}
bool MemMap::Sync() {
- return msync(BaseBegin(), BaseSize(), MS_SYNC) == 0;
+ bool result;
+ if (redzone_size_ != 0) {
+ // To avoid valgrind errors, temporarily lift the lower-end noaccess protection before passing
+ // it to msync() as it only accepts page-aligned base address, and exclude the higher-end
+ // noaccess protection from the msync range. b/27552451.
+ uint8_t* base_begin = reinterpret_cast<uint8_t*>(base_begin_);
+ MEMORY_TOOL_MAKE_DEFINED(base_begin, begin_ - base_begin);
+ result = msync(BaseBegin(), End() - base_begin, MS_SYNC) == 0;
+ MEMORY_TOOL_MAKE_NOACCESS(base_begin, begin_ - base_begin);
+ } else {
+ result = msync(BaseBegin(), BaseSize(), MS_SYNC) == 0;
+ }
+ return result;
}
bool MemMap::Protect(int prot) {