8fe5127027
Currently, debuggerd tells the teacher that an app that received a fatal signal. On the playground, dobbing on a process that doesn't actually need to be killed is considered a friendship-ending move. Because recoverable GWP-ASan is *supposed* to not crash your app, suppress this behaviour and don't let ActivityManager know about the crash. Bug: N/A Test: Run a use-after-free in an app that's using recoverable GWP-ASan, through the 'libc.debug.gwp_asan.recoverable.<app_name>=1' and 'libc.debug.gwp_asan.process_sampling.<app_name>=1' sysprops. Change-Id: I033ea67d577573df10936e37db7302d4f4bc0069
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/*
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* Copyright 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <bionic/reserved_signals.h>
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#include <signal.h>
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#include <stdint.h>
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#include <string.h>
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#include <sys/cdefs.h>
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#include <sys/system_properties.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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// Forward declare these classes so not everyone has to include GWP-ASan
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// headers.
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namespace gwp_asan {
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struct AllocatorState;
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struct AllocationMetadata;
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}; // namespace gwp_asan
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// When updating this data structure, CrashInfoDataDynamic and the code in
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// ReadCrashInfo() must also be updated.
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struct __attribute__((packed)) debugger_process_info {
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void* abort_msg;
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void* fdsan_table;
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const gwp_asan::AllocatorState* gwp_asan_state;
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const gwp_asan::AllocationMetadata* gwp_asan_metadata;
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const char* scudo_stack_depot;
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const char* scudo_region_info;
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const char* scudo_ring_buffer;
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size_t scudo_ring_buffer_size;
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bool recoverable_gwp_asan_crash;
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};
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// GWP-ASan calbacks to support the recoverable mode. Separate from the
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// debuggerd_callbacks_t because these values aren't available at debuggerd_init
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// time, and have to be synthesized on request.
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typedef struct {
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bool (*debuggerd_needs_gwp_asan_recovery)(void* fault_addr);
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void (*debuggerd_gwp_asan_pre_crash_report)(void* fault_addr);
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void (*debuggerd_gwp_asan_post_crash_report)(void* fault_addr);
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} gwp_asan_callbacks_t;
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// These callbacks are called in a signal handler, and thus must be async signal safe.
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// If null, the callbacks will not be called.
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typedef struct {
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debugger_process_info (*get_process_info)();
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gwp_asan_callbacks_t (*get_gwp_asan_callbacks)();
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void (*post_dump)();
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} debuggerd_callbacks_t;
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void debuggerd_init(debuggerd_callbacks_t* callbacks);
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bool debuggerd_handle_signal(int signal_number, siginfo_t* info, void* context);
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// DEBUGGER_ACTION_DUMP_TOMBSTONE and DEBUGGER_ACTION_DUMP_BACKTRACE are both
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// triggered via BIONIC_SIGNAL_DEBUGGER. The debugger_action_t is sent via si_value
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// using sigqueue(2) or equivalent. If no si_value is specified (e.g. if the
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// signal is sent by kill(2)), the default behavior is to print the backtrace
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// to the log.
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#define DEBUGGER_SIGNAL BIONIC_SIGNAL_DEBUGGER
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static void __attribute__((__unused__)) debuggerd_register_handlers(struct sigaction* action) {
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bool enabled = true;
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#if ANDROID_DEBUGGABLE
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char value[PROP_VALUE_MAX] = "";
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enabled = !(__system_property_get("debug.debuggerd.disable", value) > 0 && !strcmp(value, "1"));
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#endif
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if (enabled) {
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sigaction(SIGABRT, action, nullptr);
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sigaction(SIGBUS, action, nullptr);
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sigaction(SIGFPE, action, nullptr);
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sigaction(SIGILL, action, nullptr);
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sigaction(SIGSEGV, action, nullptr);
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sigaction(SIGSTKFLT, action, nullptr);
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sigaction(SIGSYS, action, nullptr);
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sigaction(SIGTRAP, action, nullptr);
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}
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sigaction(BIONIC_SIGNAL_DEBUGGER, action, nullptr);
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}
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__END_DECLS
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