On 23/02/2021 15:51, Neil Roberts wrote:
These two patches fix a problem with the madvise purging code for the
shmem helpers where the mmaping for a purged buffer wouldn't get
invalidated correctly. This presumably ends up as a security hole
where the mapping can be accessed from user-space to read and write
random pages from other buffers. This is currently affecting Panfrost.
The second patch is a v2 from a patch that was sent standalone.
There is a WIP IGT test for Panfrost which demonstrates the bug here:
https://gitlab.freedesktop.org/nroberts/igt-gpu-tools/-/commits/panfrost-purgemap/
Neil Roberts (2):
drm/shmem-helper: Check for purged buffers in fault handler
drm/shmem-helper: Don't remove the offset in vm_area_struct pgoff
drivers/gpu/drm/drm_gem_shmem_helper.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
Pushed to drm-misc-fixes
Thanks,
Steve
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