98 lines
3.2 KiB
C
98 lines
3.2 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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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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int duration = 0;
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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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size_t uprobe_offset;
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ssize_t base_addr, ref_ctr_offset;
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base_addr = get_base_addr();
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if (CHECK(base_addr < 0, "get_base_addr",
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"failed to find base addr: %zd", base_addr))
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return;
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uprobe_offset = get_uprobe_offset(&get_base_addr, base_addr);
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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 (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
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return;
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if (CHECK(!skel->bss, "check_bss", ".bss wasn't mmap()-ed\n"))
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goto cleanup;
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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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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 = 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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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 = 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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/* trigger & validate kprobe && kretprobe */
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usleep(1);
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if (CHECK(skel->bss->kprobe_res != 1, "check_kprobe_res",
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"wrong kprobe res: %d\n", skel->bss->kprobe_res))
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goto cleanup;
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if (CHECK(skel->bss->kretprobe_res != 2, "check_kretprobe_res",
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"wrong kretprobe res: %d\n", skel->bss->kretprobe_res))
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goto cleanup;
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/* trigger & validate uprobe & uretprobe */
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get_base_addr();
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if (CHECK(skel->bss->uprobe_res != 3, "check_uprobe_res",
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"wrong uprobe res: %d\n", skel->bss->uprobe_res))
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goto cleanup;
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if (CHECK(skel->bss->uretprobe_res != 4, "check_uretprobe_res",
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"wrong uretprobe res: %d\n", skel->bss->uretprobe_res))
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goto cleanup;
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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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