[LTP] [PATCH v2] cve: add CVE-2025-38236 test

[Petr Vorel]

Hi Andrea,

Reviewed-by: Petr Vorel <pvorel@suse.cz>
Tested-by: Petr Vorel <pvorel@suse.cz>

> Changes in v2:
> - use MSG_DONTWAIT
> - add reference in the description
> - reduce if/else nesting
> - use different data for send()
> - Link to v1: https://lore.kernel.org/r/20250812-cve_2025_38236-v1-1-e3617ada69c6@suse.com
+1

...
> +	ret = recv(sock[0], &dummy, 1, MSG_DONTWAIT);
> +	if (ret == -1) {
> +		if (errno == EWOULDBLOCK) {
> +			tst_res(TPASS, "Can't read out-of-band data from normal stream");
> +			return;
> +		}
> +
> +		tst_brk(TBROK | TERRNO, "recv error");
> +		return;
nit: this return is not needed (can be removed before merge).
We have compilers smart enough to know that tst_brk() quits,
although there might be a warning on oldest supported toolchains.

Kind regards,
Petr

> +	}
...