You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
623 lines
20 KiB
623 lines
20 KiB
/*
|
|
* Copyright (C) 2017 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "linker_config.h"
|
|
|
|
#include "linker_globals.h"
|
|
#include "linker_debug.h"
|
|
#include "linker_utils.h"
|
|
|
|
#include <android-base/file.h>
|
|
#include <android-base/properties.h>
|
|
#include <android-base/scopeguard.h>
|
|
#include <android-base/strings.h>
|
|
|
|
#include <async_safe/log.h>
|
|
|
|
#include <limits.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include <string>
|
|
#include <unordered_map>
|
|
|
|
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
|
|
#include <sys/_system_properties.h>
|
|
|
|
class ConfigParser {
|
|
public:
|
|
enum {
|
|
kPropertyAssign,
|
|
kPropertyAppend,
|
|
kSection,
|
|
kEndOfFile,
|
|
kError,
|
|
};
|
|
|
|
explicit ConfigParser(std::string&& content)
|
|
: content_(std::move(content)), p_(0), lineno_(0), was_end_of_file_(false) {}
|
|
|
|
/*
|
|
* Possible return values
|
|
* kPropertyAssign: name is set to property name and value is set to property value
|
|
* kPropertyAppend: same as kPropertyAssign, but the value should be appended
|
|
* kSection: name is set to section name.
|
|
* kEndOfFile: reached end of file.
|
|
* kError: error_msg is set.
|
|
*/
|
|
int next_token(std::string* name, std::string* value, std::string* error_msg) {
|
|
std::string line;
|
|
while(NextLine(&line)) {
|
|
size_t found = line.find('#');
|
|
line = android::base::Trim(line.substr(0, found));
|
|
|
|
if (line.empty()) {
|
|
continue;
|
|
}
|
|
|
|
if (line[0] == '[' && line.back() == ']') {
|
|
*name = line.substr(1, line.size() - 2);
|
|
return kSection;
|
|
}
|
|
|
|
size_t found_assign = line.find('=');
|
|
size_t found_append = line.find("+=");
|
|
if (found_assign != std::string::npos && found_append == std::string::npos) {
|
|
*name = android::base::Trim(line.substr(0, found_assign));
|
|
*value = android::base::Trim(line.substr(found_assign + 1));
|
|
return kPropertyAssign;
|
|
}
|
|
|
|
if (found_append != std::string::npos) {
|
|
*name = android::base::Trim(line.substr(0, found_append));
|
|
*value = android::base::Trim(line.substr(found_append + 2));
|
|
return kPropertyAppend;
|
|
}
|
|
|
|
*error_msg = std::string("invalid format: ") +
|
|
line +
|
|
", expected \"name = property\", \"name += property\", or \"[section]\"";
|
|
return kError;
|
|
}
|
|
|
|
// to avoid infinite cycles when programmer makes a mistake
|
|
CHECK(!was_end_of_file_);
|
|
was_end_of_file_ = true;
|
|
return kEndOfFile;
|
|
}
|
|
|
|
size_t lineno() const {
|
|
return lineno_;
|
|
}
|
|
|
|
private:
|
|
bool NextLine(std::string* line) {
|
|
if (p_ == std::string::npos) {
|
|
return false;
|
|
}
|
|
|
|
size_t found = content_.find('\n', p_);
|
|
if (found != std::string::npos) {
|
|
*line = content_.substr(p_, found - p_);
|
|
p_ = found + 1;
|
|
} else {
|
|
*line = content_.substr(p_);
|
|
p_ = std::string::npos;
|
|
}
|
|
|
|
lineno_++;
|
|
return true;
|
|
}
|
|
|
|
std::string content_;
|
|
size_t p_;
|
|
size_t lineno_;
|
|
bool was_end_of_file_;
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(ConfigParser);
|
|
};
|
|
|
|
class PropertyValue {
|
|
public:
|
|
PropertyValue() = default;
|
|
|
|
PropertyValue(std::string&& value, size_t lineno)
|
|
: value_(std::move(value)), lineno_(lineno) {}
|
|
|
|
const std::string& value() const {
|
|
return value_;
|
|
}
|
|
|
|
void append_value(std::string&& value) {
|
|
value_ = value_ + value;
|
|
// lineno isn't updated as we might have cases like this:
|
|
// property.x = blah
|
|
// property.y = blah
|
|
// property.x += blah
|
|
}
|
|
|
|
size_t lineno() const {
|
|
return lineno_;
|
|
}
|
|
|
|
private:
|
|
std::string value_;
|
|
size_t lineno_;
|
|
};
|
|
|
|
static std::string create_error_msg(const char* file,
|
|
size_t lineno,
|
|
const std::string& msg) {
|
|
char buf[1024];
|
|
async_safe_format_buffer(buf, sizeof(buf), "%s:%zu: error: %s", file, lineno, msg.c_str());
|
|
|
|
return std::string(buf);
|
|
}
|
|
|
|
static bool parse_config_file(const char* ld_config_file_path,
|
|
const char* binary_realpath,
|
|
std::unordered_map<std::string, PropertyValue>* properties,
|
|
std::string* error_msg) {
|
|
std::string content;
|
|
if (!android::base::ReadFileToString(ld_config_file_path, &content)) {
|
|
if (errno != ENOENT) {
|
|
*error_msg = std::string("error reading file \"") +
|
|
ld_config_file_path + "\": " + strerror(errno);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
ConfigParser cp(std::move(content));
|
|
|
|
std::string section_name;
|
|
|
|
while (true) {
|
|
std::string name;
|
|
std::string value;
|
|
std::string error;
|
|
|
|
int result = cp.next_token(&name, &value, &error);
|
|
if (result == ConfigParser::kError) {
|
|
DL_WARN("%s:%zd: warning: couldn't parse %s (ignoring this line)",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
error.c_str());
|
|
continue;
|
|
}
|
|
|
|
if (result == ConfigParser::kSection || result == ConfigParser::kEndOfFile) {
|
|
return false;
|
|
}
|
|
|
|
if (result == ConfigParser::kPropertyAssign) {
|
|
if (!android::base::StartsWith(name, "dir.")) {
|
|
DL_WARN("%s:%zd: warning: unexpected property name \"%s\", "
|
|
"expected format dir.<section_name> (ignoring this line)",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
name.c_str());
|
|
continue;
|
|
}
|
|
|
|
// remove trailing '/'
|
|
while (!value.empty() && value.back() == '/') {
|
|
value.pop_back();
|
|
}
|
|
|
|
if (value.empty()) {
|
|
DL_WARN("%s:%zd: warning: property value is empty (ignoring this line)",
|
|
ld_config_file_path,
|
|
cp.lineno());
|
|
continue;
|
|
}
|
|
|
|
// If the path can be resolved, resolve it
|
|
char buf[PATH_MAX];
|
|
std::string resolved_path;
|
|
if (access(value.c_str(), R_OK) != 0) {
|
|
if (errno == ENOENT) {
|
|
// no need to test for non-existing path. skip.
|
|
continue;
|
|
}
|
|
// If not accessible, don't call realpath as it will just cause
|
|
// SELinux denial spam. Use the path unresolved.
|
|
resolved_path = value;
|
|
} else if (realpath(value.c_str(), buf)) {
|
|
resolved_path = buf;
|
|
} else {
|
|
// realpath is expected to fail with EPERM in some situations, so log
|
|
// the failure with INFO rather than DL_WARN. e.g. A binary in
|
|
// /data/local/tmp may attempt to stat /postinstall. See
|
|
// http://b/120996057.
|
|
INFO("%s:%zd: warning: path \"%s\" couldn't be resolved: %s",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
value.c_str(),
|
|
strerror(errno));
|
|
resolved_path = value;
|
|
}
|
|
|
|
if (file_is_under_dir(binary_realpath, resolved_path)) {
|
|
section_name = name.substr(4);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
INFO("[ Using config section \"%s\" ]", section_name.c_str());
|
|
|
|
// skip everything until we meet a correct section
|
|
while (true) {
|
|
std::string name;
|
|
std::string value;
|
|
std::string error;
|
|
|
|
int result = cp.next_token(&name, &value, &error);
|
|
|
|
if (result == ConfigParser::kSection && name == section_name) {
|
|
break;
|
|
}
|
|
|
|
if (result == ConfigParser::kEndOfFile) {
|
|
*error_msg = create_error_msg(ld_config_file_path,
|
|
cp.lineno(),
|
|
std::string("section \"") + section_name + "\" not found");
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// found the section - parse it
|
|
while (true) {
|
|
std::string name;
|
|
std::string value;
|
|
std::string error;
|
|
|
|
int result = cp.next_token(&name, &value, &error);
|
|
|
|
if (result == ConfigParser::kEndOfFile || result == ConfigParser::kSection) {
|
|
break;
|
|
}
|
|
|
|
if (result == ConfigParser::kPropertyAssign) {
|
|
if (properties->find(name) != properties->end()) {
|
|
DL_WARN("%s:%zd: warning: redefining property \"%s\" (overriding previous value)",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
name.c_str());
|
|
}
|
|
|
|
(*properties)[name] = PropertyValue(std::move(value), cp.lineno());
|
|
} else if (result == ConfigParser::kPropertyAppend) {
|
|
if (properties->find(name) == properties->end()) {
|
|
DL_WARN("%s:%zd: warning: appending to undefined property \"%s\" (treating as assignment)",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
name.c_str());
|
|
(*properties)[name] = PropertyValue(std::move(value), cp.lineno());
|
|
} else {
|
|
if (android::base::EndsWith(name, ".links") ||
|
|
android::base::EndsWith(name, ".namespaces")) {
|
|
value = "," + value;
|
|
(*properties)[name].append_value(std::move(value));
|
|
} else if (android::base::EndsWith(name, ".paths") ||
|
|
android::base::EndsWith(name, ".shared_libs") ||
|
|
android::base::EndsWith(name, ".whitelisted") ||
|
|
android::base::EndsWith(name, ".allowed_libs")) {
|
|
value = ":" + value;
|
|
(*properties)[name].append_value(std::move(value));
|
|
} else {
|
|
DL_WARN("%s:%zd: warning: += isn't allowed for property \"%s\" (ignoring)",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
name.c_str());
|
|
}
|
|
}
|
|
}
|
|
|
|
if (result == ConfigParser::kError) {
|
|
DL_WARN("%s:%zd: warning: couldn't parse %s (ignoring this line)",
|
|
ld_config_file_path,
|
|
cp.lineno(),
|
|
error.c_str());
|
|
continue;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static Config g_config;
|
|
|
|
static constexpr const char* kDefaultConfigName = "default";
|
|
static constexpr const char* kPropertyAdditionalNamespaces = "additional.namespaces";
|
|
|
|
class Properties {
|
|
public:
|
|
explicit Properties(std::unordered_map<std::string, PropertyValue>&& properties)
|
|
: properties_(std::move(properties)), target_sdk_version_(__ANDROID_API__) {}
|
|
|
|
std::vector<std::string> get_strings(const std::string& name, size_t* lineno = nullptr) const {
|
|
auto it = find_property(name, lineno);
|
|
if (it == properties_.end()) {
|
|
// return empty vector
|
|
return std::vector<std::string>();
|
|
}
|
|
|
|
std::vector<std::string> strings = android::base::Split(it->second.value(), ",");
|
|
|
|
for (size_t i = 0; i < strings.size(); ++i) {
|
|
strings[i] = android::base::Trim(strings[i]);
|
|
}
|
|
|
|
return strings;
|
|
}
|
|
|
|
bool get_bool(const std::string& name, size_t* lineno = nullptr) const {
|
|
auto it = find_property(name, lineno);
|
|
if (it == properties_.end()) {
|
|
return false;
|
|
}
|
|
|
|
return it->second.value() == "true";
|
|
}
|
|
|
|
std::string get_string(const std::string& name, size_t* lineno = nullptr) const {
|
|
auto it = find_property(name, lineno);
|
|
return (it == properties_.end()) ? "" : it->second.value();
|
|
}
|
|
|
|
std::vector<std::string> get_paths(const std::string& name, bool resolve, size_t* lineno = nullptr) {
|
|
std::string paths_str = get_string(name, lineno);
|
|
|
|
std::vector<std::string> paths;
|
|
split_path(paths_str.c_str(), ":", &paths);
|
|
|
|
std::vector<std::pair<std::string, std::string>> params;
|
|
params.push_back({ "LIB", kLibPath });
|
|
if (target_sdk_version_ != 0) {
|
|
char buf[16];
|
|
async_safe_format_buffer(buf, sizeof(buf), "%d", target_sdk_version_);
|
|
params.push_back({ "SDK_VER", buf });
|
|
}
|
|
|
|
static std::string vndk_ver = Config::get_vndk_version_string('-');
|
|
params.push_back({ "VNDK_VER", vndk_ver });
|
|
static std::string vndk_apex_ver = Config::get_vndk_version_string('v');
|
|
params.push_back({ "VNDK_APEX_VER", vndk_apex_ver });
|
|
|
|
for (auto& path : paths) {
|
|
format_string(&path, params);
|
|
}
|
|
|
|
if (resolve) {
|
|
std::vector<std::string> resolved_paths;
|
|
for (const auto& path : paths) {
|
|
if (path.empty()) {
|
|
continue;
|
|
}
|
|
// this is single threaded. no need to lock
|
|
auto cached = resolved_paths_.find(path);
|
|
if (cached == resolved_paths_.end()) {
|
|
resolved_paths_[path] = resolve_path(path);
|
|
cached = resolved_paths_.find(path);
|
|
}
|
|
CHECK(cached != resolved_paths_.end());
|
|
if (cached->second.empty()) {
|
|
continue;
|
|
}
|
|
resolved_paths.push_back(cached->second);
|
|
}
|
|
|
|
return resolved_paths;
|
|
} else {
|
|
return paths;
|
|
}
|
|
}
|
|
|
|
void set_target_sdk_version(int target_sdk_version) {
|
|
target_sdk_version_ = target_sdk_version;
|
|
}
|
|
|
|
private:
|
|
std::unordered_map<std::string, PropertyValue>::const_iterator
|
|
find_property(const std::string& name, size_t* lineno) const {
|
|
auto it = properties_.find(name);
|
|
if (it != properties_.end() && lineno != nullptr) {
|
|
*lineno = it->second.lineno();
|
|
}
|
|
|
|
return it;
|
|
}
|
|
std::unordered_map<std::string, PropertyValue> properties_;
|
|
std::unordered_map<std::string, std::string> resolved_paths_;
|
|
int target_sdk_version_;
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(Properties);
|
|
};
|
|
|
|
bool Config::read_binary_config(const char* ld_config_file_path,
|
|
const char* binary_realpath,
|
|
bool is_asan,
|
|
const Config** config,
|
|
std::string* error_msg) {
|
|
g_config.clear();
|
|
|
|
std::unordered_map<std::string, PropertyValue> property_map;
|
|
if (!parse_config_file(ld_config_file_path, binary_realpath, &property_map, error_msg)) {
|
|
return false;
|
|
}
|
|
|
|
Properties properties(std::move(property_map));
|
|
|
|
auto failure_guard = android::base::make_scope_guard([] { g_config.clear(); });
|
|
|
|
std::unordered_map<std::string, NamespaceConfig*> namespace_configs;
|
|
|
|
namespace_configs[kDefaultConfigName] = g_config.create_namespace_config(kDefaultConfigName);
|
|
|
|
std::vector<std::string> additional_namespaces = properties.get_strings(kPropertyAdditionalNamespaces);
|
|
for (const auto& name : additional_namespaces) {
|
|
namespace_configs[name] = g_config.create_namespace_config(name);
|
|
}
|
|
|
|
bool versioning_enabled = properties.get_bool("enable.target.sdk.version");
|
|
int target_sdk_version = __ANDROID_API__;
|
|
if (versioning_enabled) {
|
|
std::string version_file = dirname(binary_realpath) + "/.version";
|
|
std::string content;
|
|
if (!android::base::ReadFileToString(version_file, &content)) {
|
|
if (errno != ENOENT) {
|
|
*error_msg = std::string("error reading version file \"") +
|
|
version_file + "\": " + strerror(errno);
|
|
return false;
|
|
}
|
|
} else {
|
|
content = android::base::Trim(content);
|
|
errno = 0;
|
|
char* end = nullptr;
|
|
const char* content_str = content.c_str();
|
|
int result = strtol(content_str, &end, 10);
|
|
if (errno == 0 && *end == '\0' && result > 0) {
|
|
target_sdk_version = result;
|
|
properties.set_target_sdk_version(target_sdk_version);
|
|
} else {
|
|
*error_msg = std::string("invalid version \"") + version_file + "\": \"" + content +"\"";
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
g_config.set_target_sdk_version(target_sdk_version);
|
|
|
|
for (const auto& ns_config_it : namespace_configs) {
|
|
auto& name = ns_config_it.first;
|
|
NamespaceConfig* ns_config = ns_config_it.second;
|
|
|
|
std::string property_name_prefix = std::string("namespace.") + name;
|
|
|
|
size_t lineno = 0;
|
|
std::vector<std::string> linked_namespaces =
|
|
properties.get_strings(property_name_prefix + ".links", &lineno);
|
|
|
|
for (const auto& linked_ns_name : linked_namespaces) {
|
|
if (namespace_configs.find(linked_ns_name) == namespace_configs.end()) {
|
|
*error_msg = create_error_msg(ld_config_file_path,
|
|
lineno,
|
|
std::string("undefined namespace: ") + linked_ns_name);
|
|
return false;
|
|
}
|
|
|
|
bool allow_all_shared_libs = properties.get_bool(property_name_prefix + ".link." +
|
|
linked_ns_name + ".allow_all_shared_libs");
|
|
|
|
std::string shared_libs = properties.get_string(property_name_prefix +
|
|
".link." +
|
|
linked_ns_name +
|
|
".shared_libs", &lineno);
|
|
|
|
if (!allow_all_shared_libs && shared_libs.empty()) {
|
|
*error_msg = create_error_msg(ld_config_file_path,
|
|
lineno,
|
|
std::string("list of shared_libs for ") +
|
|
name +
|
|
"->" +
|
|
linked_ns_name +
|
|
" link is not specified or is empty.");
|
|
return false;
|
|
}
|
|
|
|
if (allow_all_shared_libs && !shared_libs.empty()) {
|
|
*error_msg = create_error_msg(ld_config_file_path, lineno,
|
|
std::string("both shared_libs and allow_all_shared_libs "
|
|
"are set for ") +
|
|
name + "->" + linked_ns_name + " link.");
|
|
return false;
|
|
}
|
|
|
|
ns_config->add_namespace_link(linked_ns_name, shared_libs, allow_all_shared_libs);
|
|
}
|
|
|
|
ns_config->set_isolated(properties.get_bool(property_name_prefix + ".isolated"));
|
|
ns_config->set_visible(properties.get_bool(property_name_prefix + ".visible"));
|
|
|
|
std::string allowed_libs =
|
|
properties.get_string(property_name_prefix + ".whitelisted", &lineno);
|
|
const std::string libs = properties.get_string(property_name_prefix + ".allowed_libs", &lineno);
|
|
if (!allowed_libs.empty() && !libs.empty()) {
|
|
allowed_libs += ":";
|
|
}
|
|
allowed_libs += libs;
|
|
if (!allowed_libs.empty()) {
|
|
ns_config->set_allowed_libs(android::base::Split(allowed_libs, ":"));
|
|
}
|
|
|
|
// these are affected by is_asan flag
|
|
if (is_asan) {
|
|
property_name_prefix += ".asan";
|
|
}
|
|
|
|
// search paths are resolved (canonicalized). This is required mainly for
|
|
// the case when /vendor is a symlink to /system/vendor, which is true for
|
|
// non Treble-ized legacy devices.
|
|
ns_config->set_search_paths(properties.get_paths(property_name_prefix + ".search.paths", true));
|
|
|
|
// However, for permitted paths, we are not required to resolve the paths
|
|
// since they are only set for isolated namespaces, which implies the device
|
|
// is Treble-ized (= /vendor is not a symlink to /system/vendor).
|
|
// In fact, the resolving is causing an unexpected side effect of selinux
|
|
// denials on some executables which are not allowed to access some of the
|
|
// permitted paths.
|
|
ns_config->set_permitted_paths(properties.get_paths(property_name_prefix + ".permitted.paths", false));
|
|
}
|
|
|
|
failure_guard.Disable();
|
|
*config = &g_config;
|
|
return true;
|
|
}
|
|
|
|
std::string Config::get_vndk_version_string(const char delimiter) {
|
|
std::string version = android::base::GetProperty("ro.vndk.version", "");
|
|
if (version != "" && version != "current") {
|
|
//add the delimiter char in front of the string and return it.
|
|
return version.insert(0, 1, delimiter);
|
|
}
|
|
return "";
|
|
}
|
|
|
|
NamespaceConfig* Config::create_namespace_config(const std::string& name) {
|
|
namespace_configs_.push_back(std::unique_ptr<NamespaceConfig>(new NamespaceConfig(name)));
|
|
NamespaceConfig* ns_config_ptr = namespace_configs_.back().get();
|
|
namespace_configs_map_[name] = ns_config_ptr;
|
|
return ns_config_ptr;
|
|
}
|
|
|
|
void Config::clear() {
|
|
namespace_configs_.clear();
|
|
namespace_configs_map_.clear();
|
|
}
|