linux-hardening - Re: [RFC PATCH v2 08/21] psci: Fix the function type for psci_initcall

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Date:   Tue, 17 May 2022 09:47:37 +0100
From:   Mark Rutland <mark.rutland@....com>
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>,
        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 v2 08/21] psci: Fix the function type for
 psci_initcall_t

On Fri, May 13, 2022 at 01:21:46PM -0700, Sami Tolvanen wrote:
> Functions called through a psci_initcall_t pointer all have
> non-const arguments. Fix the type definition to avoid tripping
> indirect call checks with CFI_CLANG.
> 
> Reported-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

I'd prefer that we spread the `const` to each of the implementations rather
than dropping it from the type.

I have a local patch for that I can send out shortly.

Thanks,
Mark.

> ---
>  drivers/firmware/psci/psci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/firmware/psci/psci.c b/drivers/firmware/psci/psci.c
> index cfb448eabdaa..6554bf4b8c99 100644
> --- a/drivers/firmware/psci/psci.c
> +++ b/drivers/firmware/psci/psci.c
> @@ -521,7 +521,7 @@ static int __init psci_probe(void)
>  	return 0;
>  }
>  
> -typedef int (*psci_initcall_t)(const struct device_node *);
> +typedef int (*psci_initcall_t)(struct device_node *);
>  
>  /*
>   * PSCI init function for PSCI versions >=0.2
> -- 
> 2.36.0.550.gb090851708-goog
>