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tests: Set errno in FuzzedFileProvider. Implement seek(..., ..., SEEK_END).

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This commit is contained in:
practicalswift 2020-06-02 18:58:21 +00:00
parent b972913c33
commit af322c7494
1 changed files with 22 additions and 1 deletions
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23
src/test/fuzz/util.h
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@ -259,6 +259,16 @@ void SetFuzzedErrNo(FuzzedDataProvider& fuzzed_data_provider, const std::array<T
errno = fuzzed_data_provider.PickValueInArray(errnos);
}
/*
* Sets a fuzzed errno in the range [0, 133 (EHWPOISON)]. Can be used from functions emulating
* standard library functions that set errno, or in other contexts where the value of errno
* might be relevant for the execution path that will be taken.
*/
inline void SetFuzzedErrNo(FuzzedDataProvider& fuzzed_data_provider) noexcept
{
errno = fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 133);
}
/**
* Returns a byte vector of specified size regardless of the number of remaining bytes available
* from the fuzzer. Pads with zero value bytes if needed to achieve the specified size.
@ -345,6 +355,7 @@ public:
FILE* open()
{
SetFuzzedErrNo(m_fuzzed_data_provider);
if (m_fuzzed_data_provider.ConsumeBool()) {
return nullptr;
}
@ -386,6 +397,7 @@ public:
static ssize_t read(void* cookie, char* buf, size_t size)
{
FuzzedFileProvider* fuzzed_file = (FuzzedFileProvider*)cookie;
SetFuzzedErrNo(fuzzed_file->m_fuzzed_data_provider);
if (buf == nullptr || size == 0 || fuzzed_file->m_fuzzed_data_provider.ConsumeBool()) {
return fuzzed_file->m_fuzzed_data_provider.ConsumeBool() ? 0 : -1;
}
@ -404,6 +416,7 @@ public:
static ssize_t write(void* cookie, const char* buf, size_t size)
{
FuzzedFileProvider* fuzzed_file = (FuzzedFileProvider*)cookie;
SetFuzzedErrNo(fuzzed_file->m_fuzzed_data_provider);
const ssize_t n = fuzzed_file->m_fuzzed_data_provider.ConsumeIntegralInRange<ssize_t>(0, size);
if (AdditionOverflow(fuzzed_file->m_offset, (int64_t)n)) {
return fuzzed_file->m_fuzzed_data_provider.ConsumeBool() ? 0 : -1;
@ -414,8 +427,9 @@ public:
static int seek(void* cookie, int64_t* offset, int whence)
{
assert(whence == SEEK_SET || whence == SEEK_CUR); // SEEK_END not implemented yet.
assert(whence == SEEK_SET || whence == SEEK_CUR || whence == SEEK_END);
FuzzedFileProvider* fuzzed_file = (FuzzedFileProvider*)cookie;
SetFuzzedErrNo(fuzzed_file->m_fuzzed_data_provider);
int64_t new_offset = 0;
if (whence == SEEK_SET) {
new_offset = *offset;
@ -424,6 +438,12 @@ public:
return -1;
}
new_offset = fuzzed_file->m_offset + *offset;
} else if (whence == SEEK_END) {
const int64_t n = fuzzed_file->m_fuzzed_data_provider.ConsumeIntegralInRange<int64_t>(0, 4096);
if (AdditionOverflow(n, *offset)) {
return -1;
}
new_offset = n + *offset;
}
if (new_offset < 0) {
return -1;
@ -436,6 +456,7 @@ public:
static int close(void* cookie)
{
FuzzedFileProvider* fuzzed_file = (FuzzedFileProvider*)cookie;
SetFuzzedErrNo(fuzzed_file->m_fuzzed_data_provider);
return fuzzed_file->m_fuzzed_data_provider.ConsumeIntegralInRange<int>(-1, 0);
}
};