From: Roel Kluin <roel.kluin@gmail.com>
To: arnd@arndb.de, linuxppc-dev@ozlabs.org, cbe-oss-dev@ozlabs.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH] powerpc/cell: strncpy does not null terminate string
Date: Fri, 17 Jul 2009 14:41:41 +0200 [thread overview]
Message-ID: <4A607185.6020302@gmail.com> (raw)
With `sizeof(string) - 1` strncpy() will null terminate the string.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
---
To test this:
#include <stdio.h>
#include <string.h>
char a[10];
char b[10];
int main()
{
const char* str = "0123456789012";
strncpy(a, str, sizeof(a));
strncpy(b, str, sizeof(b) - 1);
printf("String a was %s, b was %s\n", a, b);
return 0;
}
Output:
String a was 0123456789012345678, b was 012345678
diff --git a/arch/powerpc/platforms/cell/celleb_setup.c b/arch/powerpc/platforms/cell/celleb_setup.c
index 07c234f..cfdbadb 100644
--- a/arch/powerpc/platforms/cell/celleb_setup.c
+++ b/arch/powerpc/platforms/cell/celleb_setup.c
@@ -80,7 +80,7 @@ static void celleb_show_cpuinfo(struct seq_file *m)
static int __init celleb_machine_type_hack(char *ptr)
{
- strncpy(celleb_machine_type, ptr, sizeof(celleb_machine_type));
+ strncpy(celleb_machine_type, ptr, sizeof(celleb_machine_type) - 1);
celleb_machine_type[sizeof(celleb_machine_type)-1] = 0;
return 0;
}
next reply other threads:[~2009-07-17 12:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-17 12:41 Roel Kluin [this message]
2009-07-17 14:27 ` [PATCH] powerpc/cell: strncpy does not null terminate string Roel Kluin
2009-07-17 15:56 ` Arnd Bergmann
2009-07-21 9:31 ` Ken Kawakami
2009-07-17 15:05 ` Arnd Bergmann
2009-07-17 15:19 ` roel kluin
2009-07-21 10:17 ` [PATCH] powerpc/cell: replace strncpy by strlcpy Roel Kluin
2009-07-22 4:22 ` Ken Kawakami
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