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platform_system_core
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Merge "libdebuggerd_handler: in-process crash dumping for seccomped processes."

This commit is contained in:
Josh Gao 2017-02-16 23:11:51 +00:00 committed by Gerrit Code Review
parent a70f11331f e73c932373
commit c7cd48af58
7 changed files with 194 additions and 40 deletions
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50
debuggerd/Android.bp
View File

@ -12,14 +12,48 @@ cc_defaults {
}
cc_library_static {
name: "libdebuggerd_handler",
name: "libdebuggerd_handler_core",
defaults: ["debuggerd_defaults"],
srcs: ["handler/debuggerd_handler.cpp"],
// libdebuggerd_handler gets async signal safe logging via libc_logging,
// which defines its interface in bionic private headers.
include_dirs: ["bionic/libc"],
static_libs: ["libc_logging"],
whole_static_libs: [
"libc_logging",
"libdebuggerd",
],
export_include_dirs: ["include"],
}
cc_library_static {
name: "libdebuggerd_handler",
defaults: ["debuggerd_defaults"],
srcs: ["handler/debuggerd_fallback_nop.cpp"],
whole_static_libs: [
"libdebuggerd_handler_core",
],
export_include_dirs: ["include"],
}
cc_library_static {
name: "libdebuggerd_handler_fallback",
defaults: ["debuggerd_defaults"],
srcs: ["handler/debuggerd_fallback.cpp"],
// libdebuggerd_handler gets async signal safe logging via libc_logging,
// which defines its interface in bionic private headers.
include_dirs: ["bionic/libc"],
static_libs: [
"libdebuggerd",
"libbacktrace",
"libunwind",
"liblzma",
"libcutils",
],
export_include_dirs: ["include"],
}
@ -39,7 +73,7 @@ cc_library {
export_include_dirs: ["include"],
}
cc_library {
cc_library_static {
name: "libdebuggerd",
defaults: ["debuggerd_defaults"],
@ -75,8 +109,10 @@ cc_library {
local_include_dirs: ["libdebuggerd/include"],
export_include_dirs: ["libdebuggerd/include"],
shared_libs: [
static_libs: [
"libbacktrace",
"libunwind",
"liblzma",
"libbase",
"libcutils",
"liblog",
@ -150,10 +186,14 @@ cc_binary {
},
},
static_libs: [
"libdebuggerd",
"libcutils",
],
shared_libs: [
"libbacktrace",
"libbase",
"libdebuggerd",
"liblog",
"libprocinfo",
"libselinux",

4
debuggerd/crash_dump.cpp
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@ -395,8 +395,8 @@ int main(int argc, char** argv) {
if (backtrace) {
dump_backtrace(output_fd.get(), backtrace_map.get(), target, main_tid, attached_siblings, 0);
} else {
engrave_tombstone(output_fd.get(), backtrace_map.get(), open_files, target, main_tid,
attached_siblings, abort_address, fatal_signal ? &amfd_data : nullptr);
engrave_tombstone(output_fd.get(), backtrace_map.get(), &open_files, target, main_tid,
&attached_siblings, abort_address, fatal_signal ? &amfd_data : nullptr);
}
// We don't actually need to PTRACE_DETACH, as long as our tracees aren't in

48
debuggerd/handler/debuggerd_fallback.cpp Normal file
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@ -0,0 +1,48 @@
/*
* 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 <stddef.h>
#include <sys/ucontext.h>
#include <unistd.h>
#include "tombstone.h"
extern "C" void __linker_use_fallback_allocator();
extern "C" bool debuggerd_fallback(ucontext_t* ucontext, siginfo_t* siginfo, void* abort_message) {
// This is incredibly sketchy to do inside of a signal handler, especially when libbacktrace
// uses the C++ standard library throughout, but this code runs in the linker, so we'll be using
// the linker's malloc instead of the libc one. Switch it out for a replacement, just in case.
//
// This isn't the default method of dumping because it can fail in cases such as memory space
// exhaustion.
__linker_use_fallback_allocator();
engrave_tombstone_ucontext(-1, getpid(), gettid(), reinterpret_cast<uintptr_t>(abort_message),
siginfo, ucontext);
return true;
}

35
debuggerd/handler/debuggerd_fallback_nop.cpp Normal file
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@ -0,0 +1,35 @@
/*
* 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 <stddef.h>
#include <sys/ucontext.h>
#include <unistd.h>
extern "C" bool debuggerd_fallback(ucontext_t*, siginfo_t*, void*) {
return false;
}

24
debuggerd/handler/debuggerd_handler.cpp
View File

@ -62,6 +62,8 @@
#define CRASH_DUMP_PATH "/system/bin/" CRASH_DUMP_NAME
extern "C" bool debuggerd_fallback(ucontext_t*, siginfo_t*, void*);
static debuggerd_callbacks_t g_callbacks;
// Mutex to ensure only one crashing thread dumps itself.
@ -329,7 +331,7 @@ static void resend_signal(siginfo_t* info, bool crash_dump_started) {
// Handler that does crash dumping by forking and doing the processing in the child.
// Do this by ptracing the relevant thread, and then execing debuggerd to do the actual dump.
static void debuggerd_signal_handler(int signal_number, siginfo_t* info, void*) {
static void debuggerd_signal_handler(int signal_number, siginfo_t* info, void* context) {
int ret = pthread_mutex_lock(&crash_mutex);
if (ret != 0) {
__libc_format_log(ANDROID_LOG_INFO, "libc", "pthread_mutex_lock failed: %s", strerror(ret));
@ -359,18 +361,22 @@ static void debuggerd_signal_handler(int signal_number, siginfo_t* info, void*)
log_signal_summary(signal_number, info);
if (prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0) == 1) {
// The process has NO_NEW_PRIVS enabled, so we can't transition to the crash_dump context.
__libc_format_log(ANDROID_LOG_INFO, "libc",
"Suppressing debuggerd output because prctl(PR_GET_NO_NEW_PRIVS)==1");
resend_signal(info, false);
return;
}
void* abort_message = nullptr;
if (g_callbacks.get_abort_message) {
abort_message = g_callbacks.get_abort_message();
}
if (prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0) == 1) {
ucontext_t* ucontext = static_cast<ucontext_t*>(context);
if (signal_number == DEBUGGER_SIGNAL || !debuggerd_fallback(ucontext, info, abort_message)) {
// The process has NO_NEW_PRIVS enabled, so we can't transition to the crash_dump context.
__libc_format_log(ANDROID_LOG_INFO, "libc",
"Suppressing debuggerd output because prctl(PR_GET_NO_NEW_PRIVS)==1");
}
resend_signal(info, false);
return;
}
// Populate si_value with the abort message address, if found.
if (abort_message) {
info->si_value.sival_ptr = abort_message;

7
debuggerd/libdebuggerd/include/tombstone.h
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@ -35,8 +35,11 @@ int open_tombstone(std::string* path);
/* Creates a tombstone file and writes the crash dump to it. */
void engrave_tombstone(int tombstone_fd, BacktraceMap* map,
const OpenFilesList& open_files, pid_t pid, pid_t tid,
const std::set<pid_t>& siblings, uintptr_t abort_msg_address,
const OpenFilesList* open_files, pid_t pid, pid_t tid,
const std::set<pid_t>* siblings, uintptr_t abort_msg_address,
std::string* amfd_data);
void engrave_tombstone_ucontext(int tombstone_fd, pid_t pid, pid_t tid, uintptr_t abort_msg_address,
siginfo_t* siginfo, ucontext_t* ucontext);
#endif // _DEBUGGERD_TOMBSTONE_H

66
debuggerd/libdebuggerd/tombstone.cpp
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@ -220,14 +220,8 @@ static void dump_probable_cause(log_t* log, const siginfo_t& si) {
if (!cause.empty()) _LOG(log, logtype::HEADER, "Cause: %s\n", cause.c_str());
}
static void dump_signal_info(log_t* log, pid_t tid) {
siginfo_t si;
memset(&si, 0, sizeof(si));
if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) == -1) {
ALOGE("cannot get siginfo: %s\n", strerror(errno));
return;
}
static void dump_signal_info(log_t* log, const siginfo_t* siginfo) {
const siginfo_t& si = *siginfo;
char addr_desc[32]; // ", fault addr 0x1234"
if (signal_has_si_addr(si.si_signo, si.si_code)) {
snprintf(addr_desc, sizeof(addr_desc), "%p", si.si_addr);
@ -241,6 +235,17 @@ static void dump_signal_info(log_t* log, pid_t tid) {
dump_probable_cause(log, si);
}
static void dump_signal_info(log_t* log, pid_t tid) {
siginfo_t si;
memset(&si, 0, sizeof(si));
if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si) == -1) {
ALOGE("cannot get siginfo: %s\n", strerror(errno));
return;
}
dump_signal_info(log, &si);
}
static void dump_thread_info(log_t* log, pid_t pid, pid_t tid) {
char path[64];
char threadnamebuf[1024];
@ -649,8 +654,8 @@ static void dump_logs(log_t* log, pid_t pid, unsigned int tail) {
// Dumps all information about the specified pid to the tombstone.
static void dump_crash(log_t* log, BacktraceMap* map,
const OpenFilesList& open_files, pid_t pid, pid_t tid,
const std::set<pid_t>& siblings, uintptr_t abort_msg_address) {
const OpenFilesList* open_files, pid_t pid, pid_t tid,
const std::set<pid_t>* siblings, uintptr_t abort_msg_address) {
// don't copy log messages to tombstone unless this is a dev device
char value[PROPERTY_VALUE_MAX];
property_get("ro.debuggable", value, "0");
@ -664,14 +669,16 @@ static void dump_crash(log_t* log, BacktraceMap* map,
dump_logs(log, pid, 5);
}
if (!siblings.empty()) {
for (pid_t sibling : siblings) {
if (siblings && !siblings->empty()) {
for (pid_t sibling : *siblings) {
dump_thread(log, pid, sibling, map, 0, false);
}
}
_LOG(log, logtype::OPEN_FILES, "\nopen files:\n");
dump_open_files_list_to_log(open_files, log, " ");
if (open_files) {
_LOG(log, logtype::OPEN_FILES, "\nopen files:\n");
dump_open_files_list_to_log(*open_files, log, " ");
}
if (want_logs) {
dump_logs(log, pid, 0);
@ -732,19 +739,34 @@ int open_tombstone(std::string* out_path) {
}
void engrave_tombstone(int tombstone_fd, BacktraceMap* map,
const OpenFilesList& open_files, pid_t pid, pid_t tid,
const std::set<pid_t>& siblings, uintptr_t abort_msg_address,
const OpenFilesList* open_files, pid_t pid, pid_t tid,
const std::set<pid_t>* siblings, uintptr_t abort_msg_address,
std::string* amfd_data) {
log_t log;
log.current_tid = tid;
log.crashed_tid = tid;
if (tombstone_fd < 0) {
ALOGE("debuggerd: skipping tombstone write, nothing to do.\n");
return;
}
log.tfd = tombstone_fd;
log.amfd_data = amfd_data;
dump_crash(&log, map, open_files, pid, tid, siblings, abort_msg_address);
}
void engrave_tombstone_ucontext(int tombstone_fd, pid_t pid, pid_t tid, uintptr_t abort_msg_address,
siginfo_t* siginfo, ucontext_t* ucontext) {
log_t log;
log.current_tid = tid;
log.crashed_tid = tid;
log.tfd = tombstone_fd;
log.amfd_data = nullptr;
dump_thread_info(&log, pid, tid);
dump_signal_info(&log, siginfo);
std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid));
dump_abort_message(backtrace.get(), &log, abort_msg_address);
// TODO: Dump registers from the ucontext.
if (backtrace->Unwind(0, ucontext)) {
dump_backtrace_and_stack(backtrace.get(), &log);
} else {
ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
}
}