linux-kernel - [PATCH] kernel: debug: kdb: kdb_io.c: Cleaning up missing null-terminate in conjunction with strncpy

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Date:	Sat, 26 Jul 2014 16:44:55 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Jason Wessel <jason.wessel@...driver.com>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Borislav Petkov <bp@...e.de>,
	Kees Cook <keescook@...omium.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	kgdb-bugreport@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH] kernel: debug: kdb: kdb_io.c:  Cleaning up missing null-terminate in conjunction with strncpy

Replacing strncpy with strlcpy to avoid strings that lacks null terminate.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 kernel/debug/kdb/kdb_io.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 7c70812..27977c0 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -361,9 +361,9 @@ poll_again:
 			kdb_printf("%s", buffer);
 		} else if (tab != 2 && count > 0) {
 			len_tmp = strlen(p_tmp);
-			strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
+			strlcpy(p_tmp+len_tmp, cp, lastchar-cp+1);
 			len_tmp = strlen(p_tmp);
-			strncpy(cp, p_tmp+len, len_tmp-len + 1);
+			strlcpy(cp, p_tmp+len, len_tmp-len + 1);
 			len = len_tmp - len;
 			kdb_printf("%s", cp);
 			cp += len;
@@ -442,7 +442,7 @@ poll_again:
 char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
 {
 	if (prompt && kdb_prompt_str != prompt)
-		strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
+		strlcpy(kdb_prompt_str, prompt, CMD_BUFLEN);
 	kdb_printf(kdb_prompt_str);
 	kdb_nextline = 1;	/* Prompt and input resets line number */
 	return kdb_read(buffer, bufsize);
-- 
1.7.10.4

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