On Fri, Apr 07, 2023 at 04:46:06PM +0800, Feng zhou wrote:
> From: Feng Zhou <zhoufeng.zf@bytedance.com>
>
> When access traced function arguments with type is u32*, bpf verifier failed.
> Because u32 have typedef, needs to skip modifier. Add btf_type_is_modifier in
> is_int_ptr. Add a selftest to check it.
>
> Feng Zhou (2):
> bpf/btf: Fix is_int_ptr()
> selftests/bpf: Add test to access u32 ptr argument in tracing program
hi,
it breaks several tests in test_progs suite:
#11/36 bpf_iter/link-iter:FAIL
#11 bpf_iter:FAIL
test_dummy_st_ops_attach:FAIL:dummy_st_ops_load unexpected error: -13
#63/1 dummy_st_ops/dummy_st_ops_attach:FAIL
test_dummy_init_ret_value:FAIL:dummy_st_ops_load unexpected error: -13
#63/2 dummy_st_ops/dummy_init_ret_value:FAIL
test_dummy_init_ptr_arg:FAIL:dummy_st_ops_load unexpected error: -13
#63/3 dummy_st_ops/dummy_init_ptr_arg:FAIL
test_dummy_multiple_args:FAIL:dummy_st_ops_load unexpected error: -13
#63/4 dummy_st_ops/dummy_multiple_args:FAIL
test_dummy_sleepable:FAIL:dummy_st_ops_load unexpected error: -13
#63/5 dummy_st_ops/dummy_sleepable:FAIL
#63 dummy_st_ops:FAIL
test_fentry_fexit:FAIL:fentry_skel_load unexpected error: -13
#69 fentry_fexit:FAIL
test_fentry_test:FAIL:fentry_skel_load unexpected error: -13
#70 fentry_test:FAIL
jirka
>
> Changelog:
> v1->v2: Addressed comments from Martin KaFai Lau
> - Add a selftest.
> - use btf_type_skip_modifiers.
> Some details in here:
> https://lore.kernel.org/all/20221012125815.76120-1-zhouchengming@bytedance.com/
>
> kernel/bpf/btf.c | 5 ++---
> net/bpf/test_run.c | 8 +++++++-
> .../testing/selftests/bpf/verifier/btf_ctx_access.c | 13 +++++++++++++
> 3 files changed, 22 insertions(+), 4 deletions(-)
>
> --
> 2.20.1
>