On 7/1/19 4:54 AM, Paolo Pisati wrote:
> Full failure message:
>
> ...
> #13/p valid read map access into a read-only array 2 FAIL retval 65507 != -29
> verification time 14 usec
> stack depth 8
> processed 14 insns (limit 1000000) max_states_per_insn 0 total_states 2
> peak_states 2 mark_read 1
> ...
>
> this on 5.2-rc6, arm64 defconfig + CONFIG_BPF* enabled (full config here [1]).
> Any idea what could be wrong?
Below is the test case.
{
"valid read map access into a read-only array 2",
.insns = {
BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -8),
BPF_LD_MAP_FD(BPF_REG_1, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_map_lookup_elem),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 6),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
BPF_MOV64_IMM(BPF_REG_2, 4),
BPF_MOV64_IMM(BPF_REG_3, 0),
BPF_MOV64_IMM(BPF_REG_4, 0),
BPF_MOV64_IMM(BPF_REG_5, 0),
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
BPF_FUNC_csum_diff),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map_array_ro = { 3 },
.result = ACCEPT,
.retval = -29,
},
The issue may be with helper bpf_csum_diff().
Maybe you can check bpf_csum_diff() helper return value
to confirm and take a further look at bpf_csum_diff implementations
between x64 and amd64.
>
> 1: https://urldefense.proofpoint.com/v2/url?u=http-3A__paste.ubuntu.com_p_tXXFGCPwbp_&d=DwIBAg&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=ZFMh015yCHn-UOzwTfOnv5EUl8RHzWSgWyA7VzEAMTk&s=ZgEA0NOpPuepI2DQik8cv3bTDyF6Wx61yOB1OtnpCg0&e=
>
