linux-kernel - Re: [REVIEW][PATCH 13/20] signal/x86: Remove the pkey parameter from do

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Date:   Tue, 18 Sep 2018 22:45:46 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
cc:     LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [REVIEW][PATCH 13/20] signal/x86: Remove the pkey parameter from
 do_sigbus



On Tue, 18 Sep 2018, Eric W. Biederman wrote:

> The function do_sigbus never sets si_code to PKUERR so it can never
> return a pkey to userspace.  Therefore remove the unusable pkey
> parameter from do_sigbus.
> 
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>

> ---
>  arch/x86/mm/fault.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
> index cfc88920716f..6886866c072d 100644
> --- a/arch/x86/mm/fault.c
> +++ b/arch/x86/mm/fault.c
> @@ -962,7 +962,7 @@ bad_area_access_error(struct pt_regs *regs, unsigned long error_code,
>  
>  static void
>  do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
> -	  u32 *pkey, unsigned int fault)
> +	  unsigned int fault)
>  {
>  	struct task_struct *tsk = current;
>  
> @@ -994,7 +994,7 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address,
>  		return;
>  	}
>  #endif
> -	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk, pkey);
> +	force_sig_info_fault(SIGBUS, BUS_ADRERR, address, tsk, NULL);
>  }
>  
>  static noinline void
> @@ -1023,7 +1023,7 @@ mm_fault_error(struct pt_regs *regs, unsigned long error_code,
>  	} else {
>  		if (fault & (VM_FAULT_SIGBUS|VM_FAULT_HWPOISON|
>  			     VM_FAULT_HWPOISON_LARGE))
> -			do_sigbus(regs, error_code, address, pkey, fault);
> +			do_sigbus(regs, error_code, address, fault);
>  		else if (fault & VM_FAULT_SIGSEGV)
>  			bad_area_nosemaphore(regs, error_code, address);
>  		else
> -- 
> 2.17.1
> 
>