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selftests/bpf: Add uprobe_multi skel test

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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: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20230809083440.3209381-20-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2023-08-09 10:34:31 +02:00 committed by Alexei Starovoitov
parent 3830d04a74
commit 75b3715720
2 changed files with 167 additions and 0 deletions
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76
tools/testing/selftests/bpf/prog_tests/uprobe_multi_test.c Normal file
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// 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();
}

91
tools/testing/selftests/bpf/progs/uprobe_multi.c Normal file
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// 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;
}