diff options
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/bpf/bpftool/link.c | 6 | ||||
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/DENYLIST.aarch64 | 1 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 5 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/missed.c | 138 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/missed_kprobe.c | 30 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/missed_kprobe_recursion.c | 48 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/missed_tp_recursion.c | 41 |
9 files changed, 273 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c index 2e5c231e08ac..4b1407b05056 100644 --- a/tools/bpf/bpftool/link.c +++ b/tools/bpf/bpftool/link.c @@ -265,6 +265,7 @@ show_kprobe_multi_json(struct bpf_link_info *info, json_writer_t *wtr) jsonw_bool_field(json_wtr, "retprobe", info->kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN); jsonw_uint_field(json_wtr, "func_cnt", info->kprobe_multi.count); + jsonw_uint_field(json_wtr, "missed", info->kprobe_multi.missed); jsonw_name(json_wtr, "funcs"); jsonw_start_array(json_wtr); addrs = u64_to_ptr(info->kprobe_multi.addrs); @@ -301,6 +302,7 @@ show_perf_event_kprobe_json(struct bpf_link_info *info, json_writer_t *wtr) jsonw_string_field(wtr, "func", u64_to_ptr(info->perf_event.kprobe.func_name)); jsonw_uint_field(wtr, "offset", info->perf_event.kprobe.offset); + jsonw_uint_field(wtr, "missed", info->perf_event.kprobe.missed); } static void @@ -641,6 +643,8 @@ static void show_kprobe_multi_plain(struct bpf_link_info *info) else printf("\n\tkprobe.multi "); printf("func_cnt %u ", info->kprobe_multi.count); + if (info->kprobe_multi.missed) + printf("missed %llu ", info->kprobe_multi.missed); addrs = (__u64 *)u64_to_ptr(info->kprobe_multi.addrs); qsort(addrs, info->kprobe_multi.count, sizeof(__u64), cmp_u64); @@ -683,6 +687,8 @@ static void show_perf_event_kprobe_plain(struct bpf_link_info *info) printf("%s", buf); if (info->perf_event.kprobe.offset) printf("+%#x", info->perf_event.kprobe.offset); + if (info->perf_event.kprobe.missed) + printf(" missed %llu", info->perf_event.kprobe.missed); printf(" "); } diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 5f13db15a3c7..70bfa997e896 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -6532,6 +6532,7 @@ struct bpf_link_info { __aligned_u64 addrs; __u32 count; /* in/out: kprobe_multi function count */ __u32 flags; + __u64 missed; } kprobe_multi; struct { __u32 type; /* enum bpf_perf_event_type */ @@ -6547,6 +6548,7 @@ struct bpf_link_info { __u32 name_len; __u32 offset; /* offset from func_name */ __u64 addr; + __u64 missed; } kprobe; /* BPF_PERF_EVENT_KPROBE, BPF_PERF_EVENT_KRETPROBE */ struct { __aligned_u64 tp_name; /* in/out */ diff --git a/tools/testing/selftests/bpf/DENYLIST.aarch64 b/tools/testing/selftests/bpf/DENYLIST.aarch64 index 1e827c24761c..5c2cc7e8c5d0 100644 --- a/tools/testing/selftests/bpf/DENYLIST.aarch64 +++ b/tools/testing/selftests/bpf/DENYLIST.aarch64 @@ -10,3 +10,4 @@ fexit_test/fexit_many_args # fexit_many_args:FAIL:fexit_ma fill_link_info/kprobe_multi_link_info # bpf_program__attach_kprobe_multi_opts unexpected error: -95 fill_link_info/kretprobe_multi_link_info # bpf_program__attach_kprobe_multi_opts unexpected error: -95 fill_link_info/kprobe_multi_invalid_ubuff # bpf_program__attach_kprobe_multi_opts unexpected error: -95 +missed/kprobe_recursion # missed_kprobe_recursion__attach unexpected error: -95 (errno 95) diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c index cefc5dd72573..a5e246f7b202 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c @@ -138,6 +138,10 @@ __bpf_kfunc void bpf_iter_testmod_seq_destroy(struct bpf_iter_testmod_seq *it) it->cnt = 0; } +__bpf_kfunc void bpf_kfunc_common_test(void) +{ +} + struct bpf_testmod_btf_type_tag_1 { int a; }; @@ -343,6 +347,7 @@ BTF_SET8_START(bpf_testmod_common_kfunc_ids) BTF_ID_FLAGS(func, bpf_iter_testmod_seq_new, KF_ITER_NEW) BTF_ID_FLAGS(func, bpf_iter_testmod_seq_next, KF_ITER_NEXT | KF_RET_NULL) BTF_ID_FLAGS(func, bpf_iter_testmod_seq_destroy, KF_ITER_DESTROY) +BTF_ID_FLAGS(func, bpf_kfunc_common_test) BTF_SET8_END(bpf_testmod_common_kfunc_ids) static const struct btf_kfunc_id_set bpf_testmod_common_kfunc_set = { diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h index f5c5b1375c24..7c664dd61059 100644 --- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h +++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod_kfunc.h @@ -104,4 +104,6 @@ void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p); void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p); void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p); void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len); + +void bpf_kfunc_common_test(void) __ksym; #endif /* _BPF_TESTMOD_KFUNC_H */ diff --git a/tools/testing/selftests/bpf/prog_tests/missed.c b/tools/testing/selftests/bpf/prog_tests/missed.c new file mode 100644 index 000000000000..24ade11f5c05 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/missed.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <test_progs.h> +#include "missed_kprobe.skel.h" +#include "missed_kprobe_recursion.skel.h" +#include "missed_tp_recursion.skel.h" + +/* + * Putting kprobe on bpf_fentry_test1 that calls bpf_kfunc_common_test + * kfunc, which has also kprobe on. The latter won't get triggered due + * to kprobe recursion check and kprobe missed counter is incremented. + */ +static void test_missed_perf_kprobe(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct bpf_link_info info = {}; + struct missed_kprobe *skel; + __u32 len = sizeof(info); + int err, prog_fd; + + skel = missed_kprobe__open_and_load(); + if (!ASSERT_OK_PTR(skel, "missed_kprobe__open_and_load")) + goto cleanup; + + err = missed_kprobe__attach(skel); + if (!ASSERT_OK(err, "missed_kprobe__attach")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.trigger); + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(topts.retval, 0, "test_run"); + + err = bpf_link_get_info_by_fd(bpf_link__fd(skel->links.test2), &info, &len); + if (!ASSERT_OK(err, "bpf_link_get_info_by_fd")) + goto cleanup; + + ASSERT_EQ(info.type, BPF_LINK_TYPE_PERF_EVENT, "info.type"); + ASSERT_EQ(info.perf_event.type, BPF_PERF_EVENT_KPROBE, "info.perf_event.type"); + ASSERT_EQ(info.perf_event.kprobe.missed, 1, "info.perf_event.kprobe.missed"); + +cleanup: + missed_kprobe__destroy(skel); +} + +static __u64 get_missed_count(int fd) +{ + struct bpf_prog_info info = {}; + __u32 len = sizeof(info); + int err; + + err = bpf_prog_get_info_by_fd(fd, &info, &len); + if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd")) + return (__u64) -1; + return info.recursion_misses; +} + +/* + * Putting kprobe.multi on bpf_fentry_test1 that calls bpf_kfunc_common_test + * kfunc which has 3 perf event kprobes and 1 kprobe.multi attached. + * + * Because fprobe (kprobe.multi attach layear) does not have strict recursion + * check the kprobe's bpf_prog_active check is hit for test2-5. + */ +static void test_missed_kprobe_recursion(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct missed_kprobe_recursion *skel; + int err, prog_fd; + + skel = missed_kprobe_recursion__open_and_load(); + if (!ASSERT_OK_PTR(skel, "missed_kprobe_recursion__open_and_load")) + goto cleanup; + + err = missed_kprobe_recursion__attach(skel); + if (!ASSERT_OK(err, "missed_kprobe_recursion__attach")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.trigger); + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(topts.retval, 0, "test_run"); + + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test1)), 0, "test1_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test2)), 1, "test2_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test3)), 1, "test3_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test4)), 1, "test4_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test5)), 1, "test5_recursion_misses"); + +cleanup: + missed_kprobe_recursion__destroy(skel); +} + +/* + * Putting kprobe on bpf_fentry_test1 that calls bpf_printk and invokes + * bpf_trace_printk tracepoint. The bpf_trace_printk tracepoint has test[234] + * programs attached to it. + * + * Because kprobe execution goes through bpf_prog_active check, programs + * attached to the tracepoint will fail the recursion check and increment + * the recursion_misses stats. + */ +static void test_missed_tp_recursion(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct missed_tp_recursion *skel; + int err, prog_fd; + + skel = missed_tp_recursion__open_and_load(); + if (!ASSERT_OK_PTR(skel, "missed_tp_recursion__open_and_load")) + goto cleanup; + + err = missed_tp_recursion__attach(skel); + if (!ASSERT_OK(err, "missed_tp_recursion__attach")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.trigger); + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(topts.retval, 0, "test_run"); + + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test1)), 0, "test1_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test2)), 1, "test2_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test3)), 1, "test3_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test4)), 1, "test4_recursion_misses"); + +cleanup: + missed_tp_recursion__destroy(skel); +} + +void test_missed(void) +{ + if (test__start_subtest("perf_kprobe")) + test_missed_perf_kprobe(); + if (test__start_subtest("kprobe_recursion")) + test_missed_kprobe_recursion(); + if (test__start_subtest("tp_recursion")) + test_missed_tp_recursion(); +} diff --git a/tools/testing/selftests/bpf/progs/missed_kprobe.c b/tools/testing/selftests/bpf/progs/missed_kprobe.c new file mode 100644 index 000000000000..7f9ef701f5de --- /dev/null +++ b/tools/testing/selftests/bpf/progs/missed_kprobe.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> +#include "../bpf_testmod/bpf_testmod_kfunc.h" + +char _license[] SEC("license") = "GPL"; + +/* + * No tests in here, just to trigger 'bpf_fentry_test*' + * through tracing test_run + */ +SEC("fentry/bpf_modify_return_test") +int BPF_PROG(trigger) +{ + return 0; +} + +SEC("kprobe/bpf_fentry_test1") +int test1(struct pt_regs *ctx) +{ + bpf_kfunc_common_test(); + return 0; +} + +SEC("kprobe/bpf_kfunc_common_test") +int test2(struct pt_regs *ctx) +{ + return 0; +} diff --git a/tools/testing/selftests/bpf/progs/missed_kprobe_recursion.c b/tools/testing/selftests/bpf/progs/missed_kprobe_recursion.c new file mode 100644 index 000000000000..8ea71cbd6c45 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/missed_kprobe_recursion.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> +#include "../bpf_testmod/bpf_testmod_kfunc.h" + +char _license[] SEC("license") = "GPL"; + +/* + * No tests in here, just to trigger 'bpf_fentry_test*' + * through tracing test_run + */ +SEC("fentry/bpf_modify_return_test") +int BPF_PROG(trigger) +{ + return 0; +} + +SEC("kprobe.multi/bpf_fentry_test1") +int test1(struct pt_regs *ctx) +{ + bpf_kfunc_common_test(); + return 0; +} + +SEC("kprobe/bpf_kfunc_common_test") +int test2(struct pt_regs *ctx) +{ + return 0; +} + +SEC("kprobe/bpf_kfunc_common_test") +int test3(struct pt_regs *ctx) +{ + return 0; +} + +SEC("kprobe/bpf_kfunc_common_test") +int test4(struct pt_regs *ctx) +{ + return 0; +} + +SEC("kprobe.multi/bpf_kfunc_common_test") +int test5(struct pt_regs *ctx) +{ + return 0; +} diff --git a/tools/testing/selftests/bpf/progs/missed_tp_recursion.c b/tools/testing/selftests/bpf/progs/missed_tp_recursion.c new file mode 100644 index 000000000000..762385f827c5 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/missed_tp_recursion.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +/* + * No tests in here, just to trigger 'bpf_fentry_test*' + * through tracing test_run + */ +SEC("fentry/bpf_modify_return_test") +int BPF_PROG(trigger) +{ + return 0; +} + +SEC("kprobe/bpf_fentry_test1") +int test1(struct pt_regs *ctx) +{ + bpf_printk("test"); + return 0; +} + +SEC("tp/bpf_trace/bpf_trace_printk") +int test2(struct pt_regs *ctx) +{ + return 0; +} + +SEC("tp/bpf_trace/bpf_trace_printk") +int test3(struct pt_regs *ctx) +{ + return 0; +} + +SEC("tp/bpf_trace/bpf_trace_printk") +int test4(struct pt_regs *ctx) +{ + return 0; +} |