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bpf: Allow cgroup sock filters to use get_current_uid_gid helper 

Allow BPF programs run on sock create to use the get_current_uid_gid
helper. IPv4 and IPv6 sockets are created in a process context so
there is always a valid uid/gid

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
David Ahern 2017-08-31 15:05:45 -07:00 committed by David S. Miller
parent 482dca939f
commit ae2cf1c466
1 changed files with 15 additions and 1 deletions
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16
net/core/filter.c
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@ -3149,6 +3149,20 @@ bpf_base_func_proto(enum bpf_func_id func_id)
}
}
static const struct bpf_func_proto *
sock_filter_func_proto(enum bpf_func_id func_id)
{
switch (func_id) {
/* inet and inet6 sockets are created in a process
* context so there is always a valid uid/gid
*/
case BPF_FUNC_get_current_uid_gid:
return &bpf_get_current_uid_gid_proto;
default:
return bpf_base_func_proto(func_id);
}
}
static const struct bpf_func_proto *
sk_filter_func_proto(enum bpf_func_id func_id)
{
@ -4233,7 +4247,7 @@ const struct bpf_verifier_ops lwt_xmit_prog_ops = {
};
const struct bpf_verifier_ops cg_sock_prog_ops = {
.get_func_proto = bpf_base_func_proto,
.get_func_proto = sock_filter_func_proto,
.is_valid_access = sock_filter_is_valid_access,
.convert_ctx_access = sock_filter_convert_ctx_access,
};