Re: [PATCH] asm-generic: uaccess: fix up local access_ok() usage

[Arnd Bergmann]

On Sunday 14 June 2009, Mike Frysinger wrote:
> in the Blackfin implementation, a protection violation is an
> exception, exceptions cannot be nested, there is no prioritization
> between exceptions, and a double exception is (hardware)
> unrecoverable.  so we need to catch pointers given to us from
> userspace.  if the kernel attempted to utilize that bad pointer, that
> is an exception in supervisor mode which is (software) unrecoverable
> -- our exception handler detects this and forces the system to panic.

Ok, I see. In that case it's obviously better to to include your patch 3/4.

	Arnd <><
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/