netdev - Re: [PATCH bpf-next] bpf: fix bpf_attr.attach_btf

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Date:   Fri, 18 Oct 2019 17:59:53 +0000
From:   Yonghong Song <yhs@...com>
To:     Alexei Starovoitov <ast@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
CC:     "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next] bpf: fix bpf_attr.attach_btf_id check



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@...com>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Yonghong Song <yhs@...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;
>   	}
>   }
>