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Change History

In the Linux kernel, the following vulnerability has been resolved:

KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak

For some sev ioctl interfaces, the length parameter that is passed maybe
less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data
that PSP firmware returns. In this case, kmalloc will allocate memory
that is the size of the input rather than the size of the data.
Since PSP firmware doesn't fully overwrite the allocated buffer, these
sev ioctl interface may return uninitialized kernel slab memory.

https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee

https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93

https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0

https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403

https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418