[LTP] sockets/xfrm02: Add ESP-in-TCP page cache corruption test

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Wed, 13 May 2026, Andrea Cervesato wrote:
> sockets/xfrm02: Add ESP-in-TCP page cache corruption test

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

Sleep-based synchronization is not allowed. Use an event-based mechanism
(e.g. poll the accepted socket for readability) instead of a fixed sleep.

[...]

> +		splice(pipefd[0], NULL, cli_fd, NULL, DATA_SIZE, 0);

SAFE_SPLICE() exists; use it, or wrap in TEST() if failure on patched kernels
is expected. The return value must not be silently discarded.

[...]

> +static int srv_fd = -1;
[...]
> +	SAFE_CLOSE(srv_fd);
[...]
> +	if (srv_fd != -1)
> +		SAFE_CLOSE(srv_fd);

srv_fd and file_fd are closed inside try_corrupt()/run() but never reset to
-1, so cleanup() calls SAFE_CLOSE() on already-closed fds (EBADF). Assign -1
after each SAFE_CLOSE() on these globals.

---
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