From: Masami Hiramatsu (Google) mhiramat@kernel.org
Add argument limitation test case for dynamic events. This is a boudary check for the maximum number of the probe event arguments.
Signed-off-by: Masami Hiramatsu (Google) mhiramat@kernel.org --- .../ftrace/test.d/dynevent/dynevent_limitations.tc | 42 ++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/dynevent_limitations.tc
diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/dynevent_limitations.tc b/tools/testing/selftests/ftrace/test.d/dynevent/dynevent_limitations.tc new file mode 100644 index 000000000000..6b94b678741a --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/dynevent/dynevent_limitations.tc @@ -0,0 +1,42 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: Checking dynamic events limitations +# requires: dynamic_events "imm-value":README + +# Max arguments limitation +MAX_ARGS=128 +EXCEED_ARGS=$((MAX_ARGS + 1)) + +check_max_args() { # event_header + TEST_STRING=$1 + # Acceptable + for i in `seq 1 $MAX_ARGS`; do + TEST_STRING="$TEST_STRING \$i" + done + echo "$TEST_STRING" >> dynamic_events + echo > dynamic_events + # Error + TEST_STRING="$TEST_STRING \$EXCEED_ARGS" + ! echo "$TEST_STRING" >> dynamic_events + return 0 +} + +# Kprobe max args limitation +if grep -q "kprobe_events" README; then + check_max_args "p vfs_read" +fi + +# Fprobe max args limitation +if grep -q "f[:[<group>/][<event>]] <func-name>[%return] [<args>]" README; then + check_max_args "f vfs_read" +fi + +# Tprobe max args limitation +if grep -q "t[:[<group>/][<event>]] <tracepoint> [<args>]" README; then + check_max_args "t kfree" +fi + +# Uprobe max args limitation +if grep -q "uprobe_events" README; then + check_max_args "p /bin/sh:10" +fi