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UPSTREAM: KVM: arm64: Fix buffer overflow in kvm_arm_set_fw_reg()

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The KVM_REG_SIZE() comes from the ioctl and it can be a power of two
between 0-32768 but if it is more than sizeof(long) this will corrupt
memory.

Fixes: 99adb56763 ("KVM: arm/arm64: Add save/restore support for firmware workaround state")
Change-Id: Ia01204a3f63bcfc8ac3959c2ac7bbccb2ba64c61
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/4efbab8c-640f-43b2-8ac6-6d68e08280fe@kili.mountain
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
(cherry picked from commit a25bc8486f)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Dan Carpenter
2023-04-19 13:16:13 +03:00
committed by Treehugger Robot
parent 444e7e1227
commit 01df29b641
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kvm/hypercalls.c
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@@ -429,6 +429,8 @@ int kvm_arm_set_fw_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
u64 val;
int wa_level;
if (KVM_REG_SIZE(reg->id) != sizeof(val))
return -ENOENT;
if (copy_from_user(&val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;