Re: (ITS#8294) slappasswd can use SHA256 for hash but not SHA384 or SHA512...segfault

[hyc@symas.com]

Howard Chu wrote:
> ktmdms@gmail.com wrote:
>> --089e0115ec1091312605232ac99f
>> Content-Type: text/plain; charset=UTF-8
>>
>> To add fuel to the fire, if I use pw-sha2 libraries that were built on a
>> 2.6 kernel (specifically 2.6.32-358.el6.x86_64) on the 3.18 machine I can
>> generate SHA512/384 hashed passwords with no issues.  What should I be
>> looking for between the two platforms that might cause the core?
>
> Strange that the kernel would make any difference - more likely it's your C
> compiler making the difference.

I may have misread your message. If the same binary works on a newer system, 
that tends to imply something weird in the runtime environment. Perhaps a 
problem with ASLR.

> I ran a test on one machine and got an abort in glibc saying there was a stack
> overrun. On a different machine I got no such error, and running on the
> problem system under valgrind produced no errors.
>
> On the machine that aborted, when I compiled with gcc -fstack-protector-all,
> the glibc abort disappeared as well. So, this hasn't helped me identify the
> problem yet. (gcc 4.8.4-2ubuntu1~14.04)
>


-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/