Re: [PATCH] allow ptrace and /proc/PID/mem to read fixmap pages

[Linus Torvalds]

On Sat, 26 Apr 2003, Roland McGrath wrote:
> 
> This patch is i386-specific and should probably be done another way, but
> it's what I am using now.  It works and is well-tested. 

It looks to me like it will cause NULL pointer dereferences if the user 
asks for something that is inside a pmd isn't mapped.

Maybe that won't happen for the FIXADDR range, but this is just not 
acceptable. We don't do code without error handling in the kernel.

		Linus