[PATCH 4.9 07/31] drm: set FMODE_UNSIGNED_OFFSET for drm files
- Date: Tue, 12 Jun 2018 18:46:10 +0200
- From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
- Subject: [PATCH 4.9 07/31] drm: set FMODE_UNSIGNED_OFFSET for drm files
4.9-stable review patch. If anyone has any objections, please let me know.
From: Dave Airlie <airlied@xxxxxxxxxx>
commit 76ef6b28ea4f81c3d511866a9b31392caa833126 upstream.
Since we have the ttm and gem vma managers using a subset
of the file address space for objects, and these start at
0x100000000 they will overflow the new mmap checks.
I've checked all the mmap routines I could see for any
bad behaviour but overall most people use GEM/TTM VMA
managers even the legacy drivers have a hashtable.
Reported-and-Tested-by: Arthur Marsh (amarsh04 on #radeon)
Fixes: be83bbf8068 (mmap: introduce sane default mmap limits)
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/gpu/drm/drm_fops.c | 1 +
1 file changed, 1 insertion(+)
@@ -198,6 +198,7 @@ static int drm_open_helper(struct file *
filp->private_data = priv;
+ filp->f_mode |= FMODE_UNSIGNED_OFFSET;
priv->filp = filp;
priv->pid = get_pid(task_pid(current));
priv->minor = minor;