New submission from Emin Ghuliev:
I'm trying use a pointer on python script but when executing the following code
getting error. (Segmentation fault)
dmr@debian:~$ python test.py
Segmentation fault
self.mem = c_char_p(mem)
pointer(self.binning())[0] = 0x41414141
output:
[----------------------------------registers-----------------------------------]
EAX: 0x0
EBX: 0xb7aee000 --> 0x21e4c
ECX: 0x1
EDX: 0x41414141 ('AAAA')
ESI: 0x41414141 ('AAAA')
EDI: 0x41414141 ('AAAA')
EBP: 0xb7b0eb3c --> 0xc ('\x0c')
ESP: 0xbfffeb74 --> 0x0
EIP: 0xb7dfc4b6 (<__strlen_sse2_bsf+22>: movdqu xmm1,XMMWORD PTR [edi])
EFLAGS: 0x10287 (CARRY PARITY adjust zero SIGN trap INTERRUPT direction
overflow)
[-------------------------------------code-------------------------------------]
0xb7dfc4ad <__strlen_sse2_bsf+13>: pxor xmm0,xmm0
0xb7dfc4b1 <__strlen_sse2_bsf+17>: cmp ecx,0x30
0xb7dfc4b4 <__strlen_sse2_bsf+20>: ja 0xb7dfc4cd <__strlen_sse2_bsf+45>
=> 0xb7dfc4b6 <__strlen_sse2_bsf+22>: movdqu xmm1,XMMWORD PTR [edi]
0xb7dfc4ba <__strlen_sse2_bsf+26>: pcmpeqb xmm0,xmm1
0xb7dfc4be <__strlen_sse2_bsf+30>: pmovmskb edx,xmm0
0xb7dfc4c2 <__strlen_sse2_bsf+34>: test edx,edx
0xb7dfc4c4 <__strlen_sse2_bsf+36>: jne 0xb7dfc539
<__strlen_sse2_bsf+153>
[------------------------------------stack-------------------------------------]
BUG on ctypes module
.//source/cfield.c:1328
static PyObject *
z_get(void *ptr, unsigned size)
{
/* XXX What about invalid pointers ??? */
if (*(void **)ptr) {
#if defined(MS_WIN32) && !defined(_WIN32_WCE)
if (IsBadStringPtrA(*(char **)ptr, -1)) {
PyErr_Format(PyExc_ValueError,
"invalid string pointer %p",
*(char **)ptr);
return NULL;
}
#endif
return PyString_FromString(*(char **)ptr); < === passing
pointer as argument
} else {
Py_INCREF(Py_None);
return Py_None;
}
}
./Objects/stringobject.c:
PyObject *
PyString_FromString(const char *str = this value assigned to 0x41414141 address)
{
register size_t size;
register PyStringObject *op;
assert(str != NULL);
size = strlen(str); <==== argument address 0x41414141
----------
files: alloc.py
messages: 262077
nosy: Emin Ghuliev
priority: normal
severity: normal
status: open
title: Segfault on Pointer operation
Added file: http://bugs.python.org/file42224/alloc.py
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26595>
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