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* dlfcn.cc (dlopen): Disable old 32 bit code on 64 bit. 

* dcrt0.cc (check_sanity_and_sync): Ditto.
	* dll_init.cc (dll_dllcrt0_1): Fix typo in comment.
This commit is contained in:
Corinna Vinschen 2014-10-10 15:29:18 +00:00
parent 7a84e9c4bc
commit 3ab591cf71
4 changed files with 13 additions and 1 deletions
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6
winsup/cygwin/ChangeLog
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@ -1,3 +1,9 @@
2014-10-10 Corinna Vinschen <corinna@vinschen.de>
* dlfcn.cc (dlopen): Disable old 32 bit code on 64 bit.
* dcrt0.cc (check_sanity_and_sync): Ditto.
* dll_init.cc (dll_dllcrt0_1): Fix typo in comment.
2014-10-09 Corinna Vinschen <corinna@vinschen.de>
* fhandler_procsys.cc (fhandler_procsys::readdir): Just test

2
winsup/cygwin/dcrt0.cc
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@ -393,11 +393,13 @@ check_sanity_and_sync (per_process *p)
api_fatal ("cygwin DLL and APP are out of sync -- API version mismatch %u > %u",
p->api_major, cygwin_version.api_major);
#ifndef __x86_64__
/* This is a kludge to work around a version of _cygwin_common_crt0
which overwrote the cxx_malloc field with the local DLL copy.
Hilarity ensues if the DLL is not loaded while the process
is forking. */
__cygwin_user_data.cxx_malloc = &default_cygwin_cxx_malloc;
#endif
}
child_info NO_COPY *child_proc_info;

4
winsup/cygwin/dlfcn.cc
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@ -135,6 +135,7 @@ dlopen (const char *name, int flags)
if (last_bs && !wcschr (last_bs, L'.'))
wcscat (last_bs, L".");
#ifndef __x86_64__
/* Workaround for broken DLLs built against Cygwin versions 1.7.0-49
up to 1.7.0-57. They override the cxx_malloc pointer in their
DLL initialization code even if loaded dynamically. This is a
@ -150,6 +151,7 @@ dlopen (const char *name, int flags)
/* Store original cxx_malloc pointer. */
struct per_process_cxx_malloc *tmp_malloc;
tmp_malloc = __cygwin_user_data.cxx_malloc;
#endif
if (!(flags & RTLD_NOLOAD)
|| (ret = GetModuleHandleW (path)) != NULL)
@ -160,8 +162,10 @@ dlopen (const char *name, int flags)
(HMODULE *) &ret);
}
#ifndef __x86_64__
/* Restore original cxx_malloc pointer. */
__cygwin_user_data.cxx_malloc = tmp_malloc;
#endif
if (!ret)
__seterrno ();

2
winsup/cygwin/dll_init.cc
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@ -640,7 +640,7 @@ dll_dllcrt0_1 (VOID *x)
when loaded either statically or dynamically. Because this leaves
a stale pointer into demapped memory space if the DLL is unloaded
by a call to dlclose, we prevent this happening for dynamically
loaded DLLS in dlopen by saving and restoring cxx_malloc around
loaded DLLs in dlopen by saving and restoring cxx_malloc around
the call to LoadLibrary, which invokes the DLL's startup sequence.
Modern DLLs won't even attempt to override the pointer when loaded
statically, but will write their overrides directly into the