285 lines
7.3 KiB
C++
285 lines
7.3 KiB
C++
/* cygtls.cc
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Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
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2012 Red Hat, Inc.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#define USE_SYS_TYPES_FD_SET
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#include "cygtls.h"
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#include <syslog.h>
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#include <stdlib.h>
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "sigproc.h"
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#include "exception.h"
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class sentry
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{
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static muto lock;
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int destroy;
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public:
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void init ();
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bool acquired () {return lock.acquired ();}
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sentry () {destroy = 0;}
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sentry (DWORD wait) {destroy = lock.acquire (wait);}
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~sentry () {if (destroy) lock.release ();}
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friend void _cygtls::init ();
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};
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muto NO_COPY sentry::lock;
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static size_t NO_COPY nthreads;
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#define THREADLIST_CHUNK 256
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void
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_cygtls::init ()
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{
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if (cygheap->threadlist)
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memset (cygheap->threadlist, 0, cygheap->sthreads * sizeof (cygheap->threadlist[0]));
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else
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{
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cygheap->sthreads = THREADLIST_CHUNK;
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cygheap->threadlist = (_cygtls **) ccalloc_abort (HEAP_TLS, cygheap->sthreads,
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sizeof (cygheap->threadlist[0]));
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}
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sentry::lock.init ("sentry_lock");
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}
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/* Two calls to get the stack right... */
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void
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_cygtls::call (DWORD (*func) (void *, void *), void *arg)
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{
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char buf[CYGTLS_PADSIZE];
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/* Initialize this thread's ability to respond to things like
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SIGSEGV or SIGFPE. */
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exception protect;
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_my_tls.call2 (func, arg, buf);
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}
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static int
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dll_cmp (const void *a, const void *b)
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{
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return wcscasecmp ((const wchar_t *) a, *(const wchar_t **) b);
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}
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/* Keep sorted!
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This is a list of well-known core system DLLs which contain code
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whiuch is started in its own thread by the system. Kernel32.dll,
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for instance, contains the thread called on every Ctrl-C keypress
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in a console window. The DLLs in this list are not recognized as
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BLODAs. */
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const wchar_t *well_known_dlls[] =
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{
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L"advapi32.dll",
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L"kernel32.dll",
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L"mswsock.dll",
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L"ntdll.dll",
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L"shlwapi.dll",
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L"ws2_32.dll",
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};
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void
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_cygtls::call2 (DWORD (*func) (void *, void *), void *arg, void *buf)
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{
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init_thread (buf, func);
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/* Optional BLODA detection. The idea is that the function address is
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supposed to be within Cygwin itself. This is also true for pthreads,
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since pthreads are always calling thread_wrapper in miscfuncs.cc.
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Therefore, every function call to a function outside of the Cygwin DLL
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is potentially a thread injected into the Cygwin process by some BLODA.
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But that's a bit too simple. Assuming the application itself calls
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CreateThread, then this is a bad idea, but not really invalid. So we
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shouldn't print a BLODA message if the address is within the loaded
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image of the application. Also, ntdll.dll starts threads into the
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application which */
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if (detect_bloda)
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{
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PIMAGE_DOS_HEADER img_start = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
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PIMAGE_NT_HEADERS32 ntheader = (PIMAGE_NT_HEADERS32)
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((PBYTE) img_start + img_start->e_lfanew);
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void *img_end = (void *) ((PBYTE) img_start
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+ ntheader->OptionalHeader.SizeOfImage);
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if (((void *) func < (void *) cygwin_hmodule
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|| (void *) func > (void *) cygheap)
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&& ((void *) func < (void *) img_start || (void *) func >= img_end))
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{
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MEMORY_BASIC_INFORMATION mbi;
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wchar_t modname[PATH_MAX];
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VirtualQuery ((PVOID) func, &mbi, sizeof mbi);
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GetModuleFileNameW ((HMODULE) mbi.AllocationBase, modname, PATH_MAX);
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/* Fetch basename and check against list of above system DLLs. */
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const wchar_t *modbasename = wcsrchr (modname, L'\\') + 1;
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if (!bsearch (modbasename, well_known_dlls,
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sizeof well_known_dlls / sizeof well_known_dlls[0],
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sizeof well_known_dlls[0], dll_cmp))
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small_printf ("\n\nPotential BLODA detected! Thread function "
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"called outside of Cygwin DLL:\n %W\n\n", modname);
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}
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}
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DWORD res = func (arg, buf);
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remove (INFINITE);
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/* Don't call ExitThread on the main thread since we may have been
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dynamically loaded. */
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if ((void *) func != (void *) dll_crt0_1
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&& (void *) func != (void *) dll_dllcrt0_1)
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ExitThread (res);
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}
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void
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_cygtls::init_thread (void *x, DWORD (*func) (void *, void *))
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{
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if (x)
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{
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memset (this, 0, sizeof (*this));
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_REENT_INIT_PTR (&local_clib);
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stackptr = stack;
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if (_GLOBAL_REENT)
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{
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local_clib._stdin = _GLOBAL_REENT->_stdin;
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local_clib._stdout = _GLOBAL_REENT->_stdout;
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local_clib._stderr = _GLOBAL_REENT->_stderr;
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local_clib.__sdidinit = _GLOBAL_REENT->__sdidinit ? -1 : 0;
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local_clib.__cleanup = _GLOBAL_REENT->__cleanup;
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local_clib.__sglue._niobs = 3;
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local_clib.__sglue._iobs = &_GLOBAL_REENT->__sf[0];
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}
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}
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thread_id = GetCurrentThreadId ();
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initialized = CYGTLS_INITIALIZED;
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errno_addr = &(local_clib._errno);
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locals.cw_timer = NULL;
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if ((void *) func == (void *) cygthread::stub
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|| (void *) func == (void *) cygthread::simplestub)
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return;
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cygheap->user.reimpersonate ();
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sentry here (INFINITE);
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if (nthreads >= cygheap->sthreads)
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{
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cygheap->threadlist = (_cygtls **)
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crealloc_abort (cygheap->threadlist, (cygheap->sthreads += THREADLIST_CHUNK)
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* sizeof (cygheap->threadlist[0]));
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memset (cygheap->threadlist + nthreads, 0, THREADLIST_CHUNK * sizeof (cygheap->threadlist[0]));
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}
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cygheap->threadlist[nthreads++] = this;
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}
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void
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_cygtls::fixup_after_fork ()
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{
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if (sig)
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{
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pop ();
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sig = 0;
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}
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stacklock = spinning = 0;
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locals.select.sockevt = NULL;
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locals.cw_timer = NULL;
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wq.thread_ev = NULL;
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}
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#define free_local(x) \
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if (locals.x) \
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{ \
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free (locals.x); \
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locals.x = NULL; \
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}
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void
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_cygtls::remove (DWORD wait)
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{
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initialized = 0;
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if (exit_state >= ES_FINAL)
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return;
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debug_printf ("wait %p", wait);
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/* FIXME: Need some sort of atthreadexit function to allow things like
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select to control this themselves. */
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/* Close handle and free memory used by select. */
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if (locals.select.sockevt)
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{
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CloseHandle (locals.select.sockevt);
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locals.select.sockevt = NULL;
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free_local (select.ser_num);
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free_local (select.w4);
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}
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/* Free memory used by network functions. */
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free_local (ntoa_buf);
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free_local (protoent_buf);
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free_local (servent_buf);
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free_local (hostent_buf);
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/* Free temporary TLS path buffers. */
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locals.pathbufs.destroy ();
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do
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{
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sentry here (wait);
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if (here.acquired ())
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{
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for (size_t i = 0; i < nthreads; i++)
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if (this == cygheap->threadlist[i])
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{
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if (i < --nthreads)
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cygheap->threadlist[i] = cygheap->threadlist[nthreads];
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debug_printf ("removed %p element %d", this, i);
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break;
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}
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}
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} while (0);
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remove_wq (wait);
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}
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void
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_cygtls::push (__stack_t addr)
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{
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*stackptr++ = (__stack_t) addr;
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}
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_cygtls *
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_cygtls::find_tls (int sig)
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{
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static int NO_COPY threadlist_ix;
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debug_printf ("signal %d\n", sig);
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sentry here (INFINITE);
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_cygtls *res = NULL;
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threadlist_ix = -1;
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myfault efault;
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if (efault.faulted ())
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cygheap->threadlist[threadlist_ix]->remove (INFINITE);
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while (++threadlist_ix < (int) nthreads)
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if (sigismember (&(cygheap->threadlist[threadlist_ix]->sigwait_mask), sig))
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{
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res = cygheap->threadlist[threadlist_ix];
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break;
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}
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return res;
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}
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void
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_cygtls::set_siginfo (sigpacket *pack)
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{
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infodata = pack->si;
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}
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