Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 7360e4b1 authored by Brijesh Singh's avatar Brijesh Singh
Browse files

crypto: ccp: Implement SEV_PEK_CERT_IMPORT ioctl command 



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: default avatarBorislav Petkov <bp@suse.de>
Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Acked-by: default avatarGary R Hook <gary.hook@amd.com>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
parent e7990356

drivers/crypto/ccp/psp-dev.c

+81 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/psp-sev.h

+4 −0
Original line number Diff line number Diff line
@@ -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__ */