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crypto: ccp: Implement SEV_PEK_CSR ioctl command

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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: 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 77f6532722
commit e799035609
1 changed files with 66 additions and 0 deletions
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66
drivers/crypto/ccp/psp-dev.c
View file

@ -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;