Chenbo Feng 84354172b5
BACKPORT: bpf: Add file mode configuration into bpf maps ...
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 <fengc@google.com >
Acked-by: Alexei Starovoitov <ast@kernel.org >
Acked-by: Daniel Borkmann <daniel@iogearbox.net >
Signed-off-by: David S. Miller <davem@davemloft.net >
Deleted the file mode configuration code in unsupported map type and
removed the file mode check in non-existing helper functions.
(cherry-pick from net-next: 6e71b04a82248ccf13a94b85cbc674a9fefe53f5)
Bug: 30950746
Change-Id: Icfad20f1abb77f91068d244fb0d87fa40824dd1b
Signed-off-by: Chatur27 <jasonbright2709@gmail.com >
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84354172b5