Re: [RFC PATCH v3 15/20] objtool: Disable CFI warnings

Josh Poimboeuf
2022-06-13T16:10:45Z

On Fri, Jun 10, 2022 at 04:35:08PM -0700, Sami Tolvanen wrote:
> The __cfi_ preambles contain int3 padding and a mov instruction that
> embeds the KCFI type identifier in the following format:
>
> ; type preamble
> __cfi_function:
> int3
> int3
> mov <id>, %eax
> int3
> int3
> 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@google.com>

Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>

--
Josh