drm/radeon: forbid mapping of userptr bo through radeon device file

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commit b5dcec693f upstream.

Allowing userptr bo which are basicly a list of page from some vma
(so either anonymous page or file backed page) would lead to serious
corruption of kernel structures and counters (because we overwrite
the page->mapping field when mapping buffer).

This will already block if the buffer was populated before anyone does
try to mmap it because then TTM_PAGE_FLAG_SG would be set in in the
ttm_tt flags. But that flag is check before ttm_tt_populate in the ttm
vm fault handler.

So to be safe just add a check to verify_access() callback.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jérôme Glisse 2016-04-19 09:07:50 -04:00 • committed by Greg Kroah-Hartman

parent 2ae4d40939

commit 7946284184

1 changed files with 2 additions and 0 deletions

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drivers/gpu/drm/radeon/radeon_ttm.c

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