26 Feb
2019
26 Feb
'19
2:39 p.m.
On Sat, Feb 23, 2019 at 12:06 AM Dave Hansen dave.hansen@intel.com wrote:
On 2/22/19 4:53 AM, Andrey Konovalov wrote:
userfaultfd_register() and userfaultfd_unregister() use provided user pointers for vma lookups, which can only by done with untagged pointers.
So, we have to patch all these sites before the tagged values get to the point of hitting the vma lookup functions. Dumb question: Why don't we just patch the vma lookup functions themselves instead of all of these callers?
That might be a working approach as well. We'll still need to fix up places where the vma fields are accessed directly. Catalin, what do you think?