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platform_system_core
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Merge "Improve crasher." am: dbfb20bda4 

am: b7ceb2397e

Change-Id: I2c8579a6f7b8cb636923703ce9551a51a095b19f
This commit is contained in:
Elliott Hughes 2016-12-15 23:23:34 +00:00 committed by android-build-merger
parent 1ad4090e4e b7ceb2397e
commit ced63cee3c
2 changed files with 120 additions and 126 deletions
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7
debuggerd/Android.mk
View File

@ -52,7 +52,7 @@ LOCAL_MULTILIB := both
include $(BUILD_EXECUTABLE)
crasher_cppflags := $(common_cppflags) -fstack-protector-all -Wno-free-nonheap-object -Wno-date-time
crasher_cppflags := $(common_cppflags) -O0 -fstack-protector-all -Wno-free-nonheap-object
include $(CLEAR_VARS)
LOCAL_SRC_FILES := crasher.cpp
@ -65,7 +65,7 @@ LOCAL_SRC_FILES_x86_64 := x86_64/crashglue.S
LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
LOCAL_MODULE_TAGS := optional
LOCAL_CPPFLAGS := $(crasher_cppflags)
LOCAL_SHARED_LIBRARIES := libcutils liblog
LOCAL_SHARED_LIBRARIES := libbase liblog
# The arm emulator has VFP but not VFPv3-D32.
ifeq ($(ARCH_ARM_HAVE_VFP_D32),true)
@ -91,7 +91,6 @@ LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES)
LOCAL_MODULE_TAGS := optional
LOCAL_CPPFLAGS := $(crasher_cppflags) -DSTATIC_CRASHER
LOCAL_FORCE_STATIC_EXECUTABLE := true
LOCAL_SHARED_LIBRARIES := libcutils liblog
# The arm emulator has VFP but not VFPv3-D32.
ifeq ($(ARCH_ARM_HAVE_VFP_D32),true)
@ -103,7 +102,7 @@ LOCAL_MODULE_STEM_32 := static_crasher
LOCAL_MODULE_STEM_64 := static_crasher64
LOCAL_MULTILIB := both
LOCAL_STATIC_LIBRARIES := libdebuggerd_client libcutils liblog
LOCAL_STATIC_LIBRARIES := libdebuggerd_client libbase liblog
include $(BUILD_EXECUTABLE)

239
debuggerd/crasher.cpp
View File

@ -17,47 +17,43 @@
#define LOG_TAG "crasher"
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/cdefs.h>
#include <sys/mman.h>
#include <sys/ptrace.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
// We test both kinds of logging.
#include <android/log.h>
#include <cutils/sockets.h>
#include <android-base/logging.h>
#if defined(STATIC_CRASHER)
#include "debuggerd/client.h"
#endif
#ifndef __unused
#define __unused __attribute__((__unused__))
#endif
#define noinline __attribute__((__noinline__))
extern const char* __progname;
// Avoid name mangling so that stacks are more readable.
extern "C" {
extern "C" void crash1(void);
extern "C" void crashnostack(void);
void crash1(void);
void crashnostack(void);
static int do_action(const char* arg);
int do_action(const char* arg);
static void maybe_abort() {
noinline void maybe_abort() {
if (time(0) != 42) {
abort();
}
}
static char* smash_stack_dummy_buf;
__attribute__ ((noinline)) static void smash_stack_dummy_function(volatile int* plen) {
char* smash_stack_dummy_buf;
noinline void smash_stack_dummy_function(volatile int* plen) {
smash_stack_dummy_buf[*plen] = 0;
}
@ -65,8 +61,8 @@ __attribute__ ((noinline)) static void smash_stack_dummy_function(volatile int*
// compiler generates the proper stack guards around this function.
// Assign local array address to global variable to force stack guards.
// Use another noinline function to corrupt the stack.
__attribute__ ((noinline)) static int smash_stack(volatile int* plen) {
printf("%s: deliberately corrupting stack...\n", __progname);
noinline int smash_stack(volatile int* plen) {
printf("%s: deliberately corrupting stack...\n", getprogname());
char buf[128];
smash_stack_dummy_buf = buf;
@ -75,91 +71,107 @@ __attribute__ ((noinline)) static int smash_stack(volatile int* plen) {
return 0;
}
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Winfinite-recursion"
#endif
static void* global = 0; // So GCC doesn't optimize the tail recursion out of overflow_stack.
void* global = 0; // So GCC doesn't optimize the tail recursion out of overflow_stack.
__attribute__((noinline)) static void overflow_stack(void* p) {
noinline void overflow_stack(void* p) {
void* buf[1];
buf[0] = p;
global = buf;
overflow_stack(&buf);
}
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
static void *noisy(void *x)
{
char c = (uintptr_t) x;
for(;;) {
usleep(250*1000);
write(2, &c, 1);
if(c == 'C') *((volatile unsigned*) 0) = 42;
}
return NULL;
noinline void* thread_callback(void* raw_arg) {
const char* arg = reinterpret_cast<const char*>(raw_arg);
return reinterpret_cast<void*>(static_cast<uintptr_t>(do_action(arg)));
}
static int ctest()
{
pthread_t thr;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
pthread_create(&thr, &attr, noisy, (void*) 'A');
pthread_create(&thr, &attr, noisy, (void*) 'B');
pthread_create(&thr, &attr, noisy, (void*) 'C');
for(;;) ;
return 0;
}
static void* thread_callback(void* raw_arg)
{
return (void*) (uintptr_t) do_action((const char*) raw_arg);
}
static int do_action_on_thread(const char* arg)
{
noinline int do_action_on_thread(const char* arg) {
pthread_t t;
pthread_create(&t, NULL, thread_callback, (void*) arg);
void* result = NULL;
pthread_create(&t, nullptr, thread_callback, const_cast<char*>(arg));
void* result = nullptr;
pthread_join(t, &result);
return (int) (uintptr_t) result;
return reinterpret_cast<uintptr_t>(result);
}
__attribute__((noinline)) static int crash3(int a) {
*((int*) 0xdead) = a;
noinline int crash3(int a) {
*reinterpret_cast<int*>(0xdead) = a;
return a*4;
}
__attribute__((noinline)) static int crash2(int a) {
noinline int crash2(int a) {
a = crash3(a) + 2;
return a*3;
}
__attribute__((noinline)) static int crash(int a) {
noinline int crash(int a) {
a = crash2(a) + 1;
return a*2;
}
static void abuse_heap() {
noinline void abuse_heap() {
char buf[16];
free((void*) buf); // GCC is smart enough to warn about this, but we're doing it deliberately.
free(buf); // GCC is smart enough to warn about this, but we're doing it deliberately.
}
static void sigsegv_non_null() {
noinline void sigsegv_non_null() {
int* a = (int *)(&do_action);
*a = 42;
}
static int do_action(const char* arg)
{
fprintf(stderr, "%s: init pid=%d tid=%d\n", __progname, getpid(), gettid());
noinline void fprintf_null() {
fprintf(nullptr, "oops");
}
noinline void readdir_null() {
readdir(nullptr);
}
noinline int strlen_null() {
char* sneaky_null = nullptr;
return strlen(sneaky_null);
}
static int usage() {
fprintf(stderr, "usage: %s KIND\n", getprogname());
fprintf(stderr, "\n");
fprintf(stderr, "where KIND is:\n");
fprintf(stderr, " smash-stack overwrite a -fstack-protector guard\n");
fprintf(stderr, " stack-overflow recurse until the stack overflows\n");
fprintf(stderr, " heap-corruption cause a libc abort by corrupting the heap\n");
fprintf(stderr, " heap-usage cause a libc abort by abusing a heap function\n");
fprintf(stderr, " nostack crash with a NULL stack pointer\n");
fprintf(stderr, " abort call abort()\n");
fprintf(stderr, " assert call assert() without a function\n");
fprintf(stderr, " assert2 call assert() with a function\n");
fprintf(stderr, " exit call exit(1)\n");
fprintf(stderr, " fortify fail a _FORTIFY_SOURCE check\n");
fprintf(stderr, " LOG_ALWAYS_FATAL call liblog LOG_ALWAYS_FATAL\n");
fprintf(stderr, " LOG_ALWAYS_FATAL_IF call liblog LOG_ALWAYS_FATAL_IF\n");
fprintf(stderr, " LOG-FATAL call libbase LOG(FATAL)\n");
fprintf(stderr, " SIGFPE cause a SIGFPE\n");
fprintf(stderr, " SIGSEGV cause a SIGSEGV at address 0x0 (synonym: crash)\n");
fprintf(stderr, " SIGSEGV-non-null cause a SIGSEGV at a non-zero address\n");
fprintf(stderr, " SIGSEGV-unmapped mmap/munmap a region of memory and then attempt to access it\n");
fprintf(stderr, " SIGTRAP cause a SIGTRAP\n");
fprintf(stderr, " fprintf-NULL pass a null pointer to fprintf\n");
fprintf(stderr, " readdir-NULL pass a null pointer to readdir\n");
fprintf(stderr, " strlen-NULL pass a null pointer to strlen\n");
fprintf(stderr, "\n");
fprintf(stderr, "prefix any of the above with 'thread-' to run on a new thread\n");
fprintf(stderr, "prefix any of the above with 'exhaustfd-' to exhaust\n");
fprintf(stderr, "all available file descriptors before crashing.\n");
fprintf(stderr, "prefix any of the above with 'wait-' to wait until input is received on stdin\n");
return EXIT_FAILURE;
}
noinline int do_action(const char* arg) {
// Prefixes.
if (!strncmp(arg, "wait-", strlen("wait-"))) {
char buf[1];
TEMP_FAILURE_RETRY(read(STDIN_FILENO, buf, sizeof(buf)));
@ -172,82 +184,66 @@ static int do_action(const char* arg)
return do_action(arg + strlen("exhaustfd-"));
} else if (!strncmp(arg, "thread-", strlen("thread-"))) {
return do_action_on_thread(arg + strlen("thread-"));
} else if (!strcmp(arg, "SIGSEGV-non-null")) {
}
// Actions.
if (!strcasecmp(arg, "SIGSEGV-non-null")) {
sigsegv_non_null();
} else if (!strcmp(arg, "smash-stack")) {
} else if (!strcasecmp(arg, "smash-stack")) {
volatile int len = 128;
return smash_stack(&len);
} else if (!strcmp(arg, "stack-overflow")) {
overflow_stack(NULL);
} else if (!strcmp(arg, "nostack")) {
} else if (!strcasecmp(arg, "stack-overflow")) {
overflow_stack(nullptr);
} else if (!strcasecmp(arg, "nostack")) {
crashnostack();
} else if (!strcmp(arg, "ctest")) {
return ctest();
} else if (!strcmp(arg, "exit")) {
} else if (!strcasecmp(arg, "exit")) {
exit(1);
} else if (!strcmp(arg, "crash") || !strcmp(arg, "SIGSEGV")) {
} else if (!strcasecmp(arg, "crash") || !strcmp(arg, "SIGSEGV")) {
return crash(42);
} else if (!strcmp(arg, "abort")) {
} else if (!strcasecmp(arg, "abort")) {
maybe_abort();
} else if (!strcmp(arg, "assert")) {
} else if (!strcasecmp(arg, "assert")) {
__assert("some_file.c", 123, "false");
} else if (!strcmp(arg, "assert2")) {
} else if (!strcasecmp(arg, "assert2")) {
__assert2("some_file.c", 123, "some_function", "false");
} else if (!strcmp(arg, "fortify")) {
} else if (!strcasecmp(arg, "fortify")) {
char buf[10];
__read_chk(-1, buf, 32, 10);
while (true) pause();
} else if (!strcmp(arg, "LOG_ALWAYS_FATAL")) {
} else if (!strcasecmp(arg, "LOG(FATAL)")) {
LOG(FATAL) << "hello " << 123;
} else if (!strcasecmp(arg, "LOG_ALWAYS_FATAL")) {
LOG_ALWAYS_FATAL("hello %s", "world");
} else if (!strcmp(arg, "LOG_ALWAYS_FATAL_IF")) {
} else if (!strcasecmp(arg, "LOG_ALWAYS_FATAL_IF")) {
LOG_ALWAYS_FATAL_IF(true, "hello %s", "world");
} else if (!strcmp(arg, "SIGFPE")) {
} else if (!strcasecmp(arg, "SIGFPE")) {
raise(SIGFPE);
return EXIT_SUCCESS;
} else if (!strcmp(arg, "SIGTRAP")) {
} else if (!strcasecmp(arg, "SIGTRAP")) {
raise(SIGTRAP);
return EXIT_SUCCESS;
} else if (!strcmp(arg, "heap-usage")) {
} else if (!strcasecmp(arg, "fprintf-NULL")) {
fprintf_null();
} else if (!strcasecmp(arg, "readdir-NULL")) {
readdir_null();
} else if (!strcasecmp(arg, "strlen-NULL")) {
return strlen_null();
} else if (!strcasecmp(arg, "heap-usage")) {
abuse_heap();
} else if (!strcmp(arg, "SIGSEGV-unmapped")) {
char* map = reinterpret_cast<char*>(mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0));
} else if (!strcasecmp(arg, "SIGSEGV-unmapped")) {
char* map = reinterpret_cast<char*>(mmap(nullptr, sizeof(int), PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, -1, 0));
munmap(map, sizeof(int));
map[0] = '8';
} else {
return usage();
}
fprintf(stderr, "%s OP\n", __progname);
fprintf(stderr, "where OP is:\n");
fprintf(stderr, " smash-stack overwrite a stack-guard canary\n");
fprintf(stderr, " stack-overflow recurse until the stack overflows\n");
fprintf(stderr, " heap-corruption cause a libc abort by corrupting the heap\n");
fprintf(stderr, " heap-usage cause a libc abort by abusing a heap function\n");
fprintf(stderr, " nostack crash with a NULL stack pointer\n");
fprintf(stderr, " ctest (obsoleted by thread-crash?)\n");
fprintf(stderr, " exit call exit(1)\n");
fprintf(stderr, " abort call abort()\n");
fprintf(stderr, " assert call assert() without a function\n");
fprintf(stderr, " assert2 call assert() with a function\n");
fprintf(stderr, " fortify fail a _FORTIFY_SOURCE check\n");
fprintf(stderr, " LOG_ALWAYS_FATAL call LOG_ALWAYS_FATAL\n");
fprintf(stderr, " LOG_ALWAYS_FATAL_IF call LOG_ALWAYS_FATAL\n");
fprintf(stderr, " SIGFPE cause a SIGFPE\n");
fprintf(stderr, " SIGSEGV cause a SIGSEGV at address 0x0 (synonym: crash)\n");
fprintf(stderr, " SIGSEGV-non-null cause a SIGSEGV at a non-zero address\n");
fprintf(stderr, " SIGSEGV-unmapped mmap/munmap a region of memory and then attempt to access it\n");
fprintf(stderr, " SIGTRAP cause a SIGTRAP\n");
fprintf(stderr, "prefix any of the above with 'thread-' to not run\n");
fprintf(stderr, "on the process' main thread.\n");
fprintf(stderr, "prefix any of the above with 'exhaustfd-' to exhaust\n");
fprintf(stderr, "all available file descriptors before crashing.\n");
fprintf(stderr, "prefix any of the above with 'wait-' to wait until input is received on stdin\n");
fprintf(stderr, "%s: exiting normally!\n", getprogname());
return EXIT_SUCCESS;
}
int main(int argc, char **argv)
{
fprintf(stderr, "%s: built at " __TIME__ "!@\n", __progname);
int main(int argc, char** argv) {
#if defined(STATIC_CRASHER)
debuggerd_callbacks_t callbacks = {
.get_abort_message = []() {
@ -265,11 +261,10 @@ int main(int argc, char **argv)
debuggerd_init(&callbacks);
#endif
if (argc > 1) {
return do_action(argv[1]);
} else {
crash1();
}
if (argc == 1) crash1();
else if (argc == 2) return do_action(argv[1]);
return 0;
return usage();
}
};