On Tue, Aug 11, 2026 at 1:41 PM T.J. Mercier <[email protected]> wrote: > > Write permissions on the /dev/dma_heap/* device files are not required > to issue ioctls and allocate dmabufs. Applications should be opening > these file as O_RDONLY. The BPF dmabuf_iter selftest already does > this. [1] > > Users are pointing to these selftests as examples of how use dmabuf, > and encountering permission errors on systems where write permissions > are not available on /dev/dma_heap/*. Apply the principle of least > privilege to selftests which open dmabuf heaps by removing the write > access mode and using O_RDONLY for the open() instead. > > The same is true for the vgem test using /dev/dri/card. > > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/testing/selftests/bpf/prog_tests/dmabuf_iter.c?h=v7.1#n49 > > Signed-off-by: T.J. Mercier <[email protected]>
Acked-by: John Stultz <[email protected]> thanks -john
