linux-kernel - Re: [PATCH] riscv: Require FRAME_POINTER for some configurations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <23368823-0377-00c0-28a1-e804e3a2acac@infradead.org>
Date:   Wed, 23 Aug 2023 08:34:04 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Björn Töpel <bjorn@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org
Cc:     Björn Töpel <bjorn@...osinc.com>,
        linux-kernel@...r.kernel.org, Guo Ren <guoren@...nel.org>,
        Drew Fustini <dfustini@...libre.com>,
        linux-next@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] riscv: Require FRAME_POINTER for some configurations


Hi,

On 8/23/23 01:28, Björn Töpel wrote:
> From: Björn Töpel <bjorn@...osinc.com>
> 
> Some V configurations implicitly turn on '-fno-omit-frame-pointer',
> but leaving FRAME_POINTER disabled. This makes it hard to reason about
> the FRAME_POINTER config, and also triggers build failures introduced
> in by the commit in the Fixes: tag.
> 
> Select FRAME_POINTER explicitly for these configurations.
> 
> Fixes: ebc9cb03b21e ("riscv: stack: Fixup independent softirq stack for CONFIG_FRAME_POINTER=n")
> Signed-off-by: Björn Töpel <bjorn@...osinc.com>

WorksForMe. Thanks.

Tested-by: Randy Dunlap <rdunlap@...radead.org>
Acked-by: Randy Dunlap <rdunlap@...radead.org>

> ---
>  arch/riscv/Kconfig  | 1 +
>  arch/riscv/Makefile | 3 ---
>  2 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 10e7a7ad175a..cd8075c092c3 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -62,6 +62,7 @@ config RISCV
>  	select COMMON_CLK
>  	select CPU_PM if CPU_IDLE || HIBERNATION
>  	select EDAC_SUPPORT
> +	select FRAME_POINTER if PERF_EVENTS || (FUNCTION_TRACER && !DYNAMIC_FTRACE)
>  	select GENERIC_ARCH_TOPOLOGY
>  	select GENERIC_ATOMIC64 if !64BIT
>  	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
> diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
> index 6ec6d52a4180..1329e060c548 100644
> --- a/arch/riscv/Makefile
> +++ b/arch/riscv/Makefile
> @@ -87,9 +87,6 @@ endif
>  ifeq ($(CONFIG_CMODEL_MEDANY),y)
>  	KBUILD_CFLAGS += -mcmodel=medany
>  endif
> -ifeq ($(CONFIG_PERF_EVENTS),y)
> -        KBUILD_CFLAGS += -fno-omit-frame-pointer
> -endif
>  
>  # Avoid generating .eh_frame sections.
>  KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables
> 
> base-commit: 89bf6209cad66214d3774dac86b6bbf2aec6a30d

-- 
~Randy