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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354// SPDX-License-Identifier: GPL-2.0-only/* * rodata_test.c: functional test for mark_rodata_ro function * * (C) Copyright 2008 Intel Corporation * Author: Arjan van de Ven <arjan@linux.intel.com> */#define pr_fmt(fmt) "rodata_test: " fmt
#include <linux/rodata_test.h>#include <linux/uaccess.h>#include <linux/mm.h>#include <asm/sections.h>
#define TEST_VALUE 0xC3static const int rodata_test_data = TEST_VALUE;
void rodata_test(void){ int zero = 0;
/* test 1: read the value */ /* If this test fails, some previous testrun has clobbered the state */ if (unlikely(READ_ONCE(rodata_test_data) != TEST_VALUE)) { pr_err("test 1 fails (start data)\n"); return; }
/* test 2: write to the variable; this should fault */ if (!copy_to_kernel_nofault((void *)&rodata_test_data, (void *)&zero, sizeof(zero))) { pr_err("test data was not read only\n"); return; }
/* test 3: check the value hasn't changed */ if (unlikely(READ_ONCE(rodata_test_data) != TEST_VALUE)) { pr_err("test data was changed\n"); return; }
/* test 4: check if the rodata section is PAGE_SIZE aligned */ if (!PAGE_ALIGNED(__start_rodata)) { pr_err("start of .rodata is not page size aligned\n"); return; } if (!PAGE_ALIGNED(__end_rodata)) { pr_err("end of .rodata is not page size aligned\n"); return; }
pr_info("all tests were successful\n");}