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/* custom checking allocators a la Electric Fence */
#include "linuxmemchk.h"
#if HEAVY_MEM_CHECK
#undef NDEBUG
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define PAGESIZE 4096
#ifndef MALLOC_BIGBUFFER
# define MALLOC_BIGBUFFER PAGESIZE*16384
#endif
struct _alloc_s {
void* ptr;
int npages;
};
static void* _na_start = NULL;
static char* _na_cur;
static struct _alloc_s* _na_find(void* data)
{
int err;
long data1;
struct _alloc_s* s;
assert(_na_start+PAGESIZE <= data &&
data < _na_start+MALLOC_BIGBUFFER-PAGESIZE);
data1 = (long) data;
data1 &= ~(PAGESIZE-1);
data1 -= PAGESIZE;
err = mprotect((void*) data1, PAGESIZE, PROT_READ|PROT_WRITE);
assert(!err);
s = (struct _alloc_s*) data1;
assert(s->npages > 0);
return s;
}
DEFINEFN
void* memchk_ef_malloc(int size)
{
int err, npages = (size + PAGESIZE-1) / PAGESIZE + 1;
struct _alloc_s* s;
char* data;
if (_na_start == NULL)
{
_na_start = mmap(NULL, MALLOC_BIGBUFFER, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
assert(_na_start != MAP_FAILED);
_na_cur = (char*) _na_start;
}
s = (struct _alloc_s*) _na_cur;
_na_cur += npages * PAGESIZE;
if (_na_cur >= ((char*) _na_start) + MALLOC_BIGBUFFER)
{
fprintf(stderr, "Nothing wrong so far, but MALLOC_CHECK is running out\n of mmap'ed memory. Increase MALLOC_BIGBUFFER.\n");
assert(0);
}
err = mprotect(s, npages * PAGESIZE, PROT_READ|PROT_WRITE|PROT_EXEC);
assert(!err);
s->ptr = data = _na_cur - /*((size+3)&~3)*/ size;
s->npages = npages;
err = mprotect(s, PAGESIZE, PROT_NONE);
assert(!err);
return data;
}
DEFINEFN
void memchk_ef_free(void* data)
{
int err, npages;
struct _alloc_s* s;
if (data == NULL)
return;
s = _na_find(data);
assert(s->ptr == data);
npages = s->npages;
s->npages = 0;
err = mprotect(s, npages * PAGESIZE, PROT_NONE);
assert(!err);
//fprintf(stderr, "PyMem_FREE(%p): mprotect %p %x\n", data, s, npages*PAGESIZE);
}
DEFINEFN
void* memchk_ef_realloc(void* data, int nsize)
{
int size;
struct _alloc_s* s = _na_find(data);
void* ndata = PyMem_MALLOC(nsize);
assert(s->ptr == data);
size = ((char*)s) + s->npages * PAGESIZE - (char*)data;
memcpy(ndata, data, size<nsize ? size : nsize);
PyMem_FREE(data);
return ndata;
}
#endif /* LINUXMEMCHK */
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