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selftests/bpf: Add tp_btf CO-RE reloc test for modules 

Add another CO-RE relocation test for kernel module relocations. This time for
tp_btf with direct memory reads.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201203204634.1325171-14-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2020-12-03 12:46:33 -08:00 committed by Alexei Starovoitov
parent 91abb4a6d7
commit bc9ed69c79
2 changed files with 33 additions and 2 deletions
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3
tools/testing/selftests/bpf/prog_tests/core_reloc.c
View File

@ -514,7 +514,8 @@ static struct core_reloc_test_case test_cases[] = {
},
/* validate we can find kernel module BTF types for relocs/attach */
MODULES_CASE("module", "raw_tp/bpf_testmod_test_read", "bpf_testmod_test_read"),
MODULES_CASE("module_probed", "raw_tp/bpf_testmod_test_read", "bpf_testmod_test_read"),
MODULES_CASE("module_direct", "tp_btf/bpf_testmod_test_read", NULL),
/* validate BPF program can use multiple flavors to match against
* single target BTF type

32
tools/testing/selftests/bpf/progs/test_core_reloc_module.c
View File

@ -36,7 +36,7 @@ struct core_reloc_module_output {
};
SEC("raw_tp/bpf_testmod_test_read")
int BPF_PROG(test_core_module,
int BPF_PROG(test_core_module_probed,
struct task_struct *task,
struct bpf_testmod_test_read_ctx *read_ctx)
{
@ -64,3 +64,33 @@ int BPF_PROG(test_core_module,
return 0;
}
SEC("tp_btf/bpf_testmod_test_read")
int BPF_PROG(test_core_module_direct,
struct task_struct *task,
struct bpf_testmod_test_read_ctx *read_ctx)
{
struct core_reloc_module_output *out = (void *)&data.out;
__u64 pid_tgid = bpf_get_current_pid_tgid();
__u32 real_tgid = (__u32)(pid_tgid >> 32);
__u32 real_pid = (__u32)pid_tgid;
if (data.my_pid_tgid != pid_tgid)
return 0;
if (task->pid != real_pid || task->tgid != real_tgid)
return 0;
out->len = read_ctx->len;
out->off = read_ctx->off;
out->read_ctx_sz = bpf_core_type_size(struct bpf_testmod_test_read_ctx);
out->read_ctx_exists = bpf_core_type_exists(struct bpf_testmod_test_read_ctx);
out->buf_exists = bpf_core_field_exists(read_ctx->buf);
out->off_exists = bpf_core_field_exists(read_ctx->off);
out->len_exists = bpf_core_field_exists(read_ctx->len);
out->comm_len = BPF_CORE_READ_STR_INTO(&out->comm, task, comm);
return 0;
}