linux-kernel - [PATCH] kdb: Make the internal env 'KDBFLAGS' undefinable

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Date:   Mon, 11 May 2020 10:16:37 +0800
From:   Wei Li <liwei391@...wei.com>
To:     Jason Wessel <jason.wessel@...driver.com>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Douglas Anderson <dianders@...omium.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
CC:     <kgdb-bugreport@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] kdb: Make the internal env 'KDBFLAGS' undefinable

'KDBFLAGS' is an internal variable of kdb, it is combined by 'KDBDEBUG'
and state flags. But the user can define an environment variable named
'KDBFLAGS' too, so let's make it undefinable to avoid confusion.

Signed-off-by: Wei Li <liwei391@...wei.com>
---
 kernel/debug/kdb/kdb_main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 4fc43fb17127..d3d060136821 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -423,7 +423,8 @@ int kdb_set(int argc, const char **argv)
 			| (debugflags << KDB_DEBUG_FLAG_SHIFT);
 
 		return 0;
-	}
+	} else if (strcmp(argv[1], "KDBFLAGS") == 0)
+		return KDB_NOPERM;
 
 	/*
 	 * Tokenizer squashed the '=' sign.  argv[1] is variable
-- 
2.17.1