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edb65ee5aa
Add a test that mounts two bpffs instances and checks progs.debug and maps.debug for sanity data. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20200819042759.51280-5-alexei.starovoitov@gmail.com
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#define _GNU_SOURCE
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#include <sched.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <test_progs.h>
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#define TDIR "/sys/kernel/debug"
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static int read_iter(char *file)
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{
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/* 1024 should be enough to get contiguous 4 "iter" letters at some point */
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char buf[1024];
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int fd, len;
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fd = open(file, 0);
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if (fd < 0)
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return -1;
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while ((len = read(fd, buf, sizeof(buf))) > 0)
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if (strstr(buf, "iter")) {
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close(fd);
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return 0;
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}
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close(fd);
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return -1;
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}
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static int fn(void)
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{
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int err, duration = 0;
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err = unshare(CLONE_NEWNS);
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if (CHECK(err, "unshare", "failed: %d\n", errno))
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goto out;
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err = mount("", "/", "", MS_REC | MS_PRIVATE, NULL);
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if (CHECK(err, "mount /", "failed: %d\n", errno))
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goto out;
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err = umount(TDIR);
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if (CHECK(err, "umount " TDIR, "failed: %d\n", errno))
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goto out;
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err = mount("none", TDIR, "tmpfs", 0, NULL);
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if (CHECK(err, "mount", "mount root failed: %d\n", errno))
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goto out;
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err = mkdir(TDIR "/fs1", 0777);
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if (CHECK(err, "mkdir "TDIR"/fs1", "failed: %d\n", errno))
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goto out;
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err = mkdir(TDIR "/fs2", 0777);
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if (CHECK(err, "mkdir "TDIR"/fs2", "failed: %d\n", errno))
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goto out;
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err = mount("bpf", TDIR "/fs1", "bpf", 0, NULL);
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if (CHECK(err, "mount bpffs "TDIR"/fs1", "failed: %d\n", errno))
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goto out;
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err = mount("bpf", TDIR "/fs2", "bpf", 0, NULL);
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if (CHECK(err, "mount bpffs " TDIR "/fs2", "failed: %d\n", errno))
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goto out;
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err = read_iter(TDIR "/fs1/maps.debug");
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if (CHECK(err, "reading " TDIR "/fs1/maps.debug", "failed\n"))
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goto out;
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err = read_iter(TDIR "/fs2/progs.debug");
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if (CHECK(err, "reading " TDIR "/fs2/progs.debug", "failed\n"))
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goto out;
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out:
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umount(TDIR "/fs1");
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umount(TDIR "/fs2");
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rmdir(TDIR "/fs1");
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rmdir(TDIR "/fs2");
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umount(TDIR);
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exit(err);
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}
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void test_test_bpffs(void)
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{
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int err, duration = 0, status = 0;
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pid_t pid;
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pid = fork();
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if (CHECK(pid == -1, "clone", "clone failed %d", errno))
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return;
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if (pid == 0)
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fn();
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err = waitpid(pid, &status, 0);
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if (CHECK(err == -1 && errno != ECHILD, "waitpid", "failed %d", errno))
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return;
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if (CHECK(WEXITSTATUS(status), "bpffs test ", "failed %d", WEXITSTATUS(status)))
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return;
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}
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