diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2025-09-16 23:52:59 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-09-24 02:25:06 -0700 |
| commit | 6a4ea0d1cb4408a7ca8ad0d12bd1d08a35838160 (patch) | |
| tree | f6f3cb125201795e06053063d7ad7f10b4f0b233 /tools | |
| parent | selftests/bpf: Add uprobe context registers changes test (diff) | |
| download | linux-6a4ea0d1cb4408a7ca8ad0d12bd1d08a35838160.tar.gz linux-6a4ea0d1cb4408a7ca8ad0d12bd1d08a35838160.zip | |
selftests/bpf: Add uprobe context ip register change test
Adding test to check we can change the application execution
through instruction pointer change through uprobe program.
It's x86_64 specific test.
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20250916215301.664963-5-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/uprobe.c | 42 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_uprobe.c | 14 |
2 files changed, 56 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe.c b/tools/testing/selftests/bpf/prog_tests/uprobe.c index 19dd900df188..86404476c1da 100644 --- a/tools/testing/selftests/bpf/prog_tests/uprobe.c +++ b/tools/testing/selftests/bpf/prog_tests/uprobe.c @@ -190,10 +190,52 @@ cleanup: test_uprobe__destroy(skel); } +static noinline unsigned long uprobe_regs_change_ip_1(void) +{ + return 0xc0ffee; +} + +static noinline unsigned long uprobe_regs_change_ip_2(void) +{ + return 0xdeadbeef; +} + +static void regs_ip(void) +{ + LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts); + struct test_uprobe *skel; + unsigned long ret; + + skel = test_uprobe__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + skel->bss->my_pid = getpid(); + skel->bss->ip = (unsigned long) uprobe_regs_change_ip_2; + + uprobe_opts.func_name = "uprobe_regs_change_ip_1"; + skel->links.test_regs_change_ip = bpf_program__attach_uprobe_opts( + skel->progs.test_regs_change_ip, + -1, + "/proc/self/exe", + 0 /* offset */, + &uprobe_opts); + if (!ASSERT_OK_PTR(skel->links.test_regs_change_ip, "bpf_program__attach_uprobe_opts")) + goto cleanup; + + ret = uprobe_regs_change_ip_1(); + ASSERT_EQ(ret, 0xdeadbeef, "ret"); + +cleanup: + test_uprobe__destroy(skel); +} + static void test_uprobe_regs_change(void) { if (test__start_subtest("regs_change_common")) regs_common(); + if (test__start_subtest("regs_change_ip")) + regs_ip(); } #else static void test_uprobe_regs_change(void) { } diff --git a/tools/testing/selftests/bpf/progs/test_uprobe.c b/tools/testing/selftests/bpf/progs/test_uprobe.c index 9437bd76a437..12f4065fca20 100644 --- a/tools/testing/selftests/bpf/progs/test_uprobe.c +++ b/tools/testing/selftests/bpf/progs/test_uprobe.c @@ -82,4 +82,18 @@ int BPF_UPROBE(test_regs_change) ctx->si = regs.si; return 0; } + +unsigned long ip; + +SEC("uprobe") +int BPF_UPROBE(test_regs_change_ip) +{ + pid_t pid = bpf_get_current_pid_tgid() >> 32; + + if (pid != my_pid) + return 0; + + ctx->ip = ip; + return 0; +} #endif |