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cygwin: Fix crashes under AllocationPreference=0x100000 condition

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* cygtls.h: Include cygtls_padsize.h and define CYGTLS_PADSIZE there.
        * cygtls_padsize.h: New file.  Define CYGTLS_PADSIZE.
        * environ.cc (parse_options): Fix NULL pointer access.
        * init.cc (threadfunc_fe): Do not force stack align on x86_64.

        * strace.cc (main2): Rename from main.
        (main): Make room for _cygtls area on stack and just call main2.  Add
        comment to explain why.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2015-07-29 13:32:29 +02:00
parent 9753bc3333
commit 6ab56bdd3f
8 changed files with 55 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,10 @@
2015-07-29 Corinna Vinschen <corinna@vinschen.de>
* cygtls.h: Include cygtls_padsize.h and define CYGTLS_PADSIZE there.
* cygtls_padsize.h: New file. Define CYGTLS_PADSIZE.
* environ.cc (parse_options): Fix NULL pointer access.
* init.cc (threadfunc_fe): Do not force stack align on x86_64.
2015-07-23 Corinna Vinschen <corinna@vinschen.de>
* exceptions.cc (__cont_link_context): x86_64: align stack and reserve

7
winsup/cygwin/cygtls.h
View File

@ -271,12 +271,7 @@ private:
};
#pragma pack(pop)
/* FIXME: Find some way to autogenerate this value */
#ifdef __x86_64__
const int CYGTLS_PADSIZE = 12800; /* Must be 16-byte aligned */
#else
const int CYGTLS_PADSIZE = 12700;
#endif
#include "cygtls_padsize.h"
/*gentls_offsets*/

14
winsup/cygwin/cygtls_padsize.h Normal file
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@ -0,0 +1,14 @@
/* cygtls_padsize.h: Extra file to be included from utils.
Copyright 2015 Red Hat, Inc.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
/* FIXME: Find some way to autogenerate this value */
#ifdef __x86_64__
const int CYGTLS_PADSIZE = 12800; /* Must be 16-byte aligned */
#else
const int CYGTLS_PADSIZE = 12700;
#endif

11
winsup/cygwin/environ.cc
View File

@ -232,8 +232,7 @@ parse_options (const char *inbuf)
switch (k->disposition)
{
case isfunc:
k->setting.func ((!eq || !istrue) ?
k->values[istrue].s : eq);
k->setting.func ((!eq || !istrue) ? k->values[istrue].s : eq);
debug_printf ("%s (called func)", k->name);
break;
case setdword:
@ -258,10 +257,12 @@ parse_options (const char *inbuf)
break;
}
int n = 0;
if (eq)
*--eq = ch;
int n = eq - p;
{
*--eq = ch;
n = eq - p;
}
p = strdup (keyword_here);
if (n > 0)
p[n] = ':';

2
winsup/cygwin/init.cc
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@ -25,8 +25,10 @@ static bool dll_finished_loading;
static void WINAPI
threadfunc_fe (VOID *arg)
{
#ifndef __x86_64__
(void)__builtin_return_address(1);
asm volatile ("andl $-16,%%esp" ::: "%esp");
#endif
_cygtls::call ((DWORD (*) (void *, void *)) TlsGetValue (_my_oldfunc), arg);
}

3
winsup/cygwin/release/2.2.0
View File

@ -21,3 +21,6 @@ Bug Fixes
- Fix potential hang running ldd(1).
Addresses: https://cygwin.com/ml/cygwin/2015-07/msg00292.html
- Fix crashes under AllocationPreference=0x100000 condition
Addresses: https://cygwin.com/ml/cygwin/2015-02/msg00765.html

6
winsup/utils/ChangeLog
View File

@ -1,3 +1,9 @@
2015-07-29 Corinna Vinschen <corinna@vinschen.de>
* strace.cc (main2): Rename from main.
(main): Make room for _cygtls area on stack and just call main2. Add
comment to explain why.
2015-07-20 Corinna Vinschen <corinna@vinschen.de>
* ldd.cc (STATUS_DLL_NOT_FOUND): Drop definition.

18
winsup/utils/strace.cc
View File

@ -1,7 +1,7 @@
/* strace.cc
Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
2009, 2010, 2011, 2012, 2013 Red Hat Inc.
2009, 2010, 2011, 2012, 2013, 2015 Red Hat Inc.
Written by Chris Faylor <cgf@redhat.com>
@ -26,6 +26,7 @@ details. */
#include "../cygwin/include/sys/strace.h"
#include "../cygwin/include/sys/cygwin.h"
#include "../cygwin/include/cygwin/version.h"
#include "../cygwin/cygtls_padsize.h"
#include "path.h"
#undef cygwin_internal
#include "loadlib.h"
@ -1025,7 +1026,7 @@ print_version ()
}
int
main (int argc, char **argv)
main2 (int argc, char **argv)
{
unsigned mask = 0;
FILE *ofile = NULL;
@ -1165,6 +1166,19 @@ character #%d.\n", optarg, (int) (endptr - optarg), endptr);
return 0;
}
int
main (int argc, char **argv)
{
/* Make sure to have room for the _cygtls area *and* to initialize it.
This is required to make sure cygwin_internal calls into Cygwin work
reliably. This problem has been noticed under AllocationPreference
registry setting to 0x100000 (TOP_DOWN). */
char buf[CYGTLS_PADSIZE];
memset (buf, 0, sizeof (buf));
exit (main2 (argc, argv));
}
#undef CloseHandle
static BOOL