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Subjectcopy_to_user count seg-fault
I am working on a device driver for a 2.4.14 kernel.

In my standard read function I use copy_to_user(buff,&reloc,count);
buff is the buffer passed from the read function, reloc is a char, and
count is the size_t count paramenter from the read function.

as long as I pass it count it works fine, however if I replace count
with a constant 1 I get a seg fault.

if I set count=1 I get a seg fault.

and finally and weirdest of all, if I do an if(count==1) I get a seg
fault.

has anyone seen anything like this before, what could possibly be
causing this?


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