Since the built-in echo has different behavior in POSIX shell (dash) and bash, kprobe_syntax_errors.tc can fail on dash which interpret backslash escape automatically.
To fix this issue, we explicitly use /bin/echo -E (not interpret backslash escapes) if the command string can include backslash. Reported-by: Liu Yiding <[email protected]> Suggested-by: Xiao Yang <[email protected]> Signed-off-by: Masami Hiramatsu <[email protected]> --- tools/testing/selftests/ftrace/test.d/functions | 8 +++++--- .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc | 4 +++- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions index 61a3c7e2634d..69708830026f 100644 --- a/tools/testing/selftests/ftrace/test.d/functions +++ b/tools/testing/selftests/ftrace/test.d/functions @@ -119,12 +119,14 @@ yield() { ping $LOCALHOST -c 1 || sleep .001 || usleep 1 || sleep 1 } +# Since probe event command may include backslash, explicitly use /bin/echo -E +# to NOT interpret it. ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file - pos=$(echo -n "${2%^*}" | wc -c) # error position - command=$(echo "$2" | tr -d ^) + pos=$(/bin/echo -En "${2%^*}" | wc -c) # error position + command=$(/bin/echo -E "$2" | tr -d ^) echo "Test command: $command" echo > error_log - (! echo "$command" >> "$3" ) 2> /dev/null + (! /bin/echo -E "$command" >> "$3" ) 2> /dev/null grep "$1: error:" -A 3 error_log N=$(tail -n 1 error_log | wc -c) # " Command: " and "^\n" => 13 diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc index ef1e9bafb098..4cfcf9440a1a 100644 --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc @@ -91,7 +91,9 @@ esac if grep -q "Create/append/" README && grep -q "imm-value" README; then echo 'p:kprobes/testevent _do_fork' > kprobe_events check_error '^r:kprobes/testevent do_exit' # DIFF_PROBE_TYPE -echo 'p:kprobes/testevent _do_fork abcd=\1' > kprobe_events + +# Explicitly use /bin/echo -E to not interpret \1 +/bin/echo -E 'p:kprobes/testevent _do_fork abcd=\1' > kprobe_events check_error 'p:kprobes/testevent _do_fork ^bcd=\1' # DIFF_ARG_TYPE check_error 'p:kprobes/testevent _do_fork ^abcd=\1:u8' # DIFF_ARG_TYPE check_error 'p:kprobes/testevent _do_fork ^abcd=\"foo"' # DIFF_ARG_TYPE
