mirror of https://github.com/google/oss-fuzz.git
[infra] Enable bad build checks once again. (#838)
* [infra] Enable bad build checks once again. * Minor typo. * [bad_example] Update build flags for reproducing bad instrumentation scenario. * [bad_example] split bad/no instrumentation case into two different ones. * Use new approach for partial instrumentation detection + do that only for libFuzzer. * Rename bad_example_bad_instrumentation into bad_example_partial_instrumentation. * Calculate number of broken targets and fail if 10+% are broken. * Multiprocess madness. * Always run all checks and store all errors + clean up the code and add comments * Add special handling for the projects with very small fuzz targets. * Remove unnecessary semicolon. * Address review comments. * Address more review comments, small refactoring.
This commit is contained in:
Max Moroz
GitHub
parent
ad80480393
commit
4df2262466
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@ -1,4 +1,4 @@
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#!/bin/bash -ux
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#!/bin/bash -u
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# Copyright 2017 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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@ -15,56 +15,65 @@
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#
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################################################################################
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# Verify that the given fuzzer has proper coverage instrumentation.
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# A minimal number of runs to test fuzz target with a non-empty input.
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MIN_NUMBER_OF_RUNS=4
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# The "example" target has 73 with ASan, 65 with UBSan, and 6648 with MSan.
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# Real world targets have greater values (arduinojson: 407, zlib: 664).
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THRESHOLD_FOR_NUMBER_OF_EDGES=256
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# Threshold values for different sanitizers used by instrumentation checks.
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ASAN_CALLS_THRESHOLD_FOR_ASAN_BUILD=1000
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ASAN_CALLS_THRESHOLD_FOR_NON_ASAN_BUILD=0
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MSAN_CALLS_THRESHOLD_FOR_MSAN_BUILD=1000
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MSAN_CALLS_THRESHOLD_FOR_NON_MSAN_BUILD=0
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UBSAN_CALLS_THRESHOLD_FOR_UBSAN_BUILD=350
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UBSAN_CALLS_THRESHOLD_FOR_NON_UBSAN_BUILD=200
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# Verify that the given fuzz target has proper coverage instrumentation.
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function check_instrumentation {
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local FUZZER=$1
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local CHECK_FAILED=0
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local FUZZER_OUTPUT="/tmp/$(basename $FUZZER).output"
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if [[ "$FUZZING_ENGINE" = libfuzzer ]]; then
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CHECK_FAILED=$($FUZZER -max_total_time=4 2>&1 | egrep "ERROR: no interesting inputs were found. Is the code instrumented" -c)
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if (( $CHECK_FAILED > 0 )); then
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echo "BAD BUILD: the code does not seem to have coverage instrumentation."
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fi
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fi
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# honggfuzz is not fully integrated, avoid performing the following check.
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if [[ "$FUZZING_ENGINE" != honggfuzz ]]; then
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if (( $CHECK_FAILED == 0 )); then
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# The "example" target has 93 when built with ASan and 67 with UBSan. Real
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# targets have greater values (arduinojson: 413, libteken: 519, zlib: 586).
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local THRESHOLD_FOR_NUMBER_OF_EDGES=90
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if [[ $SANITIZER = undefined ]]; then
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THRESHOLD_FOR_NUMBER_OF_EDGES=65
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fi
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local NUMBER_OF_EDGES=$(sancov -print-coverage-pcs $FUZZER | wc -l)
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if (( $NUMBER_OF_EDGES < $THRESHOLD_FOR_NUMBER_OF_EDGES )); then
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echo "BAD BUILD: the code does not seem to have coverage instrumentation."
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CHECK_FAILED=1
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fi
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fi
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if [[ "$FUZZING_ENGINE" != libfuzzer ]]; then
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return
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fi
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# Store fuzz target's output into a temp file to be used for further checks.
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$FUZZER -runs=$MIN_NUMBER_OF_RUNS &>$FUZZER_OUTPUT
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CHECK_FAILED=$(egrep "ERROR: no interesting inputs were found. Is the code instrumented" -c $FUZZER_OUTPUT)
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if (( $CHECK_FAILED > 0 )); then
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exit 1
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echo "BAD BUILD: the target does not seem to have coverage instrumentation."
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# Bail out as the further check does not make any sense, there are 0 PCs.
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return 1
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fi
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local NUMBER_OF_EDGES=$(grep -Po "INFO: Loaded [[:digit:]]+ module.*\(.*counters\):[[:space:]]+\K[[:digit:]]+" $FUZZER_OUTPUT)
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if (( $NUMBER_OF_EDGES < $THRESHOLD_FOR_NUMBER_OF_EDGES )); then
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echo "BAD BUILD: the target seems to have only partial coverage instrumentation."
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fi
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}
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# Verify that the given fuzzer has been built properly and works as expected.
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# Verify that the given fuzz target has been built properly and works.
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function check_startup_crash {
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local FUZZER=$1
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local CHECK_PASSED=0
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if [[ "$FUZZING_ENGINE" = libfuzzer ]]; then
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CHECK_PASSED=$($FUZZER -runs=4 2>&1 | egrep "Done 4 runs" -c)
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CHECK_PASSED=$($FUZZER -runs=$MIN_NUMBER_OF_RUNS 2>&1 | egrep "Done $MIN_NUMBER_OF_RUNS runs" -c)
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else
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# TODO: add checks for another fuzzing engines if possible.
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CHECK_PASSED=1
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fi
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if (( $CHECK_PASSED == 0 )); then
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if [ "$CHECK_PASSED" -eq "0" ]; then
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echo "BAD BUILD: the fuzzer seems to have either startup crash or exit."
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exit 1
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fi
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}
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@ -75,26 +84,17 @@ function check_asan_build {
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local MSAN_CALLS=$3
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local UBSAN_CALLS=$4
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# Perform all the checks for more verbose error message.
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local CHECK_FAILED=0
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if (( $ASAN_CALLS < 1000 )); then
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# Perform all the checks for more detailed error message.
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if (( $ASAN_CALLS < $ASAN_CALLS_THRESHOLD_FOR_ASAN_BUILD )); then
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echo "BAD BUILD: $FUZZER does not seem to be compiled with ASan."
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CHECK_FAILED=1
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fi
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if (( $MSAN_CALLS > 0 )); then
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if (( $MSAN_CALLS > $MSAN_CALLS_THRESHOLD_FOR_NON_MSAN_BUILD )); then
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echo "BAD BUILD: ASan build of $FUZZER seems to be compiled with MSan."
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CHECK_FAILED=1
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fi
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if (( $UBSAN_CALLS > 250 )); then
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if (( $UBSAN_CALLS > $UBSAN_CALLS_THRESHOLD_FOR_NON_UBSAN_BUILD )); then
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echo "BAD BUILD: ASan build of $FUZZER seems to be compiled with UBSan."
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CHECK_FAILED=1
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fi
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if (( $CHECK_FAILED > 0 )); then
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exit 1
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fi
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}
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@ -105,26 +105,17 @@ function check_msan_build {
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local MSAN_CALLS=$3
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local UBSAN_CALLS=$4
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# Perform all the checks for more verbose error message.
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local CHECK_FAILED=0
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if (( $ASAN_CALLS > 0 )); then
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# Perform all the checks for more detailed error message.
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if (( $ASAN_CALLS > $ASAN_CALLS_THRESHOLD_FOR_NON_ASAN_BUILD )); then
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echo "BAD BUILD: MSan build of $FUZZER seems to be compiled with ASan."
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CHECK_FAILED=1
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fi
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if (( $MSAN_CALLS < 1000 )); then
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if (( $MSAN_CALLS < $MSAN_CALLS_THRESHOLD_FOR_MSAN_BUILD )); then
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echo "BAD BUILD: $FUZZER does not seem to be compiled with UBSan."
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CHECK_FAILED=1
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fi
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if (( $UBSAN_CALLS > 250 )); then
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if (( $UBSAN_CALLS > $UBSAN_CALLS_THRESHOLD_FOR_NON_UBSAN_BUILD )); then
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echo "BAD BUILD: MSan build of $FUZZER seems to be compiled with UBSan."
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CHECK_FAILED=1
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fi
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if (( $CHECK_FAILED > 0 )); then
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exit 1
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fi
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}
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@ -142,38 +133,28 @@ function check_ubsan_build {
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return 0
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fi
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# Perform all the checks for more verbose error message.
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local CHECK_FAILED=0
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if (( $ASAN_CALLS > 0 )); then
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# Perform all the checks for more detailed error message.
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if (( $ASAN_CALLS > $ASAN_CALLS_THRESHOLD_FOR_NON_ASAN_BUILD )); then
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echo "BAD BUILD: UBSan build of $FUZZER seems to be compiled with ASan."
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CHECK_FAILED=1
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fi
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if (( $MSAN_CALLS > 0 )); then
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if (( $MSAN_CALLS > $MSAN_CALLS_THRESHOLD_FOR_NON_MSAN_BUILD )); then
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echo "BAD BUILD: UBSan build of $FUZZER seems to be compiled with MSan."
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CHECK_FAILED=1
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fi
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if (( $UBSAN_CALLS < 250 )); then
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if (( $UBSAN_CALLS < $UBSAN_CALLS_THRESHOLD_FOR_UBSAN_BUILD )); then
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echo "BAD BUILD: $FUZZER does not seem to be compiled with UBSan."
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CHECK_FAILED=1
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fi
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if (( $CHECK_FAILED > 0 )); then
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exit 1
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fi
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}
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# Verify that the given fuzz target is compiled with correct sanitizer.
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function check_mixed_sanitizers {
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local FUZZER=$1
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local ASAN_CALLS=$(objdump -dC $FUZZER | egrep "callq\s+[0-9a-f]+\s+<__asan" -c)
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local MSAN_CALLS=$(objdump -dC $FUZZER | egrep "callq\s+[0-9a-f]+\s+<__msan" -c)
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local UBSAN_CALLS=$(objdump -dC $FUZZER | egrep "callq\s+[0-9a-f]+\s+<__ubsan" -c)
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local CHECK_FAILED=0
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if [[ "$SANITIZER" = address ]]; then
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check_asan_build $FUZZER $ASAN_CALLS $MSAN_CALLS $UBSAN_CALLS
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elif [[ "$SANITIZER" = memory ]]; then
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@ -186,7 +167,6 @@ function check_mixed_sanitizers {
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function main {
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local FUZZER=$1
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echo "INFO: performing bad build checks for $FUZZER"
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check_instrumentation $FUZZER
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check_mixed_sanitizers $FUZZER
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@ -199,6 +179,7 @@ if [ $# -ne 1 ]; then
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exit 1
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fi
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# Fuzz target path.
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FUZZER=$1
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main $FUZZER
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echo "INFO: $FUZZER has passed bad_build_check tests."
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@ -1,4 +1,4 @@
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#!/bin/bash -eu
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#!/bin/bash -u
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# Copyright 2016 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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@ -15,9 +15,24 @@
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#
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################################################################################
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# Test every fuzzer. Fails on first fuzzer failure.
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# Percentage threshold that needs to be reached for marking a build as failed.
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ALLOWED_BROKEN_TARGETS_PERCENTAGE=10
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N=0
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# Test all fuzz targets in the $OUT/ dir.
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TOTAL_TARGETS_COUNT=0
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# Number of CPUs available, this is needed for running tests in parallel.
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NPROC=$(nproc)
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# Directories where bad build check results will be written to.
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VALID_TARGETS_DIR="/tmp/valid_fuzz_targets"
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BROKEN_TARGETS_DIR="/tmp/broken_fuzz_targets"
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rm -rf $VALID_TARGETS_DIR
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rm -rf $BROKEN_TARGETS_DIR
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mkdir $VALID_TARGETS_DIR
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mkdir $BROKEN_TARGETS_DIR
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# Main loop that iterates through all fuzz targets and runs the check.
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for FUZZER_BINARY in $(find $OUT/ -executable -type f); do
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if file "$FUZZER_BINARY" | grep -v ELF > /dev/null 2>&1; then
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continue
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@ -31,8 +46,6 @@ for FUZZER_BINARY in $(find $OUT/ -executable -type f); do
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continue
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fi
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echo "testing $FUZZER"
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if [ "$SKIP_TEST_TARGET_RUN" != "1" ]; then
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if [[ "$FUZZING_ENGINE" = honggfuzz ]]; then
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timeout --preserve-status -s INT 20s run_fuzzer $FUZZER
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@ -44,14 +57,80 @@ for FUZZER_BINARY in $(find $OUT/ -executable -type f); do
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fi
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fi
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bad_build_check $FUZZER_BINARY
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N=$[$N+1]
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echo "INFO: performing bad build checks for $FUZZER_BINARY."
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LOG_PATH_FOR_BROKEN_TARGET="${BROKEN_TARGETS_DIR}/${FUZZER}"
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# Launch bad build check process in the background.
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bad_build_check $FUZZER_BINARY > $LOG_PATH_FOR_BROKEN_TARGET &
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# Count total number of fuzz targets being tested.
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TOTAL_TARGETS_COUNT=$[$TOTAL_TARGETS_COUNT+1]
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# Do not spawn more processes than the number of CPUs available.
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n_child_proc=$(jobs -p | wc -l)
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while [ "$n_child_proc" -eq "$NPROC" ]; do
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sleep 4
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n_child_proc=$(jobs -p | wc -l)
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done
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done
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if [ "$N" -eq "0" ]; then
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# Wait for background processes to finish.
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wait
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# Sanity check in case there are no fuzz targets in the $OUT/ dir.
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if [ "$TOTAL_TARGETS_COUNT" -eq "0" ]; then
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echo "ERROR: no fuzzers found in $OUT/"
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ls -al $OUT
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exit 1
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fi
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echo "$N fuzzers total"
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# An empty log file indicated that corresponding fuzz target is not broken.
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find $BROKEN_TARGETS_DIR -empty -exec mv {} $VALID_TARGETS_DIR \;
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# Calculate number of valid and broken fuzz targets.
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VALID_TARGETS_COUNT=$(ls $VALID_TARGETS_DIR | wc -l)
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BROKEN_TARGETS_COUNT=$(ls $BROKEN_TARGETS_DIR | wc -l)
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# Sanity check to make sure that bad build check doesn't skip any fuzz target.
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if [ "$TOTAL_TARGETS_COUNT" -ne "$[$VALID_TARGETS_COUNT+$BROKEN_TARGETS_COUNT]" ]; then
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echo "ERROR: bad_build_check seems to have a bug, total number of fuzz" \
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"does not match number of fuzz targets tested."
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echo "Total fuzz targets ($TOTAL_TARGETS_COUNT):"
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ls -al $OUT
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echo "Valid fuzz targets ($VALID_TARGETS_COUNT):"
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ls -al $VALID_TARGETS_DIR
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echo "Total fuzz targets ($BROKEN_TARGETS_COUNT):"
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ls -al $BROKEN_TARGETS_DIR
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exit 1
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fi
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# Build info about all broken fuzz targets (if any).
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if [ "$BROKEN_TARGETS_COUNT" -gt "0" ]; then
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echo "Broken fuzz targets ($BROKEN_TARGETS_COUNT):"
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for target in $(ls $BROKEN_TARGETS_DIR); do
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echo "${target}:"
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cat ${BROKEN_TARGETS_DIR}/${target}
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done
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fi
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# Calculate the percentage of broken fuzz targets and make the finel decision.
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BROKEN_TARGETS_PERCENTAGE=$[$BROKEN_TARGETS_COUNT*100/$TOTAL_TARGETS_COUNT]
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if [ "$BROKEN_TARGETS_PERCENTAGE" -gt "$ALLOWED_BROKEN_TARGETS_PERCENTAGE" ]; then
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echo "ERROR: $BROKEN_TARGETS_PERCENTAGE% of fuzz targets seem to be broken." \
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"See the list above for a detailed information."
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# TODO: figure out how to not fail the "special" cases handled below. Those
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# are from "example" and "c-ares" projects and are too small targets to pass.
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if [ "$(ls $OUT/do_stuff_fuzzer $OUT/ares_*_fuzzer 2>/dev/null | wc -l)" -gt "0" ]; then
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exit 0
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fi
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exit 1
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else
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echo "$TOTAL_TARGETS_COUNT fuzzers total, $BROKEN_TARGETS_COUNT seem to be" \
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"broken ($BROKEN_TARGETS_PERCENTAGE%)."
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exit 0
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fi
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@ -195,27 +195,43 @@ def get_build_steps(project_yaml, dockerfile_path):
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env.append('OUT=' + out)
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env.append('MSAN_LIBS_PATH=/workspace/msan')
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# To disable running of all fuzz targets while doing |test_all| step, as
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# that step is currently being used for performing bad build checks only.
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env.append('SKIP_TEST_TARGET_RUN=1')
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workdir = workdir_from_dockerfile(dockerfile_path)
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if not workdir:
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workdir = '/src'
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build_steps.append({
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build_steps.extend([
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# compile
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'name': image,
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'env': env,
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'args': [
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'bash',
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'-c',
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# Remove /out to break loudly when a build script incorrectly uses
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# /out instead of $OUT.
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# `cd /src && cd {workdir}` (where {workdir} is parsed from the
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# Dockerfile). Container Builder overrides our workdir so we need to add
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# this step to set it back.
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# We also remove /work and /src to save disk space after a step.
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# Container Builder doesn't pass --rm to docker run yet.
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'rm -r /out && cd /src && cd {1} && mkdir -p {0} && compile && rm -rf /work && rm -rf /src'.format(out, workdir),
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],
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})
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{'name': image,
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'env': env,
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'args': [
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'bash',
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'-c',
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# Remove /out to break loudly when a build script incorrectly uses
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# /out instead of $OUT.
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# `cd /src && cd {workdir}` (where {workdir} is parsed from the
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# Dockerfile). Container Builder overrides our workdir so we need to add
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# this step to set it back.
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# We also remove /work and /src to save disk space after a step.
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# Container Builder doesn't pass --rm to docker run yet.
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'rm -r /out && cd /src && cd {1} && mkdir -p {0} && compile && rm -rf /work && rm -rf /src'.format(out, workdir),
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],
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},
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# test binaries
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{'name': 'gcr.io/oss-fuzz-base/base-runner',
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'env': env,
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'args': [
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'bash',
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'-c',
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# Verify that fuzzers have been built properly and are not broken.
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# TODO(mmoroz): raise a notification if not passing the tests.
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'test_all'
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],
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},
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])
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if sanitizer == 'memory':
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# Patch dynamic libraries to use instrumented ones.
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@ -28,21 +28,34 @@ if [[ $SANITIZER = *coverage* ]] || [[ $SANITIZER = *profile* ]]; then
|
|||
fi
|
||||
|
||||
|
||||
# Testcase 3. Ignore the flags provided by OSS-Fuzz.
|
||||
# Testcase 3. Partially ignore the flags provided by OSS-Fuzz.
|
||||
################################################################################
|
||||
export CFLAGS_ORIG="$CFLAGS"
|
||||
export CFLAGS="-O1"
|
||||
export CXXFLAGS_ORIG="$CXXFLAGS"
|
||||
export CXXFLAGS="-O1 -stdlib=libc++"
|
||||
|
||||
./configure
|
||||
make -j$(nproc) clean
|
||||
make -j$(nproc) all
|
||||
|
||||
$CXX -fsanitize=$SANITIZER $CXXFLAGS_ORIG -std=c++11 -I. \
|
||||
$SRC/bad_example_fuzzer.cc -o $OUT/bad_example_partial_instrumentation \
|
||||
-lFuzzingEngine ./libz.a
|
||||
|
||||
|
||||
# Testcase 4. Completely ignore the flags provided by OSS-Fuzz.
|
||||
################################################################################
|
||||
./configure
|
||||
make -j$(nproc) clean
|
||||
make -j$(nproc) all
|
||||
|
||||
$CXX -fsanitize=$SANITIZER $CXXFLAGS -std=c++11 -I. \
|
||||
$SRC/bad_example_fuzzer.cc -o $OUT/bad_example_no_instrumentation \
|
||||
-lFuzzingEngine ./libz.a
|
||||
|
||||
|
||||
# Testcase 4. Enable multiple sanitizers.
|
||||
# Testcase 5. Enable multiple sanitizers.
|
||||
################################################################################
|
||||
# Add UBSan to ASan or MSan build. Add ASan to UBSan build.
|
||||
EXTRA_SANITIZER="undefined"
|
||||
|
|
@ -50,8 +63,8 @@ if [[ $SANITIZER = *undefined* ]]; then
|
|||
EXTRA_SANITIZER="address"
|
||||
fi
|
||||
|
||||
export CFLAGS="-O1 -fsanitize=$SANITIZER,$EXTRA_SANITIZER -fsanitize-coverage=trace-pc-guard,trace-cmp"
|
||||
export CXXFLAGS="-O1 -fsanitize=$SANITIZER,$EXTRA_SANITIZER -fsanitize-coverage=trace-pc-guard,trace-cmp -stdlib=libc++"
|
||||
export CFLAGS="$CFLAGS_ORIG -fsanitize=$EXTRA_SANITIZER"
|
||||
export CXXFLAGS="$CXXFLAGS_ORIG -fsanitize=$EXTRA_SANITIZER"
|
||||
|
||||
./configure
|
||||
make -j$(nproc) clean
|
||||
|
|
|
|||
Loading…
Reference in New Issue