Re: [PATCH] selftests: Open /dev/udmabuf O_RDONLY
From: Jakub Kicinski <kuba@kernel.org>
Date: 2026-06-27 01:09:43
Also in:
bpf, linux-kselftest, lkml
On Thu, 25 Jun 2026 11:15:55 -0700 T.J. Mercier wrote:
Write permissions on the /dev/udmabuf device file are not required to issue ioctls and allocate udmabufs. Applications should be opening this file as O_RDONLY. The BPF dmabuf_iter selftest already does this. [1] Remove the write access mode from the drivers/dma-buf/udmabuf.c and drivers/net/hw/ncdevmem.c selftests.
You need to explain "why", too. Why change it if it clearly worked for everyone running this test until now. -- pw-bot: cr