linux-kernel - [PATCH AUTOSEL 4.19 08/16] ktest.pl: Avoid false positives with grub2 skip regex

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Message-ID: <20241004183150.3676355-8-sashal@kernel.org>
Date: Fri,  4 Oct 2024 14:31:35 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Daniel Jordan <daniel.m.jordan@...cle.com>,
	John 'Warthog9' Hawley <warthog9@...lescrag.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 08/16] ktest.pl: Avoid false positives with grub2 skip regex

From: Daniel Jordan <daniel.m.jordan@...cle.com>

[ Upstream commit 2351e8c65404aabc433300b6bf90c7a37e8bbc4d ]

Some distros have grub2 config files with the lines

    if [ x"${feature_menuentry_id}" = xy ]; then
      menuentry_id_option="--id"
    else
      menuentry_id_option=""
    fi

which match the skip regex defined for grub2 in get_grub_index():

    $skip = '^\s*menuentry';

These false positives cause the grub number to be higher than it
should be, and the wrong kernel can end up booting.

Grub documents the menuentry command with whitespace between it and the
title, so make the skip regex reflect this.

Link: https://lore.kernel.org/20240904175530.84175-1-daniel.m.jordan@oracle.com
Signed-off-by: Daniel Jordan <daniel.m.jordan@...cle.com>
Acked-by: John 'Warthog9' Hawley (Tenstorrent) <warthog9@...lescrag.net>
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/ktest/ktest.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index a29d9e125b00b..fe73902a197c6 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -1969,7 +1969,7 @@ sub get_grub_index {
     } elsif ($reboot_type eq "grub2") {
 	$command = "cat $grub_file";
 	$target = '^\s*menuentry.*' . $grub_menu_qt;
-	$skip = '^\s*menuentry';
+	$skip = '^\s*menuentry\s';
 	$submenu = '^\s*submenu\s';
     } elsif ($reboot_type eq "grub2bls") {
         $command = $grub_bls_get;
-- 
2.43.0