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Diffstat (limited to 'docs/ControlFlowIntegrity.rst')
| -rw-r--r-- | docs/ControlFlowIntegrity.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/docs/ControlFlowIntegrity.rst b/docs/ControlFlowIntegrity.rst index 04fb43a70f..12b4610f8a 100644 --- a/docs/ControlFlowIntegrity.rst +++ b/docs/ControlFlowIntegrity.rst @@ -215,6 +215,23 @@ shared library boundaries are handled as if the callee was not compiled with This scheme is currently only supported on the x86 and x86_64 architectures. +``-fsanitize-cfi-icall-generalize-pointers`` +-------------------------------------------- + +Mismatched pointer types are a common cause of cfi-icall check failures. +Translation units compiled with the ``-fsanitize-cfi-icall-generalize-pointers`` +flag relax pointer type checking for call sites in that translation unit, +applied across all functions compiled with ``-fsanitize=cfi-icall``. + +Specifically, pointers in return and argument types are treated as equivalent as +long as the qualifiers for the type they point to match. For example, ``char*`` +``char**`, and ``int*`` are considered equivalent types. However, ``char*`` and +``const char*`` are considered separate types. + +``-fsanitize-cfi-icall-generalize-pointers`` is not compatible with +``-fsanitize-cfi-cross-dso``. + + ``-fsanitize=cfi-icall`` and ``-fsanitize=function`` ---------------------------------------------------- |