linux-kernel - [PATCH 2/2] selftests/ftrace: Make uprobe test more robust against binary name

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Message-ID: <173625187633.1383744.2840679071525852811.stgit@devnote2>
Date: Tue,  7 Jan 2025 21:11:16 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
	Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	mhiramat@...nel.org,
	linux-kselftest@...r.kernel.org
Subject: [PATCH 2/2] selftests/ftrace: Make uprobe test more robust against binary name

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Make add_remove_uprobe test case more robust against various real
binary name.
Current add_remove_uprobe.tc test expects the real binary of /bin/sh
is '*/bin/*sh', but it does not work on busybox environment.
Instead of using fixed pattern, use readlink to identify real binary
name.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 .../ftrace/test.d/dynevent/add_remove_uprobe.tc    |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_uprobe.tc b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_uprobe.tc
index a275decdc880..86c76679c56e 100644
--- a/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_uprobe.tc
+++ b/tools/testing/selftests/ftrace/test.d/dynevent/add_remove_uprobe.tc
@@ -6,8 +6,10 @@
 echo 0 > events/enable
 echo > dynamic_events
 
+REALBIN=`readlink -f /bin/sh`
+
 echo 'cat /proc/$$/maps' | /bin/sh | \
-	grep "r-xp .*/bin/.*sh$" | \
+	grep "r-xp .*${REALBIN}$" | \
 	awk '{printf "p:myevent %s:0x%s\n", $6,$3 }' >> uprobe_events
 
 grep -q myevent uprobe_events