Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 389 insertions, 0 deletions

diff --git a/src/VBox/Devices/Storage/DrvHostBase-linux.cpp b/src/VBox/Devices/Storage/DrvHostBase-linux.cpp
new file mode 100644
index 00000000..265e93dc
--- /dev/null
+++ b/src/VBox/Devices/Storage/DrvHostBase-linux.cpp
@@ -0,0 +1,389 @@
+/* $Id: DrvHostBase-linux.cpp $ */
+/** @file
+ * DrvHostBase - Host base drive access driver, Linux specifics.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_DRV_HOST_BASE
+#include <sys/ioctl.h>
+#include <sys/fcntl.h>
+#include <errno.h>
+#include <linux/version.h>
+/* All the following crap is apparently not necessary anymore since Linux
+ * version 2.6.29. */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+/* This is a hack to work around conflicts between these linux kernel headers
+ * and the GLIBC tcpip headers. They have different declarations of the 4
+ * standard byte order functions. */
+# define _LINUX_BYTEORDER_GENERIC_H
+/* This is another hack for not bothering with C++ unfriendly byteswap macros. */
+/* Those macros that are needed are defined in the header below. */
+# include "swab.h"
+#endif
+#include <linux/fd.h>
+#include <linux/cdrom.h>
+#include <limits.h>
+
+#include <iprt/mem.h>
+#include <iprt/file.h>
+#include <iprt/string.h>
+#include <VBox/err.h>
+#include <VBox/scsi.h>
+
+
+/**
+ * Host backend specific data (needed by DrvHostBase.h).
+ */
+typedef struct DRVHOSTBASEOS
+{
+    /** The filehandle of the device. */
+    RTFILE                  hFileDevice;
+    /** Double buffer required for ioctl with the Linux kernel as long as we use
+     * remap_pfn_range() instead of vm_insert_page(). */
+    uint8_t                *pbDoubleBuffer;
+    /** Previous disk inserted indicator for the media polling on floppy drives. */
+    bool                   fPrevDiskIn;
+} DRVHOSTBASEOS;
+/** Pointer to the host backend specific data. */
+typedef DRVHOSTBASEOS *PDRVHOSBASEOS;
+AssertCompile(sizeof(DRVHOSTBASEOS) <= 64);
+
+#define DRVHOSTBASE_OS_INT_DECLARED
+#include "DrvHostBase.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Maximum buffer size supported by the kernel interface. */
+#define LNX_SCSI_MAX_BUFFER_SIZE (100 * _1K)
+
+
+
+
+
+DECLHIDDEN(int) drvHostBaseScsiCmdOs(PDRVHOSTBASE pThis, const uint8_t *pbCmd, size_t cbCmd, PDMMEDIATXDIR enmTxDir,
+                                     void *pvBuf, uint32_t *pcbBuf, uint8_t *pbSense, size_t cbSense, uint32_t cTimeoutMillies)
+{
+    /*
+     * Minimal input validation.
+     */
+    Assert(enmTxDir == PDMMEDIATXDIR_NONE || enmTxDir == PDMMEDIATXDIR_FROM_DEVICE || enmTxDir == PDMMEDIATXDIR_TO_DEVICE);
+    Assert(!pvBuf || pcbBuf);
+    Assert(pvBuf || enmTxDir == PDMMEDIATXDIR_NONE);
+    Assert(pbSense || !cbSense); RT_NOREF(cbSense);
+    AssertPtr(pbCmd);
+    Assert(cbCmd <= 16 && cbCmd >= 1);
+
+    /* Allocate the temporary buffer lazily. */
+    if(RT_UNLIKELY(!pThis->Os.pbDoubleBuffer))
+    {
+        pThis->Os.pbDoubleBuffer = (uint8_t *)RTMemAlloc(LNX_SCSI_MAX_BUFFER_SIZE);
+        if (!pThis->Os.pbDoubleBuffer)
+            return VERR_NO_MEMORY;
+    }
+
+    int rc = VERR_GENERAL_FAILURE;
+    int direction;
+    struct cdrom_generic_command cgc;
+
+    switch (enmTxDir)
+    {
+        case PDMMEDIATXDIR_NONE:
+            Assert(*pcbBuf == 0);
+            direction = CGC_DATA_NONE;
+            break;
+        case PDMMEDIATXDIR_FROM_DEVICE:
+            Assert(*pcbBuf != 0);
+            Assert(*pcbBuf <= LNX_SCSI_MAX_BUFFER_SIZE);
+            /* Make sure that the buffer is clear for commands reading
+             * data. The actually received data may be shorter than what
+             * we expect, and due to the unreliable feedback about how much
+             * data the ioctl actually transferred, it's impossible to
+             * prevent that. Returning previous buffer contents may cause
+             * security problems inside the guest OS, if users can issue
+             * commands to the CDROM device. */
+            memset(pThis->Os.pbDoubleBuffer, '\0', *pcbBuf);
+            direction = CGC_DATA_READ;
+            break;
+        case PDMMEDIATXDIR_TO_DEVICE:
+            Assert(*pcbBuf != 0);
+            Assert(*pcbBuf <= LNX_SCSI_MAX_BUFFER_SIZE);
+            memcpy(pThis->Os.pbDoubleBuffer, pvBuf, *pcbBuf);
+            direction = CGC_DATA_WRITE;
+            break;
+        default:
+            AssertMsgFailed(("enmTxDir invalid!\n"));
+            direction = CGC_DATA_NONE;
+    }
+    memset(&cgc, '\0', sizeof(cgc));
+    memcpy(cgc.cmd, pbCmd, RT_MIN(CDROM_PACKET_SIZE, cbCmd));
+    cgc.buffer = (unsigned char *)pThis->Os.pbDoubleBuffer;
+    cgc.buflen = *pcbBuf;
+    cgc.stat = 0;
+    Assert(cbSense >= sizeof(struct request_sense));
+    cgc.sense = (struct request_sense *)pbSense;
+    cgc.data_direction = direction;
+    cgc.quiet = false;
+    cgc.timeout = cTimeoutMillies;
+    rc = ioctl(RTFileToNative(pThis->Os.hFileDevice), CDROM_SEND_PACKET, &cgc);
+    if (rc < 0)
+    {
+        if (errno == EBUSY)
+            rc = VERR_PDM_MEDIA_LOCKED;
+        else if (errno == ENOSYS)
+            rc = VERR_NOT_SUPPORTED;
+        else
+        {
+            rc = RTErrConvertFromErrno(errno);
+            if (rc == VERR_ACCESS_DENIED && cgc.sense->sense_key == SCSI_SENSE_NONE)
+                cgc.sense->sense_key = SCSI_SENSE_ILLEGAL_REQUEST;
+            Log2(("%s: error status %d, rc=%Rrc\n", __FUNCTION__, cgc.stat, rc));
+        }
+    }
+    switch (enmTxDir)
+    {
+        case PDMMEDIATXDIR_FROM_DEVICE:
+            memcpy(pvBuf, pThis->Os.pbDoubleBuffer, *pcbBuf);
+            break;
+        default:
+            ;
+    }
+    Log2(("%s: after ioctl: cgc.buflen=%d txlen=%d\n", __FUNCTION__, cgc.buflen, *pcbBuf));
+    /* The value of cgc.buflen does not reliably reflect the actual amount
+     * of data transferred (for packet commands with little data transfer
+     * it's 0). So just assume that everything worked ok. */
+
+    return rc;
+}
+
+
+DECLHIDDEN(size_t) drvHostBaseScsiCmdGetBufLimitOs(PDRVHOSTBASE pThis)
+{
+    RT_NOREF(pThis);
+
+    return LNX_SCSI_MAX_BUFFER_SIZE;
+}
+
+
+DECLHIDDEN(int) drvHostBaseGetMediaSizeOs(PDRVHOSTBASE pThis, uint64_t *pcb)
+{
+    int rc = VERR_INVALID_STATE;
+
+    if (PDMMEDIATYPE_IS_FLOPPY(pThis->enmType))
+    {
+        rc = ioctl(RTFileToNative(pThis->Os.hFileDevice), FDFLUSH);
+        if (rc)
+        {
+            rc = RTErrConvertFromErrno (errno);
+            Log(("DrvHostFloppy: FDFLUSH ioctl(%s) failed, errno=%d rc=%Rrc\n", pThis->pszDevice, errno, rc));
+            return rc;
+        }
+
+        floppy_drive_struct DrvStat;
+        rc = ioctl(RTFileToNative(pThis->Os.hFileDevice), FDGETDRVSTAT, &DrvStat);
+        if (rc)
+        {
+            rc = RTErrConvertFromErrno(errno);
+            Log(("DrvHostFloppy: FDGETDRVSTAT ioctl(%s) failed, errno=%d rc=%Rrc\n", pThis->pszDevice, errno, rc));
+            return rc;
+        }
+        pThis->fReadOnly = !(DrvStat.flags & FD_DISK_WRITABLE);
+        rc = RTFileSeek(pThis->Os.hFileDevice, 0, RTFILE_SEEK_END, pcb);
+    }
+    else if (pThis->enmType == PDMMEDIATYPE_CDROM || pThis->enmType == PDMMEDIATYPE_DVD)
+    {
+        /* Clear the media-changed-since-last-call-thingy just to be on the safe side. */
+        ioctl(RTFileToNative(pThis->Os.hFileDevice), CDROM_MEDIA_CHANGED, CDSL_CURRENT);
+        rc = RTFileSeek(pThis->Os.hFileDevice, 0, RTFILE_SEEK_END, pcb);
+    }
+
+    return rc;
+}
+
+
+DECLHIDDEN(int) drvHostBaseReadOs(PDRVHOSTBASE pThis, uint64_t off, void *pvBuf, size_t cbRead)
+{
+    return RTFileReadAt(pThis->Os.hFileDevice, off, pvBuf, cbRead, NULL);
+}
+
+
+DECLHIDDEN(int) drvHostBaseWriteOs(PDRVHOSTBASE pThis, uint64_t off, const void *pvBuf, size_t cbWrite)
+{
+    return RTFileWriteAt(pThis->Os.hFileDevice, off, pvBuf, cbWrite, NULL);
+}
+
+
+DECLHIDDEN(int) drvHostBaseFlushOs(PDRVHOSTBASE pThis)
+{
+    return RTFileFlush(pThis->Os.hFileDevice);
+}
+
+
+DECLHIDDEN(int) drvHostBaseDoLockOs(PDRVHOSTBASE pThis, bool fLock)
+{
+    int rc = ioctl(RTFileToNative(pThis->Os.hFileDevice), CDROM_LOCKDOOR, (int)fLock);
+    if (rc < 0)
+    {
+        if (errno == EBUSY)
+            rc = VERR_ACCESS_DENIED;
+        else if (errno == EDRIVE_CANT_DO_THIS)
+            rc = VERR_NOT_SUPPORTED;
+        else
+            rc = RTErrConvertFromErrno(errno);
+    }
+
+    return rc;
+}
+
+
+DECLHIDDEN(int) drvHostBaseEjectOs(PDRVHOSTBASE pThis)
+{
+    int rc = ioctl(RTFileToNative(pThis->Os.hFileDevice), CDROMEJECT, 0);
+    if (rc < 0)
+    {
+        if (errno == EBUSY)
+            rc = VERR_PDM_MEDIA_LOCKED;
+        else if (errno == ENOSYS)
+            rc = VERR_NOT_SUPPORTED;
+        else
+            rc = RTErrConvertFromErrno(errno);
+    }
+
+    return rc;
+}
+
+
+DECLHIDDEN(int) drvHostBaseQueryMediaStatusOs(PDRVHOSTBASE pThis, bool *pfMediaChanged, bool *pfMediaPresent)
+{
+    int rc = VINF_SUCCESS;
+
+    if (PDMMEDIATYPE_IS_FLOPPY(pThis->enmType))
+    {
+        floppy_drive_struct DrvStat;
+        int rcLnx = ioctl(RTFileToNative(pThis->Os.hFileDevice), FDPOLLDRVSTAT, &DrvStat);
+        if (!rcLnx)
+        {
+            bool fDiskIn = !(DrvStat.flags & (FD_VERIFY | FD_DISK_NEWCHANGE));
+            *pfMediaPresent = fDiskIn;
+
+            if (fDiskIn != pThis->Os.fPrevDiskIn)
+                *pfMediaChanged = true;
+
+            pThis->Os.fPrevDiskIn = fDiskIn;
+        }
+        else
+            rc = RTErrConvertFromErrno(errno);
+    }
+    else
+    {
+        *pfMediaPresent = ioctl(RTFileToNative(pThis->Os.hFileDevice), CDROM_DRIVE_STATUS, CDSL_CURRENT) == CDS_DISC_OK;
+        *pfMediaChanged = false;
+        if (pThis->fMediaPresent != *pfMediaPresent)
+            *pfMediaChanged = ioctl(RTFileToNative(pThis->Os.hFileDevice), CDROM_MEDIA_CHANGED, CDSL_CURRENT) == 1;
+    }
+
+    return rc;
+}
+
+
+DECLHIDDEN(void) drvHostBaseInitOs(PDRVHOSTBASE pThis)
+{
+    pThis->Os.hFileDevice    = NIL_RTFILE;
+    pThis->Os.pbDoubleBuffer = NULL;
+    pThis->Os.fPrevDiskIn    = false;
+}
+
+
+DECLHIDDEN(int) drvHostBaseOpenOs(PDRVHOSTBASE pThis, bool fReadOnly)
+{
+    uint32_t fFlags = (fReadOnly ? RTFILE_O_READ : RTFILE_O_READWRITE) | RTFILE_O_OPEN | RTFILE_O_DENY_NONE | RTFILE_O_NON_BLOCK;
+    return RTFileOpen(&pThis->Os.hFileDevice, pThis->pszDevice, fFlags);
+}
+
+
+DECLHIDDEN(int) drvHostBaseMediaRefreshOs(PDRVHOSTBASE pThis)
+{
+    /*
+     * Need to re-open the device because it will kill off any cached data
+     * that Linux for some peculiar reason thinks should survive a media change.
+     */
+    if (pThis->Os.hFileDevice != NIL_RTFILE)
+    {
+        RTFileClose(pThis->Os.hFileDevice);
+        pThis->Os.hFileDevice = NIL_RTFILE;
+    }
+    int rc = drvHostBaseOpenOs(pThis, pThis->fReadOnlyConfig);
+    if (RT_FAILURE(rc))
+    {
+        if (!pThis->fReadOnlyConfig)
+        {
+            LogFlow(("%s-%d: drvHostBaseMediaRefreshOs: '%s' - retry readonly (%Rrc)\n",
+                     pThis->pDrvIns->pReg->szName, pThis->pDrvIns->iInstance, pThis->pszDevice, rc));
+            rc = drvHostBaseOpenOs(pThis, true);
+        }
+        if (RT_FAILURE(rc))
+        {
+            LogFlow(("%s-%d: failed to open device '%s', rc=%Rrc\n",
+                     pThis->pDrvIns->pReg->szName, pThis->pDrvIns->iInstance, pThis->pszDevice, rc));
+            return rc;
+        }
+        pThis->fReadOnly = true;
+    }
+    else
+        pThis->fReadOnly = pThis->fReadOnlyConfig;
+
+    return rc;
+}
+
+
+DECLHIDDEN(bool) drvHostBaseIsMediaPollingRequiredOs(PDRVHOSTBASE pThis)
+{
+    RT_NOREF(pThis);
+    return true; /* On Linux we always use media polling. */
+}
+
+
+DECLHIDDEN(void) drvHostBaseDestructOs(PDRVHOSTBASE pThis)
+{
+    /*
+     * Unlock the drive if we've locked it or we're in passthru mode.
+     */
+    if (    pThis->fLocked
+        &&  pThis->Os.hFileDevice != NIL_RTFILE
+        &&  pThis->pfnDoLock)
+    {
+        int rc = pThis->pfnDoLock(pThis, false);
+        if (RT_SUCCESS(rc))
+            pThis->fLocked = false;
+    }
+
+    if (pThis->Os.pbDoubleBuffer)
+    {
+        RTMemFree(pThis->Os.pbDoubleBuffer);
+        pThis->Os.pbDoubleBuffer = NULL;
+    }
+
+    if (pThis->Os.hFileDevice != NIL_RTFILE)
+    {
+        int rc = RTFileClose(pThis->Os.hFileDevice);
+        AssertRC(rc);
+        pThis->Os.hFileDevice = NIL_RTFILE;
+    }
+}
+