103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <test_progs.h>
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#include "test_deny_namespace.skel.h"
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#include <sched.h>
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#include "cap_helpers.h"
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#include <stdio.h>
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static int wait_for_pid(pid_t pid)
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{
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int status, ret;
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again:
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ret = waitpid(pid, &status, 0);
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if (ret == -1) {
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if (errno == EINTR)
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goto again;
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return -1;
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}
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if (!WIFEXITED(status))
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return -1;
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return WEXITSTATUS(status);
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}
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/* negative return value -> some internal error
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* positive return value -> userns creation failed
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* 0 -> userns creation succeeded
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*/
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static int create_user_ns(void)
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{
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pid_t pid;
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pid = fork();
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if (pid < 0)
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return -1;
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if (pid == 0) {
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if (unshare(CLONE_NEWUSER))
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_exit(EXIT_FAILURE);
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_exit(EXIT_SUCCESS);
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}
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return wait_for_pid(pid);
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}
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static void test_userns_create_bpf(void)
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{
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__u32 cap_mask = 1ULL << CAP_SYS_ADMIN;
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__u64 old_caps = 0;
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cap_enable_effective(cap_mask, &old_caps);
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ASSERT_OK(create_user_ns(), "priv new user ns");
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cap_disable_effective(cap_mask, &old_caps);
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ASSERT_EQ(create_user_ns(), EPERM, "unpriv new user ns");
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if (cap_mask & old_caps)
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cap_enable_effective(cap_mask, NULL);
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}
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static void test_unpriv_userns_create_no_bpf(void)
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{
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__u32 cap_mask = 1ULL << CAP_SYS_ADMIN;
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__u64 old_caps = 0;
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cap_disable_effective(cap_mask, &old_caps);
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ASSERT_OK(create_user_ns(), "no-bpf unpriv new user ns");
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if (cap_mask & old_caps)
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cap_enable_effective(cap_mask, NULL);
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}
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void test_deny_namespace(void)
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{
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struct test_deny_namespace *skel = NULL;
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int err;
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if (test__start_subtest("unpriv_userns_create_no_bpf"))
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test_unpriv_userns_create_no_bpf();
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skel = test_deny_namespace__open_and_load();
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if (!ASSERT_OK_PTR(skel, "skel load"))
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goto close_prog;
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err = test_deny_namespace__attach(skel);
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if (!ASSERT_OK(err, "attach"))
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goto close_prog;
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if (test__start_subtest("userns_create_bpf"))
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test_userns_create_bpf();
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test_deny_namespace__detach(skel);
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close_prog:
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test_deny_namespace__destroy(skel);
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}
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