On 10/16/2017 09:11 PM, Chenbo Feng wrote:

From: Chenbo Feng <redacted>

Introduce the map read/write flags to the eBPF syscalls that returns the
map fd. The flags is used to set up the file mode when construct a new
file descriptor for bpf maps. To not break the backward capability, the
f_flags is set to O_RDWR if the flag passed by syscall is 0. Otherwise
it should be O_RDONLY or O_WRONLY. When the userspace want to modify or
read the map content, it will check the file mode to see if it is
allowed to make the change.

Signed-off-by: Chenbo Feng <redacted>
Acked-by: Alexei Starovoitov <ast@kernel.org>

Acked-by: Daniel Borkmann <daniel@iogearbox.net>