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Commit e7990356 authored by Brijesh Singh's avatar Brijesh Singh
Browse files

crypto: ccp: Implement SEV_PEK_CSR ioctl command 



The SEV_PEK_CSR command can be used to generate a PEK certificate
signing request. The command is defined in SEV spec section 5.7.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-crypto@vger.kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Improvements-by: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Acked-by: default avatarGary R Hook <gary.hook@amd.com>
parent 77f65327

drivers/crypto/ccp/psp-dev.c

+66 −0
Original line number Diff line number Diff line
@@ -302,6 +302,69 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp) 
	return __sev_do_cmd_locked(cmd, 0, &argp->error);

}



static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)

{

	struct sev_user_data_pek_csr input;

	struct sev_data_pek_csr *data;

	void *blob = NULL;

	int ret;



	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))

		return -EFAULT;



	data = kzalloc(sizeof(*data), GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	/* userspace wants to query CSR length */

	if (!input.address || !input.length)

		goto cmd;



	/* allocate a physically contiguous buffer to store the CSR blob */

	if (!access_ok(VERIFY_WRITE, input.address, input.length) ||

	    input.length > SEV_FW_BLOB_MAX_SIZE) {

		ret = -EFAULT;

		goto e_free;

	}



	blob = kmalloc(input.length, GFP_KERNEL);

	if (!blob) {

		ret = -ENOMEM;

		goto e_free;

	}



	data->address = __psp_pa(blob);

	data->len = input.length;



cmd:

	if (psp_master->sev_state == SEV_STATE_UNINIT) {

		ret = __sev_platform_init_locked(&argp->error);

		if (ret)

			goto e_free_blob;

	}



	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);



	 /* If we query the CSR length, FW responded with expected data. */

	input.length = data->len;



	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {

		ret = -EFAULT;

		goto e_free_blob;

	}



	if (blob) {

		if (copy_to_user((void __user *)input.address, blob, input.length))

			ret = -EFAULT;

	}



e_free_blob:

	kfree(blob);

e_free:

	kfree(data);

	return ret;

}



static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)

{

	void __user *argp = (void __user *)arg;
@@ -336,6 +399,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) 
	case SEV_PDH_GEN:

		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);

		break;

	case SEV_PEK_CSR:

		ret = sev_ioctl_do_pek_csr(&input);

		break;

	default:

		ret = -EINVAL;

		goto out;