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[libFuzzer] enable the failure-resistant merge by default (with trace-pc-guard only)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289772 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2016-12-15 06:21:21 +00:00
parent 9a24ed6ddc
commit abe2ee53b6
4 changed files with 31 additions and 27 deletions
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20
lib/Fuzzer/FuzzerDriver.cpp
View File

@ -15,6 +15,7 @@
#include "FuzzerIO.h"
#include "FuzzerMutate.h"
#include "FuzzerRandom.h"
#include "FuzzerTracePC.h"
#include <algorithm>
#include <atomic>
#include <chrono>
@ -493,17 +494,14 @@ int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
if (Flags.merge) {
if (Options.MaxLen == 0)
F->SetMaxInputLen(kMaxSaneLen);
F->Merge(*Inputs);
exit(0);
}
if (Flags.experimental_merge) {
if (Options.MaxLen == 0)
F->SetMaxInputLen(kMaxSaneLen);
if (Flags.merge_control_file)
F->CrashResistantMergeInternalStep(Flags.merge_control_file);
else
F->CrashResistantMerge(Args, *Inputs);
if (TPC.UsingTracePcGuard()) {
if (Flags.merge_control_file)
F->CrashResistantMergeInternalStep(Flags.merge_control_file);
else
F->CrashResistantMerge(Args, *Inputs);
} else {
F->Merge(*Inputs);
}
exit(0);
}

2
lib/Fuzzer/FuzzerFlags.def
View File

@ -37,8 +37,6 @@ FUZZER_FLAG_INT(help, 0, "Print help.")
FUZZER_FLAG_INT(merge, 0, "If 1, the 2-nd, 3-rd, etc corpora will be "
"merged into the 1-st corpus. Only interesting units will be taken. "
"This flag can be used to minimize a corpus.")
FUZZER_FLAG_INT(experimental_merge, 0, "Experimental crash-resistant, "
"may eventually replace -merge.")
FUZZER_FLAG_STRING(merge_control_file, "internal flag")
FUZZER_FLAG_INT(minimize_crash, 0, "If 1, minimizes the provided"
" crash input. Use with -runs=N or -max_total_time=N to limit "

4
lib/Fuzzer/FuzzerMerge.cpp
View File

@ -176,8 +176,8 @@ void Fuzzer::CrashResistantMergeInternalStep(const std::string &CFPath) {
std::ofstream OF(CFPath, std::ofstream::out | std::ofstream::app);
for (size_t i = M.FirstNotProcessedFile; i < M.Files.size(); i++) {
auto U = FileToVector(M.Files[i].Name);
if (U.size() > Options.MaxLen) {
U.resize(Options.MaxLen);
if (U.size() > MaxInputLen) {
U.resize(MaxInputLen);
U.shrink_to_fit();
}
std::ostringstream StartedLine;

32
lib/Fuzzer/test/merge.test
View File

@ -8,8 +8,8 @@ RUN: echo ..Z... > %tmp/T1/3
# T1 has 3 elements, T2 is empty.
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=CHECK1
CHECK1: === Minimizing the initial corpus of 3 units
CHECK1: === Merge: written 0 units
CHECK1: MERGE-OUTER: 3 files, 3 in the initial corpus
CHECK1: MERGE-OUTER: 0 new files with 0 new features added
RUN: echo ...Z.. > %tmp/T2/1
RUN: echo ....E. > %tmp/T2/2
@ -20,19 +20,27 @@ RUN: echo ..Z... > %tmp/T2/c
# T1 has 3 elements, T2 has 6 elements, only 3 are new.
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=CHECK2
CHECK2: === Minimizing the initial corpus of 3 units
CHECK2: === Merging extra 6 units
CHECK2: === Merge: written 3 units
CHECK2: MERGE-OUTER: 9 files, 3 in the initial corpus
CHECK2: MERGE-OUTER: 3 new files with 3 new features added
# Now, T1 has 6 units and T2 has no new interesting units.
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=CHECK3
CHECK3: === Minimizing the initial corpus of 6 units
CHECK3: === Merge: written 0 units
CHECK3: MERGE-OUTER: 12 files, 6 in the initial corpus
CHECK3: MERGE-OUTER: 0 new files with 0 new features added
# Check that we respect max_len during the merge and don't crash.
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 -max_len=4
RUN: rm %tmp/T1/??*
RUN: echo looooooooong > %tmp/T2/looooooooong
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 -max_len=6 2>&1 | FileCheck %s --check-prefix=MAX_LEN
MAX_LEN: MERGE-OUTER: 3 new files
# Check that when merge fails we print an error message.
RUN: echo 'Hi!' > %tmp/T1/HiI
RUN: not LLVMFuzzer-NullDerefTest -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=MERGE_FAIL
MERGE_FAIL: NOTE: merge did not succeed due to a failure on one of the inputs.
# Check that merge tolerates failures.
RUN: rm %tmp/T1/??*
RUN: echo 'FUZZER' > %tmp/T2/FUZZER
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 2>&1 | FileCheck %s --check-prefix=MERGE_WITH_CRASH
MERGE_WITH_CRASH: MERGE-OUTER: succesfull in 2 attempt(s)
MERGE_WITH_CRASH: MERGE-OUTER: 3 new files
# Check that we actually limit the size with max_len
RUN: LLVMFuzzer-FullCoverageSetTest -merge=1 %tmp/T1 %tmp/T2 -max_len=5 2>&1 | FileCheck %s --check-prefix=MERGE_LEN5
MERGE_LEN5: MERGE-OUTER: succesfull in 1 attempt(s)