From: Eduard Zingerman <eddyz87@gmail.com>
To: bpf@vger.kernel.org, ast@kernel.org
Cc: andrii@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev,
kernel-team@fb.com, yonghong.song@linux.dev,
jose.marchesi@oracle.com, Eduard Zingerman <eddyz87@gmail.com>
Subject: [bpf-next v3 01/12] bpf: add a get_helper_proto() utility function
Date: Mon, 15 Jul 2024 16:01:50 -0700 [thread overview]
Message-ID: <20240715230201.3901423-2-eddyz87@gmail.com> (raw)
In-Reply-To: <20240715230201.3901423-1-eddyz87@gmail.com>
Extract the part of check_helper_call() as a utility function allowing
to query 'struct bpf_func_proto' for a specific helper function id.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
kernel/bpf/verifier.c | 25 ++++++++++++++++++-------
1 file changed, 18 insertions(+), 7 deletions(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index c0263fb5ca4b..3cef46134a51 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -10265,6 +10265,19 @@ static void update_loop_inline_state(struct bpf_verifier_env *env, u32 subprogno
state->callback_subprogno == subprogno);
}
+static int get_helper_proto(struct bpf_verifier_env *env, int func_id,
+ const struct bpf_func_proto **ptr)
+{
+ if (func_id < 0 || func_id >= __BPF_FUNC_MAX_ID)
+ return -ERANGE;
+
+ if (!env->ops->get_func_proto)
+ return -EINVAL;
+
+ *ptr = env->ops->get_func_proto(func_id, env->prog);
+ return *ptr ? 0 : -EINVAL;
+}
+
static int check_helper_call(struct bpf_verifier_env *env, struct bpf_insn *insn,
int *insn_idx_p)
{
@@ -10281,18 +10294,16 @@ static int check_helper_call(struct bpf_verifier_env *env, struct bpf_insn *insn
/* find function prototype */
func_id = insn->imm;
- if (func_id < 0 || func_id >= __BPF_FUNC_MAX_ID) {
- verbose(env, "invalid func %s#%d\n", func_id_name(func_id),
- func_id);
+ err = get_helper_proto(env, insn->imm, &fn);
+ if (err == -ERANGE) {
+ verbose(env, "invalid func %s#%d\n", func_id_name(func_id), func_id);
return -EINVAL;
}
- if (env->ops->get_func_proto)
- fn = env->ops->get_func_proto(func_id, env->prog);
- if (!fn) {
+ if (err) {
verbose(env, "program of this type cannot use helper %s#%d\n",
func_id_name(func_id), func_id);
- return -EINVAL;
+ return err;
}
/* eBPF programs must be GPL compatible to use GPL-ed functions */
--
2.45.2
next prev parent reply other threads:[~2024-07-15 23:02 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-15 23:01 [bpf-next v3 00/12] no_caller_saved_registers attribute for helper calls Eduard Zingerman
2024-07-15 23:01 ` Eduard Zingerman [this message]
2024-07-15 23:01 ` [bpf-next v3 02/12] bpf: " Eduard Zingerman
2024-07-16 1:51 ` Alexei Starovoitov
2024-07-16 5:34 ` Eduard Zingerman
2024-07-20 2:00 ` Alexei Starovoitov
2024-07-22 18:42 ` Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 03/12] bpf, x86, riscv, arm: no_caller_saved_registers for bpf_get_smp_processor_id() Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 04/12] selftests/bpf: extract utility function for BPF disassembly Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 05/12] selftests/bpf: print correct offset for pseudo calls in disasm_insn() Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 06/12] selftests/bpf: no need to track next_match_pos in struct test_loader Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 07/12] selftests/bpf: extract test_loader->expect_msgs as a data structure Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 08/12] selftests/bpf: allow checking xlated programs in verifier_* tests Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 09/12] selftests/bpf: __arch_* macro to limit test cases to specific archs Eduard Zingerman
2024-07-15 23:01 ` [bpf-next v3 10/12] selftests/bpf: test no_caller_saved_registers spill/fill removal Eduard Zingerman
2024-07-15 23:02 ` [bpf-next v3 11/12] bpf: do check_nocsr_stack_contract() for ARG_ANYTHING helper params Eduard Zingerman
2024-07-16 2:00 ` Alexei Starovoitov
2024-07-16 10:03 ` Eduard Zingerman
2024-07-16 18:15 ` Eduard Zingerman
2024-07-20 1:54 ` Alexei Starovoitov
2024-07-20 1:58 ` Eduard Zingerman
2024-07-15 23:02 ` [bpf-next v3 12/12] selftests/bpf: check nocsr contract for bpf_probe_read_kernel() Eduard Zingerman
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