[LTP] landlock04: Fix false TFAIL in _test_truncate() deny path

[linuxtestproject.agent@gmail.com]

Hi Avinesh,

On Mon, Aug 24, 2026, Avinesh Kumar wrote:
> landlock04: Fix false TFAIL in _test_truncate() deny path

> +	fd = exp_err ? open(FILE_TRUNCATE, O_WRONLY, PERM_MODE)
> +		     : SAFE_OPEN(FILE_TRUNCATE, O_WRONLY, PERM_MODE);
>  	if (fd != -1) {

Could the deny branch report open() errors other than EACCES? EACCES is an
expected reason to skip ftruncate() when write access is denied, but open(2)
can also fail with EMFILE, ENFILE, or ENOMEM. Those failures currently take
the same fd == -1 path, silently skip the ftruncate() assertion, and let the
variant pass without testing it.

Verdict - Needs revision

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