Re: [edk2-devel] [PATCH v1 1/1] UefiCpuPkg: PiSmmCpuDxeSmm: Check buffer size before accessing

["Laszlo Ersek" <lersek@redhat.com>]

On 04/07/21 18:08, Laszlo Ersek wrote:
> On 04/06/21 21:52, Kun Qin wrote:
>> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3283
>>
>> Current SMM Save State routine does not check the number of bytes to be
>> read, when it comse to read IO_INFO, before casting the incoming buffer
>> to EFI_SMM_SAVE_STATE_IO_INFO. This could potentially cause memory
>> corruption due to extra bytes are written out of buffer boundary.
>>
>> This change adds a width check before copying IoInfo into output buffer.
>>
>> Cc: Eric Dong <eric.dong@intel.com>
>> Cc: Ray Ni <ray.ni@intel.com>
>> Cc: Laszlo Ersek <lersek@redhat.com>
>> Cc: Rahul Kumar <rahul1.kumar@intel.com>
>>
>> Signed-off-by: Kun Qin <kuqin12@gmail.com>
>> Reviewed-by: Ray Ni <ray.ni@intel.com>
>> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
>> ---
>>
>> Notes:
>>     v2:
>>     - Update return code description [Laszlo]
>>
>>  UefiCpuPkg/PiSmmCpuDxeSmm/SmramSaveState.c | 9 ++++++++-
>>  UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h | 2 +-
>>  2 files changed, 9 insertions(+), 2 deletions(-)
> 
> Thanks, looks OK. I'll let Ray or Eric merge the patch.

:/

Merged as commit a7d8e28b29f2, via
<https://github.com/tianocore/edk2/pull/1554>.

Laszlo