コード例 #1
0
/**
 * Service request callback function.
 *
 * @returns VBox status code.
 * @param   pSession    The caller's session.
 * @param   u64Arg      64-bit integer argument.
 * @param   pReqHdr     The request header. Input / Output. Optional.
 */
DECLEXPORT(int) TSTRTR0MemUserKernelSrvReqHandler(PSUPDRVSESSION pSession, uint32_t uOperation,
                                                  uint64_t u64Arg, PSUPR0SERVICEREQHDR pReqHdr)
{
    NOREF(pSession);
    if (!VALID_PTR(pReqHdr))
        return VERR_INVALID_PARAMETER;
    char   *pszErr = (char *)(pReqHdr + 1);
    size_t  cchErr = pReqHdr->cbReq - sizeof(*pReqHdr);
    if (cchErr < 32 || cchErr >= 0x10000)
        return VERR_INVALID_PARAMETER;
    *pszErr = '\0';

    /*
     * R3Ptr is valid and good for up to a page. The page before
     * and after are both invalid. Or, it's a kernel page.
     */
    RTR3PTR R3Ptr = (RTR3PTR)u64Arg;
    if (R3Ptr != u64Arg)
        return VERR_INVALID_PARAMETER;

    /*
     * Allocate a kernel buffer.
     */
    uint8_t *pbKrnlBuf = (uint8_t *)RTMemAlloc(PAGE_SIZE * 2);
    if (!pbKrnlBuf)
    {
        RTStrPrintf(pszErr, cchErr, "!no memory for kernel buffers");
        return VINF_SUCCESS;
    }

    /*
     * The big switch.
     */
    switch (uOperation)
    {
        case TSTRTR0MEMUSERKERNEL_SANITY_OK:
            break;

        case TSTRTR0MEMUSERKERNEL_SANITY_FAILURE:
            RTStrPrintf(pszErr, cchErr, "!42failure42%1024s", "");
            break;

        case TSTRTR0MEMUSERKERNEL_BASIC:
        {
            int rc = RTR0MemUserCopyFrom(pbKrnlBuf, R3Ptr, PAGE_SIZE);
            if (rc == VINF_SUCCESS)
            {
                rc = RTR0MemUserCopyTo(R3Ptr, pbKrnlBuf, PAGE_SIZE);
                if (rc == VINF_SUCCESS)
                {
                    if (RTR0MemUserIsValidAddr(R3Ptr))
                    {
                        if (RTR0MemKernelIsValidAddr(pbKrnlBuf))
                        {
                            if (RTR0MemAreKrnlAndUsrDifferent())
                            {
                                RTStrPrintf(pszErr, cchErr, "RTR0MemAreKrnlAndUsrDifferent returns true");
                                if (!RTR0MemUserIsValidAddr((uintptr_t)pbKrnlBuf))
                                {
                                    if (!RTR0MemKernelIsValidAddr((void *)R3Ptr))
                                    {
                                        /* done */
                                    }
                                    else
                                        RTStrPrintf(pszErr, cchErr, "! #5 - RTR0MemKernelIsValidAddr -> true, expected false");
                                }
                                else
                                    RTStrPrintf(pszErr, cchErr, "! #5 - RTR0MemUserIsValidAddr -> true, expected false");
                            }
                            else
                                RTStrPrintf(pszErr, cchErr, "RTR0MemAreKrnlAndUsrDifferent returns false");
                        }
                        else
                            RTStrPrintf(pszErr, cchErr, "! #4 - RTR0MemKernelIsValidAddr -> false, expected true");
                    }
                    else
                        RTStrPrintf(pszErr, cchErr, "! #3 - RTR0MemUserIsValidAddr -> false, expected true");
                }
                else
                    RTStrPrintf(pszErr, cchErr, "! #2 - RTR0MemUserCopyTo -> %Rrc expected %Rrc", rc, VINF_SUCCESS);
            }
            else
                RTStrPrintf(pszErr, cchErr, "! #1 - RTR0MemUserCopyFrom -> %Rrc expected %Rrc", rc, VINF_SUCCESS);
            break;
        }

#define TEST_OFF_SIZE(off, size, rcExpect) \
    if (1) \
    { \
        int rc = RTR0MemUserCopyFrom(pbKrnlBuf, R3Ptr + (off), (size)); \
        if (rc != (rcExpect)) \
        { \
            RTStrPrintf(pszErr, cchErr, "!RTR0MemUserCopyFrom(, +%#x, %#x) -> %Rrc, expected %Rrc", \
                        (off), (size), rc, (rcExpect)); \
            break; \
        } \
        rc = RTR0MemUserCopyTo(R3Ptr + (off), pbKrnlBuf, (size)); \
        if (rc != (rcExpect)) \
        { \
            RTStrPrintf(pszErr, cchErr, "!RTR0MemUserCopyTo(+%#x,, %#x) -> %Rrc, expected %Rrc", \
                        (off), (size), rc, (rcExpect)); \
            break; \
        } \
    } else do {} while (0)

        case TSTRTR0MEMUSERKERNEL_GOOD:
        {
            for (unsigned off = 0; off < 16 && !*pszErr; off++)
                for (unsigned cb = 0; cb < PAGE_SIZE - 16; cb++)
                    TEST_OFF_SIZE(off, cb, VINF_SUCCESS);
            break;
        }

        case TSTRTR0MEMUSERKERNEL_BAD:
        {
            for (unsigned off = 0; off < 16 && !*pszErr; off++)
                for (unsigned cb = 0; cb < PAGE_SIZE - 16; cb++)
                    TEST_OFF_SIZE(off, cb, cb > 0 ? VERR_ACCESS_DENIED : VINF_SUCCESS);
            break;
        }

        case TSTRTR0MEMUSERKERNEL_INVALID_ADDRESS:
        {
            if (    !RTR0MemUserIsValidAddr(R3Ptr)
                &&  RTR0MemKernelIsValidAddr((void *)R3Ptr))
            {
                for (unsigned off = 0; off < 16 && !*pszErr; off++)
                    for (unsigned cb = 0; cb < PAGE_SIZE - 16; cb++)
                        TEST_OFF_SIZE(off, cb, cb > 0 ? VERR_ACCESS_DENIED : VINF_SUCCESS); /* ... */
            }
            else
                RTStrPrintf(pszErr, cchErr, "RTR0MemUserIsValidAddr returns true");
            break;
        }

        default:
            RTStrPrintf(pszErr, cchErr, "!Unknown test #%d", uOperation);
            break;
    }

    /* The error indicator is the '!' in the message buffer. */
    RTMemFree(pbKrnlBuf);
    return VINF_SUCCESS;
}
コード例 #2
0
ファイル: SUPDrv-linux.c プロジェクト: rickysarraf/virtualbox
/**
 * Device I/O Control entry point.
 *
 * @param   pFilp       Associated file pointer.
 * @param   uCmd        The function specified to ioctl().
 * @param   ulArg       The argument specified to ioctl().
 * @param   pSession    The session instance.
 */
static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned long ulArg, PSUPDRVSESSION pSession)
{
    int                 rc;
    SUPREQHDR           Hdr;
    PSUPREQHDR          pHdr;
    uint32_t            cbBuf;

    Log6(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p pid=%d/%d\n", pFilp, uCmd, (void *)ulArg, RTProcSelf(), current->pid));

    /*
     * Read the header.
     */
    if (RT_FAILURE(RTR0MemUserCopyFrom(&Hdr, ulArg, sizeof(Hdr))))
    {
        Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx,) failed; uCmd=%#x\n", ulArg, uCmd));
        return -EFAULT;
    }
    if (RT_UNLIKELY((Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK) != SUPREQHDR_FLAGS_MAGIC))
    {
        Log(("VBoxDrvLinuxIOCtl: bad header magic %#x; uCmd=%#x\n", Hdr.fFlags & SUPREQHDR_FLAGS_MAGIC_MASK, uCmd));
        return -EINVAL;
    }

    /*
     * Buffer the request.
     */
    cbBuf = RT_MAX(Hdr.cbIn, Hdr.cbOut);
    if (RT_UNLIKELY(cbBuf > _1M*16))
    {
        Log(("VBoxDrvLinuxIOCtl: too big cbBuf=%#x; uCmd=%#x\n", cbBuf, uCmd));
        return -E2BIG;
    }
    if (RT_UNLIKELY(_IOC_SIZE(uCmd) ? cbBuf != _IOC_SIZE(uCmd) : Hdr.cbIn < sizeof(Hdr)))
    {
        Log(("VBoxDrvLinuxIOCtl: bad ioctl cbBuf=%#x _IOC_SIZE=%#x; uCmd=%#x\n", cbBuf, _IOC_SIZE(uCmd), uCmd));
        return -EINVAL;
    }
    pHdr = RTMemAlloc(cbBuf);
    if (RT_UNLIKELY(!pHdr))
    {
        OSDBGPRINT(("VBoxDrvLinuxIOCtl: failed to allocate buffer of %d bytes for uCmd=%#x\n", cbBuf, uCmd));
        return -ENOMEM;
    }
    if (RT_FAILURE(RTR0MemUserCopyFrom(pHdr, ulArg, Hdr.cbIn)))
    {
        Log(("VBoxDrvLinuxIOCtl: copy_from_user(,%#lx, %#x) failed; uCmd=%#x\n", ulArg, Hdr.cbIn, uCmd));
        RTMemFree(pHdr);
        return -EFAULT;
    }
    if (Hdr.cbIn < cbBuf)
        RT_BZERO((uint8_t *)pHdr + Hdr.cbIn, cbBuf - Hdr.cbIn);

    /*
     * Process the IOCtl.
     */
    rc = supdrvIOCtl(uCmd, &g_DevExt, pSession, pHdr, cbBuf);

    /*
     * Copy ioctl data and output buffer back to user space.
     */
    if (RT_LIKELY(!rc))
    {
        uint32_t cbOut = pHdr->cbOut;
        if (RT_UNLIKELY(cbOut > cbBuf))
        {
            OSDBGPRINT(("VBoxDrvLinuxIOCtl: too much output! %#x > %#x; uCmd=%#x!\n", cbOut, cbBuf, uCmd));
            cbOut = cbBuf;
        }
        if (RT_FAILURE(RTR0MemUserCopyTo(ulArg, pHdr, cbOut)))
        {
            /* this is really bad! */
            OSDBGPRINT(("VBoxDrvLinuxIOCtl: copy_to_user(%#lx,,%#x); uCmd=%#x!\n", ulArg, cbOut, uCmd));
            rc = -EFAULT;
        }
    }
    else
    {
        Log(("VBoxDrvLinuxIOCtl: pFilp=%p uCmd=%#x ulArg=%p failed, rc=%d\n", pFilp, uCmd, (void *)ulArg, rc));
        rc = -EINVAL;
    }
    RTMemFree(pHdr);

    Log6(("VBoxDrvLinuxIOCtl: returns %d (pid=%d/%d)\n", rc, RTProcSelf(), current->pid));
    return rc;
}