182 lines
6.4 KiB
C
182 lines
6.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include "test_attach_probe.skel.h"
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/* this is how USDT semaphore is actually defined, except volatile modifier */
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volatile unsigned short uprobe_ref_ctr __attribute__((unused)) __attribute((section(".probes")));
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/* uprobe attach point */
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static void trigger_func(void)
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{
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asm volatile ("");
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}
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/* attach point for byname uprobe */
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static void trigger_func2(void)
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{
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asm volatile ("");
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}
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void test_attach_probe(void)
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{
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DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
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struct bpf_link *kprobe_link, *kretprobe_link;
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struct bpf_link *uprobe_link, *uretprobe_link;
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struct test_attach_probe* skel;
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ssize_t uprobe_offset, ref_ctr_offset;
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struct bpf_link *uprobe_err_link;
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bool legacy;
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char *mem;
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/* Check if new-style kprobe/uprobe API is supported.
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* Kernels that support new FD-based kprobe and uprobe BPF attachment
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* through perf_event_open() syscall expose
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* /sys/bus/event_source/devices/kprobe/type and
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* /sys/bus/event_source/devices/uprobe/type files, respectively. They
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* contain magic numbers that are passed as "type" field of
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* perf_event_attr. Lack of such file in the system indicates legacy
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* kernel with old-style kprobe/uprobe attach interface through
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* creating per-probe event through tracefs. For such cases
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* ref_ctr_offset feature is not supported, so we don't test it.
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*/
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legacy = access("/sys/bus/event_source/devices/kprobe/type", F_OK) != 0;
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uprobe_offset = get_uprobe_offset(&trigger_func);
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if (!ASSERT_GE(uprobe_offset, 0, "uprobe_offset"))
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return;
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ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr);
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if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset"))
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return;
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skel = test_attach_probe__open_and_load();
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if (!ASSERT_OK_PTR(skel, "skel_open"))
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return;
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if (!ASSERT_OK_PTR(skel->bss, "check_bss"))
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goto cleanup;
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/* manual-attach kprobe/kretprobe */
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kprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kprobe,
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false /* retprobe */,
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SYS_NANOSLEEP_KPROBE_NAME);
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if (!ASSERT_OK_PTR(kprobe_link, "attach_kprobe"))
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goto cleanup;
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skel->links.handle_kprobe = kprobe_link;
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kretprobe_link = bpf_program__attach_kprobe(skel->progs.handle_kretprobe,
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true /* retprobe */,
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SYS_NANOSLEEP_KPROBE_NAME);
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if (!ASSERT_OK_PTR(kretprobe_link, "attach_kretprobe"))
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goto cleanup;
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skel->links.handle_kretprobe = kretprobe_link;
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/* auto-attachable kprobe and kretprobe */
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skel->links.handle_kprobe_auto = bpf_program__attach(skel->progs.handle_kprobe_auto);
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ASSERT_OK_PTR(skel->links.handle_kprobe_auto, "attach_kprobe_auto");
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skel->links.handle_kretprobe_auto = bpf_program__attach(skel->progs.handle_kretprobe_auto);
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ASSERT_OK_PTR(skel->links.handle_kretprobe_auto, "attach_kretprobe_auto");
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if (!legacy)
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ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_before");
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uprobe_opts.retprobe = false;
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uprobe_opts.ref_ctr_offset = legacy ? 0 : ref_ctr_offset;
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uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
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0 /* self pid */,
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"/proc/self/exe",
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uprobe_offset,
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&uprobe_opts);
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if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe"))
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goto cleanup;
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skel->links.handle_uprobe = uprobe_link;
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if (!legacy)
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ASSERT_GT(uprobe_ref_ctr, 0, "uprobe_ref_ctr_after");
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/* if uprobe uses ref_ctr, uretprobe has to use ref_ctr as well */
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uprobe_opts.retprobe = true;
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uprobe_opts.ref_ctr_offset = legacy ? 0 : ref_ctr_offset;
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uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe,
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-1 /* any pid */,
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"/proc/self/exe",
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uprobe_offset, &uprobe_opts);
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if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe"))
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goto cleanup;
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skel->links.handle_uretprobe = uretprobe_link;
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/* verify auto-attach fails for old-style uprobe definition */
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uprobe_err_link = bpf_program__attach(skel->progs.handle_uprobe_byname);
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if (!ASSERT_EQ(libbpf_get_error(uprobe_err_link), -EOPNOTSUPP,
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"auto-attach should fail for old-style name"))
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goto cleanup;
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uprobe_opts.func_name = "trigger_func2";
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uprobe_opts.retprobe = false;
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uprobe_opts.ref_ctr_offset = 0;
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skel->links.handle_uprobe_byname =
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bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe_byname,
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0 /* this pid */,
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"/proc/self/exe",
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0, &uprobe_opts);
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if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname, "attach_uprobe_byname"))
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goto cleanup;
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/* verify auto-attach works */
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skel->links.handle_uretprobe_byname =
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bpf_program__attach(skel->progs.handle_uretprobe_byname);
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if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname, "attach_uretprobe_byname"))
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goto cleanup;
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/* test attach by name for a library function, using the library
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* as the binary argument. libc.so.6 will be resolved via dlopen()/dlinfo().
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*/
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uprobe_opts.func_name = "malloc";
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uprobe_opts.retprobe = false;
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skel->links.handle_uprobe_byname2 =
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bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe_byname2,
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0 /* this pid */,
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"libc.so.6",
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0, &uprobe_opts);
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if (!ASSERT_OK_PTR(skel->links.handle_uprobe_byname2, "attach_uprobe_byname2"))
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goto cleanup;
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uprobe_opts.func_name = "free";
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uprobe_opts.retprobe = true;
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skel->links.handle_uretprobe_byname2 =
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bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe_byname2,
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-1 /* any pid */,
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"libc.so.6",
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0, &uprobe_opts);
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if (!ASSERT_OK_PTR(skel->links.handle_uretprobe_byname2, "attach_uretprobe_byname2"))
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goto cleanup;
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/* trigger & validate kprobe && kretprobe */
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usleep(1);
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/* trigger & validate shared library u[ret]probes attached by name */
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mem = malloc(1);
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free(mem);
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/* trigger & validate uprobe & uretprobe */
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trigger_func();
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/* trigger & validate uprobe attached by name */
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trigger_func2();
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ASSERT_EQ(skel->bss->kprobe_res, 1, "check_kprobe_res");
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ASSERT_EQ(skel->bss->kprobe2_res, 11, "check_kprobe_auto_res");
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ASSERT_EQ(skel->bss->kretprobe_res, 2, "check_kretprobe_res");
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ASSERT_EQ(skel->bss->kretprobe2_res, 22, "check_kretprobe_auto_res");
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ASSERT_EQ(skel->bss->uprobe_res, 3, "check_uprobe_res");
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ASSERT_EQ(skel->bss->uretprobe_res, 4, "check_uretprobe_res");
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ASSERT_EQ(skel->bss->uprobe_byname_res, 5, "check_uprobe_byname_res");
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ASSERT_EQ(skel->bss->uretprobe_byname_res, 6, "check_uretprobe_byname_res");
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ASSERT_EQ(skel->bss->uprobe_byname2_res, 7, "check_uprobe_byname2_res");
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ASSERT_EQ(skel->bss->uretprobe_byname2_res, 8, "check_uretprobe_byname2_res");
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cleanup:
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test_attach_probe__destroy(skel);
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ASSERT_EQ(uprobe_ref_ctr, 0, "uprobe_ref_ctr_cleanup");
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}
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