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drm/ttm: request zeroed system memory pages for new TT buffer objects

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commit ff02b13f68 upstream.

Fixes an information leak to userspace, we were handing out un-zeroed pages
for any newly created TTM_PL_TT buffer.

Reported-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Tested-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ben Skeggs 2011-09-14 06:08:06 +10:00 committed by Greg Kroah-Hartman
parent 6d7f52a7e6
commit 8215014c1d
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/ttm/ttm_bo.c
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@ -394,7 +394,8 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
if (bo->ttm == NULL) {
ret = ttm_bo_add_ttm(bo, false);
bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
ret = ttm_bo_add_ttm(bo, zero);
if (ret)
goto out_err;
}