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#include <string.h>
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include "vtv_malloc.h"
bool vtv_debug = false;
static void
handler(int sig, siginfo_t *si, void *unused)
{
printf("Got SIGSEGV at address: 0x%lx\n",
(long) si->si_addr);
exit(1);
}
int memchk(const void * s, int c, size_t n)
{
const char * p = (const char *)s;
for (; p < ((char *)s + n); p++)
if (*p != c)
return 1;
return 0;
}
int main()
{
char * ptr;
int size;
/* Set up handler for SIGSEGV. In this test case, we should never hit any SIGSEGV */
struct sigaction sa;
sa.sa_flags = SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = handler;
if (sigaction(SIGSEGV, &sa, NULL) == -1)
assert(0);
__vtv_malloc_init();
size = 10;
/* Verify simple allocation and deallocation */
__vtv_malloc_unprotect();
ptr = (char *)__vtv_malloc(size);
__vtv_malloc_protect();
__vtv_free(ptr);
/* Verify writable after unprotect */
__vtv_malloc_unprotect();
ptr = (char *)__vtv_malloc(size);
memset(ptr, 'a', size);
__vtv_malloc_protect();
__vtv_free(ptr);
/* verify readable after protect */
__vtv_malloc_unprotect();
ptr = (char *)__vtv_malloc(size);
memset(ptr, 'a', size);
__vtv_malloc_protect();
assert(ptr[size - 1] == 'a');
__vtv_free(ptr);
/* verify writable after protect, unprotect */
__vtv_malloc_unprotect();
ptr = (char *)__vtv_malloc(size);
memset(ptr, 'a', size);
__vtv_malloc_protect();
__vtv_malloc_unprotect();
memset(ptr, 'a', size);
assert(ptr[size - 1] == 'a');
__vtv_malloc_protect();
assert(ptr[size - 1] == 'a');
__vtv_free(ptr);
/* Allocate a bunch of small objects.
Make sure the alignment is correct.
Verify data has not been corrupted.
Try to modify the data to verify everything gets unprotected */
{
int s;
for (s = 3; s < 28; s += 3)
{
size = s;
{
int i;
#define ITERS 1000
char * ptrs[ITERS];
__vtv_malloc_unprotect();
for (i = 0; i < ITERS; i++)
{
ptr = (char *)__vtv_malloc(size);
assert(((long)ptr & VTV_ALIGNMENT_MASK) == 0);
memset(ptr, (i & 127), size);
assert(ptr[size - 1] == (i & 127));
ptrs[i] = ptr;
}
__vtv_malloc_protect();
__vtv_malloc_unprotect();
for (i = 0; i < ITERS; i++)
{
if (memchk(ptrs[i], i & 127, size) != 0)
assert(0);
memset(ptrs[i], (i + 1) & 127, size);
if (memchk(ptrs[i], (i + 1) & 127, size) != 0)
assert(0);
__vtv_free(ptrs[i]);
}
__vtv_malloc_protect();
}
}
}
/* Allocate a bunch of medium size objects.
Make sure the alignment is correct.
Verify data has not been corrupted.
Try to modify the data to verify everything gets unprotected */
{
int s;
for (s = 501; s < 2500; s += 91)
{
size = s;
{
int i;
#define ITERS2 100
char * ptrs[ITERS2];
__vtv_malloc_unprotect();
for (i = 0; i < ITERS2; i++)
{
ptr = (char *)__vtv_malloc(size);
assert(((long)ptr & VTV_ALIGNMENT_MASK) == 0);
memset(ptr, i & 127, size);
assert(ptr[size - 1] == i & 127);
ptrs[i] = ptr;
}
__vtv_malloc_protect();
__vtv_malloc_unprotect();
for (i = 0; i < ITERS2; i++)
{
if (memchk(ptrs[i], i & 127, size) != 0)
assert(0);
memset(ptrs[i], (i + 1) & 127, size);
if (memchk(ptrs[i], (i + 1) & 127, size) != 0)
assert(0);
__vtv_free(ptrs[i]);
}
__vtv_malloc_protect();
}
}
}
/* Allocate a bunch of medium size objects. Make sure the alignment is correct */
{
int s;
for (s = 3001; s < 15000; s += 307)
{
size = s;
{
int i;
#define ITERS3 50
char * ptrs[ITERS3];
__vtv_malloc_unprotect();
for (i = 0; i < ITERS3; i++)
{
ptr = (char *)__vtv_malloc(size);
assert(((long)ptr & VTV_ALIGNMENT_MASK) == 0);
memset(ptr, i & 127, size);
assert(ptr[size - 1] == i & 127);
ptrs[i] = ptr;
}
__vtv_malloc_protect();
__vtv_malloc_unprotect();
for (i = 0; i < ITERS3; i++)
{
if (memchk(ptrs[i], i & 127, size) != 0)
assert(0);
memset(ptrs[i], (i + 1) & 127, size);
if (memchk(ptrs[i], (i + 1) & 127, size) != 0)
assert(0);
__vtv_free(ptrs[i]);
}
__vtv_malloc_protect();
}
}
}
return 0;
}
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