diff options
| author | lzeng14 <lzeng14@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-04-08 06:56:08 +0000 |
|---|---|---|
| committer | lzeng14 <lzeng14@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-04-08 06:56:08 +0000 |
| commit | 3588bb3529537b2f840f4aa5dd57d65fbfef455d (patch) | |
| tree | 41fdda41054b876a2d10b8cb596c156aebc9a9f7 /SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c | |
| parent | 7a4d52add105b1af8d414ed7db2fc6bd94d69dcd (diff) | |
| download | edk2-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/Variable.c')
| -rw-r--r-- | SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c index 10915e45b0..1595c8c206 100644 --- a/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c +++ b/SecurityPkg/VariableAuthenticated/RuntimeDxe/Variable.c @@ -3224,6 +3224,11 @@ VariableCommonInitialize ( ASSERT(VariableStoreHeader->Size == VariableStoreLength);
//
+ // The max variable or hardware error variable size should be < variable store size.
+ //
+ ASSERT(MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize)) < VariableStoreLength);
+
+ //
// Parse non-volatile variable data and get last variable offset.
//
NextVariable = GetStartPointer ((VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase);
|