[LTP] fs/acl: Add ACL_USER_OBJ permission test

[linuxtestproject.agent@gmail.com]

Hi Sachin,

On Fri, 12 Jun 2026 15:54:55 +0530, Sachin Sant wrote:
> fs/acl: Add ACL_USER_OBJ permission test

--- [PATCH 1/8] ---

> +	SAFE_SETGROUPS(0, NULL);
> +
> +	if (setresgid(gid, gid, gid) < 0)
> +		tst_brk(TBROK | TERRNO, "setresgid(%u) failed",
> +			(unsigned int)gid);
> +
> +	if (setresuid(uid, uid, uid) < 0)
> +		tst_brk(TBROK | TERRNO, "setresuid(%u) failed",
> +			(unsigned int)uid);

SAFE_SETRESGID() and SAFE_SETRESUID() exist in
include/tst_safe_macros.h. Since SAFE_SETGROUPS() is already
used on the line above, could these be switched to the SAFE_
variants as well?

> +		if (exp_errno) {
> +			TST_EXP_FAIL(open(TESTFILE, O_CREAT | O_WRONLY, mode),
> +				     exp_errno, "open(%s)", TESTFILE);

open() returns a positive file descriptor on success, not 0.
TST_EXP_FAIL2 should be used here instead of TST_EXP_FAIL.

With TST_EXP_FAIL the PASS_COND is TST_RET == 0, so if open()
unexpectedly succeeds with e.g. fd 5, the macro falls through
to the "invalid retval" branch instead of reporting "succeeded".

Verdict: Needs revision

---
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