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selftests/ftrace: Add new test case which adds multiple consecutive probes in a function

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Commit 97f88a3d72 ("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.

Link: https://lore.kernel.org/linux-trace-kernel/20230428163842.95118-2-akanksha@linux.ibm.com

Signed-off-by: Akanksha J N <akanksha@linux.ibm.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
This commit is contained in:
Akanksha J N 2023-06-06 21:39:57 +09:00 committed by Masami Hiramatsu (Google)
parent 590e7b2804
commit cf9071dd46
1 changed files with 19 additions and 0 deletions
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19
tools/testing/selftests/ftrace/test.d/kprobe/kprobe_insn_boundary.tc Normal file
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#!/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"