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Jim Mattson 018685461a kvm: LAPIC: Restore guard to prevent illegal APIC register access 
[ Upstream commit 218bf772bddd221489c38dde6ef8e917131161f6 ]

Per the SDM, "any access that touches bytes 4 through 15 of an APIC
register may cause undefined behavior and must not be executed."
Worse, such an access in kvm_lapic_reg_read can result in a leak of
kernel stack contents. Prior to commit 01402cf810 ("kvm: LAPIC:
write down valid APIC registers"), such an access was explicitly
disallowed. Restore the guard that was removed in that commit.

Fixes: 01402cf810 ("kvm: LAPIC: write down valid APIC registers")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Message-Id: <20210602205224.3189316-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-06-23 14:42:41 +02:00
..
alpha
arc ARC: mm: Use max_high_pfn as a HIGHMEM zone border 2021-05-19 10:13:10 +02:00
arm ARM: OMAP2+: Fix build warning when mmc_omap is not built 2021-06-18 10:00:04 +02:00
arm64 KVM: arm64: Fix debug register indexing 2021-06-10 13:39:28 +02:00
c6x
csky csky: change a Kconfig symbol name to fix e1000 build error 2021-04-28 13:40:02 +02:00
h8300
hexagon
ia64 tweewide: Fix most Shebang lines 2021-05-22 11:40:55 +02:00
m68k m68k: Add missing mmap_read_lock() to sys_cacheflush() 2021-05-14 09:50:19 +02:00
microblaze
mips MIPS: Fix kernel hang under FUNCTION_GRAPH_TRACER and PREEMPT_TRACER 2021-06-16 12:01:37 +02:00
nds32 nds32: flush_dcache_page: use page_mapping_file to avoid races with swapoff 2021-04-14 08:41:58 +02:00
nios2
openrisc openrisc: Define memory barrier mb 2021-06-03 09:00:44 +02:00
parisc parisc: avoid a warning on u8 cast for cmpxchg on u8 pointers 2021-04-14 08:41:59 +02:00
powerpc powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers 2021-06-16 12:01:38 +02:00
riscv riscv: Use -mno-relax when using lld linker 2021-06-18 10:00:04 +02:00
s390 KVM: s390: extend kvm_s390_shadow_fault to return entry pointer 2021-05-14 09:50:03 +02:00
sh
sparc
um um: Disable CONFIG_GCOV with MODULES 2021-05-22 11:40:53 +02:00
x86 kvm: LAPIC: Restore guard to prevent illegal APIC register access 2021-06-23 14:42:41 +02:00
xtensa xtensa: move coprocessor_flush to the .text section 2021-04-07 15:00:09 +02:00
.gitignore
Kconfig