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Kim Phillips 8abcca4816 x86/cpu: Enable STIBP on AMD if Automatic IBRS is enabled 
commit fd470a8beed88440b160d690344fbae05a0b9b1b upstream.

Unlike Intel's Enhanced IBRS feature, AMD's Automatic IBRS does not
provide protection to processes running at CPL3/user mode, see section
"Extended Feature Enable Register (EFER)" in the APM v2 at
https://bugzilla.kernel.org/attachment.cgi?id=304652

Explicitly enable STIBP to protect against cross-thread CPL3
branch target injections on systems with Automatic IBRS enabled.

Also update the relevant documentation.

Fixes: e7862eda309e ("x86/cpu: Support AMD Automatic IBRS")
Reported-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230720194727.67022-1-kim.phillips@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-11-19 09:22:43 +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/cpu: Enable STIBP on AMD if Automatic IBRS is enabled 2024-11-19 09:22:43 +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
bpf Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cdrom Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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crypto Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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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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driver-api Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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fb Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
features Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
filesystems rename(): fix the locking of subdirectories 2024-11-18 12:12:59 +01:00
firmware-guide Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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misc-devices Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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
nvdimm Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
openrisc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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PCI 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
powerpc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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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security Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sh Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sound ASoC: doc: Fix undefined SND_SOC_DAPM_NOPM argument 2024-11-18 12:13:17 +01:00
sparc Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sphinx Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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spi Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
staging Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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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
asm-annotations.rst Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
atomic_bitops.txt Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
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