Commit 579c3196 authored by Alan Maguire's avatar Alan Maguire Committed by Andrii Nakryiko
Browse files

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: default avatarAlan Maguire <alan.maguire@oracle.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/1648654000-21758-6-git-send-email-alan.maguire@oracle.com
parent ba7499bc

tools/testing/selftests/bpf/prog_tests/uprobe_autoattach.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2022, Oracle and/or its affiliates. */



#include <test_progs.h>

#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);

}

tools/testing/selftests/bpf/progs/test_uprobe_autoattach.c

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// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2022, Oracle and/or its affiliates. */



#include <linux/ptrace.h>

#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>



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";