Messages in this thread | | | Date | Tue, 21 Apr 2015 12:17:49 +0200 | Subject | Re: [GIT PULL] kdbus for 4.1-rc1 | From | David Herrmann <> |
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Hi
On Tue, Apr 21, 2015 at 11:35 AM, One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> wrote: >> On top of that, I think that someone into resource management needs to >> seriously consider whether having a broadcast send do get_user_pages >> or the equivalent on pages supplied by untrusted recipients (plural!) >> is a good idea. > > Oh but its so much fun if you pass pages belonging to a device driver, or > pass bits of a GEM object thereby keeping entire graphics textures > referenced 8)
We do not use GUP, nor do we pass around pinned pages. All we use is __vfs_read() / __vfs_write() on shmem. Whether generic_file_write() / copy_from_user() internally relies on GUP or not, is an orthogonal issue that does not belong here.
Thanks David
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