mirror of https://github.com/acidanthera/audk.git
47343af304
The DXE Core sets up a protocol notify function in its entry point, for
instances of the Firmware Volume Block2 Protocol:
DxeMain() [DxeMain/DxeMain.c]
FwVolDriverInit() [FwVol/FwVol.c]
Assume that a 3rd party UEFI driver or application installs an FVB
instance, with crafted contents. The notification function runs:
NotifyFwVolBlock() [FwVol/FwVol.c]
installing an instance of the Firmware Volume 2 Protocol on the handle.
(Alternatively, assume that a 3rd party application calls
gDS->ProcessFirmwareVolume(), which may also produce a Firmware Volume 2
Protocol instance.)
The EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() member performs "a
depth-first, left-to-right search algorithm through all sections found in
the specified file" (quoting the PI spec), as follows:
FvReadFileSection() [FwVol/FwVolRead.c]
GetSection() [SectionExtraction/CoreSectionExtraction.c]
FindChildNode() [SectionExtraction/CoreSectionExtraction.c]
FindChildNode() // recursive call
FindChildNode() is called recursively for encapsulation sections.
Currently this recursion is not limited. Introduce a new PCD
(fixed-at-build, or patchable-in-module), and make FindChildNode() track
the section nesting depth against that PCD.
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1743
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20201119105340.16225-3-lersek@redhat.com>
|
||
|---|---|---|
| .. | ||
| Dispatcher | ||
| DxeMain | ||
| Event | ||
| FwVol | ||
| FwVolBlock | ||
| Gcd | ||
| Hand | ||
| Image | ||
| Library | ||
| Mem | ||
| Misc | ||
| SectionExtraction | ||
| DxeCore.uni | ||
| DxeCoreExtra.uni | ||
| DxeMain.h | ||
| DxeMain.inf | ||