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linux/drivers/base
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Pawan Gupta d405b9c03f 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 10:48:21 -04:00
..
firmware_loader firmware_loader: Fix memory leak in firmware upload 2022-09-01 17:47:27 +02:00
power pmdomain: core: Move the unused cleanup to a _sync initcall 2024-02-23 09:12:47 +01:00
regmap regmap: fix bogus error on regcache_sync success 2023-12-13 18:39:20 +01:00
test driver core: test_async: fix an error code 2023-09-13 09:42:53 +02:00
arch_numa.c arm64: irq: set the correct node for VMAP stack 2024-02-05 20:12:46 +00:00
arch_topology.c RISC-V Patches for the 6.1 Merge Window, Part 1 2022-10-09 13:24:01 -07:00
attribute_container.c driver core: attribute_container: fix W=1 warnings 2021-05-14 13:37:10 +02:00
auxiliary.c Documentation/auxiliary_bus: Move the text into the code 2021-12-03 16:41:50 +01:00
base.h driver core: remove make_class_name declaration 2022-09-09 10:49:54 +02:00
bus.c driver: base: fix UAF when driver_attach failed 2022-05-19 19:28:42 +02:00
cacheinfo.c drivers: base: cacheinfo: Fix shared_cpu_map changes in event of CPU hotplug 2023-06-09 10:34:17 +02:00
class.c class: fix possible memory leak in __class_register() 2022-12-31 13:32:38 +01:00
component.c drivers: base: component: fix memory leak with using debugfs_lookup() 2023-03-11 13:55:39 +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 09:12:34 +01:00
cpu.c x86/rfds: Mitigate Register File Data Sampling (RFDS) 2024-03-15 10:48:21 -04:00
dd.c driver core: Release all resources during unbind before updating device links 2023-11-28 17:07:13 +00:00
devcoredump.c devcoredump: Send uevent once devcd is ready 2023-12-13 18:39:28 +01:00
devres.c devres: Slightly optimize alloc_dr() 2022-09-01 18:17:14 +02:00
devtmpfs.c devtmpfs: fix the dangling pointer of global devtmpfsd thread 2022-06-27 16:41:13 +02:00
driver.c driver core: fix driver_set_override() issue with empty strings 2022-09-05 13:01:34 +02:00
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 bus: Make remove callback return void 2021-07-21 11:53:42 +02:00
Kconfig devtmpfs: mount with noexec and nosuid 2021-12-30 13:54:42 +01:00
Makefile driver core: Add sysfs support for physical location of a device 2022-04-27 09:51:57 +02:00
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 2024-01-10 17:10:33 +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 15:27:46 -08:00
physical_location.c driver core: location: Free struct acpi_pld_info *pld before return false 2023-03-10 09:33:33 +01:00
physical_location.h driver core: Add sysfs support for physical location of a device 2022-04-27 09:51:57 +02:00
pinctrl.c driver core: Remove redundant license text 2017-12-07 18:36:44 +01:00
platform-msi.c platform-msi: Export symbol platform_msi_create_irq_domain() 2022-09-28 14:21:05 +01:00
platform.c platform: Provide a remove callback that returns no value 2023-05-24 17:32:43 +01:00
property.c device property: Allow const parameter to dev_fwnode() 2024-01-05 15:18:40 +01:00
soc.c base: soc: Make soc_device_match() simpler and easier to read 2022-03-18 14:28:07 +01:00
swnode.c software node: Let args be NULL in software_node_get_reference_args 2024-01-25 15:27:46 -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 2023-03-10 09:33:34 +01:00