[erlang-bugs] R14B01: buffer overflow detected during compilation with -D_FORTIFY_SOURCE=2 (x86_64)

Kostis Sagonas <>
Wed Jan 12 10:50:12 CET 2011

Christian Faulhammer wrote:
> Hi,
> Nico Kruber <>:
>> Most distributions nowadays adds the -D_FORTIFY_SOURCE=2 flag during
>> package compilation. I tried updating my erlang package (openSUSE
>> 11.3, x86_64) from R14B to R14B01 and received the following error
>> (also see the attached build.log.fortsource2 - compressed due to its
>> file size):
>  This seems to be specific to 64bit arches as people could reproduce
> the problem with GCC 4.4.  PLD Linux offers a fix (so they say, I still
> need reports from our users) in
>  http://cvs.pld-linux.org/cgi-bin/cvsweb/packages/erlang/erlang-fortify.patch

 From the patch:

   -#  define FILENAME_COPY(To,From) strcpy(To,From)
   +#  define FILENAME_COPY(To,From) memcpy(To,From,strlen(From)+1)

and its comment:

   up to R14B01; replace strcpy with memcpy because fortify source
   won't allow to strcpy into too short array

it's not at all clear to me why this is a 64-bit specific issue.

It seems that this is (more of) a problem of fortify, which needs fixing 
here, not of Erlang/OTP.


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