Howard Chu wrote:
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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)