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crypto: ccp: Implement SEV_PEK_CERT_IMPORT ioctl command

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The SEV_PEK_CERT_IMPORT command can be used to import the signed PEK
certificate. The command is defined in SEV spec section 5.8.

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>
Reviewed-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Brijesh Singh 2017-12-04 10:57:31 -06:00
parent e799035609
commit 7360e4b143
2 changed files with 85 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
drivers/crypto/ccp/psp-dev.c
View File

@ -365,6 +365,84 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
return ret;
}
void *psp_copy_user_blob(u64 __user uaddr, u32 len)
{
void *data;
if (!uaddr || !len)
return ERR_PTR(-EINVAL);
/* verify that blob length does not exceed our limit */
if (len > SEV_FW_BLOB_MAX_SIZE)
return ERR_PTR(-EINVAL);
data = kmalloc(len, GFP_KERNEL);
if (!data)
return ERR_PTR(-ENOMEM);
if (copy_from_user(data, (void __user *)(uintptr_t)uaddr, len))
goto e_free;
return data;
e_free:
kfree(data);
return ERR_PTR(-EFAULT);
}
EXPORT_SYMBOL_GPL(psp_copy_user_blob);
static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp)
{
struct sev_user_data_pek_cert_import input;
struct sev_data_pek_cert_import *data;
void *pek_blob, *oca_blob;
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;
/* copy PEK certificate blobs from userspace */
pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
if (IS_ERR(pek_blob)) {
ret = PTR_ERR(pek_blob);
goto e_free;
}
data->pek_cert_address = __psp_pa(pek_blob);
data->pek_cert_len = input.pek_cert_len;
/* copy PEK certificate blobs from userspace */
oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
if (IS_ERR(oca_blob)) {
ret = PTR_ERR(oca_blob);
goto e_free_pek;
}
data->oca_cert_address = __psp_pa(oca_blob);
data->oca_cert_len = input.oca_cert_len;
/* 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_oca;
}
ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
e_free_oca:
kfree(oca_blob);
e_free_pek:
kfree(pek_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;
@ -402,6 +480,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
case SEV_PEK_CSR:
ret = sev_ioctl_do_pek_csr(&input);
break;
case SEV_PEK_CERT_IMPORT:
ret = sev_ioctl_do_pek_import(&input);
break;
default:
ret = -EINVAL;
goto out;

4
include/linux/psp-sev.h
View File

@ -576,6 +576,8 @@ int sev_guest_df_flush(int *error);
*/
int sev_guest_decommission(struct sev_data_decommission *data, int *error);
void *psp_copy_user_blob(u64 __user uaddr, u32 len);
#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
static inline int
@ -597,6 +599,8 @@ static inline int sev_guest_df_flush(int *error) { return -ENODEV; }
static inline int
sev_issue_cmd_external_user(struct file *filep, unsigned int id, void *data, int *error) { return -ENODEV; }
static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_PTR(-EINVAL); }
#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
#endif /* __PSP_SEV_H__ */