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From: Alexei Starovoitov <ast@kernel.org>
To: <davem@davemloft.net>
Cc: <daniel@iogearbox.net>, <netdev@vger.kernel.org>,
	<bpf@vger.kernel.org>, <kernel-team@fb.com>
Subject: [PATCH bpf 1/2] bpf: fix BTF verification of enums
Date: Tue, 17 Sep 2019 10:45:37 -0700	[thread overview]
Message-ID: <20190917174538.1295523-2-ast@kernel.org> (raw)
In-Reply-To: <20190917174538.1295523-1-ast@kernel.org>

vmlinux BTF has enums that are 8 byte and 1 byte in size.
2 byte enum is a valid construct as well.
Fix BTF enum verification to accept those sizes.

Fixes: 69b693f0aefa ("bpf: btf: Introduce BPF Type Format (BTF)")
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
 kernel/bpf/btf.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index adb3adcebe3c..722d38e543e9 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -2377,9 +2377,8 @@ static s32 btf_enum_check_meta(struct btf_verifier_env *env,
 		return -EINVAL;
-	if (t->size != sizeof(int)) {
-		btf_verifier_log_type(env, t, "Expected size:%zu",
-				      sizeof(int));
+	if (t->size > 8 || !is_power_of_2(t->size)) {
+		btf_verifier_log_type(env, t, "Unexpected size");
 		return -EINVAL;

  reply	other threads:[~2019-09-17 17:45 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17 17:45 [PATCH bpf 0/2] bpf: BTF fixes Alexei Starovoitov
2019-09-17 17:45 ` Alexei Starovoitov [this message]
2019-09-17 17:45 ` [PATCH bpf 2/2] bpf: fix BTF limits Alexei Starovoitov
2019-09-17 19:35 ` [PATCH bpf 0/2] bpf: BTF fixes Andrii Nakryiko
2019-09-19 12:33 ` Daniel Borkmann

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