Re: [PATCH] memory:bugxfix panic on cat or write /dev/kmem

[Michal Hocko]

On Sat 25-06-16 09:20:06, Chenjie (K) wrote:
> 
> 
> On 2016/6/23 20:42, Michal Hocko wrote:
> > On Fri 24-06-16 01:30:10, chenjie6@xxxxxxxxxx wrote:
> > > From: chenjie <chenjie6@xxxxxxxxxx>
> > > 
> > > cat /dev/kmem and echo > /dev/kmem will lead panic
> > 
> > Writing to /dev/kmem without being extremely careful is a disaster AFAIK
> > and even reading from the file can lead to unexpected results. Anyway
> > I am trying to understand what exactly you are trying to fix here. Why
> > writing to/reading from zero pfn should be any special wrt. any other
> > potentially dangerous addresses
> > 
> 
> cat /dev/mem not panic. cat /dev/kmem, just the user's operation for
> nothing.

I am sorry, but I do not follow. Could you be more specific please?
-- 
Michal Hocko
SUSE Labs