]> git.baikalelectronics.ru Git - kernel.git/commit
arm/arm64: KVM: Feed initialized memory to MMIO accesses
authorMarc Zyngier <marc.zyngier@arm.com>
Mon, 15 Feb 2016 17:04:04 +0000 (17:04 +0000)
committerMarc Zyngier <marc.zyngier@arm.com>
Wed, 24 Feb 2016 11:53:09 +0000 (11:53 +0000)
commitf495680835f6e804fadcc103e15c050257004e94
tree1e2326fcf2543367d7b7b47166eb2191224940e2
parent87ddf7a870bc38532c776cc082b95c78aea30195
arm/arm64: KVM: Feed initialized memory to MMIO accesses

On an MMIO access, we always copy the on-stack buffer info
the shared "run" structure, even if this is a read access.
This ends up leaking up to 8 bytes of uninitialized memory
into userspace, depending on the size of the access.

An obvious fix for this one is to only perform the copy if
this is an actual write.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
arch/arm/kvm/mmio.c