From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- mm/rodata_test.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 mm/rodata_test.c (limited to 'mm/rodata_test.c') diff --git a/mm/rodata_test.c b/mm/rodata_test.c new file mode 100644 index 000000000..261337194 --- /dev/null +++ b/mm/rodata_test.c @@ -0,0 +1,54 @@ +// 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 + */ +#define pr_fmt(fmt) "rodata_test: " fmt + +#include +#include +#include + +static const int rodata_test_data = 0xC3; + +void rodata_test(void) +{ + unsigned long start, end; + int zero = 0; + + /* test 1: read the value */ + /* If this test fails, some previous testrun has clobbered the state */ + if (!rodata_test_data) { + 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 (rodata_test_data == zero) { + pr_err("test data was changed\n"); + return; + } + + /* test 4: check if the rodata section is PAGE_SIZE aligned */ + start = (unsigned long)__start_rodata; + end = (unsigned long)__end_rodata; + if (start & (PAGE_SIZE - 1)) { + pr_err("start of .rodata is not page size aligned\n"); + return; + } + if (end & (PAGE_SIZE - 1)) { + pr_err("end of .rodata is not page size aligned\n"); + return; + } + + pr_info("all tests were successful\n"); +} -- cgit v1.2.3