diff options
Diffstat (limited to 'drivers/s390/char/uvdevice.c')
-rw-r--r-- | drivers/s390/char/uvdevice.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/s390/char/uvdevice.c b/drivers/s390/char/uvdevice.c index 7221e987703a..70502c4ec290 100644 --- a/drivers/s390/char/uvdevice.c +++ b/drivers/s390/char/uvdevice.c @@ -38,6 +38,7 @@ static const u32 ioctl_nr_to_uvc_bit[] __initconst = { [UVIO_IOCTL_UVDEV_INFO_NR] = BIT_UVIO_INTERNAL, [UVIO_IOCTL_ATT_NR] = BIT_UVC_CMD_RETR_ATTEST, [UVIO_IOCTL_ADD_SECRET_NR] = BIT_UVC_CMD_ADD_SECRET, + [UVIO_IOCTL_LIST_SECRETS_NR] = BIT_UVC_CMD_LIST_SECRETS, }; static_assert(ARRAY_SIZE(ioctl_nr_to_uvc_bit) == UVIO_IOCTL_NUM_IOCTLS); @@ -291,6 +292,54 @@ out: return ret; } +/** uvio_list_secrets() - perform a List Secret UVC + * @uv_ioctl: ioctl control block + * + * uvio_list_secrets() performs the List Secret Ultravisor Call. It verifies + * that the given userspace argument address is valid and its size is sane. + * Every other check is made by the Ultravisor (UV) and won't result in a + * negative return value. It builds the request, performs the UV-call, and + * copies the result to userspace. + * + * The argument specifies the location for the result of the UV-Call. + * + * If the List Secrets UV facility is not present, UV will return invalid + * command rc. This won't be fenced in the driver and does not result in a + * negative return value. + * + * Context: might sleep + * + * Return: 0 on success or a negative error code on error. + */ +static int uvio_list_secrets(struct uvio_ioctl_cb *uv_ioctl) +{ + void __user *user_buf_arg = (void __user *)uv_ioctl->argument_addr; + struct uv_cb_guest_addr uvcb = { + .header.len = sizeof(uvcb), + .header.cmd = UVC_CMD_LIST_SECRETS, + }; + void *secrets = NULL; + int ret = 0; + + if (uv_ioctl->argument_len != UVIO_LIST_SECRETS_LEN) + return -EINVAL; + + secrets = kvzalloc(UVIO_LIST_SECRETS_LEN, GFP_KERNEL); + if (!secrets) + return -ENOMEM; + + uvcb.addr = (u64)secrets; + uv_call_sched(0, (u64)&uvcb); + uv_ioctl->uv_rc = uvcb.header.rc; + uv_ioctl->uv_rrc = uvcb.header.rrc; + + if (copy_to_user(user_buf_arg, secrets, UVIO_LIST_SECRETS_LEN)) + ret = -EFAULT; + + kvfree(secrets); + return ret; +} + static int uvio_copy_and_check_ioctl(struct uvio_ioctl_cb *ioctl, void __user *argp, unsigned long cmd) { @@ -338,6 +387,9 @@ static long uvio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) case UVIO_IOCTL_ADD_SECRET_NR: ret = uvio_add_secret(&uv_ioctl); break; + case UVIO_IOCTL_LIST_SECRETS_NR: + ret = uvio_list_secrets(&uv_ioctl); + break; default: ret = -ENOIOCTLCMD; break; |