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| author | Brijesh Singh <brijesh.singh@amd.com> | 2017-10-05 15:16:42 -0500 |
|---|---|---|
| committer | Laszlo Ersek <lersek@redhat.com> | 2017-10-17 21:28:27 +0200 |
| commit | 6041ac65ae879389f3ab5c0699f916d3e71c97fe (patch) | |
| tree | 7fc1093afd722d3c8c2eb47c30d382746c2cabce /OvmfPkg/PlatformPei | |
| parent | 071f1d19ddbc4abaaccbddfc7d6fcc5677f9b5c3 (diff) | |
| download | edk2-6041ac65ae879389f3ab5c0699f916d3e71c97fe.tar.gz edk2-6041ac65ae879389f3ab5c0699f916d3e71c97fe.tar.bz2 edk2-6041ac65ae879389f3ab5c0699f916d3e71c97fe.zip | |
OvmfPkg/PlatformPei: DENY_EXECUTE_ON_SECURITY_VIOLATION when SEV is active
The following commit:
1fea9ddb4e3f OvmfPkg: execute option ROM images regardless of Secure Boot
sets the OptionRomImageVerificationPolicy to ALWAYS_EXECUTE the expansion
ROMs attached to the emulated PCI devices. A expansion ROM constitute
another channel through which a cloud provider (i.e hypervisor) can
inject a code in guest boot flow to compromise it.
When SEV is enabled, the bios code has been verified by the guest owner
via the SEV guest launch sequence before its executed. When secure boot,
is enabled, lets make sure that we do not allow guest bios to execute a
code which is not signed by the guest owner.
Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=728
Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'OvmfPkg/PlatformPei')
| -rw-r--r-- | OvmfPkg/PlatformPei/AmdSev.c | 7 | ||||
| -rw-r--r-- | OvmfPkg/PlatformPei/PlatformPei.inf | 2 |
2 files changed, 9 insertions, 0 deletions
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c index 26f7c3fdbb..1539e5b5cd 100644 --- a/OvmfPkg/PlatformPei/AmdSev.c +++ b/OvmfPkg/PlatformPei/AmdSev.c @@ -59,4 +59,11 @@ AmdSevInitialize ( ASSERT_RETURN_ERROR (PcdStatus);
DEBUG ((DEBUG_INFO, "SEV is enabled (mask 0x%lx)\n", EncryptionMask));
+
+ //
+ // Set Pcd to Deny the execution of option ROM when security
+ // violation.
+ //
+ PcdStatus = PcdSet32S (PcdOptionRomImageVerificationPolicy, 0x4);
+ ASSERT_RETURN_ERROR (PcdStatus);
}
diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf index 16a8db7b0b..de7434d93d 100644 --- a/OvmfPkg/PlatformPei/PlatformPei.inf +++ b/OvmfPkg/PlatformPei/PlatformPei.inf @@ -41,6 +41,7 @@ IntelFrameworkModulePkg/IntelFrameworkModulePkg.dec
MdePkg/MdePkg.dec
MdeModulePkg/MdeModulePkg.dec
+ SecurityPkg/SecurityPkg.dec
UefiCpuPkg/UefiCpuPkg.dec
OvmfPkg/OvmfPkg.dec
@@ -96,6 +97,7 @@ gEfiMdeModulePkgTokenSpaceGuid.PcdPropertiesTableEnable
gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiS3Enable
gEfiMdeModulePkgTokenSpaceGuid.PcdPteMemoryEncryptionAddressOrMask
+ gEfiSecurityPkgTokenSpaceGuid.PcdOptionRomImageVerificationPolicy
gUefiCpuPkgTokenSpaceGuid.PcdCpuLocalApicBaseAddress
gUefiCpuPkgTokenSpaceGuid.PcdCpuMaxLogicalProcessorNumber
gUefiCpuPkgTokenSpaceGuid.PcdCpuApInitTimeOutInMicroSeconds
|