[Bug 194579] New: AMDGPU: Possible size overflow detected by PaX in ttm_bo_handle_move_mem (drivers/gpu/drm/ttm/ttm_bo.c:388)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=194579

            Bug ID: 194579
           Summary: AMDGPU: Possible size overflow detected by PaX in
                    ttm_bo_handle_move_mem
                    (drivers/gpu/drm/ttm/ttm_bo.c:388)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.9.9
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: me at foxxx0.de
        Regression: No

While trying out the experimental amdgpu support for Southern Islands radeon
cards, I stumpled upon this issue due to using the grsec patchset.

It seems there is a size overflow:

kernel: PAX: size overflow detected in function ttm_bo_handle_move_mem
drivers/gpu/drm/ttm/ttm_bo.c:388 cicus.459_185 max, count: 5, decl: offset;
num: 0; context: ttm_buffer_object;


After addings a debug printk():

kernel: PAX start:7fffffffffffffff type:1 offset:80000000


Would be great if someone could provide some insight and confirm that it is
undesired behaviour.


Best,
Thore

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