linux-kernel - [PATCH 5.10 055/158] kbuild: dummy-tools: avoid tmpdir leak in dummy gcc

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Date:   Tue, 23 Aug 2022 10:26:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ondrej Mosnacek <omosnace@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH 5.10 055/158] kbuild: dummy-tools: avoid tmpdir leak in dummy gcc

From: Ondrej Mosnacek <omosnace@...hat.com>

commit aac289653fa5adf9e9985e4912c1d24a3e8cbab2 upstream.

When passed -print-file-name=plugin, the dummy gcc script creates a
temporary directory that is never cleaned up. To avoid cluttering
$TMPDIR, instead use a static directory included in the source tree.

Fixes: 76426e238834 ("kbuild: add dummy toolchains to enable all cc-option etc. in Kconfig")
Signed-off-by: Ondrej Mosnacek <omosnace@...hat.com>
Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 .../dummy-tools/dummy-plugin-dir/include/plugin-version.h | 0
 scripts/dummy-tools/gcc |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)
 create mode 100644 scripts/dummy-tools/dummy-plugin-dir/include/plugin-version.h

--- a/scripts/dummy-tools/gcc
+++ b/scripts/dummy-tools/gcc
@@ -77,12 +77,8 @@ fi
 
 # To set GCC_PLUGINS
 if arg_contain -print-file-name=plugin "$@"; then
-	plugin_dir=$(mktemp -d)
-
-	mkdir -p $plugin_dir/include
-	touch $plugin_dir/include/plugin-version.h
-
-	echo $plugin_dir
+	# Use $0 to find the in-tree dummy directory
+	echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir"
 	exit 0
 fi