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[perf-prof] Make sure filenames are correctly null-terminated.

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JS script names in debug info entries need to be null-terminated, the
terminator included in the length. However, SeqOneByteString's GetChars
returns raw pointer that's not null terminated.

Bug: chromium:1159164
Change-Id: Id00f72dc831fa1ae48a458a1d4476ada4730be54
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2593345
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Cr-Commit-Position: refs/heads/master@{#71795}
This commit is contained in:
Pierre Langlois 2020-12-16 12:47:07 +00:00 committed by Commit Bot
parent 9aaf874a1c
commit 3650b36542
1 changed files with 7 additions and 6 deletions
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13
src/diagnostics/perf-jit.cc
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@ -111,6 +111,8 @@ const char PerfJitLogger::kFilenameFormatString[] = "./jit-%d.dump";
// Extra padding for the PID in the filename
const int PerfJitLogger::kFilenameBufferPadding = 16;
static const char kStringTerminator[] = "\0";
base::LazyRecursiveMutex PerfJitLogger::file_mutex_;
// The following static variables are protected by PerfJitLogger::file_mutex_.
uint64_t PerfJitLogger::reference_count_ = 0;
@ -259,8 +261,6 @@ void PerfJitLogger::LogRecordedBuffer(const wasm::WasmCode* code,
void PerfJitLogger::WriteJitCodeLoadEntry(const uint8_t* code_pointer,
uint32_t code_size, const char* name,
int name_length) {
static const char string_terminator[] = "\0";
PerfJitCodeLoad code_load;
code_load.event_ = PerfJitCodeLoad::kLoad;
code_load.size_ = sizeof(code_load) + name_length + 1 + code_size;
@ -277,7 +277,7 @@ void PerfJitLogger::WriteJitCodeLoadEntry(const uint8_t* code_pointer,
LogWriteBytes(reinterpret_cast<const char*>(&code_load), sizeof(code_load));
LogWriteBytes(name, name_length);
LogWriteBytes(string_terminator, 1);
LogWriteBytes(kStringTerminator, 1);
LogWriteBytes(reinterpret_cast<const char*>(code_pointer), code_size);
}
@ -388,7 +388,8 @@ void PerfJitLogger::LogWriteDebugInfo(Handle<Code> code,
std::unique_ptr<char[]> name_storage;
Vector<const char> name_string = GetScriptName(info, &name_storage, no_gc);
LogWriteBytes(name_string.begin(),
static_cast<uint32_t>(name_string.size()) + 1);
static_cast<uint32_t>(name_string.size()));
LogWriteBytes(kStringTerminator, 1);
}
char padding_bytes[8] = {0};
LogWriteBytes(padding_bytes, padding);
@ -453,8 +454,8 @@ void PerfJitLogger::LogWriteDebugInfo(const wasm::WasmCode* code) {
entry.column_ = 1;
LogWriteBytes(reinterpret_cast<const char*>(&entry), sizeof(entry));
std::string name_string = source_map->GetFilename(offset);
LogWriteBytes(name_string.c_str(),
static_cast<int>(name_string.size() + 1));
LogWriteBytes(name_string.c_str(), static_cast<int>(name_string.size()));
LogWriteBytes(kStringTerminator, 1);
}
char padding_bytes[8] = {0};