On Thu, Nov 19, 2020 at 12:46 AM Mel Gorman wrote:
>
> And not start thinking it as a security hardening option.
It's probably the reverse of a hardening option, since it will cause
mapping of stuff in known and controllable virtual addresses.
Although any kmap'able page is likely to already be
On Wed, Nov 18, 2020 at 01:13:57PM -0800, Linus Torvalds wrote:
> On Wed, Nov 18, 2020 at 12:58 PM Thomas Gleixner wrote:
> >
> > Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP which forces the temporary
> > mapping even for lowmem pages. This needs to be a seperate config switch
> > because this only
On Wed, Nov 18, 2020 at 12:58 PM Thomas Gleixner wrote:
>
> Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP which forces the temporary
> mapping even for lowmem pages. This needs to be a seperate config switch
> because this only works on architectures which do not have cache aliasing
> problems.
Very
CONFIG_DEBUG_KMAP_LOCAL, which is selected by CONFIG_DEBUG_HIGHMEM is only
providing guard pages, but does not provide a mechanism to enforce the
usage of the kmap_local() infrastructure.
Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP which forces the temporary
mapping even for lowmem pages. This
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