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dbghelp: Don't write minidump from running thread.

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In case a minidump is written from current process, create
a dedicated thread to write the minidump (and hide that thread
from the minidump).

Signed-off-by: Eric Pouech <epouech@codeweavers.com>
This commit is contained in:
Eric Pouech 2024-03-11 16:04:05 +01:00 committed by Alexandre Julliard
parent 56193155a0
commit f799bf025b
3 changed files with 170 additions and 142 deletions
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4
dlls/dbghelp/dbghelp_private.h
View file

@ -618,7 +618,9 @@ struct dump_context
struct dump_module* modules;
unsigned num_modules;
unsigned alloc_modules;
/* exception information */
/* outter information */
MINIDUMP_EXCEPTION_INFORMATION *except_param;
MINIDUMP_USER_STREAM_INFORMATION *user_stream;
/* output information */
MINIDUMP_TYPE type;
HANDLE hFile;

300
dlls/dbghelp/minidump.c
View file

@ -61,15 +61,19 @@ static BOOL fetch_process_info(struct dump_context* dc)
{
if (HandleToUlong(spi->UniqueProcessId) == dc->pid)
{
dc->num_threads = spi->dwThreadCount;
dc->num_threads = 0;
dc->threads = HeapAlloc(GetProcessHeap(), 0,
dc->num_threads * sizeof(dc->threads[0]));
if (!dc->threads) goto failed;
for (i = 0; i < dc->num_threads; i++)
spi->dwThreadCount * sizeof(dc->threads[0]));
if (!dc->threads) break;
for (i = 0; i < spi->dwThreadCount; i++)
{
dc->threads[i].tid = HandleToULong(spi->ti[i].ClientId.UniqueThread);
dc->threads[i].prio_class = spi->ti[i].dwBasePriority; /* FIXME */
dc->threads[i].curr_prio = spi->ti[i].dwCurrentPriority;
/* don't include current thread */
if (HandleToULong(spi->ti[i].ClientId.UniqueThread) == GetCurrentThreadId())
continue;
dc->threads[dc->num_threads].tid = HandleToULong(spi->ti[i].ClientId.UniqueThread);
dc->threads[dc->num_threads].prio_class = spi->ti[i].dwBasePriority; /* FIXME */
dc->threads[dc->num_threads].curr_prio = spi->ti[i].dwCurrentPriority;
dc->num_threads++;
}
HeapFree(GetProcessHeap(), 0, pcs_buffer);
return TRUE;
@ -78,7 +82,6 @@ static BOOL fetch_process_info(struct dump_context* dc)
spi = (SYSTEM_PROCESS_INFORMATION*)((char*)spi + spi->NextEntryOffset);
}
}
failed:
HeapFree(GetProcessHeap(), 0, pcs_buffer);
return FALSE;
}
@ -397,22 +400,21 @@ static void append(struct dump_context* dc, const void* data, unsigned size)
*
* Write in File the exception information from pcs
*/
static unsigned dump_exception_info(struct dump_context* dc,
const MINIDUMP_EXCEPTION_INFORMATION* except)
static unsigned dump_exception_info(struct dump_context* dc)
{
MINIDUMP_EXCEPTION_STREAM mdExcpt;
EXCEPTION_RECORD rec, *prec;
CONTEXT ctx, *pctx;
DWORD i;
mdExcpt.ThreadId = except->ThreadId;
mdExcpt.ThreadId = dc->except_param->ThreadId;
mdExcpt.__alignment = 0;
if (except->ClientPointers)
if (dc->except_param->ClientPointers)
{
EXCEPTION_POINTERS ep;
ReadProcessMemory(dc->process->handle,
except->ExceptionPointers, &ep, sizeof(ep), NULL);
dc->except_param->ExceptionPointers, &ep, sizeof(ep), NULL);
ReadProcessMemory(dc->process->handle,
ep.ExceptionRecord, &rec, sizeof(rec), NULL);
ReadProcessMemory(dc->process->handle,
@ -422,8 +424,8 @@ static unsigned dump_exception_info(struct dump_context* dc,
}
else
{
prec = except->ExceptionPointers->ExceptionRecord;
pctx = except->ExceptionPointers->ContextRecord;
prec = dc->except_param->ExceptionPointers->ExceptionRecord;
pctx = dc->except_param->ExceptionPointers->ContextRecord;
}
mdExcpt.ExceptionRecord.ExceptionCode = prec->ExceptionCode;
mdExcpt.ExceptionRecord.ExceptionFlags = prec->ExceptionFlags;
@ -715,8 +717,7 @@ static unsigned dump_system_info(struct dump_context* dc)
*
* Dumps into File the information about running threads
*/
static unsigned dump_threads(struct dump_context* dc,
const MINIDUMP_EXCEPTION_INFORMATION* except)
static unsigned dump_threads(struct dump_context* dc)
{
MINIDUMP_THREAD mdThd;
MINIDUMP_THREAD_LIST mdThdList;
@ -732,7 +733,7 @@ static unsigned dump_threads(struct dump_context* dc,
for (i = 0; i < dc->num_threads; i++)
{
fetch_thread_info(dc, i, except, &mdThd, &ctx);
fetch_thread_info(dc, i, dc->except_param, &mdThd, &ctx);
flags_out = ThreadWriteThread | ThreadWriteStack | ThreadWriteContext |
ThreadWriteInstructionWindow;
@ -906,6 +907,126 @@ static unsigned dump_misc_info(struct dump_context* dc)
return sizeof(mmi);
}
static DWORD CALLBACK write_minidump(void *_args)
{
struct dump_context *dc = _args;
static const MINIDUMP_DIRECTORY emptyDir = {UnusedStream, {0, 0}};
MINIDUMP_HEADER mdHead;
MINIDUMP_DIRECTORY mdDir;
DWORD i, nStreams, idx_stream;
if (!fetch_process_info(dc)) return FALSE;
fetch_modules_info(dc);
/* 1) init */
nStreams = 6 + (dc->except_param ? 1 : 0) +
(dc->user_stream ? dc->user_stream->UserStreamCount : 0);
/* pad the directory size to a multiple of 4 for alignment purposes */
nStreams = (nStreams + 3) & ~3;
/* 2) write header */
mdHead.Signature = MINIDUMP_SIGNATURE;
mdHead.Version = MINIDUMP_VERSION; /* NOTE: native puts in an 'implementation specific' value in the high order word of this member */
mdHead.NumberOfStreams = nStreams;
mdHead.CheckSum = 0; /* native sets a 0 checksum in its files */
mdHead.StreamDirectoryRva = sizeof(mdHead);
mdHead.TimeDateStamp = time(NULL);
mdHead.Flags = dc->type;
append(dc, &mdHead, sizeof(mdHead));
/* 3) write stream directories */
dc->rva += nStreams * sizeof(mdDir);
idx_stream = 0;
/* 3.1) write data stream directories */
/* must be first in minidump */
mdDir.StreamType = SystemInfoStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_system_info(dc);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
mdDir.StreamType = ThreadListStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_threads(dc);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
mdDir.StreamType = ModuleListStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_modules(dc, FALSE);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
mdDir.StreamType = 0xfff0; /* FIXME: this is part of MS reserved streams */
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_modules(dc, TRUE);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
if (!(dc->type & MiniDumpWithFullMemory))
{
mdDir.StreamType = MemoryListStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_memory_info(dc);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
}
mdDir.StreamType = MiscInfoStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_misc_info(dc);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
/* 3.2) write exception information (if any) */
if (dc->except_param)
{
mdDir.StreamType = ExceptionStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_exception_info(dc);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
}
/* 3.3) write user defined streams (if any) */
if (dc->user_stream)
{
for (i = 0; i < dc->user_stream->UserStreamCount; i++)
{
mdDir.StreamType = dc->user_stream->UserStreamArray[i].Type;
mdDir.Location.DataSize = dc->user_stream->UserStreamArray[i].BufferSize;
mdDir.Location.Rva = dc->rva;
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
append(dc, dc->user_stream->UserStreamArray[i].Buffer,
dc->user_stream->UserStreamArray[i].BufferSize);
}
}
/* 3.4) write full memory (if requested) */
if (dc->type & MiniDumpWithFullMemory)
{
fetch_memory64_info(dc);
mdDir.StreamType = Memory64ListStream;
mdDir.Location.Rva = dc->rva;
mdDir.Location.DataSize = dump_memory64_info(dc);
writeat(dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
}
/* fill the remaining directory entries with 0's (unused stream types) */
/* NOTE: this should always come last in the dump! */
for (i = idx_stream; i < nStreams; i++)
writeat(dc, mdHead.StreamDirectoryRva + i * sizeof(emptyDir), &emptyDir, sizeof(emptyDir));
return TRUE;
}
/******************************************************************
* MiniDumpWriteDump (DEBUGHLP.@)
*
@ -916,12 +1037,9 @@ BOOL WINAPI MiniDumpWriteDump(HANDLE hProcess, DWORD pid, HANDLE hFile,
PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
PMINIDUMP_CALLBACK_INFORMATION CallbackParam)
{
static const MINIDUMP_DIRECTORY emptyDir = {UnusedStream, {0, 0}};
MINIDUMP_HEADER mdHead;
MINIDUMP_DIRECTORY mdDir;
DWORD i, nStreams, idx_stream;
struct dump_context dc;
BOOL sym_initialized = FALSE;
BOOL ret = FALSE;
if (!(dc.process = process_find_by_handle(hProcess)))
{
@ -933,6 +1051,15 @@ BOOL WINAPI MiniDumpWriteDump(HANDLE hProcess, DWORD pid, HANDLE hFile,
dc.process = process_find_by_handle(hProcess);
}
if (DumpType & MiniDumpWithDataSegs)
FIXME("NIY MiniDumpWithDataSegs\n");
if (DumpType & MiniDumpWithHandleData)
FIXME("NIY MiniDumpWithHandleData\n");
if (DumpType & MiniDumpFilterMemory)
FIXME("NIY MiniDumpFilterMemory\n");
if (DumpType & MiniDumpScanMemory)
FIXME("NIY MiniDumpScanMemory\n");
dc.hFile = hFile;
dc.pid = pid;
dc.modules = NULL;
@ -949,125 +1076,26 @@ BOOL WINAPI MiniDumpWriteDump(HANDLE hProcess, DWORD pid, HANDLE hFile,
dc.num_mem64 = 0;
dc.alloc_mem64 = 0;
dc.rva = 0;
dc.except_param = ExceptionParam;
dc.user_stream = UserStreamParam;
if (!fetch_process_info(&dc)) return FALSE;
fetch_modules_info(&dc);
/* 1) init */
nStreams = 6 + (ExceptionParam ? 1 : 0) +
(UserStreamParam ? UserStreamParam->UserStreamCount : 0);
/* pad the directory size to a multiple of 4 for alignment purposes */
nStreams = (nStreams + 3) & ~3;
if (DumpType & MiniDumpWithDataSegs)
FIXME("NIY MiniDumpWithDataSegs\n");
if (DumpType & MiniDumpWithHandleData)
FIXME("NIY MiniDumpWithHandleData\n");
if (DumpType & MiniDumpFilterMemory)
FIXME("NIY MiniDumpFilterMemory\n");
if (DumpType & MiniDumpScanMemory)
FIXME("NIY MiniDumpScanMemory\n");
/* 2) write header */
mdHead.Signature = MINIDUMP_SIGNATURE;
mdHead.Version = MINIDUMP_VERSION; /* NOTE: native puts in an 'implementation specific' value in the high order word of this member */
mdHead.NumberOfStreams = nStreams;
mdHead.CheckSum = 0; /* native sets a 0 checksum in its files */
mdHead.StreamDirectoryRva = sizeof(mdHead);
mdHead.TimeDateStamp = time(NULL);
mdHead.Flags = DumpType;
append(&dc, &mdHead, sizeof(mdHead));
/* 3) write stream directories */
dc.rva += nStreams * sizeof(mdDir);
idx_stream = 0;
/* 3.1) write data stream directories */
/* must be first in minidump */
mdDir.StreamType = SystemInfoStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_system_info(&dc);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
mdDir.StreamType = ThreadListStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_threads(&dc, ExceptionParam);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
mdDir.StreamType = ModuleListStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_modules(&dc, FALSE);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
mdDir.StreamType = 0xfff0; /* FIXME: this is part of MS reserved streams */
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_modules(&dc, TRUE);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
if (!(DumpType & MiniDumpWithFullMemory))
/* have a dedicated thread for fetching info on self */
if (dc.pid != GetCurrentProcessId())
ret = write_minidump(&dc);
else
{
mdDir.StreamType = MemoryListStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_memory_info(&dc);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
}
mdDir.StreamType = MiscInfoStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_misc_info(&dc);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
/* 3.2) write exception information (if any) */
if (ExceptionParam)
{
mdDir.StreamType = ExceptionStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_exception_info(&dc, ExceptionParam);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
}
/* 3.3) write user defined streams (if any) */
if (UserStreamParam)
{
for (i = 0; i < UserStreamParam->UserStreamCount; i++)
DWORD exit_code;
HANDLE h = CreateThread(NULL, 0, write_minidump, &dc, 0, NULL);
if (h)
{
mdDir.StreamType = UserStreamParam->UserStreamArray[i].Type;
mdDir.Location.DataSize = UserStreamParam->UserStreamArray[i].BufferSize;
mdDir.Location.Rva = dc.rva;
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
append(&dc, UserStreamParam->UserStreamArray[i].Buffer,
UserStreamParam->UserStreamArray[i].BufferSize);
if (WaitForSingleObject(h, INFINITE) == WAIT_OBJECT_0 && GetExitCodeThread(h, &exit_code))
ret = exit_code;
else
TerminateThread(h, 0);
CloseHandle(h);
}
}
/* 3.4) write full memory (if requested) */
if (DumpType & MiniDumpWithFullMemory)
{
fetch_memory64_info(&dc);
mdDir.StreamType = Memory64ListStream;
mdDir.Location.Rva = dc.rva;
mdDir.Location.DataSize = dump_memory64_info(&dc);
writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
&mdDir, sizeof(mdDir));
}
/* fill the remaining directory entries with 0's (unused stream types) */
/* NOTE: this should always come last in the dump! */
for (i = idx_stream; i < nStreams; i++)
writeat(&dc, mdHead.StreamDirectoryRva + i * sizeof(emptyDir), &emptyDir, sizeof(emptyDir));
if (sym_initialized)
SymCleanup(hProcess);
@ -1076,7 +1104,7 @@ BOOL WINAPI MiniDumpWriteDump(HANDLE hProcess, DWORD pid, HANDLE hFile,
HeapFree(GetProcessHeap(), 0, dc.modules);
HeapFree(GetProcessHeap(), 0, dc.threads);
return TRUE;
return ret;
}
/******************************************************************

8
dlls/dbghelp/tests/minidump.c
View file

@ -463,13 +463,11 @@ static void test_current_process(void)
num_threads = minidump_get_number_of_threads(data);
ok(num_threads > 0, "Unexpected number of threads\n");
minidump_check_threads(data, 11);
minidump_check_threads(data, 2);
md = minidump_get_memory_description(data, (DWORD_PTR)&i);
todo_wine
ok(md.kind == MD_STACK, "Couldn't find automatic variable\n");
md2 = minidump_get_memory_description(data, (DWORD_PTR)NtCurrentTeb()->Tib.StackBase - sizeof(void*));
todo_wine
ok(md2.kind == MD_STACK, "Couldn't find stack bottom\n");
ok(md.id == md2.id, "Should be on same stack\n");
@ -486,7 +484,6 @@ static void test_current_process(void)
minidump_walk_memory(data, &walker);
ok(walker.num_unknown == 0, "unexpected unknown memory locations\n");
todo_wine
ok(walker.num_thread_stack == num_threads, "Unexpected number of stacks\n");
if (sizeof(void*) > 4 && (process_tests[i].dump_type & MiniDumpWithModuleHeaders))
@ -810,8 +807,9 @@ static void test_exception(void)
ok(except_info->ThreadContext.Rva, "Unexpected value\n");
mctx = RVA_TO_ADDR(data, except_info->ThreadContext.Rva);
ok(!memcmp(mctx, &ctx, sizeof(ctx)), "Unexpected value\n");
minidump_check_threads(data, exception_tests[i].with_child ? 2 : (sizeof(void*) == 4 ? 7 : 6));
minidump_check_threads(data, 2);
minidump_close_for_read(data);
DeleteFileA("foo.mdmp");
winetest_pop_context();
if (exception_tests[i].with_child)
{