[PATCH v4 16/21] objtool: Disable CFI warnings
Kees Cook
keescook at chromium.org
Wed Aug 31 11:23:34 PDT 2022
On Tue, Aug 30, 2022 at 04:31:24PM -0700, Sami Tolvanen wrote:
> The __cfi_ preambles contain a mov instruction that embeds the KCFI
> type identifier in the following format:
>
> ; type preamble
> __cfi_function:
> mov <id>, %eax
> function:
> ...
>
> While the preamble symbols are STT_FUNC and contain valid
> instructions, they are never executed and always fall through. Skip
> the warning for them.
>
> .kcfi_traps sections point to CFI traps in text sections. Also skip
> the warning about them referencing !ENDBR instructions.
>
> Signed-off-by: Sami Tolvanen <samitolvanen at google.com>
Reviewed-by: Kees Cook <keescook at chromium.org>
--
Kees Cook
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