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MPI和变量覆盖?

libcrypto mpi openssl c

Dimitrios Desyllas · 技术社区 · 7 年前

我尝试运行一个分布式应用程序,其中用于计算 burmester desmedt 密钥协商。

执行此操作的代码如下:

#include "mpi.h"
#include <stdio.h>

// Openssl
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>

// Custom
#include "message.h"
#include "dh.h"

void cleanup(DH *secret);

void cleanup(DH *secret) {
  EVP_cleanup();
  CRYPTO_cleanup_all_ex_data();
  OPENSSL_free(secret);
  ERR_free_strings();
}

int main(int argc, char *argv[]) {
  int rank, size;


  MPI_Init( &argc, &argv );
  MPI_Comm_rank( MPI_COMM_WORLD, &rank );
  MPI_Comm_size( MPI_COMM_WORLD, &size );

  /* Load the human readable error strings for libcrypto */
  ERR_load_crypto_strings();
  /* Load all digest and cipher algorithms */
  OpenSSL_add_all_algorithms();
  /* Load config file, and other important initialisation */
  OPENSSL_config(NULL);

  DH *secret;

  printf("RANK %d, Generating Diffie Hellman Keys\n", rank);
  fflush(stdout);
  if(-1 == generateKeys(secret)) {
    cleanup(secret);
    fprintf(stderr, "RANK %d, Failed to intialize key\n",rank);
    fflush(stderr);
    return -1;
  }

  printf("RANK %d, Keys generated\n",rank);
  fflush(stdout);

  // Set up Barrier for cpommunications
  MPI_Barrier(MPI_COMM_WORLD);

  printf("RANK %d, Publishing Keys\n", rank);
  fflush(stdout);

  if(secret == NULL) {
    cleanup(secret);
    fprintf(stderr, "RANK %d, Error on Generating the Diffie Hellman\n",rank);
    fflush(stderr);
    return -1;
  }

  if(MPIbcastBigNum(secret->pub_key, rank, "Publishing Public Key") == -1){
   cleanup(secret);
   return -1;
  }

  /*Cleanup */
  cleanup(secret);
  MPI_Finalize();
  return 0;
}

还有初始化dh和消息传递的助手方法(为了节省空间,我通过链接发布代码):

Diffie Hellman: https://github.com/pc-magas/burmester-desmedt/blob/master/dh.c
消息传递: https://github.com/pc-magas/burmester-desmedt/blob/master/message.c

我也通过这个编译它 Makefile . 所以我想知道为什么我下面的执行会变成segfault?

mpirun -np 3 ./builds/main
RANK 1, Generating Diffie Hellman Keys
RANK 2, Generating Diffie Hellman Keys
RANK 0, Generating Diffie Hellman Keys
RANK 1, Keys generated
RANK 2, Keys generated
RANK 0, Keys generated
RANK 2, Publishing Keys
[pcmagas-System-Product-Name:19304] *** Process received signal ***
[pcmagas-System-Product-Name:19304] Signal: Segmentation fault (11)
[pcmagas-System-Product-Name:19304] Signal code:  (128)
[pcmagas-System-Product-Name:19304] Failing at address: (nil)
[pcmagas-System-Product-Name:19304] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f485819c390]
[pcmagas-System-Product-Name:19304] [ 1] /lib/x86_64-linux-gnu/libcrypto.so.1.0.0(BN_num_bits+0x1d)[0x7f485873acfd]
[pcmagas-System-Product-Name:19304] [ 2] ./builds/main[0x401461]
[pcmagas-System-Product-Name:19304] [ 3] ./builds/main[0x40127b]
[pcmagas-System-Product-Name:19304] [ 4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f4857de1830]
[pcmagas-System-Product-Name:19304] [ 5] ./builds/main[0x400ff9]
[pcmagas-System-Product-Name:19304] *** End of error message ***
RANK 1, Publishing Keys
[pcmagas-System-Product-Name:19303] *** Process received signal ***
[pcmagas-System-Product-Name:19303] Signal: Segmentation fault (11)
[pcmagas-System-Product-Name:19303] Signal code:  (128)
[pcmagas-System-Product-Name:19303] Failing at address: (nil)
[pcmagas-System-Product-Name:19303] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7f2e56b90390]
[pcmagas-System-Product-Name:19303] [ 1] /lib/x86_64-linux-gnu/libcrypto.so.1.0.0(BN_num_bits+0x1d)[0x7f2e5712ecfd]
[pcmagas-System-Product-Name:19303] [ 2] ./builds/main[0x401461]
[pcmagas-System-Product-Name:19303] [ 3] ./builds/main[0x40127b]
[pcmagas-System-Product-Name:19303] [ 4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7f2e567d5830]
[pcmagas-System-Product-Name:19303] [ 5] ./builds/main[0x400ff9]
[pcmagas-System-Product-Name:19303] *** End of error message ***
RANK 0, Publishing Keys
[pcmagas-System-Product-Name:19302] *** Process received signal ***
[pcmagas-System-Product-Name:19302] Signal: Segmentation fault (11)
[pcmagas-System-Product-Name:19302] Signal code:  (128)
[pcmagas-System-Product-Name:19302] Failing at address: (nil)
[pcmagas-System-Product-Name:19302] [ 0] /lib/x86_64-linux-gnu/libpthread.so.0(+0x11390)[0x7fd967a55390]
[pcmagas-System-Product-Name:19302] [ 1] /lib/x86_64-linux-gnu/libcrypto.so.1.0.0(BN_num_bits+0x1d)[0x7fd967ff3cfd]
[pcmagas-System-Product-Name:19302] [ 2] ./builds/main[0x401461]
[pcmagas-System-Product-Name:19302] [ 3] ./builds/main[0x40127b]
[pcmagas-System-Product-Name:19302] [ 4] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0)[0x7fd96769a830]
[pcmagas-System-Product-Name:19302] [ 5] ./builds/main[0x400ff9]
[pcmagas-System-Product-Name:19302] *** End of error message ***
--------------------------------------------------------------------------
mpirun noticed that process rank 2 with PID 19304 on node pcmagas-System-Product-Name exited on signal 11 (Segmentation fault).
--------------------------------------------------------------------------
Makefile:16: recipe for target 'run' failed
make: *** [run] Error 139

是 DH 对象以某种方式被覆盖(正如我所知,OpenSSL不是线程和进程安全的,我试图通过单独的进程运行它)。

1 回复 | 直到 7 年前

Dimitrios Desyllas 7 年前

有时是创造 DH 对象位于任何函数的外部(理想情况下位于主函数上)。

在您的实现中,在以下函数中创建 dh.c 文件:

int generateKeys(DH *encryptionInfo) {
 int codes;

 if(NULL == (encryptionInfo = DH_new())) return -1;
 if(1 != DH_generate_parameters_ex(encryptionInfo, 2048, DH_GENERATOR_2, NULL)) return -1;
 if(1 != DH_check(encryptionInfo, &codes)) return -1;
 if(codes != 0) return -1;
 if(1 != DH_generate_key(encryptionInfo)) return -1;

 return 0;
}

所以我可能会 encryptionInfo 因此,我建议将以下代码移向主代码:

 if(NULL == (encryptionInfo = DH_new())) return -1;