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| author | Yafang Shao <laoar.shao@gmail.com> | 2019-01-23 12:37:19 +0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-01-23 12:22:22 +0100 |
| commit | c9e4576743eeda8d24dedc164d65b78877f9a98c (patch) | |
| tree | 0a9240f86f043b2e67ff4cb0641f33ffd9989afc | |
| parent | b0ca5ecb8e2279d706261f525f1bd0ba9e3fe800 (diff) | |
| download | linux-c9e4576743eeda8d24dedc164d65b78877f9a98c.tar.bz2 | |
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: 8c4b4c7e9ff0 ("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>
| -rw-r--r-- | net/core/filter.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 7559d6835ecb..7a54dc11ac2d 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4112,10 +4112,12 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, /* Only some socketops are supported */ switch (optname) { case SO_RCVBUF: + val = min_t(u32, val, sysctl_rmem_max); sk->sk_userlocks |= SOCK_RCVBUF_LOCK; sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); break; case SO_SNDBUF: + val = min_t(u32, val, sysctl_wmem_max); sk->sk_userlocks |= SOCK_SNDBUF_LOCK; sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); break; |