linux-kernel - [PATCH v3 1/2] selftests/ftrace: Add new test case which adds multiple consecutive probes in a function

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Message-Id: <20230428163842.95118-2-akanksha@linux.ibm.com>
Date:   Fri, 28 Apr 2023 22:08:41 +0530
From:   Akanksha J N <akanksha@...ux.ibm.com>
To:     linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     rostedt@...dmis.org, mhiramat@...nel.org, shuah@...nel.org,
        naveen.n.rao@...ux.ibm.com, akanksha@...ux.ibm.com,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Subject: [PATCH v3 1/2] selftests/ftrace: Add new test case which adds multiple consecutive probes in a function

Commit 97f88a3d723162 ("powerpc/kprobes: Fix null pointer reference in
arch_prepare_kprobe()") fixed a recent kernel oops that was caused as
ftrace-based kprobe does not generate kprobe::ainsn::insn and it gets
set to NULL.
Add new test case kprobe_insn_boundary.tc which adds a
kprobe at every byte within $FUNCTION_FORK up to an offset of 256 bytes,
to be able to test potential issues with kprobes on
successive instructions.
The '|| continue' is added with the echo statement to ignore errors that
are caused by trying to add kprobes to non probeable lines and continue
with the test.

Signed-off-by: Akanksha J N <akanksha@...ux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 .../test.d/kprobe/kprobe_insn_boundary.tc     | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
new file mode 100644
index 000000000000..4f7cc318f331
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc
@@ -0,0 +1,19 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2023 Akanksha J N, IBM corporation
+# description: Register multiple kprobe events in a function
+# requires: kprobe_events
+
+for i in `seq 0 255`; do
+  echo p $FUNCTION_FORK+${i} >> kprobe_events || continue
+done
+
+cat kprobe_events >> $testlog
+
+echo 1 > events/kprobes/enable
+( echo "forked" )
+echo 0 > events/kprobes/enable
+echo > kprobe_events
+echo "Waiting for unoptimizing & freeing"
+sleep 5
+echo "Done"
-- 
2.31.1