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Date: Tue, 26 Jun 2018 22:20:53 +0200
From: Matthias Schiffer <mschiffer@...verse-factory.net>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] sys/socket.h: fix SO_PEERSEC value on MIPS

On 06/26/2018 10:05 PM, Rich Felker wrote:
> On Tue, Jun 26, 2018 at 08:21:38PM +0200, Matthias Schiffer wrote:
>> On 06/25/2018 07:52 PM, Matthias Schiffer wrote:
>>> On 06/24/2018 05:30 PM, Rich Felker wrote:
>>>> On Sun, Jun 24, 2018 at 05:18:39PM +0200, Matthias Schiffer wrote:
>>>>> Differing from all other archs supported by musl, MIPS defines SO_PEERSEC
>>>>> to 30 instead of 31.
>>>>>
>>>>> Reported-by: Andrey Jr. Mlenikov <temnota.am@...il.com>
>>>>> ---
>>>>>  arch/mips/bits/socket.h    | 2 ++
>>>>>  arch/mips64/bits/socket.h  | 2 ++
>>>>>  arch/mipsn32/bits/socket.h | 2 ++
>>>>>  include/sys/socket.h       | 3 +++
>>>>>  4 files changed, 9 insertions(+)
>>>>>
>>>>> diff --git a/arch/mips/bits/socket.h b/arch/mips/bits/socket.h
>>>>> index 191ebdb5a418..39c42b822ac3 100644
>>>>> --- a/arch/mips/bits/socket.h
>>>>> +++ b/arch/mips/bits/socket.h
>>>>> @@ -48,5 +48,7 @@ struct cmsghdr {
>>>>>  #define SO_SNDBUFFORCE  31
>>>>>  #define SO_RCVBUFFORCE  33
>>>>>  
>>>>> +#define SO_PEERSEC      30
>>>>> +
>>>>>  #define SOCK_NONBLOCK     0200
>>>>>  #define SOCK_CLOEXEC  02000000
>>>>> diff --git a/arch/mips64/bits/socket.h b/arch/mips64/bits/socket.h
>>>>> index cf801797beb0..39b764df4c62 100644
>>>>> --- a/arch/mips64/bits/socket.h
>>>>> +++ b/arch/mips64/bits/socket.h
>>>>> @@ -64,5 +64,7 @@ struct cmsghdr {
>>>>>  #define SO_SNDBUFFORCE  31
>>>>>  #define SO_RCVBUFFORCE  33
>>>>>  
>>>>> +#define SO_PEERSEC      30
>>>>> +
>>>>>  #define SOCK_NONBLOCK     0200
>>>>>  #define SOCK_CLOEXEC  02000000
>>>>> diff --git a/arch/mipsn32/bits/socket.h b/arch/mipsn32/bits/socket.h
>>>>> index 191ebdb5a418..39c42b822ac3 100644
>>>>> --- a/arch/mipsn32/bits/socket.h
>>>>> +++ b/arch/mipsn32/bits/socket.h
>>>>> @@ -48,5 +48,7 @@ struct cmsghdr {
>>>>>  #define SO_SNDBUFFORCE  31
>>>>>  #define SO_RCVBUFFORCE  33
>>>>>  
>>>>> +#define SO_PEERSEC      30
>>>>> +
>>>>>  #define SOCK_NONBLOCK     0200
>>>>>  #define SOCK_CLOEXEC  02000000
>>>>> diff --git a/include/sys/socket.h b/include/sys/socket.h
>>>>> index 507da5cc2a40..6b6cf2fc3988 100644
>>>>> --- a/include/sys/socket.h
>>>>> +++ b/include/sys/socket.h
>>>>> @@ -203,7 +203,10 @@ struct linger {
>>>>>  #define SO_TIMESTAMP            29
>>>>>  #define SCM_TIMESTAMP           SO_TIMESTAMP
>>>>>  
>>>>> +#ifndef SO_PEERSEC
>>>>>  #define SO_PEERSEC              31
>>>>> +#endif
>>>>> +
>>>>>  #define SO_PASSSEC              34
>>>>>  #define SO_TIMESTAMPNS          35
>>>>>  #define SCM_TIMESTAMPNS         SO_TIMESTAMPNS
>>>>> -- 
>>>>> 2.18.0
>>>>
>>>> Should we perhaps do this under the SO_DEBUG conditional like all the
>>>> other SO_* that vary by arch? Doing so would require adding
>>>> definitions to the other weird archs (ibm ones) but might be cleaner
>>>> in the top-level header -- I'm not sure.
>>>>
>>>> Rich
>>>>
>>>
>>>
>>> That would actually make sense. I did not research what SO_PEERSEC even is
>>> before I sent the patch; only know I noticed that both the constants
>>> defined under SO_DEBUG and the others below the #endif are SOL_SOCKET, so
>>> it would be more consistent to move it under SO_DEBUG as well.
>>
>> Should I send an updated patch, or are you going to fix it up yourself?
> 
> I'm doing it now. Thanks. I think we're going to find that there are
> more SO_* that might vary by arch, especially if we ever add sparc.
> 
> What I'd kind of like to eventually do is get rid of the definitions
> in sys/socket.h itself and always have them all in bits, with most
> archs sharing the arch/generic version of the bits header. However
> that doesn't work with the current bits/socket.h since the generic
> definitions of msghdr and cmsghdr don't work on 64-bit. Perhaps we
> should introduce a new bits/sockopt.h (but this imposes an extra file
> open/parse for every #include <sys/socket.h>) or find some way to
> avoid the gratuitous difference (maybe alltypes.h could somehow
> provide padding definitions for a generic definition of [c]msghdr to
> use).
> 
> Anyway I won't delay the immediate bugfix with what-ifs about future
> direction.
> 
> Rich
> 

Thanks. It seems you missed to add SO_PEERSEC to powerpc{,64} and s390x
though, which also define SO_DEBUG.

Matthias



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