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Subject[PATCH v2] selftests/ftrace: Use printf instead of echo in kprobe syntax error tests
Date
Test cases which use echo to write strings containing backslashes
fail with some shells, as echo's treatment of backslashes in
strings varies between shell implementations. Use printf instead,
as it should behave consistently across different shells. This
requires adjustments to the strings to escape \ and % characters.
ftrace_errlog_check() must also re-escape these characters after
processing them to remove ^ characters.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
---
Changes in v2:
- Escape backslashes for a couple of additional tests

.../testing/selftests/ftrace/test.d/functions | 6 +++---
.../test.d/kprobe/kprobe_syntax_errors.tc | 20 +++++++++----------
2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
index 5d4550591ff9..b38c6eb029e8 100644
--- a/tools/testing/selftests/ftrace/test.d/functions
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -114,11 +114,11 @@ yield() {
}

ftrace_errlog_check() { # err-prefix command-with-error-pos-by-^ command-file
- pos=$(echo -n "${2%^*}" | wc -c) # error position
- command=$(echo "$2" | tr -d ^)
+ pos=$(printf "${2%^*}" | wc -c) # error position
+ command=$(printf "$2" | sed -e 's/\^//g' -e 's/%/%%/g' -e 's/\\/\\\\/g')
echo "Test command: $command"
echo > error_log
- (! echo "$command" >> "$3" ) 2> /dev/null
+ (! printf "$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..039c03d230b9 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
@@ -37,14 +37,14 @@ fi

check_error 'p vfs_read ^$none_var' # BAD_VAR

-check_error 'p vfs_read ^%none_reg' # BAD_REG_NAME
+check_error 'p vfs_read ^%%none_reg' # BAD_REG_NAME
check_error 'p vfs_read ^@12345678abcde' # BAD_MEM_ADDR
check_error 'p vfs_read ^@+10' # FILE_ON_KPROBE

grep -q "imm-value" README && \
-check_error 'p vfs_read arg1=\^x' # BAD_IMM
+check_error 'p vfs_read arg1=\\^x' # BAD_IMM
grep -q "imm-string" README && \
-check_error 'p vfs_read arg1=\"abcd^' # IMMSTR_NO_CLOSE
+check_error 'p vfs_read arg1=\\"abcd^' # IMMSTR_NO_CLOSE

check_error 'p vfs_read ^+0@0)' # DEREF_NEED_BRACE
check_error 'p vfs_read ^+0ab1(@0)' # BAD_DEREF_OFFS
@@ -80,7 +80,7 @@ check_error 'p vfs_read arg1=^' # NO_ARG_BODY
# instruction boundary check is valid on x86 (at this moment)
case $(uname -m) in
x86_64|i[3456]86)
- echo 'p vfs_read' > kprobe_events
+ printf 'p vfs_read' > kprobe_events
if grep -q FTRACE ../kprobes/list ; then
check_error 'p ^vfs_read+3' # BAD_INSN_BNDRY (only if function-tracer is enabled)
fi
@@ -89,13 +89,13 @@ esac

# multiprobe errors
if grep -q "Create/append/" README && grep -q "imm-value" README; then
-echo 'p:kprobes/testevent _do_fork' > kprobe_events
+printf '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
-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
-check_error '^p:kprobes/testevent _do_fork abcd=\1' # SAME_PROBE
+printf '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
+check_error '^p:kprobes/testevent _do_fork abcd=\\1' # SAME_PROBE
fi

exit 0
--
2.25.0
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