Re: Hi, Needs suggestions for finding and fixing stack/memory corruption when calling a function

Fawad Lateef wrote:

> For now I added two more temporary arguments between 1st and 2nd
> arguments and the required arguments getting correct values thats
> why I am assuming that by adding temporary variables we moved the
> memory corruption from real arguments into temporary arguments. 
> After adding these arguments my function is behaving correctly so
> for now this is a work-around _but_ I want to figure-out its proper
> fix (as the same sort of issue we faced in our cgi based web-pages
> code some weeks earlier).
> 
> Hence I needs suggestion that is this really a memory corruption or
> some compiler issues ? If its a compiler issue then its not a big
> problem but if its memory corruption issue then we have to _fix_ it
> asap.

Check the assembler output ("gcc -S ...").

Personally, I'd be more inclined to suspect register corruption. Are
you calling a library function which use a different ABI? E.g. if your
code is compiled for an ABI where certain registers are preserved but
calling a function using an ABI which doesn't preserver those
registers, then you'll have problems.

-- 
Glynn Clements <[email protected]>