7a3681e5b6
This library is used by a number of different libraries in the system. Make it easy for platform libraries to use this library and create an actual exported include file. Change the names of the functions to reflect the new name of the library. Run clang_format on the async_safe_log.cpp file since the formatting is all over the place. Bug: 31919199 Test: Compiled for angler/bullhead, and booted. Test: Ran bionic unit tests. Test: Ran the malloc debug tests. Change-Id: I8071bf690c17b0ea3bc8dc5749cdd5b6ad58478a
130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "linker_logger.h"
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#include <string.h>
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#include <sys/prctl.h>
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#include <unistd.h>
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#include <string>
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#include <vector>
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#include <async_safe/log.h>
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#include "android-base/strings.h"
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#include "private/CachedProperty.h"
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LinkerLogger g_linker_logger;
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bool g_greylist_disabled = false;
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static uint32_t ParseProperty(const std::string& value) {
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if (value.empty()) {
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return 0;
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}
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std::vector<std::string> options = android::base::Split(value, ",");
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uint32_t flags = 0;
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for (const auto& o : options) {
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if (o == "dlerror") {
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flags |= kLogErrors;
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} else if (o == "dlopen") {
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flags |= kLogDlopen;
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} else if (o == "dlsym") {
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flags |= kLogDlsym;
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} else {
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async_safe_format_log(ANDROID_LOG_WARN, "linker", "Ignoring unknown debug.ld option \"%s\"",
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o.c_str());
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}
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}
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return flags;
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}
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static void GetAppSpecificProperty(char* buffer) {
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// Get process basename.
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const char* process_name_start = basename(g_argv[0]);
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// Remove ':' and everything after it. This is the naming convention for
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// services: https://developer.android.com/guide/components/services.html
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const char* process_name_end = strchr(process_name_start, ':');
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std::string process_name = (process_name_end != nullptr) ?
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std::string(process_name_start, (process_name_end - process_name_start)) :
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std::string(process_name_start);
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std::string property_name = std::string("debug.ld.app.") + process_name;
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__system_property_get(property_name.c_str(), buffer);
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}
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void LinkerLogger::ResetState() {
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// The most likely scenario app is not debuggable and
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// is running on a user build, in which case logging is disabled.
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if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0) {
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return;
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}
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// This is a convenient place to check whether the greylist should be disabled for testing.
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static CachedProperty greylist_disabled("debug.ld.greylist_disabled");
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bool old_value = g_greylist_disabled;
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g_greylist_disabled = (strcmp(greylist_disabled.Get(), "true") == 0);
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if (g_greylist_disabled != old_value) {
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async_safe_format_log(ANDROID_LOG_INFO, "linker", "%s greylist",
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g_greylist_disabled ? "Disabling" : "Enabling");
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}
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flags_ = 0;
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// For logging, check the flag applied to all processes first.
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static CachedProperty debug_ld_all("debug.ld.all");
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flags_ |= ParseProperty(debug_ld_all.Get());
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// Ignore processes started without argv (http://b/33276926).
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if (g_argv[0] == nullptr) {
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return;
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}
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// Otherwise check the app-specific property too.
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// We can't easily cache the property here because argv[0] changes.
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char debug_ld_app[PROP_VALUE_MAX] = {};
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GetAppSpecificProperty(debug_ld_app);
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flags_ |= ParseProperty(debug_ld_app);
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}
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void LinkerLogger::Log(uint32_t type, const char* format, ...) {
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if ((flags_ & type) == 0) {
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return;
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}
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va_list ap;
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va_start(ap, format);
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async_safe_format_log_va_list(ANDROID_LOG_DEBUG, "linker", format, ap);
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va_end(ap);
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}
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