bpf: Save PTR_TO_BTF_ID register state when spilling to stack

This patch makes the verifier save the PTR_TO_BTF_ID register state when
spilling to the stack.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20200109003454.3854870-1-kafai@fb.com

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 6f63ae7a370c0e8b91ab3fe101602ac7f36b5c03..d433d70022fda1f863c0411830cf7f97e5e67f87 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -1916,6 +1916,7 @@ static bool is_spillable_regtype(enum bpf_reg_type type)
        case PTR_TO_TCP_SOCK:
        case PTR_TO_TCP_SOCK_OR_NULL:
        case PTR_TO_XDP_SOCK:
+       case PTR_TO_BTF_ID:
                return true;
        default:
                return false;