From: Andrii Nakryiko andrii@kernel.org
mainline inclusion from mainline-5.11-rc1 commit bc9ed69c79ae7577314a24e09c5b0d1c1c314ced category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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 (cherry picked from commit bc9ed69c79ae7577314a24e09c5b0d1c1c314ced) Signed-off-by: Wang Yufen wangyufen@huawei.com --- .../selftests/bpf/prog_tests/core_reloc.c | 3 +- .../bpf/progs/test_core_reloc_module.c | 32 ++++++++++++++++++- 2 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/core_reloc.c b/tools/testing/selftests/bpf/prog_tests/core_reloc.c index e2cfbb4b4113..a9127478d5e0 100644 --- a/tools/testing/selftests/bpf/prog_tests/core_reloc.c +++ b/tools/testing/selftests/bpf/prog_tests/core_reloc.c @@ -509,7 +509,8 @@ 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 diff --git a/tools/testing/selftests/bpf/progs/test_core_reloc_module.c b/tools/testing/selftests/bpf/progs/test_core_reloc_module.c index d1840c1a9d36..56363959f7b0 100644 --- a/tools/testing/selftests/bpf/progs/test_core_reloc_module.c +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_module.c @@ -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; +}