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Subject[Part2 PATCH v5.1 12.9/31] crypto: ccp: Implement SEV_PDH_CERT_EXPORT ioctl command
Date
The SEV_PDH_CERT_EXPORT command can be used to export the PDH and its
certificate chain. The command is defined in SEV spec section 5.10.

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
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
drivers/crypto/ccp/psp-dev.c | 110 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 110 insertions(+)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 861c44bf2910..0a069e3c7b8c 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -473,6 +473,112 @@ static int sev_ioctl_pek_cert_import(struct sev_issue_cmd *argp)
return ret;
}

+static int sev_ioctl_pdh_cert_export(struct sev_issue_cmd *argp)
+{
+ struct sev_user_data_pdh_cert_export input;
+ struct sev_data_pdh_cert_export *data;
+ int ret, state, need_shutdown = 0;
+ void *pdh_blob, *cert_blob;
+
+ if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data,
+ sizeof(struct sev_user_data_pdh_cert_export)))
+ return -EFAULT;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ pdh_blob = NULL;
+ if (input.pdh_cert_address) {
+ if (!access_ok(VERIFY_WRITE, input.pdh_cert_address, input.pdh_cert_len) ||
+ (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE)) {
+ ret = -EFAULT;
+ goto e_free;
+ }
+
+ pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
+ if (!pdh_blob) {
+ ret = -ENOMEM;
+ goto e_free;
+ }
+
+ data->pdh_cert_address = __psp_pa(pdh_blob);
+ data->pdh_cert_len = input.pdh_cert_len;
+ }
+
+ cert_blob = NULL;
+ if (input.cert_chain_address) {
+ if (!access_ok(VERIFY_WRITE, input.cert_chain_address, input.cert_chain_len) ||
+ (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE)) {
+ ret = -EFAULT;
+ goto e_free_pdh;
+ }
+
+ cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
+ if (!cert_blob) {
+ ret = -ENOMEM;
+ goto e_free_pdh;
+ }
+
+ data->cert_chain_address = __psp_pa(cert_blob);
+ data->cert_chain_len = input.cert_chain_len;
+ }
+
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ goto e_free_cert;
+
+ /*
+ * CERT_EXPORT command can be issued in INIT or WORKING state.
+ * If we are in UNINIT state then transition to INIT.
+ */
+ if (state == SEV_STATE_UNINIT) {
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ goto e_free_cert;
+
+ need_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
+
+ input.cert_chain_len = data->cert_chain_len;
+ input.pdh_cert_len = data->pdh_cert_len;
+
+ /* copy certificate length to userspace */
+ if (copy_to_user((void __user *)(uintptr_t)argp->data, &input,
+ sizeof(struct sev_user_data_pdh_cert_export)))
+ ret = -EFAULT;
+
+ if (ret)
+ goto e_shutdown;
+
+ /* copy PDH certificate to userspace */
+ if (pdh_blob &&
+ copy_to_user((void __user *)(uintptr_t)input.pdh_cert_address,
+ pdh_blob, input.pdh_cert_len)) {
+ ret = -EFAULT;
+ goto e_shutdown;
+ }
+
+ /* copy certificate chain to userspace */
+ if (cert_blob &&
+ copy_to_user((void __user *)(uintptr_t)input.cert_chain_address,
+ cert_blob, input.cert_chain_len))
+ ret = -EFAULT;
+
+e_shutdown:
+ if (need_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+e_free_cert:
+ kfree(cert_blob);
+e_free_pdh:
+ kfree(pdh_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;
@@ -514,6 +620,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
ret = sev_ioctl_pek_cert_import(&input);
break;
}
+ case SEV_PDH_CERT_EXPORT: {
+ ret = sev_ioctl_pdh_cert_export(&input);
+ break;
+ }
default:
ret = -EINVAL;
break;
--
2.9.5
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