NVME_IOCTL_SUBMIT_IO access control

[Niklas Cassel]

Hello there,

How is the NVME_IOCTL_SUBMIT_IO access control supposed to work?

$ echo "hello" | nvme write /dev/nvme0n1 -s 0 -c 1 -z 512
/dev/nvme0n1: Permission denied

$ sudo chmod o+r /dev/nvme0n1

$ echo "hello" | nvme write /dev/nvme0n1 -s 0 -c 1 -z 512
Rounding data size to fit block count (8192 bytes)
write: Success


Am I supposed to be able to do a write if I only have read permission?

$ ls -al /dev/nvme0n1
brw-rw-r-- 1 root disk 259, 0 May 31 10:59 /dev/nvme0n1


Kind regards,
Niklas