netdev - Re: [net-next PATCH] net: skb_find_text: Ignore patterns extending past 'to'

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Date: Mon, 16 Oct 2023 22:32:55 +0200
From: Florian Westphal <fw@...len.de>
To: Phil Sutter <phil@....cc>
Cc: David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: [net-next PATCH] net: skb_find_text: Ignore patterns extending
 past 'to'

Phil Sutter <phil@....cc> wrote:
> Assume that caller's 'to' offset really represents an upper boundary for
> the pattern search, so patterns extending past this offset are to be
> rejected.
> 
> The old behaviour also was kind of inconsistent when it comes to
> fragmentation (or otherwise non-linear skbs): If the pattern started in
> between 'to' and 'from' offsets but extended to the next fragment, it
> was not found if 'to' offset was still within the current fragment.
> 
> Test the new behaviour in a kselftest using iptables' string match.
> 
> Suggested-by: Pablo Neira Ayuso <pablo@...filter.org>
> Fixes: f72b948dcbb85 ("[NET]: skb_find_text ignores to argument")

FYI, checkpatch complains about the fixes tag.

> diff --git a/tools/testing/selftests/netfilter/xt_string.sh b/tools/testing/selftests/netfilter/xt_string.sh
> new file mode 100755
> index 0000000000000..1802653a47287
> --- /dev/null
> +++ b/tools/testing/selftests/netfilter/xt_string.sh

Thanks for the test case. Is there a reason why its not hooked
up to the kselftest makefile?

I think it should be.