Re: Insertion of die_if_kernel in unaligned.c

[Ralf Baechle <ralf@oss.sgi.com>]

On Thu, May 03, 2001 at 12:39:20PM +0200, Carsten Langgaard wrote:

> In the latest version of arch/mips/kernel/unaligned.c, there has been
> inserted some calls to the die_if_kernel, which check if we are running
> in kernel mode and if so dies.
> I'm not so sure this is the right thing to do, the floating point
> emulator will in some cases generate an address error (e.g. if emulating
> a swc1 to an unaligned address). The result is that an user application
> can crash the kernel.

They're wrong and what's worse, I knew about them.  The unaligned from
kernelspace case can also be triggered from the network stack so this
leaves machines open to remote DoS.

  Ralf