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Pawan Gupta 19daabcfbb x86/rfds: Mitigate Register File Data Sampling (RFDS) 
commit 8076fcde016c9c0e0660543e67bff86cb48a7c9c 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

  [ pawan: - Resolved conflicts in sysfs reporting.
	   - s/ATOM_GRACEMONT/ALDERLAKE_N/ATOM_GRACEMONT is called
	     ALDERLAKE_N in 6.6. ]

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>
2024-11-19 09:22:40 +01:00
..
ABI x86/rfds: Mitigate Register File Data Sampling (RFDS) 2024-11-19 09:22:40 +01:00
accounting Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
admin-guide x86/rfds: Mitigate Register File Data Sampling (RFDS) 2024-11-19 09:22:40 +01:00
arm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
arm64 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
block block: introduce zone_write_granularity limit 2024-11-19 09:22:16 +01:00
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devicetree dt-bindings: nvmem: mxs-ocotp: Document fsl,ocotp 2024-11-18 12:12:01 +01:00
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filesystems rename(): fix the locking of subdirectories 2024-11-18 12:12:59 +01:00
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netlabel Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
networking net: change accept_ra_min_rtr_lft to affect all RA lifetimes 2024-11-08 11:25:47 +01:00
nios2 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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power Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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process overflow: Implement size_t saturating arithmetic helpers 2024-11-18 11:42:47 +01:00
RCU Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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sound ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument 2024-11-18 12:13:17 +01:00
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w1 Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
watchdog Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
x86 x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key 2024-11-19 09:22:40 +01:00
xtensa Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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