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>E.200. Release 7.4.27</A
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><P
><B
>Release date: </B
>2009-12-14</P
></DIV
><P
> This release contains a variety of fixes from 7.4.26.
For information about new features in the 7.4 major release, see
<A
HREF="release-7-4.html"
>Section E.227</A
>.
</P
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>E.200.1. Migration to Version 7.4.27</A
></H2
><P
> A dump/restore is not required for those running 7.4.X.
However, if you are upgrading from a version earlier than 7.4.26,
see <A
HREF="release-7-4-26.html"
>Section E.201</A
>.
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>E.200.2. Changes</A
></H2
><P
></P
><UL
><LI
><P
> Protect against indirect security threats caused by index functions
changing session-local state (Gurjeet Singh, Tom)
</P
><P
> This change prevents allegedly-immutable index functions from possibly
subverting a superuser's session (CVE-2009-4136).
</P
></LI
><LI
><P
> Reject SSL certificates containing an embedded null byte in the common
name (CN) field (Magnus)
</P
><P
> This prevents unintended matching of a certificate to a server or client
name during SSL validation (CVE-2009-4034).
</P
></LI
><LI
><P
> Fix possible crash during backend-startup-time cache initialization (Tom)
</P
></LI
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><P
> Prevent signals from interrupting <TT
CLASS="LITERAL"
>VACUUM</TT
> at unsafe times
(Alvaro)
</P
><P
> This fix prevents a PANIC if a <TT
CLASS="LITERAL"
>VACUUM FULL</TT
> is canceled
after it's already committed its tuple movements, as well as transient
errors if a plain <TT
CLASS="LITERAL"
>VACUUM</TT
> is interrupted after having
truncated the table.
</P
></LI
><LI
><P
> Fix possible crash due to integer overflow in hash table size
calculation (Tom)
</P
><P
> This could occur with extremely large planner estimates for the size of
a hashjoin's result.
</P
></LI
><LI
><P
> Fix very rare crash in <TT
CLASS="TYPE"
>inet</TT
>/<TT
CLASS="TYPE"
>cidr</TT
> comparisons (Chris
Mikkelson)
</P
></LI
><LI
><P
> Fix PAM password processing to be more robust (Tom)
</P
><P
> The previous code is known to fail with the combination of the Linux
<TT
CLASS="LITERAL"
>pam_krb5</TT
> PAM module with Microsoft Active Directory as the
domain controller. It might have problems elsewhere too, since it was
making unjustified assumptions about what arguments the PAM stack would
pass to it.
</P
></LI
><LI
><P
> Make the postmaster ignore any <TT
CLASS="LITERAL"
>application_name</TT
> parameter in
connection request packets, to improve compatibility with future libpq
versions (Tom)
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