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b6b4fbd90b
linux-next/arch/x86
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Sean Christopherson b6b4fbd90b x86/cpu: Initialize MSR_TSC_AUX if RDTSCP *or* RDPID is supported 
Initialize MSR_TSC_AUX with CPU node information if RDTSCP or RDPID is
supported.  This fixes a bug where vdso_read_cpunode() will read garbage
via RDPID if RDPID is supported but RDTSCP is not.  While no known CPU
supports RDPID but not RDTSCP, both Intel's SDM and AMD's APM allow for
RDPID to exist without RDTSCP, e.g. it's technically a legal CPU model
for a virtual machine.

Note, technically MSR_TSC_AUX could be initialized if and only if RDPID
is supported since RDTSCP is currently not used to retrieve the CPU node.
But, the cost of the superfluous WRMSR is negigible, whereas leaving
MSR_TSC_AUX uninitialized is just asking for future breakage if someone
decides to utilize RDTSCP.

Fixes: a582c540ac ("x86/vdso: Use RDPID in preference to LSL when available")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210504225632.1532621-2-seanjc@google.com
2021-05-05 21:50:14 +02:00
..
boot - turn the stack canary into a normal __percpu variable on 32-bit which 2021-04-27 17:45:09 -07:00
configs module: remove EXPORT_UNUSED_SYMBOL* 2021-02-08 12:28:07 +01:00
crypto Objtool updates in this cycle were: 2021-04-28 12:53:24 -07:00
entry Add Landlock, a new LSM from Mickaël Salaün <mic@linux.microsoft.com> 2021-05-01 18:50:44 -07:00
events IOMMU Updates for Linux v5.13 2021-05-01 09:33:00 -07:00
hyperv The x86 MM changes in this cycle were: 2021-04-29 11:41:43 -07:00
ia32 x86/ia32_signal: Propagate __user annotation properly 2020-12-11 19:44:31 +01:00
include x86: Delete UD0, UD1 traces 2021-05-05 21:50:13 +02:00
kernel x86/cpu: Initialize MSR_TSC_AUX if RDTSCP *or* RDPID is supported 2021-05-05 21:50:14 +02:00
kvm ARM: 2021-05-01 10:14:08 -07:00
lib - turn the stack canary into a normal __percpu variable on 32-bit which 2021-04-27 17:45:09 -07:00
math-emu x86/fpu/math-emu: Fix function cast warning 2021-03-23 00:08:02 +01:00
mm ARM: 2021-05-01 10:14:08 -07:00
net Networking changes for 5.13. 2021-04-29 11:57:23 -07:00
pci x86: Fix various typos in comments 2021-03-18 15:31:53 +01:00
platform - turn the stack canary into a normal __percpu variable on 32-bit which 2021-04-27 17:45:09 -07:00
power - turn the stack canary into a normal __percpu variable on 32-bit which 2021-04-27 17:45:09 -07:00
purgatory crypto: sha - split sha.h into sha1.h and sha2.h 2020-11-20 14:45:33 +11:00
ras
realmode x86: Fix various typos in comments, take #2 2021-03-21 23:50:28 +01:00
tools x86/tools/insn_sanity: Convert to insn_decode() 2021-03-15 12:21:11 +01:00
um um: remove process stub VMA 2021-02-12 21:37:38 +01:00
video
xen The x86 MM changes in this cycle were: 2021-04-29 11:41:43 -07:00
.gitignore
Kbuild
Kconfig mm/memtest: add ARCH_USE_MEMTEST 2021-04-30 11:20:36 -07:00
Kconfig.assembler
Kconfig.cpu
Kconfig.debug x86, libnvdimm/test: Remove COPY_MC_TEST 2020-10-26 18:08:35 +01:00
Makefile Kbuild updates for v5.13 2021-04-29 14:24:39 -07:00
Makefile_32.cpu
Makefile.um