linux-kernel - [10/80] drm/ttm: request zeroed system memory pages for new TT buffer objects

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Message-Id: <20111207160823.448487260@clark.kroah.org>
Date:	Wed, 07 Dec 2011 08:06:30 -0800
From:	Greg KH <gregkh@...e.de>
To:	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Cc:	<torvalds@...ux-foundation.org>, <akpm@...ux-foundation.org>,
	<alan@...rguk.ukuu.org.uk>, Ben Skeggs <bskeggs@...hat.com>,
	Dave Airlie <airlied@...hat.com>
Subject: [10/80] drm/ttm: request zeroed system memory pages for new TT buffer objects

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Skeggs <bskeggs@...hat.com>

commit ff02b13f6867af72682d7a9bb9bd705f9af2bab0 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@...il.com>
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Tested-by: Marcin Slusarz <marcin.slusarz@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/ttm/ttm_bo.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -394,7 +394,8 @@ static int ttm_bo_handle_move_mem(struct
 
 	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;
 		}


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