void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset)
{
void *p;
log("mmap for %p of length %zu prot %d flags %d fd %d offset %lld\n",
addr, length, prot, flags, fd, offset);
if (libc_mmap == NULL)
SAVE_LIBC_FUNC(libc_mmap, "mmap");
p = libc_mmap(addr, length, prot, flags, fd, offset);
return p;
}
void *mmap (void *__addr, size_t __len, int __prot, int __flags, int __fd, __off_t __offset)
{
static void* (*libc_mmap)
(void *__addr, size_t __len, int __prot, int __flags, int __fd, __off_t __offset) = NULL;
void *handle;
void* mmap_buffer;
char *error;
if (!libc_mmap) {
handle = dlopen("/lib/libc.so.6",
RTLD_LAZY);
if (!handle) {
fputs(dlerror(), stderr);
exit(1);
}
libc_mmap = dlsym(handle, "mmap");
if ((error = dlerror()) != NULL) {
fprintf(stderr, "%s\n", error);
exit(1);
}
}
// custom implementation
printf("AR.Pwn hooked mmap(%d, %d, %d, %d, %d, %d)\n", __addr, __len, __prot, __flags, __fd, __offset);
mmap_buffer = libc_mmap(__addr, __len, __prot, __flags, __fd, __offset);
printf("AR.Pwn mmap() returned %d\n", mmap_buffer);
if(hook_handle_video0 != -1 && __fd == hook_handle_video0)
{
int index;
int found = 0;
for(index = 0; index < 8; index++)
{
if(__offset == hook_buffer_offsets_video0[index])
{
found = 1;
break;
}
}
if(found)
{
printf("AR.Pwn Detected mmap of video0 index %d; saving buffer.\n", index);
hook_buffers_video0[index] = mmap_buffer;
}
}
else if(hook_handle_video1 != -1 && __fd == hook_handle_video1)
{
int index;
int found = 0;
for(index = 0; index < 8; index++)
{
if(__offset == hook_buffer_offsets_video1[index])
{
found = 1;
break;
}
}
if(found)
{
printf("AR.Pwn Detected mmap of video1 index %d; saving buffer.\n", index);
hook_buffers_video1[index] = mmap_buffer;
}
}
return mmap_buffer;
}