[LTP] binfmt_misc02.sh: Fix interpreter with uutils/coreutils

[linuxtestproject.agent@gmail.com]

Hi Kuan-Ying,

On Wed, 21 Oct 2026, Kuan-Ying Lee wrote:
> binfmt_misc02.sh: Fix interpreter with uutils/coreutils

> +	interp_dir=$(mktemp -d "$TMPDIR/ltp_binfmt_miscXXXXXX")
> +	[ -d "$interp_dir" ] || tst_brk TBROK "Failed to create interpreter dir"

With TMPDIR on a noexec filesystem and the datafiles on an executable
filesystem, open_exec() rejects this new interpreter with EACCES, causing
subtests 1-4 to report TFAIL despite working binfmt_misc support. The
previous system-cat interpreter did not depend on TMPDIR being executable.
Detect a noexec TMPDIR during setup and report TCONF, or place the wrapper
on an executable filesystem.

> +	printf '#!/bin/sh\nexec %s "$1"\n' "$(command -v cat)" > "$interp" ||

The resolved cat pathname is inserted unquoted into shell source: with
cat in a PATH directory containing spaces, the generated exec command
splits the pathname and exits 127 instead of running cat. Generate a
literal exec cat "$1" command instead, letting the shell perform PATH
lookup without reparsing the resolved pathname.

Verdict - Needs revision

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