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    Subject[PATCH 4.4 05/46] bpf/verifier: reject BPF_ALU64|BPF_END
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Edward Cree <ecree@solarflare.com>


    [ Upstream commit e67b8a685c7c984e834e3181ef4619cd7025a136 ]

    Neither ___bpf_prog_run nor the JITs accept it.
    Also adds a new test case.

    Fixes: 17a5267067f3 ("bpf: verifier (add verifier core)")
    Signed-off-by: Edward Cree <ecree@solarflare.com>
    Acked-by: Alexei Starovoitov <ast@kernel.org>
    Acked-by: Daniel Borkmann <daniel@iogearbox.net>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    kernel/bpf/verifier.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/kernel/bpf/verifier.c
    +++ b/kernel/bpf/verifier.c
    @@ -1033,7 +1033,8 @@ static int check_alu_op(struct verifier_
    }
    } else {
    if (insn->src_reg != BPF_REG_0 || insn->off != 0 ||
    - (insn->imm != 16 && insn->imm != 32 && insn->imm != 64)) {
    + (insn->imm != 16 && insn->imm != 32 && insn->imm != 64) ||
    + BPF_CLASS(insn->code) == BPF_ALU64) {
    verbose("BPF_END uses reserved fields\n");
    return -EINVAL;
    }

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