tools/testing/selftests/lkdtm/run.sh

   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 KSELFTEST_SKIP_TEST=4
  12
  13 # Verify we have LKDTM available in the kernel.
  14 if [ ! -r $TRIGGER ] ; then
  15         /sbin/modprobe -q lkdtm || true
  16         if [ ! -r $TRIGGER ] ; then
  17                 echo "Cannot find $TRIGGER (missing CONFIG_LKDTM?)"
  18         else
  19                 echo "Cannot write $TRIGGER (need to run as root?)"
  20         fi
  21         # Skip this test
  22         exit $KSELFTEST_SKIP_TEST
  23 fi
  24
  25 # Figure out which test to run from our script name.
  26 test=$(basename $0 .sh)
  27 # Look up details about the test from master list of LKDTM tests.
  28 line=$(egrep '^#?'"$test"'\b' tests.txt)
  29 if [ -z "$line" ]; then
  30         echo "Skipped: missing test '$test' in tests.txt"
  31         exit $KSELFTEST_SKIP_TEST
  32 fi
  33 # Check that the test is known to LKDTM.
  34 if ! egrep -q '^'"$test"'$' "$TRIGGER" ; then
  35         echo "Skipped: test '$test' missing in $TRIGGER!"
  36         exit $KSELFTEST_SKIP_TEST
  37 fi
  38
  39 # Extract notes/expected output from test list.
  40 test=$(echo "$line" | cut -d" " -f1)
  41 if echo "$line" | grep -q ' ' ; then
  42         expect=$(echo "$line" | cut -d" " -f2-)
  43 else
  44         expect=""
  45 fi
  46
  47 # If the test is commented out, report a skip
  48 if echo "$test" | grep -q '^#' ; then
  49         test=$(echo "$test" | cut -c2-)
  50         if [ -z "$expect" ]; then
  51                 expect="crashes entire system"
  52         fi
  53         echo "Skipping $test: $expect"
  54         exit $KSELFTEST_SKIP_TEST
  55 fi
  56
  57 # If no expected output given, assume an Oops with back trace is success.
  58 if [ -z "$expect" ]; then
  59         expect="call trace:"
  60 fi
  61
  62 # Clear out dmesg for output reporting
  63 dmesg -c >/dev/null
  64
  65 # Prepare log for report checking
  66 LOG=$(mktemp --tmpdir -t lkdtm-XXXXXX)
  67 cleanup() {
  68         rm -f "$LOG"
  69 }
  70 trap cleanup EXIT
  71
  72 # Most shells yell about signals and we're expecting the "cat" process
  73 # to usually be killed by the kernel. So we have to run it in a sub-shell
  74 # and silence errors.
  75 ($SHELL -c 'cat <(echo '"$test"') >'"$TRIGGER" 2>/dev/null) || true
  76
  77 # Record and dump the results
  78 dmesg -c >"$LOG"
  79 cat "$LOG"
  80 # Check for expected output
  81 if egrep -qi "$expect" "$LOG" ; then
  82         echo "$test: saw '$expect': ok"
  83         exit 0
  84 else
  85         if egrep -qi XFAIL: "$LOG" ; then
  86                 echo "$test: saw 'XFAIL': [SKIP]"
  87                 exit $KSELFTEST_SKIP_TEST
  88         else
  89                 echo "$test: missing '$expect': [FAIL]"
  90                 exit 1
  91         fi
  92 fi