MSVSphere Packaging Team
1 month ago
parent
067f11e1d5
commit
f293c80a1b
GPG Key ID:
B2B0B9F29E528FE8
@ -0,0 +1,350 @@
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From 7dcc1de7727fe15f17d18e727cdd7f11e93d147a Mon Sep 17 00:00:00 2001
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From: Oliver Steffen <osteffen@redhat.com>
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Date: Mon, 4 Nov 2024 12:40:12 +0100
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Subject: [PATCH 1/2] OvmfPkg: Add a Fallback RNG (RH only)
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RH-Author: Oliver Steffen <osteffen@redhat.com>
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RH-MergeRequest: 82: Add a Fallback RNG (RH only)
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RH-Jira: RHEL-66234
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Commit: [1/2] bb62ac9e3f1cd5eae1bb94e047fb6ebada57cd24 (osteffen/edk2)
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Since the pixiefail CVE fix, the network stack requires a random number
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generator.
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In case there is no hardware random number generator available,
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have the Platform Boot Manager install a pseudo RNG to ensure
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the network can be used.
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Signed-off-by: Oliver Steffen <osteffen@redhat.com>
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---
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.../PlatformBootManagerLib/BdsPlatform.c | 7 +
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.../PlatformBootManagerLib/FallbackRng.c | 222 ++++++++++++++++++
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.../PlatformBootManagerLib/FallbackRng.h | 20 ++
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.../PlatformBootManagerLib.inf | 5 +
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4 files changed, 254 insertions(+)
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create mode 100644 OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.c
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create mode 100644 OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.h
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diff --git a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
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index d9f61757cf..87d1ac3142 100644
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--- a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
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+++ b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
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@@ -15,6 +15,8 @@
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#include <Library/Tcg2PhysicalPresenceLib.h>
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#include <Library/XenPlatformLib.h>
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+#include "FallbackRng.h"
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+
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//
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// Global data
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//
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@@ -539,6 +541,9 @@ PlatformBootManagerBeforeConsole (
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ConnectVirtioPciRng,
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NULL
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);
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+
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+ FallbackRngCheckAndInstall ();
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+
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}
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EFI_STATUS
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@@ -1778,6 +1783,8 @@ PlatformBootManagerAfterConsole (
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DEBUG ((DEBUG_INFO, "PlatformBootManagerAfterConsole\n"));
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+ FallbackRngPrintWarning ();
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+
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if (PcdGetBool (PcdOvmfFlashVariablesEnable)) {
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DEBUG ((
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DEBUG_INFO,
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diff --git a/OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.c b/OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.c
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new file mode 100644
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index 0000000000..bba60e29d5
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--- /dev/null
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+++ b/OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.c
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@@ -0,0 +1,222 @@
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+/** @file
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+ Copyright (C) 2024, Red Hat, Inc.
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+**/
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+
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+#include <Uefi/UefiBaseType.h>
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+#include <Uefi/UefiSpec.h>
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+#include <Protocol/Rng.h>
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+#include <Library/BaseMemoryLib.h>
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+#include <Library/BaseLib.h>
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+#include <Library/DebugLib.h>
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+#include <Library/RngLib.h>
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+#include <Library/UefiBootServicesTableLib.h>
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+#include <Library/UefiLib.h>
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+#include <Library/PrintLib.h>
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+#include <Library/DxeServicesTableLib.h>
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+
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+#include "FallbackRng.h"
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+
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+typedef struct {
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+ EFI_RNG_PROTOCOL Rng;
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+ EFI_HANDLE Handle;
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+} FALLBACK_RNG_DEV;
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+
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+/**
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+ Returns information about the random number generation implementation.
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+
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+ @param[in] This A pointer to the EFI_RNG_PROTOCOL
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+ instance.
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+ @param[in,out] RNGAlgorithmListSize On input, the size in bytes of
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+ RNGAlgorithmList.
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+ On output with a return code of
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+ EFI_SUCCESS, the size in bytes of the
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+ data returned in RNGAlgorithmList. On
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+ output with a return code of
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+ EFI_BUFFER_TOO_SMALL, the size of
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+ RNGAlgorithmList required to obtain the
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+ list.
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+ @param[out] RNGAlgorithmList A caller-allocated memory buffer filled
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+ by the driver with one EFI_RNG_ALGORITHM
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+ element for each supported RNG algorithm.
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+ The list must not change across multiple
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+ calls to the same driver. The first
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+ algorithm in the list is the default
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+ algorithm for the driver.
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+
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+ @retval EFI_SUCCESS The RNG algorithm list was returned
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+ successfully.
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+ @retval EFI_UNSUPPORTED The services is not supported by this
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+ driver.
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+ @retval EFI_DEVICE_ERROR The list of algorithms could not be
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+ retrieved due to a hardware or firmware
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+ error.
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+ @retval EFI_INVALID_PARAMETER One or more of the parameters are
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+ incorrect.
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+ @retval EFI_BUFFER_TOO_SMALL The buffer RNGAlgorithmList is too small
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+ to hold the result.
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+
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+**/
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+STATIC
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+EFI_STATUS
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+EFIAPI
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+FallbackRngGetInfo (
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+ IN EFI_RNG_PROTOCOL *This,
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+ IN OUT UINTN *RNGAlgorithmListSize,
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+ OUT EFI_RNG_ALGORITHM *RNGAlgorithmList
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+ )
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+{
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+ if ((This == NULL) || (RNGAlgorithmListSize == NULL)) {
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+ return EFI_INVALID_PARAMETER;
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+ }
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+
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+ if (*RNGAlgorithmListSize < sizeof (EFI_RNG_ALGORITHM)) {
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+ *RNGAlgorithmListSize = sizeof (EFI_RNG_ALGORITHM);
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+ return EFI_BUFFER_TOO_SMALL;
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+ }
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+
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+ if (RNGAlgorithmList == NULL) {
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+ return EFI_INVALID_PARAMETER;
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+ }
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+
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+ *RNGAlgorithmListSize = sizeof (EFI_RNG_ALGORITHM);
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+ CopyGuid (RNGAlgorithmList, &gEfiRngAlgorithmRaw);
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+
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+ return EFI_SUCCESS;
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+}
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+
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+/**
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+ Produces and returns an RNG value using either the default or specified RNG
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+ algorithm.
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+
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+ @param[in] This A pointer to the EFI_RNG_PROTOCOL
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+ instance.
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+ @param[in] RNGAlgorithm A pointer to the EFI_RNG_ALGORITHM that
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+ identifies the RNG algorithm to use. May
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+ be NULL in which case the function will
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+ use its default RNG algorithm.
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+ @param[in] RNGValueLength The length in bytes of the memory buffer
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+ pointed to by RNGValue. The driver shall
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+ return exactly this numbers of bytes.
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+ @param[out] RNGValue A caller-allocated memory buffer filled
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+ by the driver with the resulting RNG
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+ value.
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+
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+ @retval EFI_SUCCESS The RNG value was returned successfully.
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+ @retval EFI_UNSUPPORTED The algorithm specified by RNGAlgorithm
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+ is not supported by this driver.
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+ @retval EFI_DEVICE_ERROR An RNG value could not be retrieved due
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+ to a hardware or firmware error.
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+ @retval EFI_NOT_READY There is not enough random data available
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+ to satisfy the length requested by
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+ RNGValueLength.
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+ @retval EFI_INVALID_PARAMETER RNGValue is NULL or RNGValueLength is
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+ zero.
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+
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+**/
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+STATIC
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+EFI_STATUS
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+EFIAPI
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+FallbackRngGetRNG (
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+ IN EFI_RNG_PROTOCOL *This,
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+ IN EFI_RNG_ALGORITHM *RNGAlgorithm OPTIONAL,
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+ IN UINTN RNGValueLength,
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+ OUT UINT8 *RNGValue
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+ )
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+{
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+ UINT64 RandomData;
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+ EFI_STATUS Status;
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+ UINTN i;
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+
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+ if ((This == NULL) || (RNGValueLength == 0) || (RNGValue == NULL)) {
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+ return EFI_INVALID_PARAMETER;
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+ }
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+
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+ //
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+ // We only support the raw algorithm, so reject requests for anything else
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+ //
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+ if ((RNGAlgorithm != NULL) &&
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+ !CompareGuid (RNGAlgorithm, &gEfiRngAlgorithmRaw))
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+ {
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+ return EFI_UNSUPPORTED;
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+ }
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+
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+ for (i = 0; i < RNGValueLength; ++i) {
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+ if (i % 4 == 0) {
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+ Status = GetRandomNumber64 (&RandomData);
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+ if (EFI_ERROR (Status)) {
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+ return Status;
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+ }
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+ }
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+ }
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+
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+ return EFI_SUCCESS;
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+}
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+
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+static FALLBACK_RNG_DEV Dev = {
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+ .Rng.GetInfo = FallbackRngGetInfo,
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+ .Rng.GetRNG = FallbackRngGetRNG,
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+ .Handle = NULL,
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+};
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+
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+EFI_STATUS
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+FallbackRngCheckAndInstall (
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+ )
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+{
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+ EFI_STATUS Status;
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+ EFI_HANDLE *HandleBuffer = NULL;
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+ UINTN HandleCount = 0;
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+
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+ if (Dev.Handle != NULL) {
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+ DEBUG ((DEBUG_INFO, "Fallback RNG already installed.\n"));
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+ return EFI_ALREADY_STARTED;
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+ }
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+
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+ Status = gBS->LocateHandleBuffer (
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+ ByProtocol,
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+ &gEfiRngProtocolGuid,
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+ NULL,
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+ &HandleCount,
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+ &HandleBuffer
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+ );
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+
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+ gBS->FreePool (HandleBuffer);
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+
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+ if (Status == EFI_NOT_FOUND) {
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+ HandleCount = 0;
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+ } else if (EFI_ERROR (Status)) {
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+ DEBUG ((DEBUG_ERROR, "Error locating RNG protocol instances: %r\n", Status));
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+ return Status;
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+ }
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+
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+ DEBUG ((DEBUG_INFO, "Found %u RNGs\n", HandleCount));
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+
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+ if (HandleCount == 0) {
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+ // Install RNG
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+ Status = gBS->InstallProtocolInterface (
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+ &Dev.Handle,
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+ &gEfiRngProtocolGuid,
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+ EFI_NATIVE_INTERFACE,
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+ &Dev.Rng
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+ );
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+ if (EFI_ERROR (Status)) {
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+ DEBUG ((DEBUG_ERROR, "Failed to install fallback RNG: %r\n", Status));
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+ return Status;
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+ }
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+
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+ gDS->Dispatch ();
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+ }
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+
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+ return EFI_SUCCESS;
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+}
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+
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+VOID
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+FallbackRngPrintWarning (
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+ )
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+{
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+ if (Dev.Handle != NULL) {
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+ Print (L"WARNING: Pseudo Random Number Generator in use - Pixiefail CVE not mitigated!\n");
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+ DEBUG ((DEBUG_WARN, "WARNING: Pseudo Random Number Generator in use - Pixiefail CVE not mitigated!\n"));
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+ gBS->Stall (2000000);
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+ }
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+}
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diff --git a/OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.h b/OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.h
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new file mode 100644
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index 0000000000..77332bc51c
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--- /dev/null
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+++ b/OvmfPkg/Library/PlatformBootManagerLib/FallbackRng.h
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@@ -0,0 +1,20 @@
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+/** @file
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+ Copyright (C) 2024, Red Hat, Inc.
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+ SPDX-License-Identifier: BSD-2-Clause-Patent
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+**/
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+
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+#ifndef _FALLBACK_RNG_H_
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+#define _FALLBACK_RNG_H_
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+
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+#include <Uefi/UefiBaseType.h>
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+#include <Uefi/UefiSpec.h>
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|
+
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|
+EFI_STATUS
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|
+FallbackRngCheckAndInstall (
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|
+ );
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|
+
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+VOID
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+FallbackRngPrintWarning (
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|
+ );
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|
+
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+#endif
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diff --git a/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf b/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
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index c6ffc1ed9e..211716e30d 100644
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--- a/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
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+++ b/OvmfPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
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@@ -25,6 +25,8 @@
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|
PlatformData.c
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|
QemuKernel.c
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|
BdsPlatform.h
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|
+ FallbackRng.c
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+ FallbackRng.h
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[Packages]
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|
MdePkg/MdePkg.dec
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|
@@ -56,6 +58,7 @@
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|
PlatformBmPrintScLib
|
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|
Tcg2PhysicalPresenceLib
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|
XenPlatformLib
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|
+ RngLib
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|
|
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|
[Pcd]
|
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|
gUefiOvmfPkgTokenSpaceGuid.PcdEmuVariableEvent
|
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|
@@ -80,6 +83,7 @@
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|
gEfiDxeSmmReadyToLockProtocolGuid # PROTOCOL SOMETIMES_PRODUCED
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|
gEfiLoadedImageProtocolGuid # PROTOCOL SOMETIMES_PRODUCED
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|
gEfiFirmwareVolume2ProtocolGuid # PROTOCOL SOMETIMES_CONSUMED
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+ gEfiRngProtocolGuid # PROTOCOL SOMETIMES_PRODUCED
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|
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|
[Guids]
|
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|
gEfiEndOfDxeEventGroupGuid
|
||||||
|
@@ -87,3 +91,4 @@
|
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|
gRootBridgesConnectedEventGroupGuid
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|
gUefiShellFileGuid
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|
gGrubFileGuid
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|
+ gEfiRngAlgorithmRaw
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|
--
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|
2.39.3
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|
|
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@ -0,0 +1,101 @@
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|
From 35d3219a94631eaf437000a60cd63c918b35ba36 Mon Sep 17 00:00:00 2001
|
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|
From: Oliver Steffen <osteffen@redhat.com>
|
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|
Date: Thu, 7 Nov 2024 11:36:22 +0100
|
||||||
|
Subject: [PATCH 2/2] OvmfPkg/ArmVirtPkg: Add a Fallback RNG (RH only)
|
||||||
|
|
||||||
|
RH-Author: Oliver Steffen <osteffen@redhat.com>
|
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|
RH-MergeRequest: 82: Add a Fallback RNG (RH only)
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||||||
|
RH-Jira: RHEL-66234
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||||||
|
RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
|
||||||
|
RH-Commit: [2/2] ae2c04680e6420e096c667a22c52ec6f6fb46935 (osteffen/edk2)
|
||||||
|
|
||||||
|
Since the pixiefail CVE fix, the network stack requires a random number
|
||||||
|
generator.
|
||||||
|
In case there is no hardware random number generator available,
|
||||||
|
have the Platform Boot Manager install a pseudo RNG to ensure
|
||||||
|
the network can be used.
|
||||||
|
|
||||||
|
This patch adds the fallback rng which was introduced in a
|
||||||
|
previous commit also to the ArmVirtPkg PlatformBootManagerLib.
|
||||||
|
|
||||||
|
Signed-off-by: Oliver Steffen <osteffen@redhat.com>
|
||||||
|
---
|
||||||
|
OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBm.c | 6 ++++++
|
||||||
|
.../PlatformBootManagerLibLight/PlatformBootManagerLib.inf | 5 +++++
|
||||||
|
2 files changed, 11 insertions(+)
|
||||||
|
|
||||||
|
diff --git a/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBm.c b/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBm.c
|
||||||
|
index 8e93f3cfed..8aa1e8e2df 100644
|
||||||
|
--- a/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBm.c
|
||||||
|
+++ b/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBm.c
|
||||||
|
@@ -30,6 +30,7 @@
|
||||||
|
#include <Guid/GlobalVariable.h>
|
||||||
|
#include <Guid/RootBridgesConnectedEventGroup.h>
|
||||||
|
#include <Guid/SerialPortLibVendor.h>
|
||||||
|
+#include "FallbackRng.h"
|
||||||
|
|
||||||
|
#include "PlatformBm.h"
|
||||||
|
|
||||||
|
@@ -1029,6 +1030,7 @@ PlatformBootManagerBeforeConsole (
|
||||||
|
//
|
||||||
|
FilterAndProcess (&gEfiGraphicsOutputProtocolGuid, NULL, AddOutput);
|
||||||
|
|
||||||
|
+
|
||||||
|
//
|
||||||
|
// Add the hardcoded short-form USB keyboard device path to ConIn.
|
||||||
|
//
|
||||||
|
@@ -1110,6 +1112,8 @@ PlatformBootManagerBeforeConsole (
|
||||||
|
//
|
||||||
|
FilterAndProcess (&gVirtioDeviceProtocolGuid, IsVirtioSerial, SetupVirtioSerial);
|
||||||
|
FilterAndProcess (&gEfiPciIoProtocolGuid, IsVirtioPciSerial, SetupVirtioSerial);
|
||||||
|
+
|
||||||
|
+ FallbackRngCheckAndInstall ();
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
@@ -1175,6 +1179,8 @@ PlatformBootManagerAfterConsole (
|
||||||
|
RETURN_STATUS Status;
|
||||||
|
BOOLEAN Uninstall;
|
||||||
|
|
||||||
|
+ FallbackRngPrintWarning ();
|
||||||
|
+
|
||||||
|
//
|
||||||
|
// Show the splash screen.
|
||||||
|
//
|
||||||
|
diff --git a/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBootManagerLib.inf b/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBootManagerLib.inf
|
||||||
|
index 8e7cd5605f..4583c05ef4 100644
|
||||||
|
--- a/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBootManagerLib.inf
|
||||||
|
+++ b/OvmfPkg/Library/PlatformBootManagerLibLight/PlatformBootManagerLib.inf
|
||||||
|
@@ -27,6 +27,8 @@
|
||||||
|
PlatformBm.c
|
||||||
|
PlatformBm.h
|
||||||
|
QemuKernel.c
|
||||||
|
+ ../PlatformBootManagerLib/FallbackRng.h
|
||||||
|
+ ../PlatformBootManagerLib/FallbackRng.c
|
||||||
|
|
||||||
|
[Packages]
|
||||||
|
MdeModulePkg/MdeModulePkg.dec
|
||||||
|
@@ -53,6 +55,7 @@
|
||||||
|
UefiBootServicesTableLib
|
||||||
|
UefiLib
|
||||||
|
UefiRuntimeServicesTableLib
|
||||||
|
+ RngLib
|
||||||
|
|
||||||
|
[FixedPcd]
|
||||||
|
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
|
||||||
|
@@ -70,6 +73,7 @@
|
||||||
|
gEfiGlobalVariableGuid
|
||||||
|
gRootBridgesConnectedEventGroupGuid
|
||||||
|
gUefiShellFileGuid
|
||||||
|
+ gEfiRngAlgorithmRaw
|
||||||
|
|
||||||
|
[Protocols]
|
||||||
|
gEfiFirmwareVolume2ProtocolGuid
|
||||||
|
@@ -77,3 +81,4 @@
|
||||||
|
gEfiMemoryAttributeProtocolGuid
|
||||||
|
gEfiPciRootBridgeIoProtocolGuid
|
||||||
|
gVirtioDeviceProtocolGuid
|
||||||
|
+ gEfiRngProtocolGuid
|
||||||
|
--
|
||||||
|
2.39.3
|
||||||
|
|
||||||
Loading…
Reference in new issue