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Subject[RFC PATCH v2 7/7] selftests/ftrace: Add error_log testcase for probe errors
Date
Add error_log testcase for error logs on probe events.
This tests most of error cases and checks the error position
is correct.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v2:
- Specify error position in command string by "^"
- Clear error_log right before writing command
- Add uprobe syntax error testcase
---
.../ftrace/test.d/kprobe/kprobe_syntax_errors.tc | 93 ++++++++++++++++++++
.../ftrace/test.d/kprobe/uprobe_syntax_errors.tc | 31 +++++++
2 files changed, 124 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc

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
new file mode 100644
index 000000000000..281665b1348c
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
@@ -0,0 +1,93 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Kprobe event parser error log check
+
+[ -f kprobe_events ] || exit_unsupported # this is configurable
+
+[ -f error_log ] || exit_unsupported
+
+check_error() { # command-with-error-pos-by-^
+pos=$(echo -n "${1%^*}" | wc -c) # error position
+command=$(echo "$1" | tr -d ^)
+echo "Test command: $command"
+echo > error_log
+(! echo "$command" > kprobe_events ) >& /dev/null
+grep "trace_kprobe: error:" -A 3 error_log
+N=$(tail -n 1 error_log | wc -c)
+# " Command: " and "^\n" => 13
+test $(expr 13 + $pos) -eq $N
+}
+
+if grep -q 'r\[maxactive\]' README; then
+check_error 'p^100 vfs_read' # MAXACT_NO_KPROBE
+check_error 'r^1a111 vfs_read' # BAD_MAXACT
+check_error 'r^100000 vfs_read' # MAXACT_TOO_BIG
+fi
+
+check_error 'p ^non_exist_func' # BAD_PROBE_ADDR (enoent)
+check_error 'p ^hoge-fuga' # BAD_PROBE_ADDR (bad syntax)
+check_error 'p ^hoge+1000-1000' # BAD_PROBE_ADDR (bad syntax)
+check_error 'r ^vfs_read+10' # BAD_RETPROBE
+check_error 'p:^/bar vfs_read' # NO_GROUP_NAME
+check_error 'p:^12345678901234567890123456789012345678901234567890123456789012345/bar vfs_read' # GROUP_TOO_LONG
+
+check_error 'p:^foo.1/bar vfs_read' # BAD_GROUP_NAME
+check_error 'p:foo/^ vfs_read' # NO_EVENT_NAME
+check_error 'p:foo/^12345678901234567890123456789012345678901234567890123456789012345 vfs_read' # EVENT_TOO_LONG
+check_error 'p:foo/^bar.1 vfs_read' # BAD_EVENT_NAME
+
+check_error 'p vfs_read ^$retval' # RETVAL_ON_PROBE
+check_error 'p vfs_read ^$stack10000' # BAD_STACK_NUM
+
+if grep -q '$arg<N>' README; then
+check_error 'p vfs_read ^$arg10000' # BAD_ARG_NUM
+fi
+
+check_error 'p vfs_read ^$none_var' # BAD_VAR
+
+check_error 'p vfs_read ^%none_reg' # BAD_REG_NAME
+check_error 'p vfs_read ^@12345678abcde' # BAD_MEM_ADDR
+check_error 'p vfs_read ^@+10' # FILE_ON_KPROBE
+
+check_error 'p vfs_read ^+0@0)' # DEREF_NEED_BRACE
+check_error 'p vfs_read ^+0ab1(@0)' # BAD_DEREF_OFFS
+check_error 'p vfs_read +0(+0(@0^)' # DEREF_OPEN_BRACE
+
+if grep -A1 "fetcharg:" README | grep -q '\$comm' ; then
+check_error 'p vfs_read +0(^$comm)' # COMM_CANT_DEREF
+fi
+
+check_error 'p vfs_read ^&1' # BAD_FETCH_ARG
+
+
+# We've introduced this limitation with array support
+if grep -q ' <type>\\\[<array-size>\\\]' README; then
+check_error 'p vfs_read +0(^+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(+0(@0))))))))))))))' # TOO_MANY_OPS?
+check_error 'p vfs_read +0(@11):u8[10^' # ARRAY_NO_CLOSE
+check_error 'p vfs_read +0(@11):u8[10]^a' # BAD_ARRAY_SUFFIX
+check_error 'p vfs_read +0(@11):u8[^10a]' # BAD_ARRAY_NUM
+check_error 'p vfs_read +0(@11):u8[^256]' # ARRAY_TOO_BIG
+fi
+
+check_error 'p vfs_read @11:^unknown_type' # BAD_TYPE
+check_error 'p vfs_read $stack0:^string' # BAD_STRING
+check_error 'p vfs_read @11:^b10@a/16' # BAD_BITFIELD
+
+check_error 'p vfs_read ^arg123456789012345678901234567890=@11' # ARG_NAME_TOO_LOG
+check_error 'p vfs_read ^=@11' # NO_ARG_NAME
+check_error 'p vfs_read ^var.1=@11' # BAD_ARG_NAME
+check_error 'p vfs_read var1=@11 ^var1=@12' # USED_ARG_NAME
+check_error 'p vfs_read ^+1234567(+1234567(+1234567(+1234567(+1234567(+1234567(@1234))))))' # ARG_TOO_LONG
+check_error 'p vfs_read arg1=^' # NO_ARG_BODY
+
+# instruction boundary check is valid on x86 (at this moment)
+case $(uname -m) in
+ x86_64|i[3456]86)
+ echo 'p vfs_read' > kprobe_events
+ if grep -q FTRACE ../kprobes/list ; then
+ check_error 'p ^vfs_read+3' # BAD_INSN_BNDRY (only if function-tracer is enabled)
+ fi
+ ;;
+esac
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc b/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
new file mode 100644
index 000000000000..957011300bb7
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
@@ -0,0 +1,31 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: Uprobe event parser error log check
+
+[ -f uprobe_events ] || exit_unsupported # this is configurable
+
+[ -f error_log ] || exit_unsupported
+
+check_error() { # command-with-error-pos-by-^
+pos=$(echo -n "${1%^*}" | wc -c) # error position
+command=$(echo "$1" | tr -d ^)
+echo "Test command: $command"
+echo > error_log
+(! echo "$command" > uprobe_events ) >& /dev/null
+grep "trace_uprobe: error:" -A 3 error_log
+N=$(tail -n 1 error_log | wc -c)
+# " Command: " and "^\n" => 13
+test $(expr 13 + $pos) -eq $N
+}
+
+check_error 'p ^/non_exist_file:100' # FILE_NOT_FOUND
+check_error 'p ^/sys:100' # NO_REGULAR_FILE
+check_error 'p /bin/sh:^10a' # BAD_UPROBE_OFFS
+check_error 'p /bin/sh:10(^1a)' # BAD_REFCNT
+check_error 'p /bin/sh:10(10^' # REFCNT_OPEN_BRACE
+check_error 'p /bin/sh:10(10)^a' # BAD_REFCNT_SUFFIX
+
+check_error 'p /bin/sh:10 ^@+ab' # BAD_FILE_OFFS
+check_error 'p /bin/sh:10 ^@symbol' # SYM_ON_UPROBE
+
+exit 0
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