linux-kernel - Re: [PATCH 3/3] s390/Kconfig: drop select of KEXEC

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]

Date:   Thu, 23 Nov 2023 22:31:59 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        akpm@...ux-foundation.org, ignat@...udflare.com,
        eric_devolder@...oo.com
Subject: Re: [PATCH 3/3] s390/Kconfig: drop select of KEXEC

On 11/23/23 at 02:43pm, Alexander Gordeev wrote:
> On Thu, Nov 23, 2023 at 03:36:52PM +0800, Baoquan He wrote:
> 
> Hi Baoquan,
> 
> > No proof is found to require that S390 architecture has to select
> > KEXEC. At least from my testing at below, dropping select of KEXEC won't
> > impact anything.
> 
> It does impact the outcome of defconfigs.
> Namely, CONFIG_KEXEC is not set with this patch.

Right, CONFIG_KEXEC won't be set defaultly with this patch applied.

> 
> > ===testing 1===
> > CONFIG_CRASH_CORE=y
> > CONFIG_KEXEC_CORE=y
> > CONFIG_CRASH_DUMP=y
> > ===
> > 
> > ===testing 2===
> > CONFIG_CRASH_CORE=y
> > CONFIG_KEXEC_CORE=y
> > CONFIG_KEXEC_FILE=y
> > CONFIG_CRASH_DUMP=y
> > ===
> 
> Unfortunately, I do not quite realize what these testings were
> and what is the difference between the two.

Both these two testings have CONFIG_KEXEC=n, and building all passed.
I wound't present their difference, but two cases where no CONFIG_KEXEC
is set and no dependency on CONFIG_KEXEC is seen.

> 
> > So drop the select of KEXEC now.
> 
> I suggest dropping this patch. Once the previous two are upstream
> we would remove 'select KEXEC' from Kconfig together with defconfig
> updates.

I see your concern, will drop this one in v2. Thanks for checking these.

> 
> > Signed-off-by: Baoquan He <bhe@...hat.com>
> > ---
> >  arch/s390/Kconfig | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> > index 3bec98d20283..1aec2e692dca 100644
> > --- a/arch/s390/Kconfig
> > +++ b/arch/s390/Kconfig
> > @@ -217,7 +217,6 @@ config S390
> >  	select HAVE_VIRT_CPU_ACCOUNTING_IDLE
> >  	select IOMMU_HELPER		if PCI
> >  	select IOMMU_SUPPORT		if PCI
> > -	select KEXEC
> >  	select MMU_GATHER_MERGE_VMAS
> >  	select MMU_GATHER_NO_GATHER
> >  	select MMU_GATHER_RCU_TABLE_FREE
> > -- 
> 
> Thanks!
>