30a36273ab
Somewhat unsurprisingly, very few commands are happy to be run like this, in particular multiplexed commands like toybox. But that's no reason for the linker to get in the way too. Bug: http://b/33276926 Test: new test Change-Id: I6dd71ea0183f4da83571039c2198ebb6ed38520e
125 lines
3.9 KiB
C++
125 lines
3.9 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 <string.h>
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#include <sys/prctl.h>
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#include <sys/system_properties.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 "android-base/strings.h"
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#include "linker_logger.h"
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#include "private/libc_logging.h"
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LinkerLogger g_linker_logger;
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static const char* kSystemLdDebugProperty = "debug.ld.all";
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static const char* kLdDebugPropertyPrefix = "debug.ld.app.";
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static const char* kOptionErrors = "dlerror";
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static const char* kOptionDlopen = "dlopen";
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static const char* kOptionDlsym = "dlsym";
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static std::string property_get(const char* name) {
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char value[PROP_VALUE_MAX] = {};
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__system_property_get(name, value);
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return value;
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}
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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 == kOptionErrors) {
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flags |= kLogErrors;
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} else if (o == kOptionDlopen){
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flags |= kLogDlopen;
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} else if (o == kOptionDlsym){
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flags |= kLogDlsym;
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} else {
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__libc_format_log(ANDROID_LOG_WARN, "linker", "Unknown debug.ld option \"%s\", will ignore.", 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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void LinkerLogger::ResetState() {
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// the most likely scenario app is not debuggable and
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// is running on user build - the 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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flags_ = 0;
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// Check flag applied to all processes first.
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std::string value = property_get(kSystemLdDebugProperty);
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flags_ |= ParseProperty(value);
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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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// 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(kLdDebugPropertyPrefix) + process_name;
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value = property_get(property_name.c_str());
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flags_ |= ParseProperty(value);
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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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__libc_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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