MdeModulePkg/Library: Fix memory leak for ArmFfaLib's Rx/Tx buffer and add ArmFfaLib for PeilessSec #11166

LeviYeoReum · 2025-06-06T14:33:50Z

Description

This patchset adds:
- Fix memory leak on Rx/Tx buffer in ArmFfaPeiLib.
- Add ArmFfaSecLib for PeilessSec.

Patch 1 fixes the memory leak on RxTx buffer when ArmFfaPeiLib used.
Patch 2 makes PcdFixedAtBuildPcd as PcdsFixedAtBuildPCD.
Patch 3 adds ArmFfaSecLib used in PeilessSec
Patch 4 cleanup duplication code on ArmFfaLib.
Patch 5 change type of buffer address in ArmFFaRxTxBufferInfo structure.

Signed-off-by: Yeoreum Yun [email protected]

LeviYeoReum · 2025-06-19T14:28:25Z

@kuqin12, @samimujawar
Could you review this please?

Thanks!

MdeModulePkg/Library/ArmFfaLib/ArmFfaPeiLib.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaRxTxMap.c

LeviYeoReum · 2025-06-26T14:09:03Z

@kuqin12 @samimujawar
Gentle ping in case of forgotten.

kuqin12 · 2025-06-26T23:10:13Z

@LeviYeoReum I was thinking about this change in general. Would it make sense to let SEC phase to handle the memory movement? So that DXE phase does not need to know about this? I think leaving the movement to DXE phase and perform operations based on a flag in data is like logic leakage.

Or is there any reason that it cannot be done in SEC phase? In our use case, by the time SEC hands off to DXE, the permanent memory is already available.

LeviYeoReum · 2025-06-27T08:16:07Z

Hi Kun,

Thanks for reviewing this patch :)

@LeviYeoReum I was thinking about this change in general. Would it make sense to let SEC phase to handle the memory movement? So that DXE phase does not need to know about this? I think leaving the movement to DXE phase and perform operations based on a flag in data is like logic leakage.

Or is there any reason that it cannot be done in SEC phase? In our use case, by the time SEC hands off to DXE, the permanent memory is already available.

Actually for PeilessSec as you said, this is true. it don't need to do memory movement.
However, what I thought is when SEC + PEI phase is enabled and SEC allocates the Rx/Tx buffer.
In this sitaution, SEC couldn't use the permanent memory but it could be used by PEI second phase.
But, Suppose no PEIM uses the ArmFfaLib.
Then the Rx/Tx buffer allocated by SEC still allocated in temporary memory,
so If the DXE doesn't handle the memory movement, It wouldn't use the Rx/Tx buffer properly.

Thanks.

kuqin12 · 2025-06-27T17:19:11Z

Hi Kun,

Thanks for reviewing this patch :)

@LeviYeoReum I was thinking about this change in general. Would it make sense to let SEC phase to handle the memory movement? So that DXE phase does not need to know about this? I think leaving the movement to DXE phase and perform operations based on a flag in data is like logic leakage.
Or is there any reason that it cannot be done in SEC phase? In our use case, by the time SEC hands off to DXE, the permanent memory is already available.

Actually for PeilessSec as you said, this is true. it don't need to do memory movement. However, what I thought is when SEC + PEI phase is enabled and SEC allocates the Rx/Tx buffer. In this sitaution, SEC couldn't use the permanent memory but it could be used by PEI second phase. But, Suppose no PEIM uses the ArmFfaLib. Then the Rx/Tx buffer allocated by SEC still allocated in temporary memory, so If the DXE doesn't handle the memory movement, It wouldn't use the Rx/Tx buffer properly.

Thanks.

I see. Please correct me if I misunderstood, we mainly have 2 scenarios:

Boot Process	Notes
SEC -> DXE	No memory movement
SEC -> PEI -> DXE	Need movement in PEI

The concern is mainly around when no PEIM uses FFA, correct? Wondering if you have considered using a separate PEIM to handle the movement? We are currently imposing all FFA consuming PEIMs to register a callback, is that necessary?

A less-than-optimal, but simpler solution is to remap the buffer regardless in DXE phase. This is trading the complicated logic of carrying on the information with a little overhead of remapping the buffer, unless you can think of any reason why DXE has to use the same Rx/Tx buffer as PEI.

LeviYeoReum · 2025-06-27T19:02:23Z

Hi Kun,

I see. Please correct me if I misunderstood, we mainly have 2 scenarios:

Boot Process Notes
SEC -> DXE No memory movement

This case is PeilessSec. So Yes.

SEC -> PEI -> DXE Need movement in PEI

Here is tow case.
- In PEI phase no one use ArmFfaPeiLib so, movement occurs in PEI so Dxe do it.
- PEI do memory movement.

The concern is mainly around when no PEIM uses FFA, correct?

Yes.

Wondering if you have considered using a separate PEIM to handle the movement? We are currently imposing all FFA >consuming PEIMs to register a callback, is that necessary?

Yes. if PEIM use ArmFfaPeiLib. it's done by ArmFfaLib.
But in case of doing no PEIM using ArmFfaPeiLib, makes a PEIM seems too much.

A less-than-optimal, but simpler solution is to remap the buffer regardless in DXE phase. This is trading the complicated logic of carrying on the information with a little overhead of remapping the buffer, unless you can think of any reason why DXE has to use the same Rx/Tx buffer as PEI.

Hmm.. This seems not good for me.
If Rx/Tx buffer is allocated in ealry PEI phase (before permenant memory use), It's allocated as "Reserved Memory".
But If SPMC requires minimum alignment as 64KB. It's too big to take it as overhead (That's why I think it's a "LEAK").
As you said, There's no reason we must use "the same Rx/Tx Buffer". But we care the "LEAK".
Also, access the Temporary memory after PEIM can use permanent memory seems the UAF.

Thanks ;)

kuqin12 · 2025-06-27T20:27:59Z

Wondering if you have considered using a separate PEIM to handle the movement? We are currently imposing all FFA >consuming PEIMs to register a callback, is that necessary?

Yes. if PEIM use ArmFfaPeiLib. it's done by ArmFfaLib. But in case of doing no PEIM using ArmFfaPeiLib, makes a PEIM seems too much.

Is a PEIM really considered too much? I think it might be better than sprinkle the callbacks around all PEIMs that do use FFA?

A less-than-optimal, but simpler solution is to remap the buffer regardless in DXE phase. This is trading the complicated logic of carrying on the information with a little overhead of remapping the buffer, unless you can think of any reason why DXE has to use the same Rx/Tx buffer as PEI.

Hmm.. This seems not good for me. If Rx/Tx buffer is allocated in ealry PEI phase (before permenant memory use), It's allocated as "Reserved Memory". But If SPMC requires minimum alignment as 64KB. It's too big to take it as overhead (That's why I think it's a "LEAK"). As you said, There's no reason we must use "the same Rx/Tx Buffer". But we care the "LEAK". Also, access the Temporary memory after PEIM can use permanent memory seems the UAF.

Sorry, maybe I missed your point of "LEAK". But even if we stick to the same buffer throughout the boot phase, OS/hypervisor will remap their Rx/Tx buffer anyway. Would that not be a leakage?

LeviYeoReum · 2025-06-28T05:11:36Z

Hi Kun,

Is a PEIM really considered too much? I think it might be better than sprinkle the callbacks around all PEIMs that do use FFA?

Hmm, the "Remap" is done only once. I don't think the callback is sprinkled by all PEIM?
Secondly, though Rx/Tx buffer is allocated by Library but remaping is done by PEIM seems much srpinkle for me since
the FF-A user for PEI, it always add one more line in there .dsc file to use ArmFfaPeiLib..

Hmm.. This seems not good for me. If Rx/Tx buffer is allocated in ealry PEI phase (before permenant memory use), It's allocated as "Reserved Memory". But If SPMC requires minimum alignment as 64KB. It's too big to take it as overhead (That's why I think it's a "LEAK"). As you said, There's no reason we must use "the same Rx/Tx Buffer". But we care the "LEAK". Also, access the Temporary memory after PEIM can use permanent memory seems the UAF.

Sorry, maybe I missed your point of "LEAK". But even if we stick to the same buffer throughout the boot phase, OS/hypervisor will remap their Rx/Tx buffer anyway. Would that not be a leakage?

No. When you see the before this patch, we skip the "FreeMemory()" in case of PEIM allocate Rx/Tx buffer
(in PeiServiceMemoryDiscoveredNotifyCallback()).
This means if Rx/Tx Buffer is allocated by PEIM, the former Rx/Tx buffer is still allocated as a "Reserved Memory"
after PEI intialized the permenat memory (the allocated at temporary memory wiill be mirgrated in peremnant memory to by calculating offest) -- for detail, Please see my commit message:
a5d19c5

So, this unused Rx/Tx buffer memory area still reserved in OS/Hypervisor, It's a leak.

Thanks :)

kuqin12 · 2025-06-28T06:08:12Z

Hmm, the "Remap" is done only once. I don't think the callback is sprinkled by all PEIM? Secondly, though Rx/Tx buffer is allocated by Library but remaping is done by PEIM seems much srpinkle for me....

We are imposing all FFA aware PEI modules to carry the check of permanent memory availability. Additionally, the callbacks are registered for each of the PEIMs that will use FFA lib in early PEI phase, correct? I think this will increase the footprint on flash for each involved module. And early PEIMs normally do not have compression.

No. When you see the before this patch, we skip the "FreeMemory()" in case of PEIM allocate Rx/Tx buffer (in PeiServiceMemoryDiscoveredNotifyCallback()). This means if Rx/Tx Buffer is allocated by PEIM, the former Rx/Tx buffer is still allocated as a "Reserved Memory" after PEI intialized the permenat memory (the allocated at temporary memory wiill be allocated in peremnant memory to by calculating offest).

So, this unused Rx/Tx buffer memory area still reserved in OS/Hypervisor, It's a leak.

Are you confirming that, if OS/Hypervisor will not use the same Rx/Tx buffer region, they will "leak" the memory region because it is marked as reserved in UEFI, even after this change?

LeviYeoReum · 2025-06-28T13:44:59Z

Hi Kun,

We are imposing all FFA aware PEI modules to carry the check of permanent memory availability. Additionally, the callbacks are registered for each of the PEIMs that will use FFA lib in early PEI phase, correct? I think this will increase the footprint on flash for each involved module. And early PEIMs normally do not have compression.

No, callback is registered by the first PEIM who allocates the Rx/Tx buffer if Rx/Tx buffer are allocated in Temporary memory.
So, It doesn't impose entry PEIM module to take of it.
I afraid of whether I understand your concern correct or not, But for me separate handling for Remap (migrate) in separate PEIM module makes user mistake easily who want to use ArmFfaPeiLib.
May I ask what is benefit to have separate PEIM to handle Remap only for Rx/Tx buffer taking over my worry?
The increase size for this patch for code area seems ignorable I think compared to have separate PEIM module for this (Including basic library for ths PEIM and etc..?).

Are you confirming that, if OS/Hypervisor will not use the same Rx/Tx buffer region, they will "leak" the memory region because it is marked as reserved in UEFI, even after this change?

Before this patch, Yes.

Allocate Rx/Tx buffer in temporary memory.
while Rx/Tx buffer is mirgrated after permanent my use, the Rx/Tx buffer allocated in temporary memory is migrated too.
at the Callback for PEIM memory, It allocates New "Rx/Tx" buffer, So (2) buffer is leaked and still remain as "Reserved"
(NOTE: It saves this information in the "HOB", so Dxe reserves this memory as "Reserved Memory")

After this Patch, No.
Since:
1. Rx/Tx buffer is remapped with migrated address, in this progress, there is no allocation.
2. At the ExitBootService, this area is freed via FreeMemory() this means the area is remarked as Conventional memory.
So no memory leak for this.

Thanks!

kuqin12 · 2025-06-28T18:53:55Z

Before this patch, Yes.

Allocate Rx/Tx buffer in temporary memory.

while Rx/Tx buffer is mirgrated after permanent my use, the Rx/Tx buffer allocated in temporary memory is migrated too.

at the Callback for PEIM memory, It allocates New "Rx/Tx" buffer, So (2) buffer is leaked and still remain as "Reserved"
(NOTE: It saves this information in the "HOB", so Dxe reserves this memory as "Reserved Memory")

After this Patch, No. Since: 1. Rx/Tx buffer is remapped with migrated address, in this progress, there is no allocation. 2. At the ExitBootService, this area is freed via FreeMemory() this means the area is remarked as Conventional memory. So no memory leak for this.

Great. The migration part makes sense.

We have been all over the places during the conversation. My overall point was that I hope the PEI being the only one that needs to handle the logic. A separate PEIM will cover the edge case if no PEIM uses FFA. The single module probably will save the footprint more scalablely. But you can decide how to proceed on that point.

MdeModulePkg/Library/ArmFfaLib/ArmFfaSecRxTxMap.c

MdeModulePkg/Include/Guid/ArmFfaRxTxBufferInfo.h

LeviYeoReum · 2025-06-30T09:43:08Z

Before this patch, Yes.

Allocate Rx/Tx buffer in temporary memory.

while Rx/Tx buffer is mirgrated after permanent my use, the Rx/Tx buffer allocated in temporary memory is migrated too.

at the Callback for PEIM memory, It allocates New "Rx/Tx" buffer, So (2) buffer is leaked and still remain as "Reserved"
(NOTE: It saves this information in the "HOB", so Dxe reserves this memory as "Reserved Memory")

After this Patch, No. Since: 1. Rx/Tx buffer is remapped with migrated address, in this progress, there is no allocation. 2. At the ExitBootService, this area is freed via FreeMemory() this means the area is remarked as Conventional memory. So no memory leak for this.

Great. The migration part makes sense.

Thanks ;)

We have been all over the places during the conversation. My overall point was that I hope the PEI being the only one that needs to handle the logic. A separate PEIM will cover the edge case if no PEIM uses FFA. The single module probably will save the footprint more scalablely. But you can decide how to proceed on that point

I understood what is your point. But, IMHO, I'm not sure the add PEIM really saves the footprint taking the duty to add the PEIM on every platform which want to use ArmFfaPeiLib and a risk -- not add the the PEIM for handling this.

Also, I'm not sure about the feature "edge case" like this problem -- handling something over the Phases.
if this happen in near future, I think It would be better to add at that time since for handling single problem to add one more PEIM seems to increase footprint for me.

If you agree, I want to remain as it is right now.

Thanks.

tianocore-assign-reviewers · 2025-06-30T10:08:44Z

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MdeModulePkg/Include/Guid/ArmFfaRxTxBufferInfo.h

MdeModulePkg/Library/ArmFfaLib/ArmFfaStandaloneMmRxTxMap.c

LeviYeoReum · 2025-07-02T13:10:02Z

Hi @samerhaj and @lgao4,

If there is no problem, Would you merge this patch series please?

Thanks.

lgao4 · 2025-07-04T01:40:42Z

Hi @samerhaj and @lgao4,

If there is no problem, Would you merge this patch series please?

Thanks.

If no more comments, I will merge it next week.

MdeModulePkg/Library/ArmFfaLib/ArmFfaPeiLib.c

MdeModulePkg/MdeModulePkg.dec

MdeModulePkg/Library/ArmFfaLib/ArmFfaPeiLib.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaRxTxMap.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaSecLib.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaSecRxTxMap.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaStandaloneMmRxTxMap.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaCommon.c

MdeModulePkg/Library/ArmFfaLib/ArmFfaRxTxMap.c

MdeModulePkg/Include/Guid/ArmFfaRxTxBufferInfo.h

LeviYeoReum · 2025-07-14T08:43:01Z

Hi @samimujawar and @lgao4

Could you merge this patch series please?

samimujawar

Looks like one minor comment change was lost. Otherwise this PR looks good to me.

MdeModulePkg/Library/ArmFfaLib/ArmFfaPeiLib.c

The commit e15fe06 ("MdeModulePkg/Library: make ArmFfaPeiLib available early PEIM stage") uses ArmFfaPeiLib in the early PEIM stage. However, the Rx/Tx buffer allocated in the early PEIM stage uses temporary memory. This results in a memory leak when the temporary memory's heap is relocated to permanent memory. For example, if the Rx/Tx buffer memory is allocated at 0x20006000 in temporary memory, and if offset between temporary memory and permanent is 0x40000000, then: - Once permanent memory installed the temporary memory at 0x20006000 is migrated to 0x60006000. - However, ArmFfaPeiLib allocates new Rx/Tx buffer without freeing the migrated Rx/Tx buffers, i.e. the buffers at 0x60006000. This results in a memory leak as the migrated Rx/Tx buffer area is lost. To address this memory leak, use the MemoryAllocationHob's name, so that the migrated memory area will be reused as Rx/Tx buffer. This patch also includes rename ArmFfaRxTxStmm.c to ArmFfaStandaloneMmRxTxMap.c to keep the file name convention in ArmFfaLib with ArmFfa{Phase}{...}.c Fixes: e15fe06 ("MdeModulePkg/Library: ...") Signed-off-by: Yeoreum Yun <[email protected]> Continuous-integration-options: PatchCheck.ignore-multi-package

The PcdFfaTxRxPageCount can never be changed dynamically and is configured at build time to specify the size of the Rx/Tx buffers. Therefore, make PcdFfaTxRxPageCount a PcdsFixedAtBuild PCD. Signed-off-by: Yeoreum Yun <[email protected]>

To use Arm-FFA intereface in PeilessSec, implments ArmFfaSecLib used by PeilessSec. For example, communicate with TPM service using CRB over ARM-FFA (via Tpm2DeviceLibFfa), PeilessSec need to use Arm-FFA interface. Signed-off-by: Yeoreum Yun <[email protected]>

Some of code for handling Rx/Tx buffer is duplicate. This patch commonize some of duplication routine used in Rx/Tx buffer related functions. Signed-off-by: Yeoreum Yun <[email protected]>

…erInfo Change type of buffer address type in ArmFfaRxTxBufferInfo so that reduce the type casting. Signed-off-by: Yeoreum Yun <[email protected]>

LeviYeoReum · 2025-07-14T09:57:23Z

Looks like one minor comment change was lost. Otherwise this PR looks good to me.

Thanks. I've updated it !

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MdeModulePkg/Library: commonize some duplicate code in ArmFfaLib

23c2e43

Some of code for handling Rx/Tx buffer is duplicate. This patch commonize some of duplication routine used in Rx/Tx buffer related functions. Signed-off-by: Yeoreum Yun <[email protected]>

MdeModulePkg/Include: change type of buffer address in ArmFfaRxTxBuff…

73bdc5b

…erInfo Change type of buffer address type in ArmFfaRxTxBufferInfo so that reduce the type casting. Signed-off-by: Yeoreum Yun <[email protected]>

LeviYeoReum force-pushed the levi/arm_ffa_sec_lib branch from 43388aa to 73bdc5b Compare July 14, 2025 09:54

samimujawar added the push Auto push patch series in PR if all checks pass label Jul 14, 2025

Merge branch 'master' into levi/arm_ffa_sec_lib

e5314db

mergify bot merged commit f85c718 into tianocore:master Jul 14, 2025
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kuqin12 mentioned this pull request Aug 6, 2025

[Cherry-Pick] Update ArmFfaLib to support SEC and STMM phase microsoft/mu_basecore#1464

Merged

6 tasks

MdeModulePkg/Library: Fix memory leak for ArmFfaLib's Rx/Tx buffer and add ArmFfaLib for PeilessSec #11166

MdeModulePkg/Library: Fix memory leak for ArmFfaLib's Rx/Tx buffer and add ArmFfaLib for PeilessSec #11166

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