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

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On 2026-05-13, Andrea Cervesato wrote:
> sockets/xfrm02: Add ESP-in-TCP page cache corruption test

> +	acc_fd = SAFE_ACCEPT(srv_fd, NULL, NULL);
> +	SAFE_CLOSE(srv_fd);

srv_fd is not reset to -1 after this close. cleanup() checks
`srv_fd != -1` and will double-close the stale descriptor. Add
`srv_fd = -1;` here.

> +	file_fd = SAFE_OPEN(TESTFILE, O_WRONLY | O_CREAT, 0444);
> +	SAFE_WRITE(SAFE_WRITE_ALL, file_fd, original, DATA_SIZE);
> +	SAFE_CLOSE(file_fd);
[...]
> +	SAFE_CLOSE(file_fd);
[...]
> +	SAFE_CLOSE(file_fd);

Same problem for file_fd: none of the three SAFE_CLOSE calls in run()
reset file_fd to -1, so cleanup() will double-close it. Add
`file_fd = -1;` after each one.

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

SAFE_SPLICE exists. If failure on patched kernels must be tolerated,
capture the return in a local variable and add a comment explaining
why the error is intentionally ignored.

---
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