[LTP] sockets/xfrm03: Add skb_segment SKBFL_SHARED_FRAG stripping test

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Mon, 18 May 2026 09:27:53 +0200, Andrea Cervesato wrote:
> sockets/xfrm03: Add skb_segment SKBFL_SHARED_FRAG stripping test

> +	/* Let the espintcp strparser process buffered ESP data */
> +	usleep(30000);

Sleep-based synchronisation is not allowed (G2). Replace with a
polling loop on the accepted socket or TST_CHECKPOINT_WAIT between
the child sender and the parent receiver.

[...]

> +		/*
> +		 * Splice pipe into TCP socket. On the forwarding
> +		 * path, skb_segment() may strip SKBFL_SHARED_FRAG,
> +		 * allowing in-place ESP decrypt on page cache pages.
> +		 * May fail on patched kernels.
> +		 */
> +		splice(pipefd[0], NULL, cli_fd, NULL, DATA_SIZE, 0);

SAFE_SPLICE is available in lapi/splice.h and is already used
earlier in this file. Since failure is intentionally ignored on
patched kernels, wrap with TEST() so the result is recorded without
aborting and the SAFE_* rule is satisfied.

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