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Kees noted that IBT sealing could be extended to kCFI.
Fundamentally it is the list of functions that do not have their
address taken and are thus never called indirectly. It doesn't matter
that objtool uses IBT infrastructure to determine this list, once we
have it it can also be used to clobber kCFI hashes and avoid kCFI
indirect calls.
Suggested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://lkml.kernel.org/r/20230622144321.494426891%40infradead.org
9831c6253a