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Revision af8f3f514d193eb353f9b6cea503c55d074e6153 authored by Hanjun Guo on 04 January 2015, 10:55:02 UTC, committed by Rafael J. Wysocki on 05 January 2015, 22:32:42 UTC 
ACPI / processor: Convert apic_id to phys_id to make it arch agnostic
 
apic_id in MADT table is the CPU hardware id which identify
it self in the system for x86 and ia64, OSPM will use it for
SMP init to map APIC ID to logical cpu number in the early
boot, when the DSDT/SSDT (ACPI namespace) is scanned later, the
ACPI processor driver is probed and the driver will use acpi_id
in DSDT to get the apic_id, then map to the logical cpu number
which is needed by the processor driver.

Before ACPI 5.0, only x86 and ia64 were supported in ACPI spec,
so apic_id is used both in arch code and ACPI core which is
pretty fine. Since ACPI 5.0, ARM is supported by ACPI and
APIC is not available on ARM, this will confuse people when
apic_id is both used by x86 and ARM in one function.

So convert apic_id to phys_id (which is the original meaning)
in ACPI processor dirver to make it arch agnostic, but leave the
arch dependent code unchanged, no functional change.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent b7392d2
Raw File
test_user_copy.c 
/*
 * Kernel module for testing copy_to/from_user infrastructure.
 *
 * Copyright 2013 Google Inc. All Rights Reserved
 *
 * Authors:
 *      Kees Cook       <keescook@chromium.org>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/mman.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>

#define test(condition, msg)		\
({					\
	int cond = (condition);		\
	if (cond)			\
		pr_warn("%s\n", msg);	\
	cond;				\
})

static int __init test_user_copy_init(void)
{
	int ret = 0;
	char *kmem;
	char __user *usermem;
	char *bad_usermem;
	unsigned long user_addr;
	unsigned long value = 0x5A;

	kmem = kmalloc(PAGE_SIZE * 2, GFP_KERNEL);
	if (!kmem)
		return -ENOMEM;

	user_addr = vm_mmap(NULL, 0, PAGE_SIZE * 2,
			    PROT_READ | PROT_WRITE | PROT_EXEC,
			    MAP_ANONYMOUS | MAP_PRIVATE, 0);
	if (user_addr >= (unsigned long)(TASK_SIZE)) {
		pr_warn("Failed to allocate user memory\n");
		kfree(kmem);
		return -ENOMEM;
	}

	usermem = (char __user *)user_addr;
	bad_usermem = (char *)user_addr;

	/* Legitimate usage: none of these should fail. */
	ret |= test(copy_from_user(kmem, usermem, PAGE_SIZE),
		    "legitimate copy_from_user failed");
	ret |= test(copy_to_user(usermem, kmem, PAGE_SIZE),
		    "legitimate copy_to_user failed");
	ret |= test(get_user(value, (unsigned long __user *)usermem),
		    "legitimate get_user failed");
	ret |= test(put_user(value, (unsigned long __user *)usermem),
		    "legitimate put_user failed");

	/* Invalid usage: none of these should succeed. */
	ret |= test(!copy_from_user(kmem, (char __user *)(kmem + PAGE_SIZE),
				    PAGE_SIZE),
		    "illegal all-kernel copy_from_user passed");
	ret |= test(!copy_from_user(bad_usermem, (char __user *)kmem,
				    PAGE_SIZE),
		    "illegal reversed copy_from_user passed");
	ret |= test(!copy_to_user((char __user *)kmem, kmem + PAGE_SIZE,
				  PAGE_SIZE),
		    "illegal all-kernel copy_to_user passed");
	ret |= test(!copy_to_user((char __user *)kmem, bad_usermem,
				  PAGE_SIZE),
		    "illegal reversed copy_to_user passed");
	ret |= test(!get_user(value, (unsigned long __user *)kmem),
		    "illegal get_user passed");
	ret |= test(!put_user(value, (unsigned long __user *)kmem),
		    "illegal put_user passed");

	vm_munmap(user_addr, PAGE_SIZE * 2);
	kfree(kmem);

	if (ret == 0) {
		pr_info("tests passed.\n");
		return 0;
	}

	return -EINVAL;
}

module_init(test_user_copy_init);

static void __exit test_user_copy_exit(void)
{
	pr_info("unloaded.\n");
}

module_exit(test_user_copy_exit);

MODULE_AUTHOR("Kees Cook <keescook@chromium.org>");
MODULE_LICENSE("GPL");
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