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Issue #23524: Replace _PyVerify_fd function with calling _set_thread_local_invalid_parameter_handler on every thread.

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This commit is contained in:
Steve Dower 2015-03-06 14:47:02 -08:00
parent eef20de744
commit d81431f587
9 changed files with 160 additions and 112 deletions
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11
Include/fileobject.h
View file

@ -32,17 +32,6 @@ PyAPI_DATA(int) Py_HasFileSystemDefaultEncoding;
#ifndef Py_LIMITED_API
PyAPI_FUNC(PyObject *) PyFile_NewStdPrinter(int);
PyAPI_DATA(PyTypeObject) PyStdPrinter_Type;
#if defined _MSC_VER && _MSC_VER >= 1400
/* A routine to check if a file descriptor is valid on Windows. Returns 0
* and sets errno to EBADF if it isn't. This is to avoid Assertions
* from various functions in the Windows CRT beginning with
* Visual Studio 2005
*/
int _PyVerify_fd(int fd);
#else
#define _PyVerify_fd(A) (1) /* dummy */
#endif
#endif /* Py_LIMITED_API */
/* A routine to check if a file descriptor can be select()-ed. */

12
Include/fileutils.h
View file

@ -108,6 +108,18 @@ PyAPI_FUNC(int) _Py_get_blocking(int fd);
PyAPI_FUNC(int) _Py_set_blocking(int fd, int blocking);
#endif /* !MS_WINDOWS */
#if defined _MSC_VER && _MSC_VER >= 1400
/* A routine to check if a file descriptor is valid on Windows. Returns 0
* and sets errno to EBADF if it isn't. This is to avoid Assertions
* from various functions in the Windows CRT beginning with
* Visual Studio 2005
*/
int _PyVerify_fd(int fd);
#else
#define _PyVerify_fd(A) (1) /* dummy */
#endif
#endif /* Py_LIMITED_API */
#ifdef __cplusplus

2
Modules/_io/fileio.c
View file

@ -182,7 +182,7 @@ check_fd(int fd)
{
#if defined(HAVE_FSTAT) || defined(MS_WINDOWS)
struct _Py_stat_struct buf;
if (!_PyVerify_fd(fd) || (_Py_fstat(fd, &buf) < 0 && errno == EBADF)) {
if (_Py_fstat(fd, &buf) < 0 && errno == EBADF) {
PyObject *exc;
char *msg = strerror(EBADF);
exc = PyObject_CallFunction(PyExc_OSError, "(is)",

92
Modules/posixmodule.c
View file

@ -1051,99 +1051,16 @@ PyLong_FromPy_off_t(Py_off_t offset)
}
#if defined _MSC_VER && _MSC_VER >= 1400
/* Microsoft CRT in VS2005 and higher will verify that a filehandle is
* valid and raise an assertion if it isn't.
* Normally, an invalid fd is likely to be a C program error and therefore
* an assertion can be useful, but it does contradict the POSIX standard
* which for write(2) states:
* "Otherwise, -1 shall be returned and errno set to indicate the error."
* "[EBADF] The fildes argument is not a valid file descriptor open for
* writing."
* Furthermore, python allows the user to enter any old integer
* as a fd and should merely raise a python exception on error.
* The Microsoft CRT doesn't provide an official way to check for the
* validity of a file descriptor, but we can emulate its internal behaviour
* by using the exported __pinfo data member and knowledge of the
* internal structures involved.
* The structures below must be updated for each version of visual studio
* according to the file internal.h in the CRT source, until MS comes
* up with a less hacky way to do this.
* (all of this is to avoid globally modifying the CRT behaviour using
* _set_invalid_parameter_handler() and _CrtSetReportMode())
#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
/* Legacy implementation of _PyVerify_fd_dup2 while transitioning to
* MSVC 14.0. This should eventually be removed. (issue23524)
*/
/* The actual size of the structure is determined at runtime.
* Only the first items must be present.
*/
#if _MSC_VER >= 1900
typedef struct {
CRITICAL_SECTION lock;
intptr_t osfhnd;
__int64 startpos;
char osfile;
} my_ioinfo;
#define IOINFO_L2E 6
#define IOINFO_ARRAYS 128
#else
typedef struct {
intptr_t osfhnd;
char osfile;
} my_ioinfo;
#define IOINFO_L2E 5
#define IOINFO_ARRAYS 64
#endif
extern __declspec(dllimport) char * __pioinfo[];
#define IOINFO_ARRAY_ELTS (1 << IOINFO_L2E)
#define _NHANDLE_ (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
#define FOPEN 0x01
#define _NO_CONSOLE_FILENO (intptr_t)-2
/* This function emulates what the windows CRT does to validate file handles */
int
_PyVerify_fd(int fd)
{
const int i1 = fd >> IOINFO_L2E;
const int i2 = fd & ((1 << IOINFO_L2E) - 1);
static size_t sizeof_ioinfo = 0;
/* Determine the actual size of the ioinfo structure,
* as used by the CRT loaded in memory
*/
if (sizeof_ioinfo == 0 && __pioinfo[0] != NULL) {
sizeof_ioinfo = _msize(__pioinfo[0]) / IOINFO_ARRAY_ELTS;
}
if (sizeof_ioinfo == 0) {
/* This should not happen... */
goto fail;
}
/* See that it isn't a special CLEAR fileno */
if (fd != _NO_CONSOLE_FILENO) {
/* Microsoft CRT would check that 0<=fd<_nhandle but we can't do that. Instead
* we check pointer validity and other info
*/
if (0 <= i1 && i1 < IOINFO_ARRAYS && __pioinfo[i1] != NULL) {
/* finally, check that the file is open */
my_ioinfo* info = (my_ioinfo*)(__pioinfo[i1] + i2 * sizeof_ioinfo);
if (info->osfile & FOPEN) {
return 1;
}
}
}
fail:
errno = EBADF;
return 0;
}
/* the special case of checking dup2. The target fd must be in a sensible range */
static int
_PyVerify_fd_dup2(int fd1, int fd2)
@ -1158,8 +1075,7 @@ _PyVerify_fd_dup2(int fd1, int fd2)
return 0;
}
#else
/* dummy version. _PyVerify_fd() is already defined in fileobject.h */
#define _PyVerify_fd_dup2(A, B) (1)
#define _PyVerify_fd_dup2(fd1, fd2) (_PyVerify_fd(fd1) && (fd2) >= 0)
#endif
#ifdef MS_WINDOWS

22
PC/invalid_parameter_handler.c Normal file
View file

@ -0,0 +1,22 @@
#ifdef _MSC_VER
#include <stdlib.h>
#if _MSC_VER >= 1900
/* pyconfig.h uses this function in the _Py_BEGIN/END_SUPPRESS_IPH
* macros. It does not need to be defined when building using MSVC
* earlier than 14.0 (_MSC_VER == 1900).
*/
static void __cdecl _silent_invalid_parameter_handler(
wchar_t const* expression,
wchar_t const* function,
wchar_t const* file,
unsigned int line,
uintptr_t pReserved) { }
void *_Py_silent_invalid_parameter_handler =
(void*)_silent_invalid_parameter_handler;
#endif
#endif

11
PCbuild/pythoncore.vcxproj
View file

@ -333,6 +333,7 @@
<ClCompile Include="..\Parser\parser.c" />
<ClCompile Include="..\Parser\parsetok.c" />
<ClCompile Include="..\Parser\tokenizer.c" />
<ClCompile Include="..\PC\invalid_parameter_handler.c" />
<ClCompile Include="..\PC\winreg.c" />
<ClCompile Include="..\PC\config.c" />
<ClCompile Include="..\PC\getpathp.c" />
@ -394,25 +395,21 @@
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>
<Target Name="_GetBuildInfo" BeforeTargets="PrepareForBuild">
<Exec Command='hg id -b &gt; "$(IntDir)hgbranch.txt"' ContinueOnError="true" />
<Exec Command='hg id -i &gt; "$(IntDir)hgversion.txt"' ContinueOnError="true" />
<Exec Command='hg id -t &gt; "$(IntDir)hgtag.txt"' ContinueOnError="true" />
<Exec Command="hg id -b &gt; &quot;$(IntDir)hgbranch.txt&quot;" ContinueOnError="true" />
<Exec Command="hg id -i &gt; &quot;$(IntDir)hgversion.txt&quot;" ContinueOnError="true" />
<Exec Command="hg id -t &gt; &quot;$(IntDir)hgtag.txt&quot;" ContinueOnError="true" />
<PropertyGroup>
<HgBranch Condition="Exists('$(IntDir)hgbranch.txt')">$([System.IO.File]::ReadAllText('$(IntDir)hgbranch.txt').Trim())</HgBranch>
<HgVersion Condition="Exists('$(IntDir)hgversion.txt')">$([System.IO.File]::ReadAllText('$(IntDir)hgversion.txt').Trim())</HgVersion>
<HgTag Condition="Exists('$(IntDir)hgtag.txt')">$([System.IO.File]::ReadAllText('$(IntDir)hgtag.txt').Trim())</HgTag>
</PropertyGroup>
<ItemGroup>
<ClCompile Include="..\Modules\getbuildinfo.c">
<PreprocessorDefinitions>HGVERSION="$(HgVersion)";HGTAG="$(HgTag)";HGBRANCH="$(HgBranch)";%(PreprocessorDefinitions)</PreprocessorDefinitions>
</ClCompile>
</ItemGroup>
</Target>
<Target Name="_WarnAboutToolset" BeforeTargets="PrepareForBuild" Condition="$(PlatformToolset) != 'v140'">
<Warning Text="Toolset $(PlatformToolset) is not used for official builds. Your build may have errors or incompatibilities." />
</Target>

3
PCbuild/pythoncore.vcxproj.filters
View file

@ -959,6 +959,9 @@
<ClCompile Include="..\Modules\hashtable.c">
<Filter>Modules</Filter>
</ClCompile>
<ClCompile Include="..\PC\invalid_parameter_handler.c">
<Filter>PC</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ResourceCompile Include="..\PC\python_nt.rc">

108
Python/fileutils.c
View file

@ -3,6 +3,7 @@
#include <locale.h>
#ifdef MS_WINDOWS
# include <malloc.h>
# include <windows.h>
#endif
@ -636,14 +637,10 @@ _Py_fstat(int fd, struct _Py_stat_struct *result)
else
h = (HANDLE)_get_osfhandle(fd);
/* Protocol violation: we explicitly clear errno, instead of
setting it to a POSIX error. Callers should use GetLastError. */
errno = 0;
if (h == INVALID_HANDLE_VALUE) {
/* This is really a C library error (invalid file handle).
We set the Win32 error to the closes one matching. */
SetLastError(ERROR_INVALID_HANDLE);
errno = EBADF;
return -1;
}
memset(result, 0, sizeof(*result));
@ -652,6 +649,7 @@ _Py_fstat(int fd, struct _Py_stat_struct *result)
if (type == FILE_TYPE_UNKNOWN) {
DWORD error = GetLastError();
if (error != 0) {
errno = EINVAL;
return -1;
}
/* else: valid but unknown file */
@ -666,6 +664,7 @@ _Py_fstat(int fd, struct _Py_stat_struct *result)
}
if (!GetFileInformationByHandle(h, &info)) {
errno = EINVAL;
return -1;
}
@ -1267,3 +1266,102 @@ _Py_set_blocking(int fd, int blocking)
}
#endif
#ifdef _MSC_VER
#if _MSC_VER >= 1900
/* This function lets the Windows CRT validate the file handle without
terminating the process if it's invalid. */
int
_PyVerify_fd(int fd)
{
intptr_t osh;
/* Fast check for the only condition we know */
if (fd < 0) {
_set_errno(EBADF);
return 0;
}
osh = _get_osfhandle(fd);
return osh != (intptr_t)-1;
}
#elif _MSC_VER >= 1400
/* Legacy implementation of _PyVerify_fd while transitioning to
* MSVC 14.0. This should eventually be removed. (issue23524)
*/
/* Microsoft CRT in VS2005 and higher will verify that a filehandle is
* valid and raise an assertion if it isn't.
* Normally, an invalid fd is likely to be a C program error and therefore
* an assertion can be useful, but it does contradict the POSIX standard
* which for write(2) states:
* "Otherwise, -1 shall be returned and errno set to indicate the error."
* "[EBADF] The fildes argument is not a valid file descriptor open for
* writing."
* Furthermore, python allows the user to enter any old integer
* as a fd and should merely raise a python exception on error.
* The Microsoft CRT doesn't provide an official way to check for the
* validity of a file descriptor, but we can emulate its internal behaviour
* by using the exported __pinfo data member and knowledge of the
* internal structures involved.
* The structures below must be updated for each version of visual studio
* according to the file internal.h in the CRT source, until MS comes
* up with a less hacky way to do this.
* (all of this is to avoid globally modifying the CRT behaviour using
* _set_invalid_parameter_handler() and _CrtSetReportMode())
*/
/* The actual size of the structure is determined at runtime.
* Only the first items must be present.
*/
typedef struct {
intptr_t osfhnd;
char osfile;
} my_ioinfo;
extern __declspec(dllimport) char * __pioinfo[];
#define IOINFO_L2E 5
#define IOINFO_ARRAYS 64
#define IOINFO_ARRAY_ELTS (1 << IOINFO_L2E)
#define _NHANDLE_ (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
#define FOPEN 0x01
#define _NO_CONSOLE_FILENO (intptr_t)-2
/* This function emulates what the windows CRT does to validate file handles */
int
_PyVerify_fd(int fd)
{
const int i1 = fd >> IOINFO_L2E;
const int i2 = fd & ((1 << IOINFO_L2E) - 1);
static size_t sizeof_ioinfo = 0;
/* Determine the actual size of the ioinfo structure,
* as used by the CRT loaded in memory
*/
if (sizeof_ioinfo == 0 && __pioinfo[0] != NULL) {
sizeof_ioinfo = _msize(__pioinfo[0]) / IOINFO_ARRAY_ELTS;
}
if (sizeof_ioinfo == 0) {
/* This should not happen... */
goto fail;
}
/* See that it isn't a special CLEAR fileno */
if (fd != _NO_CONSOLE_FILENO) {
/* Microsoft CRT would check that 0<=fd<_nhandle but we can't do that. Instead
* we check pointer validity and other info
*/
if (0 <= i1 && i1 < IOINFO_ARRAYS && __pioinfo[i1] != NULL) {
/* finally, check that the file is open */
my_ioinfo* info = (my_ioinfo*)(__pioinfo[i1] + i2 * sizeof_ioinfo);
if (info->osfile & FOPEN) {
return 1;
}
}
}
fail:
errno = EBADF;
return 0;
}
#endif /* _MSC_VER >= 1900 || _MSC_VER >= 1400 */
#endif /* defined _MSC_VER */

11
Python/pystate.c
View file

@ -22,6 +22,12 @@ to avoid the expense of doing their own locking).
#endif
#endif
#if defined _MSC_VER && _MSC_VER >= 1900
/* Issue #23524: Temporary fix to disable termination due to invalid parameters */
PyAPI_DATA(void*) _Py_silent_invalid_parameter_handler;
#include <stdlib.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
@ -222,6 +228,11 @@ new_threadstate(PyInterpreterState *interp, int init)
tstate->next->prev = tstate;
interp->tstate_head = tstate;
HEAD_UNLOCK();
#if defined _MSC_VER && _MSC_VER >= 1900
/* Issue #23524: Temporary fix to disable termination due to invalid parameters */
_set_thread_local_invalid_parameter_handler((_invalid_parameter_handler)_Py_silent_invalid_parameter_handler);
#endif
}
return tstate;