Buffer overwrite in libstdc++-v3 test 21_strings/c_strings.c

Greg Hosler hosler@lugs.org.sg
Mon Sep 24 07:20:00 GMT 2001


On 24-Sep-2001 Hans-Peter Nilsson wrote:
> Is this some C++ gotcha or is there an obvious buffer-overwrite
> here?  The CRIS gcc port and the simulator dump says the buffer
> is overwritten, but there's no absolute truth in that.
> 
>  ...
>   const char* ccarray1 = "san francisco roof garden inspectors";
>   const char* ccarray2 = "san francisco sunny-day park inspectors";
>   char carray[30];
>   std::strcpy(carray, ccarray1);
>  ...
> 
> Will trade patch for clue.

how do you fit 37 characters (i.e. strlen(ccarray1) + 1 for the null)
into 30 char buffer (size of carray), without overflowing it ?

-G

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| Greg Hosler                                   hosler@lugs.org.sg    |
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