linux-kernel - Re: [PATCH] x86 ptrace: fix PTRACE

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Message-Id: <20080703.105858.193690507.takada@mbf.nifty.com>
Date:	Thu, 03 Jul 2008 10:58:58 +0900 (JST)
From:	TAKADA Yoshihito <takada@....nifty.com>
To:	roland@...hat.com
Cc:	mingo@...e.hu, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: Re: [PATCH] x86 ptrace: fix PTRACE_GETFPXREGS error

Hi. Thanks for your right patch.
BTW, are FXSAVE and FXRSTOR instructions device?
Is it right to return ENODEV?
I think I had bettor return EXIO or ENOTSUP. 
If it discussed, tell me URL of tree at lkml.org.

From: Roland McGrath <roland@...hat.com>
Subject: [PATCH] x86 ptrace: fix PTRACE_GETFPXREGS error
Date: Mon, 30 Jun 2008 14:02:41 -0700 (PDT)

> ptrace has always returned only -EIO for all failures to access
> registers.  The user_regset calls are allowed to return a more
> meaningful variety of errors.  The REGSET_XFP calls use -ENODEV
> for !cpu_has_fxsr hardware.  Make ptrace return the traditional
> -EIO instead of the error code from the user_regset call.
> 
> Signed-off-by: Roland McGrath <roland@...hat.com>
> ---
>  arch/x86/kernel/ptrace.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
> index a7835f2..77040b6 100644
> --- a/arch/x86/kernel/ptrace.c
> +++ b/arch/x86/kernel/ptrace.c
> @@ -943,13 +943,13 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
>  		return copy_regset_to_user(child, &user_x86_32_view,
>  					   REGSET_XFP,
>  					   0, sizeof(struct user_fxsr_struct),
> -					   datap);
> +					   datap) ? -EIO : 0;
>  
>  	case PTRACE_SETFPXREGS:	/* Set the child extended FPU state. */
>  		return copy_regset_from_user(child, &user_x86_32_view,
>  					     REGSET_XFP,
>  					     0, sizeof(struct user_fxsr_struct),
> -					     datap);
> +					     datap) ? -EIO : 0;
>  #endif
>  
>  #if defined CONFIG_X86_32 || defined CONFIG_IA32_EMULATION
> --
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