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Date: Mon, 13 Jun 2022 09:10:43 -0700 From: Josh Poimboeuf <jpoimboe@...nel.org> To: Sami Tolvanen <samitolvanen@...gle.com> Cc: linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.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: [RFC PATCH v3 15/20] objtool: Disable CFI warnings 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@...gle.com> Acked-by: Josh Poimboeuf <jpoimboe@...nel.org> -- Josh
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