new file mode 100644
@@ -0,0 +1,50 @@
+{
+ "helper_ret: get_cgroup_classid: __u32",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ 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_6),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+ BPF_EMIT_CALL(BPF_FUNC_get_cgroup_classid),
+ BPF_JMP32_IMM(BPF_JGE, BPF_REG_0, 7, 2),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_0),
+ BPF_ST_MEM(BPF_B, BPF_REG_6, 0, 0),
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .fixup_map_hash_48b = { 4 },
+ .result = ACCEPT,
+ .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
+},
+{
+ "helper_ret: skb_pull_data: __s32",
+ .insns = {
+ BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 0),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
+ 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, 8),
+ BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
+ BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
+ BPF_MOV64_IMM(BPF_REG_2, 4),
+ BPF_EMIT_CALL(BPF_FUNC_skb_pull_data),
+ BPF_JMP32_IMM(BPF_JSLT, BPF_REG_0, 1, 3),
+ BPF_JMP32_IMM(BPF_JSGE, BPF_REG_0, 7, 2),
+ BPF_ALU64_REG(BPF_ADD, BPF_REG_6, BPF_REG_0),
+ BPF_ST_MEM(BPF_B, BPF_REG_6, 0, 0),
+ BPF_MOV32_IMM(BPF_REG_0, 0),
+ BPF_EXIT_INSN(),
+ },
+ .prog_type = BPF_PROG_TYPE_SCHED_CLS,
+ .fixup_map_hash_48b = { 4 },
+ .result = ACCEPT,
+ .flags = F_NEEDS_EFFICIENT_UNALIGNED_ACCESS,
+},
Added two verifier tests for helper returning s32/u32. The return value is refined with jmp32 instruction and later the whole r0 is used. With the previous patch, two tests will fail. Signed-off-by: Yonghong Song <yhs@fb.com> --- .../selftests/bpf/verifier/helper_ret.c | 50 +++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 tools/testing/selftests/bpf/verifier/helper_ret.c