Am Freitag, dem 19.03.2021 um 20:09 +0100 schrieb Daniel Vetter:
> On Mon, Mar 01, 2021 at 10:52:53AM +0100, Daniel Vetter wrote:
> > Nothing checks userptr.ro except this call to pup_fast, which means
> > there's nothing actually preventing userspace from writing to this.
> > Which means you can j
On Mon, Mar 01, 2021 at 10:52:53AM +0100, Daniel Vetter wrote:
> Nothing checks userptr.ro except this call to pup_fast, which means
> there's nothing actually preventing userspace from writing to this.
> Which means you can just read-only mmap any file you want, userptr it
> and then write to it w
On Mon, Mar 1, 2021 at 11:28 AM Lucas Stach wrote:
>
> Am Montag, dem 01.03.2021 um 10:52 +0100 schrieb Daniel Vetter:
> > Nothing checks userptr.ro except this call to pup_fast, which means
> > there's nothing actually preventing userspace from writing to this.
> > Which means you can just read-o
Am Montag, dem 01.03.2021 um 10:52 +0100 schrieb Daniel Vetter:
> Nothing checks userptr.ro except this call to pup_fast, which means
> there's nothing actually preventing userspace from writing to this.
> Which means you can just read-only mmap any file you want, userptr it
> and then write to it
Nothing checks userptr.ro except this call to pup_fast, which means
there's nothing actually preventing userspace from writing to this.
Which means you can just read-only mmap any file you want, userptr it
and then write to it with the gpu. Not good.
The right way to handle this is FOLL_WRITE | FO
