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
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
misc_32.c
/*
* misc.c: Miscellaneous prom functions that don't belong
* anywhere else.
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
extern void restore_current(void);
DEFINE_SPINLOCK(prom_lock);
/* Reset and reboot the machine with the command 'bcommand'. */
void
prom_reboot(char *bcommand)
{
unsigned long flags;
spin_lock_irqsave(&prom_lock, flags);
(*(romvec->pv_reboot))(bcommand);
/* Never get here. */
restore_current();
spin_unlock_irqrestore(&prom_lock, flags);
}
/* Forth evaluate the expression contained in 'fstring'. */
void
prom_feval(char *fstring)
{
unsigned long flags;
if(!fstring || fstring[0] == 0)
return;
spin_lock_irqsave(&prom_lock, flags);
if(prom_vers == PROM_V0)
(*(romvec->pv_fortheval.v0_eval))(strlen(fstring), fstring);
else
(*(romvec->pv_fortheval.v2_eval))(fstring);
restore_current();
spin_unlock_irqrestore(&prom_lock, flags);
}
EXPORT_SYMBOL(prom_feval);
/* Drop into the prom, with the chance to continue with the 'go'
* prom command.
*/
void
prom_cmdline(void)
{
unsigned long flags;
spin_lock_irqsave(&prom_lock, flags);
(*(romvec->pv_abort))();
restore_current();
spin_unlock_irqrestore(&prom_lock, flags);
set_auxio(AUXIO_LED, 0);
}
/* Drop into the prom, but completely terminate the program.
* No chance of continuing.
*/
void __noreturn
prom_halt(void)
{
unsigned long flags;
again:
spin_lock_irqsave(&prom_lock, flags);
(*(romvec->pv_halt))();
/* Never get here. */
restore_current();
spin_unlock_irqrestore(&prom_lock, flags);
goto again; /* PROM is out to get me -DaveM */
}
typedef void (*sfunc_t)(void);
/* Set prom sync handler to call function 'funcp'. */
void
prom_setsync(sfunc_t funcp)
{
if(!funcp) return;
*romvec->pv_synchook = funcp;
}
/* Get the idprom and stuff it into buffer 'idbuf'. Returns the
* format type. 'num_bytes' is the number of bytes that your idbuf
* has space for. Returns 0xff on error.
*/
unsigned char
prom_get_idprom(char *idbuf, int num_bytes)
{
int len;
len = prom_getproplen(prom_root_node, "idprom");
if((len>num_bytes) || (len==-1)) return 0xff;
if(!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
return idbuf[0];
return 0xff;
}
/* Get the major prom version number. */
int
prom_version(void)
{
return romvec->pv_romvers;
}
/* Get the prom plugin-revision. */
int
prom_getrev(void)
{
return prom_rev;
}
/* Get the prom firmware print revision. */
int
prom_getprev(void)
{
return prom_prev;
}
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