From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- drivers/virt/Kconfig | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 drivers/virt/Kconfig (limited to 'drivers/virt/Kconfig') diff --git a/drivers/virt/Kconfig b/drivers/virt/Kconfig new file mode 100644 index 000000000..52eb7e4ba --- /dev/null +++ b/drivers/virt/Kconfig @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Virtualization support drivers +# + +menuconfig VIRT_DRIVERS + bool "Virtualization drivers" + help + Say Y here to get to see options for device drivers that support + virtualization environments. + + If you say N, all options in this submenu will be skipped and disabled. + +if VIRT_DRIVERS + +config VMGENID + tristate "Virtual Machine Generation ID driver" + default y + help + Say Y here to use the hypervisor-provided Virtual Machine Generation ID + to reseed the RNG when the VM is cloned. This is highly recommended if + you intend to do any rollback / cloning / snapshotting of VMs. + + Prefer Y to M so that this protection is activated very early. + +config FSL_HV_MANAGER + tristate "Freescale hypervisor management driver" + depends on FSL_SOC + select EPAPR_PARAVIRT + help + The Freescale hypervisor management driver provides several services + to drivers and applications related to the Freescale hypervisor: + + 1) An ioctl interface for querying and managing partitions. + + 2) A file interface to reading incoming doorbells. + + 3) An interrupt handler for shutting down the partition upon + receiving the shutdown doorbell from a manager partition. + + 4) A kernel interface for receiving callbacks when a managed + partition shuts down. + +source "drivers/virt/vboxguest/Kconfig" + +source "drivers/virt/nitro_enclaves/Kconfig" + +source "drivers/virt/acrn/Kconfig" + +endif + +source "drivers/virt/coco/Kconfig" -- cgit v1.3.1