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| author | Song Liu <songliubraving@fb.com> | 2018-10-19 09:57:58 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-10-19 13:49:34 -0700 |
| commit | 2cb494a36c98279c5c6ce8e99cf9776f15449ade (patch) | |
| tree | c8a67095d219b652a8eea067188bff6c599e6881 /net | |
| parent | b39b5f411dcfce28ff954e5d6acb2c11be3cb0ec (diff) | |
| download | linux-2cb494a36c98279c5c6ce8e99cf9776f15449ade.tar.gz linux-2cb494a36c98279c5c6ce8e99cf9776f15449ade.tar.bz2 linux-2cb494a36c98279c5c6ce8e99cf9776f15449ade.zip | |
bpf: add tests for direct packet access from CGROUP_SKB
Tests are added to make sure CGROUP_SKB cannot access:
tc_classid, data_meta, flow_keys
and can read and write:
mark, prority, and cb[0-4]
and can read other fields.
To make selftest with skb->sk work, a dummy sk is added in
bpf_prog_test_run_skb().
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/bpf/test_run.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c index 0c423b8cd75c..c89c22c49015 100644 --- a/net/bpf/test_run.c +++ b/net/bpf/test_run.c @@ -10,6 +10,8 @@ #include <linux/etherdevice.h> #include <linux/filter.h> #include <linux/sched/signal.h> +#include <net/sock.h> +#include <net/tcp.h> static __always_inline u32 bpf_test_run_one(struct bpf_prog *prog, void *ctx, struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE]) @@ -115,6 +117,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, u32 retval, duration; int hh_len = ETH_HLEN; struct sk_buff *skb; + struct sock *sk; void *data; int ret; @@ -137,11 +140,21 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, break; } + sk = kzalloc(sizeof(struct sock), GFP_USER); + if (!sk) { + kfree(data); + return -ENOMEM; + } + sock_net_set(sk, current->nsproxy->net_ns); + sock_init_data(NULL, sk); + skb = build_skb(data, 0); if (!skb) { kfree(data); + kfree(sk); return -ENOMEM; } + skb->sk = sk; skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); __skb_put(skb, size); @@ -159,6 +172,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, if (pskb_expand_head(skb, nhead, 0, GFP_USER)) { kfree_skb(skb); + kfree(sk); return -ENOMEM; } } @@ -171,6 +185,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, size = skb_headlen(skb); ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration); kfree_skb(skb); + kfree(sk); return ret; } |