bpf, verifier: reject xadd on flow key memory
We should not enable xadd operation for flow key memory if not needed there anyway. There is no such issue as described in the commit f37a8cb8 ("bpf: reject stores into ctx via st and xadd") since there's no context rewriter for flow keys today, but it also shouldn't become part of the user facing behavior to allow for it. After patch: 0: (79) r7 = *(u64 *)(r1 +144) 1: (b7) r3 = 4096 2: (db) lock *(u64 *)(r7 +0) += r3 BPF_XADD stores into R7 flow_keys is not allowed Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Showing
Please register or sign in to comment