summaryrefslogtreecommitdiff
path: root/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c
diff options
context:
space:
mode:
authorlzeng14 <lzeng14@6f19259b-4bc3-4df7-8a09-765794883524>2013-04-08 06:56:08 +0000
committerlzeng14 <lzeng14@6f19259b-4bc3-4df7-8a09-765794883524>2013-04-08 06:56:08 +0000
commit3588bb3529537b2f840f4aa5dd57d65fbfef455d (patch)
tree41fdda41054b876a2d10b8cb596c156aebc9a9f7 /SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c
parent7a4d52add105b1af8d414ed7db2fc6bd94d69dcd (diff)
downloadedk2-platforms-3588bb3529537b2f840f4aa5dd57d65fbfef455d.tar.xz
If DataSize or VariableNameSize is near MAX_ADDRESS, this can cause the computed PayLoadSize to overflow to a small value and pass the check in InitCommunicateBuffer(). To protect against this vulnerability, check DataSize and VariableNameSize to make sure PayloadSize doesn't overflow.
Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14252 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c')
-rw-r--r--SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c
index a785476ff3..103a12914a 100644
--- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c
+++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/VariableSmmRuntimeDxe.c
@@ -214,6 +214,16 @@ RuntimeServiceGetVariable (
return EFI_INVALID_PARAMETER;
}
+ if (*DataSize >= mVariableBufferSize) {
+ //
+ // DataSize may be near MAX_ADDRESS incorrectly, this can cause the computed PayLoadSize to
+ // overflow to a small value and pass the check in InitCommunicateBuffer().
+ // To protect against this vulnerability, return EFI_INVALID_PARAMETER if DataSize is >= mVariableBufferSize.
+ // And there will be further check to ensure the total size is also not > mVariableBufferSize.
+ //
+ return EFI_INVALID_PARAMETER;
+ }
+
AcquireLockOnlyAtBootTime(&mVariableServicesLock);
//
@@ -291,6 +301,16 @@ RuntimeServiceGetNextVariableName (
return EFI_INVALID_PARAMETER;
}
+ if (*VariableNameSize >= mVariableBufferSize) {
+ //
+ // VariableNameSize may be near MAX_ADDRESS incorrectly, this can cause the computed PayLoadSize to
+ // overflow to a small value and pass the check in InitCommunicateBuffer().
+ // To protect against this vulnerability, return EFI_INVALID_PARAMETER if VariableNameSize is >= mVariableBufferSize.
+ // And there will be further check to ensure the total size is also not > mVariableBufferSize.
+ //
+ return EFI_INVALID_PARAMETER;
+ }
+
AcquireLockOnlyAtBootTime(&mVariableServicesLock);
//
@@ -374,6 +394,16 @@ RuntimeServiceSetVariable (
return EFI_INVALID_PARAMETER;
}
+ if (DataSize >= mVariableBufferSize) {
+ //
+ // DataSize may be near MAX_ADDRESS incorrectly, this can cause the computed PayLoadSize to
+ // overflow to a small value and pass the check in InitCommunicateBuffer().
+ // To protect against this vulnerability, return EFI_INVALID_PARAMETER if DataSize is >= mVariableBufferSize.
+ // And there will be further check to ensure the total size is also not > mVariableBufferSize.
+ //
+ return EFI_INVALID_PARAMETER;
+ }
+
AcquireLockOnlyAtBootTime(&mVariableServicesLock);
//