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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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4939b2847d
Nearly every user of cgroup helpers does the same sequence of API calls. So push these into a single helper cgroup_setup_and_join. The cases that do a bit of extra logic are test_progs which currently uses an env variable to decide if it needs to setup the cgroup environment or can use an existingi environment. And then tests that are doing cgroup tests themselves. We skip these cases for now. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/159623335418.30208.15807461815525100199.stgit@john-XPS-13-9370
82 lines
2 KiB
C
82 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Facebook
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/time.h>
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#include <linux/bpf.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "cgroup_helpers.h"
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#include "bpf_rlimit.h"
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#define DEV_CGROUP_PROG "./dev_cgroup.o"
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#define TEST_CGROUP "/test-bpf-based-device-cgroup/"
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int main(int argc, char **argv)
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{
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struct bpf_object *obj;
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int error = EXIT_FAILURE;
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int prog_fd, cgroup_fd;
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__u32 prog_cnt;
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if (bpf_prog_load(DEV_CGROUP_PROG, BPF_PROG_TYPE_CGROUP_DEVICE,
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&obj, &prog_fd)) {
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printf("Failed to load DEV_CGROUP program\n");
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goto out;
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}
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cgroup_fd = cgroup_setup_and_join(TEST_CGROUP);
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if (cgroup_fd < 0) {
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printf("Failed to create test cgroup\n");
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goto out;
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}
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/* Attach bpf program */
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if (bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_DEVICE, 0)) {
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printf("Failed to attach DEV_CGROUP program");
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goto err;
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}
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if (bpf_prog_query(cgroup_fd, BPF_CGROUP_DEVICE, 0, NULL, NULL,
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&prog_cnt)) {
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printf("Failed to query attached programs");
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goto err;
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}
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/* All operations with /dev/zero and and /dev/urandom are allowed,
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* everything else is forbidden.
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*/
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assert(system("rm -f /tmp/test_dev_cgroup_null") == 0);
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assert(system("mknod /tmp/test_dev_cgroup_null c 1 3"));
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assert(system("rm -f /tmp/test_dev_cgroup_null") == 0);
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/* /dev/zero is whitelisted */
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assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0);
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assert(system("mknod /tmp/test_dev_cgroup_zero c 1 5") == 0);
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assert(system("rm -f /tmp/test_dev_cgroup_zero") == 0);
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assert(system("dd if=/dev/urandom of=/dev/zero count=64") == 0);
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/* src is allowed, target is forbidden */
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assert(system("dd if=/dev/urandom of=/dev/full count=64"));
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/* src is forbidden, target is allowed */
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assert(system("dd if=/dev/random of=/dev/zero count=64"));
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error = 0;
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printf("test_dev_cgroup:PASS\n");
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err:
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cleanup_cgroup_environment();
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out:
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return error;
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}
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