linux-kernel - Re: [PATCH] x86: Fix the symbol versions on the 32-bit vDSO

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Message-ID: <1396161217.32686.1.camel@vger.seibold.net>
Date:	Sun, 30 Mar 2014 08:33:37 +0200
From:	Stefani Seibold <stefani@...bold.net>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Fix the symbol versions on the 32-bit vDSO

Am Samstag, den 29.03.2014, 13:15 -0700 schrieb Andy Lutomirski:
> The new symbols provide the same API as the 64-bit variants, so they
> should have the same symbol version name.  This can't break
> userspace, since these symbols are new for 32-bit Linux.
> 

This breaks my glibc patch... What is the benefit for doing this in that
way?

> Signed-off-by: Andy Lutomirski <luto@...capital.net>
> ---
>  arch/x86/vdso/vdso32/vdso32.lds.S | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/vdso/vdso32/vdso32.lds.S b/arch/x86/vdso/vdso32/vdso32.lds.S
> index 28c4607..aadb8b9 100644
> --- a/arch/x86/vdso/vdso32/vdso32.lds.S
> +++ b/arch/x86/vdso/vdso32/vdso32.lds.S
> @@ -23,14 +23,18 @@ ENTRY(__kernel_vsyscall);
>   */
>  VERSION
>  {
> +	LINUX_2.6 {
> +	global:
> +		__vdso_clock_gettime;
> +		__vdso_gettimeofday;
> +		__vdso_time;
> +	};
> +
>  	LINUX_2.5 {
>  	global:
>  		__kernel_vsyscall;
>  		__kernel_sigreturn;
>  		__kernel_rt_sigreturn;
> -		__vdso_clock_gettime;
> -		__vdso_gettimeofday;
> -		__vdso_time;
>  	local: *;
>  	};
>  }


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