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1812 lines (1541 loc) · 46.5 KB
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//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//
/*++
Module Name:
debug.c
Abstract:
Implementation of Win32 debugging API functions.
Revision History:
--*/
#ifndef BIT64
#undef _LARGEFILE64_SOURCE
#undef _FILE_OFFSET_BITS
#endif
#include "pal/thread.hpp"
#include "pal/procobj.hpp"
#include "pal/file.hpp"
#include "pal/palinternal.h"
#include "pal/dbgmsg.h"
#include "pal/process.h"
#include "pal/context.h"
#include "pal/debug.h"
#include "pal/misc.h"
#include "pal/malloc.hpp"
#include "pal/module.h"
#include "pal/stackstring.hpp"
#include "pal/virtual.h"
#include <signal.h>
#include <unistd.h>
#if HAVE_PROCFS_CTL
#include <unistd.h>
#elif HAVE_TTRACE // HAVE_PROCFS_CTL
#include <sys/ttrace.h>
#else // HAVE_TTRACE
#include <sys/ptrace.h>
#endif // HAVE_PROCFS_CTL
#if HAVE_VM_READ
#include <mach/mach.h>
#endif // HAVE_VM_READ
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#if HAVE_PROCFS_H
#include <procfs.h>
#endif // HAVE_PROCFS_H
#if HAVE_MACH_EXCEPTIONS
#include "../exception/machexception.h"
#endif // HAVE_MACH_EXCEPTIONS
using namespace CorUnix;
SET_DEFAULT_DEBUG_CHANNEL(DEBUG);
extern "C" void DBG_DebugBreak_End();
#if HAVE_PROCFS_CTL
#define CTL_ATTACH "attach"
#define CTL_DETACH "detach"
#define CTL_WAIT "wait"
#endif // HAVE_PROCFS_CTL
/* ------------------- Constant definitions ----------------------------------*/
#if !HAVE_VM_READ && !HAVE_PROCFS_CTL
const BOOL DBG_ATTACH = TRUE;
const BOOL DBG_DETACH = FALSE;
#endif
static const char PAL_OUTPUTDEBUGSTRING[] = "PAL_OUTPUTDEBUGSTRING";
#ifdef _DEBUG
#define ENABLE_RUN_ON_DEBUG_BREAK 1
#endif // _DEBUG
#ifdef ENABLE_RUN_ON_DEBUG_BREAK
static const char PAL_RUN_ON_DEBUG_BREAK[] = "PAL_RUN_ON_DEBUG_BREAK";
#endif // ENABLE_RUN_ON_DEBUG_BREAK
/* ------------------- Static function prototypes ----------------------------*/
#if !HAVE_VM_READ && !HAVE_PROCFS_CTL && !HAVE_TTRACE
static int
DBGWriteProcMem_Int(DWORD processId, int *addr, int data);
static int
DBGWriteProcMem_IntWithMask(DWORD processId, int *addr, int data,
unsigned int mask);
#endif // !HAVE_VM_READ && !HAVE_PROCFS_CTL && !HAVE_TTRACE
#if !HAVE_VM_READ && !HAVE_PROCFS_CTL
static BOOL
DBGAttachProcess(CPalThread *pThread, HANDLE hProcess, DWORD dwProcessId);
static BOOL
DBGDetachProcess(CPalThread *pThread, HANDLE hProcess, DWORD dwProcessId);
static int
DBGSetProcessAttached(CPalThread *pThread, HANDLE hProcess, BOOL bAttach);
#endif // !HAVE_VM_READ && !HAVE_PROCFS_CTL
extern "C" {
/*++
Function:
FlushInstructionCache
The FlushInstructionCache function flushes the instruction cache for
the specified process.
Remarks
This is a no-op for x86 architectures where the instruction and data
caches are coherent in hardware. For non-X86 architectures, this call
usually maps to a kernel API to flush the D-caches on all processors.
--*/
BOOL
PALAPI
FlushInstructionCache(
IN HANDLE hProcess,
IN LPCVOID lpBaseAddress,
IN SIZE_T dwSize)
{
BOOL Ret;
PERF_ENTRY(FlushInstructionCache);
ENTRY("FlushInstructionCache (hProcess=%p, lpBaseAddress=%p dwSize=%d)\
\n", hProcess, lpBaseAddress, dwSize);
if (lpBaseAddress != NULL)
{
Ret = DBG_FlushInstructionCache(lpBaseAddress, dwSize);
}
else
{
Ret = TRUE;
}
LOGEXIT("FlushInstructionCache returns BOOL %d\n", Ret);
PERF_EXIT(FlushInstructionCache);
return Ret;
}
/*++
Function:
OutputDebugStringA
See MSDN doc.
--*/
VOID
PALAPI
OutputDebugStringA(
IN LPCSTR lpOutputString)
{
PERF_ENTRY(OutputDebugStringA);
ENTRY("OutputDebugStringA (lpOutputString=%p (%s))\n",
lpOutputString?lpOutputString:"NULL",
lpOutputString?lpOutputString:"NULL");
/* as we don't support debug events, we are going to output the debug string
to stderr instead of generating OUT_DEBUG_STRING_EVENT */
if ( (lpOutputString != NULL) &&
(NULL != MiscGetenv(PAL_OUTPUTDEBUGSTRING)))
{
fprintf(stderr, "%s", lpOutputString);
}
LOGEXIT("OutputDebugStringA returns\n");
PERF_EXIT(OutputDebugStringA);
}
/*++
Function:
OutputDebugStringW
See MSDN doc.
--*/
VOID
PALAPI
OutputDebugStringW(
IN LPCWSTR lpOutputString)
{
CHAR *lpOutputStringA;
int strLen;
PERF_ENTRY(OutputDebugStringW);
ENTRY("OutputDebugStringW (lpOutputString=%p (%S))\n",
lpOutputString ? lpOutputString: W16_NULLSTRING,
lpOutputString ? lpOutputString: W16_NULLSTRING);
if (lpOutputString == NULL)
{
OutputDebugStringA("");
goto EXIT;
}
if ((strLen = WideCharToMultiByte(CP_ACP, 0, lpOutputString, -1, NULL, 0,
NULL, NULL))
== 0)
{
ASSERT("failed to get wide chars length\n");
SetLastError(ERROR_INTERNAL_ERROR);
goto EXIT;
}
/* strLen includes the null terminator */
if ((lpOutputStringA = (LPSTR) InternalMalloc((strLen * sizeof(CHAR)))) == NULL)
{
ERROR("Insufficient memory available !\n");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
goto EXIT;
}
if(! WideCharToMultiByte(CP_ACP, 0, lpOutputString, -1,
lpOutputStringA, strLen, NULL, NULL))
{
ASSERT("failed to convert wide chars to multibytes\n");
SetLastError(ERROR_INTERNAL_ERROR);
InternalFree(lpOutputStringA);
goto EXIT;
}
OutputDebugStringA(lpOutputStringA);
InternalFree(lpOutputStringA);
EXIT:
LOGEXIT("OutputDebugStringW returns\n");
PERF_EXIT(OutputDebugStringW);
}
#ifdef ENABLE_RUN_ON_DEBUG_BREAK
/*
When DebugBreak() is called, if PAL_RUN_ON_DEBUG_BREAK is set,
DebugBreak() will execute whatever command is in there.
PAL_RUN_ON_DEBUG_BREAK must be no longer than 255 characters.
This command string inherits the current process's environment,
with two additions:
PAL_EXE_PID - the process ID of the current process
PAL_EXE_NAME - the name of the executable of the current process
When DebugBreak() runs this string, it periodically polls the child process
and blocks until it finishes. If you use this mechanism to start a
debugger, you can break this poll loop by setting the "spin" variable in
run_debug_command()'s frame to 0, and then the parent process can
continue.
suggested values for PAL_RUN_ON_DEBUG_BREAK:
to halt the process for later inspection:
'echo stopping $PAL_EXE_PID; kill -STOP $PAL_EXE_PID; sleep 10'
to print out the stack trace:
'pstack $PAL_EXE_PID'
to invoke the gdb debugger on the process:
'set -x; gdb $PAL_EXE_NAME $PAL_EXE_PID'
to invoke the ddd debugger on the process (requires X11):
'set -x; ddd $PAL_EXE_NAME $PAL_EXE_PID'
*/
static
int
run_debug_command (const char *command)
{
int pid;
Volatile<int> spin = 1;
if (!command) {
return 1;
}
printf("Spawning command: %s\n", command);
pid = fork();
if (pid == -1) {
return -1;
}
if (pid == 0) {
const char *argv[4] = { "sh", "-c", command, 0 };
execv("/bin/sh", (char **)argv);
exit(127);
}
/* We continue either when the spawned process has stopped, or when
an attached debugger sets spin to 0 */
while (spin != 0) {
int status = 0;
int ret = waitpid(pid, &status, WNOHANG);
if (ret == 0) {
int i;
/* I tried to use sleep for this, and that works everywhere except
FreeBSD. The problem on FreeBSD is that if the process gets a
signal while blocked in sleep(), gdb is confused by the stack */
for (i = 0; i < 1000000; i++)
;
}
else if (ret == -1) {
if (errno != EINTR) {
return -1;
}
}
else if (WIFEXITED(status)) {
return WEXITSTATUS(status);
}
else {
fprintf (stderr, "unexpected return from waitpid\n");
return -1;
}
};
return 0;
}
#endif // ENABLE_RUN_ON_DEBUG_BREAK
#define PID_TEXT "PAL_EXE_PID="
#define EXE_TEXT "PAL_EXE_NAME="
static
int
DebugBreakCommand()
{
#ifdef ENABLE_RUN_ON_DEBUG_BREAK
extern MODSTRUCT exe_module;
const char *command_string = getenv (PAL_RUN_ON_DEBUG_BREAK);
if (command_string) {
char pid_buf[sizeof (PID_TEXT) + 32];
PathCharString exe_bufString;
int libNameLength = 10;
if (exe_module.lib_name != NULL)
{
libNameLength = PAL_wcslen(exe_module.lib_name);
}
SIZE_T dwexe_buf = strlen(EXE_TEXT) + libNameLength + 1;
CHAR * exe_buf = exe_bufString.OpenStringBuffer(dwexe_buf);
if (NULL == exe_buf)
{
goto FAILED;
}
if (snprintf (pid_buf, sizeof (pid_buf), PID_TEXT "%d", getpid()) <= 0) {
goto FAILED;
}
if (snprintf (exe_buf, sizeof (CHAR) * (dwexe_buf + 1), EXE_TEXT "%ls", (char16_t *)exe_module.lib_name) <= 0) {
goto FAILED;
}
exe_bufString.CloseBuffer(dwexe_buf);
/* strictly speaking, we might want to only set these environment
variables in the child process, but if we do that we can't check
for errors. putenv/setenv can fail when out of memory */
if (!MiscPutenv (pid_buf, FALSE) || !MiscPutenv (exe_buf, FALSE)) {
goto FAILED;
}
if (run_debug_command (command_string)) {
goto FAILED;
}
return 1;
}
return 0;
FAILED:
fprintf (stderr, "Failed to execute command: '%s'\n", command_string);
return -1;
#else // ENABLE_RUN_ON_DEBUG_BREAK
return 0;
#endif // ENABLE_RUN_ON_DEBUG_BREAK
}
/*++
Function:
DebugBreak
See MSDN doc.
--*/
VOID
PALAPI
DebugBreak(
VOID)
{
PERF_ENTRY(DebugBreak);
ENTRY("DebugBreak()\n");
if (DebugBreakCommand() <= 0) {
// either didn't do anything, or failed
TRACE("Calling DBG_DebugBreak\n");
DBG_DebugBreak();
}
LOGEXIT("DebugBreak returns\n");
PERF_EXIT(DebugBreak);
}
/*++
Function:
IsInDebugBreak(addr)
Returns true if the address is in DBG_DebugBreak.
--*/
BOOL
IsInDebugBreak(void *addr)
{
#ifdef _M_IX86
// TODO: enable this
// When enabled, lldb/ch fails prematurely at initialization phase
return FALSE;
#else
return (addr >= (void *)DBG_DebugBreak) && (addr <= (void *)DBG_DebugBreak_End);
#endif
}
/*++
Function:
GetThreadContext
See MSDN doc.
--*/
BOOL
PALAPI
GetThreadContext(
IN HANDLE hThread,
IN OUT LPCONTEXT lpContext)
{
PAL_ERROR palError;
CPalThread *pThread;
CPalThread *pTargetThread;
IPalObject *pobjThread = NULL;
BOOL ret = FALSE;
PERF_ENTRY(GetThreadContext);
ENTRY("GetThreadContext (hThread=%p, lpContext=%p)\n",hThread,lpContext);
pThread = InternalGetCurrentThread();
palError = InternalGetThreadDataFromHandle(
pThread,
hThread,
0, // THREAD_GET_CONTEXT
&pTargetThread,
&pobjThread
);
if (NO_ERROR == palError)
{
if (!pTargetThread->IsDummy())
{
ret = CONTEXT_GetThreadContext(
GetCurrentProcessId(),
pTargetThread->GetPThreadSelf(),
lpContext
);
}
else
{
ASSERT("Dummy thread handle passed to GetThreadContext\n");
pThread->SetLastError(ERROR_INVALID_HANDLE);
}
}
else
{
pThread->SetLastError(palError);
}
if (NULL != pobjThread)
{
pobjThread->ReleaseReference(pThread);
}
LOGEXIT("GetThreadContext returns ret:%d\n", ret);
PERF_EXIT(GetThreadContext);
return ret;
}
/*++
Function:
SetThreadContext
See MSDN doc.
--*/
BOOL
PALAPI
SetThreadContext(
IN HANDLE hThread,
IN CONST CONTEXT *lpContext)
{
PAL_ERROR palError;
CPalThread *pThread;
CPalThread *pTargetThread;
IPalObject *pobjThread = NULL;
BOOL ret = FALSE;
PERF_ENTRY(SetThreadContext);
ENTRY("SetThreadContext (hThread=%p, lpContext=%p)\n",hThread,lpContext);
pThread = InternalGetCurrentThread();
palError = InternalGetThreadDataFromHandle(
pThread,
hThread,
0, // THREAD_SET_CONTEXT
&pTargetThread,
&pobjThread
);
if (NO_ERROR == palError)
{
if (!pTargetThread->IsDummy())
{
ret = CONTEXT_SetThreadContext(
GetCurrentProcessId(),
pTargetThread->GetPThreadSelf(),
lpContext
);
}
else
{
ASSERT("Dummy thread handle passed to SetThreadContext\n");
pThread->SetLastError(ERROR_INVALID_HANDLE);
}
}
else
{
pThread->SetLastError(palError);
}
if (NULL != pobjThread)
{
pobjThread->ReleaseReference(pThread);
}
return ret;
}
/*++
Function:
ReadProcessMemory
See MSDN doc.
--*/
BOOL
PALAPI
ReadProcessMemory(
IN HANDLE hProcess,
IN LPCVOID lpBaseAddress,
IN LPVOID lpBuffer,
IN SIZE_T nSize,
OUT SIZE_T * lpNumberOfBytesRead
)
{
CPalThread *pThread;
DWORD processId;
Volatile<BOOL> ret = FALSE;
Volatile<SIZE_T> numberOfBytesRead = 0;
#if HAVE_VM_READ
kern_return_t result;
vm_map_t task;
LONG_PTR bytesToRead;
#elif HAVE_PROCFS_CTL
int fd;
char memPath[64];
off_t offset;
#elif !HAVE_TTRACE
SIZE_T nbInts;
int* ptrInt;
int* lpTmpBuffer;
#endif
#if !HAVE_PROCFS_CTL && !HAVE_TTRACE
int* lpBaseAddressAligned;
SIZE_T offset;
#endif // !HAVE_PROCFS_CTL && !HAVE_TTRACE
PERF_ENTRY(ReadProcessMemory);
ENTRY("ReadProcessMemory (hProcess=%p,lpBaseAddress=%p, lpBuffer=%p, "
"nSize=%u, lpNumberOfBytesRead=%p)\n",hProcess,lpBaseAddress,
lpBuffer, (unsigned int)nSize, lpNumberOfBytesRead);
pThread = InternalGetCurrentThread();
if (!(processId = PROCGetProcessIDFromHandle(hProcess)))
{
ERROR("Invalid process handler hProcess:%p.",hProcess);
SetLastError(ERROR_INVALID_HANDLE);
goto EXIT;
}
// Check if the read request is for the current process.
// We don't need ptrace in that case.
if (GetCurrentProcessId() == processId)
{
TRACE("We are in the same process, so ptrace is not needed\n");
struct Param
{
LPCVOID lpBaseAddress;
LPVOID lpBuffer;
SIZE_T nSize;
SIZE_T numberOfBytesRead;
BOOL ret;
} param;
param.lpBaseAddress = lpBaseAddress;
param.lpBuffer = lpBuffer;
param.nSize = nSize;
param.numberOfBytesRead = numberOfBytesRead;
param.ret = ret;
{
SIZE_T i;
// Seg fault in memcpy can't be caught
// so we simulate the memcpy here
for (i = 0; i<param.nSize; i++)
{
*((char*)(param.lpBuffer)+i) = *((char*)(param.lpBaseAddress)+i);
}
param.numberOfBytesRead = param.nSize;
param.ret = TRUE;
}
numberOfBytesRead = param.numberOfBytesRead;
ret = param.ret;
goto EXIT;
}
#if HAVE_VM_READ
result = task_for_pid(mach_task_self(), processId, &task);
if (result != KERN_SUCCESS)
{
ERROR("No Mach task for pid %d: %d\n", processId, ret.Load());
SetLastError(ERROR_INVALID_HANDLE);
goto EXIT;
}
// vm_read_overwrite usually requires that the address be page-aligned
// and the size be a multiple of the page size. We can't differentiate
// between the cases in which that's required and those in which it
// isn't, so we do it all the time.
lpBaseAddressAligned = (int*)((SIZE_T) lpBaseAddress & ~VIRTUAL_PAGE_MASK);
offset = ((SIZE_T) lpBaseAddress & VIRTUAL_PAGE_MASK);
char *data;
data = (char*)alloca(VIRTUAL_PAGE_SIZE);
while (nSize > 0)
{
vm_size_t bytesRead;
bytesToRead = VIRTUAL_PAGE_SIZE - offset;
if (bytesToRead > (LONG_PTR)nSize)
{
bytesToRead = nSize;
}
bytesRead = VIRTUAL_PAGE_SIZE;
result = vm_read_overwrite(task, (vm_address_t) lpBaseAddressAligned,
VIRTUAL_PAGE_SIZE, (vm_address_t) data, &bytesRead);
if (result != KERN_SUCCESS || bytesRead != VIRTUAL_PAGE_SIZE)
{
ERROR("vm_read_overwrite failed for %d bytes from %p in %d: %d\n",
VIRTUAL_PAGE_SIZE, (char *) lpBaseAddressAligned, task, result);
if (result <= KERN_RETURN_MAX)
{
SetLastError(ERROR_INVALID_ACCESS);
}
else
{
SetLastError(ERROR_INTERNAL_ERROR);
}
goto EXIT;
}
memcpy((LPSTR)lpBuffer + numberOfBytesRead, data + offset, bytesToRead);
numberOfBytesRead.Store(numberOfBytesRead.Load() + bytesToRead);
lpBaseAddressAligned = (int*)((char*)lpBaseAddressAligned + VIRTUAL_PAGE_SIZE);
nSize -= bytesToRead;
offset = 0;
}
ret = TRUE;
#else // HAVE_VM_READ
#if HAVE_PROCFS_CTL
snprintf(memPath, sizeof(memPath), "/proc/%u/%s", processId, PROCFS_MEM_NAME);
fd = InternalOpen(memPath, O_RDONLY);
if (fd == -1)
{
ERROR("Failed to open %s\n", memPath);
SetLastError(ERROR_INVALID_ACCESS);
goto PROCFSCLEANUP;
}
//
// off_t may be greater in size than void*, so first cast to
// an unsigned type to ensure that no sign extension takes place
//
offset = (off_t) (UINT_PTR) lpBaseAddress;
if (lseek(fd, offset, SEEK_SET) == -1)
{
ERROR("Failed to seek to base address\n");
SetLastError(ERROR_INVALID_ACCESS);
goto PROCFSCLEANUP;
}
numberOfBytesRead = read(fd, lpBuffer, nSize);
ret = TRUE;
#else // HAVE_PROCFS_CTL
// Attach the process before calling ttrace/ptrace otherwise it fails.
if (DBGAttachProcess(pThread, hProcess, processId))
{
#if HAVE_TTRACE
if (ttrace(TT_PROC_RDDATA, processId, 0, (__uint64_t)lpBaseAddress, (__uint64_t)nSize, (__uint64_t)lpBuffer) == -1)
{
if (errno == EFAULT)
{
ERROR("ttrace(TT_PROC_RDDATA, pid:%d, 0, addr:%p, data:%d, addr2:%d) failed"
" errno=%d (%s)\n", processId, lpBaseAddress, (int)nSize, lpBuffer,
errno, strerror(errno));
SetLastError(ERROR_ACCESS_DENIED);
}
else
{
ASSERT("ttrace(TT_PROC_RDDATA, pid:%d, 0, addr:%p, data:%d, addr2:%d) failed"
" errno=%d (%s)\n", processId, lpBaseAddress, (int)nSize, lpBuffer,
errno, strerror(errno));
SetLastError(ERROR_INTERNAL_ERROR);
}
goto CLEANUP1;
}
numberOfBytesRead = nSize;
ret = TRUE;
#else // HAVE_TTRACE
offset = (SIZE_T)lpBaseAddress % sizeof(int);
lpBaseAddressAligned = (int*)((char*)lpBaseAddress - offset);
nbInts = (nSize + offset)/sizeof(int) +
((nSize + offset)%sizeof(int) ? 1:0);
/* before transferring any data to lpBuffer we should make sure that all
data is accessible for read. so we need to use a temp buffer for that.*/
if (!(lpTmpBuffer = (int*)InternalMalloc((nbInts * sizeof(int)))))
{
ERROR("Insufficient memory available !\n");
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
goto CLEANUP1;
}
for (ptrInt = lpTmpBuffer; nbInts; ptrInt++,
lpBaseAddressAligned++, nbInts--)
{
errno = 0;
*ptrInt =
PAL_PTRACE(PAL_PT_READ_D, processId, lpBaseAddressAligned, 0);
if (*ptrInt == -1 && errno)
{
if (errno == EFAULT)
{
ERROR("ptrace(PT_READ_D, pid:%d, addr:%p, data:0) failed"
" errno=%d (%s)\n", processId, lpBaseAddressAligned,
errno, strerror(errno));
SetLastError(ptrInt == lpTmpBuffer ? ERROR_ACCESS_DENIED :
ERROR_PARTIAL_COPY);
}
else
{
ASSERT("ptrace(PT_READ_D, pid:%d, addr:%p, data:0) failed"
" errno=%d (%s)\n", processId, lpBaseAddressAligned,
errno, strerror(errno));
SetLastError(ERROR_INTERNAL_ERROR);
}
goto CLEANUP2;
}
}
/* transfer data from temp buffer to lpBuffer */
memcpy( (char *)lpBuffer, ((char*)lpTmpBuffer) + offset, nSize);
numberOfBytesRead = nSize;
ret = TRUE;
#endif // HAVE_TTRACE
}
else
{
/* Failed to attach processId */
goto EXIT;
}
#endif // HAVE_PROCFS_CTL
#if HAVE_PROCFS_CTL
PROCFSCLEANUP:
if (fd != -1)
{
close(fd);
}
#elif !HAVE_TTRACE
CLEANUP2:
if (lpTmpBuffer)
{
InternalFree(lpTmpBuffer);
}
#endif // !HAVE_TTRACE
#if !HAVE_PROCFS_CTL
CLEANUP1:
if (!DBGDetachProcess(pThread, hProcess, processId))
{
/* Failed to detach processId */
ret = FALSE;
}
#endif // HAVE_PROCFS_CTL
#endif // HAVE_VM_READ
EXIT:
if (lpNumberOfBytesRead)
{
*lpNumberOfBytesRead = numberOfBytesRead;
}
LOGEXIT("ReadProcessMemory returns BOOL %d\n", ret.Load());
PERF_EXIT(ReadProcessMemory);
return ret;
}
/*++
Function:
WriteProcessMemory
See MSDN doc.
--*/
BOOL
PALAPI
WriteProcessMemory(
IN HANDLE hProcess,
IN LPVOID lpBaseAddress,
IN LPCVOID lpBuffer,
IN SIZE_T nSize,
OUT SIZE_T * lpNumberOfBytesWritten
)
{
CPalThread *pThread;
DWORD processId;
Volatile<BOOL> ret = FALSE;
Volatile<SIZE_T> numberOfBytesWritten = 0;
#if HAVE_VM_READ
kern_return_t result;
vm_map_t task;
#elif HAVE_PROCFS_CTL
int fd;
char memPath[64];
LONG_PTR bytesWritten;
off_t offset;
#elif !HAVE_TTRACE
SIZE_T FirstIntOffset;
SIZE_T LastIntOffset;
unsigned int FirstIntMask;
unsigned int LastIntMask;
SIZE_T nbInts;
int *lpTmpBuffer = 0, *lpInt;
int* lpBaseAddressAligned;
#endif
PERF_ENTRY(WriteProcessMemory);
ENTRY("WriteProcessMemory (hProcess=%p,lpBaseAddress=%p, lpBuffer=%p, "
"nSize=%u, lpNumberOfBytesWritten=%p)\n",
hProcess,lpBaseAddress, lpBuffer, (unsigned int)nSize, lpNumberOfBytesWritten);
pThread = InternalGetCurrentThread();
if (!(nSize && (processId = PROCGetProcessIDFromHandle(hProcess))))
{
ERROR("Invalid nSize:%u number or invalid process handler "
"hProcess:%p\n", (unsigned int)nSize, hProcess);
SetLastError(ERROR_INVALID_PARAMETER);
goto EXIT;
}
// Check if the write request is for the current process.
// In that case we don't need ptrace.
if (GetCurrentProcessId() == processId)
{
TRACE("We are in the same process so we don't need ptrace\n");
struct Param
{
LPVOID lpBaseAddress;
LPCVOID lpBuffer;
SIZE_T nSize;
SIZE_T numberOfBytesWritten;
BOOL ret;
} param;
param.lpBaseAddress = lpBaseAddress;
param.lpBuffer = lpBuffer;
param.nSize = nSize;
param.numberOfBytesWritten = numberOfBytesWritten;
param.ret = ret;
{
SIZE_T i;
// Seg fault in memcpy can't be caught
// so we simulate the memcpy here
for (i = 0; i<param.nSize; i++)
{
*((char*)(param.lpBaseAddress)+i) = *((char*)(param.lpBuffer)+i);
}
param.numberOfBytesWritten = param.nSize;
param.ret = TRUE;
}
numberOfBytesWritten = param.numberOfBytesWritten;
ret = param.ret;
goto EXIT;
}
#if HAVE_VM_READ
result = task_for_pid(mach_task_self(), processId, &task);
if (result != KERN_SUCCESS)
{
ERROR("No Mach task for pid %d: %d\n", processId, ret.Load());
SetLastError(ERROR_INVALID_HANDLE);
goto EXIT;
}
result = vm_write(task, (vm_address_t) lpBaseAddress,
(vm_address_t) lpBuffer, nSize);
if (result != KERN_SUCCESS)
{
ERROR("vm_write failed for %d bytes from %p in %d: %d\n",
(int)nSize, lpBaseAddress, task, result);
if (result <= KERN_RETURN_MAX)
{
SetLastError(ERROR_ACCESS_DENIED);
}
else
{
SetLastError(ERROR_INTERNAL_ERROR);
}
goto EXIT;
}
numberOfBytesWritten = nSize;
ret = TRUE;
#else // HAVE_VM_READ
#if HAVE_PROCFS_CTL
snprintf(memPath, sizeof(memPath), "/proc/%u/%s", processId, PROCFS_MEM_NAME);
fd = InternalOpen(memPath, O_WRONLY);
if (fd == -1)
{
ERROR("Failed to open %s\n", memPath);
SetLastError(ERROR_INVALID_ACCESS);
goto PROCFSCLEANUP;
}
//
// off_t may be greater in size than void*, so first cast to
// an unsigned type to ensure that no sign extension takes place
//
offset = (off_t) (UINT_PTR) lpBaseAddress;
if (lseek(fd, offset, SEEK_SET) == -1)
{
ERROR("Failed to seek to base address\n");
SetLastError(ERROR_INVALID_ACCESS);
goto PROCFSCLEANUP;
}
bytesWritten = write(fd, lpBuffer, nSize);
if (bytesWritten < 0)
{
ERROR("Failed to write to %s\n", memPath);
SetLastError(ERROR_INVALID_ACCESS);
goto PROCFSCLEANUP;
}
numberOfBytesWritten = bytesWritten;
ret = TRUE;