There are various issues regarding DebugImageInfoTable:
1) Interrupting the table updates (e.g. an exception occured) may
leave the table in an inconsistent state.
2) Deleting an entry from the table may hide a different entry.
3) The type of image entries is not checked before accessing them as
NormalImage. This is practically safe now, because there is only one
type, but it adding more types would cause the accesses to
potentially invoke Undefined Behaviour.
4) The guarantees the table gives are not clear. For example, the
LoadedImage protocol instance can never be NULL (and wouldn't make
sense to be either), yet it is checked in some places, but not in
others.
This patch series addresses all of these issues.
Marvin Häuser (7):
MdeModulePkg/DxeCore: Consistent DebugImageInfoTable updates
MdeModulePkg/DxeCore: Fix DebugImageInfoTable size report
EmbeddedPkg/GdbStub: Check DebugImageInfoTable type safely
ArmPkg/DefaultExceptionHandlerLib: Check DebugImageInfoTable type
safely
MdeModulePkg/CoreDxe: Mandatory LoadedImage for DebugImageInfoTable
EmbeddedPkg/GdbStub: Mandatory LoadedImage for DebugImageInfoTable
ArmPkg/DefaultExceptionHandlerLib: Mandatory LoadedImage for
DebugImageInfoTable
ArmPkg/Library/DefaultExceptionHandlerLib/DefaultExceptionHandlerUefi.c | 7 +-
EmbeddedPkg/GdbStub/GdbStub.c | 7 +-
MdeModulePkg/Core/Dxe/Misc/DebugImageInfo.c | 82
+++++++++++++-------
3 files changed, 60 insertions(+), 36 deletions(-)
--
2.31.1
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