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Date: Wed, 31 Aug 2022 11:23:34 -0700 From: Kees Cook <keescook@...omium.org> To: Sami Tolvanen <samitolvanen@...gle.com> Cc: linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>, Peter Zijlstra <peterz@...radead.org>, x86@...nel.org, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Joao Moreira <joao@...rdrivepizza.com>, Sedat Dilek <sedat.dilek@...il.com>, Steven Rostedt <rostedt@...dmis.org>, linux-hardening@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev Subject: Re: [PATCH v4 16/21] objtool: Disable CFI warnings 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@...gle.com> Reviewed-by: Kees Cook <keescook@...omium.org> -- Kees Cook
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