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2959a5f726
This patch makes arch-independent testcases for RODATA. Both x86 and x86_64 already have testcases for RODATA, But they are arch-specific because using inline assembly directly. And cacheflush.h is not a suitable location for rodata-test related things. Since they were in cacheflush.h, If someone change the state of CONFIG_DEBUG_RODATA_TEST, It cause overhead of kernel build. To solve the above issues, write arch-independent testcases and move it to shared location. [jinb.park7@gmail.com: fix config dependency] Link: http://lkml.kernel.org/r/20170209131625.GA16954@pjb1027-Latitude-E5410 Link: http://lkml.kernel.org/r/20170129105436.GA9303@pjb1027-Latitude-E5410 Signed-off-by: Jinbum Park <jinb.park7@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/*
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* rodata_test.c: functional test for mark_rodata_ro function
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*
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* (C) Copyright 2008 Intel Corporation
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* Author: Arjan van de Ven <arjan@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include <linux/uaccess.h>
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#include <asm/sections.h>
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const int rodata_test_data = 0xC3;
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EXPORT_SYMBOL_GPL(rodata_test_data);
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void rodata_test(void)
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{
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unsigned long start, end;
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int zero = 0;
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/* test 1: read the value */
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/* If this test fails, some previous testrun has clobbered the state */
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if (!rodata_test_data) {
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pr_err("rodata_test: test 1 fails (start data)\n");
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return;
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}
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/* test 2: write to the variable; this should fault */
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if (!probe_kernel_write((void *)&rodata_test_data,
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(void *)&zero, sizeof(zero))) {
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pr_err("rodata_test: test data was not read only\n");
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return;
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}
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/* test 3: check the value hasn't changed */
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if (rodata_test_data == zero) {
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pr_err("rodata_test: test data was changed\n");
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return;
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}
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/* test 4: check if the rodata section is PAGE_SIZE aligned */
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start = (unsigned long)__start_rodata;
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end = (unsigned long)__end_rodata;
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if (start & (PAGE_SIZE - 1)) {
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pr_err("rodata_test: start of .rodata is not page size aligned\n");
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return;
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}
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if (end & (PAGE_SIZE - 1)) {
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pr_err("rodata_test: end of .rodata is not page size aligned\n");
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return;
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}
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pr_info("rodata_test: all tests were successful\n");
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}
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