netdev - Re: [PATCH v2 bpf-next 3/3] selftests/bpf: Add asm tests for pkt vs pkt

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Wed, 20 Jan 2021 21:51:03 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     davem@...emloft.net, daniel@...earbox.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH v2 bpf-next 3/3] selftests/bpf: Add asm tests for pkt vs
 pkt_end comparison.

On Tue, Nov 10, 2020 at 07:12:13PM -0800, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@...nel.org>
> 
> Add few assembly tests for packet comparison.
> 
> Tested-by: Jiri Olsa <jolsa@...hat.com>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

hi,
I'm now getting error when running this test:

#347/p pkt_end < pkt taken check Did not run the program (not supported) OK
Summary: 1 PASSED, 0 SKIPPED, 0 FAILED

it looks like my kernel does not have prog->aux->ops->test_run
defined for BPF_PROG_TYPE_SK_SKB for some reason

do I miss some config option? I recall running this
back in November, so I'm confused ;-)

thanks,
jirka

> ---
>  .../testing/selftests/bpf/verifier/ctx_skb.c  | 42 +++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/verifier/ctx_skb.c b/tools/testing/selftests/bpf/verifier/ctx_skb.c
> index 2e16b8e268f2..2022c0f2cd75 100644
> --- a/tools/testing/selftests/bpf/verifier/ctx_skb.c
> +++ b/tools/testing/selftests/bpf/verifier/ctx_skb.c
> @@ -1089,3 +1089,45 @@
>  	.errstr_unpriv = "R1 leaks addr",
>  	.result = REJECT,
>  },
> +{
> +       "pkt > pkt_end taken check",
> +       .insns = {
> +       BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,                //  0. r2 = *(u32 *)(r1 + data_end)
> +                   offsetof(struct __sk_buff, data_end)),
> +       BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_1,                //  1. r4 = *(u32 *)(r1 + data)
> +                   offsetof(struct __sk_buff, data)),
> +       BPF_MOV64_REG(BPF_REG_3, BPF_REG_4),                    //  2. r3 = r4
> +       BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 42),                  //  3. r3 += 42
> +       BPF_MOV64_IMM(BPF_REG_1, 0),                            //  4. r1 = 0
> +       BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_2, 2),          //  5. if r3 > r2 goto 8
> +       BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 14),                  //  6. r4 += 14
> +       BPF_MOV64_REG(BPF_REG_1, BPF_REG_4),                    //  7. r1 = r4
> +       BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_2, 1),          //  8. if r3 > r2 goto 10
> +       BPF_LDX_MEM(BPF_H, BPF_REG_2, BPF_REG_1, 9),            //  9. r2 = *(u8 *)(r1 + 9)
> +       BPF_MOV64_IMM(BPF_REG_0, 0),                            // 10. r0 = 0
> +       BPF_EXIT_INSN(),                                        // 11. exit
> +       },
> +       .result = ACCEPT,
> +       .prog_type = BPF_PROG_TYPE_SK_SKB,
> +},
> +{
> +       "pkt_end < pkt taken check",
> +       .insns = {
> +       BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,                //  0. r2 = *(u32 *)(r1 + data_end)
> +                   offsetof(struct __sk_buff, data_end)),
> +       BPF_LDX_MEM(BPF_W, BPF_REG_4, BPF_REG_1,                //  1. r4 = *(u32 *)(r1 + data)
> +                   offsetof(struct __sk_buff, data)),
> +       BPF_MOV64_REG(BPF_REG_3, BPF_REG_4),                    //  2. r3 = r4
> +       BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 42),                  //  3. r3 += 42
> +       BPF_MOV64_IMM(BPF_REG_1, 0),                            //  4. r1 = 0
> +       BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_2, 2),          //  5. if r3 > r2 goto 8
> +       BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 14),                  //  6. r4 += 14
> +       BPF_MOV64_REG(BPF_REG_1, BPF_REG_4),                    //  7. r1 = r4
> +       BPF_JMP_REG(BPF_JLT, BPF_REG_2, BPF_REG_3, 1),          //  8. if r2 < r3 goto 10
> +       BPF_LDX_MEM(BPF_H, BPF_REG_2, BPF_REG_1, 9),            //  9. r2 = *(u8 *)(r1 + 9)
> +       BPF_MOV64_IMM(BPF_REG_0, 0),                            // 10. r0 = 0
> +       BPF_EXIT_INSN(),                                        // 11. exit
> +       },
> +       .result = ACCEPT,
> +       .prog_type = BPF_PROG_TYPE_SK_SKB,
> +},
> -- 
> 2.24.1
>