From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- mm/rodata_test.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 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..6d7834369 --- /dev/null +++ b/mm/rodata_test.c @@ -0,0 +1,52 @@ +// 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 +#include + +static const int rodata_test_data = 0xC3; + +void rodata_test(void) +{ + 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 */ + 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"); +} -- cgit v1.2.3