static int VBoxDrvLinuxIOCtl(struct inode *pInode, struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
#endif
{
/*
* Deal with the two high-speed IOCtl that takes it's arguments from
* the session and iCmd, and only returns a VBox status code.
*/
#ifdef HAVE_UNLOCKED_IOCTL
if (RT_LIKELY( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
|| uCmd == SUP_IOCTL_FAST_DO_HWACC_RUN
|| uCmd == SUP_IOCTL_FAST_DO_NOP))
return supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
return VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg);
#else /* !HAVE_UNLOCKED_IOCTL */
int rc;
unlock_kernel();
if (RT_LIKELY( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
|| uCmd == SUP_IOCTL_FAST_DO_HWACC_RUN
|| uCmd == SUP_IOCTL_FAST_DO_NOP))
rc = supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, (PSUPDRVSESSION)pFilp->private_data);
else
rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg);
lock_kernel();
return rc;
#endif /* !HAVE_UNLOCKED_IOCTL */
}
static int VBoxDrvLinuxIOCtl(struct inode *pInode, struct file *pFilp, unsigned int uCmd, unsigned long ulArg)
#endif
{
PSUPDRVSESSION pSession = (PSUPDRVSESSION)pFilp->private_data;
int rc;
#if defined(VBOX_STRICT) || defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
RTCCUINTREG fSavedEfl;
/*
* Refuse all I/O control calls if we've ever detected EFLAGS.AC being cleared.
*
* This isn't a problem, as there is absolutely nothing in the kernel context that
* depend on user context triggering cleanups. That would be pretty wild, right?
*/
if (RT_UNLIKELY(g_DevExt.cBadContextCalls > 0))
{
SUPR0Printf("VBoxDrvLinuxIOCtl: EFLAGS.AC=0 detected %u times, refusing all I/O controls!\n", g_DevExt.cBadContextCalls);
return ESPIPE;
}
fSavedEfl = ASMAddFlags(X86_EFL_AC);
# else
stac();
# endif
/*
* Deal with the two high-speed IOCtl that takes it's arguments from
* the session and iCmd, and only returns a VBox status code.
*/
#ifdef HAVE_UNLOCKED_IOCTL
if (RT_LIKELY( ( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
|| uCmd == SUP_IOCTL_FAST_DO_HM_RUN
|| uCmd == SUP_IOCTL_FAST_DO_NOP)
&& pSession->fUnrestricted == true))
rc = supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, pSession);
else
rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg, pSession);
#else /* !HAVE_UNLOCKED_IOCTL */
unlock_kernel();
if (RT_LIKELY( ( uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
|| uCmd == SUP_IOCTL_FAST_DO_HM_RUN
|| uCmd == SUP_IOCTL_FAST_DO_NOP)
&& pSession->fUnrestricted == true))
rc = supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, pSession);
else
rc = VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg, pSession);
lock_kernel();
#endif /* !HAVE_UNLOCKED_IOCTL */
#if defined(VBOX_STRICT) || defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
/*
* Before we restore AC and the rest of EFLAGS, check if the IOCtl handler code
* accidentially modified it or some other important flag.
*/
if (RT_UNLIKELY( (ASMGetFlags() & (X86_EFL_AC | X86_EFL_IF | X86_EFL_DF | X86_EFL_IOPL))
!= ((fSavedEfl & (X86_EFL_AC | X86_EFL_IF | X86_EFL_DF | X86_EFL_IOPL)) | X86_EFL_AC) ))
{
char szTmp[48];
RTStrPrintf(szTmp, sizeof(szTmp), "uCmd=%#x: %#x->%#x!", _IOC_NR(uCmd), (uint32_t)fSavedEfl, (uint32_t)ASMGetFlags());
supdrvBadContext(&g_DevExt, "SUPDrv-linux.c", __LINE__, szTmp);
}
ASMSetFlags(fSavedEfl);
#else
clac();
#endif
return rc;
}
