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Re: [PORTS] Bug Report with Postgres 7.4 on AIX 5.3

From: Vincent Vanwynsberghe <vvanwynsberghe(at)ccncsi(dot)net>
To: pgsql-ports(at)postgresql(dot)org, pgsql-bugs(at)postgresql(dot)org
Cc: "Mohan, Ross" <RMohan(at)arbinet(dot)com>
Subject: Re: [PORTS] Bug Report with Postgres 7.4 on AIX 5.3
Date: 2005-05-19 08:49:14
Message-ID: IKEPJJEJDCJPKMLEECEDAEKNCCAA.vvanwynsberghe@ccncsi.net (view raw or flat)
Thread:
Lists: pgsql-bugspgsql-ports
Hi,

We opened a call to IBM also, but until now we didn't receive anything (see
the attached mail).
In order to take into account the RFC 3943, we find a way to fixed the
problem by modifying the file socket.h :

#define       _SS_MAXSIZE     128   /* Implementation specific max size */

SHOULD BE REPLACED  BY

#define _SS_MAXSIZE     (sizeof(struct sockaddr_un))    /* Implementation
specific max size */

With this modification, Postgres 7.4 run on AIX5.3.
This is really an AIX problem.

An other's proposal done by Bull (our provider of the AIX system) is the
following :
Reduce the size of the field sun_path in the structure sockaddr_un (un.h)
and not increase the size of the structure sockaddr_storage.

char        sun_path[PATH_MAX]; /* changed from 104 to PATH_MAX to support
long user names */

SHOULD BE REPLACED  BY

char        sun_path[104]; /* changed from 104 to PATH_MAX to support long
user names */

With this modification, Postgres 7.4 run also on AIX5.3.

Both modification can have an impact on the AIX5.3 OS and IBM should be
confirm if a fixed is needed for that problem ?

Kind Regards,
Vincent Vanwynsberghe

> -----Original Message-----
> From: Mohan, Ross [mailto:RMohan(at)arbinet(dot)com]
> Sent: jeudi 19 mai 2005 2:23
> To: vvanwynsberghe(at)ccncsi(dot)net
> Subject: RE: [PORTS] Bug Report with Postgres 7.4 on AIX 5.3
>
>
> Vincent,
>
> 1) I am having the exact same problem:  I cannot even do a
> CREATEDB in 8.0.2 on AIX5.3
>
> 2) You sent your mail to the PG lists, but not to IBM, possibly?
>
> 3) If you think it will help, I can call support as well.
>
>
>
> If you get ANY word on this, whether a fix, a tweak, or a
> workaround, please Please PLEASE
> post to the list rapidly.
>
> We're dead in the water on this and the IT environment around
> here is such that if I can't
> get PG working on AIX, it'll be marked for death. And I really
> wanted to start
> using PG around here.
>
> Thanks!!!!!
>
>
> -- Ross Mohan
>
>
>
> -----Original Message-----
> From: pgsql-ports-owner(at)postgresql(dot)org
> [mailto:pgsql-ports-owner(at)postgresql(dot)org] On Behalf Of Vincent
> Vanwynsberghe
> Sent: Tuesday, May 10, 2005 4:08 AM
> To: pgsql-ports(at)postgresql(dot)org; pgsql-bugs(at)postgresql(dot)org
> Subject: [PORTS] Bug Report with Postgres 7.4 on AIX 5.3
>
>
> Dear Support,
>
> We try to install Postgres 7.4 on AIX 5.3 (IBM,9111-520).
> The compilation is good and we are able to start the postmaster.
> When we try to start the psql we got the following error :
> FATAL:  unsupported frontend protocol 0.0: server supports 1.0 to 3.0
>
> We run the psql under the AIX debugger dbx and our conclusions
> are the following :
>
> In the file fe-connect.c we try to copy a area of 1025 in the
> conn->raddr.addr area but the size of that area is only 144.
> The result is a corruption of the pg_conn structure
>
>  +1175                                          /* Remember
> current address
> for possible error msg */
>  +1176                                          memcpy(&conn->raddr.addr,
> addr_cur->ai_addr,
>  +1177
> addr_cur->ai_addrlen);
>
>
> The addr_cur->ai_addrlen is set with the sizeof(struct
> sockaddr_un) in the file ip.c.
>
> In the file libpq-int.h the structure pg_conn contains 2 fields SockAddr
>  * PGconn stores all the state data associated with a single connection
>  * to a backend.
>  */
> struct pg_conn
> {
> ...
>  SockAddr        laddr;                  /* Local address */
>  SockAddr        raddr;
> ...
> }
>
> The structure SockAddr is defined in the file pqcomm.h
>
> typedef struct
> {
>         struct sockaddr_storage addr;
>         ACCEPT_TYPE_ARG3 salen;
> } SockAddr;
>
>
> On Our AIX 5.3 the sockaddr_un is defined in the file
> /usr/include/sys/un.h
>
> #if defined(COMPAT_43) && !defined(_KERNEL)
> struct  sockaddr_un {
>         ushort_t        sun_family;     /* AF_UNIX */
>         char        sun_path[PATH_MAX]; /* changed from 104 to PATH_MAX to
> support long user names */
> };
> #else
> struct  sockaddr_un {
>         uchar_t     sun_len;            /* sockaddr len including null */
>         sa_family_t sun_family;         /* AF_UNIX */
>         char        sun_path[PATH_MAX]; /* changed from 104 to PATH_MAX to
> support long user names */
> };
> #endif /* COMPAT_43 && !_KERNEL */
>
> PATH_MAX is defined in the file /usr/include/sys/limits.h
>
> #if _POSIX_C_SOURCE >= 200112L && !(defined _ALL_SOURCE) ||
> defined(_PATHMAX_HAS_NULL)
> #define PATH_MAX        1024            /* max number of bytes in a
> pathname.
>                                            includes a terminating
> null */ #else
> #define PATH_MAX        1023
> #endif
>
> In our platform the sizeof of struct  sockaddr_un is 1025 and the
> sizeof of SockAddr is 144. In conclusion the instructions done in
> the function PQconnectPoll cause a memory overflow !!!
>
> +1175                                          /* Remember current address
> for possible error msg */
> +1176                                          memcpy(&conn->raddr.addr,
> addr_cur->ai_addr,
> +1177
> addr_cur->ai_addrlen);
>
> Are you aware about this problem ?
> Could you give us a way to solve the problem ?
>
> Kind Regards,
> Vincent Vanwynsberghe
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings

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