Merge "Avoid thread cache in unwinder." into sc-dev
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index ea9d333..af71fe6 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -2265,3 +2265,81 @@
}
return LP_METADATA_DEFAULT_PARTITION_NAME;
}
+
+bool fs_mgr_create_canonical_mount_point(const std::string& mount_point) {
+ auto saved_errno = errno;
+ auto ok = true;
+ auto created_mount_point = !mkdir(mount_point.c_str(), 0755);
+ std::string real_mount_point;
+ if (!Realpath(mount_point, &real_mount_point)) {
+ ok = false;
+ PERROR << "failed to realpath(" << mount_point << ")";
+ } else if (mount_point != real_mount_point) {
+ ok = false;
+ LERROR << "mount point is not canonical: realpath(" << mount_point << ") -> "
+ << real_mount_point;
+ }
+ if (!ok && created_mount_point) {
+ rmdir(mount_point.c_str());
+ }
+ errno = saved_errno;
+ return ok;
+}
+
+bool fs_mgr_mount_overlayfs_fstab_entry(const FstabEntry& entry) {
+ auto overlayfs_valid_result = fs_mgr_overlayfs_valid();
+ if (overlayfs_valid_result == OverlayfsValidResult::kNotSupported) {
+ LERROR << __FUNCTION__ << "(): kernel does not support overlayfs";
+ return false;
+ }
+
+#if ALLOW_ADBD_DISABLE_VERITY == 0
+ // Allowlist the mount point if user build.
+ static const std::vector<const std::string> kAllowedPaths = {
+ "/odm", "/odm_dlkm", "/oem", "/product", "/system_ext", "/vendor", "/vendor_dlkm",
+ };
+ static const std::vector<const std::string> kAllowedPrefixes = {
+ "/mnt/product/",
+ "/mnt/vendor/",
+ };
+ if (std::none_of(kAllowedPaths.begin(), kAllowedPaths.end(),
+ [&entry](const auto& path) -> bool {
+ return entry.mount_point == path ||
+ StartsWith(entry.mount_point, path + "/");
+ }) &&
+ std::none_of(kAllowedPrefixes.begin(), kAllowedPrefixes.end(),
+ [&entry](const auto& prefix) -> bool {
+ return entry.mount_point != prefix &&
+ StartsWith(entry.mount_point, prefix);
+ })) {
+ LERROR << __FUNCTION__
+ << "(): mount point is forbidden on user build: " << entry.mount_point;
+ return false;
+ }
+#endif // ALLOW_ADBD_DISABLE_VERITY == 0
+
+ if (!fs_mgr_create_canonical_mount_point(entry.mount_point)) {
+ return false;
+ }
+
+ auto options = "lowerdir=" + entry.lowerdir;
+ if (overlayfs_valid_result == OverlayfsValidResult::kOverrideCredsRequired) {
+ options += ",override_creds=off";
+ }
+
+ // Use "overlay-" + entry.blk_device as the mount() source, so that adb-remout-test don't
+ // confuse this with adb remount overlay, whose device name is "overlay".
+ // Overlayfs is a pseudo filesystem, so the source device is a symbolic value and isn't used to
+ // back the filesystem. However the device name would be shown in /proc/mounts.
+ auto source = "overlay-" + entry.blk_device;
+ auto report = "__mount(source=" + source + ",target=" + entry.mount_point + ",type=overlay," +
+ options + ")=";
+ auto ret = mount(source.c_str(), entry.mount_point.c_str(), "overlay", MS_RDONLY | MS_NOATIME,
+ options.c_str());
+ if (ret) {
+ PERROR << report << ret;
+ return false;
+ }
+ LINFO << report << ret;
+ return true;
+}
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 853b24d..d0c89b9 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -127,15 +127,16 @@
}
fs_options.append(flag);
- if (entry->fs_type == "f2fs" && StartsWith(flag, "reserve_root=")) {
- std::string arg;
- if (auto equal_sign = flag.find('='); equal_sign != std::string::npos) {
- arg = flag.substr(equal_sign + 1);
- }
- if (!ParseInt(arg, &entry->reserved_size)) {
- LWARNING << "Warning: reserve_root= flag malformed: " << arg;
- } else {
- entry->reserved_size <<= 12;
+ if (auto equal_sign = flag.find('='); equal_sign != std::string::npos) {
+ const auto arg = flag.substr(equal_sign + 1);
+ if (entry->fs_type == "f2fs" && StartsWith(flag, "reserve_root=")) {
+ if (!ParseInt(arg, &entry->reserved_size)) {
+ LWARNING << "Warning: reserve_root= flag malformed: " << arg;
+ } else {
+ entry->reserved_size <<= 12;
+ }
+ } else if (StartsWith(flag, "lowerdir=")) {
+ entry->lowerdir = std::move(arg);
}
}
}
@@ -298,8 +299,6 @@
if (!ParseByteCount(arg, &entry->zram_backingdev_size)) {
LWARNING << "Warning: zram_backingdev_size= flag malformed: " << arg;
}
- } else if (StartsWith(flag, "lowerdir=")) {
- entry->lowerdir = arg;
} else {
LWARNING << "Warning: unknown flag: " << flag;
}
diff --git a/fs_mgr/fs_mgr_overlayfs.cpp b/fs_mgr/fs_mgr_overlayfs.cpp
index 9a94d79..4d32bda 100644
--- a/fs_mgr/fs_mgr_overlayfs.cpp
+++ b/fs_mgr/fs_mgr_overlayfs.cpp
@@ -92,14 +92,6 @@
return false;
}
-bool fs_mgr_overlayfs_mount_fstab_entry(const std::string&, const std::string&) {
- return false;
-}
-
-std::vector<std::string> fs_mgr_overlayfs_required_devices(Fstab*) {
- return {};
-}
-
bool fs_mgr_overlayfs_setup(const char*, const char*, bool* change, bool) {
if (change) *change = false;
return false;
@@ -1299,18 +1291,6 @@
}
}
-bool fs_mgr_overlayfs_mount_fstab_entry(const std::string& lowers,
- const std::string& mount_point) {
- if (fs_mgr_overlayfs_invalid()) return false;
-
- std::string aux = "lowerdir=" + lowers + ",override_creds=off";
- auto rc = mount("overlay", mount_point.c_str(), "overlay", MS_RDONLY | MS_NOATIME, aux.c_str());
-
- if (rc == 0) return true;
-
- return false;
-}
-
bool fs_mgr_overlayfs_mount_all(Fstab* fstab) {
auto ret = false;
if (fs_mgr_overlayfs_invalid()) return ret;
diff --git a/fs_mgr/fs_mgr_vendor_overlay.cpp b/fs_mgr/fs_mgr_vendor_overlay.cpp
index 830f0dd..1372511 100644
--- a/fs_mgr/fs_mgr_vendor_overlay.cpp
+++ b/fs_mgr/fs_mgr_vendor_overlay.cpp
@@ -92,7 +92,7 @@
}
auto report = "__mount(source=overlay,target="s + vendor_mount_point + ",type=overlay," +
options + ")=";
- auto ret = mount("overlay", vendor_mount_point.c_str(), "overlay", MS_RDONLY | MS_RELATIME,
+ auto ret = mount("overlay", vendor_mount_point.c_str(), "overlay", MS_RDONLY | MS_NOATIME,
options.c_str());
if (ret) {
PERROR << report << ret;
diff --git a/fs_mgr/include/fs_mgr.h b/fs_mgr/include/fs_mgr.h
index 22c02cc..4d3ecc9 100644
--- a/fs_mgr/include/fs_mgr.h
+++ b/fs_mgr/include/fs_mgr.h
@@ -131,3 +131,12 @@
// Finds the dm_bow device on which this block device is stacked, or returns
// empty string
std::string fs_mgr_find_bow_device(const std::string& block_device);
+
+// Creates mount point if not already existed, and checks that mount point is a
+// canonical path that doesn't contain any symbolic link or /../.
+bool fs_mgr_create_canonical_mount_point(const std::string& mount_point);
+
+// Like fs_mgr_do_mount_one() but for overlayfs fstab entries.
+// Unlike fs_mgr_overlayfs, mount overlayfs without upperdir and workdir, so the
+// filesystem cannot be remount read-write.
+bool fs_mgr_mount_overlayfs_fstab_entry(const android::fs_mgr::FstabEntry& entry);
diff --git a/fs_mgr/include/fs_mgr_overlayfs.h b/fs_mgr/include/fs_mgr_overlayfs.h
index ac95ef5..6caab1f 100644
--- a/fs_mgr/include/fs_mgr_overlayfs.h
+++ b/fs_mgr/include/fs_mgr_overlayfs.h
@@ -27,8 +27,6 @@
android::fs_mgr::Fstab fs_mgr_overlayfs_candidate_list(const android::fs_mgr::Fstab& fstab);
bool fs_mgr_overlayfs_mount_all(android::fs_mgr::Fstab* fstab);
-bool fs_mgr_overlayfs_mount_fstab_entry (const std::string& lowers, const std::string& mount_point);
-std::vector<std::string> fs_mgr_overlayfs_required_devices(android::fs_mgr::Fstab* fstab);
bool fs_mgr_overlayfs_setup(const char* backing = nullptr, const char* mount_point = nullptr,
bool* change = nullptr, bool force = true);
bool fs_mgr_overlayfs_teardown(const char* mount_point = nullptr, bool* change = nullptr);
diff --git a/fs_mgr/tests/adb-remount-test.sh b/fs_mgr/tests/adb-remount-test.sh
index 242fa93..9542bc1 100755
--- a/fs_mgr/tests/adb-remount-test.sh
+++ b/fs_mgr/tests/adb-remount-test.sh
@@ -735,23 +735,46 @@
fi
}
+[ "USAGE: join_with <delimiter> <strings>
+
+Joins strings with delimiter" ]
+join_with() {
+ if [ "${#}" -lt 2 ]; then
+ echo
+ return
+ fi
+ local delimiter="${1}"
+ local result="${2}"
+ shift 2
+ for element in "${@}"; do
+ result+="${delimiter}${element}"
+ done
+ echo "${result}"
+}
+
[ "USAGE: skip_administrative_mounts [data] < /proc/mounts
Filters out all administrative (eg: sysfs) mounts uninteresting to the test" ]
skip_administrative_mounts() {
+ local exclude_filesystems=(
+ "overlay" "tmpfs" "none" "sysfs" "proc" "selinuxfs" "debugfs" "bpf"
+ "binfmt_misc" "cg2_bpf" "pstore" "tracefs" "adb" "mtp" "ptp" "devpts"
+ "ramdumpfs" "binder" "securityfs" "functionfs" "rootfs"
+ )
+ local exclude_devices=(
+ "\/sys\/kernel\/debug" "\/data\/media" "\/dev\/block\/loop[0-9]*"
+ "${exclude_filesystems[@]}"
+ )
+ local exclude_mount_points=(
+ "\/cache" "\/mnt\/scratch" "\/mnt\/vendor\/persist" "\/persist"
+ "\/metadata"
+ )
if [ "data" = "${1}" ]; then
- grep -v " /data "
- else
- cat -
- fi |
- grep -v \
- -e "^\(overlay\|tmpfs\|none\|sysfs\|proc\|selinuxfs\|debugfs\|bpf\) " \
- -e "^\(binfmt_misc\|cg2_bpf\|pstore\|tracefs\|adb\|mtp\|ptp\|devpts\) " \
- -e "^\(ramdumpfs\|binder\|/sys/kernel/debug\|securityfs\) " \
- -e " functionfs " \
- -e "^\(/data/media\|/dev/block/loop[0-9]*\) " \
- -e "^rootfs / rootfs rw," \
- -e " /\(cache\|mnt/scratch\|mnt/vendor/persist\|persist\|metadata\) "
+ exclude_mount_points+=("\/data")
+ fi
+ awk '$1 !~ /^('"$(join_with "|" "${exclude_devices[@]}")"')$/ &&
+ $2 !~ /^('"$(join_with "|" "${exclude_mount_points[@]}")"')$/ &&
+ $3 !~ /^('"$(join_with "|" "${exclude_filesystems[@]}")"')$/'
}
[ "USAGE: skip_unrelated_mounts < /proc/mounts
@@ -907,9 +930,11 @@
# Acquire list of system partitions
+# KISS (assume system partition mount point is "/<partition name>")
PARTITIONS=`adb_su cat /vendor/etc/fstab* </dev/null |
+ grep -v "^[#${SPACE}${TAB}]" |
skip_administrative_mounts |
- sed -n "s@^\([^ ${TAB}/][^ ${TAB}/]*\)[ ${TAB}].*[, ${TAB}]ro[, ${TAB}].*@\1@p" |
+ awk '$1 ~ /^[^\/]+$/ && "/"$1 == $2 && $4 ~ /(^|,)ro(,|$)/ { print $1 }' |
sort -u |
tr '\n' ' '`
PARTITIONS="${PARTITIONS:-system vendor}"
diff --git a/init/Android.bp b/init/Android.bp
index 98e62fe..7eeafa2 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -387,6 +387,7 @@
srcs: [
"devices_test.cpp",
+ "epoll_test.cpp",
"firmware_handler_test.cpp",
"init_test.cpp",
"keychords_test.cpp",
diff --git a/init/epoll.cpp b/init/epoll.cpp
index 17d63fa..74d8aac 100644
--- a/init/epoll.cpp
+++ b/init/epoll.cpp
@@ -38,11 +38,12 @@
return {};
}
-Result<void> Epoll::RegisterHandler(int fd, std::function<void()> handler, uint32_t events) {
+Result<void> Epoll::RegisterHandler(int fd, Handler handler, uint32_t events) {
if (!events) {
return Error() << "Must specify events";
}
- auto [it, inserted] = epoll_handlers_.emplace(fd, std::move(handler));
+ auto sp = std::make_shared<decltype(handler)>(std::move(handler));
+ auto [it, inserted] = epoll_handlers_.emplace(fd, std::move(sp));
if (!inserted) {
return Error() << "Cannot specify two epoll handlers for a given FD";
}
@@ -69,7 +70,7 @@
return {};
}
-Result<std::vector<std::function<void()>*>> Epoll::Wait(
+Result<std::vector<std::shared_ptr<Epoll::Handler>>> Epoll::Wait(
std::optional<std::chrono::milliseconds> timeout) {
int timeout_ms = -1;
if (timeout && timeout->count() < INT_MAX) {
@@ -81,9 +82,10 @@
if (num_events == -1) {
return ErrnoError() << "epoll_wait failed";
}
- std::vector<std::function<void()>*> pending_functions;
+ std::vector<std::shared_ptr<Handler>> pending_functions;
for (int i = 0; i < num_events; ++i) {
- pending_functions.emplace_back(reinterpret_cast<std::function<void()>*>(ev[i].data.ptr));
+ auto sp = *reinterpret_cast<std::shared_ptr<Handler>*>(ev[i].data.ptr);
+ pending_functions.emplace_back(std::move(sp));
}
return pending_functions;
diff --git a/init/epoll.h b/init/epoll.h
index c32a661..0df5289 100644
--- a/init/epoll.h
+++ b/init/epoll.h
@@ -22,6 +22,7 @@
#include <chrono>
#include <functional>
#include <map>
+#include <memory>
#include <optional>
#include <vector>
@@ -36,15 +37,17 @@
public:
Epoll();
+ typedef std::function<void()> Handler;
+
Result<void> Open();
- Result<void> RegisterHandler(int fd, std::function<void()> handler, uint32_t events = EPOLLIN);
+ Result<void> RegisterHandler(int fd, Handler handler, uint32_t events = EPOLLIN);
Result<void> UnregisterHandler(int fd);
- Result<std::vector<std::function<void()>*>> Wait(
+ Result<std::vector<std::shared_ptr<Handler>>> Wait(
std::optional<std::chrono::milliseconds> timeout);
private:
android::base::unique_fd epoll_fd_;
- std::map<int, std::function<void()>> epoll_handlers_;
+ std::map<int, std::shared_ptr<Handler>> epoll_handlers_;
};
} // namespace init
diff --git a/init/epoll_test.cpp b/init/epoll_test.cpp
new file mode 100644
index 0000000..9236cd5
--- /dev/null
+++ b/init/epoll_test.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "epoll.h"
+
+#include <sys/unistd.h>
+
+#include <unordered_set>
+
+#include <android-base/file.h>
+#include <gtest/gtest.h>
+
+namespace android {
+namespace init {
+
+std::unordered_set<void*> sValidObjects;
+
+class CatchDtor final {
+ public:
+ CatchDtor() { sValidObjects.emplace(this); }
+ CatchDtor(const CatchDtor&) { sValidObjects.emplace(this); }
+ ~CatchDtor() {
+ auto iter = sValidObjects.find(this);
+ if (iter != sValidObjects.end()) {
+ sValidObjects.erase(iter);
+ }
+ }
+};
+
+TEST(epoll, UnregisterHandler) {
+ Epoll epoll;
+ ASSERT_RESULT_OK(epoll.Open());
+
+ int fds[2];
+ ASSERT_EQ(pipe(fds), 0);
+
+ CatchDtor catch_dtor;
+ bool handler_invoked;
+ auto handler = [&, catch_dtor]() -> void {
+ auto result = epoll.UnregisterHandler(fds[0]);
+ ASSERT_EQ(result.ok(), !handler_invoked);
+ handler_invoked = true;
+ ASSERT_NE(sValidObjects.find((void*)&catch_dtor), sValidObjects.end());
+ };
+
+ epoll.RegisterHandler(fds[0], std::move(handler));
+
+ uint8_t byte = 0xee;
+ ASSERT_TRUE(android::base::WriteFully(fds[1], &byte, sizeof(byte)));
+
+ auto results = epoll.Wait({});
+ ASSERT_RESULT_OK(results);
+ ASSERT_EQ(results->size(), size_t(1));
+
+ for (const auto& function : *results) {
+ (*function)();
+ (*function)();
+ }
+ ASSERT_TRUE(handler_invoked);
+}
+
+} // namespace init
+} // namespace android
diff --git a/init/first_stage_mount.cpp b/init/first_stage_mount.cpp
index a733839..f5c10bb 100644
--- a/init/first_stage_mount.cpp
+++ b/init/first_stage_mount.cpp
@@ -331,12 +331,6 @@
if (devices.empty()) {
return true;
}
- // excluding overlays
- for (auto iter = devices.begin(); iter != devices.end(); ) {
- if (*iter=="overlay") iter = devices.erase(iter);
- else iter++;
- }
-
return block_dev_init_.InitDevices(std::move(devices));
}
@@ -426,6 +420,10 @@
*end = begin + 1;
}
+ if (!fs_mgr_create_canonical_mount_point(begin->mount_point)) {
+ return false;
+ }
+
if (begin->fs_mgr_flags.logical) {
if (!fs_mgr_update_logical_partition(&(*begin))) {
return false;
@@ -548,6 +546,7 @@
continue;
}
+ // Handle overlayfs entries later.
if (current->fs_type == "overlay") {
++current;
continue;
@@ -577,6 +576,12 @@
current = end;
}
+ for (const auto& entry : fstab_) {
+ if (entry.fs_type == "overlay") {
+ fs_mgr_mount_overlayfs_fstab_entry(entry);
+ }
+ }
+
// If we don't see /system or / in the fstab, then we need to create an root entry for
// overlayfs.
if (!GetEntryForMountPoint(&fstab_, "/system") && !GetEntryForMountPoint(&fstab_, "/")) {
@@ -602,13 +607,6 @@
};
MapScratchPartitionIfNeeded(&fstab_, init_devices);
- for (auto current = fstab_.begin(); current != fstab_.end(); ) {
- if (current->fs_type == "overlay") {
- fs_mgr_overlayfs_mount_fstab_entry(current->lowerdir, current->mount_point);
- }
- ++current;
- }
-
fs_mgr_overlayfs_mount_all(&fstab_);
return true;
@@ -695,6 +693,10 @@
// Includes the partition names of fstab records.
// Notes that fstab_rec->blk_device has A/B suffix updated by fs_mgr when A/B is used.
for (const auto& fstab_entry : fstab_) {
+ // Skip pseudo filesystems.
+ if (fstab_entry.fs_type == "overlay") {
+ continue;
+ }
if (!fstab_entry.fs_mgr_flags.logical) {
devices->emplace(basename(fstab_entry.blk_device.c_str()));
}
@@ -757,6 +759,10 @@
if (fstab_entry.fs_mgr_flags.avb) {
need_dm_verity_ = true;
}
+ // Skip pseudo filesystems.
+ if (fstab_entry.fs_type == "overlay") {
+ continue;
+ }
if (fstab_entry.fs_mgr_flags.logical) {
// Don't try to find logical partitions via uevent regeneration.
logical_partitions.emplace(basename(fstab_entry.blk_device.c_str()));
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 1013d41..6e85da5 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -762,7 +762,7 @@
# profile file layout
mkdir /data/misc/profiles 0771 system system
mkdir /data/misc/profiles/cur 0771 system system
- mkdir /data/misc/profiles/ref 0770 system system
+ mkdir /data/misc/profiles/ref 0771 system system
mkdir /data/misc/profman 0770 system shell
mkdir /data/misc/gcov 0770 root root
mkdir /data/misc/installd 0700 root root