On 6/4/20 3:09 AM, Herbert Xu wrote:
> This patch fixes a bunch of sparse warnings in sev-dev where the
> __user marking is incorrectly handled.
>
> Reported-by: kbuild test robot <lkp@xxxxxxxxx>
> Fixes: 7360e4b14350 ("crypto: ccp: Implement SEV_PEK_CERT_IMPORT...")
> Fixes: e799035609e1 ("crypto: ccp: Implement SEV_PEK_CSR ioctl...")
> Fixes: 76a2b524a4b1 ("crypto: ccp - introduce SEV_GET_ID2 command")
> Fixes: d6112ea0cb34 ("crypto: ccp - introduce SEV_GET_ID2 command")
> Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Brijesh Singh <brijesh.singh@xxxxxxx>
thanks
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index 439cd737076e..aa576529283b 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -376,6 +376,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
> struct sev_device *sev = psp_master->sev_data;
> struct sev_user_data_pek_csr input;
> struct sev_data_pek_csr *data;
> + void __user *input_address;
> void *blob = NULL;
> int ret;
>
> @@ -394,7 +395,8 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
> goto cmd;
>
> /* allocate a physically contiguous buffer to store the CSR blob */
> - if (!access_ok(input.address, input.length) ||
> + input_address = (void __user *)input.address;
> + if (!access_ok(input_address, input.length) ||
> input.length > SEV_FW_BLOB_MAX_SIZE) {
> ret = -EFAULT;
> goto e_free;
> @@ -427,7 +429,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
> }
>
> if (blob) {
> - if (copy_to_user((void __user *)input.address, blob, input.length))
> + if (copy_to_user(input_address, blob, input.length))
> ret = -EFAULT;
> }
>
> @@ -438,7 +440,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
> return ret;
> }
>
> -void *psp_copy_user_blob(u64 __user uaddr, u32 len)
> +void *psp_copy_user_blob(u64 uaddr, u32 len)
> {
> if (!uaddr || !len)
> return ERR_PTR(-EINVAL);
> @@ -447,7 +449,7 @@ void *psp_copy_user_blob(u64 __user uaddr, u32 len)
> if (len > SEV_FW_BLOB_MAX_SIZE)
> return ERR_PTR(-EINVAL);
>
> - return memdup_user((void __user *)(uintptr_t)uaddr, len);
> + return memdup_user((void __user *)uaddr, len);
> }
> EXPORT_SYMBOL_GPL(psp_copy_user_blob);
>
> @@ -622,6 +624,7 @@ static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
> {
> struct sev_user_data_get_id2 input;
> struct sev_data_get_id *data;
> + void __user *input_address;
> void *id_blob = NULL;
> int ret;
>
> @@ -633,9 +636,10 @@ static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
> return -EFAULT;
>
> /* Check if we have write access to the userspace buffer */
> + input_address = (void __user *)input.address;
> if (input.address &&
> input.length &&
> - !access_ok(input.address, input.length))
> + !access_ok(input_address, input.length))
> return -EFAULT;
>
> data = kzalloc(sizeof(*data), GFP_KERNEL);
> @@ -667,8 +671,7 @@ static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
> }
>
> if (id_blob) {
> - if (copy_to_user((void __user *)input.address,
> - id_blob, data->len)) {
> + if (copy_to_user(input_address, id_blob, data->len)) {
> ret = -EFAULT;
> goto e_free;
> }
> @@ -727,6 +730,8 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
> struct sev_user_data_pdh_cert_export input;
> void *pdh_blob = NULL, *cert_blob = NULL;
> struct sev_data_pdh_cert_export *data;
> + void __user *input_cert_chain_address;
> + void __user *input_pdh_cert_address;
> int ret;
>
> /* If platform is not in INIT state then transition it to INIT. */
> @@ -752,16 +757,19 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
> !input.cert_chain_address)
> goto cmd;
>
> + input_pdh_cert_address = (void __user *)input.pdh_cert_address;
> + input_cert_chain_address = (void __user *)input.cert_chain_address;
> +
> /* Allocate a physically contiguous buffer to store the PDH blob. */
> if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
> - !access_ok(input.pdh_cert_address, input.pdh_cert_len)) {
> + !access_ok(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(input.cert_chain_address, input.cert_chain_len)) {
> + !access_ok(input_cert_chain_address, input.cert_chain_len)) {
> ret = -EFAULT;
> goto e_free;
> }
> @@ -797,7 +805,7 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
> }
>
> if (pdh_blob) {
> - if (copy_to_user((void __user *)input.pdh_cert_address,
> + if (copy_to_user(input_pdh_cert_address,
> pdh_blob, input.pdh_cert_len)) {
> ret = -EFAULT;
> goto e_free_cert;
> @@ -805,7 +813,7 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
> }
>
> if (cert_blob) {
> - if (copy_to_user((void __user *)input.cert_chain_address,
> + if (copy_to_user(input_cert_chain_address,
> cert_blob, input.cert_chain_len))
> ret = -EFAULT;
> }
> diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
> index 7fbc8679145c..49d155cd2dfe 100644
> --- a/include/linux/psp-sev.h
> +++ b/include/linux/psp-sev.h
> @@ -597,7 +597,7 @@ 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);
> +void *psp_copy_user_blob(u64 uaddr, u32 len);
>
> #else /* !CONFIG_CRYPTO_DEV_SP_PSP */
>
