diff options
| author | czhang46 <czhang46@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-04-19 01:35:02 +0000 |
|---|---|---|
| committer | czhang46 <czhang46@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-04-19 01:35:02 +0000 |
| commit | d17c4eac5625e40fa3715aee14286f45797b3999 (patch) | |
| tree | e3d63989c9de98b36143d61c529d107f51a47963 /MdeModulePkg | |
| parent | 0290177adf73b36bc76f888e861da5c15e21d5d4 (diff) | |
| download | edk2-platforms-d17c4eac5625e40fa3715aee14286f45797b3999.tar.xz | |
Fix a potential SMM memory dump issue. If pass communication buffer with DataBuffer to SMM SetVariable which is big enough to cover SMM range. Then GetVariable can dump SMM memory contents. Add more range check for SetVariable
Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by : Dong Guo <guo.dong@intel.com>
Reviewed-by : Jiewen Yao <jiewen.yao@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14292 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg')
| -rw-r--r-- | MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c index 550f01a525..7541f6ae1d 100644 --- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c +++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.c @@ -482,6 +482,19 @@ SmmVariableHandler ( case SMM_VARIABLE_FUNCTION_SET_VARIABLE:
SmmVariableHeader = (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE *) SmmVariableFunctionHeader->Data;
+ InfoSize = OFFSET_OF(SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name)
+ + SmmVariableHeader->DataSize + SmmVariableHeader->NameSize;
+
+ //
+ // SMRAM range check already covered before
+ // Data buffer should not contain SMM range
+ //
+ if (InfoSize > *CommBufferSize - SMM_VARIABLE_COMMUNICATE_HEADER_SIZE) {
+ DEBUG ((EFI_D_ERROR, "Data size exceed communication buffer size limit!\n"));
+ Status = EFI_ACCESS_DENIED;
+ goto EXIT;
+ }
+
Status = VariableServiceSetVariable (
SmmVariableHeader->Name,
&SmmVariableHeader->Guid,
|