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authorStar Zeng <star.zeng@intel.com>2013-08-16 03:19:45 +0000
committerlzeng14 <lzeng14@6f19259b-4bc3-4df7-8a09-765794883524>2013-08-16 03:19:45 +0000
commit6e67fec07f7fe4033da696eb2d08c5617edaa590 (patch)
treea88242283f04d83a5d177496bcf1884270222936 /SecurityPkg/VariableAuthenticated
parent3d2f91ecdefae3e89c923c5a155b8acd0e645aec (diff)
downloadedk2-platforms-6e67fec07f7fe4033da696eb2d08c5617edaa590.tar.xz
MdeModulePkg/SecurityPkg Variable: If a preexisting variable is rewritten with different attributes, SetVariable() shall not modify the variable and shall return EFI_INVALID_PARAMETER.
Two exceptions to this rule: 1. No access attributes specified 2. The only attribute differing is EFI_VARIABLE_APPEND_WRITE Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14552 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SecurityPkg/VariableAuthenticated')
-rw-r--r--SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c
index ef123d2d5c..53ef092aff 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c
@@ -2831,6 +2831,16 @@ VariableServiceSetVariable (
Status = EFI_WRITE_PROTECTED;
goto Done;
}
+ if (Attributes != 0 && (Attributes & (~EFI_VARIABLE_APPEND_WRITE)) != Variable.CurrPtr->Attributes) {
+ //
+ // If a preexisting variable is rewritten with different attributes, SetVariable() shall not
+ // modify the variable and shall return EFI_INVALID_PARAMETER. Two exceptions to this rule:
+ // 1. No access attributes specified
+ // 2. The only attribute differing is EFI_VARIABLE_APPEND_WRITE
+ //
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
}
//