[LTP] shmctl03: Fix shmmax clamped to INT_MAX in 32bit compat mode

[linuxtestproject.agent@gmail.com]

Hi Petr,

On Fri, 25 Sep 2026 10:28:39 +0200, Petr Vorel wrote:
> [PATCH 1/2] shmctl03: Fix shmmax clamped to INT_MAX in 32bit compat mode

--- [PATCH 1/2] ---

> +	SAFE_FILE_SCANF(PATH_KERN_SHMMAX, "%lu", &shmmax);
> +	if (tst_is_compat_mode() && info.shmmax == INT_MAX)
> +		TST_EXP_LE_LU(INT_MAX, shmmax);
> +	else
> +		TST_EXP_EQ_LU(info.shmmax, shmmax);

Testing `info.shmmax == INT_MAX` in the condition masks regressions; if the
kernel fails to clamp `info.shmmax`, execution takes the else branch and
reports TPASS. Additionally, `TST_EXP_LE_LU(INT_MAX, shmmax)` compares
`INT_MAX` against `shmmax` rather than verifying `info.shmmax`. Use
`unsigned long long` with `"%llu"` to avoid 32-bit overflow when reading
`PATH_KERN_SHMMAX`, and assert `info.shmmax` equals `INT_MAX` when
`tst_is_compat_mode() && shmmax > INT_MAX` (or `shmmax` otherwise).

Verdict - Needs revision

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