linux-kernel - Re: [PATCHv5 2/4] x86: Add build salt to the vDSO

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Date:   Thu, 5 Jul 2018 14:46:35 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Mark Wielaard <mjw@...oraproject.org>,
        "H . J . Lu" <hjl.tools@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Nick Clifton <nickc@...hat.com>,
        Cary Coutant <ccoutant@...il.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCHv5 2/4] x86: Add build salt to the vDSO

Sure.

On Thu, Jul 5, 2018 at 12:08 PM, Laura Abbott <labbott@...hat.com> wrote:
> On 07/05/2018 08:58 AM, Andy Lutomirski wrote:
>>
>> On Tue, Jul 3, 2018 at 4:34 PM, Laura Abbott <labbott@...hat.com> wrote:
>>>
>>>
>>> The vDSO needs to have a unique build id in a similar manner
>>> to the kernel and modules. Use the build salt macro.
>>>
>>
>> Looks good to me.  I have no idea whose tree these would go through.
>>
>
> I was intending this to go through kbuild tree. Can I take this
> as an Ack?
>
>
>>> Signed-off-by: Laura Abbott <labbott@...hat.com>
>>> ---
>>> v5: Switched to using the single line BUILD_SALT macro
>>> ---
>>>   arch/x86/entry/vdso/vdso-note.S   | 3 +++
>>>   arch/x86/entry/vdso/vdso32/note.S | 3 +++
>>>   2 files changed, 6 insertions(+)
>>>
>>> diff --git a/arch/x86/entry/vdso/vdso-note.S
>>> b/arch/x86/entry/vdso/vdso-note.S
>>> index 79a071e4357e..79423170118f 100644
>>> --- a/arch/x86/entry/vdso/vdso-note.S
>>> +++ b/arch/x86/entry/vdso/vdso-note.S
>>> @@ -3,6 +3,7 @@
>>>    * Here we can supply some information useful to userland.
>>>    */
>>>
>>> +#include <linux/build-salt.h>
>>>   #include <linux/uts.h>
>>>   #include <linux/version.h>
>>>   #include <linux/elfnote.h>
>>> @@ -10,3 +11,5 @@
>>>   ELFNOTE_START(Linux, 0, "a")
>>>          .long LINUX_VERSION_CODE
>>>   ELFNOTE_END
>>> +
>>> +BUILD_SALT
>>> diff --git a/arch/x86/entry/vdso/vdso32/note.S
>>> b/arch/x86/entry/vdso/vdso32/note.S
>>> index 9fd51f206314..e78047d119f6 100644
>>> --- a/arch/x86/entry/vdso/vdso32/note.S
>>> +++ b/arch/x86/entry/vdso/vdso32/note.S
>>> @@ -4,6 +4,7 @@
>>>    * Here we can supply some information useful to userland.
>>>    */
>>>
>>> +#include <linux/build-salt.h>
>>>   #include <linux/version.h>
>>>   #include <linux/elfnote.h>
>>>
>>> @@ -14,6 +15,8 @@ ELFNOTE_START(Linux, 0, "a")
>>>          .long LINUX_VERSION_CODE
>>>   ELFNOTE_END
>>>
>>> +BUILD_SALT
>>> +
>>>   #ifdef CONFIG_XEN
>>>   /*
>>>    * Add a special note telling glibc's dynamic linker a fake hardware
>>> --
>>> 2.17.1
>>>
>