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Replace module fd with memfd if possible

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topjohnwu 2021-10-28 00:26:18 -07:00
parent 34c36984e9
commit 8bd0c44e83
1 changed files with 25 additions and 0 deletions
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25
native/jni/core/module.cpp
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@ -726,6 +726,31 @@ static void collect_modules(bool open_zygisk) {
info.name = entry->d_name;
modules->push_back(info);
});
if (zygisk_enabled) {
bool use_memfd = true;
auto convert_to_memfd = [&](int fd) -> int {
if (fd < 0)
return -1;
if (use_memfd) {
int memfd = syscall(__NR_memfd_create, "jit-cache", MFD_CLOEXEC);
if (memfd >= 0) {
xsendfile(memfd, fd, nullptr, INT_MAX);
close(fd);
return memfd;
} else {
// memfd_create failed, just use what we had
use_memfd = false;
}
}
return fd;
};
std::for_each(modules->begin(), modules->end(), [&](module_info &info) {
info.z32 = convert_to_memfd(info.z32);
#if defined(__LP64__)
info.z64 = convert_to_memfd(info.z64);
#endif
});
}
}
void handle_modules() {