text: static int CVE_2014_3534_PATCHED___poke_user(struct task_struct *child, addr_t addr, addr_t data)
  {
  	struct user *dummy = NULL;
  	addr_t offset;
  
  	if (addr < (addr_t) &dummy->regs.acrs) {
  		/*
  		 * psw and gprs are stored on the stack
  		 */
  		if (addr == (addr_t) &dummy->regs.psw.mask) {
  			unsigned long mask = PSW_MASK_USER;
  
  			mask |= is_ri_task(child) ? PSW_MASK_RI : 0;
  			if ((data ^ PSW_USER_BITS) & ~mask)
  				/* Invalid psw mask. */
  				return -EINVAL;
  			if ((data & PSW_MASK_ASC) == PSW_ASC_HOME)
  				/* Invalid address-space-control bits */
  				return -EINVAL;
  			if ((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))
  				/* Invalid addressing mode bits */
  				return -EINVAL;
  		}
  		*(addr_t *)((addr_t) &task_pt_regs(child)->psw + addr) = data;
  
  	} else if (addr < (addr_t) (&dummy->regs.orig_gpr2)) {
  		/*
  		 * access registers are stored in the thread structure
  		 */
  		offset = addr - (addr_t) &dummy->regs.acrs;
  #ifdef CONFIG_64BIT
  		/*
  		 * Very special case: old & broken 64 bit gdb writing
  		 * to acrs[15] with a 64 bit value. Ignore the lower
  		 * half of the value and write the upper 32 bit to
  		 * acrs[15]. Sick...
  		 */
  		if (addr == (addr_t) &dummy->regs.acrs[15])
  			child->thread.acrs[15] = (unsigned int) (data >> 32);
  		else
  #endif
  		*(addr_t *)((addr_t) &child->thread.acrs + offset) = data;
  
  	} else if (addr == (addr_t) &dummy->regs.orig_gpr2) {
  		/*
  		 * orig_gpr2 is stored on the kernel stack
  		 */
  		task_pt_regs(child)->orig_gpr2 = data;
  
  	} else if (addr < (addr_t) &dummy->regs.fp_regs) {
  		/*
  		 * prevent writes of padding hole between
  		 * orig_gpr2 and fp_regs on s390.
  		 */
  		return 0;
  
  	} else if (addr < (addr_t) (&dummy->regs.fp_regs + 1)) {
  		/*
  		 * floating point regs. are stored in the thread structure
  		 */
  		if (addr == (addr_t) &dummy->regs.fp_regs.fpc)
  			if ((unsigned int) data != 0 ||
  			    test_fp_ctl(data >> (BITS_PER_LONG - 32)))
  				return -EINVAL;
  		offset = addr - (addr_t) &dummy->regs.fp_regs;
  		*(addr_t *)((addr_t) &child->thread.fp_regs + offset) = data;
  
  	} else if (addr < (addr_t) (&dummy->regs.per_info + 1)) {
  		/*
  		 * Handle access to the per_info structure.
  		 */
  		addr -= (addr_t) &dummy->regs.per_info;
  		__poke_user_per(child, addr, data);
  
  	}
  
  	return 0;
  }
  