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| author |   John Fastabend <john.fastabend@gmail.com> | 2017-10-18 07:10:58 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-10-20 13:01:29 +0100 |
| commit | f7e9cb1ecb6d922584abff16db07930162c57155 (patch) | |
| tree | 3686d4b38db981a9289725f9c9aed66ed59b7607 /net/core/filter.c | |
| parent | bpf: avoid preempt enable/disable in sockmap using tcp_skb_cb region (diff) | |
| download | linux-dev-f7e9cb1ecb6d922584abff16db07930162c57155.tar.xz linux-dev-f7e9cb1ecb6d922584abff16db07930162c57155.zip | |
bpf: remove mark access for SK_SKB program types
The skb->mark field is a union with reserved_tailroom which is used
in the TCP code paths from stream memory allocation. Allowing SK_SKB
programs to set this field creates a conflict with future code
optimizations, such as "gifting" the skb to the egress path instead
of creating a new skb and doing a memcpy.
Because we do not have a released version of SK_SKB yet lets just
remove it for now. A more appropriate scratch pad to use at the
socket layer is dev_scratch, but lets add that in future kernels
when needed.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/filter.c')
| -rw-r--r-- | net/core/filter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index ca1ba0bbfbc2..aa0265997f93 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -3684,7 +3684,6 @@ static bool sk_skb_is_valid_access(int off, int size, { if (type == BPF_WRITE) { switch (off) { - case bpf_ctx_range(struct __sk_buff, mark): case bpf_ctx_range(struct __sk_buff, tc_index): case bpf_ctx_range(struct __sk_buff, priority): break; @@ -3694,6 +3693,7 @@ static bool sk_skb_is_valid_access(int off, int size, } switch (off) { + case bpf_ctx_range(struct __sk_buff, mark): case bpf_ctx_range(struct __sk_buff, tc_classid): return false; case bpf_ctx_range(struct __sk_buff, data): |