netdev - Re: [PATCH net-next] net: Implement fault injection forcing skb reallocation

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Message-ID: <20241002152540.51408-1-kuniyu@amazon.com>
Date: Wed, 2 Oct 2024 08:25:40 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <leitao@...ian.org>
CC: <akinobu.mita@...il.com>, <aleksander.lobakin@...el.com>,
	<almasrymina@...gle.com>, <asml.silence@...il.com>, <corbet@....net>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <horms@...nel.org>,
	<kuba@...nel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<pabeni@...hat.com>, <willemb@...gle.com>, <kuniyu@...zon.com>
Subject: Re: [PATCH net-next] net: Implement fault injection forcing skb reallocation

From: Breno Leitao <leitao@...ian.org>
Date: Wed,  2 Oct 2024 04:32:54 -0700
> diff --git a/net/Kconfig.debug b/net/Kconfig.debug
> index 5e3fffe707dd..f61935e028bd 100644
> --- a/net/Kconfig.debug
> +++ b/net/Kconfig.debug

This config is networking-specific, but I think lib/Kconfig.debug would be
a better fit as other fault injection configs are placed there together.

Now we need to enable fault injection first and go back to the net-specific
items in menuconfig.


> @@ -24,3 +24,14 @@ config DEBUG_NET
>  	help
>  	  Enable extra sanity checks in networking.
>  	  This is mostly used by fuzzers, but is safe to select.
> +
> +config FAIL_SKB_FORCE_REALLOC
> +	bool "Fault-injection capability forcing skb to reallocate"
> +	depends on FAULT_INJECTION && DEBUG_NET
> +	default n
> +	help
> +	  Provide fault-injection capability that forces the skb to be
> +	  reallocated, caughting possible invalid pointers to the skb.
> +
> +	  For more information, check
> +	  Documentation/dev-tools/fault-injection/fault-injection.rst