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

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Message-ID: <70a0dc4b-14d4-4684-9da8-b162a0303c17@email.android.com>
Date:	Sun, 30 Mar 2014 09:59:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stefani Seibold <stefani@...bold.net>,
	Andy Lutomirski <luto@...capital.net>
CC:	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

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: *;
>>  	};
>>  }

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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