Valgrind 缺失错误 [英] Valgrind missing error
问题描述
(原帖在这里)
考虑以下明显有缺陷的程序:
Consider the following clearly buggy program:
#include <string.h>
int main()
{
char string1[10] = "123456789";
char *string2 = "123456789";
strcat(string1, string2);
}
并假设编译它:
gcc program.c -ggdb
并在其上运行 valgrind:
and run valgrind on it:
valgrind --track-origins=yes --leak-check=yes --tool=memcheck --read-var-info=yes ./a.out
在结果中,没有显示错误:
In the result, no error is shown:
==29739== Memcheck, a memory error detector
==29739== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
==29739== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
==29739== Command: ./a.out
==29739==
==29739==
==29739== HEAP SUMMARY:
==29739== in use at exit: 0 bytes in 0 blocks
==29739== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==29739==
==29739== All heap blocks were freed -- no leaks are possible
==29739==
==29739== For counts of detected and suppressed errors, rerun with: -v
==29739== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 2 from 2)
我错过了什么?
推荐答案
它没有报告任何错误,因为您使用的是 memcheck
,它不执行对全局或堆栈数组的检查,它只执行堆数组的边界检查和释放后使用检查.所以在这种情况下,你可以使用 valgrind SGCheck 来检查堆栈数组:
It did not report anything wrong because you were using memcheck
, which does not perform check on global or stack arrays, it only perform bounds checks and use-after-free checks for heap arrays. So in this case, you can use valgrind SGCheck to check stack arrays:
valgrind --tool=exp-sgcheck ./a.out
它确实为我报告了错误.
It indeed report the error for me.
有关更多信息,请参阅 sgcheck 文档:
For more information, refer the sgcheck docs:
http://valgrind.org/docs/manual/sg-manual.html
添加日志:
$ valgrind --tool=exp-sgcheck ./a.out
==10485== exp-sgcheck, a stack and global array overrun detector
==10485== NOTE: This is an Experimental-Class Valgrind Tool
==10485== Copyright (C) 2003-2015, and GNU GPL'd, by OpenWorks Ltd et al.
==10485== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==10485== Command: ./a.out
==10485==
==10485== Invalid read of size 1
==10485== at 0x4C2A374: strlen (h_intercepts.c:131)
==10485== by 0x4E9DD5B: puts (in /usr/lib64/libc-2.22.so)
==10485== by 0x4005C8: main (v.c:11)
==10485== Address 0xfff00042a expected vs actual:
==10485== Expected: stack array "string1" of size 10 in frame 2 back from here
==10485== Actual: unknown
==10485== Actual: is 0 after Expected
==10485==
==10485== Invalid read of size 1
==10485== at 0x4EA9BA2: _IO_default_xsputn (in /usr/lib64/libc-2.22.so)
==10485== by 0x4EA7816: _IO_file_xsputn@@GLIBC_2.2.5 (in /usr/lib64/libc-2.22.so)
==10485== by 0x4E9DDF7: puts (in /usr/lib64/libc-2.22.so)
==10485== by 0x4005C8: main (v.c:11)
==10485== Address 0xfff00042a expected vs actual:
==10485== Expected: stack array "string1" of size 10 in frame 3 back from here
==10485== Actual: unknown
==10485== Actual: is 0 after Expected
==10485==
123456789123456789
==10485==
==10485== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
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