* [PATCH v2] MdeModulePkg/UefiHiiLib: Fix incorrect check for string length
@ 2017-08-29 6:44 Dandan Bi
2017-08-29 7:25 ` Dong, Eric
0 siblings, 1 reply; 2+ messages in thread
From: Dandan Bi @ 2017-08-29 6:44 UTC (permalink / raw)
To: edk2-devel; +Cc: Eric Dong, Liming Gao
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=681
For string opcode,when checking the valid string length,
it should exclude the Null-terminated character.
And for string in NameValue storage, need to exclude
the varname and also need to convert the Config string
length to Unicode string length.
Cc: Eric Dong <eric.dong@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
MdeModulePkg/Library/UefiHiiLib/HiiLib.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/MdeModulePkg/Library/UefiHiiLib/HiiLib.c b/MdeModulePkg/Library/UefiHiiLib/HiiLib.c
index cd0cd35..5249392 100644
--- a/MdeModulePkg/Library/UefiHiiLib/HiiLib.c
+++ b/MdeModulePkg/Library/UefiHiiLib/HiiLib.c
@@ -1605,11 +1605,11 @@ ValidateQuestionFromVfr (
IfrString = (EFI_IFR_STRING *) IfrOpHdr;
if (IfrString->Question.VarStoreId != VarStoreData.VarStoreId) {
break;
}
//
- // Get Width by OneOf Flags
+ // Get the Max size of the string.
//
Width = (UINT16) (IfrString->MaxSize * sizeof (UINT16));
if (NameValueType) {
QuestionName = HiiGetString (HiiHandle, IfrString->Question.VarStoreInfo.VarName, NULL);
ASSERT (QuestionName != NULL);
@@ -1619,20 +1619,29 @@ ValidateQuestionFromVfr (
//
// This question is not in the current configuration string. Skip it.
//
break;
}
+ //
+ // Skip the VarName.
+ //
+ StringPtr += StrLen (QuestionName);
//
// Skip the "=".
//
StringPtr += 1;
//
// Check current string length is less than maxsize
+ // e.g Config String: "0041004200430044", Unicode String: "ABCD". Unicode String length = Config String length / 4.
+ // Config string format in UEFI spec.
+ // <NvConfig> ::= <Label>'='<String>
+ // <String> ::= [<Char>]+
+ // <Char> ::= <HexCh>4
//
- if (StrSize (StringPtr) > Width) {
+ if (StrLen (StringPtr) / 4 > IfrString->MaxSize) {
return EFI_INVALID_PARAMETER;
}
} else {
//
// Get Offset/Width by Question header and OneOf Flags
@@ -1658,11 +1667,11 @@ ValidateQuestionFromVfr (
}
//
// Check current string length is less than maxsize
//
- if (StrSize ((CHAR16 *) (VarBuffer + Offset)) > Width) {
+ if (StrLen ((CHAR16 *) (VarBuffer + Offset)) > IfrString->MaxSize) {
return EFI_INVALID_PARAMETER;
}
}
break;
case EFI_IFR_ONE_OF_OPTION_OP:
--
1.9.5.msysgit.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] MdeModulePkg/UefiHiiLib: Fix incorrect check for string length
2017-08-29 6:44 [PATCH v2] MdeModulePkg/UefiHiiLib: Fix incorrect check for string length Dandan Bi
@ 2017-08-29 7:25 ` Dong, Eric
0 siblings, 0 replies; 2+ messages in thread
From: Dong, Eric @ 2017-08-29 7:25 UTC (permalink / raw)
To: Bi, Dandan, edk2-devel@lists.01.org; +Cc: Gao, Liming
Reviewed-by: Eric Dong <eric.dong@intel.com>
-----Original Message-----
From: Bi, Dandan
Sent: Tuesday, August 29, 2017 2:45 PM
To: edk2-devel@lists.01.org
Cc: Dong, Eric <eric.dong@intel.com>; Gao, Liming <liming.gao@intel.com>
Subject: [PATCH v2] MdeModulePkg/UefiHiiLib: Fix incorrect check for string length
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=681
For string opcode,when checking the valid string length, it should exclude the Null-terminated character.
And for string in NameValue storage, need to exclude the varname and also need to convert the Config string length to Unicode string length.
Cc: Eric Dong <eric.dong@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
---
MdeModulePkg/Library/UefiHiiLib/HiiLib.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/MdeModulePkg/Library/UefiHiiLib/HiiLib.c b/MdeModulePkg/Library/UefiHiiLib/HiiLib.c
index cd0cd35..5249392 100644
--- a/MdeModulePkg/Library/UefiHiiLib/HiiLib.c
+++ b/MdeModulePkg/Library/UefiHiiLib/HiiLib.c
@@ -1605,11 +1605,11 @@ ValidateQuestionFromVfr (
IfrString = (EFI_IFR_STRING *) IfrOpHdr;
if (IfrString->Question.VarStoreId != VarStoreData.VarStoreId) {
break;
}
//
- // Get Width by OneOf Flags
+ // Get the Max size of the string.
//
Width = (UINT16) (IfrString->MaxSize * sizeof (UINT16));
if (NameValueType) {
QuestionName = HiiGetString (HiiHandle, IfrString->Question.VarStoreInfo.VarName, NULL);
ASSERT (QuestionName != NULL); @@ -1619,20 +1619,29 @@ ValidateQuestionFromVfr (
//
// This question is not in the current configuration string. Skip it.
//
break;
}
+ //
+ // Skip the VarName.
+ //
+ StringPtr += StrLen (QuestionName);
//
// Skip the "=".
//
StringPtr += 1;
//
// Check current string length is less than maxsize
+ // e.g Config String: "0041004200430044", Unicode String: "ABCD". Unicode String length = Config String length / 4.
+ // Config string format in UEFI spec.
+ // <NvConfig> ::= <Label>'='<String>
+ // <String> ::= [<Char>]+
+ // <Char> ::= <HexCh>4
//
- if (StrSize (StringPtr) > Width) {
+ if (StrLen (StringPtr) / 4 > IfrString->MaxSize) {
return EFI_INVALID_PARAMETER;
}
} else {
//
// Get Offset/Width by Question header and OneOf Flags @@ -1658,11 +1667,11 @@ ValidateQuestionFromVfr (
}
//
// Check current string length is less than maxsize
//
- if (StrSize ((CHAR16 *) (VarBuffer + Offset)) > Width) {
+ if (StrLen ((CHAR16 *) (VarBuffer + Offset)) >
+ IfrString->MaxSize) {
return EFI_INVALID_PARAMETER;
}
}
break;
case EFI_IFR_ONE_OF_OPTION_OP:
--
1.9.5.msysgit.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
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