diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/x86/kernel/test_rodata.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/x86/kernel/test_rodata.c')
-rw-r--r-- | kernel/arch/x86/kernel/test_rodata.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/kernel/arch/x86/kernel/test_rodata.c b/kernel/arch/x86/kernel/test_rodata.c new file mode 100644 index 000000000..5ecbfe509 --- /dev/null +++ b/kernel/arch/x86/kernel/test_rodata.c @@ -0,0 +1,80 @@ +/* + * test_rodata.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. + */ +#include <linux/module.h> +#include <asm/cacheflush.h> +#include <asm/sections.h> +#include <asm/asm.h> + +int rodata_test(void) +{ + unsigned long result; + unsigned long start, end; + + /* test 1: read the value */ + /* If this test fails, some previous testrun has clobbered the state */ + if (!rodata_test_data) { + printk(KERN_ERR "rodata_test: test 1 fails (start data)\n"); + return -ENODEV; + } + + /* test 2: write to the variable; this should fault */ + /* + * If this test fails, we managed to overwrite the data + * + * This is written in assembly to be able to catch the + * exception that is supposed to happen in the correct + * case + */ + + result = 1; + asm volatile( + "0: mov %[zero],(%[rodata_test])\n" + " mov %[zero], %[rslt]\n" + "1:\n" + ".section .fixup,\"ax\"\n" + "2: jmp 1b\n" + ".previous\n" + _ASM_EXTABLE(0b,2b) + : [rslt] "=r" (result) + : [rodata_test] "r" (&rodata_test_data), [zero] "r" (0UL) + ); + + + if (!result) { + printk(KERN_ERR "rodata_test: test data was not read only\n"); + return -ENODEV; + } + + /* test 3: check the value hasn't changed */ + /* If this test fails, we managed to overwrite the data */ + if (!rodata_test_data) { + printk(KERN_ERR "rodata_test: Test 3 fails (end data)\n"); + return -ENODEV; + } + /* test 4: check if the rodata section is 4Kb aligned */ + start = (unsigned long)__start_rodata; + end = (unsigned long)__end_rodata; + if (start & (PAGE_SIZE - 1)) { + printk(KERN_ERR "rodata_test: .rodata is not 4k aligned\n"); + return -ENODEV; + } + if (end & (PAGE_SIZE - 1)) { + printk(KERN_ERR "rodata_test: .rodata end is not 4k aligned\n"); + return -ENODEV; + } + + return 0; +} + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Testcase for the DEBUG_RODATA infrastructure"); +MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>"); |