linux-kernel - [PATCH] tracing/probe: Fix same probe event argument matching

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Date:   Tue, 24 Sep 2019 17:19:06 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Naveen Rao <naveen.n.rao@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: [PATCH] tracing/probe: Fix same probe event argument matching

Commit fe60b0ce8e73 ("tracing/probe: Reject exactly same probe event")
tries to reject a event which matches an already existing probe.

However it currently continues to match arguments and rejects adding a
probe even when the arguments don't match. Fix this by only rejecting a
probe if and only if all the arguments match.

Fixes: fe60b0ce8e73 ("tracing/probe: Reject exactly same probe event")
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
 kernel/trace/trace_kprobe.c | 5 +++--
 kernel/trace/trace_uprobe.c | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index a6697e28ddda..402dc3ce88d3 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -549,10 +549,11 @@ static bool trace_kprobe_has_same_kprobe(struct trace_kprobe *orig,
 		for (i = 0; i < orig->tp.nr_args; i++) {
 			if (strcmp(orig->tp.args[i].comm,
 				   comp->tp.args[i].comm))
-				continue;
+				break;
 		}
 
-		return true;
+		if (i == orig->tp.nr_args)
+			return true;
 	}
 
 	return false;
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 34dd6d0016a3..dd884341f5c5 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -431,10 +431,11 @@ static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig,
 		for (i = 0; i < orig->tp.nr_args; i++) {
 			if (strcmp(orig->tp.args[i].comm,
 				   comp->tp.args[i].comm))
-				continue;
+				break;
 		}
 
-		return true;
+		if (i == orig->tp.nr_args)
+			return true;
 	}
 
 	return false;
-- 
2.18.1