xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tracing/probe: Reject exactly same probe event

Browse Source 
Reject exactly same probe events as existing probes.

Multiprobe allows user to define multiple probes on same
event. If user appends a probe which exactly same definition
(same probe address and same arguments) on existing event,
the event will record same probe information twice.
That can be confusing users, so reject it.

Link: http://lkml.kernel.org/r/156879694602.31056.5533024778165036763.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
2019-09-18 17:55:46 +09:00
committed by Steven Rostedt (VMware)
parent 44d00dc7ce
commit fe60b0ce8e
3 changed files with 90 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
kernel/trace/trace_uprobe.c
View File

@@ -410,10 +410,53 @@ unreg:
return 0;
}
static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig,
struct trace_uprobe *comp)
{
struct trace_probe_event *tpe = orig->tp.event;
struct trace_probe *pos;
struct inode *comp_inode = d_real_inode(comp->path.dentry);
int i;
list_for_each_entry(pos, &tpe->probes, list) {
orig = container_of(pos, struct trace_uprobe, tp);
if (comp_inode != d_real_inode(orig->path.dentry) ||
comp->offset != orig->offset)
continue;
/*
* trace_probe_compare_arg_type() ensured that nr_args and
* each argument name and type are same. Let's compare comm.
*/
for (i = 0; i < orig->tp.nr_args; i++) {
if (strcmp(orig->tp.args[i].comm,
comp->tp.args[i].comm))
continue;
}
return true;
}
return false;
}
static int append_trace_uprobe(struct trace_uprobe *tu, struct trace_uprobe *to)
{
int ret;
ret = trace_probe_compare_arg_type(&tu->tp, &to->tp);
if (ret) {
/* Note that argument starts index = 2 */
trace_probe_log_set_index(ret + 1);
trace_probe_log_err(0, DIFF_ARG_TYPE);
return -EEXIST;
}
if (trace_uprobe_has_same_uprobe(to, tu)) {
trace_probe_log_set_index(0);
trace_probe_log_err(0, SAME_PROBE);
return -EEXIST;
}
/* Append to existing event */
ret = trace_probe_append(&tu->tp, &to->tp);
if (!ret)
@@ -469,14 +512,7 @@ static int register_trace_uprobe(struct trace_uprobe *tu)
trace_probe_log_err(0, DIFF_PROBE_TYPE);
ret = -EEXIST;
} else {
ret = trace_probe_compare_arg_type(&tu->tp, &old_tu->tp);
if (ret) {
/* Note that argument starts index = 2 */
trace_probe_log_set_index(ret + 1);
trace_probe_log_err(0, DIFF_ARG_TYPE);
ret = -EEXIST;
} else
ret = append_trace_uprobe(tu, old_tu);
ret = append_trace_uprobe(tu, old_tu);
}
goto end;
}