056b9d8a76
Since commit 3ad38ceb27 ("x86/mm: Remove CONFIG_DEBUG_NX_TEST"),
nothing is using the exported rodata_test_data variable, so drop the
export.
This additionally updates the pr_fmt to avoid redundant strings and
adjusts some whitespace.
Link: http://lkml.kernel.org/r/20170307005313.GA85809@beast
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Jinbum Park <jinb.park7@gmail.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
|
|
* rodata_test.c: functional test for mark_rodata_ro function
|
|
*
|
|
* (C) Copyright 2008 Intel Corporation
|
|
* Author: Arjan van de Ven <arjan@linux.intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2
|
|
* of the License.
|
|
*/
|
|
#define pr_fmt(fmt) "rodata_test: " fmt
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <asm/sections.h>
|
|
|
|
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 (!probe_kernel_write((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");
|
|
}
|