Re: [PATCH] zsmalloc: calling zs_map_object() from irq is a bug

[Sergey Senozhatsky]

On (09/20/17 15:47), Minchan Kim wrote:
> On Wed, Sep 20, 2017 at 03:39:41PM +0900, Sergey Senozhatsky wrote:
> > Use BUG_ON(in_interrupt()) in zs_map_object(). Calling this
> > function from IRQ is a bug, because we use per-CPU mappings
> > and interrupt may corrupt those buffers.
> > 
> > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
> 
> IMHO, corruption the buffer would be not enough to be a BUG_ON
> which stop the system fully so user loses any chances to shut
> down smooth/hunt it down.
> 
> More serious thing of our case is that it can leak other user's
> data by overwriting, which is more concern I am thinking now.
> 
> So,
> 
> Acked-by: Minchan Kim <minchan@xxxxxxxxxx>

thanks.

	-ss