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

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Message-ID: <CALCETrVgcTy+MF_tSbPTPKyUYO45A6hrz=JLLarRouXGKrZuyw@mail.gmail.com>
Date:	Sat, 29 Mar 2014 23:49:34 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Stefani Seibold <stefani@...bold.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

On Sat, Mar 29, 2014 at 11:33 PM, 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?

The functions do the same thing as they do in the 64-bit and x32
cases, so the versions should be the same.

>
>> 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: *;
>>       };
>>  }
>
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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