From: Yonghong Song <yhs@fb.com>
To: Alexei Starovoitov <ast@kernel.org>,
"davem@davemloft.net" <davem@davemloft.net>
Cc: "daniel@iogearbox.net" <daniel@iogearbox.net>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>,
Kernel Team <Kernel-team@fb.com>
Subject: Re: [PATCH bpf-next] bpf: fix bpf_attr.attach_btf_id check
Date: Fri, 18 Oct 2019 17:59:53 +0000 [thread overview]
Message-ID: <8a75a0e4-2202-7a3f-dfd2-45b25f8c5147@fb.com> (raw)
In-Reply-To: <20191018060933.2950231-1-ast@kernel.org>
On 10/17/19 11:09 PM, Alexei Starovoitov wrote:
> Only raw_tracepoint program type can have bpf_attr.attach_btf_id >= 0.
> Make sure to reject other program types that accidentally set it to non-zero.
>
> Fixes: ccfe29eb29c2 ("bpf: Add attach_btf_id attribute to program load")
> Reported-by: Andrii Nakryiko <andriin@fb.com>
> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
> ---
> kernel/bpf/syscall.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index 523e3ac15a08..16ea3c0db4f6 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -1570,6 +1570,17 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
> enum bpf_attach_type expected_attach_type,
> u32 btf_id)
> {
> + switch (prog_type) {
> + case BPF_PROG_TYPE_RAW_TRACEPOINT:
> + if (btf_id > BTF_MAX_TYPE)
> + return -EINVAL;
> + break;
> + default:
> + if (btf_id)
> + return -EINVAL;
> + break;
> + }
> +
> switch (prog_type) {
> case BPF_PROG_TYPE_CGROUP_SOCK:
> switch (expected_attach_type) {
> @@ -1610,13 +1621,7 @@ bpf_prog_load_check_attach(enum bpf_prog_type prog_type,
> default:
> return -EINVAL;
> }
> - case BPF_PROG_TYPE_RAW_TRACEPOINT:
> - if (btf_id > BTF_MAX_TYPE)
> - return -EINVAL;
> - return 0;
> default:
> - if (btf_id)
> - return -EINVAL;
> return 0;
> }
> }
>
next prev parent reply other threads:[~2019-10-18 18:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 6:09 [PATCH bpf-next] bpf: fix bpf_attr.attach_btf_id check Alexei Starovoitov
2019-10-18 17:59 ` Yonghong Song [this message]
2019-10-18 19:10 ` Daniel Borkmann
2019-10-18 23:28 ` Andrii Nakryiko
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