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| author | Steven Price <steven.price@arm.com> | 2021-01-08 16:12:54 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-01-21 09:36:23 +0000 |
| commit | e1663372d5ffaa3fc79b7932878c5c860f735412 (patch) | |
| tree | 2deb028365b0aafaae4f106ed3fced176f581112 | |
| parent | 7ba8b4380afbdbb29d53c50bee6563cd7457fc34 (diff) | |
| download | powerpc-e1663372d5ffaa3fc79b7932878c5c860f735412.tar.gz | |
KVM: arm64: Compute TPIDR_EL2 ignoring MTE tag
KASAN in HW_TAGS mode will store MTE tags in the top byte of the
pointer. When computing the offset for TPIDR_EL2 we don't want anything
in the top byte, so remove the tag to ensure the computation is correct
no matter what the tag.
Fixes: 94ab5b61ee16 ("kasan, arm64: enable CONFIG_KASAN_HW_TAGS")
Signed-off-by: Steven Price <steven.price@arm.com>
[maz: added comment]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210108161254.53674-1-steven.price@arm.com
| -rw-r--r-- | arch/arm64/kvm/arm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 04c44853b103b1..fe60d25c000e4f 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1396,8 +1396,9 @@ static void cpu_init_hyp_mode(void) * Calculate the raw per-cpu offset without a translation from the * kernel's mapping to the linear mapping, and store it in tpidr_el2 * so that we can use adr_l to access per-cpu variables in EL2. + * Also drop the KASAN tag which gets in the way... */ - params->tpidr_el2 = (unsigned long)this_cpu_ptr_nvhe_sym(__per_cpu_start) - + params->tpidr_el2 = (unsigned long)kasan_reset_tag(this_cpu_ptr_nvhe_sym(__per_cpu_start)) - (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start)); params->mair_el2 = read_sysreg(mair_el1); |