linux-kernel - [PATCH v3 16/22] dyndbg: disambiguate quoting in a debug msg

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Message-ID: <20231223015131.2836090-17-lb@semihalf.com>
Date: Sat, 23 Dec 2023 02:51:25 +0100
From: Łukasz Bartosik <lb@...ihalf.com>
To: Jason Baron <jbaron@...mai.com>,
	Jim Cromie <jim.cromie@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Douglas Anderson <dianders@...omium.org>
Cc: Guenter Roeck <groeck@...gle.com>,
	Yaniv Tzoreff <yanivt@...gle.com>,
	Benson Leung <bleung@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Vincent Whitchurch <vincent.whitchurch@...s.com>,
	Pekka Paalanen <ppaalanen@...il.com>,
	Sean Paul <seanpaul@...omium.org>,
	Daniel Vetter <daniel@...ll.ch>,
	Simon Ser <contact@...rsion.fr>,
	John Ogness <john.ogness@...utronix.de>,
	Petr Mladek <pmladek@...e.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-kernel@...r.kernel.org,
	upstream@...ihalf.com
Subject: [PATCH v3 16/22] dyndbg: disambiguate quoting in a debug msg

From: Jim Cromie <jim.cromie@...il.com>

When debugging a query parsing error, the debug message wraps the
query in escaped-double-quotes.  This is confusing when mixed with any
quoted args where quotes are stripped by the shell.

So this replaces the \"%s\" with <%s> in the format string, allowing a
user to see how the shell strips quotes:

lx]# echo  module "foo" format ,_ -f > /proc/dynamic_debug/control
[  716.037430] dyndbg: read 26 bytes from userspace
[  716.037966] dyndbg: query 0: <module foo format ,_ -f> on module: <*>

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 65dafdec7b76..8ce485fc84ff 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -955,7 +955,7 @@ static int ddebug_exec_queries(char *query, const char *modname)
 		if (!query || !*query || *query == '#')
 			continue;
 
-		vpr_info("query %d: \"%s\" mod:%s\n", i, query, modname ?: "*");
+		vpr_info("query %d: <%s> on module: <%s>\n", i, query, modname ?: "*");
 
 		rc = ddebug_exec_query(query, modname);
 		if (rc < 0) {
-- 
2.43.0.472.g3155946c3a-goog