116 lines
2.2 KiB
C
116 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Google LLC.
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*/
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#include <test_progs.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <malloc.h>
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#include <stdlib.h>
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#include "lsm.skel.h"
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char *CMD_ARGS[] = {"true", NULL};
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#define GET_PAGE_ADDR(ADDR, PAGE_SIZE) \
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(char *)(((unsigned long) (ADDR + PAGE_SIZE)) & ~(PAGE_SIZE-1))
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int stack_mprotect(void)
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{
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void *buf;
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long sz;
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int ret;
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sz = sysconf(_SC_PAGESIZE);
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if (sz < 0)
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return sz;
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buf = alloca(sz * 3);
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ret = mprotect(GET_PAGE_ADDR(buf, sz), sz,
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PROT_READ | PROT_WRITE | PROT_EXEC);
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return ret;
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}
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int exec_cmd(int *monitored_pid)
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{
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int child_pid, child_status;
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child_pid = fork();
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if (child_pid == 0) {
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*monitored_pid = getpid();
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execvp(CMD_ARGS[0], CMD_ARGS);
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return -EINVAL;
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} else if (child_pid > 0) {
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waitpid(child_pid, &child_status, 0);
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return child_status;
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}
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return -EINVAL;
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}
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static int test_lsm(struct lsm *skel)
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{
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struct bpf_link *link;
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int buf = 1234;
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int err;
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err = lsm__attach(skel);
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if (!ASSERT_OK(err, "attach"))
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return err;
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/* Check that already linked program can't be attached again. */
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link = bpf_program__attach(skel->progs.test_int_hook);
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if (!ASSERT_ERR_PTR(link, "attach_link"))
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return -1;
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err = exec_cmd(&skel->bss->monitored_pid);
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if (!ASSERT_OK(err, "exec_cmd"))
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return err;
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ASSERT_EQ(skel->bss->bprm_count, 1, "bprm_count");
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skel->bss->monitored_pid = getpid();
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err = stack_mprotect();
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if (!ASSERT_EQ(errno, EPERM, "stack_mprotect"))
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return err;
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ASSERT_EQ(skel->bss->mprotect_count, 1, "mprotect_count");
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syscall(__NR_setdomainname, &buf, -2L);
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syscall(__NR_setdomainname, 0, -3L);
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syscall(__NR_setdomainname, ~0L, -4L);
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ASSERT_EQ(skel->bss->copy_test, 3, "copy_test");
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lsm__detach(skel);
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skel->bss->copy_test = 0;
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skel->bss->bprm_count = 0;
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skel->bss->mprotect_count = 0;
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return 0;
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}
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void test_test_lsm(void)
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{
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struct lsm *skel = NULL;
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int err;
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skel = lsm__open_and_load();
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if (!ASSERT_OK_PTR(skel, "lsm_skel_load"))
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goto close_prog;
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err = test_lsm(skel);
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if (!ASSERT_OK(err, "test_lsm_first_attach"))
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goto close_prog;
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err = test_lsm(skel);
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ASSERT_OK(err, "test_lsm_second_attach");
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close_prog:
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lsm__destroy(skel);
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}
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