Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#define _GNU_SOURCE
#include <sched.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <test_progs.h>
 
#define TDIR "/sys/kernel/debug"
 
static int read_iter(char *file)
{
<------>/* 1024 should be enough to get contiguous 4 "iter" letters at some point */
<------>char buf[1024];
<------>int fd, len;
 
<------>fd = open(file, 0);
<------>if (fd < 0)
<------><------>return -1;
<------>while ((len = read(fd, buf, sizeof(buf))) > 0)
<------><------>if (strstr(buf, "iter")) {
<------><------><------>close(fd);
<------><------><------>return 0;
<------><------>}
<------>close(fd);
<------>return -1;
}
 
static int fn(void)
{
<------>int err, duration = 0;
 
<------>err = unshare(CLONE_NEWNS);
<------>if (CHECK(err, "unshare", "failed: %d\n", errno))
<------><------>goto out;
 
<------>err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL);
<------>if (CHECK(err, "mount /", "failed: %d\n", errno))
<------><------>goto out;
 
<------>err = umount(TDIR);
<------>if (CHECK(err, "umount " TDIR, "failed: %d\n", errno))
<------><------>goto out;
 
<------>err = mount("none", TDIR, "tmpfs", 0, NULL);
<------>if (CHECK(err, "mount", "mount root failed: %d\n", errno))
<------><------>goto out;
 
<------>err = mkdir(TDIR "/fs1", 0777);
<------>if (CHECK(err, "mkdir "TDIR"/fs1", "failed: %d\n", errno))
<------><------>goto out;
<------>err = mkdir(TDIR "/fs2", 0777);
<------>if (CHECK(err, "mkdir "TDIR"/fs2", "failed: %d\n", errno))
<------><------>goto out;
 
<------>err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL);
<------>if (CHECK(err, "mount bpffs "TDIR"/fs1", "failed: %d\n", errno))
<------><------>goto out;
<------>err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL);
<------>if (CHECK(err, "mount bpffs " TDIR "/fs2", "failed: %d\n", errno))
<------><------>goto out;
 
<------>err = read_iter(TDIR "/fs1/maps.debug");
<------>if (CHECK(err, "reading " TDIR "/fs1/maps.debug", "failed\n"))
<------><------>goto out;
<------>err = read_iter(TDIR "/fs2/progs.debug");
<------>if (CHECK(err, "reading " TDIR "/fs2/progs.debug", "failed\n"))
<------><------>goto out;
out:
<------>umount(TDIR "/fs1");
<------>umount(TDIR "/fs2");
<------>rmdir(TDIR "/fs1");
<------>rmdir(TDIR "/fs2");
<------>umount(TDIR);
<------>exit(err);
}
 
void test_test_bpffs(void)
{
<------>int err, duration = 0, status = 0;
<------>pid_t pid;
 
<------>pid = fork();
<------>if (CHECK(pid == -1, "clone", "clone failed %d", errno))
<------><------>return;
<------>if (pid == 0)
<------><------>fn();
<------>err = waitpid(pid, &status, 0);
<------>if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno))
<------><------>return;
<------>if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status)))
<------><------>return;
}