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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include <test_progs.h>
#include <sys/types.h>
#include <unistd.h>
#include "find_vma.skel.h"
#include "find_vma_fail1.skel.h"
#include "find_vma_fail2.skel.h"
static void test_and_reset_skel(struct find_vma *skel, int expected_find_zero_ret)
{
ASSERT_EQ(skel->bss->found_vm_exec, 1, "found_vm_exec");
ASSERT_EQ(skel->data->find_addr_ret, 0, "find_addr_ret");
ASSERT_EQ(skel->data->find_zero_ret, expected_find_zero_ret, "find_zero_ret");
ASSERT_OK_PTR(strstr(skel->bss->d_iname, "test_progs"), "find_test_progs");
skel->bss->found_vm_exec = 0;
skel->data->find_addr_ret = -1;
skel->data->find_zero_ret = -1;
skel->bss->d_iname[0] = 0;
}
static int open_pe(void)
{
struct perf_event_attr attr = {0};
int pfd;
/* create perf event */
attr.size = sizeof(attr);
attr.type = PERF_TYPE_HARDWARE;
attr.config = PERF_COUNT_HW_CPU_CYCLES;
attr.freq = 1;
attr.sample_freq = 4000;
pfd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, PERF_FLAG_FD_CLOEXEC);
return pfd >= 0 ? pfd : -errno;
}
static void test_find_vma_pe(struct find_vma *skel)
{
struct bpf_link *link = NULL;
volatile int j = 0;
int pfd, i;
pfd = open_pe();
if (pfd < 0) {
if (pfd == -ENOENT || pfd == -EOPNOTSUPP) {
printf("%s:SKIP:no PERF_COUNT_HW_CPU_CYCLES\n", __func__);
test__skip();
goto cleanup;
}
if (!ASSERT_GE(pfd, 0, "perf_event_open"))
goto cleanup;
}
link = bpf_program__attach_perf_event(skel->progs.handle_pe, pfd);
if (!ASSERT_OK_PTR(link, "attach_perf_event"))
goto cleanup;
for (i = 0; i < 1000000; ++i)
++j;
test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */);
cleanup:
bpf_link__destroy(link);
close(pfd);
}
static void test_find_vma_kprobe(struct find_vma *skel)
{
int err;
err = find_vma__attach(skel);
if (!ASSERT_OK(err, "get_branch_snapshot__attach"))
return;
getpgid(skel->bss->target_pid);
test_and_reset_skel(skel, -ENOENT /* could not find vma for ptr 0 */);
}
static void test_illegal_write_vma(void)
{
struct find_vma_fail1 *skel;
skel = find_vma_fail1__open_and_load();
if (!ASSERT_ERR_PTR(skel, "find_vma_fail1__open_and_load"))
find_vma_fail1__destroy(skel);
}
static void test_illegal_write_task(void)
{
struct find_vma_fail2 *skel;
skel = find_vma_fail2__open_and_load();
if (!ASSERT_ERR_PTR(skel, "find_vma_fail2__open_and_load"))
find_vma_fail2__destroy(skel);
}
void serial_test_find_vma(void)
{
struct find_vma *skel;
skel = find_vma__open_and_load();
if (!ASSERT_OK_PTR(skel, "find_vma__open_and_load"))
return;
skel->bss->target_pid = getpid();
skel->bss->addr = (__u64)(uintptr_t)test_find_vma_pe;
test_find_vma_pe(skel);
usleep(100000); /* allow the irq_work to finish */
test_find_vma_kprobe(skel);
find_vma__destroy(skel);
test_illegal_write_vma();
test_illegal_write_task();
}
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