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- Subject: Re: Strange intermittent LuaJIT errors (likely my fault)
- From: Jay Carlson <nop@...>
- Date: Thu, 3 May 2012 23:39:05 -0400
On May 3, 2012, at 9:42 AM, Mike Pall wrote:
> Alexander Gladysh wrote:
>> I've got the same error on each run (guess I'm lucky today). With ASLR
>> on, errors are different, and majority of run do not fail.
>
> Well, then it should be much easier to reduce the test case. Also,
> if ASLR is off, AFAIR you'll get exactly the same memory layout as
> long as all binaries and libraries stay the same.
One fun chunk of debugging randomness, literally, is the cookie used for stack-smashing checks.
I was trying to figure out how to get at any bit of Linux kernel-provided randomness for hash seeding. I couldn't figure out how to express it using public header files, even though it's just sitting there in TLS at %fs:40...on x86_64. And if you're going to asm, you might as well just grab it off the stack.
Jay
