bpf: verifier remove the rejection on BPF_ALU | BPF_ARSH

Jiong Wang · Alexei Starovoitov · commit c49f7dbd4f9c · 2018-12-07T13:30:48.000-08:00
This patch remove the rejection on BPF_ALU | BPF_ARSH as we have supported
them on interpreter and all JIT back-ends

Reviewed-by: Jakub Kicinski &lt;jakub.kicinski@netronome.com&gt;
Signed-off-by: Jiong Wang &lt;jiong.wang@netronome.com&gt;
Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
@@ -3649,11 +3649,6 @@ static int check_alu_op(struct bpf_verifier_env *env, struct bpf_insn *insn)
 			return -EINVAL;
 		}
 
-		if (opcode == BPF_ARSH && BPF_CLASS(insn->code) != BPF_ALU64) {
-			verbose(env, "BPF_ARSH not supported for 32 bit ALU\n");
-			return -EINVAL;
-		}
-
 		if ((opcode == BPF_LSH || opcode == BPF_RSH ||
 		     opcode == BPF_ARSH) && BPF_SRC(insn->code) == BPF_K) {
 			int size = BPF_CLASS(insn->code) == BPF_ALU64 ? 64 : 32;
