https://git.reactos.org/?p=reactos.git;a=commitdiff;h=1744b01ad9e41e57e6450badedeab175166bfac3
commit 1744b01ad9e41e57e6450badedeab175166bfac3 Author: Hervé Poussineau <[email protected]> AuthorDate: Sun Jan 9 09:42:23 2022 +0100 Commit: Hervé Poussineau <[email protected]> CommitDate: Sun Apr 17 08:48:33 2022 +0200 [WIN32SS] Rewrite LDEVOBJ reference counting - introduce LDEVOBJ_vDisableDriver (reversal of LDEVOBJ_bEnableDriver) - introduce LDEVOBJ_bUnloadImage (reversal of LDEVOBJ_pLoadDriver) - introduce LDEVOBJ_vDereference, to remove a reference to a LDEVOBJ Also: - correctly handle success to unload the image, by removing it from pldev list - correctly handle failure to unload the image, by re-enabling the driver - simplify EngUnloadImage, as a wrapper around LDEVOBJ_vDereference - move LDEVOBJ_ulGetDriverModes lower to prevent forward declaration of LDEVOBJ_vDereference Unfortunately, disable driver unloading as long as ntoskrnl can't reload a driver it just unloaded... --- win32ss/gdi/eng/ldevobj.c | 244 +++++++++++++++++++++++++++------------------- 1 file changed, 146 insertions(+), 98 deletions(-) diff --git a/win32ss/gdi/eng/ldevobj.c b/win32ss/gdi/eng/ldevobj.c index 6321c8ad88d..03b9223e4a9 100644 --- a/win32ss/gdi/eng/ldevobj.c +++ b/win32ss/gdi/eng/ldevobj.c @@ -160,37 +160,6 @@ LDEVOBJ_bLoadImage( return TRUE; } -static -VOID -LDEVOBJ_vUnloadImage( - _Inout_ PLDEVOBJ pldev) -{ - NTSTATUS Status; - - /* Make sure we have a driver info */ - ASSERT(pldev && pldev->pGdiDriverInfo != NULL); - - /* Check if we have loaded a driver */ - if (pldev->pfn.DisableDriver) - { - /* Call the unload function */ - pldev->pfn.DisableDriver(); - } - - /* Unload the driver */ - Status = ZwSetSystemInformation(SystemUnloadGdiDriverInformation, - &pldev->pGdiDriverInfo->SectionPointer, - sizeof(HANDLE)); - if (!NT_SUCCESS(Status)) - { - ERR("Failed to unload the driver, this is bad.\n"); - } - - /* Free the driver info structure */ - ExFreePoolWithTag(pldev->pGdiDriverInfo, GDITAG_LDEV); - pldev->pGdiDriverInfo = NULL; -} - static BOOL LDEVOBJ_bEnableDriver( @@ -200,7 +169,10 @@ LDEVOBJ_bEnableDriver( DRVENABLEDATA ded; ULONG i; + TRACE("LDEVOBJ_bEnableDriver('%wZ')\n", &pldev->pGdiDriverInfo->DriverName); + ASSERT(pldev); + ASSERT(pldev->cRefs == 0); /* Call the drivers DrvEnableDriver function */ RtlZeroMemory(&ded, sizeof(ded)); @@ -223,58 +195,21 @@ LDEVOBJ_bEnableDriver( return TRUE; } -ULONG -LDEVOBJ_ulGetDriverModes( - _In_ LPWSTR pwszDriverName, - _In_ HANDLE hDriver, - _Out_ PDEVMODEW *ppdm) +static +VOID +LDEVOBJ_vDisableDriver( + _Inout_ PLDEVOBJ pldev) { - PLDEVOBJ pldev = NULL; - ULONG cbSize = 0; - PDEVMODEW pdm = NULL; - - TRACE("LDEVOBJ_ulGetDriverModes('%ls', %p)\n", pwszDriverName, hDriver); - - pldev = LDEVOBJ_pLoadDriver(pwszDriverName, LDEV_DEVICE_DISPLAY); - if (!pldev) - goto cleanup; - - /* Mirror drivers may omit this function */ - if (!pldev->pfn.GetModes) - goto cleanup; - - /* Call the driver to get the required size */ - cbSize = pldev->pfn.GetModes(hDriver, 0, NULL); - if (!cbSize) - { - ERR("DrvGetModes returned 0\n"); - goto cleanup; - } + ASSERT(pldev); + ASSERT(pldev->cRefs == 0); - /* Allocate a buffer for the DEVMODE array */ - pdm = ExAllocatePoolWithTag(PagedPool, cbSize, GDITAG_DEVMODE); - if (!pdm) - { - ERR("Could not allocate devmodeinfo\n"); - goto cleanup; - } + TRACE("LDEVOBJ_vDisableDriver('%wZ')\n", &pldev->pGdiDriverInfo->DriverName); - /* Call the driver again to fill the buffer */ - cbSize = pldev->pfn.GetModes(hDriver, cbSize, pdm); - if (!cbSize) + if (pldev->pfn.DisableDriver) { - /* Could not get modes */ - ERR("DrvrGetModes returned 0 on second call\n"); - ExFreePoolWithTag(pdm, GDITAG_DEVMODE); - pdm = NULL; + /* Call the unload function */ + pldev->pfn.DisableDriver(); } - -cleanup: - if (pldev) - LDEVOBJ_vUnloadImage(pldev); - - *ppdm = pdm; - return cbSize; } static @@ -323,6 +258,41 @@ LDEVOBJ_pvFindImageProcAddress( return pvProcAdress; } +static +BOOL +LDEVOBJ_bUnloadImage( + _Inout_ PLDEVOBJ pldev) +{ + NTSTATUS Status; + + /* Make sure we have a driver info */ + ASSERT(pldev && pldev->pGdiDriverInfo != NULL); + ASSERT(pldev->cRefs == 0); + + TRACE("LDEVOBJ_bUnloadImage('%wZ')\n", &pldev->pGdiDriverInfo->DriverName); + + /* Unload the driver */ +#if 0 + Status = ZwSetSystemInformation(SystemUnloadGdiDriverInformation, + &pldev->pGdiDriverInfo->SectionPointer, + sizeof(HANDLE)); +#else + /* Unfortunately, ntoskrnl allows unloading a driver, but fails loading + * it again with STATUS_IMAGE_ALREADY_LOADED. Prevent this problem by + * never unloading any driver. + */ + UNIMPLEMENTED; + Status = STATUS_NOT_IMPLEMENTED; +#endif + if (!NT_SUCCESS(Status)) + return FALSE; + + ExFreePoolWithTag(pldev->pGdiDriverInfo, GDITAG_LDEV); + pldev->pGdiDriverInfo = NULL; + + return TRUE; +} + PLDEVOBJ LDEVOBJ_pLoadInternal( _In_ PFN_DrvEnableDriver pfnEnableDriver, @@ -469,7 +439,7 @@ LDEVOBJ_pLoadDriver( ERR("LDEVOBJ_bEnableDriver failed\n"); /* Unload the image. */ - LDEVOBJ_vUnloadImage(pldev); + LDEVOBJ_bUnloadImage(pldev); LDEVOBJ_vFreeLDEV(pldev); pldev = NULL; goto leave; @@ -491,6 +461,102 @@ leave: return pldev; } +static +VOID +LDEVOBJ_vDereference( + _Inout_ PLDEVOBJ pldev) +{ + /* Lock loader */ + EngAcquireSemaphore(ghsemLDEVList); + + /* Decrement reference count */ + ASSERT(pldev->cRefs > 0); + pldev->cRefs--; + + /* More references left? */ + if (pldev->cRefs > 0) + { + EngReleaseSemaphore(ghsemLDEVList); + return; + } + + LDEVOBJ_vDisableDriver(pldev); + + if (LDEVOBJ_bUnloadImage(pldev)) + { + /* Remove ldev from the list */ + RemoveEntryList(&pldev->leLink); + + /* Free the driver info structure */ + LDEVOBJ_vFreeLDEV(pldev); + } + else + { + WARN("Failed to unload driver '%wZ', trying to re-enable it.\n", &pldev->pGdiDriverInfo->DriverName); + LDEVOBJ_bEnableDriver(pldev, pldev->pGdiDriverInfo->EntryPoint); + + /* Increment again reference count */ + pldev->cRefs++; + } + + /* Unlock loader */ + EngReleaseSemaphore(ghsemLDEVList); +} + +ULONG +LDEVOBJ_ulGetDriverModes( + _In_ LPWSTR pwszDriverName, + _In_ HANDLE hDriver, + _Out_ PDEVMODEW *ppdm) +{ + PLDEVOBJ pldev = NULL; + ULONG cbSize = 0; + PDEVMODEW pdm = NULL; + + TRACE("LDEVOBJ_ulGetDriverModes('%ls', %p)\n", pwszDriverName, hDriver); + + pldev = LDEVOBJ_pLoadDriver(pwszDriverName, LDEV_DEVICE_DISPLAY); + if (!pldev) + goto cleanup; + + /* Mirror drivers may omit this function */ + if (!pldev->pfn.GetModes) + goto cleanup; + + /* Call the driver to get the required size */ + cbSize = pldev->pfn.GetModes(hDriver, 0, NULL); + if (!cbSize) + { + ERR("DrvGetModes returned 0\n"); + goto cleanup; + } + + /* Allocate a buffer for the DEVMODE array */ + pdm = ExAllocatePoolWithTag(PagedPool, cbSize, GDITAG_DEVMODE); + if (!pdm) + { + ERR("Could not allocate devmodeinfo\n"); + goto cleanup; + } + + /* Call the driver again to fill the buffer */ + cbSize = pldev->pfn.GetModes(hDriver, cbSize, pdm); + if (!cbSize) + { + /* Could not get modes */ + ERR("DrvrGetModes returned 0 on second call\n"); + ExFreePoolWithTag(pdm, GDITAG_DEVMODE); + pdm = NULL; + } + +cleanup: + if (pldev) + LDEVOBJ_vDereference(pldev); + + *ppdm = pdm; + return cbSize; +} + BOOL LDEVOBJ_bBuildDevmodeList( _Inout_ PGRAPHICS_DEVICE pGraphicsDevice) @@ -691,25 +757,7 @@ EngUnloadImage( /* Make sure the LDEV is in the list */ ASSERT((pldev->leLink.Flink != NULL) && (pldev->leLink.Blink != NULL)); - /* Lock loader */ - EngAcquireSemaphore(ghsemLDEVList); - - /* Decrement reference count */ - pldev->cRefs--; - - /* No more references left? */ - if (pldev->cRefs == 0) - { - /* Remove ldev from the list */ - RemoveEntryList(&pldev->leLink); - - /* Unload the image and free the LDEV */ - LDEVOBJ_vUnloadImage(pldev); - LDEVOBJ_vFreeLDEV(pldev); - } - - /* Unlock loader */ - EngReleaseSemaphore(ghsemLDEVList); + LDEVOBJ_vDereference(pldev); }
