5543746934
The glibc implementation of the loader passes argc/argv/envp to all elf constructors. This change makes bionic linker behave in the same way. Bug: http://b/30145768 Change-Id: I1c65c42aa5305a5b133c64b5748205bbde869e0e Test: run bionic-unit-tests --gtest_filter=dl*:Dl*
119 lines
3.6 KiB
C++
119 lines
3.6 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 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 {
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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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// get process basename
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std::string process_name = basename(g_argv[0]);
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std::string property_name = std::string(kLdDebugPropertyPrefix) + process_name;
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// Property names are limited to PROP_NAME_MAX.
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if (property_name.size() >= PROP_NAME_MAX) {
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size_t count = PROP_NAME_MAX - 1;
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// remove trailing dots...
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while (property_name[count-1] == '.') {
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--count;
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}
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property_name = property_name.substr(0, count);
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}
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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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