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* [PATCH v2] SecurityPkg/SecureBootConfigDxe: Handle lack of STR_SIGNATURE_* tokens
@ 2017-10-18  8:05 chenc2
  2017-10-18  8:06 ` Wu, Hao A
  2017-10-19  4:30 ` Zhang, Chao B
  0 siblings, 2 replies; 3+ messages in thread
From: chenc2 @ 2017-10-18  8:05 UTC (permalink / raw)
  To: edk2-devel; +Cc: chenc2, Zhang Chao, Wu Hao

Add check to avoid NULL ptr dereference. The function HiiGetString
will return NULL pointer when the platform does not install the
appropriate string or call HiiGetString fail.(For example, HII not
support specified language.)

Cc: Zhang Chao <chao.b.zhang@intel.com>
Cc: Wu Hao <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: chenc2 <chen.a.chen@intel.com>
---
 .../SecureBootConfigDxe/SecureBootConfigImpl.c     | 113 ++++++++++++++-------
 1 file changed, 76 insertions(+), 37 deletions(-)

diff --git a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c
index acb0dc0558..d035763106 100644
--- a/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c
+++ b/SecurityPkg/VariableAuthenticated/SecureBootConfigDxe/SecureBootConfigImpl.c
@@ -3572,6 +3572,9 @@ LoadSignatureList (
 {
   EFI_STATUS            Status;
   EFI_STRING_ID         ListType;
+  EFI_STRING            FormatNameString;
+  EFI_STRING            FormatHelpString;
+  EFI_STRING            FormatTypeString;
   EFI_SIGNATURE_LIST    *ListWalker;
   EFI_IFR_GUID_LABEL    *StartLabel;
   EFI_IFR_GUID_LABEL    *EndLabel;
@@ -3591,6 +3594,8 @@ LoadSignatureList (
   CHAR16                HelpBuffer[BUFFER_MAX_SIZE];
 
   Status                = EFI_SUCCESS;
+  FormatNameString      = NULL;
+  FormatHelpString      = NULL;
   StartOpCodeHandle     = NULL;
   EndOpCodeHandle       = NULL;
   StartGotoHandle       = NULL;
@@ -3705,6 +3710,12 @@ LoadSignatureList (
     goto ON_EXIT;
   }
 
+  FormatNameString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_NAME_FORMAT), NULL);
+  FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_HELP_FORMAT), NULL);
+  if (FormatNameString == NULL || FormatHelpString == NULL) {
+    goto ON_EXIT;
+  }
+
   RemainingSize = DataSize;
   ListWalker    = (EFI_SIGNATURE_LIST *)VariableData;
   while ((RemainingSize > 0) && (RemainingSize >= ListWalker->SignatureListSize)) {
@@ -3725,21 +3736,23 @@ LoadSignatureList (
     } else {
       ListType = STRING_TOKEN (STR_LIST_TYPE_UNKNOWN);
     }
+    FormatTypeString = HiiGetString (PrivateData->HiiHandle, ListType, NULL);
+    if (FormatTypeString == NULL) {
+      goto ON_EXIT;
+    }
 
     ZeroMem (NameBuffer, sizeof (NameBuffer));
-    UnicodeSPrint (NameBuffer,
-      sizeof (NameBuffer),
-      HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_NAME_FORMAT), NULL),
-      Index + 1
-    );
+    UnicodeSPrint (NameBuffer, sizeof (NameBuffer), FormatNameString, Index + 1);
 
     ZeroMem (HelpBuffer, sizeof (HelpBuffer));
     UnicodeSPrint (HelpBuffer,
       sizeof (HelpBuffer),
-      HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_LIST_HELP_FORMAT), NULL),
-      HiiGetString (PrivateData->HiiHandle, ListType, NULL),
+      FormatHelpString,
+      FormatTypeString,
       SIGNATURE_DATA_COUNTS (ListWalker)
     );
+    SECUREBOOT_FREE_NON_NULL (FormatTypeString);
+    FormatTypeString = NULL;
 
     HiiCreateGotoOpCode (
       StartOpCodeHandle,
@@ -3777,6 +3790,8 @@ ON_EXIT:
   SECUREBOOT_FREE_NON_OPCODE (EndGotoHandle);
 
   SECUREBOOT_FREE_NON_NULL (VariableData);
+  SECUREBOOT_FREE_NON_NULL (FormatNameString);
+  SECUREBOOT_FREE_NON_NULL (FormatHelpString);
 
   PrivateData->ListCount = Index;
 
@@ -3922,6 +3937,8 @@ FormatHelpInfo (
   EFI_STATUS      Status;
   EFI_TIME        *Time;
   EFI_STRING_ID   ListTypeId;
+  EFI_STRING      FormatHelpString;
+  EFI_STRING      FormatTypeString;
   UINTN           DataSize;
   UINTN           HelpInfoIndex;
   UINTN           TotalSize;
@@ -3931,12 +3948,13 @@ FormatHelpInfo (
   CHAR16          *HelpInfoString;
   BOOLEAN         IsCert;
 
-  Status          = EFI_SUCCESS;
-  Time            = NULL;
-  HelpInfoIndex   = 0;
-  DataString      = NULL;
-  HelpInfoString  = NULL;
-  IsCert          = FALSE;
+  Status            = EFI_SUCCESS;
+  Time              = NULL;
+  FormatTypeString  = NULL;
+  HelpInfoIndex     = 0;
+  DataString        = NULL;
+  HelpInfoString    = NULL;
+  IsCert            = FALSE;
 
   if (CompareGuid(&ListEntry->SignatureType, &gEfiCertRsa2048Guid)) {
     ListTypeId = STRING_TOKEN(STR_LIST_TYPE_RSA2048_SHA256);
@@ -3969,6 +3987,11 @@ FormatHelpInfo (
     goto ON_EXIT;
   }
 
+  FormatTypeString = HiiGetString (PrivateData->HiiHandle, ListTypeId, NULL);
+  if (FormatTypeString == NULL) {
+    goto ON_EXIT;
+  }
+
   TotalSize = 1024;
   HelpInfoString = AllocateZeroPool (TotalSize);
   if (HelpInfoString == NULL) {
@@ -3981,40 +4004,45 @@ FormatHelpInfo (
   //
   ZeroMem (GuidString, sizeof (GuidString));
   GuidToString(&DataEntry->SignatureOwner, GuidString, BUFFER_MAX_SIZE);
+  FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_GUID), NULL);
+  if (FormatHelpString == NULL) {
+    goto ON_EXIT;
+  }
   HelpInfoIndex += UnicodeSPrint (
                      &HelpInfoString[HelpInfoIndex],
                      TotalSize - sizeof(CHAR16) * HelpInfoIndex,
-                     HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_GUID), NULL),
+                     FormatHelpString,
                      GuidString
                    );
+  SECUREBOOT_FREE_NON_NULL (FormatHelpString);
+  FormatHelpString = NULL;
 
   //
   // Format content part, it depends on the type of signature list, hash value or CN.
   //
   if (IsCert) {
     GetCommonNameFromX509 (ListEntry, DataEntry, &DataString);
-    HelpInfoIndex += UnicodeSPrint(
-                       &HelpInfoString[HelpInfoIndex],
-                       TotalSize - sizeof(CHAR16) * HelpInfoIndex,
-                       HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_CN), NULL),
-                       HiiGetString (PrivateData->HiiHandle, ListTypeId, NULL),
-                       DataSize,
-                       DataString
-                     );
+    FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_CN), NULL);
   } else {
     //
     //  Format hash value for each signature data entry.
     //
     ParseHashValue (ListEntry, DataEntry, &DataString);
-    HelpInfoIndex += UnicodeSPrint (
-                       &HelpInfoString[HelpInfoIndex],
-                       TotalSize - sizeof(CHAR16) * HelpInfoIndex,
-                       HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_HASH), NULL),
-                       HiiGetString (PrivateData->HiiHandle, ListTypeId, NULL),
-                       DataSize,
-                       DataString
-                     );
+    FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_HASH), NULL);
+  }
+  if (FormatHelpString == NULL) {
+    goto ON_EXIT;
   }
+  HelpInfoIndex += UnicodeSPrint (
+                     &HelpInfoString[HelpInfoIndex],
+                     TotalSize - sizeof (CHAR16) * HelpInfoIndex,
+                     FormatHelpString,
+                     FormatTypeString,
+                     DataSize,
+                     DataString
+                   );
+  SECUREBOOT_FREE_NON_NULL (FormatHelpString);
+  FormatHelpString = NULL;
 
   //
   // Format revocation time part.
@@ -4032,13 +4060,18 @@ FormatHelpInfo (
       Time->Minute,
       Time->Second
     );
-
+    FormatHelpString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_TIME), NULL);
+    if (FormatHelpString == NULL) {
+      goto ON_EXIT;
+    }
     UnicodeSPrint (
       &HelpInfoString[HelpInfoIndex],
       TotalSize - sizeof (CHAR16) * HelpInfoIndex,
-      HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_HELP_FORMAT_TIME), NULL),
+      FormatHelpString,
       TimeString
     );
+    SECUREBOOT_FREE_NON_NULL (FormatHelpString);
+    FormatHelpString = NULL;
   }
 
   *StringId = HiiSetString (PrivateData->HiiHandle, 0, HelpInfoString, NULL);
@@ -4046,6 +4079,8 @@ ON_EXIT:
   SECUREBOOT_FREE_NON_NULL (DataString);
   SECUREBOOT_FREE_NON_NULL (HelpInfoString);
 
+  SECUREBOOT_FREE_NON_NULL (FormatTypeString);
+
   return Status;
 }
 
@@ -4076,6 +4111,7 @@ LoadSignatureData (
   EFI_IFR_GUID_LABEL    *StartLabel;
   EFI_IFR_GUID_LABEL    *EndLabel;
   EFI_STRING_ID         HelpStringId;
+  EFI_STRING            FormatNameString;
   VOID                  *StartOpCodeHandle;
   VOID                  *EndOpCodeHandle;
   UINTN                 DataSize;
@@ -4086,6 +4122,7 @@ LoadSignatureData (
   CHAR16                NameBuffer[BUFFER_MAX_SIZE];
 
   Status              = EFI_SUCCESS;
+  FormatNameString    = NULL;
   StartOpCodeHandle   = NULL;
   EndOpCodeHandle     = NULL;
   Index               = 0;
@@ -4167,17 +4204,18 @@ LoadSignatureData (
     ListWalker = (EFI_SIGNATURE_LIST *)((UINT8 *)ListWalker + ListWalker->SignatureListSize);
   }
 
+  FormatNameString = HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_NAME_FORMAT), NULL);
+  if (FormatNameString == NULL) {
+    goto ON_EXIT;
+  }
+
   DataWalker = (EFI_SIGNATURE_DATA *)((UINT8 *)ListWalker + sizeof(EFI_SIGNATURE_LIST) + ListWalker->SignatureHeaderSize);
   for (Index = 0; Index < SIGNATURE_DATA_COUNTS(ListWalker); Index = Index + 1) {
     //
     // Format name buffer.
     //
     ZeroMem (NameBuffer, sizeof (NameBuffer));
-    UnicodeSPrint (NameBuffer,
-      sizeof (NameBuffer),
-      HiiGetString (PrivateData->HiiHandle, STRING_TOKEN (STR_SIGNATURE_DATA_NAME_FORMAT), NULL),
-      Index + 1
-    );
+    UnicodeSPrint (NameBuffer, sizeof (NameBuffer), FormatNameString, Index + 1);
 
     //
     // Format help info buffer.
@@ -4221,6 +4259,7 @@ ON_EXIT:
   SECUREBOOT_FREE_NON_OPCODE (EndOpCodeHandle);
 
   SECUREBOOT_FREE_NON_NULL (VariableData);
+  SECUREBOOT_FREE_NON_NULL (FormatNameString);
 
   return Status;
 }
-- 
2.13.2.windows.1



^ permalink raw reply related	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2017-10-19  4:26 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2017-10-18  8:05 [PATCH v2] SecurityPkg/SecureBootConfigDxe: Handle lack of STR_SIGNATURE_* tokens chenc2
2017-10-18  8:06 ` Wu, Hao A
2017-10-19  4:30 ` Zhang, Chao B

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