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Commit 1a168225 authored by Dave Airlie's avatar Dave Airlie Committed by Greg Kroah-Hartman
Browse files

drm: set FMODE_UNSIGNED_OFFSET for drm files 



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: default avatarDave Airlie <airlied@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3bbdc2a4

drivers/gpu/drm/drm_fops.c

+1 −0
Original line number Diff line number Diff line
@@ -155,6 +155,7 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor) 
		return -ENOMEM;



	filp->private_data = priv;

	filp->f_mode |= FMODE_UNSIGNED_OFFSET;

	priv->filp = filp;

	priv->uid = current_euid();

	priv->pid = get_pid(task_pid(current));