Commit 75b37157 authored by Jiri Olsa's avatar Jiri Olsa Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add uprobe_multi skel test 



Adding uprobe_multi test for skeleton load/attach functions,
to test skeleton auto attach for uprobe_multi link.

Test that bpf_get_func_ip works properly for uprobe_multi
attachment.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230809083440.3209381-20-jolsa@kernel.org


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 3830d04a

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

0 → 100644
+76 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



#include <unistd.h>

#include <test_progs.h>

#include "uprobe_multi.skel.h"



static char test_data[] = "test_data";



noinline void uprobe_multi_func_1(void)

{

	asm volatile ("");

}



noinline void uprobe_multi_func_2(void)

{

	asm volatile ("");

}



noinline void uprobe_multi_func_3(void)

{

	asm volatile ("");

}



static void uprobe_multi_test_run(struct uprobe_multi *skel)

{

	skel->bss->uprobe_multi_func_1_addr = (__u64) uprobe_multi_func_1;

	skel->bss->uprobe_multi_func_2_addr = (__u64) uprobe_multi_func_2;

	skel->bss->uprobe_multi_func_3_addr = (__u64) uprobe_multi_func_3;



	skel->bss->user_ptr = test_data;

	skel->bss->pid = getpid();



	/* trigger all probes */

	uprobe_multi_func_1();

	uprobe_multi_func_2();

	uprobe_multi_func_3();



	/*

	 * There are 2 entry and 2 exit probe called for each uprobe_multi_func_[123]

	 * function and each slepable probe (6) increments uprobe_multi_sleep_result.

	 */

	ASSERT_EQ(skel->bss->uprobe_multi_func_1_result, 2, "uprobe_multi_func_1_result");

	ASSERT_EQ(skel->bss->uprobe_multi_func_2_result, 2, "uprobe_multi_func_2_result");

	ASSERT_EQ(skel->bss->uprobe_multi_func_3_result, 2, "uprobe_multi_func_3_result");



	ASSERT_EQ(skel->bss->uretprobe_multi_func_1_result, 2, "uretprobe_multi_func_1_result");

	ASSERT_EQ(skel->bss->uretprobe_multi_func_2_result, 2, "uretprobe_multi_func_2_result");

	ASSERT_EQ(skel->bss->uretprobe_multi_func_3_result, 2, "uretprobe_multi_func_3_result");



	ASSERT_EQ(skel->bss->uprobe_multi_sleep_result, 6, "uprobe_multi_sleep_result");

}



static void test_skel_api(void)

{

	struct uprobe_multi *skel = NULL;

	int err;



	skel = uprobe_multi__open_and_load();

	if (!ASSERT_OK_PTR(skel, "uprobe_multi__open_and_load"))

		goto cleanup;



	err = uprobe_multi__attach(skel);

	if (!ASSERT_OK(err, "uprobe_multi__attach"))

		goto cleanup;



	uprobe_multi_test_run(skel);



cleanup:

	uprobe_multi__destroy(skel);

}



void test_uprobe_multi_test(void)

{

	if (test__start_subtest("skel_api"))

		test_skel_api();

}

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

0 → 100644
+91 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>

#include <stdbool.h>



char _license[] SEC("license") = "GPL";



__u64 uprobe_multi_func_1_addr = 0;

__u64 uprobe_multi_func_2_addr = 0;

__u64 uprobe_multi_func_3_addr = 0;



__u64 uprobe_multi_func_1_result = 0;

__u64 uprobe_multi_func_2_result = 0;

__u64 uprobe_multi_func_3_result = 0;



__u64 uretprobe_multi_func_1_result = 0;

__u64 uretprobe_multi_func_2_result = 0;

__u64 uretprobe_multi_func_3_result = 0;



__u64 uprobe_multi_sleep_result = 0;



int pid = 0;

bool test_cookie = false;

void *user_ptr = 0;



static __always_inline bool verify_sleepable_user_copy(void)

{

	char data[9];



	bpf_copy_from_user(data, sizeof(data), user_ptr);

	return bpf_strncmp(data, sizeof(data), "test_data") == 0;

}



static void uprobe_multi_check(void *ctx, bool is_return, bool is_sleep)

{

	if (bpf_get_current_pid_tgid() >> 32 != pid)

		return;



	__u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;

	__u64 addr = bpf_get_func_ip(ctx);



#define SET(__var, __addr, __cookie) ({			\

	if (addr == __addr &&				\

	   (!test_cookie || (cookie == __cookie)))	\

		__var += 1;				\

})



	if (is_return) {

		SET(uretprobe_multi_func_1_result, uprobe_multi_func_1_addr, 2);

		SET(uretprobe_multi_func_2_result, uprobe_multi_func_2_addr, 3);

		SET(uretprobe_multi_func_3_result, uprobe_multi_func_3_addr, 1);

	} else {

		SET(uprobe_multi_func_1_result, uprobe_multi_func_1_addr, 3);

		SET(uprobe_multi_func_2_result, uprobe_multi_func_2_addr, 1);

		SET(uprobe_multi_func_3_result, uprobe_multi_func_3_addr, 2);

	}



#undef SET



	if (is_sleep && verify_sleepable_user_copy())

		uprobe_multi_sleep_result += 1;

}



SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")

int uprobe(struct pt_regs *ctx)

{

	uprobe_multi_check(ctx, false, false);

	return 0;

}



SEC("uretprobe.multi//proc/self/exe:uprobe_multi_func_*")

int uretprobe(struct pt_regs *ctx)

{

	uprobe_multi_check(ctx, true, false);

	return 0;

}



SEC("uprobe.multi.s//proc/self/exe:uprobe_multi_func_*")

int uprobe_sleep(struct pt_regs *ctx)

{

	uprobe_multi_check(ctx, false, true);

	return 0;

}



SEC("uretprobe.multi.s//proc/self/exe:uprobe_multi_func_*")

int uretprobe_sleep(struct pt_regs *ctx)

{

	uprobe_multi_check(ctx, true, true);

	return 0;

}