linux-kernel - [PATCH][UML] Boot broken due to buffer overrun

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Message-ID: <20081129100830.GA24128@balbir.in.ibm.com>
Date:	Sat, 29 Nov 2008 15:38:30 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	jdike@...toit.com
Cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: [PATCH][UML] Boot broken due to buffer overrun


mconsole_init() passed 256 bytes as length in os_create_unix_socket, while
the sizeof UNIX_PATH_MAX is 108. This patch fixes that problem and avoids
a big overrun bug reported on UML bootup.

Reported-by: Vikas K Managutte <vikki.km@...il.com>
Reported-by: Sarvesh Kumar Lal Das <skldas@...il.com>
Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
---

 arch/um/drivers/mconsole_kern.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -puN arch/um/drivers/mconsole_kern.c~fix-uml-buggy-socket-creation arch/um/drivers/mconsole_kern.c
--- linux-2.6.28-rc6/arch/um/drivers/mconsole_kern.c~fix-uml-buggy-socket-creation	2008-11-29 15:29:04.000000000 +0530
+++ linux-2.6.28-rc6-balbir/arch/um/drivers/mconsole_kern.c	2008-11-29 15:32:23.000000000 +0530
@@ -16,6 +16,8 @@
 #include <linux/slab.h>
 #include <linux/syscalls.h>
 #include <linux/utsname.h>
+#include <linux/socket.h>
+#include <linux/un.h>
 #include <linux/workqueue.h>
 #include <linux/mutex.h>
 #include <asm/uaccess.h>
@@ -785,7 +787,7 @@ static int __init mconsole_init(void)
 	/* long to avoid size mismatch warnings from gcc */
 	long sock;
 	int err;
-	char file[256];
+	char file[UNIX_PATH_MAX];
 
 	if (umid_file_name("mconsole", file, sizeof(file)))
 		return -1;
_

-- 
	Balbir
--
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