Anthony Steinhauser db39004352 x86/speculation: PR_SPEC_FORCE_DISABLE enforcement for indirect branches. ...

[ Upstream commit 4d8df8cbb9 ]

Currently, it is possible to enable indirect branch speculation even after
it was force-disabled using the PR_SPEC_FORCE_DISABLE option. Moreover, the
PR_GET_SPECULATION_CTRL command gives afterwards an incorrect result
(force-disabled when it is in fact enabled). This also is inconsistent
vs. STIBP and the documention which cleary states that
PR_SPEC_FORCE_DISABLE cannot be undone.

Fix this by actually enforcing force-disabled indirect branch
speculation. PR_SPEC_ENABLE called after PR_SPEC_FORCE_DISABLE now fails
with -EPERM as described in the documentation.

Fixes: 9137bb27e6 ("x86/speculation: Add prctl() control for indirect branch speculation")
Signed-off-by: Anthony Steinhauser <asteinhauser@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

2020-06-20 10:24:10 +02:00

..

mcheck

x86/mce/amd: Fix kobject lifetime

2020-02-28 15:42:48 +01:00

microcode

x86/microcode: Update the new microcode revision unconditionally

2019-05-14 19:19:33 +02:00

mtrr

x86/mtrr: Don't copy uninitialized gentry fields back to userspace

2018-12-29 13:40:15 +01:00

.gitignore

Update .gitignore files for generated targets

2008-10-20 11:24:31 -07:00

amd.c

x86/CPU/AMD: Clear RDRAND CPUID bit on AMD family 15h/16h

2019-09-06 10:19:41 +02:00

bugs.c

x86/speculation: PR_SPEC_FORCE_DISABLE enforcement for indirect branches.

2020-06-20 10:24:10 +02:00

centaur.c

x86/cpu: Rename cpu_data.x86_mask to cpu_data.x86_stepping

2018-02-22 15:43:55 +01:00

common.c

x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation

2020-06-11 09:22:23 +02:00

cpu.h

x86/speculation: Add Special Register Buffer Data Sampling (SRBDS) mitigation

2020-06-11 09:22:23 +02:00

cyrix.c

x86/CPU: Use correct macros for Cyrix calls

2019-11-25 09:52:46 +01:00

hypervisor.c

virt, sched: Add generic vCPU pinning support

2016-09-05 13:52:38 +02:00

intel_cacheinfo.c

drivers: base: cacheinfo: fix x86 with CONFIG_OF enabled

2018-01-31 12:55:51 +01:00

intel.c

x86/cpu: Add a "tsx=" cmdline option with TSX disabled by default

2019-11-16 10:29:41 +01:00

Makefile

x86/cpu: Add a "tsx=" cmdline option with TSX disabled by default

2019-11-16 10:29:41 +01:00

match.c

x86/cpu: Add a steppings field to struct x86_cpu_id

2020-06-11 09:22:23 +02:00

mkcapflags.sh

x86/build: Add 'set -e' to mkcapflags.sh to delete broken capflags.c

2019-08-04 09:33:22 +02:00

mshyperv.c

x86/hyperv: Handle unknown NMIs on one CPU when unknown_nmi_panic

2017-03-22 12:43:36 +01:00

perfctr-watchdog.c

x86/kernel: Audit and remove any unnecessary uses of module.h

2016-07-14 15:06:41 +02:00

powerflags.c

x86/cpu: Add advanced power management bits

2016-03-29 11:12:11 +02:00

proc.c

x86/cpu: Change type of x86_cache_size variable to unsigned int

2018-02-22 15:43:55 +01:00

rdrand.c

x86, asm: Use CC_SET()/CC_OUT() and static_cpu_has() in archrandom.h

2016-06-08 12:41:20 -07:00

scattered.c

x86/cpufeatures: Add CPUID_7_EDX CPUID leaf

2018-02-13 12:35:58 +01:00

topology.c

x86/cpu/topology: Provide detect_extended_topology_early()

2018-08-15 18:14:46 +02:00

transmeta.c

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-15 09:32:27 -07:00

tsx.c

x86/cpu: Update cached HLE state on write to TSX_CTRL_CPUID_CLEAR

2020-02-14 16:30:58 -05:00

umc.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

vmware.c

x86/vmware: Skip timer_irq_works() check on VMware

2016-10-19 17:36:33 +02:00