kernel: tracing: Use strlcpy instead of strncpy

Use strlcpy() instead of strncpy() as it will always add a '\0'
to the end of the string even if the buffer is smaller than what
is being copied.

Link: http://lkml.kernel.org/r/51624254.30301@asianux.com

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2 files changed, 4 insertions, 4 deletions

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 25770824598f..548a1f7ea2c1 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3496,14 +3496,14 @@ static char ftrace_filter_buf[FTRACE_FILTER_SIZE] __initdata;
 
 static int __init set_ftrace_notrace(char *str)
 {
-        strncpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);
+        strlcpy(ftrace_notrace_buf, str, FTRACE_FILTER_SIZE);
         return 1;
 }
 __setup("ftrace_notrace=", set_ftrace_notrace);
 
 static int __init set_ftrace_filter(char *str)
 {
-        strncpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);
+        strlcpy(ftrace_filter_buf, str, FTRACE_FILTER_SIZE);
         return 1;
 }
 __setup("ftrace_filter=", set_ftrace_filter);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 829b2bee24e8..07860b995752 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -125,7 +125,7 @@ static bool allocate_snapshot;
 
 static int __init set_cmdline_ftrace(char *str)
 {
-        strncpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
+        strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
         default_bootup_tracer = bootup_tracer_buf;
         /* We are using ftrace early, expand it */
         ring_buffer_expanded = true;
@@ -164,7 +164,7 @@ static char *trace_boot_options __initdata;
 
 static int __init set_trace_boot_options(char *str)
 {
-        strncpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
+        strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
         trace_boot_options = trace_boot_options_buf;
         return 0;
 }