The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 1 | /* |
Mark Salyzyn | 154f460 | 2014-02-20 14:59:07 -0800 | [diff] [blame] | 2 | * Copyright (C) 2007-2014 The Android Open Source Project |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 17 | #include "devices.h" |
| 18 | |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 19 | #include <dirent.h> |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 20 | #include <errno.h> |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 21 | #include <fcntl.h> |
Daniel Leung | c0c1ffe | 2012-07-02 11:32:30 -0700 | [diff] [blame] | 22 | #include <fnmatch.h> |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 23 | #include <grp.h> |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 24 | #include <libgen.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 25 | #include <linux/netlink.h> |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 26 | #include <pwd.h> |
Olivier Bailly | b93e581 | 2010-11-17 11:47:23 -0800 | [diff] [blame] | 27 | #include <stddef.h> |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 28 | #include <stdio.h> |
| 29 | #include <stdlib.h> |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 30 | #include <string.h> |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 31 | #include <sys/sendfile.h> |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 32 | #include <sys/socket.h> |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 33 | #include <sys/time.h> |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 34 | #include <sys/un.h> |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 35 | #include <sys/wait.h> |
| 36 | #include <unistd.h> |
| 37 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 38 | #include <algorithm> |
James Hawkins | 588a2ca | 2016-02-18 14:52:46 -0800 | [diff] [blame] | 39 | #include <memory> |
Elliott Hughes | 290a228 | 2016-11-14 17:08:47 -0800 | [diff] [blame] | 40 | #include <thread> |
James Hawkins | 588a2ca | 2016-02-18 14:52:46 -0800 | [diff] [blame] | 41 | |
Biao Lu | dc84856 | 2016-01-28 16:10:54 +0800 | [diff] [blame] | 42 | #include <android-base/file.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 43 | #include <android-base/logging.h> |
Rob Herring | 6de783a | 2016-05-06 10:06:59 -0500 | [diff] [blame] | 44 | #include <android-base/stringprintf.h> |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 45 | #include <android-base/strings.h> |
Hung-ying Tyan | 99c4a8a | 2016-02-01 15:07:40 +0800 | [diff] [blame] | 46 | #include <android-base/unique_fd.h> |
Vernon Tang | 3f582e9 | 2011-04-25 13:08:17 +1000 | [diff] [blame] | 47 | #include <cutils/uevent.h> |
Tom Cherry | 3f5eaae5 | 2017-04-06 16:30:22 -0700 | [diff] [blame] | 48 | #include <private/android_filesystem_config.h> |
| 49 | #include <selinux/android.h> |
| 50 | #include <selinux/avc.h> |
| 51 | #include <selinux/label.h> |
| 52 | #include <selinux/selinux.h> |
Vernon Tang | 3f582e9 | 2011-04-25 13:08:17 +1000 | [diff] [blame] | 53 | |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 54 | #include "keyword_map.h" |
| 55 | #include "ueventd.h" |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 56 | #include "util.h" |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 57 | |
Stephen Smalley | e096e36 | 2012-06-11 13:37:39 -0400 | [diff] [blame] | 58 | extern struct selabel_handle *sehandle; |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 59 | |
Sandeep Patil | 35403eb | 2017-02-08 20:27:12 -0800 | [diff] [blame] | 60 | static android::base::unique_fd device_fd; |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 61 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 62 | Permissions::Permissions(const std::string& name, mode_t perm, uid_t uid, gid_t gid) |
| 63 | : name_(name), perm_(perm), uid_(uid), gid_(gid), prefix_(false), wildcard_(false) { |
| 64 | // If the first * is the last character, then we'll treat name_ as a prefix |
| 65 | // Otherwise, if a * is present, then we do a full fnmatch(). |
| 66 | auto wildcard_position = name_.find('*'); |
| 67 | if (wildcard_position == name_.length() - 1) { |
| 68 | prefix_ = true; |
| 69 | name_.pop_back(); |
| 70 | } else if (wildcard_position != std::string::npos) { |
| 71 | wildcard_ = true; |
Ting-Yuan Huang | 09bd41d | 2016-11-15 15:35:16 -0800 | [diff] [blame] | 72 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 73 | } |
| 74 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 75 | bool Permissions::Match(const std::string& path) const { |
| 76 | if (prefix_) { |
| 77 | return android::base::StartsWith(path, name_.c_str()); |
| 78 | } else if (wildcard_) { |
| 79 | return fnmatch(name_.c_str(), path.c_str(), FNM_PATHNAME) == 0; |
Colin Cross | 43d537e | 2014-07-02 13:08:13 -0700 | [diff] [blame] | 80 | } else { |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 81 | return path == name_; |
Colin Cross | 43d537e | 2014-07-02 13:08:13 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | return false; |
| 85 | } |
| 86 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 87 | bool SysfsPermissions::MatchWithSubsystem(const std::string& path, |
| 88 | const std::string& subsystem) const { |
| 89 | std::string path_basename = android::base::Basename(path); |
| 90 | if (name().find(subsystem) != std::string::npos) { |
| 91 | if (Match("/sys/class/" + subsystem + "/" + path_basename)) return true; |
| 92 | if (Match("/sys/bus/" + subsystem + "/devices/" + path_basename)) return true; |
Rob Herring | 6de783a | 2016-05-06 10:06:59 -0500 | [diff] [blame] | 93 | } |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 94 | return Match(path); |
Rob Herring | 6de783a | 2016-05-06 10:06:59 -0500 | [diff] [blame] | 95 | } |
Rob Herring | e5636a3 | 2016-05-06 12:28:48 -0500 | [diff] [blame] | 96 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 97 | void SysfsPermissions::SetPermissions(const std::string& path) const { |
| 98 | std::string attribute_file = path + "/" + attribute_; |
| 99 | LOG(INFO) << "fixup " << attribute_file << " " << uid() << " " << gid() << " " << std::oct |
| 100 | << perm(); |
| 101 | chown(attribute_file.c_str(), uid(), gid()); |
| 102 | chmod(attribute_file.c_str(), perm()); |
| 103 | } |
| 104 | |
| 105 | // TODO: Move these to be member variables of a future devices class. |
| 106 | std::vector<Permissions> dev_permissions; |
| 107 | std::vector<SysfsPermissions> sysfs_permissions; |
| 108 | |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 109 | bool ParsePermissionsLine(std::vector<std::string>&& args, std::string* err, bool is_sysfs) { |
| 110 | if (is_sysfs && args.size() != 5) { |
| 111 | *err = "/sys/ lines must have 5 entries"; |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | if (!is_sysfs && args.size() != 4) { |
| 116 | *err = "/dev/ lines must have 4 entries"; |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | auto it = args.begin(); |
| 121 | const std::string& name = *it++; |
| 122 | |
| 123 | std::string sysfs_attribute; |
| 124 | if (is_sysfs) sysfs_attribute = *it++; |
| 125 | |
| 126 | // args is now common to both sys and dev entries and contains: <perm> <uid> <gid> |
| 127 | std::string& perm_string = *it++; |
| 128 | char* end_pointer = 0; |
| 129 | mode_t perm = strtol(perm_string.c_str(), &end_pointer, 8); |
| 130 | if (end_pointer == nullptr || *end_pointer != '\0') { |
| 131 | *err = "invalid mode '" + perm_string + "'"; |
| 132 | return false; |
| 133 | } |
| 134 | |
| 135 | std::string& uid_string = *it++; |
| 136 | passwd* pwd = getpwnam(uid_string.c_str()); |
| 137 | if (!pwd) { |
| 138 | *err = "invalid uid '" + uid_string + "'"; |
| 139 | return false; |
| 140 | } |
| 141 | uid_t uid = pwd->pw_uid; |
| 142 | |
| 143 | std::string& gid_string = *it++; |
| 144 | struct group* grp = getgrnam(gid_string.c_str()); |
| 145 | if (!grp) { |
| 146 | *err = "invalid gid '" + gid_string + "'"; |
| 147 | return false; |
| 148 | } |
| 149 | gid_t gid = grp->gr_gid; |
| 150 | |
| 151 | if (is_sysfs) { |
| 152 | sysfs_permissions.emplace_back(name, sysfs_attribute, perm, uid, gid); |
| 153 | } else { |
| 154 | dev_permissions.emplace_back(name, perm, uid, gid); |
| 155 | } |
| 156 | return true; |
| 157 | } |
| 158 | |
| 159 | // TODO: Move this to be a member variable of a future devices class. |
| 160 | static std::vector<Subsystem> subsystems; |
| 161 | |
| 162 | std::string Subsystem::ParseDevPath(uevent* uevent) const { |
| 163 | std::string devname = devname_source_ == DevnameSource::DEVNAME_UEVENT_DEVNAME |
| 164 | ? uevent->device_name |
| 165 | : android::base::Basename(uevent->path); |
| 166 | |
| 167 | return dir_name_ + "/" + devname; |
| 168 | } |
| 169 | |
| 170 | bool SubsystemParser::ParseSection(std::vector<std::string>&& args, const std::string& filename, |
| 171 | int line, std::string* err) { |
| 172 | if (args.size() != 2) { |
| 173 | *err = "subsystems must have exactly one name"; |
| 174 | return false; |
| 175 | } |
| 176 | |
| 177 | if (std::find(subsystems.begin(), subsystems.end(), args[1]) != subsystems.end()) { |
| 178 | *err = "ignoring duplicate subsystem entry"; |
| 179 | return false; |
| 180 | } |
| 181 | |
| 182 | subsystem_.name_ = args[1]; |
| 183 | |
| 184 | return true; |
| 185 | } |
| 186 | |
| 187 | bool SubsystemParser::ParseDevName(std::vector<std::string>&& args, std::string* err) { |
| 188 | if (args[1] == "uevent_devname") { |
| 189 | subsystem_.devname_source_ = Subsystem::DevnameSource::DEVNAME_UEVENT_DEVNAME; |
| 190 | return true; |
| 191 | } |
| 192 | if (args[1] == "uevent_devpath") { |
| 193 | subsystem_.devname_source_ = Subsystem::DevnameSource::DEVNAME_UEVENT_DEVPATH; |
| 194 | return true; |
| 195 | } |
| 196 | |
| 197 | *err = "invalid devname '" + args[1] + "'"; |
| 198 | return false; |
| 199 | } |
| 200 | |
| 201 | bool SubsystemParser::ParseDirName(std::vector<std::string>&& args, std::string* err) { |
| 202 | if (args[1].front() != '/') { |
| 203 | *err = "dirname '" + args[1] + " ' does not start with '/'"; |
| 204 | return false; |
| 205 | } |
| 206 | |
| 207 | subsystem_.dir_name_ = args[1]; |
| 208 | return true; |
| 209 | } |
| 210 | |
| 211 | bool SubsystemParser::ParseLineSection(std::vector<std::string>&& args, int line, std::string* err) { |
| 212 | using OptionParser = |
| 213 | bool (SubsystemParser::*)(std::vector<std::string> && args, std::string * err); |
| 214 | static class OptionParserMap : public KeywordMap<OptionParser> { |
| 215 | private: |
| 216 | const Map& map() const override { |
| 217 | // clang-format off |
| 218 | static const Map option_parsers = { |
| 219 | {"devname", {1, 1, &SubsystemParser::ParseDevName}}, |
| 220 | {"dirname", {1, 1, &SubsystemParser::ParseDirName}}, |
| 221 | }; |
| 222 | // clang-format on |
| 223 | return option_parsers; |
| 224 | } |
| 225 | } parser_map; |
| 226 | |
| 227 | auto parser = parser_map.FindFunction(args, err); |
| 228 | |
| 229 | if (!parser) { |
| 230 | return false; |
| 231 | } |
| 232 | |
| 233 | return (this->*parser)(std::move(args), err); |
| 234 | } |
| 235 | |
| 236 | void SubsystemParser::EndSection() { |
| 237 | subsystems.emplace_back(std::move(subsystem_)); |
| 238 | } |
| 239 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 240 | static void fixup_sys_permissions(const std::string& upath, const std::string& subsystem) { |
Rob Herring | 6de783a | 2016-05-06 10:06:59 -0500 | [diff] [blame] | 241 | // upaths omit the "/sys" that paths in this list |
| 242 | // contain, so we prepend it... |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 243 | std::string path = "/sys" + upath; |
Rob Herring | 6de783a | 2016-05-06 10:06:59 -0500 | [diff] [blame] | 244 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 245 | for (const auto& s : sysfs_permissions) { |
| 246 | if (s.MatchWithSubsystem(path, subsystem)) s.SetPermissions(path); |
Rob Herring | e5636a3 | 2016-05-06 12:28:48 -0500 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | if (access(path.c_str(), F_OK) == 0) { |
Dmitry Shmidt | 7eed474 | 2016-07-28 13:55:39 -0700 | [diff] [blame] | 250 | LOG(VERBOSE) << "restorecon_recursive: " << path; |
Paul Lawrence | a8d8434 | 2016-11-14 15:40:18 -0800 | [diff] [blame] | 251 | restorecon(path.c_str(), SELINUX_ANDROID_RESTORECON_RECURSE); |
Rob Herring | e5636a3 | 2016-05-06 12:28:48 -0500 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 255 | static std::tuple<mode_t, uid_t, gid_t> get_device_permissions( |
| 256 | const std::string& path, const std::vector<std::string>& links) { |
| 257 | // Search the perms list in reverse so that ueventd.$hardware can override ueventd.rc. |
| 258 | for (auto it = dev_permissions.rbegin(); it != dev_permissions.rend(); ++it) { |
| 259 | if (it->Match(path) || std::any_of(links.begin(), links.end(), |
| 260 | [it](const auto& link) { return it->Match(link); })) { |
| 261 | return {it->perm(), it->uid(), it->gid()}; |
Colin Cross | 43d537e | 2014-07-02 13:08:13 -0700 | [diff] [blame] | 262 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 263 | } |
Colin Cross | 44b65d0 | 2010-04-20 14:32:50 -0700 | [diff] [blame] | 264 | /* Default if nothing found. */ |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 265 | return {0600, 0, 0}; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 268 | static void make_device(const std::string& path, int block, int major, int minor, |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 269 | const std::vector<std::string>& links) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 270 | dev_t dev; |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 271 | char *secontext = NULL; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 272 | |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 273 | auto [mode, uid, gid] = get_device_permissions(path, links); |
| 274 | mode |= (block ? S_IFBLK : S_IFCHR); |
Kenny Root | b5982bf | 2012-10-16 23:07:05 -0700 | [diff] [blame] | 275 | |
Sandeep Patil | ea23983 | 2017-02-03 07:51:55 -0800 | [diff] [blame] | 276 | if (sehandle) { |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 277 | std::vector<const char*> c_links; |
| 278 | for (const auto& link : links) { |
| 279 | c_links.emplace_back(link.c_str()); |
| 280 | } |
| 281 | c_links.emplace_back(nullptr); |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 282 | if (selabel_lookup_best_match(sehandle, &secontext, path.c_str(), &c_links[0], mode)) { |
Sandeep Patil | ea23983 | 2017-02-03 07:51:55 -0800 | [diff] [blame] | 283 | PLOG(ERROR) << "Device '" << path << "' not created; cannot find SELinux label"; |
| 284 | return; |
| 285 | } |
| 286 | setfscreatecon(secontext); |
Mihai Serban | 24a3cbf | 2016-04-25 18:22:27 +0300 | [diff] [blame] | 287 | } |
Kenny Root | b5982bf | 2012-10-16 23:07:05 -0700 | [diff] [blame] | 288 | |
Colin Cross | 17dcc5c | 2010-09-03 12:25:34 -0700 | [diff] [blame] | 289 | dev = makedev(major, minor); |
Nick Pelly | 6405c69 | 2010-01-21 18:13:39 -0800 | [diff] [blame] | 290 | /* Temporarily change egid to avoid race condition setting the gid of the |
| 291 | * device node. Unforunately changing the euid would prevent creation of |
| 292 | * some device nodes, so the uid has to be set with chown() and is still |
| 293 | * racy. Fixing the gid race at least fixed the issue with system_server |
| 294 | * opening dynamic input devices under the AID_INPUT gid. */ |
Tom Cherry | 0506b18 | 2017-02-23 13:46:09 -0800 | [diff] [blame] | 295 | if (setegid(gid)) { |
| 296 | PLOG(ERROR) << "setegid(" << gid << ") for " << path << " device failed"; |
| 297 | goto out; |
| 298 | } |
Mihai Serban | 24a3cbf | 2016-04-25 18:22:27 +0300 | [diff] [blame] | 299 | /* If the node already exists update its SELinux label to handle cases when |
| 300 | * it was created with the wrong context during coldboot procedure. */ |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 301 | if (mknod(path.c_str(), mode, dev) && (errno == EEXIST) && secontext) { |
William Roberts | 397de14 | 2016-06-02 09:53:44 -0700 | [diff] [blame] | 302 | char* fcon = nullptr; |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 303 | int rc = lgetfilecon(path.c_str(), &fcon); |
William Roberts | 397de14 | 2016-06-02 09:53:44 -0700 | [diff] [blame] | 304 | if (rc < 0) { |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 305 | PLOG(ERROR) << "Cannot get SELinux label on '" << path << "' device"; |
William Roberts | 397de14 | 2016-06-02 09:53:44 -0700 | [diff] [blame] | 306 | goto out; |
| 307 | } |
| 308 | |
| 309 | bool different = strcmp(fcon, secontext) != 0; |
| 310 | freecon(fcon); |
| 311 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 312 | if (different && lsetfilecon(path.c_str(), secontext)) { |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 313 | PLOG(ERROR) << "Cannot set '" << secontext << "' SELinux label on '" << path << "' device"; |
Mihai Serban | 24a3cbf | 2016-04-25 18:22:27 +0300 | [diff] [blame] | 314 | } |
| 315 | } |
William Roberts | 397de14 | 2016-06-02 09:53:44 -0700 | [diff] [blame] | 316 | |
| 317 | out: |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 318 | chown(path.c_str(), uid, -1); |
Tom Cherry | 0506b18 | 2017-02-23 13:46:09 -0800 | [diff] [blame] | 319 | if (setegid(AID_ROOT)) { |
| 320 | PLOG(FATAL) << "setegid(AID_ROOT) failed"; |
| 321 | } |
Kenny Root | b5982bf | 2012-10-16 23:07:05 -0700 | [diff] [blame] | 322 | |
Sandeep Patil | ea23983 | 2017-02-03 07:51:55 -0800 | [diff] [blame] | 323 | if (secontext) { |
| 324 | freecon(secontext); |
| 325 | setfscreatecon(NULL); |
| 326 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 329 | // TODO: Move this to be a member variable of a future devices class. |
| 330 | std::vector<std::string> platform_devices; |
Dima Zavin | f395c92 | 2013-03-06 16:23:57 -0800 | [diff] [blame] | 331 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 332 | // Given a path that may start with a platform device, find the length of the |
| 333 | // platform device prefix. If it doesn't start with a platform device, return false |
| 334 | bool find_platform_device(const std::string& path, std::string* out_path) { |
| 335 | out_path->clear(); |
| 336 | // platform_devices is searched backwards, since parents are added before their children, |
| 337 | // and we want to match as deep of a child as we can. |
| 338 | for (auto it = platform_devices.rbegin(); it != platform_devices.rend(); ++it) { |
| 339 | auto platform_device_path_length = it->length(); |
| 340 | if (platform_device_path_length < path.length() && |
| 341 | path[platform_device_path_length] == '/' && |
| 342 | android::base::StartsWith(path, it->c_str())) { |
| 343 | *out_path = *it; |
| 344 | return true; |
Colin Cross | fadb85e | 2011-03-30 18:32:12 -0700 | [diff] [blame] | 345 | } |
| 346 | } |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 347 | return false; |
Sandeep Patil | 35403eb | 2017-02-08 20:27:12 -0800 | [diff] [blame] | 348 | } |
| 349 | |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 350 | /* Given a path that may start with a PCI device, populate the supplied buffer |
| 351 | * with the PCI domain/bus number and the peripheral ID and return 0. |
| 352 | * If it doesn't start with a PCI device, or there is some error, return -1 */ |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 353 | static bool find_pci_device_prefix(const std::string& path, std::string* result) { |
| 354 | result->clear(); |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 355 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 356 | if (!android::base::StartsWith(path, "/devices/pci")) return false; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 357 | |
| 358 | /* Beginning of the prefix is the initial "pci" after "/devices/" */ |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 359 | std::string::size_type start = 9; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 360 | |
| 361 | /* End of the prefix is two path '/' later, capturing the domain/bus number |
| 362 | * and the peripheral ID. Example: pci0000:00/0000:00:1f.2 */ |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 363 | auto end = path.find('/', start); |
| 364 | if (end == std::string::npos) return false; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 365 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 366 | end = path.find('/', end + 1); |
| 367 | if (end == std::string::npos) return false; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 368 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 369 | auto length = end - start; |
| 370 | if (length <= 4) { |
| 371 | // The minimum string that will get to this check is 'pci/', which is malformed, |
| 372 | // so return false |
| 373 | return false; |
| 374 | } |
| 375 | |
| 376 | *result = path.substr(start, length); |
| 377 | return true; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 378 | } |
| 379 | |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 380 | /* Given a path that may start with a virtual block device, populate |
| 381 | * the supplied buffer with the virtual block device ID and return 0. |
| 382 | * If it doesn't start with a virtual block device, or there is some |
| 383 | * error, return -1 */ |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 384 | static bool find_vbd_device_prefix(const std::string& path, std::string* result) { |
| 385 | result->clear(); |
| 386 | |
| 387 | if (!android::base::StartsWith(path, "/devices/vbd-")) return false; |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 388 | |
| 389 | /* Beginning of the prefix is the initial "vbd-" after "/devices/" */ |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 390 | std::string::size_type start = 13; |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 391 | |
| 392 | /* End of the prefix is one path '/' later, capturing the |
| 393 | virtual block device ID. Example: 768 */ |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 394 | auto end = path.find('/', start); |
| 395 | if (end == std::string::npos) return false; |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 396 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 397 | auto length = end - start; |
| 398 | if (length == 0) return false; |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 399 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 400 | *result = path.substr(start, length); |
| 401 | return true; |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 402 | } |
| 403 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 404 | void parse_event(const char* msg, uevent* uevent) { |
| 405 | uevent->partition_num = -1; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 406 | uevent->major = -1; |
| 407 | uevent->minor = -1; |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 408 | // currently ignoring SEQNUM |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 409 | while(*msg) { |
| 410 | if(!strncmp(msg, "ACTION=", 7)) { |
| 411 | msg += 7; |
| 412 | uevent->action = msg; |
| 413 | } else if(!strncmp(msg, "DEVPATH=", 8)) { |
| 414 | msg += 8; |
| 415 | uevent->path = msg; |
| 416 | } else if(!strncmp(msg, "SUBSYSTEM=", 10)) { |
| 417 | msg += 10; |
| 418 | uevent->subsystem = msg; |
| 419 | } else if(!strncmp(msg, "FIRMWARE=", 9)) { |
| 420 | msg += 9; |
| 421 | uevent->firmware = msg; |
| 422 | } else if(!strncmp(msg, "MAJOR=", 6)) { |
| 423 | msg += 6; |
| 424 | uevent->major = atoi(msg); |
| 425 | } else if(!strncmp(msg, "MINOR=", 6)) { |
| 426 | msg += 6; |
| 427 | uevent->minor = atoi(msg); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 428 | } else if(!strncmp(msg, "PARTN=", 6)) { |
| 429 | msg += 6; |
| 430 | uevent->partition_num = atoi(msg); |
| 431 | } else if(!strncmp(msg, "PARTNAME=", 9)) { |
| 432 | msg += 9; |
| 433 | uevent->partition_name = msg; |
Wei Zhong | f97b887 | 2012-03-23 14:15:34 -0700 | [diff] [blame] | 434 | } else if(!strncmp(msg, "DEVNAME=", 8)) { |
| 435 | msg += 8; |
| 436 | uevent->device_name = msg; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 437 | } |
| 438 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 439 | // advance to after the next \0 |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 440 | while(*msg++) |
| 441 | ; |
| 442 | } |
| 443 | |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 444 | if (LOG_UEVENTS) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 445 | LOG(INFO) << "event { '" << uevent->action << "', '" << uevent->path << "', '" |
| 446 | << uevent->subsystem << "', '" << uevent->firmware << "', " << uevent->major |
| 447 | << ", " << uevent->minor << " }"; |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 448 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 451 | std::vector<std::string> get_character_device_symlinks(uevent* uevent) { |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 452 | std::string parent_device; |
| 453 | if (!find_platform_device(uevent->path, &parent_device)) return {}; |
Benoit Goby | d227863 | 2010-08-03 14:36:02 -0700 | [diff] [blame] | 454 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 455 | // skip path to the parent driver |
| 456 | std::string path = uevent->path.substr(parent_device.length()); |
Benoit Goby | d227863 | 2010-08-03 14:36:02 -0700 | [diff] [blame] | 457 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 458 | if (!android::base::StartsWith(path, "/usb")) return {}; |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 459 | |
| 460 | // skip root hub name and device. use device interface |
| 461 | // skip 3 slashes, including the first / by starting the search at the 1st character, not 0th. |
| 462 | // then extract what comes between the 3rd and 4th slash |
| 463 | // e.g. "/usb/usb_device/name/tty2-1:1.0" -> "name" |
| 464 | |
| 465 | std::string::size_type start = 0; |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 466 | start = path.find('/', start + 1); |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 467 | if (start == std::string::npos) return {}; |
| 468 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 469 | start = path.find('/', start + 1); |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 470 | if (start == std::string::npos) return {}; |
| 471 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 472 | auto end = path.find('/', start + 1); |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 473 | if (end == std::string::npos) return {}; |
| 474 | |
| 475 | start++; // Skip the first '/' |
| 476 | |
| 477 | auto length = end - start; |
| 478 | if (length == 0) return {}; |
| 479 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 480 | auto name_string = path.substr(start, length); |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 481 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 482 | std::vector<std::string> links; |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 483 | links.emplace_back("/dev/usb/" + uevent->subsystem + name_string); |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 484 | |
| 485 | mkdir("/dev/usb", 0755); |
Benoit Goby | d227863 | 2010-08-03 14:36:02 -0700 | [diff] [blame] | 486 | |
| 487 | return links; |
Benoit Goby | d227863 | 2010-08-03 14:36:02 -0700 | [diff] [blame] | 488 | } |
| 489 | |
Tom Cherry | c44f6a4 | 2017-04-05 15:58:31 -0700 | [diff] [blame] | 490 | // replaces any unacceptable characters with '_', the |
| 491 | // length of the resulting string is equal to the input string |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 492 | void sanitize_partition_name(std::string* string) { |
Tom Cherry | c44f6a4 | 2017-04-05 15:58:31 -0700 | [diff] [blame] | 493 | const char* accept = |
| 494 | "abcdefghijklmnopqrstuvwxyz" |
| 495 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 496 | "0123456789" |
| 497 | "_-."; |
| 498 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 499 | if (!string) return; |
Tom Cherry | c44f6a4 | 2017-04-05 15:58:31 -0700 | [diff] [blame] | 500 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 501 | std::string::size_type pos = 0; |
| 502 | while ((pos = string->find_first_not_of(accept, pos)) != std::string::npos) { |
| 503 | (*string)[pos] = '_'; |
Tom Cherry | c44f6a4 | 2017-04-05 15:58:31 -0700 | [diff] [blame] | 504 | } |
| 505 | } |
| 506 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 507 | std::vector<std::string> get_block_device_symlinks(uevent* uevent) { |
| 508 | std::string device; |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 509 | std::string type; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 510 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 511 | if (find_platform_device(uevent->path, &device)) { |
| 512 | // Skip /devices/platform or /devices/ if present |
| 513 | static const std::string devices_platform_prefix = "/devices/platform/"; |
| 514 | static const std::string devices_prefix = "/devices/"; |
| 515 | |
| 516 | if (android::base::StartsWith(device, devices_platform_prefix.c_str())) { |
| 517 | device = device.substr(devices_platform_prefix.length()); |
| 518 | } else if (android::base::StartsWith(device, devices_prefix.c_str())) { |
| 519 | device = device.substr(devices_prefix.length()); |
| 520 | } |
| 521 | |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 522 | type = "platform"; |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 523 | } else if (find_pci_device_prefix(uevent->path, &device)) { |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 524 | type = "pci"; |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 525 | } else if (find_vbd_device_prefix(uevent->path, &device)) { |
Jeremy Compostella | 937309d | 2017-03-03 16:27:29 +0100 | [diff] [blame] | 526 | type = "vbd"; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 527 | } else { |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 528 | return {}; |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 529 | } |
Dima Zavin | f395c92 | 2013-03-06 16:23:57 -0800 | [diff] [blame] | 530 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 531 | std::vector<std::string> links; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 532 | |
Sandeep Patil | 35403eb | 2017-02-08 20:27:12 -0800 | [diff] [blame] | 533 | LOG(VERBOSE) << "found " << type << " device " << device; |
Colin Cross | fadb85e | 2011-03-30 18:32:12 -0700 | [diff] [blame] | 534 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 535 | auto link_path = "/dev/block/" + type + "/" + device; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 536 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 537 | if (!uevent->partition_name.empty()) { |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 538 | std::string partition_name_sanitized(uevent->partition_name); |
| 539 | sanitize_partition_name(&partition_name_sanitized); |
| 540 | if (partition_name_sanitized != uevent->partition_name) { |
| 541 | LOG(VERBOSE) << "Linking partition '" << uevent->partition_name << "' as '" |
| 542 | << partition_name_sanitized << "'"; |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 543 | } |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 544 | links.emplace_back(link_path + "/by-name/" + partition_name_sanitized); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 545 | } |
| 546 | |
| 547 | if (uevent->partition_num >= 0) { |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 548 | links.emplace_back(link_path + "/by-num/p" + std::to_string(uevent->partition_num)); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 549 | } |
| 550 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 551 | auto last_slash = uevent->path.rfind('/'); |
| 552 | links.emplace_back(link_path + "/" + uevent->path.substr(last_slash + 1)); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 553 | |
| 554 | return links; |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 555 | } |
| 556 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 557 | static void make_link_init(const std::string& oldpath, const std::string& newpath) { |
| 558 | if (mkdir_recursive(dirname(newpath.c_str()), 0755)) { |
| 559 | PLOG(ERROR) << "Failed to create directory " << dirname(newpath.c_str()); |
| 560 | } |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 561 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 562 | if (symlink(oldpath.c_str(), newpath.c_str()) && errno != EEXIST) { |
| 563 | PLOG(ERROR) << "Failed to symlink " << oldpath << " to " << newpath; |
| 564 | } |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 567 | static void remove_link(const std::string& oldpath, const std::string& newpath) { |
| 568 | std::string path; |
| 569 | if (android::base::Readlink(newpath, &path) && path == oldpath) unlink(newpath.c_str()); |
Elliott Hughes | f39f7f1 | 2016-08-31 14:41:51 -0700 | [diff] [blame] | 570 | } |
| 571 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 572 | static void handle_device(const std::string& action, const std::string& devpath, int block, |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 573 | int major, int minor, const std::vector<std::string>& links) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 574 | if (action == "add") { |
| 575 | make_device(devpath, block, major, minor, links); |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 576 | for (const auto& link : links) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 577 | make_link_init(devpath, link); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 578 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 579 | } |
| 580 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 581 | if (action == "remove") { |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 582 | for (const auto& link : links) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 583 | remove_link(devpath, link); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 584 | } |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 585 | unlink(devpath.c_str()); |
Colin Cross | b0ab94b | 2010-04-08 16:16:20 -0700 | [diff] [blame] | 586 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 587 | } |
| 588 | |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 589 | void handle_platform_device_event(uevent* uevent) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 590 | if (uevent->action == "add") { |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 591 | platform_devices.emplace_back(uevent->path); |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 592 | } else if (uevent->action == "remove") { |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 593 | auto it = std::find(platform_devices.begin(), platform_devices.end(), uevent->path); |
| 594 | if (it != platform_devices.end()) platform_devices.erase(it); |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 595 | } |
Colin Cross | fadb85e | 2011-03-30 18:32:12 -0700 | [diff] [blame] | 596 | } |
| 597 | |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 598 | static void handle_block_device_event(uevent* uevent) { |
| 599 | // if it's not a /dev device, nothing to do |
| 600 | if (uevent->major < 0 || uevent->minor < 0) return; |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 601 | |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 602 | const char* base = "/dev/block/"; |
Stephen Smalley | e46f9d5 | 2012-01-13 08:48:47 -0500 | [diff] [blame] | 603 | make_dir(base, 0755); |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 604 | |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 605 | std::string name = android::base::Basename(uevent->path); |
| 606 | std::string devpath = base + name; |
| 607 | |
Tom Cherry | 2e344f9 | 2017-04-04 17:53:45 -0700 | [diff] [blame] | 608 | std::vector<std::string> links; |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 609 | if (android::base::StartsWith(uevent->path, "/devices")) { |
Andrew Boie | a885d04 | 2013-09-13 17:41:20 -0700 | [diff] [blame] | 610 | links = get_block_device_symlinks(uevent); |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 611 | } |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 612 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 613 | handle_device(uevent->action, devpath, 1, uevent->major, uevent->minor, links); |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 614 | } |
| 615 | |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 616 | static void handle_generic_device_event(uevent* uevent) { |
| 617 | // if it's not a /dev device, nothing to do |
| 618 | if (uevent->major < 0 || uevent->minor < 0) return; |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 619 | |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 620 | std::string devpath; |
Greg Hackmann | 3312aa8 | 2013-11-18 15:24:40 -0800 | [diff] [blame] | 621 | |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 622 | if (android::base::StartsWith(uevent->subsystem, "usb")) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 623 | if (uevent->subsystem == "usb") { |
| 624 | if (!uevent->device_name.empty()) { |
| 625 | devpath = "/dev/" + uevent->device_name; |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 626 | } else { |
| 627 | // This imitates the file system that would be created |
| 628 | // if we were using devfs instead. |
| 629 | // Minors are broken up into groups of 128, starting at "001" |
| 630 | int bus_id = uevent->minor / 128 + 1; |
| 631 | int device_id = uevent->minor % 128 + 1; |
| 632 | devpath = android::base::StringPrintf("/dev/bus/usb/%03d/%03d", bus_id, device_id); |
| 633 | } |
Tom Cherry | 3fa4673 | 2017-04-11 14:19:50 -0700 | [diff] [blame] | 634 | } else { |
| 635 | // ignore other USB events |
| 636 | return; |
| 637 | } |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 638 | } else if (auto subsystem = std::find(subsystems.begin(), subsystems.end(), uevent->subsystem); |
| 639 | subsystem != subsystems.end()) { |
| 640 | devpath = subsystem->ParseDevPath(uevent); |
Tom Cherry | 780a71e | 2017-04-04 16:30:40 -0700 | [diff] [blame] | 641 | } else { |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 642 | devpath = "/dev/" + android::base::Basename(uevent->path); |
Tom Cherry | 780a71e | 2017-04-04 16:30:40 -0700 | [diff] [blame] | 643 | } |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 644 | |
Tom Cherry | fe06205 | 2017-04-24 16:59:05 -0700 | [diff] [blame^] | 645 | mkdir_recursive(android::base::Dirname(devpath), 0755); |
| 646 | |
Tom Cherry | 780a71e | 2017-04-04 16:30:40 -0700 | [diff] [blame] | 647 | auto links = get_character_device_symlinks(uevent); |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 648 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 649 | handle_device(uevent->action, devpath, 0, uevent->major, uevent->minor, links); |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | static void handle_device_event(struct uevent *uevent) |
| 653 | { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 654 | if (uevent->action == "add" || uevent->action == "change" || uevent->action == "online") { |
Tom Cherry | cc054c9 | 2017-04-05 17:55:46 -0700 | [diff] [blame] | 655 | fixup_sys_permissions(uevent->path, uevent->subsystem); |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 656 | } |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 657 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 658 | if (uevent->subsystem == "block") { |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 659 | handle_block_device_event(uevent); |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 660 | } else if (uevent->subsystem == "platform") { |
Colin Cross | fadb85e | 2011-03-30 18:32:12 -0700 | [diff] [blame] | 661 | handle_platform_device_event(uevent); |
Colin Cross | eb5ba83 | 2011-03-30 17:37:17 -0700 | [diff] [blame] | 662 | } else { |
| 663 | handle_generic_device_event(uevent); |
| 664 | } |
| 665 | } |
| 666 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 667 | static void load_firmware(uevent* uevent, const std::string& root, |
| 668 | int fw_fd, size_t fw_size, |
| 669 | int loading_fd, int data_fd) { |
| 670 | // Start transfer. |
| 671 | android::base::WriteFully(loading_fd, "1", 1); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 672 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 673 | // Copy the firmware. |
| 674 | int rc = sendfile(data_fd, fw_fd, nullptr, fw_size); |
| 675 | if (rc == -1) { |
| 676 | PLOG(ERROR) << "firmware: sendfile failed { '" << root << "', '" << uevent->firmware << "' }"; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 679 | // Tell the firmware whether to abort or commit. |
| 680 | const char* response = (rc != -1) ? "0" : "-1"; |
| 681 | android::base::WriteFully(loading_fd, response, strlen(response)); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 682 | } |
| 683 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 684 | static int is_booting() { |
Brian Swetland | 8d48c8e | 2011-03-24 15:45:30 -0700 | [diff] [blame] | 685 | return access("/dev/.booting", F_OK) == 0; |
| 686 | } |
| 687 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 688 | static void process_firmware_event(uevent* uevent) { |
Brian Swetland | 8d48c8e | 2011-03-24 15:45:30 -0700 | [diff] [blame] | 689 | int booting = is_booting(); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 690 | |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 691 | LOG(INFO) << "firmware: loading '" << uevent->firmware << "' for '" << uevent->path << "'"; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 692 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 693 | std::string root = "/sys" + uevent->path; |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 694 | std::string loading = root + "/loading"; |
| 695 | std::string data = root + "/data"; |
| 696 | |
| 697 | android::base::unique_fd loading_fd(open(loading.c_str(), O_WRONLY|O_CLOEXEC)); |
| 698 | if (loading_fd == -1) { |
| 699 | PLOG(ERROR) << "couldn't open firmware loading fd for " << uevent->firmware; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 700 | return; |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 701 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 702 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 703 | android::base::unique_fd data_fd(open(data.c_str(), O_WRONLY|O_CLOEXEC)); |
| 704 | if (data_fd == -1) { |
| 705 | PLOG(ERROR) << "couldn't open firmware data fd for " << uevent->firmware; |
| 706 | return; |
| 707 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 708 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 709 | static const char* firmware_dirs[] = {"/etc/firmware/", "/vendor/firmware/", |
| 710 | "/firmware/image/"}; |
| 711 | |
Brian Swetland | 8d48c8e | 2011-03-24 15:45:30 -0700 | [diff] [blame] | 712 | try_loading_again: |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 713 | for (size_t i = 0; i < arraysize(firmware_dirs); i++) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 714 | std::string file = firmware_dirs[i] + uevent->firmware; |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 715 | android::base::unique_fd fw_fd(open(file.c_str(), O_RDONLY|O_CLOEXEC)); |
| 716 | struct stat sb; |
| 717 | if (fw_fd != -1 && fstat(fw_fd, &sb) != -1) { |
| 718 | load_firmware(uevent, root, fw_fd, sb.st_size, loading_fd, data_fd); |
| 719 | return; |
Benoit Goby | 609d882 | 2010-11-09 18:10:24 -0800 | [diff] [blame] | 720 | } |
Brian Swetland | 02863b9 | 2010-09-19 03:36:39 -0700 | [diff] [blame] | 721 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 722 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 723 | if (booting) { |
| 724 | // If we're not fully booted, we may be missing |
| 725 | // filesystems needed for firmware, wait and retry. |
Elliott Hughes | 290a228 | 2016-11-14 17:08:47 -0800 | [diff] [blame] | 726 | std::this_thread::sleep_for(100ms); |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 727 | booting = is_booting(); |
| 728 | goto try_loading_again; |
| 729 | } |
| 730 | |
| 731 | LOG(ERROR) << "firmware: could not find firmware for " << uevent->firmware; |
| 732 | |
| 733 | // Write "-1" as our response to the kernel's firmware request, since we have nothing for it. |
| 734 | write(loading_fd, "-1", 2); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 735 | } |
| 736 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 737 | static void handle_firmware_event(uevent* uevent) { |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 738 | if (uevent->subsystem != "firmware" || uevent->action != "add") return; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 739 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 740 | // Loading the firmware in a child means we can do that in parallel... |
| 741 | // (We ignore SIGCHLD rather than wait for our children.) |
| 742 | pid_t pid = fork(); |
| 743 | if (pid == 0) { |
| 744 | Timer t; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 745 | process_firmware_event(uevent); |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 746 | LOG(INFO) << "loading " << uevent->path << " took " << t; |
Kenny Root | 17baff4 | 2014-08-20 16:16:44 -0700 | [diff] [blame] | 747 | _exit(EXIT_SUCCESS); |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 748 | } else if (pid == -1) { |
| 749 | PLOG(ERROR) << "could not fork to process firmware event for " << uevent->firmware; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 750 | } |
| 751 | } |
| 752 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 753 | static bool inline should_stop_coldboot(coldboot_action_t act) |
| 754 | { |
| 755 | return (act == COLDBOOT_STOP || act == COLDBOOT_FINISH); |
| 756 | } |
| 757 | |
Ruchi Kandoi | c603720 | 2014-06-23 11:22:09 -0700 | [diff] [blame] | 758 | #define UEVENT_MSG_LEN 2048 |
Hung-ying Tyan | 99c4a8a | 2016-02-01 15:07:40 +0800 | [diff] [blame] | 759 | |
Sandeep Patil | 44a3ee2 | 2017-02-08 15:49:47 -0800 | [diff] [blame] | 760 | static inline coldboot_action_t handle_device_fd_with( |
| 761 | std::function<coldboot_action_t(uevent* uevent)> handle_uevent) |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 762 | { |
Vernon Tang | 3f582e9 | 2011-04-25 13:08:17 +1000 | [diff] [blame] | 763 | char msg[UEVENT_MSG_LEN+2]; |
| 764 | int n; |
Nick Kralevich | 57de8b8 | 2011-05-11 14:58:24 -0700 | [diff] [blame] | 765 | while ((n = uevent_kernel_multicast_recv(device_fd, msg, UEVENT_MSG_LEN)) > 0) { |
Nick Kralevich | 5f5d5c8 | 2010-07-19 14:31:20 -0700 | [diff] [blame] | 766 | if(n >= UEVENT_MSG_LEN) /* overflow -- discard */ |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 767 | continue; |
| 768 | |
| 769 | msg[n] = '\0'; |
| 770 | msg[n+1] = '\0'; |
| 771 | |
Tom Cherry | e3e4821 | 2017-04-11 13:53:37 -0700 | [diff] [blame] | 772 | uevent uevent; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 773 | parse_event(msg, &uevent); |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 774 | coldboot_action_t act = handle_uevent(&uevent); |
| 775 | if (should_stop_coldboot(act)) |
| 776 | return act; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 777 | } |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 778 | |
| 779 | return COLDBOOT_CONTINUE; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 780 | } |
| 781 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 782 | coldboot_action_t handle_device_fd(coldboot_callback fn) |
Hung-ying Tyan | 99c4a8a | 2016-02-01 15:07:40 +0800 | [diff] [blame] | 783 | { |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 784 | coldboot_action_t ret = handle_device_fd_with( |
| 785 | [&](uevent* uevent) -> coldboot_action_t { |
Hung-ying Tyan | 99c4a8a | 2016-02-01 15:07:40 +0800 | [diff] [blame] | 786 | if (selinux_status_updated() > 0) { |
| 787 | struct selabel_handle *sehandle2; |
| 788 | sehandle2 = selinux_android_file_context_handle(); |
| 789 | if (sehandle2) { |
| 790 | selabel_close(sehandle); |
| 791 | sehandle = sehandle2; |
| 792 | } |
| 793 | } |
| 794 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 795 | // default is to always create the devices |
| 796 | coldboot_action_t act = COLDBOOT_CREATE; |
| 797 | if (fn) { |
| 798 | act = fn(uevent); |
| 799 | } |
| 800 | |
| 801 | if (act == COLDBOOT_CREATE || act == COLDBOOT_STOP) { |
| 802 | handle_device_event(uevent); |
| 803 | handle_firmware_event(uevent); |
| 804 | } |
| 805 | |
| 806 | return act; |
Hung-ying Tyan | 99c4a8a | 2016-02-01 15:07:40 +0800 | [diff] [blame] | 807 | }); |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 808 | |
| 809 | return ret; |
Hung-ying Tyan | 99c4a8a | 2016-02-01 15:07:40 +0800 | [diff] [blame] | 810 | } |
| 811 | |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 812 | /* Coldboot walks parts of the /sys tree and pokes the uevent files |
| 813 | ** to cause the kernel to regenerate device add events that happened |
| 814 | ** before init's device manager was started |
| 815 | ** |
| 816 | ** We drain any pending events from the netlink socket every time |
| 817 | ** we poke another uevent file to make sure we don't overrun the |
Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 818 | ** socket's buffer. |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 819 | */ |
| 820 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 821 | static coldboot_action_t do_coldboot(DIR *d, coldboot_callback fn) |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 822 | { |
| 823 | struct dirent *de; |
| 824 | int dfd, fd; |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 825 | coldboot_action_t act = COLDBOOT_CONTINUE; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 826 | |
| 827 | dfd = dirfd(d); |
| 828 | |
| 829 | fd = openat(dfd, "uevent", O_WRONLY); |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 830 | if (fd >= 0) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 831 | write(fd, "add\n", 4); |
| 832 | close(fd); |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 833 | act = handle_device_fd(fn); |
| 834 | if (should_stop_coldboot(act)) |
| 835 | return act; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 836 | } |
| 837 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 838 | while (!should_stop_coldboot(act) && (de = readdir(d))) { |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 839 | DIR *d2; |
| 840 | |
| 841 | if(de->d_type != DT_DIR || de->d_name[0] == '.') |
| 842 | continue; |
| 843 | |
| 844 | fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY); |
| 845 | if(fd < 0) |
| 846 | continue; |
| 847 | |
| 848 | d2 = fdopendir(fd); |
| 849 | if(d2 == 0) |
| 850 | close(fd); |
| 851 | else { |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 852 | act = do_coldboot(d2, fn); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 853 | closedir(d2); |
| 854 | } |
| 855 | } |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 856 | |
| 857 | // default is always to continue looking for uevents |
| 858 | return act; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 859 | } |
| 860 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 861 | static coldboot_action_t coldboot(const char *path, coldboot_callback fn) |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 862 | { |
James Hawkins | 588a2ca | 2016-02-18 14:52:46 -0800 | [diff] [blame] | 863 | std::unique_ptr<DIR, decltype(&closedir)> d(opendir(path), closedir); |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 864 | if (d) { |
| 865 | return do_coldboot(d.get(), fn); |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 866 | } |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 867 | |
| 868 | return COLDBOOT_CONTINUE; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 869 | } |
| 870 | |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 871 | void device_init(const char* path, coldboot_callback fn) { |
Sandeep Patil | 971a460 | 2017-02-15 13:37:52 -0800 | [diff] [blame] | 872 | if (!sehandle) { |
| 873 | sehandle = selinux_android_file_context_handle(); |
Elliott Hughes | 56a0656 | 2015-03-28 11:23:32 -0700 | [diff] [blame] | 874 | } |
Sandeep Patil | 971a460 | 2017-02-15 13:37:52 -0800 | [diff] [blame] | 875 | // open uevent socket and selinux status only if it hasn't been |
| 876 | // done before |
| 877 | if (device_fd == -1) { |
| 878 | /* is 256K enough? udev uses 16MB! */ |
| 879 | device_fd.reset(uevent_open_socket(256 * 1024, true)); |
| 880 | if (device_fd == -1) { |
| 881 | return; |
| 882 | } |
| 883 | fcntl(device_fd, F_SETFL, O_NONBLOCK); |
| 884 | selinux_status_open(true); |
| 885 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 886 | |
Elliott Hughes | 56a0656 | 2015-03-28 11:23:32 -0700 | [diff] [blame] | 887 | if (access(COLDBOOT_DONE, F_OK) == 0) { |
Elliott Hughes | f86b5a6 | 2016-06-24 15:12:21 -0700 | [diff] [blame] | 888 | LOG(VERBOSE) << "Skipping coldboot, already done!"; |
Elliott Hughes | 56a0656 | 2015-03-28 11:23:32 -0700 | [diff] [blame] | 889 | return; |
Colin Cross | f83d0b9 | 2010-04-21 12:04:20 -0700 | [diff] [blame] | 890 | } |
Elliott Hughes | 56a0656 | 2015-03-28 11:23:32 -0700 | [diff] [blame] | 891 | |
| 892 | Timer t; |
Sandeep Patil | 957e4ab | 2017-02-07 18:11:37 -0800 | [diff] [blame] | 893 | coldboot_action_t act; |
| 894 | if (!path) { |
| 895 | act = coldboot("/sys/class", fn); |
| 896 | if (!should_stop_coldboot(act)) { |
| 897 | act = coldboot("/sys/block", fn); |
| 898 | if (!should_stop_coldboot(act)) { |
| 899 | act = coldboot("/sys/devices", fn); |
| 900 | } |
| 901 | } |
| 902 | } else { |
| 903 | act = coldboot(path, fn); |
| 904 | } |
| 905 | |
| 906 | // If we have a callback, then do as it says. If no, then the default is |
| 907 | // to always create COLDBOOT_DONE file. |
| 908 | if (!fn || (act == COLDBOOT_FINISH)) { |
| 909 | close(open(COLDBOOT_DONE, O_WRONLY|O_CREAT|O_CLOEXEC, 0000)); |
| 910 | } |
| 911 | |
Elliott Hughes | 331cf2f | 2016-11-29 19:20:58 +0000 | [diff] [blame] | 912 | LOG(INFO) << "Coldboot took " << t; |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 913 | } |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 914 | |
Sandeep Patil | 35403eb | 2017-02-08 20:27:12 -0800 | [diff] [blame] | 915 | void device_close() { |
Tom Cherry | 1ab8f55 | 2017-04-06 14:41:30 -0700 | [diff] [blame] | 916 | platform_devices.clear(); |
Sandeep Patil | 35403eb | 2017-02-08 20:27:12 -0800 | [diff] [blame] | 917 | device_fd.reset(); |
Sandeep Patil | 971a460 | 2017-02-15 13:37:52 -0800 | [diff] [blame] | 918 | selinux_status_close(); |
Sandeep Patil | 35403eb | 2017-02-08 20:27:12 -0800 | [diff] [blame] | 919 | } |
| 920 | |
Elliott Hughes | 632e99a | 2016-11-12 11:44:16 -0800 | [diff] [blame] | 921 | int get_device_fd() { |
Colin Cross | 0dd7ca6 | 2010-04-13 19:25:51 -0700 | [diff] [blame] | 922 | return device_fd; |
The Android Open Source Project | 4f6e8d7 | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 923 | } |