https://github.com/torvalds/linux
Pull s390 fix from Vasily Gorbik: "One fix for 5.15-rc4: Avoid CIO excessive path-verification requests, which might cause unwanted delays" * tag 's390-5.15-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/cio: avoid excessive path-verification requests
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Merge tag 's390-5.15-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
// 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 <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");
}
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