__malloc_hook functionality not working in Android
Multi tool use
0
I have created a native c++ binary mytest. I copied it to /data/local/tmp on a device running Android P. However, malloc hook functions are not getting called. The device is not rooted. I am using setenv to set the environment var. LIBC_HOOKS_ENABLE. Binary is built with ndk17 and sdk28.0.2.
The code is given below:
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
/* Prototypes for our hooks. */
static void my_init_hook(void);
static void *my_malloc_hook(size_t, const void *);
/* Variables to save original hooks. */
static void *(*old_malloc_hook) (size_t, const void *);
/* Override initializing hook from the C library. */
void (*__malloc_initialize_hook) (void) = my_init_hook;
static void my_init_hook(void)
{
printf("my_init_hook calledn");
old_malloc_hook = __malloc_hook;
__malloc_hook = my_malloc_hook;
}
static void *my_malloc_hook(size_t size, const void *caller)
{
void *result;
/* Restore all old hooks */
__malloc_hook = old_malloc_hook;
result = malloc(size);
printf("My hook is calledn");
/* Save underlying hooks */
old_malloc_hook = __malloc_hook;
/* Restore our own hooks */
__malloc_hook = my_malloc_hook;
return result;
}
int main(void) {
char *p;
int retVal = 0;
retVal = setenv("LIBC_HOOKS_ENABLE", "1", true);
if (retVal) {
printf("Setenv failed %dn", retVal);
} else {
printf("Setenv Donen");
char *name = getenv("LIBC_HOOKS_ENABLE");
printf("Getenv Value %sn", name);
}
p = (char *) malloc(100);
free(p);
return 0;
}
android malloc asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
add a comment |
0
I have created a native c++ binary mytest. I copied it to /data/local/tmp on a device running Android P. However, malloc hook functions are not getting called. The device is not rooted. I am using setenv to set the environment var. LIBC_HOOKS_ENABLE. Binary is built with ndk17 and sdk28.0.2.
The code is given below:
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
/* Prototypes for our hooks. */
static void my_init_hook(void);
static void *my_malloc_hook(size_t, const void *);
/* Variables to save original hooks. */
static void *(*old_malloc_hook) (size_t, const void *);
/* Override initializing hook from the C library. */
void (*__malloc_initialize_hook) (void) = my_init_hook;
static void my_init_hook(void)
{
printf("my_init_hook calledn");
old_malloc_hook = __malloc_hook;
__malloc_hook = my_malloc_hook;
}
static void *my_malloc_hook(size_t size, const void *caller)
{
void *result;
/* Restore all old hooks */
__malloc_hook = old_malloc_hook;
result = malloc(size);
printf("My hook is calledn");
/* Save underlying hooks */
old_malloc_hook = __malloc_hook;
/* Restore our own hooks */
__malloc_hook = my_malloc_hook;
return result;
}
int main(void) {
char *p;
int retVal = 0;
retVal = setenv("LIBC_HOOKS_ENABLE", "1", true);
if (retVal) {
printf("Setenv failed %dn", retVal);
} else {
printf("Setenv Donen");
char *name = getenv("LIBC_HOOKS_ENABLE");
printf("Getenv Value %sn", name);
}
p = (char *) malloc(100);
free(p);
return 0;
}
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
Try to update to Android API v28, c.f. my other answer
– evandrix
Feb 28 at 6:47
add a comment |
0
0
0
I have created a native c++ binary mytest. I copied it to /data/local/tmp on a device running Android P. However, malloc hook functions are not getting called. The device is not rooted. I am using setenv to set the environment var. LIBC_HOOKS_ENABLE. Binary is built with ndk17 and sdk28.0.2.
The code is given below:
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
/* Prototypes for our hooks. */
static void my_init_hook(void);
static void *my_malloc_hook(size_t, const void *);
/* Variables to save original hooks. */
static void *(*old_malloc_hook) (size_t, const void *);
/* Override initializing hook from the C library. */
void (*__malloc_initialize_hook) (void) = my_init_hook;
static void my_init_hook(void)
{
printf("my_init_hook calledn");
old_malloc_hook = __malloc_hook;
__malloc_hook = my_malloc_hook;
}
static void *my_malloc_hook(size_t size, const void *caller)
{
void *result;
/* Restore all old hooks */
__malloc_hook = old_malloc_hook;
result = malloc(size);
printf("My hook is calledn");
/* Save underlying hooks */
old_malloc_hook = __malloc_hook;
/* Restore our own hooks */
__malloc_hook = my_malloc_hook;
return result;
}
int main(void) {
char *p;
int retVal = 0;
retVal = setenv("LIBC_HOOKS_ENABLE", "1", true);
if (retVal) {
printf("Setenv failed %dn", retVal);
} else {
printf("Setenv Donen");
char *name = getenv("LIBC_HOOKS_ENABLE");
printf("Getenv Value %sn", name);
}
p = (char *) malloc(100);
free(p);
return 0;
}
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
I have created a native c++ binary mytest. I copied it to /data/local/tmp on a device running Android P. However, malloc hook functions are not getting called. The device is not rooted. I am using setenv to set the environment var. LIBC_HOOKS_ENABLE. Binary is built with ndk17 and sdk28.0.2.
The code is given below:
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
/* Prototypes for our hooks. */
static void my_init_hook(void);
static void *my_malloc_hook(size_t, const void *);
/* Variables to save original hooks. */
static void *(*old_malloc_hook) (size_t, const void *);
/* Override initializing hook from the C library. */
void (*__malloc_initialize_hook) (void) = my_init_hook;
static void my_init_hook(void)
{
printf("my_init_hook calledn");
old_malloc_hook = __malloc_hook;
__malloc_hook = my_malloc_hook;
}
static void *my_malloc_hook(size_t size, const void *caller)
{
void *result;
/* Restore all old hooks */
__malloc_hook = old_malloc_hook;
result = malloc(size);
printf("My hook is calledn");
/* Save underlying hooks */
old_malloc_hook = __malloc_hook;
/* Restore our own hooks */
__malloc_hook = my_malloc_hook;
return result;
}
int main(void) {
char *p;
int retVal = 0;
retVal = setenv("LIBC_HOOKS_ENABLE", "1", true);
if (retVal) {
printf("Setenv failed %dn", retVal);
} else {
printf("Setenv Donen");
char *name = getenv("LIBC_HOOKS_ENABLE");
printf("Getenv Value %sn", name);
}
p = (char *) malloc(100);
free(p);
return 0;
}
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
asked Nov 28 '18 at 5:06
Sachin MishraSachin Mishra
63
63
Try to update to Android API v28, c.f. my other answer
– evandrix
Feb 28 at 6:47
add a comment |
Try to update to Android API v28, c.f. my other answer
– evandrix
Feb 28 at 6:47
Try to update to Android API v28, c.f. my other answer
– evandrix
Feb 28 at 6:47
Try to update to Android API v28, c.f. my other answer
– evandrix
Feb 28 at 6:47
add a comment |
0
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Try to update to Android API v28, c.f. my other answer
– evandrix
Feb 28 at 6:47