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[libFuzzer] use __sanitizer_set_report_fd with -close_fd_mask. This allows us to keep asan reports when closing target's stderr

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271053 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2016-05-27 21:46:22 +00:00
parent a31d45bb57
commit dc4065fcc1
3 changed files with 11 additions and 4 deletions
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5
docs/LibFuzzer.rst
View File

@ -273,9 +273,8 @@ The most important command line options are:
If 1 (default) and if LeakSanitizer is enabled
try to detect memory leaks during fuzzing (i.e. not only at shut down).
``-close_fd_mask``
Indicate output streams to close at startup. Be careful, this will also
remove diagnostic output from the tools in use; for example the messages
AddressSanitizer_ sends to ``stderr``/``stdout`` will also be lost.
Indicate output streams to close at startup. Be careful, this will
remove diagnostic output from target code (e.g. messages on assert failure).
- 0 (default): close neither ``stdout`` nor ``stderr``
- 1 : close ``stdout``

6
lib/Fuzzer/FuzzerIO.cpp
View File

@ -18,6 +18,10 @@
#include <cstdarg>
#include <cstdio>
extern "C" {
__attribute__((weak)) void __sanitizer_set_report_fd(void *);
}
namespace fuzzer {
static FILE *OutputFile = stderr;
@ -122,6 +126,8 @@ void DupAndCloseStderr() {
FILE *NewOutputFile = fdopen(OutputFd, "w");
if (NewOutputFile) {
OutputFile = NewOutputFile;
if (__sanitizer_set_report_fd)
__sanitizer_set_report_fd(reinterpret_cast<void*>(OutputFd));
close(2);
}
}

4
lib/Fuzzer/test/fuzzer.test
View File

@ -11,7 +11,9 @@ RUN: LLVMFuzzer-SimpleTest -only_ascii=1 2>&1
RUN: LLVMFuzzer-SimpleCmpTest -max_total_time=1 2>&1 | FileCheck %s --check-prefix=MaxTotalTime
MaxTotalTime: Done {{.*}} runs in {{.}} second(s)
RUN: not LLVMFuzzer-NullDerefTest 2>&1 | FileCheck %s --check-prefix=NullDerefTest
RUN: not LLVMFuzzer-NullDerefTest 2>&1 | FileCheck %s --check-prefix=NullDerefTest
RUN: not LLVMFuzzer-NullDerefTest -close_fd_mask=3 2>&1 | FileCheck %s --check-prefix=NullDerefTest
NullDerefTest: ERROR: AddressSanitizer: SEGV on unknown address
NullDerefTest: Test unit written to ./crash-
RUN: not LLVMFuzzer-NullDerefTest -artifact_prefix=ZZZ 2>&1 | FileCheck %s --check-prefix=NullDerefTestPrefix
NullDerefTestPrefix: Test unit written to ZZZcrash-