Daniel Sneddon 348a89e201 x86/speculation: Add Gather Data Sampling mitigation ... commit 8974eb5882 upstream Gather Data Sampling (GDS) is a hardware vulnerability which allows unprivileged speculative access to data which was previously stored in vector registers. Intel processors that support AVX2 and AVX512 have gather instructions that fetch non-contiguous data elements from memory. On vulnerable hardware, when a gather instruction is transiently executed and encounters a fault, stale data from architectural or internal vector registers may get transiently stored to the destination vector register allowing an attacker to infer the stale data using typical side channel techniques like cache timing attacks. This mitigation is different from many earlier ones for two reasons. First, it is enabled by default and a bit must be set to *DISABLE* it. This is the opposite of normal mitigation polarity. This means GDS can be mitigated simply by updating microcode and leaving the new control bit alone. Second, GDS has a "lock" bit. This lock bit is there because the mitigation affects the hardware security features KeyLocker and SGX. It needs to be enabled and *STAY* enabled for these features to be mitigated against GDS. The mitigation is enabled in the microcode by default. Disable it by setting gather_data_sampling=off or by disabling all mitigations with mitigations=off. The mitigation status can be checked by reading: /sys/devices/system/cpu/vulnerabilities/gather_data_sampling Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-08-08 19:58:32 +02:00
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configfs-usb-gadget-uvc	usb: gadget: uvc: Make bSourceID read/write	2023-03-11 13:57:37 +01:00
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sysfs-ata	ata: libata-transport: fix {dma|pio|xfer}_mode sysfs files	2022-06-14 18:36:25 +02:00
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sysfs-bus-iio	iio: ABI: Fix wrong format of differential capacitance channel ABI.	2022-10-26 12:35:02 +02:00
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sysfs-bus-iio-temperature-max31856	…
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sysfs-bus-iio-vf610	iio: adc: vf610: fix conversion mode sysfs node name	2022-06-29 09:03:26 +02:00
sysfs-bus-intel_th-devices-gth	…
sysfs-bus-intel_th-devices-msc	…
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sysfs-bus-spi-devices-spi-nor	mtd: spi-nor: hide jedec_id sysfs attribute if not present	2022-12-31 13:14:11 +01:00
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sysfs-devices-system-cpu	x86/speculation: Add Gather Data Sampling mitigation	2023-08-08 19:58:32 +02:00
sysfs-devices-system-ibm-rtl	…
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sysfs-driver-samsung-laptop	…
sysfs-driver-st	…
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sysfs-driver-xen-blkback	xen-blkback: Apply 'feature_persistent' parameter when connect	2022-08-17 14:24:28 +02:00
sysfs-driver-xen-blkfront	xen-blkfront: Apply 'feature_persistent' parameter when connect	2022-08-17 14:24:28 +02:00
sysfs-firmware-acpi	…
sysfs-firmware-dmi-entries	…
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sysfs-firmware-efi	…
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sysfs-firmware-efi-runtime-map	…
sysfs-firmware-gsmi	…
sysfs-firmware-lefi-boardinfo	…
sysfs-firmware-log	…
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sysfs-firmware-turris-mox-rwtm	…
sysfs-fs-ext4	…
sysfs-fs-f2fs	f2fs: don't get FREEZE lock in f2fs_evict_inode in frozen fs	2022-04-08 14:23:58 +02:00
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sysfs-kernel-mm-numa	mm/migrate: add sysfs interface to enable reclaim migration	2021-09-03 09:58:16 -07:00
sysfs-kernel-mm-swap	…
sysfs-kernel-oops_count	exit: Expose "oops_count" to sysfs	2023-02-01 08:27:21 +01:00
sysfs-kernel-reboot	…
sysfs-kernel-slab	…
sysfs-kernel-vmcoreinfo	…
sysfs-kernel-warn_count	docs: Fix path paste-o for /sys/kernel/warn_count	2023-02-01 08:27:22 +01:00
sysfs-memory-page-offline	…
sysfs-module	…
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