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authorDave Airlie <airlied@redhat.com>2018-05-15 13:38:15 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-06-11 22:49:22 +0200
commit2abd4c3ed20df4609c28cefa4df36b3dad9dfed7 (patch)
parent3fe4b0cf93833af2ef497784bdfb2a4eecaabb6e (diff)
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: Dave Airlie <airlied@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index b3c6e997ccdb..03244b3c985d 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -212,6 +212,7 @@ 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->pid = get_pid(task_pid(current));
priv->minor = minor;