[edk2-devel] [PATCH v2 07/11] OvmfPkg/QemuKernelLoaderFsDxe: call VerifyBlob after fetch from fw_cfg

[Brijesh Singh via groups.io]

On 7/6/21 3:54 AM, Dov Murik wrote:
> In QemuKernelLoaderFsDxeEntrypoint we use FetchBlob to read the content
> of the kernel/initrd/cmdline from the QEMU fw_cfg interface.  Insert a
> call to VerifyBlob after fetching to allow BlobVerifierLib
> implementations to add a verification step for these blobs.
>
> This will allow confidential computing OVMF builds to add verification
> mechanisms for these blobs that originate from an untrusted source
> (QEMU).
>
> The null implementation of BlobVerifierLib does nothing in VerifyBlob,
> and therefore no functional change is expected.
>
> Cc: Laszlo Ersek <lersek at redhat.com>
> Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
> Cc: Jordan Justen <jordan.l.justen at intel.com>
> Cc: Ashish Kalra <ashish.kalra at amd.com>
> Cc: Brijesh Singh <brijesh.singh at amd.com>
> Cc: Erdem Aktas <erdemaktas at google.com>
> Cc: James Bottomley <jejb at linux.ibm.com>
> Cc: Jiewen Yao <jiewen.yao at intel.com>
> Cc: Min Xu <min.m.xu at intel.com>
> Cc: Tom Lendacky <thomas.lendacky at amd.com>
> Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3457
> Co-developed-by: James Bottomley <jejb at linux.ibm.com>
> Signed-off-by: James Bottomley <jejb at linux.ibm.com>
> Signed-off-by: Dov Murik <dovmurik at linux.ibm.com>

The patch itself is okay. Just curious, do we also need to add a
verification for the QEMU FW cfg file ?



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