/*
american fuzzy lop++ - android shared memory compatibility layer
----------------------------------------------------------------
Originally written by Michal Zalewski
Now maintained by Marc Heuse <mh@mh-sec.de>,
Heiko Eißfeldt <heiko.eissfeldt@hexco.de> and
Andrea Fioraldi <andreafioraldi@gmail.com>
Copyright 2016, 2017 Google Inc. All rights reserved.
Copyright 2019-2020 AFLplusplus Project. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
http://www.apache.org/licenses/LICENSE-2.0
This header re-defines the shared memory routines used by AFL++
using the Andoid API.
*/
#ifndef _ANDROID_ASHMEM_H
#define _ANDROID_ASHMEM_H
#include <fcntl.h>
#include <linux/shm.h>
#include <linux/ashmem.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#if __ANDROID_API__ >= 26
#define shmat bionic_shmat
#define shmctl bionic_shmctl
#define shmdt bionic_shmdt
#define shmget bionic_shmget
#endif
#include <sys/shm.h>
#undef shmat
#undef shmctl
#undef shmdt
#undef shmget
#include <stdio.h>
#define ASHMEM_DEVICE "/dev/ashmem"
static inline int shmctl(int __shmid, int __cmd, struct shmid_ds *__buf) {
int ret = 0;
if (__cmd == IPC_RMID) {
int length = ioctl(__shmid, ASHMEM_GET_SIZE, NULL);
struct ashmem_pin pin = {0, (unsigned int)length};
ret = ioctl(__shmid, ASHMEM_UNPIN, &pin);
close(__shmid);
}
return ret;
}
static inline int shmget(key_t __key, size_t __size, int __shmflg) {
(void)__shmflg;
int fd, ret;
char ourkey[11];
fd = open(ASHMEM_DEVICE, O_RDWR);
if (fd < 0) return fd;
sprintf(ourkey, "%d", __key);
ret = ioctl(fd, ASHMEM_SET_NAME, ourkey);
if (ret < 0) goto error;
ret = ioctl(fd, ASHMEM_SET_SIZE, __size);
if (ret < 0) goto error;
return fd;
error:
close(fd);
return ret;
}
static inline void *shmat(int __shmid, const void *__shmaddr, int __shmflg) {
(void)__shmflg;
int size;
void *ptr;
size = ioctl(__shmid, ASHMEM_GET_SIZE, NULL);
if (size < 0) { return NULL; }
ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, __shmid, 0);
if (ptr == MAP_FAILED) { return NULL; }
return ptr;
}
#endif
