[lkml]   [2020]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: [PATCH v4.19.x] make 'user_access_begin()' do 'access_ok()'
> Ok, but what does that mean for us?
> You need to say why you are sending a patch, otherwise we will guess wrong.

In drivers/gpu/drm/i915/i915_gem_execbuffer.c, ioctl functions does user_access_begin() without doing access_ok(Checks if a user space pointer is valid) first.
A local attacker can craft a malicious ioctl function call to overwrite arbitrary kernel memory, resulting in a Denial of Service or privilege escalation (CVE-2018-20669)

This patch makes sure that user_access_begin always does access_ok.
user_access_begin has been modified to do access_ok internally.


 \ /
  Last update: 2020-05-13 19:09    [W:0.087 / U:3.848 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site