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

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Date:	Sun, 30 Mar 2014 12:09:53 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stefani Seibold <stefani@...bold.net>
CC:	Andy Lutomirski <luto@...capital.net>, 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

Well, I applied the patch.  This is not ABI yet and Andy is right it makes more sense.

On March 30, 2014 12:00:40 PM PDT, Stefani Seibold <stefani@...bold.net> wrote:
>I think it is in review. I still wait for the confirmation of my assign
>form.
>
>Am Sonntag, den 30.03.2014, 09:59 -0700 schrieb H. Peter Anvin:
>> Has your glibc patch been accepted upstream yet? I'm assuming not, in
>which case this is a legitimate patch.
>> 
>> On March 29, 2014 11:33:37 PM PDT, Stefani Seibold
><stefani@...bold.net> wrote:
>> >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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