[edk2-devel] [PATCH v2 1/2] MdePkg/BaseLib: Fix unaligned API prototypes
Andrew Fish via groups.io
afish=apple.com at groups.io
Tue Aug 10 17:36:34 UTC 2021
> On Aug 10, 2021, at 1:53 AM, Marvin Häuser <mhaeuser at posteo.de> wrote:
>
> On 09/08/2021 23:32, Andrew Fish via groups.io <http://groups.io/> wrote:
>>
>>
>>> On Aug 9, 2021, at 9:15 AM, Michael D Kinney <michael.d.kinney at intel.com <mailto:michael.d.kinney at intel.com> <mailto:michael.d.kinney at intel.com <mailto:michael.d.kinney at intel.com>>> wrote:
>>>
>>> Hi Marvin,
>>>
>>> Can you provide an example of which C compiler is flagging this as
>>> an error and what error message is generated.
>>>
>>> Please enter a BZ with this background information and add link to the
>>> BZ in the commit message.
>>>
>>> This is a change to the BaseLib class, so we need to make sure there
>>> are no impacts to any existing code. I looks like a safe change
>>> because changing from a pointer to a fixed size type to VOID *
>>> should be compatible. Please add that analysis to the background
>>> in the BZ as well.
>>>
>>
>> MIke,
>>
>> I want to say we had a discussion about this years ago? I don’t remember the outcome.
>>
>> Dereferencing a misaligned pointer is UB (Undefined Behavior) in C [1], but historically x86 compilers have let it slide.
>>
>> I think the situation we are in is the BaseLib functions don’t contain UB, but it is UB for the caller to use the returned pointer directly.
>
> They do contain UB, inherently from the combination of their prototype and their usage.
> Please refer to the new BZ added for V2: https://bugzilla.tianocore.org/show_bug.cgi?id=3542 <https://bugzilla.tianocore.org/show_bug.cgi?id=3542>
>
I think we are saying the same thing. My point is it is possible to use the library API correctly, but likely no one does. Changing the API to a VOID also does not fix every issue, actually it is a drop in to existing code so it does not really force any fixes...
> I could only speculate why UBsan does not check cast safety...
> To be fair, I don't know a real-world platform that has issues with this UB, but the fix is simple enough in my opinion.
>
Cast is compile time UB, not runtime. UBSan is doing runtime checks. You can catch compile time UB with warnings. I've have had way too many talks with the clang folks about UB and firmware :).
> Actually, enabling "-Wcast-align" some day would be great either way. :)
>
In my example this gets you past the -Wcast-align. We have the same type of casts for the size of pointers and casting through UINTN.
UINT16 *pointer = (UINT16 *)(void *)(buffer+1);
Actually I’m starting to remember why we chose not to fix this before. It does not really help…. Notice if we change the API to use `VOID *` vs. `UINT16 *` nothing really changed [1] ? It is still up to the caller to do the right thing. The real issue is the functions are not really useful given strict UB in C….
A better solution is to just tell the compiler this pointer is not aligned, and at that point you DON'T need the lib functions….
This code passes -Wcast-align and -fsanitize=undefined runtime checks:
typedef UINT16 UUINT16 __attribute__ ((aligned (1)));
int main()
{
UINT8 *buffer = malloc(64);
UUINT16 *pointer = (UUINT16 *)(buffer+1);
*pointer = 42;
return *pointer;
}
So a better solution maybe to defined unaligned basic types? I’m not sure if __declspec(align(1)) does the right thing for VC++, __attribute__ ((aligned (1))); does the right thing for GCC and clang. Assuming this works we could defined unaligned version of our basic types, and over time obsolete the current alignment lib functions. We could start with a warning comment to use the unaligned types vs. current library functions.
I’m thinking for the types in ProcessorBind.h[2] and Base.h[3] we could have a byte aligned versions. For example given UINT16 we add UUINT16 to Base.h. I guess we could also look into a #define abstraction for ` __attribute__ ((aligned (1)))` so new could could use that in a portable way?
Just to be clear if we define UUINT16 then the compiler will do the the work of WriteUnaligned16() in the code generation, if it is needed by the CPU arch. Given that it is much harder for the coder to “mess it up”.
Actually I changed my mind I think we will want to keep the Unaligned library functions, but update them to use the unaligned pointers. The reason we need the function is the compiler is generating code that follow the rules of the CPU, so we need the library functions to talk to hardware devices that have stricter alignment rules than the CPU. For example on x86 UUINT16 will end up being a word operation in assembler. This is the reason the current lib functions use volatile. Sorry figuring this out as I type. So looks like we need to add unaligned types and update the libs to use those types? For memory operations you can use the new unaligned types, and for hardware access use the lib functions.
[1] ~/work/Compiler>cat ub.c
#include <stdlib.h>
#define EFIAPI
#define IN
#define OUT
#define VOID void
typedef unsigned char UINT8;
typedef unsigned short UINT16;
UINT16
EFIAPI
WriteUnaligned16 (
OUT VOID *Buffer,
IN UINT16 Value
)
{
// ASSERT (Buffer != NULL);
((volatile UINT8*)Buffer)[0] = (UINT8)Value;
((volatile UINT8*)Buffer)[1] = (UINT8)(Value >> 8);
return Value;
}
int main()
{
UINT8 *buffer = malloc(64);
UINT16 *pointer = (UINT16 *)(void *)(buffer+1);
WriteUnaligned16 (pointer, 42);
// *pointer = 42; // Error: misaligned integer pointer assignment
return *pointer;
}
~/work/Compiler>clang -fsanitize=undefined -Wcast-align ub.c
~/work/Compiler>./a.out
ub.c:35:9: runtime error: load of misaligned address 0x7fdd9d405aa1 for type 'UINT16' (aka 'unsigned short'), which requires 2 byte alignment
0x7fdd9d405aa1: note: pointer points here
00 00 00 64 2a 00 79 6d 28 52 54 4c 44 5f 44 45 46 41 55 4c 54 2c 20 73 77 69 66 74 5f 64 65 6d
^
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ub.c:35:9 in
~/work/Compiler>
[2] https://github.com/tianocore/edk2/blob/master/MdePkg/Include/X64/ProcessorBind.h#L127
[3] https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Base.h
Thanks,
Andrew Fish
> Best regards,
> Marvin
>
>>
>> Here is a simple example with clang UndefinedBehaviorSanitizer (UBSan) .
>>
>> ~/work/Compiler>cat ub.c
>> #include <stdlib.h>
>>
>> #define EFIAPI
>> #define IN
>> #define OUT
>>
>> typedef unsigned char UINT8;
>> typedef unsigned short UINT16;
>>
>> UINT16
>> EFIAPI
>> WriteUnaligned16 (
>> OUT UINT16 *Buffer,
>> IN UINT16 Value
>> )
>> {
>> // ASSERT (Buffer != NULL);
>>
>> ((volatile UINT8*)Buffer)[0] = (UINT8)Value;
>> ((volatile UINT8*)Buffer)[1] = (UINT8)(Value >> 8);
>>
>> return Value;
>> }
>>
>>
>> int main()
>> {
>> UINT8 *buffer = malloc(64);
>> UINT16 *pointer = (UINT16 *)(buffer + 1);
>>
>>
>> WriteUnaligned16 (pointer, 42);
>>
>>
>> // *pointer = 42; // Error: misaligned integer pointer assignment
>> return *pointer;
>> }
>> ~/work/Compiler>clang -fsanitize=undefined ub.c
>> ~/work/Compiler>./a.out
>> *ub.c:34:9:**runtime error: **load of misaligned address 0x7feac6405aa1 for type 'UINT16' (aka 'unsigned short'), which requires 2 byte alignment*
>> *0x7feac6405aa1: note: *pointer points here
>> 00 00 00 64 2a 00 79 6d 28 52 54 4c 44 5f 44 45 46 41 55 4c 54 2c 20 73 77 69 66 74 5f 64 65 6d
>> * ^ *
>> SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior ub.c:34:9 in
>>
>> FYI line 39 is `return *pointer`and 42 is 0x2A. So reading an writing to *pointer is UB.
>>
>>
>> As you can see in [1] the general advice is to take code that looks like:
>> int8_t *buffer = malloc(64);int32_t *pointer = (int32_t *)(buffer + 1);*pointer = 42; // Error: misaligned integer pointer assignment
>> And replace it with;
>> int8_t *buffer = malloc(64);int32_t value = 42;memcpy(buffer + 1, &value, sizeof(int32_t)); // Correct
>>
>> But in these cases the result is in a byte aligned buffer….
>>
>> [1] https://developer.apple.com/documentation/xcode/misaligned-pointer <https://developer.apple.com/documentation/xcode/misaligned-pointer> <https://developer.apple.com/documentation/xcode/misaligned-pointer <https://developer.apple.com/documentation/xcode/misaligned-pointer>>
>>
>> Thanks,
>>
>> Andrew Fish
>>
>>> Thanks,
>>>
>>> Mike
>>>
>>>
>>>> -----Original Message-----
>>>> From: Marvin Häuser <mhaeuser at posteo.de <mailto:mhaeuser at posteo.de> <mailto:mhaeuser at posteo.de <mailto:mhaeuser at posteo.de>>>
>>>> Sent: Monday, August 9, 2021 2:51 AM
>>>> To:devel at edk2.groups.io <mailto:devel at edk2.groups.io> <mailto:devel at edk2.groups.io <mailto:devel at edk2.groups.io>>
>>>> Cc: Kinney, Michael D <michael.d.kinney at intel.com <mailto:michael.d.kinney at intel.com> <mailto:michael.d.kinney at intel.com <mailto:michael.d.kinney at intel.com>>>; Liming Gao <gaoliming at byosoft.com.cn <mailto:gaoliming at byosoft.com.cn> <mailto:gaoliming at byosoft.com.cn <mailto:gaoliming at byosoft.com.cn>>>; Liu, Zhiguang
>>>> <zhiguang.liu at intel.com <mailto:zhiguang.liu at intel.com> <mailto:zhiguang.liu at intel.com <mailto:zhiguang.liu at intel.com>>>; Vitaly Cheptsov <vit9696 at protonmail.com <mailto:vit9696 at protonmail.com> <mailto:vit9696 at protonmail.com <mailto:vit9696 at protonmail.com>>>
>>>> Subject: [PATCH v2 1/2] MdePkg/BaseLib: Fix unaligned API prototypes
>>>>
>>>> C prohibits not only dereferencing but also casting to unaligned
>>>> pointers. Thus, the current set of unaligned APIs cannot be called
>>>> safely. Update their prototypes to take VOID * pointers, which must
>>>> be able to represent any valid pointer.
>>>>
>>>> Cc: Michael D Kinney <michael.d.kinney at intel.com <mailto:michael.d.kinney at intel.com> <mailto:michael.d.kinney at intel.com <mailto:michael.d.kinney at intel.com>>>
>>>> Cc: Liming Gao <gaoliming at byosoft.com.cn <mailto:gaoliming at byosoft.com.cn> <mailto:gaoliming at byosoft.com.cn <mailto:gaoliming at byosoft.com.cn>>>
>>>> Cc: Zhiguang Liu <zhiguang.liu at intel.com <mailto:zhiguang.liu at intel.com> <mailto:zhiguang.liu at intel.com <mailto:zhiguang.liu at intel.com>>>
>>>> Cc: Vitaly Cheptsov <vit9696 at protonmail.com <mailto:vit9696 at protonmail.com> <mailto:vit9696 at protonmail.com <mailto:vit9696 at protonmail.com>>>
>>>> Signed-off-by: Marvin Häuser <mhaeuser at posteo.de <mailto:mhaeuser at posteo.de> <mailto:mhaeuser at posteo.de <mailto:mhaeuser at posteo.de>>>
>>>> ---
>>>> MdePkg/Library/BaseLib/Arm/Unaligned.c | 14 ++++-----
>>>> MdePkg/Library/BaseLib/Unaligned.c | 32 ++++++++++----------
>>>> MdePkg/Include/Library/BaseLib.h | 16 +++++-----
>>>> 3 files changed, 31 insertions(+), 31 deletions(-)
>>>>
>>>> diff --git a/MdePkg/Library/BaseLib/Arm/Unaligned.c b/MdePkg/Library/BaseLib/Arm/Unaligned.c
>>>> index e9934e7003cb..57f19fc44e0b 100644
>>>> --- a/MdePkg/Library/BaseLib/Arm/Unaligned.c
>>>> +++ b/MdePkg/Library/BaseLib/Arm/Unaligned.c
>>>> @@ -59,7 +59,7 @@ ReadUnaligned16 (
>>>> UINT16
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned16 (
>>>>
>>>> - OUT UINT16 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT16 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> @@ -87,7 +87,7 @@ WriteUnaligned16 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned24 (
>>>>
>>>> - IN CONST UINT32 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>> @@ -116,7 +116,7 @@ ReadUnaligned24 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned24 (
>>>>
>>>> - OUT UINT32 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT32 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> @@ -143,7 +143,7 @@ WriteUnaligned24 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned32 (
>>>>
>>>> - IN CONST UINT32 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> UINT16 LowerBytes;
>>>>
>>>> @@ -175,7 +175,7 @@ ReadUnaligned32 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned32 (
>>>>
>>>> - OUT UINT32 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT32 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> @@ -202,7 +202,7 @@ WriteUnaligned32 (
>>>> UINT64
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned64 (
>>>>
>>>> - IN CONST UINT64 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> UINT32 LowerBytes;
>>>>
>>>> @@ -234,7 +234,7 @@ ReadUnaligned64 (
>>>> UINT64
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned64 (
>>>>
>>>> - OUT UINT64 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT64 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> diff --git a/MdePkg/Library/BaseLib/Unaligned.c b/MdePkg/Library/BaseLib/Unaligned.c
>>>> index a419cb85e53c..3041adcde606 100644
>>>> --- a/MdePkg/Library/BaseLib/Unaligned.c
>>>> +++ b/MdePkg/Library/BaseLib/Unaligned.c
>>>> @@ -26,12 +26,12 @@
>>>> UINT16
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned16 (
>>>>
>>>> - IN CONST UINT16 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer;
>>>>
>>>> + return *(CONST UINT16 *) Buffer;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> /**
>>>>
>>>> @@ -52,13 +52,13 @@ ReadUnaligned16 (
>>>> UINT16
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned16 (
>>>>
>>>> - OUT UINT16 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT16 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer = Value;
>>>>
>>>> + return *(UINT16 *) Buffer = Value;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> /**
>>>>
>>>> @@ -77,12 +77,12 @@ WriteUnaligned16 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned24 (
>>>>
>>>> - IN CONST UINT32 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer & 0xffffff;
>>>>
>>>> + return *(CONST UINT32 *) Buffer & 0xffffff;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> /**
>>>>
>>>> @@ -103,13 +103,13 @@ ReadUnaligned24 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned24 (
>>>>
>>>> - OUT UINT32 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT32 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - *Buffer = BitFieldWrite32 (*Buffer, 0, 23, Value);
>>>>
>>>> + *(UINT32 *) Buffer = BitFieldWrite32 (*(CONST UINT32 *) Buffer, 0, 23, Value);
>>>>
>>>> return Value;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> @@ -129,12 +129,12 @@ WriteUnaligned24 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned32 (
>>>>
>>>> - IN CONST UINT32 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer;
>>>>
>>>> + return *(CONST UINT32 *) Buffer;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> /**
>>>>
>>>> @@ -155,13 +155,13 @@ ReadUnaligned32 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned32 (
>>>>
>>>> - OUT UINT32 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT32 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer = Value;
>>>>
>>>> + return *(UINT32 *) Buffer = Value;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> /**
>>>>
>>>> @@ -180,12 +180,12 @@ WriteUnaligned32 (
>>>> UINT64
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned64 (
>>>>
>>>> - IN CONST UINT64 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer;
>>>>
>>>> + return *(CONST UINT64 *) Buffer;
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> /**
>>>>
>>>> @@ -206,11 +206,11 @@ ReadUnaligned64 (
>>>> UINT64
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned64 (
>>>>
>>>> - OUT UINT64 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT64 Value
>>>>
>>>> )
>>>>
>>>> {
>>>>
>>>> ASSERT (Buffer != NULL);
>>>>
>>>>
>>>>
>>>> - return *Buffer = Value;
>>>>
>>>> + return *(UINT64 *) Buffer = Value;
>>>>
>>>> }
>>>>
>>>> diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
>>>> index 2452c1d92e51..4d30f0539c6b 100644
>>>> --- a/MdePkg/Include/Library/BaseLib.h
>>>> +++ b/MdePkg/Include/Library/BaseLib.h
>>>> @@ -3420,7 +3420,7 @@ DivS64x64Remainder (
>>>> UINT16
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned16 (
>>>>
>>>> - IN CONST UINT16 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> @@ -3442,7 +3442,7 @@ ReadUnaligned16 (
>>>> UINT16
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned16 (
>>>>
>>>> - OUT UINT16 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT16 Value
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>> @@ -3463,7 +3463,7 @@ WriteUnaligned16 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned24 (
>>>>
>>>> - IN CONST UINT32 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> @@ -3485,7 +3485,7 @@ ReadUnaligned24 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned24 (
>>>>
>>>> - OUT UINT32 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT32 Value
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>> @@ -3506,7 +3506,7 @@ WriteUnaligned24 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned32 (
>>>>
>>>> - IN CONST UINT32 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> @@ -3528,7 +3528,7 @@ ReadUnaligned32 (
>>>> UINT32
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned32 (
>>>>
>>>> - OUT UINT32 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT32 Value
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>> @@ -3549,7 +3549,7 @@ WriteUnaligned32 (
>>>> UINT64
>>>>
>>>> EFIAPI
>>>>
>>>> ReadUnaligned64 (
>>>>
>>>> - IN CONST UINT64 *Buffer
>>>>
>>>> + IN CONST VOID *Buffer
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> @@ -3571,7 +3571,7 @@ ReadUnaligned64 (
>>>> UINT64
>>>>
>>>> EFIAPI
>>>>
>>>> WriteUnaligned64 (
>>>>
>>>> - OUT UINT64 *Buffer,
>>>>
>>>> + OUT VOID *Buffer,
>>>>
>>>> IN UINT64 Value
>>>>
>>>> );
>>>>
>>>>
>>>>
>>>> --
>>>> 2.31.1
>>>
>>>
>>>
>>
>>
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