[PATCH] powerpc: Send SIGBUS from machine_check

[Joakim Tjernlund]

ping

Also Cc: stable at vger.kernel.org

On Thu, 2020-10-01 at 19:05 +0200, Joakim Tjernlund wrote:
> Embedded PPC CPU should send SIGBUS to user space when applicable.
> 
> Signed-off-by: Joakim Tjernlund <joakim.tjernlund at infinera.com>
> ---
>  arch/powerpc/kernel/traps.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index 0381242920d9..12715d24141c 100644
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -621,6 +621,11 @@ int machine_check_e500mc(struct pt_regs *regs)
>  		       reason & MCSR_MEA ? "Effective" : "Physical", addr);
>  	}
>  
> 
> +	if ((user_mode(regs))) {
> +		_exception(SIGBUS, regs, reason, regs->nip);
> +		recoverable = 1;
> +	}
> +
>  silent_out:
>  	mtspr(SPRN_MCSR, mcsr);
>  	return mfspr(SPRN_MCSR) == 0 && recoverable;
> @@ -665,6 +670,10 @@ int machine_check_e500(struct pt_regs *regs)
>  	if (reason & MCSR_BUS_RPERR)
>  		printk("Bus - Read Parity Error\n");
>  
> 
> +	if ((user_mode(regs))) {
> +		_exception(SIGBUS, regs, reason, regs->nip);
> +		return 1;
> +	}
>  	return 0;
>  }
>  
> 
> @@ -695,6 +704,10 @@ int machine_check_e200(struct pt_regs *regs)
>  	if (reason & MCSR_BUS_WRERR)
>  		printk("Bus - Write Bus Error on buffered store or cache line push\n");
>  
> 
> +	if ((user_mode(regs))) {
> +		_exception(SIGBUS, regs, reason, regs->nip);
> +		return 1;
> +	}
>  	return 0;
>  }
>  #elif defined(CONFIG_PPC32)
> @@ -731,6 +744,10 @@ int machine_check_generic(struct pt_regs *regs)
>  	default:
>  		printk("Unknown values in msr\n");
>  	}
> +	if ((user_mode(regs))) {
> +		_exception(SIGBUS, regs, reason, regs->nip);
> +		return 1;
> +	}
>  	return 0;
>  }
>  #endif /* everything else */