170 lines
6.0 KiB
Diff
170 lines
6.0 KiB
Diff
From 0120fb7b5877ab40537fd17e64772f53bc89cd07 Mon Sep 17 00:00:00 2001
|
|
From: Ard Biesheuvel <ardb@kernel.org>
|
|
Date: Mon, 4 Dec 2023 10:41:08 +0100
|
|
Subject: [PATCH] ArmVirtQemu: Allow EFI memory attributes protocol to be
|
|
disabled
|
|
|
|
Shim's PE loader uses the EFI memory attributes protocol in a way that
|
|
results in an immediate crash when invoking the loaded image, unless the
|
|
base and size of its executable segment are both aligned to 4k.
|
|
|
|
If this is not the case, it will strip the memory allocation of its
|
|
executable permissions, but fail to add them back for the executable
|
|
region, resulting in non-executable code. Unfortunately, the PE loader
|
|
does not even bother invoking the protocol in this case (as it notices
|
|
the misalignment), making it very hard for system firmware to work
|
|
around this by attempting to infer the intent of the caller.
|
|
|
|
So let's introduce a QEMU command line option to indicate that the
|
|
protocol should not be exposed at all, and a PCD to set the default for
|
|
this option when it is omitted.
|
|
|
|
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
|
|
Tested-by: Gerd Hoffmann <kraxel@redhat.com>
|
|
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
|
|
Link: https://gitlab.com/qemu-project/qemu/-/issues/1990
|
|
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
|
|
(cherry picked from commit cee7ba349c0c1ce489001a338a4e28555728b573)
|
|
---
|
|
ArmVirtPkg/ArmVirtPkg.dec | 6 ++
|
|
.../PlatformBootManagerLib/PlatformBm.c | 64 +++++++++++++++++++
|
|
.../PlatformBootManagerLib.inf | 3 +
|
|
3 files changed, 73 insertions(+)
|
|
|
|
diff --git a/ArmVirtPkg/ArmVirtPkg.dec b/ArmVirtPkg/ArmVirtPkg.dec
|
|
index 0f2d787327..313aebda90 100644
|
|
--- a/ArmVirtPkg/ArmVirtPkg.dec
|
|
+++ b/ArmVirtPkg/ArmVirtPkg.dec
|
|
@@ -68,3 +68,9 @@
|
|
# Cloud Hypervisor has no other way to pass Rsdp address to the guest except use a PCD.
|
|
#
|
|
gArmVirtTokenSpaceGuid.PcdCloudHvAcpiRsdpBaseAddress|0x0|UINT64|0x00000005
|
|
+
|
|
+ ##
|
|
+ # Whether the EFI memory attributes protocol should be uninstalled before
|
|
+ # invoking the OS loader. This may be needed to work around problematic
|
|
+ # builds of shim that use the protocol incorrectly.
|
|
+ gArmVirtTokenSpaceGuid.PcdUninstallMemAttrProtocol|FALSE|BOOLEAN|0x00000006
|
|
diff --git a/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c b/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c
|
|
index 85c01351b0..8e93f3cfed 100644
|
|
--- a/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c
|
|
+++ b/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c
|
|
@@ -16,6 +16,7 @@
|
|
#include <Library/PcdLib.h>
|
|
#include <Library/PlatformBmPrintScLib.h>
|
|
#include <Library/QemuBootOrderLib.h>
|
|
+#include <Library/QemuFwCfgSimpleParserLib.h>
|
|
#include <Library/TpmPlatformHierarchyLib.h>
|
|
#include <Library/UefiBootManagerLib.h>
|
|
#include <Protocol/DevicePath.h>
|
|
@@ -1111,6 +1112,49 @@ PlatformBootManagerBeforeConsole (
|
|
FilterAndProcess (&gEfiPciIoProtocolGuid, IsVirtioPciSerial, SetupVirtioSerial);
|
|
}
|
|
|
|
+/**
|
|
+ Uninstall the EFI memory attribute protocol if it exists.
|
|
+**/
|
|
+STATIC
|
|
+VOID
|
|
+UninstallEfiMemoryAttributesProtocol (
|
|
+ VOID
|
|
+ )
|
|
+{
|
|
+ EFI_STATUS Status;
|
|
+ EFI_HANDLE Handle;
|
|
+ UINTN Size;
|
|
+ VOID *MemoryAttributeProtocol;
|
|
+
|
|
+ Size = sizeof (Handle);
|
|
+ Status = gBS->LocateHandle (
|
|
+ ByProtocol,
|
|
+ &gEfiMemoryAttributeProtocolGuid,
|
|
+ NULL,
|
|
+ &Size,
|
|
+ &Handle
|
|
+ );
|
|
+
|
|
+ if (EFI_ERROR (Status)) {
|
|
+ ASSERT (Status == EFI_NOT_FOUND);
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ Status = gBS->HandleProtocol (
|
|
+ Handle,
|
|
+ &gEfiMemoryAttributeProtocolGuid,
|
|
+ &MemoryAttributeProtocol
|
|
+ );
|
|
+ ASSERT_EFI_ERROR (Status);
|
|
+
|
|
+ Status = gBS->UninstallProtocolInterface (
|
|
+ Handle,
|
|
+ &gEfiMemoryAttributeProtocolGuid,
|
|
+ MemoryAttributeProtocol
|
|
+ );
|
|
+ ASSERT_EFI_ERROR (Status);
|
|
+}
|
|
+
|
|
/**
|
|
Do the platform specific action after the console is ready
|
|
Possible things that can be done in PlatformBootManagerAfterConsole:
|
|
@@ -1129,12 +1173,32 @@ PlatformBootManagerAfterConsole (
|
|
)
|
|
{
|
|
RETURN_STATUS Status;
|
|
+ BOOLEAN Uninstall;
|
|
|
|
//
|
|
// Show the splash screen.
|
|
//
|
|
BootLogoEnableLogo ();
|
|
|
|
+ //
|
|
+ // Work around shim's terminally broken use of the EFI memory attributes
|
|
+ // protocol, by uninstalling it if requested on the QEMU command line.
|
|
+ //
|
|
+ // E.g.,
|
|
+ // -fw_cfg opt/org.tianocore/UninstallMemAttrProtocol,string=y
|
|
+ //
|
|
+ Uninstall = FixedPcdGetBool (PcdUninstallMemAttrProtocol);
|
|
+ QemuFwCfgParseBool ("opt/org.tianocore/UninstallMemAttrProtocol", &Uninstall);
|
|
+ DEBUG ((
|
|
+ DEBUG_WARN,
|
|
+ "%a: %auninstalling EFI memory protocol\n",
|
|
+ __func__,
|
|
+ Uninstall ? "" : "not "
|
|
+ ));
|
|
+ if (Uninstall) {
|
|
+ UninstallEfiMemoryAttributesProtocol ();
|
|
+ }
|
|
+
|
|
//
|
|
// Process QEMU's -kernel command line option. The kernel booted this way
|
|
// will receive ACPI tables: in PlatformBootManagerBeforeConsole(), we
|
|
diff --git a/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf b/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
|
|
index 997eb1a442..70e4ebf94a 100644
|
|
--- a/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
|
|
+++ b/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf
|
|
@@ -46,6 +46,7 @@
|
|
PcdLib
|
|
PlatformBmPrintScLib
|
|
QemuBootOrderLib
|
|
+ QemuFwCfgSimpleParserLib
|
|
QemuLoadImageLib
|
|
ReportStatusCodeLib
|
|
TpmPlatformHierarchyLib
|
|
@@ -55,6 +56,7 @@
|
|
UefiRuntimeServicesTableLib
|
|
|
|
[FixedPcd]
|
|
+ gArmVirtTokenSpaceGuid.PcdUninstallMemAttrProtocol
|
|
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
|
|
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits
|
|
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity
|
|
@@ -73,5 +75,6 @@
|
|
[Protocols]
|
|
gEfiFirmwareVolume2ProtocolGuid
|
|
gEfiGraphicsOutputProtocolGuid
|
|
+ gEfiMemoryAttributeProtocolGuid
|
|
gEfiPciRootBridgeIoProtocolGuid
|
|
gVirtioDeviceProtocolGuid
|