linux-kernel - Re: [PATCH v3 09/17] arm64: kprobes: fix kprobes without CONFIG

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Message-ID: <201910312055.BD31A966DB@keescook>
Date:   Thu, 31 Oct 2019 20:56:11 -0700
From:   Kees Cook <keescook@...omium.org>
To:     samitolvanen@...gle.com
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Martin <Dave.Martin@....com>,
        Laura Abbott <labbott@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        clang-built-linux@...glegroups.com,
        kernel-hardening@...ts.openwall.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 09/17] arm64: kprobes: fix kprobes without
 CONFIG_KRETPROBES

On Thu, Oct 31, 2019 at 09:46:29AM -0700, samitolvanen@...gle.com wrote:
> This allows CONFIG_KRETPROBES to be disabled without disabling
> kprobes entirely.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Is this worth folding this into the prior kprobes patch? Regardless:

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  arch/arm64/kernel/probes/kprobes.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
> index c4452827419b..98230ae979ca 100644
> --- a/arch/arm64/kernel/probes/kprobes.c
> +++ b/arch/arm64/kernel/probes/kprobes.c
> @@ -551,6 +551,7 @@ void __kprobes __used *trampoline_probe_handler(struct pt_regs *regs)
>  	return (void *)orig_ret_address;
>  }
>  
> +#ifdef CONFIG_KRETPROBES
>  void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
>  				      struct pt_regs *regs)
>  {
> @@ -564,6 +565,7 @@ int __kprobes arch_trampoline_kprobe(struct kprobe *p)
>  {
>  	return 0;
>  }
> +#endif
>  
>  int __init arch_init_kprobes(void)
>  {
> -- 
> 2.24.0.rc0.303.g954a862665-goog
> 

-- 
Kees Cook