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Merge "Retry to get and mount CE data directory again" am: 5737120c84 am: 57fef24446

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Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1479477

Change-Id: I0096c214ff5417cb6a1e57ca57d4f0cf271a02e7
This commit is contained in:
Alan Stokes
2020-11-10 11:20:54 +00:00
committed by Automerger Merge Worker
parent 818c1642be 57fef24446
commit 27d58a289c
1 changed files with 40 additions and 6 deletions
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46
core/jni/com_android_internal_os_Zygote.cpp
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@@ -804,10 +804,14 @@ static void PrepareDirIfNotPresent(const std::string& dir, mode_t mode, uid_t ui
PrepareDir(dir, mode, uid, gid, fail_fn);
}
static bool BindMount(const std::string& source_dir, const std::string& target_dir) {
return !(TEMP_FAILURE_RETRY(mount(source_dir.c_str(), target_dir.c_str(), nullptr,
MS_BIND | MS_REC, nullptr)) == -1);
}
static void BindMount(const std::string& source_dir, const std::string& target_dir,
fail_fn_t fail_fn) {
if (TEMP_FAILURE_RETRY(mount(source_dir.c_str(), target_dir.c_str(), nullptr,
MS_BIND | MS_REC, nullptr)) == -1) {
if (!BindMount(source_dir, target_dir)) {
fail_fn(CREATE_ERROR("Failed to mount %s to %s: %s",
source_dir.c_str(), target_dir.c_str(), strerror(errno)));
}
@@ -1194,9 +1198,9 @@ static pid_t ForkCommon(JNIEnv* env, bool is_system_server,
// Create an app data directory over tmpfs overlayed CE / DE storage, and bind mount it
// from the actual app data directory in data mirror.
static void createAndMountAppData(std::string_view package_name,
static bool createAndMountAppData(std::string_view package_name,
std::string_view mirror_pkg_dir_name, std::string_view mirror_data_path,
std::string_view actual_data_path, fail_fn_t fail_fn) {
std::string_view actual_data_path, fail_fn_t fail_fn, bool call_fail_fn) {
char mirrorAppDataPath[PATH_MAX];
char actualAppDataPath[PATH_MAX];
@@ -1206,6 +1210,29 @@ static void createAndMountAppData(std::string_view package_name,
PrepareDir(actualAppDataPath, 0700, AID_ROOT, AID_ROOT, fail_fn);
// Bind mount from original app data directory in mirror.
if (call_fail_fn) {
BindMount(mirrorAppDataPath, actualAppDataPath, fail_fn);
} else if(!BindMount(mirrorAppDataPath, actualAppDataPath)) {
ALOGW("Failed to mount %s to %s: %s",
mirrorAppDataPath, actualAppDataPath, strerror(errno));
return false;
}
return true;
}
// There is an app data directory over tmpfs overlaid CE / DE storage
// bind mount it from the actual app data directory in data mirror.
static void mountAppData(std::string_view package_name,
std::string_view mirror_pkg_dir_name, std::string_view mirror_data_path,
std::string_view actual_data_path, fail_fn_t fail_fn) {
char mirrorAppDataPath[PATH_MAX];
char actualAppDataPath[PATH_MAX];
snprintf(mirrorAppDataPath, PATH_MAX, "%s/%s", mirror_data_path.data(),
mirror_pkg_dir_name.data());
snprintf(actualAppDataPath, PATH_MAX, "%s/%s", actual_data_path.data(), package_name.data());
// Bind mount from original app data directory in mirror.
BindMount(mirrorAppDataPath, actualAppDataPath, fail_fn);
}
@@ -1284,10 +1311,17 @@ static void isolateAppDataPerPackage(int userId, std::string_view package_name,
snprintf(mirrorCePath, PATH_MAX, "%s/%d", mirrorCeParent, userId);
snprintf(mirrorDePath, PATH_MAX, "/data_mirror/data_de/%s/%d", volume_uuid.data(), userId);
createAndMountAppData(package_name, package_name, mirrorDePath, actualDePath, fail_fn);
createAndMountAppData(package_name, package_name, mirrorDePath, actualDePath, fail_fn,
true /*call_fail_fn*/);
std::string ce_data_path = getAppDataDirName(mirrorCePath, package_name, ce_data_inode, fail_fn);
createAndMountAppData(package_name, ce_data_path, mirrorCePath, actualCePath, fail_fn);
if (!createAndMountAppData(package_name, ce_data_path, mirrorCePath, actualCePath, fail_fn,
false /*call_fail_fn*/)) {
// CE might unlocks and the name is decrypted
// get the name and mount again
ce_data_path=getAppDataDirName(mirrorCePath, package_name, ce_data_inode, fail_fn);
mountAppData(package_name, ce_data_path, mirrorCePath, actualCePath, fail_fn);
}
}
// Relabel directory