No. Electric Fence is designed to catch programming errors, such as
attempting to access memory which was not 'malloc'ed. I have traced this
down extensively a couple of months ago, and found that it does indeed
appear to overrun what it malloced.

I have two even simpler test cases for you:

int main(void){
    char *ptr=NULL;
    free(ptr);
}

and

int main(void){
    char *ptr = (char *)malloc(100);
}        

Both of these work fine (or at least *appear* to work fine) without Electric
Fence.

In normal operation, if I am correct, the ld.so code is just silently
overwriting some other data. 

If this were the case, wouldn't you expect ridiculous levels of instability?

-Hollis


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