is actually a kernel bug */
|
|---|
| 108 | case ENODEV: rc = VERR_VM_DRIVER_LOAD_ERROR; break;
|
|---|
| 109 | case EPERM:
|
|---|
| 110 | case EACCES: rc = VERR_VM_DRIVER_NOT_ACCESSIBLE; break;
|
|---|
| 111 | case ENOENT: rc = VERR_VM_DRIVER_NOT_INSTALLED; break;
|
|---|
| 112 | default: rc = VERR_VM_DRIVER_OPEN_ERROR; break;
|
|---|
| 113 | }
|
|---|
| 114 | LogRel(("Failed to open \"%s\", errno=%d, rc=%Rrc\n", DEVICE_NAME, errno, rc));
|
|---|
| 115 | return rc;
|
|---|
| 116 | }
|
|---|
| 117 | }
|
|---|
| 118 |
|
|---|
| 119 | /*
|
|---|
| 120 | * Mark the file handle close on exec.
|
|---|
| 121 | */
|
|---|
| 122 | if (fcntl(hDevice, F_SETFD, FD_CLOEXEC) == -1)
|
|---|
| 123 | {
|
|---|
| 124 | close(hDevice);
|
|---|
| 125 | #ifdef IN_SUP_HARDENED_R3
|
|---|
| 126 | return VERR_INTERNAL_ERROR;
|
|---|
| 127 | #else
|
|---|
| 128 | return RTErrConvertFromErrno(errno);
|
|---|
| 129 | #endif
|
|---|
| 130 | }
|
|---|
| 131 |
|
|---|
| 132 | /*
|
|---|
| 133 | * We're done.
|
|---|
| 134 | */
|
|---|
| 135 | pThis->hDevice = hDevice;
|
|---|
| 136 | return VINF_SUCCESS;
|
|---|
| 137 | }
|
|---|
| 138 |
|
|---|
| 139 |
|
|---|
| 140 | #ifndef IN_SUP_HARDENED_R3
|
|---|
| 141 |
|
|---|
| 142 | int suplibOsTerm(PSUPLIBDATA pThis)
|
|---|
| 143 | {
|
|---|
| 144 | /*
|
|---|
| 145 | * Close the device if it's actually open.
|
|---|
| 146 | */
|
|---|
| 147 | if (pThis->hDevice != (intptr_t)NIL_RTFILE)
|
|---|
| 148 | {
|
|---|
| 149 | if (close(pThis->hDevice))
|
|---|
| 150 | AssertFailed();
|
|---|
| 151 | pThis->hDevice = (intptr_t)NIL_RTFILE;
|
|---|
| 152 | }
|
|---|
| 153 |
|
|---|
| 154 | return 0;
|
|---|
| 155 | }
|
|---|
| 156 |
|
|---|
| 157 |
|
|---|
| 158 | int suplibOsInstall(void)
|
|---|
| 159 | {
|
|---|
| 160 | // nothing to do on Linux
|
|---|
| 161 | return VERR_NOT_IMPLEMENTED;
|
|---|
| 162 | }
|
|---|
| 163 |
|
|---|
| 164 |
|
|---|
| 165 | int suplibOsUninstall(void)
|
|---|
| 166 | {
|
|---|
| 167 | // nothing to do on Linux
|
|---|
| 168 | return VERR_NOT_IMPLEMENTED;
|
|---|
| 169 | }
|
|---|
| 170 |
|
|---|
| 171 |
|
|---|
| 172 | int suplibOsIOCtl(PSUPLIBDATA pThis, uintptr_t uFunction, void *pvReq, size_t cbReq)
|
|---|
| 173 | {
|
|---|
| 174 | AssertMsg(pThis->hDevice != (intptr_t)NIL_RTFILE, ("SUPLIB not initiated successfully!\n"));
|
|---|
| 175 | NOREF(cbReq);
|
|---|
| 176 |
|
|---|
| 177 | /*
|
|---|
| 178 | * Issue device iocontrol.
|
|---|
| 179 | */
|
|---|
| 180 | if (RT_LIKELY(ioctl(pThis->hDevice, uFunction, pvReq) >= 0))
|
|---|
| 181 | return VINF_SUCCESS;
|
|---|
| 182 |
|
|---|
| 183 | /* This is the reverse operation of the one found in SUPDrv-linux.c */
|
|---|
| 184 | switch (errno)
|
|---|
| 185 | {
|
|---|
| 186 | case EACCES: return VERR_GENERAL_FAILURE;
|
|---|
| 187 | case EINVAL: return VERR_INVALID_PARAMETER;
|
|---|
| 188 | case EILSEQ: return VERR_INVALID_MAGIC;
|
|---|
| 189 | case ENXIO: return VERR_INVALID_HANDLE;
|
|---|
| 190 | case EFAULT: return VERR_INVALID_POINTER;
|
|---|
| 191 | case ENOLCK: return VERR_LOCK_FAILED;
|
|---|
| 192 | case EEXIST: return VERR_ALREADY_LOADED;
|
|---|
| 193 | case EPERM: return VERR_PERMISSION_DENIED;
|
|---|
| 194 | case ENOSYS: return VERR_VERSION_MISMATCH;
|
|---|
| 195 | case 1000: return VERR_IDT_FAILED;
|
|---|
| 196 | }
|
|---|
| 197 |
|
|---|
| 198 | return RTErrConvertFromErrno(errno);
|
|---|
| 199 | }
|
|---|
| 200 |
|
|---|
| 201 |
|
|---|
| 202 | int suplibOsIOCtlFast(PSUPLIBDATA pThis, uintptr_t uFunction, uintptr_t idCpu)
|
|---|
| 203 | {
|
|---|
| 204 | int rc = ioctl(pThis->hDevice, uFunction, idCpu);
|
|---|
| 205 | if (rc == -1)
|
|---|
| 206 | rc = -errno;
|
|---|
| 207 | return rc;
|
|---|
| 208 | }
|
|---|
| 209 |
|
|---|
| 210 |
|
|---|
| 211 | int suplibOsPageAlloc(PSUPLIBDATA pThis, size_t cPages, void **ppvPages)
|
|---|
| 212 | {
|
|---|
| 213 | size_t cbMmap = (pThis->fSysMadviseWorks ? cPages : cPages + 2) << PAGE_SHIFT;
|
|---|
| 214 | char *pvPages = (char *)mmap(NULL, cbMmap, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|---|
| 215 | if (pvPages == MAP_FAILED)
|
|---|
| 216 | return VERR_NO_MEMORY;
|
|---|
| 217 |
|
|---|
| 218 | if (pThis->fSysMadviseWorks)
|
|---|
| 219 | {
|
|---|
| 220 | /*
|
|---|
| 221 | * It is not fatal if we fail here but a forked child (e.g. the ALSA sound server)
|
|---|
| 222 | * could crash. Linux < 2.6.16 does not implement madvise(MADV_DONTFORK) but the
|
|---|
| 223 | * kernel seems to split bigger VMAs and that is all that we want -- later we set the
|
|---|
| 224 | * VM_DONTCOPY attribute in supdrvOSLockMemOne().
|
|---|
| 225 | */
|
|---|
| 226 | if (madvise (pvPages, cbMmap, MADV_DONTFORK))
|
|---|
| 227 | LogRel(("SUPLib: madvise %p-%p failed\n", pvPages, cbMmap));
|
|---|
| 228 | *ppvPages = pvPages;
|
|---|
| 229 | }
|
|---|
| 230 | else
|
|---|
| 231 | {
|
|---|
| 232 | /*
|
|---|
| 233 | * madvise(MADV_DONTFORK) is not available (most probably Linux 2.4). Enclose any
|
|---|
| 234 | * mmapped region by two unmapped pages to guarantee that there is exactly one VM
|
|---|
| 235 | * area struct of the very same size as the mmap area.
|
|---|
| 236 | */
|
|---|
| 237 | mprotect(pvPages, PAGE_SIZE, PROT_NONE);
|
|---|
| 238 | mprotect(pvPages + cbMmap - PAGE_SIZE, PAGE_SIZE, PROT_NONE);
|
|---|
| 239 | *ppvPages = pvPages + PAGE_SIZE;
|
|---|
| 240 | }
|
|---|
| 241 | memset(*ppvPages, 0, cPages << PAGE_SHIFT);
|
|---|
| 242 | return VINF_SUCCESS;
|
|---|
| 243 | }
|
|---|
| 244 |
|
|---|
| 245 |
|
|---|
| 246 | int suplibOsPageFree(PSUPLIBDATA pThis, void *pvPages, size_t cPages)
|
|---|
| 247 | {
|
|---|
| 248 | NOREF(pThis);
|
|---|
| 249 | munmap(pvPages, cPages << PAGE_SHIFT);
|
|---|
| 250 | return VINF_SUCCESS;
|
|---|
| 251 | }
|
|---|
| 252 |
|
|---|
| 253 |
|
|---|
| 254 | /** Check if the host kernel supports VT-x or not.
|
|---|
| 255 | *
|
|---|
| 256 | * Older Linux kernels clear the VMXE bit in the CR4 register (function
|
|---|
| 257 | * tlb_flush_all()) leading to a host kernel panic.
|
|---|
| 258 | */
|
|---|
| 259 | int suplibOsQueryVTxSupported(void)
|
|---|
| 260 | {
|
|---|
| 261 | char szBuf[256];
|
|---|
| 262 | int rc = RTSystemQueryOSInfo(RTSYSOSINFO_RELEASE, szBuf, sizeof(szBuf));
|
|---|
| 263 |
|
|---|
| 264 | if (RT_SUCCESS(rc))
|
|---|
| 265 | {
|
|---|
| 266 | char *pszNext;
|
|---|
| 267 | uint32_t uA, uB, uC;
|
|---|
| 268 |
|
|---|
| 269 | rc = RTStrToUInt32Ex(szBuf, &pszNext, 10, &uA);
|
|---|
| 270 | if ( RT_SUCCESS(rc)
|
|---|
| 271 | && *pszNext == '.')
|
|---|
| 272 | {
|
|---|
| 273 | /*
|
|---|
| 274 | * new version number scheme starting with Linux 3.0
|
|---|
| 275 | */
|
|---|
| 276 | if (uA >= 3)
|
|---|
| 277 | return VINF_SUCCESS;
|
|---|
| 278 | rc = RTStrToUInt32Ex(pszNext+1, &pszNext, 10, &uB);
|
|---|
| 279 | if ( RT_SUCCESS(rc)
|
|---|
| 280 | && *pszNext == '.')
|
|---|
| 281 | {
|
|---|
| 282 | rc = RTStrToUInt32Ex(pszNext+1, &pszNext, 10, &uC);
|
|---|
| 283 | if (RT_SUCCESS(rc))
|
|---|
| 284 | {
|
|---|
| 285 | uint32_t uLinuxVersion = (uA << 16) + (uB << 8) + uC;
|
|---|
| 286 | if (uLinuxVersion >= (2 << 16) + (6 << 8) + 13)
|
|---|
| 287 | return VINF_SUCCESS;
|
|---|
| 288 | }
|
|---|
| 289 | }
|
|---|
| 290 | }
|
|---|
| 291 | }
|
|---|
| 292 |
|
|---|
| 293 | return VERR_SUPDRV_KERNEL_TOO_OLD_FOR_VTX;
|
|---|
| 294 | }
|
|---|
| 295 |
|
|---|
| 296 | #endif /* !IN_SUP_HARDENED_R3 */
|
|---|
| 297 |
|
|---|
