Rigorously check the TPL level and the event type.
Signed-off-by: Heinrich Schuchardt <[email protected]>
---
lib/efi_loader/efi_boottime.c | 35 ++++++++++++++++++++++++++++++++---
1 file changed, 32 insertions(+), 3 deletions(-)
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 298e6c3bbb..396f28c570 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -192,6 +192,25 @@ static void efi_queue_event(struct efi_event *event, bool
check_tpl)
event->is_queued = false;
}
+/**
+ * is_valid_tpl - check if the task priority level is valid
+ *
+ * @tpl: TPL level to check
+ * ReturnValue: status code
+ */
+efi_status_t is_valid_tpl(efi_uintn_t tpl)
+{
+ switch (tpl) {
+ case TPL_APPLICATION:
+ case TPL_CALLBACK:
+ case TPL_NOTIFY:
+ case TPL_HIGH_LEVEL:
+ return EFI_SUCCESS;
+ default:
+ return EFI_INVALID_PARAMETER;
+ }
+}
+
/**
* efi_signal_event - signal an EFI event
*
@@ -591,11 +610,21 @@ efi_status_t efi_create_event(uint32_t type, efi_uintn_t
notify_tpl,
if (event == NULL)
return EFI_INVALID_PARAMETER;
- if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
+ switch (type) {
+ case 0:
+ case EVT_TIMER:
+ case EVT_NOTIFY_SIGNAL:
+ case EVT_TIMER | EVT_NOTIFY_SIGNAL:
+ case EVT_NOTIFY_WAIT:
+ case EVT_TIMER | EVT_NOTIFY_WAIT:
+ case EVT_SIGNAL_EXIT_BOOT_SERVICES:
+ case EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE:
+ break;
+ default:
return EFI_INVALID_PARAMETER;
+ }
- if ((type & (EVT_NOTIFY_SIGNAL | EVT_NOTIFY_WAIT)) &&
- notify_function == NULL)
+ if (is_valid_tpl(notify_tpl) != EFI_SUCCESS)
return EFI_INVALID_PARAMETER;
evt = calloc(1, sizeof(struct efi_event));
--
2.18.0
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