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Revision ab6b1d1fc4aae6b8bd6fb1422405568094c9b40f authored by Thiago Jung Bauermann on 20 December 2016, 00:22:45 UTC, committed by Linus Torvalds on 20 December 2016, 17:48:44 UTC 
powerpc: ima: send the kexec buffer to the next kernel
 
The IMA kexec buffer allows the currently running kernel to pass the
measurement list via a kexec segment to the kernel that will be kexec'd.

This is the architecture-specific part of setting up the IMA kexec
buffer for the next kernel.  It will be used in the next patch.

Link: http://lkml.kernel.org/r/1480554346-29071-6-git-send-email-zohar@linux.vnet.ibm.com
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andreas Steffen <andreas.steffen@strongswan.org>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Josh Sklar <sklar@linux.vnet.ibm.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent d158847
Raw File
sys_nios2.c 
/*
 * Copyright (C) 2013 Altera Corporation
 * Copyright (C) 2011-2012 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2004 Microtronix Datacom Ltd.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#include <linux/export.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/syscalls.h>

#include <asm/cacheflush.h>
#include <asm/traps.h>

/* sys_cacheflush -- flush the processor cache. */
asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len,
				unsigned int op)
{
	struct vm_area_struct *vma;

	if (len == 0)
		return 0;

	/* We only support op 0 now, return error if op is non-zero.*/
	if (op)
		return -EINVAL;

	/* Check for overflow */
	if (addr + len < addr)
		return -EFAULT;

	/*
	 * Verify that the specified address region actually belongs
	 * to this process.
	 */
	vma = find_vma(current->mm, addr);
	if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
		return -EFAULT;

	flush_cache_range(vma, addr, addr + len);

	return 0;
}

asmlinkage int sys_getpagesize(void)
{
	return PAGE_SIZE;
}
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