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

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On Wed, 13 May 2026 17:35:03 +0200, Andrea Cervesato wrote:
> sockets/xfrm02: Add ESP-in-TCP page cache corruption test

> +		SAFE_POSIX_FADVISE(cli_fd, 0, 0, POSIX_FADV_DONTNEED);

posix_fadvise(2) is only valid for regular files; on a socket fd it
returns ESPIPE, causing SAFE_POSIX_FADVISE to call tst_brk(TBROK) in
the child and the test never actually exercises the corruption path.
Replace with SAFE_POSIX_FADVISE(file_fd, 0, DATA_SIZE, POSIX_FADV_DONTNEED).

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

Sleep-based synchronization is not allowed (G2). Use poll() on acc_fd
waiting for POLLIN to detect when the strparser has consumed the data.

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

srv_fd is not reset to -1 after close here; cleanup() will find
srv_fd != -1 and attempt a double-close, hitting TBROK on every run.
Add `srv_fd = -1;` after SAFE_CLOSE(srv_fd).

> +cve-2026-fragnesia xfrm02

Please confirm whether the fix for this CVE is in kernel 7.1 (current
stable). If not, this belongs in runtest/staging with a [STAGING]
prefix in the commit subject.

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