1 #!/bin/sh
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # This reads tests.txt for the list of LKDTM tests to invoke. Any marked
5 # with a leading "#" are skipped. The rest of the line after the
6 # test name is either the text to look for in dmesg for a "success",
7 # or the rationale for why a test is marked to be skipped.
8 #
9 set -e
10 TRIGGER=/sys/kernel/debug/provoke-crash/DIRECT
11 CLEAR_ONCE=/sys/kernel/debug/clear_warn_once
12 KSELFTEST_SKIP_TEST=4
13
14 # Verify we have LKDTM available in the kernel.
15 if [ ! -r $TRIGGER ] ; then
16 /sbin/modprobe -q lkdtm || true
17 if [ ! -r $TRIGGER ] ; then
18 echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)"
19 else
20 echo "Cannot write $TRIGGER (need to run as root?)"
21 fi
22 # Skip this test
23 exit $KSELFTEST_SKIP_TEST
24 fi
25
26 # Figure out which test to run from our script name.
27 test=$(basename $0 .sh)
28 # Look up details about the test from master list of LKDTM tests.
29 line=$(grep -E '^#?'"$test"'\b' tests.txt)
30 if [ -z "$line" ]; then
31 echo "Skipped: missing test '$test' in tests.txt"
32 exit $KSELFTEST_SKIP_TEST
33 fi
34 # Check that the test is known to LKDTM.
35 if ! grep -E -q '^'"$test"'$' "$TRIGGER" ; then
36 echo "Skipped: test '$test' missing in $TRIGGER!"
37 exit $KSELFTEST_SKIP_TEST
38 fi
39
40 # Extract notes/expected output from test list.
41 test=$(echo "$line" | cut -d" " -f1)
42 if echo "$line" | grep -q ' ' ; then
43 expect=$(echo "$line" | cut -d" " -f2-)
44 else
45 expect=""
46 fi
47
48 # If the test is commented out, report a skip
49 if echo "$test" | grep -q '^#' ; then
50 test=$(echo "$test" | cut -c2-)
51 if [ -z "$expect" ]; then
52 expect="crashes entire system"
53 fi
54 echo "Skipping $test: $expect"
55 exit $KSELFTEST_SKIP_TEST
56 fi
57
58 # If no expected output given, assume an Oops with back trace is success.
59 repeat=1
60 if [ -z "$expect" ]; then
61 expect="call trace:"
62 else
63 if echo "$expect" | grep -q '^repeat:' ; then
64 repeat=$(echo "$expect" | cut -d' ' -f1 | cut -d: -f2)
65 expect=$(echo "$expect" | cut -d' ' -f2-)
66 fi
67 fi
68
69 # Prepare log for report checking
70 LOG=$(mktemp --tmpdir -t lkdtm-log-XXXXXX)
71 DMESG=$(mktemp --tmpdir -t lkdtm-dmesg-XXXXXX)
72 cleanup() {
73 rm -f "$LOG" "$DMESG"
74 }
75 trap cleanup EXIT
76
77 # Reset WARN_ONCE counters so we trip it each time this runs.
78 if [ -w $CLEAR_ONCE ] ; then
79 echo 1 > $CLEAR_ONCE
80 fi
81
82 # Save existing dmesg so we can detect new content below
83 dmesg > "$DMESG"
84
85 # Since the kernel is likely killing the process writing to the trigger
86 # file, it must not be the script's shell itself. i.e. we cannot do:
87 # echo "$test" >"$TRIGGER"
88 # Instead, use "cat" to take the signal. Since the shell will yell about
89 # the signal that killed the subprocess, we must ignore the failure and
90 # continue. However we don't silence stderr since there might be other
91 # useful details reported there in the case of other unexpected conditions.
92 for i in $(seq 1 $repeat); do
93 echo "$test" | cat >"$TRIGGER" || true
94 done
95
96 # Record and dump the results
97 dmesg | comm --nocheck-order -13 "$DMESG" - > "$LOG" || true
98
99 cat "$LOG"
100 # Check for expected output
101 if grep -E -qi "$expect" "$LOG" ; then
102 echo "$test: saw '$expect': ok"
103 exit 0
104 else
105 if grep -E -qi XFAIL: "$LOG" ; then
106 echo "$test: saw 'XFAIL': [SKIP]"
107 exit $KSELFTEST_SKIP_TEST
108 else
109 echo "$test: missing '$expect': [FAIL]"
110 exit 1
111 fi
112 fi
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