From 579c3196b21800538e0cfd512a05619ee80fb19a Mon Sep 17 00:00:00 2001 From: Alan Maguire Date: Wed, 30 Mar 2022 16:26:40 +0100 Subject: [PATCH] selftests/bpf: Add tests for uprobe auto-attach via skeleton tests that verify auto-attach works for function entry/return for local functions in program and library functions in a library. Signed-off-by: Alan Maguire Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/1648654000-21758-6-git-send-email-alan.maguire@oracle.com --- .../selftests/bpf/prog_tests/uprobe_autoattach.c | 38 ++++++++++++++++ .../selftests/bpf/progs/test_uprobe_autoattach.c | 52 ++++++++++++++++++++++ 2 files changed, 90 insertions(+) create mode 100644 tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c create mode 100644 tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c new file mode 100644 index 0000000..03b15d6 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c @@ -0,0 +1,38 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022, Oracle and/or its affiliates. */ + +#include +#include "test_uprobe_autoattach.skel.h" + +/* uprobe attach point */ +static void autoattach_trigger_func(void) +{ + asm volatile (""); +} + +void test_uprobe_autoattach(void) +{ + struct test_uprobe_autoattach *skel; + char *mem; + + skel = test_uprobe_autoattach__open_and_load(); + if (!ASSERT_OK_PTR(skel, "skel_open")) + return; + + if (!ASSERT_OK(test_uprobe_autoattach__attach(skel), "skel_attach")) + goto cleanup; + + /* trigger & validate uprobe & uretprobe */ + autoattach_trigger_func(); + + /* trigger & validate shared library u[ret]probes attached by name */ + mem = malloc(1); + free(mem); + + ASSERT_EQ(skel->bss->uprobe_byname_res, 1, "check_uprobe_byname_res"); + ASSERT_EQ(skel->bss->uretprobe_byname_res, 2, "check_uretprobe_byname_res"); + ASSERT_EQ(skel->bss->uprobe_byname2_res, 3, "check_uprobe_byname2_res"); + ASSERT_EQ(skel->bss->uretprobe_byname2_res, 4, "check_uretprobe_byname2_res"); +cleanup: + test_uprobe_autoattach__destroy(skel); +} diff --git a/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c b/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c new file mode 100644 index 0000000..b442fb5 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2022, Oracle and/or its affiliates. */ + +#include +#include +#include +#include + +int uprobe_byname_res = 0; +int uretprobe_byname_res = 0; +int uprobe_byname2_res = 0; +int uretprobe_byname2_res = 0; + +/* This program cannot auto-attach, but that should not stop other + * programs from attaching. + */ +SEC("uprobe") +int handle_uprobe_noautoattach(struct pt_regs *ctx) +{ + return 0; +} + +SEC("uprobe//proc/self/exe:autoattach_trigger_func") +int handle_uprobe_byname(struct pt_regs *ctx) +{ + uprobe_byname_res = 1; + return 0; +} + +SEC("uretprobe//proc/self/exe:autoattach_trigger_func") +int handle_uretprobe_byname(struct pt_regs *ctx) +{ + uretprobe_byname_res = 2; + return 0; +} + + +SEC("uprobe/libc.so.6:malloc") +int handle_uprobe_byname2(struct pt_regs *ctx) +{ + uprobe_byname2_res = 3; + return 0; +} + +SEC("uretprobe/libc.so.6:free") +int handle_uretprobe_byname2(struct pt_regs *ctx) +{ + uretprobe_byname2_res = 4; + return 0; +} + +char _license[] SEC("license") = "GPL"; -- 2.7.4