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Update mmap implementation

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Always map memory as writable, but private when read-only
This commit is contained in:
topjohnwu
2021-01-12 22:50:55 -08:00
parent 9a28dd4f6e
commit f2cb3c38fe
9 changed files with 58 additions and 73 deletions
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10
native/jni/init/mount.cpp
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@ -289,7 +289,7 @@ success:
}
void RootFSInit::early_mount() {
self = raw_data::read("/init");
self = mmap_data::ro("/init");
LOGD("Restoring /init\n");
rename("/.backup/init", "/init");
@ -301,9 +301,9 @@ void SARBase::backup_files() {
if (access("/overlay.d", F_OK) == 0)
backup_folder("/overlay.d", overlays);
self = raw_data::read("/proc/self/exe");
self = mmap_data::ro("/proc/self/exe");
if (access("/.backup/.magisk", R_OK) == 0)
config = raw_data::read("/.backup/.magisk");
config = mmap_data::ro("/.backup/.magisk");
}
void SARBase::mount_system_root() {
@ -346,7 +346,7 @@ void SARInit::early_mount() {
switch_root("/system_root");
{
auto init = raw_data::mmap_ro("/init");
auto init = mmap_data::ro("/init");
is_two_stage = init.contains("selinux_setup");
}
LOGD("is_two_stage: [%d]\n", is_two_stage);
@ -383,7 +383,7 @@ void BaseInit::exec_init() {
static void patch_socket_name(const char *path) {
char rstr[16];
gen_rand_str(rstr, sizeof(rstr));
auto bin = raw_data::mmap_rw(path);
auto bin = mmap_data::rw(path);
bin.patch({ make_pair(MAIN_SOCKET, rstr) });
}