mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
54 lines
1.3 KiB
54 lines
1.3 KiB
// 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 <[email protected]> |
|
*/ |
|
#define pr_fmt(fmt) "rodata_test: " fmt |
|
|
|
#include <linux/rodata_test.h> |
|
#include <linux/uaccess.h> |
|
#include <asm/sections.h> |
|
|
|
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"); |
|
}
|
|
|