[edk2-devel] [PATCH 2/5] MdeModulePkg/SecurityLockAuditDebugLib: Add lib instance
Laszlo Ersek
lersek at redhat.com
Mon Jul 22 20:34:00 UTC 2019
On 07/22/19 06:02, Gao, Zhichao wrote:
> From: Bret Barkelew <Bret.Barkelew at microsoft.com>
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2006
>
> Add the instance of SecurityLockAuditLib. This instance
> has one interface SecurityLockReportEvent to log hardware
> and software security locks info.
>
> Cc: Jian J Wang <jian.j.wang at intel.com>
> Cc: Hao A Wu <hao.a.wu at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Star Zeng <star.zeng at intel.com>
> Cc: Liming gao <liming.gao at intel.com>
> Cc: Sean Brogan <sean.brogan at microsoft.com>
> Cc: Michael Turner <Michael.Turner at microsoft.com>
> Cc: Bret Barkelew <Bret.Barkelew at microsoft.com>
> Signed-off-by: Zhichao Gao <zhichao.gao at intel.com>
> ---
> .../SecurityLockAuditDebugLib.c | 53 +++++++++++++++++++
> .../SecurityLockAuditDebugLib.inf | 29 ++++++++++
> 2 files changed, 82 insertions(+)
> create mode 100644 MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.c
> create mode 100644 MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.inf
>
> diff --git a/MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.c b/MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.c
> new file mode 100644
> index 0000000000..c1872bc023
> --- /dev/null
> +++ b/MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.c
> @@ -0,0 +1,53 @@
> +/** @file
> + This library implements the necessary functions
> + to log hardware and software security locks for post-processing
> +
> + Copyright (c) 2018, Microsoft Corporation
> +
> + SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#include <Base.h>
> +#include <Library/SecurityLockAuditLib.h>
> +#include <Library/DebugLib.h>
> +
> +//
> +// Used to look up lock name from LOCK_TYPE enum
> +//
> +CHAR8* mLockName[] = {
> + "SOFTWARE_LOCK",
> + "HARDWARE_LOCK"
> +};
> +
> +
> +/**
> + Function for security Lock event logging and reporting
> +
> + @param[in] Module GUID of calling module
> + @param[in] Function Name of calling function
> + @param[in] LockEventText Debug message explaining what is locked
> + @param[in] LockType Enumerated lock type for differentiation
> +
> +**/
> +VOID
> +EFIAPI
> +SecurityLockReportEvent (
> + IN GUID *Module,
> + IN CONST CHAR8 *Function,
> + IN CONST CHAR8 *LockEventText,
> + IN LOCK_TYPE LockType
> + )
> +{
> + UINTN LockTypeIndex;
> + UINTN LockNameCount;
> +
> + LockTypeIndex = (UINTN)LockType;
> + LockNameCount = sizeof (mLockName) / sizeof (mLockName[0]);
> +
> + if (LockTypeIndex < LockNameCount) {
> + DEBUG ((DEBUG_ERROR, "SecurityLock::LockType: %a, Module: %g, Function: %a, Output: %a\n", mLockName[LockTypeIndex], Module, Function, LockEventText));
> + } else {
> + DEBUG ((DEBUG_ERROR, "SecurityLock::LockType: %d, Module: %g, Function: %a, Output: %a\n", LockType, Module, Function, LockEventText));
> + }
> +}
I disagree with this implementation. Security log messages are
important, but they are not necessarily errors. DEBUG_ERROR should be
used for errors, preferably for such that cannot be recovered from
(DEBUG_WARN is OK for recoverable errors).
If DEBUG_INFO is deemed too "quiet" for logging security events, then we
should introduce a new bit value for the debug bitmask, such as
DEBUG_SECURITY. We have a number of "special purpose" bits already:
- DEBUG_LOAD
- DEBUG_FS
- DEBUG_POOL
- DEBUG_PAGE
- DEBUG_DISPATCH
- etc
and I think we have room for DEBUG_SECURITY.
(1) And then, the log mask in this library instance should be
DEBUG_SECURITY | DEBUG_INFO
I believe.
Thanks
Laszlo
> diff --git a/MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.inf b/MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.inf
> new file mode 100644
> index 0000000000..b641016087
> --- /dev/null
> +++ b/MdeModulePkg/Library/SecurityLockAuditDebugLib/SecurityLockAuditDebugLib.inf
> @@ -0,0 +1,29 @@
> +## @file
> +#
> +# Library that implements logging and reporting for security locks
> +# Using DebugLib
> +#
> +#
> +# Copyright (c) 2018, Microsoft Corporation
> +#
> +# SPDX-License-Identifier: BSD-2-Clause-Patent
> +##
> +
> +[Defines]
> + INF_VERSION = 0x00010005
> + BASE_NAME = SecurityLockAuditDebugLib
> + FILE_GUID = 459d0456-d6be-458e-9cc8-e9b21745f9aa
> + MODULE_TYPE = BASE
> + VERSION_STRING = 1.0
> + LIBRARY_CLASS = SecurityLockAuditLib
> +
> +[Sources.common]
> + SecurityLockAuditDebugLib.c
> +
> +[Packages]
> + MdePkg/MdePkg.dec
> + MdeModulePkg/MdeModulePkg.dec
> +
> +[LibraryClasses]
> + BaseLib
> + DebugLib
>
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