linux-kernel - [PATCH] kernel: debug: kdb: strncpy issue, using strlcpy instead of strncpy.

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Message-ID: <5161526F.8070306@asianux.com>
Date:	Sun, 07 Apr 2013 19:03:11 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	jason.wessel@...driver.com, anton.vorontsov@...aro.org,
	sasha.levin@...cle.com, vincent.stehle@...oste.net,
	john.blackwood@...r.com
CC:	kgdb-bugreport@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] kernel: debug: kdb: strncpy issue, using strlcpy instead
 of strncpy.


  cmd_cur and cmd_hist[] are all NUL terminated string.
  need using strlcpy instead of strncpy.

Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 kernel/debug/kdb/kdb_main.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index 00eb8f7..a2b04d7 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -1063,12 +1063,12 @@ static int handle_ctrl_cmd(char *cmd)
 	case CTRL_P:
 		if (cmdptr != cmd_tail)
 			cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
-		strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+		strlcpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
 		return 1;
 	case CTRL_N:
 		if (cmdptr != cmd_head)
 			cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
-		strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+		strlcpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
 		return 1;
 	}
 	return 0;
@@ -1260,7 +1260,7 @@ do_full_getstr:
 		if (*cmdbuf != '\n') {
 			if (*cmdbuf < 32) {
 				if (cmdptr == cmd_head) {
-					strncpy(cmd_hist[cmd_head], cmd_cur,
+					strlcpy(cmd_hist[cmd_head], cmd_cur,
 						CMD_BUFLEN);
 					*(cmd_hist[cmd_head] +
 					  strlen(cmd_hist[cmd_head])-1) = '\0';
@@ -1270,7 +1270,7 @@ do_full_getstr:
 				cmdbuf = cmd_cur;
 				goto do_full_getstr;
 			} else {
-				strncpy(cmd_hist[cmd_head], cmd_cur,
+				strlcpy(cmd_hist[cmd_head], cmd_cur,
 					CMD_BUFLEN);
 			}
 
-- 
1.7.7.6
--
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