linux-kernel - Re: [PATCH v4 06/11] s390/module: Use s390_kernel

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Date:   Thu, 7 May 2020 12:00:13 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Jessica Yu <jeyu@...nel.org>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>, linux-s390@...r.kernel.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Gerald Schaefer <gerald.schaefer@...ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v4 06/11] s390/module: Use s390_kernel_write() for late
 relocations

On Wed, 29 Apr 2020, Josh Poimboeuf wrote:

> From: Peter Zijlstra <peterz@...radead.org>
> 
> Because of late module patching, a livepatch module needs to be able to
> apply some of its relocations well after it has been loaded.  Instead of
> playing games with module_{dis,en}able_ro(), use existing text poking
> mechanisms to apply relocations after module loading.
> 
> So far only x86, s390 and Power have HAVE_LIVEPATCH but only the first
> two also have STRICT_MODULE_RWX.
> 
> This will allow removal of the last module_disable_ro() usage in
> livepatch.  The ultimate goal is to completely disallow making
> executable mappings writable.
> 
> [ jpoimboe: Split up patches.  Use mod state to determine whether
> 	    memcpy() can be used.  Test and add fixes. ]
> 
> Cc: linux-s390@...r.kernel.org
> Cc: Heiko Carstens <heiko.carstens@...ibm.com>
> Cc: Gerald Schaefer <gerald.schaefer@...ibm.com>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Acked-by: Joe Lawrence <joe.lawrence@...hat.com>
> Acked-by: Miroslav Benes <mbenes@...e.cz>

Could we please get an Ack / Reviewed-by: for this patch from s390 folks?

Thanks,

-- 
Jiri Kosina
SUSE Labs