linux-kernel - Re: [PATCH] objtool: Detect _

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Message-ID: <CANiq72=gBYbyGG9Ty_QmA4nadG9COM+hZpvxVq5t5bBvtwva4Q@mail.gmail.com>
Date: Thu, 10 Apr 2025 21:32:35 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Paweł Anikiel <panikiel@...gle.com>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Kees Cook <kees@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Masahiro Yamada <masahiroy@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Alice Ryhl <aliceryhl@...gle.com>, 
	Nathan Chancellor <nathan@...nel.org>, x86@...nel.org, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] objtool: Detect __nocfi calls

On Thu, Apr 10, 2025 at 5:46 PM Peter Zijlstra <peterz@...radead.org> wrote:
>
> Detect and WARN about no_sanitize(kcfi) indirect calls.
>
> Apparently there were a few in some Rust 'core' that got included in the
> kernel and things went *bang*.
>
> This is not a supported form for kernel code. So detect and warn about
> it.

That was quick!

It seems to work -- I got:

      LD      vmlinux.o
    vmlinux.o: warning: objtool:
_RNvNtCs8DPF7ip8WBQ_4core3fmt5write+0x170: no-cfi indirect call!

Cheers,
Miguel