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linux/drivers/base
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Pawan Gupta 77018fb9ef x86/rfds: Mitigate Register File Data Sampling (RFDS) 
commit 8076fcde01 upstream.

RFDS is a CPU vulnerability that may allow userspace to infer kernel
stale data previously used in floating point registers, vector registers
and integer registers. RFDS only affects certain Intel Atom processors.

Intel released a microcode update that uses VERW instruction to clear
the affected CPU buffers. Unlike MDS, none of the affected cores support
SMT.

Add RFDS bug infrastructure and enable the VERW based mitigation by
default, that clears the affected buffers just before exiting to
userspace. Also add sysfs reporting and cmdline parameter
"reg_file_data_sampling" to control the mitigation.

For details see:
Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-03-15 10:48:22 -04:00
..
firmware_loader firmware_loader: Fix a NULL vs IS_ERR() check 2023-05-31 20:31:00 +01:00
power pmdomain: core: Move the unused cleanup to a _sync initcall 2024-02-23 09:25:17 +01:00
regmap regmap: fix bogus error on regcache_sync success 2023-12-13 18:45:24 +01:00
test drivers: base: test: Add missing MODULE_* macros to root device tests 2023-08-16 19:01:29 +02:00
arch_numa.c arm64: irq: set the correct node for VMAP stack 2024-02-05 20:14:14 +00:00
arch_topology.c arch_topology: Remove early cacheinfo error message if -ENOENT 2023-04-14 10:13:38 +01:00
attribute_container.c driver core: attribute_container: fix W=1 warnings 2021-05-14 13:37:10 +02:00
auxiliary.c driver core: make struct bus_type.uevent() take a const * 2023-01-27 13:45:52 +01:00
base.h driver core: class: make class_register() take a const * 2023-04-03 21:42:46 +02:00
bus.c driver core: bus: constify bus_get() 2023-03-23 13:21:24 +01:00
cacheinfo.c drivers: base: cacheinfo: Update cpu_map_populated during CPU Hotplug 2023-05-31 20:36:47 +01:00
class.c class: fix use-after-free in class_register() 2024-01-25 15:35:41 -08:00
component.c drivers: base: component: fix memory leak with using debugfs_lookup() 2023-02-08 13:33:10 +01:00
container.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
core.c driver core: fw_devlink: Improve detection of overlapping cycles 2024-02-23 09:24:57 +01:00
cpu.c x86/rfds: Mitigate Register File Data Sampling (RFDS) 2024-03-15 10:48:22 -04:00
dd.c driver core: Release all resources during unbind before updating device links 2023-11-28 17:20:05 +00:00
devcoredump.c devcoredump: Send uevent once devcd is ready 2023-12-13 18:45:33 +01:00
devres.c drivers/base: use ARCH_DMA_MINALIGN instead of ARCH_KMALLOC_MINALIGN 2023-06-19 16:19:20 -07:00
devtmpfs.c driver core: clean up the logic to determine which /sys/dev/ directory to use 2023-03-31 17:45:07 +02:00
driver.c driver core: create bus_is_registered() 2023-02-09 10:43:35 +01:00
firmware.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
hypervisor.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
init.c init: Initialize noop_backing_dev_info early 2022-06-16 10:55:57 +02:00
isa.c isa: Remove unnecessary checks 2023-05-31 19:03:39 +01:00
Kconfig driver core: Add CONFIG_FW_DEVLINK_SYNC_STATE_TIMEOUT 2023-03-28 18:45:59 +02:00
Makefile genirq: Get rid of GENERIC_MSI_IRQ_DOMAIN 2022-11-17 15:15:20 +01:00
map.c driver: base: Prefer unsigned int to bare use of unsigned 2021-07-21 17:30:09 +02:00
memory.c mm/memory_hotplug: add missing mem_hotplug_lock 2023-12-13 18:45:24 +01:00
module.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
node.c base/node.c: initialize the accessor list before registering 2024-01-25 15:35:51 -08:00
physical_location.c driver core: location: Free struct acpi_pld_info *pld before return false 2023-01-20 14:20:30 +01:00
physical_location.h driver core: physical_location.h remove extern from function prototypes 2023-03-24 15:35:48 +01:00
pinctrl.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
platform-msi.c genirq/msi, platform-msi: Ensure that MSI descriptors are unreferenced 2023-03-02 18:09:44 +01:00
platform.c of: Move of_platform_register_reconfig_notifier() into DT core 2023-08-04 11:36:33 -06:00
property.c drivers: fwnode: fix fwnode_irq_get[_byname]() 2023-06-15 13:37:35 +02:00
soc.c base: soc: populate machine name in soc_device_register if empty 2023-03-29 12:21:23 +02:00
swnode.c software node: Let args be NULL in software_node_get_reference_args 2024-01-25 15:35:51 -08:00
syscore.c syscore: Use pm_pr_dbg() for syscore_{suspend,resume}() 2020-09-08 13:32:06 +02:00
topology.c drivers/base: fix userspace break from using bin_attributes for cpumap and cpulist 2022-07-15 17:36:33 +02:00
trace.c devres: Enable trace events 2021-06-15 17:14:36 +02:00
trace.h devres: Enable trace events 2021-06-15 17:14:36 +02:00
transport_class.c drivers: base: transport_class: fix resource leak when transport_add_device() fails 2023-01-20 14:22:53 +01:00