VPP添加Address Sanitizer内存检测

原文地址：https://www.cnblogs.com/liqinglucky/p/address-sanitizer-in-vpp.html

在VPP的源码CMakeLists.txt中已经有address sanitizer的编译参数只是默认是OFF的。只要改为ON就可以在VPP代码启用内存检测功能。

一 添加编译参数

改动很简单，只需在VPP的CMakeLists.txt中使能address sanitizer编译参数

在src/CMakeLists.txt加上编译参数

option(VPP_ENABLE_SANITIZE_ADDR "Enable Address Sanitizer" ON)

如果没有生效就clean编译。

为了查看检测效果可以加些测试代码

diff --git a/src/vpp/vnet/main.c b/src/vpp/vnet/main.c
index 723eaa756..e9cef5e76 100644
--- a/src/vpp/vnet/main.c
+++ b/src/vpp/vnet/main.c
@@ -162,8 +162,7 @@ main (int argc, char *argv[])
fp = fopen (argv[2], "r");
if (fp == NULL)
{
+ int aa[10]={0};
+ fprintf (stderr, "open configuration file '%s' failed a11:%d\n",argv[2],aa[11]);
- fprintf (stderr, "open configuration file '%s' failed\n", argv[2]);
  return 1;
}
argv_ = calloc (1, sizeof (char *));

然后编译。

二 测试内存检测功能

如果运行提示没有libasan5依赖就安装依赖库

apt-get install libasan5

测试日志如下：

=================================================================
==1==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fffe4e923fc at pc 0x55c6e52e5d08 bp 0x7fffe4e921c0 sp 0x7fffe4e921b0
READ of size 4 at 0x7fffe4e923fc thread T0
    #0 0x55c6e52e5d07 in main /vpp/src/vpp/vnet/main.c:166
    #1 0x7f096b4b9082 in __libc_start_main ../csu/libc-start.c:308
    #2 0x55c6e52e366d in _start (/bin/vpp+0x1a66d)

Address 0x7fffe4e923fc is located in stack of thread T0 at offset 380 in frame
    #0 0x55c6e52e5727 in main /vpp/src/vpp/vnet/main.c:105

  This frame has 10 object(s):
    [48, 52) 'main_heap_log2_page_sz' (line 111)
    [64, 68) 'default_log2_hugepage_sz' (line 112)
    [80, 88) 'main_heap_size' (line 108)
    [112, 120) 's' (line 114)
    [144, 152) 'v' (line 114)
    [176, 216) 'input' (line 113)
    [256, 296) 'sub_input' (line 113)
    [336, 376) 'aa' (line 165) <== Memory access at offset 380 overflows this variable
    [416, 544) 'cpuset' (line 116)
    [576, 4672) 'inbuf' (line 156)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow /vpp/src/vpp/vnet/main.c:166 in main
Shadow bytes around the buggy address:
  0x10007c9ca420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007c9ca430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007c9ca440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007c9ca450: f1 f1 f1 f1 f1 f1 04 f2 00 00 00 f2 00 00 00 f2
  0x10007c9ca460: 00 00 00 f2 f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2
=>0x10007c9ca470: 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 00[f2]
  0x10007c9ca480: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007c9ca490: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00
  0x10007c9ca4a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007c9ca4b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x10007c9ca4c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==1==ABORTING
AddressSanitizer:DEADLYSIGNAL
AddressSanitizer: nested bug in the same thread, aborting.

同时也会产生corefile。VPP启用Address Sanitizer成功。