Re: [BUG] completely bonkers use of set_need_resched + VM_FAULT_NOPAGE

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 09/13/2013 10:32 AM, Daniel Vetter wrote:
On Fri, Sep 13, 2013 at 10:23 AM, Thomas Hellstrom
<thellstrom@xxxxxxxxxx> wrote:
As previously mentioned, copy_from_user should return -EFAULT, since the
VMAs are marked with VM_IO. It should not recurse into fault(), so evil
user-space looses.
I haven't put a printk in the code to prove this, but gem mmap also
sets VM_IO in drm_gem_mmap_obj. And we can very much hit our own fault
handler and deadlock ....

If this is indeed true, I guess I need to accept the fact that my solution is bad.
(and worse I can't blame not having my morning coffee).

I'll take a deeper look.
/Thomas
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/intel-gfx




[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]
  Powered by Linux