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SubjectRe: [Part2 PATCH v5.1 12.9/31] crypto: ccp: Implement SEV_PDH_CERT_EXPORT ioctl command
On Fri, Oct 06, 2017 at 08:06:07PM -0500, Brijesh Singh wrote:
> 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) {

Here...

> + 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) {

... and here please check the full condition where userspace queries the
cert length, like before.

Otherwise, the usual cleanups:

---
diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 5e69add4fea9..331d028f9445 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -476,8 +476,7 @@ static int sev_ioctl_pdh_cert_export(struct sev_issue_cmd *argp)
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)))
+ if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
return -EFAULT;

data = kzalloc(sizeof(*data), GFP_KERNEL);
@@ -536,36 +535,37 @@ static int sev_ioctl_pdh_cert_export(struct sev_issue_cmd *argp)
need_shutdown = 1;
}

- ret = sev_handle_cmd(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
+ ret = sev_do_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)))
+ if (copy_to_user((void __user *)argp->data, &input, sizeof(input)))
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;
+ if (pdh_blob) {
+ if (copy_to_user((void __user *)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;
+ if (cert_blob) {
+ if (copy_to_user((void __user *)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);
+ sev_do_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
e_free_cert:
kfree(cert_blob);
e_free_pdh:
@@ -616,10 +616,9 @@ 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: {
+ case SEV_PDH_CERT_EXPORT:
ret = sev_ioctl_pdh_cert_export(&input);
break;
- }

default:
ret = -EINVAL;
--
Regards/Gruss,
Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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