196 lines
6.8 KiB
Diff
196 lines
6.8 KiB
Diff
From 6b3795dcecf31b0d8aa7edabeffccf37b7259ff0 Mon Sep 17 00:00:00 2001
|
|
From: Jon Maloy <jmaloy@redhat.com>
|
|
Date: Thu, 20 Jun 2024 16:09:46 -0400
|
|
Subject: [PATCH 22/31] SecurityPkg/RngDxe: Use GetRngGuid() when probing
|
|
RngLib
|
|
|
|
RH-Author: Jon Maloy <jmaloy@redhat.com>
|
|
RH-MergeRequest: 77: UINT32 overflow in S3 ResumeCount and Pixiefail fixes
|
|
RH-Jira: RHEL-21854 RHEL-21856 RHEL-40099
|
|
RH-Acked-by: Gerd Hoffmann <None>
|
|
RH-Commit: [22/31] 17b40bc3daeba2ba8407826e17f3096c4a5151c6
|
|
|
|
JIRA: https://issues.redhat.com/browse/RHEL-21856
|
|
Upstream: Merged
|
|
CVE: CVE-2023-45237
|
|
|
|
commit 19438cff973bfb35a1ef12fab45fabb28b63fe64
|
|
Author: Pierre Gondois <pierre.gondois@arm.com>
|
|
Date: Fri Aug 11 16:33:09 2023 +0200
|
|
|
|
SecurityPkg/RngDxe: Use GetRngGuid() when probing RngLib
|
|
|
|
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4151
|
|
|
|
The EFI_RNG_PROTOCOL can rely on the RngLib. The RngLib has multiple
|
|
implementations, some of them are unsafe (e.g. BaseRngLibTimerLib).
|
|
To allow the RngDxe to detect when such implementation is used,
|
|
a GetRngGuid() function was added in a previous patch.
|
|
|
|
The EFI_RNG_PROTOCOL can advertise multiple algorithms through
|
|
Guids. The PcdCpuRngSupportedAlgorithm is currently used to
|
|
advertise the RngLib in the Arm implementation.
|
|
|
|
The issues of doing that are:
|
|
- the RngLib implementation might not use CPU instructions,
|
|
cf. the BaseRngLibTimerLib
|
|
- most platforms don't set PcdCpuRngSupportedAlgorithm
|
|
|
|
A GetRngGuid() was added to the RngLib in a previous patch,
|
|
allowing to identify the algorithm implemented by the RngLib.
|
|
Make use of this function and place the unsage algorithm
|
|
at the last position in the mAvailableAlgoArray.
|
|
|
|
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
|
|
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
|
|
Acked-by: Ard Biesheuvel <ardb@kernel.org>
|
|
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
|
|
Tested-by: Kun Qin <kun.qin@microsoft.com>
|
|
|
|
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
|
|
---
|
|
.../RngDxe/AArch64/AArch64Algo.c | 55 +++++++++++++------
|
|
.../RandomNumberGenerator/RngDxe/ArmRngDxe.c | 8 ++-
|
|
.../RandomNumberGenerator/RngDxe/RngDxe.inf | 4 +-
|
|
3 files changed, 45 insertions(+), 22 deletions(-)
|
|
|
|
diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/AArch64Algo.c b/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/AArch64Algo.c
|
|
index e8be217f8a..a270441ebb 100644
|
|
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/AArch64Algo.c
|
|
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/AArch64/AArch64Algo.c
|
|
@@ -10,6 +10,8 @@
|
|
#include <Library/DebugLib.h>
|
|
#include <Library/MemoryAllocationLib.h>
|
|
#include <Library/ArmTrngLib.h>
|
|
+#include <Library/RngLib.h>
|
|
+#include <Guid/RngAlgorithm.h>
|
|
|
|
#include "RngDxeInternals.h"
|
|
|
|
@@ -28,9 +30,13 @@ GetAvailableAlgorithms (
|
|
VOID
|
|
)
|
|
{
|
|
- UINT64 DummyRand;
|
|
- UINT16 MajorRevision;
|
|
- UINT16 MinorRevision;
|
|
+ EFI_STATUS Status;
|
|
+ UINT16 MajorRevision;
|
|
+ UINT16 MinorRevision;
|
|
+ GUID RngGuid;
|
|
+ BOOLEAN UnSafeAlgo;
|
|
+
|
|
+ UnSafeAlgo = FALSE;
|
|
|
|
// Rng algorithms 2 times, one for the allocation, one to populate.
|
|
mAvailableAlgoArray = AllocateZeroPool (RNG_AVAILABLE_ALGO_MAX);
|
|
@@ -38,24 +44,29 @@ GetAvailableAlgorithms (
|
|
return EFI_OUT_OF_RESOURCES;
|
|
}
|
|
|
|
- // Check RngGetBytes() before advertising PcdCpuRngSupportedAlgorithm.
|
|
- if (!EFI_ERROR (RngGetBytes (sizeof (DummyRand), (UINT8 *)&DummyRand))) {
|
|
- CopyMem (
|
|
- &mAvailableAlgoArray[mAvailableAlgoArrayCount],
|
|
- PcdGetPtr (PcdCpuRngSupportedAlgorithm),
|
|
- sizeof (EFI_RNG_ALGORITHM)
|
|
- );
|
|
- mAvailableAlgoArrayCount++;
|
|
-
|
|
- DEBUG_CODE_BEGIN ();
|
|
- if (IsZeroGuid (PcdGetPtr (PcdCpuRngSupportedAlgorithm))) {
|
|
+ // Identify RngLib algorithm.
|
|
+ Status = GetRngGuid (&RngGuid);
|
|
+ if (!EFI_ERROR (Status)) {
|
|
+ if (IsZeroGuid (&RngGuid) ||
|
|
+ CompareGuid (&RngGuid, &gEdkiiRngAlgorithmUnSafe))
|
|
+ {
|
|
+ // Treat zero GUID as an unsafe algorithm
|
|
DEBUG ((
|
|
DEBUG_WARN,
|
|
- "PcdCpuRngSupportedAlgorithm should be a non-zero GUID\n"
|
|
+ "RngLib uses an Unsafe algorithm and "
|
|
+ "must not be used for production builds.\n"
|
|
));
|
|
+ // Set the UnSafeAlgo flag to indicate an unsafe algorithm was found
|
|
+ // so that it can be added at the end of the algorithm list.
|
|
+ UnSafeAlgo = TRUE;
|
|
+ } else {
|
|
+ CopyMem (
|
|
+ &mAvailableAlgoArray[mAvailableAlgoArrayCount],
|
|
+ &RngGuid,
|
|
+ sizeof (RngGuid)
|
|
+ );
|
|
+ mAvailableAlgoArrayCount++;
|
|
}
|
|
-
|
|
- DEBUG_CODE_END ();
|
|
}
|
|
|
|
// Raw algorithm (Trng)
|
|
@@ -68,5 +79,15 @@ GetAvailableAlgorithms (
|
|
mAvailableAlgoArrayCount++;
|
|
}
|
|
|
|
+ // Add unsafe algorithm at the end of the list.
|
|
+ if (UnSafeAlgo) {
|
|
+ CopyMem (
|
|
+ &mAvailableAlgoArray[mAvailableAlgoArrayCount],
|
|
+ &gEdkiiRngAlgorithmUnSafe,
|
|
+ sizeof (EFI_RNG_ALGORITHM)
|
|
+ );
|
|
+ mAvailableAlgoArrayCount++;
|
|
+ }
|
|
+
|
|
return EFI_SUCCESS;
|
|
}
|
|
diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/ArmRngDxe.c b/SecurityPkg/RandomNumberGenerator/RngDxe/ArmRngDxe.c
|
|
index 0e44d0c931..2fc36fc186 100644
|
|
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/ArmRngDxe.c
|
|
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/ArmRngDxe.c
|
|
@@ -76,8 +76,9 @@ RngGetRNG (
|
|
OUT UINT8 *RNGValue
|
|
)
|
|
{
|
|
- EFI_STATUS Status;
|
|
+ EFI_STATUS Status;
|
|
UINTN Index;
|
|
+ GUID RngGuid;
|
|
|
|
if ((This == NULL) || (RNGValueLength == 0) || (RNGValue == NULL)) {
|
|
return EFI_INVALID_PARAMETER;
|
|
@@ -102,7 +103,10 @@ RngGetRNG (
|
|
}
|
|
|
|
FoundAlgo:
|
|
- if (CompareGuid (RNGAlgorithm, PcdGetPtr (PcdCpuRngSupportedAlgorithm))) {
|
|
+ Status = GetRngGuid (&RngGuid);
|
|
+ if (!EFI_ERROR (Status) &&
|
|
+ CompareGuid (RNGAlgorithm, &RngGuid))
|
|
+ {
|
|
Status = RngGetBytes (RNGValueLength, RNGValue);
|
|
return Status;
|
|
}
|
|
diff --git a/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf b/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf
|
|
index d6c2d30195..8704a64441 100644
|
|
--- a/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf
|
|
+++ b/SecurityPkg/RandomNumberGenerator/RngDxe/RngDxe.inf
|
|
@@ -75,13 +75,11 @@
|
|
gEfiRngAlgorithmX9313DesGuid ## SOMETIMES_PRODUCES ## GUID # Unique ID of the algorithm for RNG
|
|
gEfiRngAlgorithmX931AesGuid ## SOMETIMES_PRODUCES ## GUID # Unique ID of the algorithm for RNG
|
|
gEfiRngAlgorithmRaw ## SOMETIMES_PRODUCES ## GUID # Unique ID of the algorithm for RNG
|
|
+ gEdkiiRngAlgorithmUnSafe ## SOMETIMES_PRODUCES ## GUID # Unique ID of the algorithm for RNG
|
|
|
|
[Protocols]
|
|
gEfiRngProtocolGuid ## PRODUCES
|
|
|
|
-[Pcd.AARCH64]
|
|
- gEfiMdePkgTokenSpaceGuid.PcdCpuRngSupportedAlgorithm ## CONSUMES
|
|
-
|
|
[Depex]
|
|
TRUE
|
|
|
|
--
|
|
2.39.3
|
|
|