Re: copy_from_user() fixu

H. Peter Anvin (hpa@transmeta.com)
Tue, 25 Aug 1998 00:29:30 -0700 (PDT)

>
> Well, being serious here, I have a library that is bug-free, but I
> can't depend on application writers to sustain my level of
> perfection. So, so help these lesser beings, I trap EFAULT in my
> library and yield a more meaningful diagnostic than a mere EFAULT or
> SEGV.
>

Now you *really* convinced me that you're crazy.

Once again: if you're relying on EFAULT rather than SIGSEGV, your code
is broken, as you're relying on details of the libc/kernel interface.
I would argue that *IS* a bug in your "bug-free" library.

If you want to trap errors, you either have to sanitize the input, or
trap SIGSEGV.

-hpa

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