Adding test to check we can change the application execution through instruction pointer change through uprobe program.
It's x86_64 specific test. Signed-off-by: Jiri Olsa <[email protected]> --- .../bpf/prog_tests/uprobe_multi_test.c | 42 +++++++++++++++++++ .../selftests/bpf/progs/uprobe_multi.c | 14 +++++++ 2 files changed, 56 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c index 012652b07399..4630a6c65c3c 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c @@ -1437,10 +1437,52 @@ static void unique_regs_common(void) uprobe_multi__destroy(skel); } +noinline static unsigned long uprobe_regs_change_ip_1(void) +{ + return 0xc0ffee; +} + +noinline static unsigned long uprobe_regs_change_ip_2(void) +{ + return 0xdeadbeef; +} + +static void unique_regs_ip(void) +{ + LIBBPF_OPTS(bpf_uprobe_multi_opts, opts, + .unique = true, + ); + struct uprobe_multi *skel; + int ret; + + skel = uprobe_multi__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + skel->bss->pid = getpid(); + skel->bss->ip = (unsigned long) uprobe_regs_change_ip_2; + + skel->links.uprobe_change_ip = bpf_program__attach_uprobe_multi( + skel->progs.uprobe_change_ip, + -1, "/proc/self/exe", + "uprobe_regs_change_ip_1", + &opts); + if (!ASSERT_OK_PTR(skel->links.uprobe_change_ip, "bpf_program__attach_uprobe_multi")) + goto cleanup; + + ret = uprobe_regs_change_ip_1(); + ASSERT_EQ(ret, 0xdeadbeef, "ret"); + +cleanup: + uprobe_multi__destroy(skel); +} + static void test_unique(void) { if (test__start_subtest("unique_regs_common")) unique_regs_common(); + if (test__start_subtest("unique_regs_ip")) + unique_regs_ip(); } #else static void test_unique(void) { } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi.c b/tools/testing/selftests/bpf/progs/uprobe_multi.c index f26f8b840985..563fd37ed77d 100644 --- a/tools/testing/selftests/bpf/progs/uprobe_multi.c +++ b/tools/testing/selftests/bpf/progs/uprobe_multi.c @@ -164,4 +164,18 @@ int BPF_UPROBE(uprobe_change_regs) ctx->si = regs.si; return 0; } + +unsigned long ip; + +SEC("uprobe.unique") +int BPF_UPROBE(uprobe_change_ip) +{ + pid_t cur_pid = bpf_get_current_pid_tgid() >> 32; + + if (cur_pid != pid) + return 0; + + ctx->ip = ip; + return 0; +} #endif -- 2.51.0
