linux-kernel - Re: [PATCH linux-next v3 05/14] crash: clean up kdump related config items

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: <Zsfs2VhE0lTY2tpO@MiWiFi-R3L-srv>
Date: Fri, 23 Aug 2024 09:58:49 +0800
From: Baoquan He <bhe@...hat.com>
To: Dave Vasilevsky <dave@...ilevsky.ca>
Cc: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	linux-kernel@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
	kexec@...ts.infradead.org, debian-powerpc@...ts.debian.org,
	x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-mips@...r.kernel.org,
	linux-riscv@...ts.infradead.org, loongarch@...ts.linux.dev,
	akpm@...ux-foundation.org, ebiederm@...ssion.com,
	hbathini@...ux.ibm.com, piliu@...hat.com, viro@...iv.linux.org.uk,
	Sam James <sam@...too.org>
Subject: Re: [PATCH linux-next v3 05/14] crash: clean up kdump related config
 items

On 08/22/24 at 08:41pm, Dave Vasilevsky wrote:
> On 2024-08-22 20:04, Baoquan He wrote:
> > If so, below patch possiblly can fix it. Can you help check if it's OK?
> 
> That removes the possibility of enabling CRASH_DUMP on PPC_BOOK3S_32, even when booting via other mechanisms. Maybe it would be best to just make it not-default? Please take a look at this patch:
> 

This is a good mimic of ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG and the
correspondent KEXEC_IMAGE_VERIFY_SIG. It looks good to me, as long as no
one complain we introduce too many knobs.

Can you post this formally so that people can review it?

> 
> From d6e5fe3a45f46f1aa01914648c443291d956de9e Mon Sep 17 00:00:00 2001
> From: Dave Vasilevsky <dave@...ilevsky.ca>
> Date: Thu, 22 Aug 2024 20:13:46 -0400
> Subject: [PATCH] powerpc: Default to CRASH_DUMP=n when Open Firmware boot is
>  likely
> MIME-Version: 1.0
> Content-Type: text/plain; charset=UTF-8
> Content-Transfer-Encoding: 8bit
> 
> Open Firmware is unable to boot a kernel where PHYSICAL_START is
> non-zero, which occurs when CRASH_DUMP is on.
> 
> On PPC_BOOK3S_32, the most common way of booting is Open Firmware, so
> most users probably don't want CRASH_DUMP. Users booting via some
> other mechanism can turn it on explicitly.
> 
> Signed-off-by: Dave Vasilevsky <dave@...ilevsky.ca>
> Reported-by: Reimar Döffinger <Reimar.Doeffinger@....de>
> Fixes: 75bc255a7444
> ---
>  arch/arm/Kconfig       | 3 +++
>  arch/arm64/Kconfig     | 3 +++
>  arch/loongarch/Kconfig | 3 +++
>  arch/mips/Kconfig      | 3 +++
>  arch/powerpc/Kconfig   | 4 ++++
>  arch/riscv/Kconfig     | 3 +++
>  arch/s390/Kconfig      | 3 +++
>  arch/sh/Kconfig        | 3 +++
>  arch/x86/Kconfig       | 3 +++
>  kernel/Kconfig.kexec   | 2 +-
>  10 files changed, 29 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 54b2bb817a7f..200995052690 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -1597,6 +1597,9 @@ config ATAGS_PROC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config AUTO_ZRELADDR
>  	bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM
>  	default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100)
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index a2f8ff354ca6..43e08cc8204f 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1558,6 +1558,9 @@ config ARCH_DEFAULT_KEXEC_IMAGE_VERIFY_SIG
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
>  	def_bool CRASH_RESERVE
>  
> diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
> index 70f169210b52..ce232ddcd27d 100644
> --- a/arch/loongarch/Kconfig
> +++ b/arch/loongarch/Kconfig
> @@ -599,6 +599,9 @@ config ARCH_SUPPORTS_KEXEC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_SELECTS_CRASH_DUMP
>  	def_bool y
>  	depends on CRASH_DUMP
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 60077e576935..b547f4304d0c 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -2881,6 +2881,9 @@ config ARCH_SUPPORTS_KEXEC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config PHYSICAL_START
>  	hex "Physical address where the kernel is loaded"
>  	default "0xffffffff84000000"
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index d7b09b064a8a..0f3c1f958eac 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -682,6 +682,10 @@ config RELOCATABLE_TEST
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool PPC64 || PPC_BOOK3S_32 || PPC_85xx || (44x && !SMP)
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	bool
> +	default y if !PPC_BOOK3S_32
> +
>  config ARCH_SELECTS_CRASH_DUMP
>  	def_bool y
>  	depends on CRASH_DUMP
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 0f3cd7c3a436..eb247b5ee569 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -880,6 +880,9 @@ config ARCH_SUPPORTS_KEXEC_PURGATORY
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool y
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
>  	def_bool CRASH_RESERVE
>  
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index a822f952f64a..05a1fb408471 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -275,6 +275,9 @@ config ARCH_SUPPORTS_CRASH_DUMP
>  	  This option also enables s390 zfcpdump.
>  	  See also <file:Documentation/arch/s390/zfcpdump.rst>
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  menu "Processor type and features"
>  
>  config HAVE_MARCH_Z10_FEATURES
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 1aa3c4a0c5b2..3a6338962636 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -549,6 +549,9 @@ config ARCH_SUPPORTS_KEXEC
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool BROKEN_ON_SMP
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_SUPPORTS_KEXEC_JUMP
>  	def_bool y
>  
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 007bab9f2a0e..aa4666bb9e9c 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2087,6 +2087,9 @@ config ARCH_SUPPORTS_KEXEC_JUMP
>  config ARCH_SUPPORTS_CRASH_DUMP
>  	def_bool X86_64 || (X86_32 && HIGHMEM)
>  
> +config ARCH_DEFAULT_CRASH_DUMP
> +	def_bool y
> +
>  config ARCH_SUPPORTS_CRASH_HOTPLUG
>  	def_bool y
>  
> diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
> index 6c34e63c88ff..4d111f871951 100644
> --- a/kernel/Kconfig.kexec
> +++ b/kernel/Kconfig.kexec
> @@ -97,7 +97,7 @@ config KEXEC_JUMP
>  
>  config CRASH_DUMP
>  	bool "kernel crash dumps"
> -	default y
> +	default ARCH_DEFAULT_CRASH_DUMP
>  	depends on ARCH_SUPPORTS_CRASH_DUMP
>  	depends on KEXEC_CORE
>  	select VMCORE_INFO
> -- 
> 2.34.1
>