From b09928b976280d64060d7bee146d7df5c5a29bef Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Wed, 24 Oct 2018 22:05:49 +0200 Subject: [PATCH] bpf: make direct packet write unclone more robust Given this seems to be quite fragile and can easily slip through the cracks, lets make direct packet write more robust by requiring that future program types which allow for such write must provide a prologue callback. In case of XDP and sk_msg it's noop, thus add a generic noop handler there. The latter starts out with NULL data/data_end unconditionally when sg pages are shared. Signed-off-by: Daniel Borkmann Acked-by: Alexei Starovoitov Acked-by: Song Liu Signed-off-by: Alexei Starovoitov --- kernel/bpf/verifier.c | 6 +++++- net/core/filter.c | 11 +++++++++++ 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 5fc9a658af0e..171a2c88e77d 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -5709,7 +5709,11 @@ static int convert_ctx_accesses(struct bpf_verifier_env *env) bool is_narrower_load; u32 target_size; - if (ops->gen_prologue) { + if (ops->gen_prologue || env->seen_direct_write) { + if (!ops->gen_prologue) { + verbose(env, "bpf verifier is misconfigured\n"); + return -EINVAL; + } cnt = ops->gen_prologue(insn_buf, env->seen_direct_write, env->prog); if (cnt >= ARRAY_SIZE(insn_buf)) { diff --git a/net/core/filter.c b/net/core/filter.c index 3fdddfa9a0fd..cd648d09a8e5 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5644,6 +5644,15 @@ static bool sock_filter_is_valid_access(int off, int size, prog->expected_attach_type); } +static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, + const struct bpf_prog *prog) +{ + /* Neither direct read nor direct write requires any preliminary + * action. + */ + return 0; +} + static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, const struct bpf_prog *prog, int drop_verdict) { @@ -7210,6 +7219,7 @@ const struct bpf_verifier_ops xdp_verifier_ops = { .get_func_proto = xdp_func_proto, .is_valid_access = xdp_is_valid_access, .convert_ctx_access = xdp_convert_ctx_access, + .gen_prologue = bpf_noop_prologue, }; const struct bpf_prog_ops xdp_prog_ops = { @@ -7308,6 +7318,7 @@ const struct bpf_verifier_ops sk_msg_verifier_ops = { .get_func_proto = sk_msg_func_proto, .is_valid_access = sk_msg_is_valid_access, .convert_ctx_access = sk_msg_convert_ctx_access, + .gen_prologue = bpf_noop_prologue, }; const struct bpf_prog_ops sk_msg_prog_ops = { -- 2.30.2