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From: Arnd Bergmann <arnd@arndb.de>
To: Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Tom Zanussi <tom.zanussi@linux.intel.com>,
	Rajvi Jingar <rajvi.jingar@intel.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH] tracing: avoid string overflow
Date: Wed, 28 Mar 2018 16:09:10 +0200
Message-ID: <20180328140920.2842153-1-arnd@arndb.de> (raw)

'err' is used as a NUL-terminated string, but using strncpy() with the length
equal to the buffer size may result in lack of the termination:

kernel/trace/trace_events_hist.c: In function 'hist_err_event':
kernel/trace/trace_events_hist.c:396:3: error: 'strncpy' specified bound 256 equals destination size [-Werror=stringop-truncation]
   strncpy(err, var, MAX_FILTER_STR_VAL);

This changes it to use the safer strscpy() instead.

Fixes: f404da6e1d46 ("tracing: Add 'last error' error facility for hist triggers")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/trace/trace_events_hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 4f027642ceef..8357f36d7a1e 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -393,7 +393,7 @@ static void hist_err_event(char *str, char *system, char *event, char *var)
 	else if (system)
 		snprintf(err, MAX_FILTER_STR_VAL, "%s.%s", system, event);
 	else
-		strncpy(err, var, MAX_FILTER_STR_VAL);
+		strscpy(err, var, MAX_FILTER_STR_VAL);
 
 	hist_err(str, err);
 }
-- 
2.9.0

             reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-28 14:09 Arnd Bergmann [this message]
2018-03-28 14:32 ` Tom Zanussi
2018-04-02 15:28 ` Steven Rostedt

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