linux-kernel - Re: [PATCH 5.19 145/365] kbuild: dummy-tools: avoid tmpdir leak in dummy gcc

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Date:   Sat, 27 Aug 2022 09:51:09 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, Ondrej Mosnacek <omosnace@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [PATCH 5.19 145/365] kbuild: dummy-tools: avoid tmpdir leak in
 dummy gcc

On 23. 08. 22, 10:00, Greg Kroah-Hartman wrote:
> 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.

This breaks our (SUSE) use of dummy tools (GCC_PLUGINS became =n). I 
will investigate whether this is stable-only and the root cause later.

> 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
> @@ -96,12 +96,8 @@ 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
>   
> 
> 

-- 
js
suse labs