linux-kernel - RE: [PATCH v13 11/11] arm64: Select HAVE_RELIABLE

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Date:   Tue, 25 Jan 2022 05:21:27 +0000
From:   "nobuta.keiya@...itsu.com" <nobuta.keiya@...itsu.com>
To:     "'madvenka@...ux.microsoft.com'" <madvenka@...ux.microsoft.com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "ardb@...nel.org" <ardb@...nel.org>,
        "sjitindarsingh@...il.com" <sjitindarsingh@...il.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "jmorris@...ei.org" <jmorris@...ei.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v13 11/11] arm64: Select HAVE_RELIABLE_STACKTRACE

Hi Madhavan,

> Select HAVE_RELIABLE_STACKTRACE in arm64/Kconfig to allow
> arch_stack_walk_reliable() to be used.
> 
> Note that this is conditional upon STACK_VALIDATION which will be added when frame pointer validation is implemented (say
> via objtool).

I know that Julien Thierry published objtool support for arm64 [1], but I'm not
sure if it has been updated. Could you tell me other threads if you know?

[1] https://lore.kernel.org/linux-arm-kernel/20210303170932.1838634-1-jthierry@redhat.com/


Thanks,
Keiya

> 
> Signed-off-by: Madhavan T. Venkataraman <madvenka@...ux.microsoft.com>
> ---
>  arch/arm64/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index f6e333b59314..bc7b3514b563 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -223,6 +223,7 @@ config ARM64
>  	select THREAD_INFO_IN_TASK
>  	select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
>  	select TRACE_IRQFLAGS_SUPPORT
> +	select HAVE_RELIABLE_STACKTRACE if FRAME_POINTER && STACK_VALIDATION
>  	help
>  	  ARM 64-bit (AArch64) Linux support.
> 
> --
> 2.25.1