linux-kernel - [PATCH] arch: alpha: kernel: using memcpy() instead of strcpy()

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Message-ID: <51A5DDB0.50504@asianux.com>
Date:	Wed, 29 May 2013 18:51:28 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	rth@...ddle.net, ink@...assic.park.msu.ru, mattst88@...il.com,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	josh@...htriplett.org, srivatsa.bhat@...ux.vnet.ibm.com
CC:	Greg KH <gregkh@...uxfoundation.org>, linux-alpha@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: [PATCH] arch: alpha: kernel: using memcpy() instead of strcpy()


When sending message in send_secondary_console_msg(), the length is not
include the NUL byte, and also not copy NUL to 'ipc_buffer'.

When receive message in recv_secondary_console_msg(), the 'cnt' also
excludes NUL.

So when get string from ipc_buffer, it may not be NUL terminated.

Then use memcpy() instead of strcpy(), and set last byte NUL.


Signed-off-by: Chen Gang <gang.chen@...anux.com>
---
 arch/alpha/kernel/smp.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index 7b60834..d3d2040 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -266,7 +266,8 @@ recv_secondary_console_msg(void)
 		else {
 			cp1 = (char *) &cpu->ipc_buffer[11];
 			cp2 = buf;
-			strcpy(cp2, cp1);
+			memcpy(cp2, cp1, cnt);
+			cp2[cnt] = '\0';
 			
 			while ((cp2 = strchr(cp2, '\r')) != 0) {
 				*cp2 = ' ';
-- 
1.7.7.6
--
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