1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include "test_attach_probe.skel.h" 4 5 /* this is how USDT semaphore is actually defined, except volatile modifier */ 6 volatile unsigned short uprobe_ref_ctr __attribute__((unused)) __attribute((section(".probes"))); 7 8 void test_attach_probe(void) 9 { 10 DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts); 11 int duration = 0; 12 struct bpf_link *kprobe_link, *kretprobe_link; 13 struct bpf_link *uprobe_link, *uretprobe_link; 14 struct test_attach_probe* skel; 15 size_t uprobe_offset; 16 ssize_t base_addr, ref_ctr_offset; 17 18 base_addr = get_base_addr(); 19 if (CHECK(base_addr < 0, "get_base_addr", 20 "failed to find base addr: %zd", base_addr)) 21 return; 22 uprobe_offset = get_uprobe_offset(&get_base_addr, base_addr); 23 24 ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr); 25 if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset")) 26 return; 27 28 skel = test_attach_probe__open_and_load(); 29 if (CHECK(!skel, "skel_open", "failed to open skeleton\n")) 30 return; 31 if (CHECK(!skel->bss, "check_bss", ".bss wasn't mmap()-ed\n")) 32 goto cleanup; 33 34 kprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kprobe, 35 false /* retprobe */, 36 SYS_NANOSLEEP_KPROBE_NAME); 37 if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe")) 38 goto cleanup; 39 skel->links.handle_kprobe = kprobe_link; 40 41 kretprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kretprobe, 42 true /* retprobe */, 43 SYS_NANOSLEEP_KPROBE_NAME); 44 if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe")) 45 goto cleanup; 46 skel->links.handle_kretprobe = kretprobe_link; 47 48 ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before"); 49 50 uprobe_opts.retprobe = false; 51 uprobe_opts.ref_ctr_offset = ref_ctr_offset; 52 uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe, 53 0 /* self pid */, 54 "/proc/self/exe", 55 uprobe_offset, 56 &uprobe_opts); 57 if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe")) 58 goto cleanup; 59 skel->links.handle_uprobe = uprobe_link; 60 61 ASSERT_GT(uprobe_ref_ctr, 0, "uprobe_ref_ctr_after"); 62 63 /* if uprobe uses ref_ctr, uretprobe has to use ref_ctr as well */ 64 uprobe_opts.retprobe = true; 65 uprobe_opts.ref_ctr_offset = ref_ctr_offset; 66 uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe, 67 -1 /* any pid */, 68 "/proc/self/exe", 69 uprobe_offset, &uprobe_opts); 70 if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe")) 71 goto cleanup; 72 skel->links.handle_uretprobe = uretprobe_link; 73 74 /* trigger & validate kprobe && kretprobe */ 75 usleep(1); 76 77 if (CHECK(skel->bss->kprobe_res != 1, "check_kprobe_res", 78 "wrong kprobe res: %d\n", skel->bss->kprobe_res)) 79 goto cleanup; 80 if (CHECK(skel->bss->kretprobe_res != 2, "check_kretprobe_res", 81 "wrong kretprobe res: %d\n", skel->bss->kretprobe_res)) 82 goto cleanup; 83 84 /* trigger & validate uprobe & uretprobe */ 85 get_base_addr(); 86 87 if (CHECK(skel->bss->uprobe_res != 3, "check_uprobe_res", 88 "wrong uprobe res: %d\n", skel->bss->uprobe_res)) 89 goto cleanup; 90 if (CHECK(skel->bss->uretprobe_res != 4, "check_uretprobe_res", 91 "wrong uretprobe res: %d\n", skel->bss->uretprobe_res)) 92 goto cleanup; 93 94 cleanup: 95 test_attach_probe__destroy(skel); 96 ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_cleanup"); 97 } 98