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Closes #12291: Fixed bug which was found when doing multiple loads from one stream.

This commit is contained in:
Vinay Sajip 2011-07-02 16:42:47 +01:00
parent a4a04069fd
commit 5bdae3bb7c
4 changed files with 183 additions and 61 deletions
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2
Lib/importlib/test/source/test_file_loader.py
View File

@ -214,7 +214,7 @@ class BadBytecodeTest(unittest.TestCase):
lambda bc: bc[:8] + b'<test>',
del_source=del_source)
file_path = mapping['_temp'] if not del_source else bytecode_path
with self.assertRaises(ValueError):
with self.assertRaises(EOFError):
self.import_(file_path, '_temp')
def _test_bad_magic(self, test, *, del_source=False):

24
Lib/test/test_marshal.py
View File

@ -211,6 +211,30 @@ class BugsTestCase(unittest.TestCase):
invalid_string = b'l\x02\x00\x00\x00\x00\x00\x00\x00'
self.assertRaises(ValueError, marshal.loads, invalid_string)
def test_multiple_dumps_and_loads(self):
# Issue 12291: marshal.load() should be callable multiple times
# with interleaved data written by non-marshal code
# Adapted from a patch by Engelbert Gruber.
data = (1, 'abc', b'def', 1.0, (2, 'a', ['b', b'c']))
for interleaved in (b'', b'0123'):
ilen = len(interleaved)
positions = []
try:
with open(support.TESTFN, 'wb') as f:
for d in data:
marshal.dump(d, f)
if ilen:
f.write(interleaved)
positions.append(f.tell())
with open(support.TESTFN, 'rb') as f:
for i, d in enumerate(data):
self.assertEqual(d, marshal.load(f))
if ilen:
f.read(ilen)
self.assertEqual(positions[i], f.tell())
finally:
support.unlink(support.TESTFN)
def test_main():
support.run_unittest(IntTestCase,

3
Misc/NEWS
View File

@ -10,6 +10,9 @@ What's New in Python 3.2.1 release candidate 2?
Core and Builtins
-----------------
- Issue #12291: You can now load multiple marshalled objects from a stream,
with other data interleaved between marshalled objects.
- Issue #12084: os.stat on Windows now works properly with relative symbolic
links when called from any directory.

215
Python/marshal.c
View File

@ -57,6 +57,7 @@ typedef struct {
int error; /* see WFERR_* values */
int depth;
/* If fp == NULL, the following are valid: */
PyObject * readable; /* Stream-like object being read from */
PyObject *str;
char *ptr;
char *end;
@ -466,27 +467,75 @@ typedef WFILE RFILE; /* Same struct with different invariants */
#define rs_byte(p) (((p)->ptr < (p)->end) ? (unsigned char)*(p)->ptr++ : EOF)
#define r_byte(p) ((p)->fp ? getc((p)->fp) : rs_byte(p))
static int
r_string(char *s, int n, RFILE *p)
{
if (p->fp != NULL)
/* The result fits into int because it must be <=n. */
return (int)fread(s, 1, n, p->fp);
if (p->end - p->ptr < n)
n = (int)(p->end - p->ptr);
memcpy(s, p->ptr, n);
p->ptr += n;
return n;
char * ptr;
int read, left;
if (!p->readable) {
if (p->fp != NULL)
/* The result fits into int because it must be <=n. */
read = (int) fread(s, 1, n, p->fp);
else {
left = (int)(p->end - p->ptr);
read = (left < n) ? left : n;
memcpy(s, p->ptr, read);
p->ptr += read;
}
}
else {
PyObject *data = PyObject_CallMethod(p->readable, "read", "i", n);
read = 0;
if (data != NULL) {
if (!PyBytes_Check(data)) {
PyErr_Format(PyExc_TypeError,
"f.read() returned not bytes but %.100s",
data->ob_type->tp_name);
}
else {
read = PyBytes_GET_SIZE(data);
if (read > 0) {
ptr = PyBytes_AS_STRING(data);
memcpy(s, ptr, read);
}
}
Py_DECREF(data);
}
}
if (!PyErr_Occurred() && (read < n)) {
PyErr_SetString(PyExc_EOFError, "EOF read where not expected");
}
return read;
}
static int
r_byte(RFILE *p)
{
int c = EOF;
unsigned char ch;
int n;
if (!p->readable)
c = p->fp ? getc(p->fp) : rs_byte(p);
else {
n = r_string((char *) &ch, 1, p);
if (n > 0)
c = ch;
}
return c;
}
static int
r_short(RFILE *p)
{
register short x;
x = r_byte(p);
x |= r_byte(p) << 8;
unsigned char buffer[2];
r_string((char *) buffer, 2, p);
x = buffer[0];
x |= buffer[1] << 8;
/* Sign-extension, in case short greater than 16 bits */
x |= -(x & 0x8000);
return x;
@ -496,19 +545,13 @@ static long
r_long(RFILE *p)
{
register long x;
register FILE *fp = p->fp;
if (fp) {
x = getc(fp);
x |= (long)getc(fp) << 8;
x |= (long)getc(fp) << 16;
x |= (long)getc(fp) << 24;
}
else {
x = rs_byte(p);
x |= (long)rs_byte(p) << 8;
x |= (long)rs_byte(p) << 16;
x |= (long)rs_byte(p) << 24;
}
unsigned char buffer[4];
r_string((char *) buffer, 4, p);
x = buffer[0];
x |= (long)buffer[1] << 8;
x |= (long)buffer[2] << 16;
x |= (long)buffer[3] << 24;
#if SIZEOF_LONG > 4
/* Sign extension for 64-bit machines */
x |= -(x & 0x80000000L);
@ -526,25 +569,30 @@ r_long(RFILE *p)
static PyObject *
r_long64(RFILE *p)
{
PyObject * result = NULL;
long lo4 = r_long(p);
long hi4 = r_long(p);
if (!PyErr_Occurred()) {
#if SIZEOF_LONG > 4
long x = (hi4 << 32) | (lo4 & 0xFFFFFFFFL);
return PyLong_FromLong(x);
long x = (hi4 << 32) | (lo4 & 0xFFFFFFFFL);
result = PyLong_FromLong(x);
#else
unsigned char buf[8];
int one = 1;
int is_little_endian = (int)*(char*)&one;
if (is_little_endian) {
memcpy(buf, &lo4, 4);
memcpy(buf+4, &hi4, 4);
}
else {
memcpy(buf, &hi4, 4);
memcpy(buf+4, &lo4, 4);
}
return _PyLong_FromByteArray(buf, 8, is_little_endian, 1);
unsigned char buf[8];
int one = 1;
int is_little_endian = (int)*(char*)&one;
if (is_little_endian) {
memcpy(buf, &lo4, 4);
memcpy(buf+4, &hi4, 4);
}
else {
memcpy(buf, &hi4, 4);
memcpy(buf+4, &lo4, 4);
}
result = _PyLong_FromByteArray(buf, 8, is_little_endian, 1);
#endif
}
return result;
}
static PyObject *
@ -556,6 +604,8 @@ r_PyLong(RFILE *p)
digit d;
n = r_long(p);
if (PyErr_Occurred())
return NULL;
if (n == 0)
return (PyObject *)_PyLong_New(0);
if (n < -INT_MAX || n > INT_MAX) {
@ -575,6 +625,8 @@ r_PyLong(RFILE *p)
d = 0;
for (j=0; j < PyLong_MARSHAL_RATIO; j++) {
md = r_short(p);
if (PyErr_Occurred())
break;
if (md < 0 || md > PyLong_MARSHAL_BASE)
goto bad_digit;
d += (digit)md << j*PyLong_MARSHAL_SHIFT;
@ -584,6 +636,8 @@ r_PyLong(RFILE *p)
d = 0;
for (j=0; j < shorts_in_top_digit; j++) {
md = r_short(p);
if (PyErr_Occurred())
break;
if (md < 0 || md > PyLong_MARSHAL_BASE)
goto bad_digit;
/* topmost marshal digit should be nonzero */
@ -595,6 +649,10 @@ r_PyLong(RFILE *p)
}
d += (digit)md << j*PyLong_MARSHAL_SHIFT;
}
if (PyErr_Occurred()) {
Py_DECREF(ob);
return NULL;
}
/* top digit should be nonzero, else the resulting PyLong won't be
normalized */
ob->ob_digit[size-1] = d;
@ -663,7 +721,8 @@ r_object(RFILE *p)
break;
case TYPE_INT:
retval = PyLong_FromLong(r_long(p));
n = r_long(p);
retval = PyErr_Occurred() ? NULL : PyLong_FromLong(n);
break;
case TYPE_INT64:
@ -773,6 +832,10 @@ r_object(RFILE *p)
case TYPE_STRING:
n = r_long(p);
if (PyErr_Occurred()) {
retval = NULL;
break;
}
if (n < 0 || n > INT_MAX) {
PyErr_SetString(PyExc_ValueError, "bad marshal data (string size out of range)");
retval = NULL;
@ -798,6 +861,10 @@ r_object(RFILE *p)
char *buffer;
n = r_long(p);
if (PyErr_Occurred()) {
retval = NULL;
break;
}
if (n < 0 || n > INT_MAX) {
PyErr_SetString(PyExc_ValueError, "bad marshal data (unicode size out of range)");
retval = NULL;
@ -823,6 +890,10 @@ r_object(RFILE *p)
case TYPE_TUPLE:
n = r_long(p);
if (PyErr_Occurred()) {
retval = NULL;
break;
}
if (n < 0 || n > INT_MAX) {
PyErr_SetString(PyExc_ValueError, "bad marshal data (tuple size out of range)");
retval = NULL;
@ -850,6 +921,10 @@ r_object(RFILE *p)
case TYPE_LIST:
n = r_long(p);
if (PyErr_Occurred()) {
retval = NULL;
break;
}
if (n < 0 || n > INT_MAX) {
PyErr_SetString(PyExc_ValueError, "bad marshal data (list size out of range)");
retval = NULL;
@ -902,6 +977,10 @@ r_object(RFILE *p)
case TYPE_SET:
case TYPE_FROZENSET:
n = r_long(p);
if (PyErr_Occurred()) {
retval = NULL;
break;
}
if (n < 0 || n > INT_MAX) {
PyErr_SetString(PyExc_ValueError, "bad marshal data (set size out of range)");
retval = NULL;
@ -955,10 +1034,20 @@ r_object(RFILE *p)
/* XXX ignore long->int overflows for now */
argcount = (int)r_long(p);
if (PyErr_Occurred())
goto code_error;
kwonlyargcount = (int)r_long(p);
if (PyErr_Occurred())
goto code_error;
nlocals = (int)r_long(p);
if (PyErr_Occurred())
goto code_error;
stacksize = (int)r_long(p);
if (PyErr_Occurred())
goto code_error;
flags = (int)r_long(p);
if (PyErr_Occurred())
goto code_error;
code = r_object(p);
if (code == NULL)
goto code_error;
@ -1040,6 +1129,7 @@ PyMarshal_ReadShortFromFile(FILE *fp)
{
RFILE rf;
assert(fp);
rf.readable = NULL;
rf.fp = fp;
rf.strings = NULL;
rf.end = rf.ptr = NULL;
@ -1051,6 +1141,7 @@ PyMarshal_ReadLongFromFile(FILE *fp)
{
RFILE rf;
rf.fp = fp;
rf.readable = NULL;
rf.strings = NULL;
rf.ptr = rf.end = NULL;
return r_long(&rf);
@ -1112,6 +1203,7 @@ PyMarshal_ReadObjectFromFile(FILE *fp)
RFILE rf;
PyObject *result;
rf.fp = fp;
rf.readable = NULL;
rf.strings = PyList_New(0);
rf.depth = 0;
rf.ptr = rf.end = NULL;
@ -1126,6 +1218,7 @@ PyMarshal_ReadObjectFromString(char *str, Py_ssize_t len)
RFILE rf;
PyObject *result;
rf.fp = NULL;
rf.readable = NULL;
rf.ptr = str;
rf.end = str + len;
rf.strings = PyList_New(0);
@ -1142,6 +1235,7 @@ PyMarshal_WriteObjectToString(PyObject *x, int version)
PyObject *res = NULL;
wf.fp = NULL;
wf.readable = NULL;
wf.str = PyBytes_FromStringAndSize((char *)NULL, 50);
if (wf.str == NULL)
return NULL;
@ -1219,33 +1313,33 @@ The version argument indicates the data format that dump should use.");
static PyObject *
marshal_load(PyObject *self, PyObject *f)
{
/* XXX Quick hack -- need to do this differently */
PyObject *data, *result;
RFILE rf;
data = PyObject_CallMethod(f, "read", "");
char *p;
int n;
/*
* Make a call to the read method, but read zero bytes.
* This is to ensure that the object passed in at least
* has a read method which returns bytes.
*/
data = PyObject_CallMethod(f, "read", "i", 0);
if (data == NULL)
return NULL;
rf.fp = NULL;
if (PyBytes_Check(data)) {
rf.ptr = PyBytes_AS_STRING(data);
rf.end = rf.ptr + PyBytes_GET_SIZE(data);
}
else if (PyBytes_Check(data)) {
rf.ptr = PyBytes_AS_STRING(data);
rf.end = rf.ptr + PyBytes_GET_SIZE(data);
if (!PyBytes_Check(data)) {
PyErr_Format(PyExc_TypeError,
"f.read() returned not bytes but %.100s",
data->ob_type->tp_name);
result = NULL;
}
else {
PyErr_Format(PyExc_TypeError,
"f.read() returned neither string "
"nor bytes but %.100s",
data->ob_type->tp_name);
Py_DECREF(data);
return NULL;
rf.strings = PyList_New(0);
rf.depth = 0;
rf.fp = NULL;
rf.readable = f;
result = read_object(&rf);
Py_DECREF(rf.strings);
}
rf.strings = PyList_New(0);
rf.depth = 0;
result = read_object(&rf);
Py_DECREF(rf.strings);
Py_DECREF(data);
return result;
}
@ -1296,6 +1390,7 @@ marshal_loads(PyObject *self, PyObject *args)
s = p.buf;
n = p.len;
rf.fp = NULL;
rf.readable = NULL;
rf.ptr = s;
rf.end = s + n;
rf.strings = PyList_New(0);