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Revision 342300cc9cd3428bc6bfe5809bfcc1b9a0f06702 authored by Martin Schwidefsky on 19 February 2016, 13:44:14 UTC, committed by Martin Schwidefsky on 22 February 2016, 08:29:35 UTC 
s390/compat: correct restore of high gprs on signal return
 
git commit 8070361799ae1e3f4ef347bd10f0a508ac10acfb
"s390: add support for vector extension"
broke 31-bit compat processes in regard to signal handling.

The restore_sigregs_ext32() function is used to restore the additional
elements from the user space signal frame. Among the additional elements
are the upper registers halves for 64-bit register support for 31-bit
processes. The copy_from_user that is used to retrieve the high-gprs
array from the user stack uses an incorrect length, 8 bytes instead of
64 bytes. This causes incorrect upper register halves to get loaded.

Cc: stable@vger.kernel.org # 3.8+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1 parent 81f70ba
Raw File
treeboot-ebony.c 
/*
 * Old U-boot compatibility for Ebony
 *
 * Author: David Gibson <david@gibson.dropbear.id.au>
 *
 * Copyright 2007 David Gibson, IBM Corporatio.
 *   Based on cuboot-83xx.c, which is:
 * Copyright (c) 2007 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include "ops.h"
#include "stdio.h"
#include "44x.h"

BSS_STACK(4096);

#define OPENBIOS_MAC_BASE	0xfffffe0c
#define OPENBIOS_MAC_OFFSET	0xc

void platform_init(void)
{
	unsigned long end_of_ram = 0x8000000;
	unsigned long avail_ram = end_of_ram - (unsigned long)_end;

	simple_alloc_init(_end, avail_ram, 32, 64);
	ebony_init((u8 *)OPENBIOS_MAC_BASE,
		   (u8 *)(OPENBIOS_MAC_BASE + OPENBIOS_MAC_OFFSET));
}
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