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Close #18294: Fix the zlib module to make it 64-bit safe

This commit is contained in:
Victor Stinner 2013-11-21 22:33:21 +01:00
parent 8820c239f7
commit e079eddf21
2 changed files with 127 additions and 55 deletions
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2
Misc/NEWS
View File

@ -59,6 +59,8 @@ Core and Builtins
Library
-------
- Issue #18294: Fix the zlib module to make it 64-bit safe.
- Issue #19682: Fix compatibility issue with old version of OpenSSL that
was introduced by Issue #18379.

180
Modules/zlibmodule.c
View File

@ -176,7 +176,7 @@ PyZlib_compress(PyObject *self, PyObject *args)
if (!PyArg_ParseTuple(args, "y*|i:compress", &pinput, &level))
return NULL;
if (pinput.len > UINT_MAX) {
if ((size_t)pinput.len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"Size does not fit in an unsigned int");
goto error;
@ -245,6 +245,45 @@ PyZlib_compress(PyObject *self, PyObject *args)
return ReturnVal;
}
/*[python]
class uint_converter(CConverter):
type = 'unsigned int'
converter = 'uint_converter'
[python]*/
/*[python checksum: da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
static int
uint_converter(PyObject *obj, void *ptr)
{
long val;
unsigned long uval;
val = PyLong_AsLong(obj);
if (val == -1 && PyErr_Occurred()) {
uval = PyLong_AsUnsignedLong(obj);
if (uval == (unsigned long)-1 && PyErr_Occurred())
return 0;
if (uval > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"Python int too large for C unsigned int");
return 0;
}
}
else {
if (val < 0) {
PyErr_SetString(PyExc_ValueError,
"value must be positive");
return 0;
}
uval = (unsigned long)val;
}
*(unsigned int *)ptr = Py_SAFE_DOWNCAST(uval, unsigned long, unsigned int);
return 1;
}
PyDoc_STRVAR(decompress__doc__,
"decompress(string[, wbits[, bufsize]]) -- Return decompressed string.\n"
"\n"
@ -260,14 +299,14 @@ PyZlib_decompress(PyObject *self, PyObject *args)
unsigned int length;
int err;
int wsize=DEF_WBITS;
Py_ssize_t r_strlen=DEFAULTALLOC;
unsigned int bufsize = DEFAULTALLOC, new_bufsize;
z_stream zst;
if (!PyArg_ParseTuple(args, "y*|in:decompress",
&pinput, &wsize, &r_strlen))
if (!PyArg_ParseTuple(args, "y*|iO&:decompress",
&pinput, &wsize, uint_converter, &bufsize))
return NULL;
if (pinput.len > UINT_MAX) {
if ((size_t)pinput.len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"Size does not fit in an unsigned int");
goto error;
@ -275,13 +314,13 @@ PyZlib_decompress(PyObject *self, PyObject *args)
input = pinput.buf;
length = (unsigned int)pinput.len;
if (r_strlen <= 0)
r_strlen = 1;
if (bufsize == 0)
bufsize = 1;
zst.avail_in = length;
zst.avail_out = r_strlen;
zst.avail_out = bufsize;
if (!(result_str = PyBytes_FromStringAndSize(NULL, r_strlen)))
if (!(result_str = PyBytes_FromStringAndSize(NULL, bufsize)))
goto error;
zst.opaque = NULL;
@ -326,14 +365,18 @@ PyZlib_decompress(PyObject *self, PyObject *args)
/* fall through */
case(Z_OK):
/* need more memory */
if (_PyBytes_Resize(&result_str, r_strlen << 1) < 0) {
if (bufsize <= (UINT_MAX >> 1))
new_bufsize = bufsize << 1;
else
new_bufsize = UINT_MAX;
if (_PyBytes_Resize(&result_str, new_bufsize) < 0) {
inflateEnd(&zst);
goto error;
}
zst.next_out =
(unsigned char *)PyBytes_AS_STRING(result_str) + r_strlen;
zst.avail_out = r_strlen;
r_strlen = r_strlen << 1;
(unsigned char *)PyBytes_AS_STRING(result_str) + bufsize;
zst.avail_out = bufsize;
bufsize = new_bufsize;
break;
default:
inflateEnd(&zst);
@ -363,7 +406,7 @@ PyZlib_decompress(PyObject *self, PyObject *args)
static PyObject *
PyZlib_compressobj(PyObject *selfptr, PyObject *args, PyObject *kwargs)
{
compobject *self;
compobject *self = NULL;
int level=Z_DEFAULT_COMPRESSION, method=DEFLATED;
int wbits=MAX_WBITS, memLevel=DEF_MEM_LEVEL, strategy=0, err;
Py_buffer zdict;
@ -376,6 +419,12 @@ PyZlib_compressobj(PyObject *selfptr, PyObject *args, PyObject *kwargs)
&memLevel, &strategy, &zdict))
return NULL;
if (zdict.buf != NULL && (size_t)zdict.len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"zdict length does not fit in an unsigned int");
goto error;
}
self = newcompobject(&Comptype);
if (self==NULL)
goto error;
@ -391,7 +440,8 @@ PyZlib_compressobj(PyObject *selfptr, PyObject *args, PyObject *kwargs)
if (zdict.buf == NULL) {
goto success;
} else {
err = deflateSetDictionary(&self->zst, zdict.buf, zdict.len);
err = deflateSetDictionary(&self->zst,
zdict.buf, (unsigned int)zdict.len);
switch (err) {
case (Z_OK):
goto success;
@ -515,7 +565,7 @@ PyZlib_objcompress(compobject *self, PyObject *args)
{
int err;
unsigned int inplen;
Py_ssize_t length = DEFAULTALLOC;
unsigned int length = DEFAULTALLOC, new_length;
PyObject *RetVal = NULL;
Py_buffer pinput;
Byte *input;
@ -523,13 +573,13 @@ PyZlib_objcompress(compobject *self, PyObject *args)
if (!PyArg_ParseTuple(args, "y*:compress", &pinput))
return NULL;
if (pinput.len > UINT_MAX) {
if ((size_t)pinput.len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"Size does not fit in an unsigned int");
goto error_outer;
}
input = pinput.buf;
inplen = pinput.len;
inplen = (unsigned int)pinput.len;
if (!(RetVal = PyBytes_FromStringAndSize(NULL, length)))
goto error_outer;
@ -549,14 +599,18 @@ PyZlib_objcompress(compobject *self, PyObject *args)
/* while Z_OK and the output buffer is full, there might be more output,
so extend the output buffer and try again */
while (err == Z_OK && self->zst.avail_out == 0) {
if (_PyBytes_Resize(&RetVal, length << 1) < 0) {
if (length <= (UINT_MAX >> 1))
new_length = length << 1;
else
new_length = UINT_MAX;
if (_PyBytes_Resize(&RetVal, new_length) < 0) {
Py_CLEAR(RetVal);
goto error;
}
self->zst.next_out =
(unsigned char *)PyBytes_AS_STRING(RetVal) + length;
self->zst.avail_out = length;
length = length << 1;
length = new_length;
Py_BEGIN_ALLOW_THREADS
err = deflate(&(self->zst), Z_NO_FLUSH);
@ -596,7 +650,7 @@ save_unconsumed_input(compobject *self, int err)
Py_ssize_t old_size = PyBytes_GET_SIZE(self->unused_data);
Py_ssize_t new_size;
PyObject *new_data;
if ((Py_ssize_t)self->zst.avail_in > PY_SSIZE_T_MAX - old_size) {
if ((size_t)self->zst.avail_in > (size_t)UINT_MAX - (size_t)old_size) {
PyErr_NoMemory();
return -1;
}
@ -636,7 +690,7 @@ zlib.Decompress.decompress
data: Py_buffer
The binary data to decompress.
max_length: int = 0
max_length: uint = 0
The maximum allowable length of the decompressed data.
Unconsumed input data will be stored in
the unconsumed_tail attribute.
@ -668,18 +722,18 @@ PyDoc_STRVAR(zlib_Decompress_decompress__doc__,
{"decompress", (PyCFunction)zlib_Decompress_decompress, METH_VARARGS, zlib_Decompress_decompress__doc__},
static PyObject *
zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, int max_length);
zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, unsigned int max_length);
static PyObject *
zlib_Decompress_decompress(PyObject *self, PyObject *args)
{
PyObject *return_value = NULL;
Py_buffer data;
int max_length = 0;
unsigned int max_length = 0;
if (!PyArg_ParseTuple(args,
"y*|i:decompress",
&data, &max_length))
"y*|O&:decompress",
&data, uint_converter, &max_length))
goto exit;
return_value = zlib_Decompress_decompress_impl(self, &data, max_length);
@ -691,29 +745,20 @@ exit:
}
static PyObject *
zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, int max_length)
/*[clinic checksum: bfac7a0f07e891869d87c665a76dc2611014420f]*/
zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, unsigned int max_length)
/*[clinic checksum: 76ca9259e3f5ca86bae9da3d0e75637b5d492234]*/
{
compobject *zself = (compobject *)self;
int err;
unsigned int inplen;
Py_ssize_t old_length, length = DEFAULTALLOC;
unsigned int old_length, length = DEFAULTALLOC;
PyObject *RetVal = NULL;
Byte *input;
unsigned long start_total_out;
if (data->len > UINT_MAX) {
if ((size_t)data->len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"Size does not fit in an unsigned int");
return NULL;
}
input = data->buf;
inplen = data->len;
if (max_length < 0) {
PyErr_SetString(PyExc_ValueError,
"max_length must be greater than zero");
return NULL;
}
/* limit amount of data allocated to max_length */
if (max_length && length > max_length)
@ -724,8 +769,8 @@ zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, int max_length)
ENTER_ZLIB(zself);
start_total_out = zself->zst.total_out;
zself->zst.avail_in = inplen;
zself->zst.next_in = input;
zself->zst.avail_in = (unsigned int)data->len;
zself->zst.next_in = data->buf;
zself->zst.avail_out = length;
zself->zst.next_out = (unsigned char *)PyBytes_AS_STRING(RetVal);
@ -740,12 +785,21 @@ zlib_Decompress_decompress_impl(PyObject *self, Py_buffer *data, int max_length)
RetVal = NULL;
goto error;
}
err = inflateSetDictionary(&(zself->zst), zdict_buf.buf, zdict_buf.len);
if ((size_t)zdict_buf.len > UINT_MAX) {
PyErr_SetString(PyExc_OverflowError,
"zdict length does not fit in an unsigned int");
PyBuffer_Release(&zdict_buf);
Py_CLEAR(RetVal);
goto error;
}
err = inflateSetDictionary(&(zself->zst),
zdict_buf.buf, (unsigned int)zdict_buf.len);
PyBuffer_Release(&zdict_buf);
if (err != Z_OK) {
zlib_error(zself->zst, err, "while decompressing data");
Py_DECREF(RetVal);
RetVal = NULL;
Py_CLEAR(RetVal);
goto error;
}
/* Repeat the call to inflate. */
@ -824,7 +878,8 @@ PyDoc_STRVAR(comp_flush__doc__,
static PyObject *
PyZlib_flush(compobject *self, PyObject *args)
{
int err, length = DEFAULTALLOC;
int err;
unsigned int length = DEFAULTALLOC, new_length;
PyObject *RetVal;
int flushmode = Z_FINISH;
unsigned long start_total_out;
@ -855,14 +910,18 @@ PyZlib_flush(compobject *self, PyObject *args)
/* while Z_OK and the output buffer is full, there might be more output,
so extend the output buffer and try again */
while (err == Z_OK && self->zst.avail_out == 0) {
if (_PyBytes_Resize(&RetVal, length << 1) < 0) {
if (length <= (UINT_MAX >> 1))
new_length = length << 1;
else
new_length = UINT_MAX;
if (_PyBytes_Resize(&RetVal, new_length) < 0) {
Py_CLEAR(RetVal);
goto error;
}
self->zst.next_out =
(unsigned char *)PyBytes_AS_STRING(RetVal) + length;
self->zst.avail_out = length;
length = length << 1;
length = new_length;
Py_BEGIN_ALLOW_THREADS
err = deflate(&(self->zst), flushmode);
@ -1041,24 +1100,31 @@ PyDoc_STRVAR(decomp_flush__doc__,
static PyObject *
PyZlib_unflush(compobject *self, PyObject *args)
{
int err, length = DEFAULTALLOC;
int err;
unsigned int length = DEFAULTALLOC, new_length;
PyObject * retval = NULL;
unsigned long start_total_out;
Py_ssize_t size;
if (!PyArg_ParseTuple(args, "|i:flush", &length))
if (!PyArg_ParseTuple(args, "|O&:flush", uint_converter, &length))
return NULL;
if (length <= 0) {
if (length == 0) {
PyErr_SetString(PyExc_ValueError, "length must be greater than zero");
return NULL;
}
if (!(retval = PyBytes_FromStringAndSize(NULL, length)))
return NULL;
ENTER_ZLIB(self);
size = PyBytes_GET_SIZE(self->unconsumed_tail);
start_total_out = self->zst.total_out;
self->zst.avail_in = PyBytes_GET_SIZE(self->unconsumed_tail);
/* save_unconsumed_input() ensures that unconsumed_tail length is lesser
or equal than UINT_MAX */
self->zst.avail_in = Py_SAFE_DOWNCAST(size, Py_ssize_t, unsigned int);
self->zst.next_in = (Byte *)PyBytes_AS_STRING(self->unconsumed_tail);
self->zst.avail_out = length;
self->zst.next_out = (Byte *)PyBytes_AS_STRING(retval);
@ -1070,13 +1136,17 @@ PyZlib_unflush(compobject *self, PyObject *args)
/* while Z_OK and the output buffer is full, there might be more output,
so extend the output buffer and try again */
while ((err == Z_OK || err == Z_BUF_ERROR) && self->zst.avail_out == 0) {
if (_PyBytes_Resize(&retval, length << 1) < 0) {
if (length <= (UINT_MAX >> 1))
new_length = length << 1;
else
new_length = UINT_MAX;
if (_PyBytes_Resize(&retval, new_length) < 0) {
Py_CLEAR(retval);
goto error;
}
self->zst.next_out = (Byte *)PyBytes_AS_STRING(retval) + length;
self->zst.avail_out = length;
length = length << 1;
length = new_length;
Py_BEGIN_ALLOW_THREADS
err = inflate(&(self->zst), Z_FINISH);
@ -1168,7 +1238,7 @@ PyZlib_adler32(PyObject *self, PyObject *args)
Py_BEGIN_ALLOW_THREADS
/* Avoid truncation of length for very large buffers. adler32() takes
length as an unsigned int, which may be narrower than Py_ssize_t. */
while (len > (size_t) UINT_MAX) {
while ((size_t)len > UINT_MAX) {
adler32val = adler32(adler32val, buf, UINT_MAX);
buf += (size_t) UINT_MAX;
len -= (size_t) UINT_MAX;
@ -1206,7 +1276,7 @@ PyZlib_crc32(PyObject *self, PyObject *args)
Py_BEGIN_ALLOW_THREADS
/* Avoid truncation of length for very large buffers. crc32() takes
length as an unsigned int, which may be narrower than Py_ssize_t. */
while (len > (size_t) UINT_MAX) {
while ((size_t)len > UINT_MAX) {
crc32val = crc32(crc32val, buf, UINT_MAX);
buf += (size_t) UINT_MAX;
len -= (size_t) UINT_MAX;