From d6112ea0cb344d6f5ed519991e24f69ba4b43d0e Mon Sep 17 00:00:00 2001 From: "Singh, Brijesh" Date: Thu, 28 Mar 2019 21:58:52 +0000 Subject: crypto: ccp - introduce SEV_GET_ID2 command The current definition and implementation of the SEV_GET_ID command does not provide the length of the unique ID returned by the firmware. As per the firmware specification, the firmware may return an ID length that is not restricted to 64 bytes as assumed by the SEV_GET_ID command. Introduce the SEV_GET_ID2 command to overcome with the SEV_GET_ID limitations. Deprecate the SEV_GET_ID in the favor of SEV_GET_ID2. At the same time update SEV API web link. Cc: Janakarajan Natarajan Cc: Herbert Xu Cc: Gary Hook Cc: Tom Lendacky Cc: Nathaniel McCallum Signed-off-by: Brijesh Singh Signed-off-by: Herbert Xu --- drivers/crypto/ccp/psp-dev.c | 67 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) (limited to 'drivers/crypto/ccp') diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index fadf859a14b8..80a59be9c80d 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -583,6 +583,69 @@ e_free: return ret; } +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 *id_blob = NULL; + int ret; + + /* SEV GET_ID is available from SEV API v0.16 and up */ + if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16)) + return -ENOTSUPP; + + if (copy_from_user(&input, (void __user *)argp->data, sizeof(input))) + return -EFAULT; + + /* Check if we have write access to the userspace buffer */ + if (input.address && + input.length && + !access_ok(input.address, input.length)) + return -EFAULT; + + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + if (input.address && input.length) { + id_blob = kmalloc(input.length, GFP_KERNEL); + if (!id_blob) { + kfree(data); + return -ENOMEM; + } + + data->address = __psp_pa(id_blob); + data->len = input.length; + } + + ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error); + + /* + * Firmware will return the length of the ID value (either the minimum + * required length or the actual length written), return it to the user. + */ + input.length = data->len; + + if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) { + ret = -EFAULT; + goto e_free; + } + + if (id_blob) { + if (copy_to_user((void __user *)input.address, + id_blob, data->len)) { + ret = -EFAULT; + goto e_free; + } + } + +e_free: + kfree(id_blob); + kfree(data); + + return ret; +} + static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp) { struct sev_data_get_id *data; @@ -761,8 +824,12 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) ret = sev_ioctl_do_pdh_export(&input); break; case SEV_GET_ID: + pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n"); ret = sev_ioctl_do_get_id(&input); break; + case SEV_GET_ID2: + ret = sev_ioctl_do_get_id2(&input); + break; default: ret = -EINVAL; goto out; -- cgit v1.2.3