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

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On 27. 08. 22, 10:34, Ondrej Mosnacek wrote:
On Sat, Aug 27, 2022 at 9:51 AM Jiri Slaby <jirislaby@xxxxxxxxxx> wrote:
On 23. 08. 22, 10:00, Greg Kroah-Hartman wrote:
From: Ondrej Mosnacek <omosnace@xxxxxxxxxx>

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.

It looks like both the Greg's generated patch and the final stable
commit (d7e676b7dc6a) are missing the addition of the empty
plugin-version.h file. It appears in the patch's diffstat, but not in
the actual diff. The mainline commit does include the empty file
correctly, so it's likely a bug in the stable cherry pick automation.

Right, this fixed the issue for me:
--- a/patches.kernel.org/5.19.4-144-kbuild-dummy-tools-avoid-tmpdir-leak-in-dummy-.patch +++ b/patches.kernel.org/5.19.4-144-kbuild-dummy-tools-avoid-tmpdir-leak-in-dummy-.patch
@@ -20,6 +20,8 @@ Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
  scripts/dummy-tools/gcc | 8 ++------
  1 file changed, 2 insertions(+), 6 deletions(-)

+diff --git a/scripts/dummy-tools/dummy-plugin-dir/include/plugin-version.h b/scripts/dummy-tools/dummy-plugin-dir/include/plugin-version.h
+new file mode 100644
 diff --git a/scripts/dummy-tools/gcc b/scripts/dummy-tools/gcc
 index b2483149bbe5..7db825843435 100755
 --- a/scripts/dummy-tools/gcc

Fixes: 76426e238834 ("kbuild: add dummy toolchains to enable all cc-option etc. in Kconfig")
Signed-off-by: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
   .../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

thanks,
--
js
suse labs




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