/linux/commits/Yu-Zhao/drm-amd-validate-user-pitch-alignment/20181222-153630
config: i386-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by >>):
On Thu, 20 Dec 2018 at 21:20, StDenis, Tom wrote:
>
> Sorry I didn't mean to be dismissive. It's just not a bug in umr though.
>
> On Fedora I can access those files as root just fine:
>
> tom@fx8:~$ sudo bash
> [sudo] password for tom:
> root@fx8:/home/tom# cd /sys/kernel/debug/dri/0
> root@fx8:
When creating frame buffer, userspace may request to attach to a
previously allocated GEM object that is smaller than what GPU
requires. Validation must be done to prevent out-of-bound DMA,
which could not only corrupt memory but also reveal sensitive data.
This fix is not done in a common code pa
Userspace may request pitch alignment that is not supported by GPU.
Some requests 32, but GPU ignores it and uses default 64 when cpp is
4. If GEM object is allocated based on the smaller alignment, GPU
DMA will go out of bound.
For GPU that does frame buffer compression, DMA writing out of bound
/linux/commits/Yu-Zhao/drm-amd-validate-user-pitch-alignment/20181222-153630
config: i386-randconfig-h1-12231406 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
All warnings (new ones prefixed by
