3472e52fc2
Moves away from crufty char* operations to std::string utility methods, including android::base methods for splitting/parsing. Rewrite of how Process handles scanning procfs for filesystem references; now uses fts(3) for more sane traversal. Replace sscanf() with new FindValue() method, also has unit tests. Remove some unused methods. Switch almost everyone over to using modern logging library. Test: cts-tradefed run commandAndExit cts-dev -m CtsOsTestCases -t android.os.storage.cts.StorageManagerTest Test: cts-tradefed run commandAndExit cts-dev --abi armeabi-v7a -m CtsAppSecurityHostTestCases -t android.appsecurity.cts.AdoptableHostTest Bug: 67041047 Change-Id: I70dc512f21459d1e25b187f24289002b2c7bc7af
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/*
|
|
* Copyright (C) 2008 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 <stdio.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <fts.h>
|
|
#include <dirent.h>
|
|
#include <ctype.h>
|
|
#include <pwd.h>
|
|
#include <stdlib.h>
|
|
#include <poll.h>
|
|
#include <sys/stat.h>
|
|
#include <signal.h>
|
|
|
|
#include <fstream>
|
|
#include <unordered_set>
|
|
|
|
#include <android-base/file.h>
|
|
#include <android-base/parseint.h>
|
|
#include <android-base/strings.h>
|
|
#include <android-base/stringprintf.h>
|
|
#include <android-base/logging.h>
|
|
|
|
#include "Process.h"
|
|
|
|
using android::base::StringPrintf;
|
|
|
|
namespace android {
|
|
namespace vold {
|
|
|
|
static bool checkMaps(const std::string& path, const std::string& prefix) {
|
|
bool found = false;
|
|
std::ifstream infile(path);
|
|
std::string line;
|
|
while (std::getline(infile, line)) {
|
|
std::string::size_type pos = line.find('/');
|
|
if (pos != std::string::npos) {
|
|
line = line.substr(pos);
|
|
if (android::base::StartsWith(line, prefix.c_str())) {
|
|
LOG(WARNING) << "Found map " << path << " referencing " << line;
|
|
found = true;
|
|
}
|
|
}
|
|
}
|
|
return found;
|
|
}
|
|
|
|
static bool checkSymlink(const std::string& path, const std::string& prefix) {
|
|
std::string res;
|
|
if (android::base::Readlink(path, &res)) {
|
|
if (android::base::StartsWith(res, prefix.c_str())) {
|
|
LOG(WARNING) << "Found symlink " << path << " referencing " << res;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
int KillProcessesWithOpenFiles(const std::string& prefix, int signal) {
|
|
std::unordered_set<pid_t> pids;
|
|
|
|
auto proc_d = std::unique_ptr<DIR, int (*)(DIR*)>(opendir("/proc"), closedir);
|
|
if (!proc_d) {
|
|
PLOG(ERROR) << "Failed to open proc";
|
|
return -1;
|
|
}
|
|
|
|
struct dirent* proc_de;
|
|
while ((proc_de = readdir(proc_d.get())) != nullptr) {
|
|
// We only care about valid PIDs
|
|
pid_t pid;
|
|
if (proc_de->d_type != DT_DIR) continue;
|
|
if (!android::base::ParseInt(proc_de->d_name, &pid)) continue;
|
|
|
|
// Look for references to prefix
|
|
bool found = false;
|
|
auto path = StringPrintf("/proc/%d", pid);
|
|
found |= checkMaps(path + "/maps", prefix);
|
|
found |= checkSymlink(path + "/cwd", prefix);
|
|
found |= checkSymlink(path + "/root", prefix);
|
|
found |= checkSymlink(path + "/exe", prefix);
|
|
|
|
auto fd_path = path + "/fd";
|
|
auto fd_d = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(fd_path.c_str()), closedir);
|
|
if (!fd_d) {
|
|
PLOG(WARNING) << "Failed to open " << fd_path;
|
|
} else {
|
|
struct dirent* fd_de;
|
|
while ((fd_de = readdir(fd_d.get())) != nullptr) {
|
|
if (fd_de->d_type != DT_LNK) continue;
|
|
found |= checkSymlink(fd_path + "/" + fd_de->d_name, prefix);
|
|
}
|
|
}
|
|
|
|
if (found) {
|
|
pids.insert(pid);
|
|
}
|
|
}
|
|
if (signal != 0) {
|
|
for (const auto& pid : pids) {
|
|
LOG(WARNING) << "Sending " << strsignal(signal) << " to " << pid;
|
|
kill(pid, signal);
|
|
}
|
|
}
|
|
return pids.size();
|
|
}
|
|
|
|
} // namespace vold
|
|
} // namespace android
|