linux-kernel - Re: [netfilter-core] [PATCH v1] netfilter: x_tables: fix ordering of get and update table private

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Message-ID: <20241016163426.GD6576@breakpoint.cc>
Date: Wed, 16 Oct 2024 18:34:26 +0200
From: Florian Westphal <fw@...len.de>
To: Pablo Neira Ayuso <pablo@...filter.org>
Cc: Rongguang Wei <clementwei90@....com>, coreteam@...filter.org,
	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rongguang Wei <weirongguang@...inos.cn>, kadlec@...filter.org
Subject: Re: [netfilter-core] [PATCH v1] netfilter: x_tables: fix ordering of
 get and update table private

Pablo Neira Ayuso <pablo@...filter.org> wrote:
> On Wed, Oct 16, 2024 at 11:09:09AM +0800, Rongguang Wei wrote:
> > From: Rongguang Wei <weirongguang@...inos.cn>
> > 
> > Meet a kernel panic in ipt_do_table:
> > PANIC: "Unable to handle kernel paging request at virtual address 00706f746b736564"
> 
> This patch is no correct.

FWIW I do not understand this fix either.

I applied it and at least on x86_64 generated code is identical.
Can you show objdiff on your platform?

Maybe that gives a hint as to what is happening.