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Allow out-of-process minidump generation to work on processes of a different CPU architecture

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R=mark at http://breakpad.appspot.com/241001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@746 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek@gmail.com 2010-12-15 21:55:56 +00:00
parent 0d9bd40775
commit 0344a368de
10 changed files with 1262 additions and 653 deletions
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512
src/client/mac/handler/dynamic_images.cc
View file

@ -27,6 +27,8 @@
// (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 "client/mac/handler/dynamic_images.h"
extern "C" { // needed to compile on Leopard
#include <mach-o/nlist.h>
#include <stdlib.h>
@ -37,11 +39,17 @@ extern "C" { // needed to compile on Leopard
#include <assert.h>
#include <dlfcn.h>
#include <mach/mach_vm.h>
#include <sys/sysctl.h>
#include <algorithm>
#include "client/mac/handler/dynamic_images.h"
#include <string>
#include <vector>
namespace google_breakpad {
using std::string;
using std::vector;
//==============================================================================
// Returns the size of the memory region containing |address| and the
// number of bytes from |address| to the end of the region.
@ -51,7 +59,7 @@ namespace google_breakpad {
// straddle two vm regions.
//
static mach_vm_size_t GetMemoryRegionSize(task_port_t target_task,
const void* address,
const uint64_t address,
mach_vm_size_t *size_to_end) {
mach_vm_address_t region_base = (mach_vm_address_t)address;
mach_vm_size_t region_size;
@ -116,8 +124,8 @@ static mach_vm_size_t GetMemoryRegionSize(task_port_t target_task,
//
// Warning! This will not read any strings longer than kMaxStringLength-1
//
static void* ReadTaskString(task_port_t target_task,
const void* address) {
static string ReadTaskString(task_port_t target_task,
const uint64_t address) {
// The problem is we don't know how much to read until we know how long
// the string is. And we don't know how long the string is, until we've read
// the memory! So, we'll try to read kMaxStringLength bytes
@ -129,68 +137,140 @@ static void* ReadTaskString(task_port_t target_task,
mach_vm_size_t size_to_read =
size_to_end > kMaxStringLength ? kMaxStringLength : size_to_end;
kern_return_t kr;
return ReadTaskMemory(target_task, address, (size_t)size_to_read, &kr);
vector<uint8_t> bytes;
if (ReadTaskMemory(target_task, address, (size_t)size_to_read, bytes) !=
KERN_SUCCESS)
return string();
return string(reinterpret_cast<const char*>(&bytes[0]));
}
return NULL;
return string();
}
//==============================================================================
// Reads an address range from another task. A block of memory is malloced
// and should be freed by the caller.
void* ReadTaskMemory(task_port_t target_task,
const void* address,
size_t length,
kern_return_t *kr) {
void* result = NULL;
// Reads an address range from another task. The bytes read will be returned
// in bytes, which will be resized as necessary.
kern_return_t ReadTaskMemory(task_port_t target_task,
const uint64_t address,
size_t length,
vector<uint8_t> &bytes) {
int systemPageSize = getpagesize();
// use the negative of the page size for the mask to find the page address
mach_vm_address_t page_address =
reinterpret_cast<mach_vm_address_t>(address) & (-systemPageSize);
mach_vm_address_t page_address = address & (-systemPageSize);
mach_vm_address_t last_page_address =
(reinterpret_cast<mach_vm_address_t>(address) + length +
(systemPageSize - 1)) & (-systemPageSize);
(address + length + (systemPageSize - 1)) & (-systemPageSize);
mach_vm_size_t page_size = last_page_address - page_address;
uint8_t* local_start;
uint32_t local_length;
kern_return_t r;
kern_return_t r = mach_vm_read(target_task,
page_address,
page_size,
reinterpret_cast<vm_offset_t*>(&local_start),
&local_length);
r = mach_vm_read(target_task,
page_address,
page_size,
reinterpret_cast<vm_offset_t*>(&local_start),
&local_length);
if (r != KERN_SUCCESS)
return r;
if (kr != NULL) {
*kr = r;
}
if (r == KERN_SUCCESS) {
result = malloc(length);
if (result != NULL) {
memcpy(result,
&local_start[(mach_vm_address_t)address - page_address],
length);
}
mach_vm_deallocate(mach_task_self(), (uintptr_t)local_start, local_length);
}
return result;
bytes.resize(length);
memcpy(&bytes[0],
&local_start[(mach_vm_address_t)address - page_address],
length);
mach_vm_deallocate(mach_task_self(), (uintptr_t)local_start, local_length);
return KERN_SUCCESS;
}
#pragma mark -
//==============================================================================
// Traits structs for specializing function templates to handle
// 32-bit/64-bit Mach-O files.
struct MachO32 {
typedef mach_header mach_header_type;
typedef segment_command mach_segment_command_type;
typedef dyld_image_info32 dyld_image_info;
typedef dyld_all_image_infos32 dyld_all_image_infos;
typedef struct nlist nlist_type;
static const uint32_t magic = MH_MAGIC;
static const uint32_t segment_load_command = LC_SEGMENT;
};
struct MachO64 {
typedef mach_header_64 mach_header_type;
typedef segment_command_64 mach_segment_command_type;
typedef dyld_image_info64 dyld_image_info;
typedef dyld_all_image_infos64 dyld_all_image_infos;
typedef struct nlist_64 nlist_type;
static const uint32_t magic = MH_MAGIC_64;
static const uint32_t segment_load_command = LC_SEGMENT_64;
};
template<typename MachBits>
bool FindTextSection(DynamicImage& image) {
typedef typename MachBits::mach_header_type mach_header_type;
typedef typename MachBits::mach_segment_command_type
mach_segment_command_type;
const mach_header_type* header =
reinterpret_cast<const mach_header_type*>(&image.header_[0]);
if(header->magic != MachBits::magic) {
return false;
}
const struct load_command *cmd =
reinterpret_cast<const struct load_command *>(header + 1);
bool found_text_section = false;
bool found_dylib_id_command = false;
for (unsigned int i = 0; cmd && (i < header->ncmds); ++i) {
if (!found_text_section) {
if (cmd->cmd == MachBits::segment_load_command) {
const mach_segment_command_type *seg =
reinterpret_cast<const mach_segment_command_type *>(cmd);
if (!strcmp(seg->segname, "__TEXT")) {
image.vmaddr_ = seg->vmaddr;
image.vmsize_ = seg->vmsize;
image.slide_ = 0;
if (seg->fileoff == 0 && seg->filesize != 0) {
image.slide_ =
(uintptr_t)image.GetLoadAddress() - (uintptr_t)seg->vmaddr;
}
found_text_section = true;
}
}
}
if (!found_dylib_id_command) {
if (cmd->cmd == LC_ID_DYLIB) {
const struct dylib_command *dc =
reinterpret_cast<const struct dylib_command *>(cmd);
image.version_ = dc->dylib.current_version;
found_dylib_id_command = true;
}
}
if (found_dylib_id_command && found_text_section) {
return true;
}
cmd = reinterpret_cast<const struct load_command *>
(reinterpret_cast<const char *>(cmd) + cmd->cmdsize);
}
return false;
}
//==============================================================================
// Initializes vmaddr_, vmsize_, and slide_
void DynamicImage::CalculateMemoryAndVersionInfo() {
breakpad_mach_header *header = GetMachHeader();
// unless we can process the header, ensure that calls to
// IsValid() will return false
vmaddr_ = 0;
@ -198,78 +278,29 @@ void DynamicImage::CalculateMemoryAndVersionInfo() {
slide_ = 0;
version_ = 0;
bool foundTextSection = false;
bool foundDylibIDCommand = false;
#if __LP64__
if(header->magic != MH_MAGIC_64) {
return;
}
#else
if(header->magic != MH_MAGIC) {
return;
}
#endif
#ifdef __LP64__
const uint32_t segmentLoadCommand = LC_SEGMENT_64;
#else
const uint32_t segmentLoadCommand = LC_SEGMENT;
#endif
const struct load_command *cmd =
reinterpret_cast<const struct load_command *>(header + 1);
for (unsigned int i = 0; cmd && (i < header->ncmds); ++i) {
if (!foundTextSection) {
if (cmd->cmd == segmentLoadCommand) {
const breakpad_mach_segment_command *seg =
reinterpret_cast<const breakpad_mach_segment_command *>(cmd);
if (!strcmp(seg->segname, "__TEXT")) {
vmaddr_ = seg->vmaddr;
vmsize_ = seg->vmsize;
slide_ = 0;
if (seg->fileoff == 0 && seg->filesize != 0) {
slide_ = (uintptr_t)GetLoadAddress() - (uintptr_t)seg->vmaddr;
}
foundTextSection = true;
}
}
}
if (!foundDylibIDCommand) {
if (cmd->cmd == LC_ID_DYLIB) {
const struct dylib_command *dc =
reinterpret_cast<const struct dylib_command *>(cmd);
version_ = dc->dylib.current_version;
foundDylibIDCommand = true;
}
}
if (foundDylibIDCommand && foundTextSection) {
return;
}
cmd = reinterpret_cast<const struct load_command *>
(reinterpret_cast<const char *>(cmd) + cmd->cmdsize);
}
// The function template above does all the real work.
if (Is64Bit())
FindTextSection<MachO64>(*this);
else
FindTextSection<MachO32>(*this);
}
void DynamicImage::Print() {
const char *path = GetFilePath();
if (!path) {
path = "(unknown)";
}
printf("%p: %s\n", GetLoadAddress(), path);
breakpad_mach_header *header = GetMachHeader();
MachHeader(*header).Print();
printf("vmaddr\t\t: %p\n", reinterpret_cast<void*>(GetVMAddr()));
printf("vmsize\t\t: %llu\n", GetVMSize());
printf("slide\t\t: %td\n", GetVMAddrSlide());
//==============================================================================
// The helper function template abstracts the 32/64-bit differences.
template<typename MachBits>
uint32_t GetFileTypeFromHeader(DynamicImage& image) {
typedef typename MachBits::mach_header_type mach_header_type;
const mach_header_type* header =
reinterpret_cast<const mach_header_type*>(&image.header_[0]);
return header->filetype;
}
uint32_t DynamicImage::GetFileType() {
if (Is64Bit())
return GetFileTypeFromHeader<MachO64>(*this);
return GetFileTypeFromHeader<MachO32>(*this);
}
#pragma mark -
@ -277,144 +308,158 @@ void DynamicImage::Print() {
//==============================================================================
// Loads information about dynamically loaded code in the given task.
DynamicImages::DynamicImages(mach_port_t task)
: task_(task), image_list_() {
: task_(task),
cpu_type_(DetermineTaskCPUType(task)),
image_list_() {
ReadImageInfoForTask();
}
void* DynamicImages::GetDyldAllImageInfosPointer() {
const char *imageSymbolName = "_dyld_all_image_infos";
const char *dyldPath = "/usr/lib/dyld";
#ifndef __LP64__
struct nlist l[8];
memset(l, 0, sizeof(l) );
template<typename MachBits>
static uint64_t LookupSymbol(const char* symbol_name,
const char* filename,
cpu_type_t cpu_type) {
typedef typename MachBits::nlist_type nlist_type;
// First we lookup the address of the "_dyld_all_image_infos" struct
// which lives in "dyld". This structure contains information about all
// of the loaded dynamic images.
struct nlist &list = l[0];
list.n_un.n_name = const_cast<char *>(imageSymbolName);
nlist(dyldPath,&list);
if(list.n_value) {
return reinterpret_cast<void*>(list.n_value);
}
return NULL;
#else
struct nlist_64 l[8];
struct nlist_64 &list = l[0];
memset(l, 0, sizeof(l) );
const char *symbolNames[2] = { imageSymbolName, "\0" };
int invalidEntriesCount = breakpad_nlist_64(dyldPath,&list,symbolNames);
nlist_type symbol_info[8] = {};
const char *symbolNames[2] = { symbol_name, "\0" };
nlist_type &list = symbol_info[0];
int invalidEntriesCount = breakpad_nlist(filename,
&list,
symbolNames,
cpu_type);
if(invalidEntriesCount != 0) {
return NULL;
return 0;
}
assert(list.n_value);
return reinterpret_cast<void*>(list.n_value);
#endif
assert(list.n_value);
return list.n_value;
}
uint64_t DynamicImages::GetDyldAllImageInfosPointer() {
const char *imageSymbolName = "_dyld_all_image_infos";
const char *dyldPath = "/usr/lib/dyld";
if (Is64Bit())
return LookupSymbol<MachO64>(imageSymbolName, dyldPath, cpu_type_);
return LookupSymbol<MachO32>(imageSymbolName, dyldPath, cpu_type_);
}
//==============================================================================
// This code was written using dyld_debug.c (from Darwin) as a guide.
void DynamicImages::ReadImageInfoForTask() {
void *imageList = GetDyldAllImageInfosPointer();
if (imageList) {
kern_return_t kr;
// Read the structure inside of dyld that contains information about
// loaded images. We're reading from the desired task's address space.
template<typename MachBits>
void ReadImageInfo(DynamicImages& images,
uint64_t image_list_address) {
typedef typename MachBits::dyld_image_info dyld_image_info;
typedef typename MachBits::dyld_all_image_infos dyld_all_image_infos;
typedef typename MachBits::mach_header_type mach_header_type;
// Here we make the assumption that dyld loaded at the same address in
// the crashed process vs. this one. This is an assumption made in
// "dyld_debug.c" and is said to be nearly always valid.
dyld_all_image_infos *dyldInfo = reinterpret_cast<dyld_all_image_infos*>
(ReadTaskMemory(task_,
reinterpret_cast<void*>(imageList),
sizeof(dyld_all_image_infos), &kr));
// Read the structure inside of dyld that contains information about
// loaded images. We're reading from the desired task's address space.
if (dyldInfo) {
// number of loaded images
int count = dyldInfo->infoArrayCount;
// Here we make the assumption that dyld loaded at the same address in
// the crashed process vs. this one. This is an assumption made in
// "dyld_debug.c" and is said to be nearly always valid.
vector<uint8_t> dyld_all_info_bytes;
if (ReadTaskMemory(images.task_,
image_list_address,
sizeof(dyld_all_image_infos),
dyld_all_info_bytes) != KERN_SUCCESS)
return;
// Read an array of dyld_image_info structures each containing
// information about a loaded image.
dyld_image_info *infoArray = reinterpret_cast<dyld_image_info*>
(ReadTaskMemory(task_,
dyldInfo->infoArray,
count*sizeof(dyld_image_info), &kr));
dyld_all_image_infos *dyldInfo =
reinterpret_cast<dyld_all_image_infos*>(&dyld_all_info_bytes[0]);
image_list_.reserve(count);
// number of loaded images
int count = dyldInfo->infoArrayCount;
for (int i = 0; i < count; ++i) {
dyld_image_info &info = infoArray[i];
// Read an array of dyld_image_info structures each containing
// information about a loaded image.
vector<uint8_t> dyld_info_array_bytes;
if (ReadTaskMemory(images.task_,
dyldInfo->infoArray,
count * sizeof(dyld_image_info),
dyld_info_array_bytes) != KERN_SUCCESS)
return;
// First read just the mach_header from the image in the task.
breakpad_mach_header *header = reinterpret_cast<breakpad_mach_header*>
(ReadTaskMemory(task_,
info.load_address_,
sizeof(breakpad_mach_header), &kr));
dyld_image_info *infoArray =
reinterpret_cast<dyld_image_info*>(&dyld_info_array_bytes[0]);
images.image_list_.reserve(count);
if (!header)
break; // bail on this dynamic image
for (int i = 0; i < count; ++i) {
dyld_image_info &info = infoArray[i];
// Now determine the total amount we really want to read based on the
// size of the load commands. We need the header plus all of the
// load commands.
size_t header_size =
sizeof(breakpad_mach_header) + header->sizeofcmds;
// First read just the mach_header from the image in the task.
vector<uint8_t> mach_header_bytes;
if (ReadTaskMemory(images.task_,
info.load_address_,
sizeof(mach_header_type),
mach_header_bytes) != KERN_SUCCESS)
continue; // bail on this dynamic image
free(header);
mach_header_type *header =
reinterpret_cast<mach_header_type*>(&mach_header_bytes[0]);
header = reinterpret_cast<breakpad_mach_header*>
(ReadTaskMemory(task_, info.load_address_, header_size, &kr));
// Now determine the total amount necessary to read the header
// plus all of the load commands.
size_t header_size =
sizeof(mach_header_type) + header->sizeofcmds;
// Read the file name from the task's memory space.
char *file_path = NULL;
if (info.file_path_) {
// Although we're reading kMaxStringLength bytes, it's copied in the
// the DynamicImage constructor below with the correct string length,
// so it's not really wasting memory.
file_path = reinterpret_cast<char*>
(ReadTaskString(task_, info.file_path_));
}
if (ReadTaskMemory(images.task_,
info.load_address_,
header_size,
mach_header_bytes) != KERN_SUCCESS)
continue;
// Create an object representing this image and add it to our list.
DynamicImage *new_image;
new_image = new DynamicImage(header,
header_size,
(breakpad_mach_header*)info.load_address_,
file_path,
info.file_mod_date_,
task_);
header = reinterpret_cast<mach_header_type*>(&mach_header_bytes[0]);
if (new_image->IsValid()) {
image_list_.push_back(DynamicImageRef(new_image));
} else {
delete new_image;
}
if (file_path) {
free(file_path);
}
// Read the file name from the task's memory space.
string file_path;
if (info.file_path_) {
// Although we're reading kMaxStringLength bytes, it's copied in the
// the DynamicImage constructor below with the correct string length,
// so it's not really wasting memory.
file_path = ReadTaskString(images.task_, info.file_path_);
}
free(dyldInfo);
free(infoArray);
// Create an object representing this image and add it to our list.
DynamicImage *new_image;
new_image = new DynamicImage(&mach_header_bytes[0],
header_size,
info.load_address_,
file_path,
info.file_mod_date_,
images.task_,
images.cpu_type_);
// sorts based on loading address
sort(image_list_.begin(), image_list_.end() );
// remove duplicates - this happens in certain strange cases
// You can see it in DashboardClient when Google Gadgets plugin
// is installed. Apple's crash reporter log and gdb "info shared"
// both show the same library multiple times at the same address
vector<DynamicImageRef>::iterator it = unique(image_list_.begin(),
image_list_.end() );
image_list_.erase(it, image_list_.end());
if (new_image->IsValid()) {
images.image_list_.push_back(DynamicImageRef(new_image));
} else {
delete new_image;
}
}
// sorts based on loading address
sort(images.image_list_.begin(), images.image_list_.end());
// remove duplicates - this happens in certain strange cases
// You can see it in DashboardClient when Google Gadgets plugin
// is installed. Apple's crash reporter log and gdb "info shared"
// both show the same library multiple times at the same address
vector<DynamicImageRef>::iterator it = unique(images.image_list_.begin(),
images.image_list_.end());
images.image_list_.erase(it, images.image_list_.end());
}
void DynamicImages::ReadImageInfoForTask() {
uint64_t imageList = GetDyldAllImageInfosPointer();
if (imageList) {
if (Is64Bit())
ReadImageInfo<MachO64>(*this, imageList);
else
ReadImageInfo<MachO32>(*this, imageList);
}
}
@ -436,7 +481,7 @@ int DynamicImages::GetExecutableImageIndex() {
for (int i = 0; i < image_count; ++i) {
DynamicImage *image = GetImage(i);
if (image->GetMachHeader()->filetype == MH_EXECUTE) {
if (image->GetFileType() == MH_EXECUTE) {
return i;
}
}
@ -444,4 +489,27 @@ int DynamicImages::GetExecutableImageIndex() {
return -1;
}
//==============================================================================
// static
cpu_type_t DynamicImages::DetermineTaskCPUType(task_t task) {
if (task == mach_task_self())
return GetNativeCPUType();
int mib[CTL_MAXNAME];
size_t mibLen = CTL_MAXNAME;
int err = sysctlnametomib("sysctl.proc_cputype", mib, &mibLen);
if (err == 0) {
assert(mibLen < CTL_MAXNAME);
pid_for_task(task, &mib[mibLen]);
mibLen += 1;
cpu_type_t cpu_type;
size_t cpuTypeSize = sizeof(cpu_type);
sysctl(mib, mibLen, &cpu_type, &cpuTypeSize, 0, 0);
return cpu_type;
}
return GetNativeCPUType();
}
} // namespace google_breakpad