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bpf: sock recvbuff must be limited by rmem_max in bpf_setsockopt() 

When sock recvbuff is set by bpf_setsockopt(), the value must by
limited by rmem_max. It is the same with sendbuff.

Fixes: 8c4b4c7e9f ("bpf: Add setsockopt helper function to bpf")
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yafang Shao 2019-01-23 12:37:19 +08:00 committed by Daniel Borkmann
parent b0ca5ecb8e
commit c9e4576743
1 changed files with 2 additions and 0 deletions
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2
net/core/filter.c
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@ -4112,10 +4112,12 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
/* Only some socketops are supported */ /* Only some socketops are supported */
switch (optname) { switch (optname) {
case SO_RCVBUF: case SO_RCVBUF:
val = min_t(u32, val, sysctl_rmem_max);
sk->sk_userlocks |= SOCK_RCVBUF_LOCK; sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
break; break;
case SO_SNDBUF: case SO_SNDBUF:
val = min_t(u32, val, sysctl_wmem_max);
sk->sk_userlocks |= SOCK_SNDBUF_LOCK; sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF);
break; break;