tracing/probe: Check the size of argument name and body

Check the size of argument name and expression is not 0
and smaller than maximum length.

Link: http://lkml.kernel.org/r/155253783029.14922.12650939303827581096.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 0dc13bf..bf9d3d7 100644 (file)
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -554,6 +554,8 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
 
        body = strchr(arg, '=');
        if (body) {
+               if (body - arg > MAX_ARG_NAME_LEN || body == arg)
+                       return -EINVAL;
                parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
                body++;
        } else {

diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index 8a63f8b..2177c20 100644 (file)
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -32,6 +32,7 @@
 #define MAX_TRACE_ARGS         128
 #define MAX_ARGSTR_LEN         63
 #define MAX_ARRAY_LEN          64
+#define MAX_ARG_NAME_LEN       32
 #define MAX_STRING_SIZE                PATH_MAX
 
 /* Reserved field names */