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crypto: ccp: Implement SEV_PDH_CERT_EXPORT ioctl command

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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
Improvements-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Acked-by: Gary R Hook <gary.hook@amd.com>
This commit is contained in:
Brijesh Singh 2017-12-04 10:57:31 -06:00
parent 7360e4b143
commit 76a2b524a4
1 changed files with 97 additions and 0 deletions
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97
drivers/crypto/ccp/psp-dev.c
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@ -443,6 +443,100 @@ e_free:
return ret;
}
static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp)
{
struct sev_user_data_pdh_cert_export input;
void *pdh_blob = NULL, *cert_blob = NULL;
struct sev_data_pdh_cert_export *data;
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 the certificate length. */
if (!input.pdh_cert_address ||
!input.pdh_cert_len ||
!input.cert_chain_address)
goto cmd;
/* Allocate a physically contiguous buffer to store the PDH blob. */
if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
!access_ok(VERIFY_WRITE, input.pdh_cert_address, input.pdh_cert_len)) {
ret = -EFAULT;
goto e_free;
}
/* Allocate a physically contiguous buffer to store the cert chain blob. */
if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
!access_ok(VERIFY_WRITE, input.cert_chain_address, input.cert_chain_len)) {
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 = 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;
cmd:
/* If platform is not in INIT state then transition it to INIT. */
if (psp_master->sev_state != SEV_STATE_INIT) {
ret = __sev_platform_init_locked(&argp->error);
if (ret)
goto e_free_cert;
}
ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
/* If we query the length, FW responded with expected data. */
input.cert_chain_len = data->cert_chain_len;
input.pdh_cert_len = data->pdh_cert_len;
if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
ret = -EFAULT;
goto e_free_cert;
}
if (pdh_blob) {
if (copy_to_user((void __user *)input.pdh_cert_address,
pdh_blob, input.pdh_cert_len)) {
ret = -EFAULT;
goto e_free_cert;
}
}
if (cert_blob) {
if (copy_to_user((void __user *)input.cert_chain_address,
cert_blob, input.cert_chain_len))
ret = -EFAULT;
}
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;
@ -483,6 +577,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
case SEV_PEK_CERT_IMPORT:
ret = sev_ioctl_do_pek_import(&input);
break;
case SEV_PDH_CERT_EXPORT:
ret = sev_ioctl_do_pdh_export(&input);
break;
default:
ret = -EINVAL;
goto out;