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Fix make private before remount

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This commit is contained in:
vvb2060 2023-03-06 04:35:10 +08:00 committed by John Wu
parent 9555380818
commit 9e07eb592c
1 changed files with 15 additions and 14 deletions
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29
native/src/core/bootstages.cpp
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@ -40,17 +40,28 @@ static bool mount_mirror(const std::string_view from, const std::string_view to)
// because of MS_NOUSER
!mount(from.data(), to.data(), nullptr, MS_BIND | MS_REC, nullptr) &&
// make mirror dir as a private mount so that it won't be affected by magic mount
!xmount("", to.data(), nullptr, MS_PRIVATE | MS_REC, nullptr);
!xmount(nullptr, to.data(), nullptr, MS_PRIVATE | MS_REC, nullptr);
}
static void mount_mirrors() {
LOGI("* Prepare worker\n");
LOGI("* Mounting mirrors\n");
// Bind remount module root to clear nosuid
if (access(SECURE_DIR, F_OK) == 0 || (SDK_INT < 24 && xmkdir(SECURE_DIR, 0700))) {
auto dest = MAGISKTMP + "/" MODULEMNT;
xmount(MODULEROOT, dest.data(), nullptr, MS_BIND, nullptr);
xmount(nullptr, dest.data(), nullptr, MS_REMOUNT | MS_BIND, nullptr);
xmount(nullptr, dest.data(), nullptr, MS_PRIVATE, nullptr);
chmod(SECURE_DIR, 0700);
restorecon();
}
// Prepare worker
auto worker_dir = MAGISKTMP + "/" WORKERDIR;
xmount("worker", worker_dir.data(), "tmpfs", 0, "mode=755");
xmount(nullptr, worker_dir.data(), nullptr, MS_PRIVATE, nullptr);
LOGI("* Mounting mirrors\n");
// recursively bind mount / to mirror dir
// Recursively bind mount / to mirror dir
if (auto mirror_dir = MAGISKTMP + "/" MIRRDIR; !mount_mirror("/", mirror_dir)) {
LOGI("fallback to mount subtree\n");
// rootfs may fail, fallback to bind mount each mount point
@ -68,16 +79,6 @@ static void mount_mirrors() {
}
}
}
LOGI("* Mounting module root\n");
if (access(SECURE_DIR, F_OK) == 0 || (SDK_INT < 24 && xmkdir(SECURE_DIR, 0700))) {
if (auto dest = MAGISKTMP + "/" MODULEMNT; mount_mirror(MODULEROOT, dest)) {
xmount(nullptr, dest.data(), nullptr, MS_REMOUNT | MS_BIND, nullptr);
restorecon();
chmod(SECURE_DIR, 0700);
}
}
}
static bool magisk_env() {