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@linux.ibm.com Acked-by: Naveen N. Rao naveen.n.rao@linux.vnet.ibm.com Acked-by: Masami Hiramatsu (Google) mhiramat@kernel.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"