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

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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>
This commit is contained in:
Masami Hiramatsu 2019-03-14 13:30:30 +09:00 committed by Steven Rostedt (VMware)
parent dec65d79fd
commit b4443c17a3
2 changed files with 3 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
kernel/trace/trace_probe.c
View file

@ -554,6 +554,8 @@ int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
body = strchr(arg, '='); body = strchr(arg, '=');
if (body) { if (body) {
if (body - arg > MAX_ARG_NAME_LEN || body == arg)
return -EINVAL;
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL); parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
body++; body++;
} else { } else {

1
kernel/trace/trace_probe.h
View file

@ -32,6 +32,7 @@
#define MAX_TRACE_ARGS 128 #define MAX_TRACE_ARGS 128
#define MAX_ARGSTR_LEN 63 #define MAX_ARGSTR_LEN 63
#define MAX_ARRAY_LEN 64 #define MAX_ARRAY_LEN 64
#define MAX_ARG_NAME_LEN 32
#define MAX_STRING_SIZE PATH_MAX #define MAX_STRING_SIZE PATH_MAX
/* Reserved field names */ /* Reserved field names */