From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- 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