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SecurityPkg: Tcg2Acpi: Remove _DSM Memory Clear and _PTS

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This patch removes the _DSM Memory Clear and MOR
auto-detect functionality via _PTS, as
_DSM Memory Clear was deprecated in TCG PC Client
Reset Attack Mitigation Spec Version 1.10 revision 17
Family "2.0" and _PTS is deemed security deficient.

Signed-off-by: Oliver Smith-Denny <osde@linux.microsoft.com>
This commit is contained in:
John Strange 2024-07-04 08:48:12 -07:00 committed by mergify[bot]
parent a4245b265d
commit 1240a722f8
1 changed files with 4 additions and 61 deletions
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65
SecurityPkg/Tcg/Tcg2Acpi/Tpm.asl
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@ -241,26 +241,10 @@ DefinitionBlock (
Method (PTS, 1, Serialized)
{
//
// Detect Sx state for MOR, only S4, S5 need to handle
// _PTS is deprecated for being security deficient
// this implementation simply returns to maintain
// compatibility with older OSes using it.
//
If (LAnd (LLess (Arg0, 6), LGreater (Arg0, 3)))
{
//
// Bit4 -- DisableAutoDetect. 0 -- Firmware MAY autodetect.
//
If (LNot (And (MORD, 0x10)))
{
//
// Trigger the SMI through ACPI _PTS method.
//
Store (0x02, MCIP)
//
// Trigger the SMI interrupt
//
Store (MCIN, IOPN)
}
}
Return (0)
}
@ -446,43 +430,6 @@ DefinitionBlock (
Return (1)
}
Method (TMCI, 2, Serialized, 0, IntObj, {UnknownObj, UnknownObj}) // IntObj, PkgObj
{
//
// Switch by function index
//
Switch (ToInteger (Arg0))
{
Case (0)
{
//
// Standard query, supports function 1-1
//
Return (Buffer () {0x03})
}
Case (1)
{
//
// Save the Operation Value of the Request to MORD (reserved memory)
//
Store (DerefOf (Index (Arg1, 0x00)), MORD)
//
// Trigger the SMI through ACPI _DSM method.
//
Store (0x01, MCIP)
//
// Trigger the SMI interrupt
//
Store (MCIN, IOPN)
Return (MRET)
}
Default {BreakPoint}
}
Return (1)
}
Method (_DSM, 4, Serialized, 0, UnknownObj, {BuffObj, IntObj, IntObj, PkgObj})
{
@ -503,12 +450,8 @@ DefinitionBlock (
}
//
// TCG Memory Clear Interface
// _DSM Memory Clear is deprecated, so not called
//
If(LEqual(Arg0, ToUUID ("376054ed-cc13-4675-901c-4756d7f2d45d")))
{
Return (TMCI (Arg2, Arg3))
}
Return (Buffer () {0})
}