~/.pgpass is a sound choice everywhere, and "peer" authentication is
safe on every platform it supports. Cease to recommend "trust"
authentication, the safety of which is deeply configuration-specific.
Back-patch to 9.0, where pg_upgrade was introduced.
If pg_regcomp failed after having invoked markst/cleanst, it would leak any
"struct subre" nodes it had created. (We've already detected all regex
syntax errors at that point, so the only likely causes of later failure
would be query cancel or out-of-memory.) To fix, make sure freesrnode
knows the difference between the pre-cleanst and post-cleanst cleanup
procedures. Add some documentation of this less-than-obvious point.
Also, newlacon did the wrong thing with an out-of-memory failure from
realloc(), so that the previously allocated array would be leaked.
Both of these are pretty low-probability scenarios, but a bug is a bug,
so patch all the way back.
Per bug #10976 from Arthur O'Dwyer.
The consistent function contained several bugs:
* The "if (which2) { ... }" block was broken. It compared the argument's
lower bound against centroid's upper bound, while it was supposed to compare
the argument's upper bound against the centroid's lower bound (the comment
was correct, code was wrong). Also, it cleared bits in the "which1"
variable, while it was supposed to clear bits in "which2".
* If the argument's upper bound was equal to the centroid's lower bound, we
descended to both halves (= all quadrants). That's unnecessary, searching
the right quadrants is sufficient. This didn't lead to incorrect query
results, but was clearly wrong, and slowed down queries unnecessarily.
* In the case that argument's lower bound is adjacent to the centroid's
upper bound, we also don't need to visit all quadrants. Per similar
reasoning as previous point.
* The code where we compare the previous centroid with the current centroid
should match the code where we compare the current centroid with the
argument. The point of that code is to redo the calculation done in the
previous level, to see if we were supposed to traverse left or right (or up
or down), and if we actually did. If we moved in the different direction,
then we know there are no matches for bound.
Refactor the code and adds comments to make it more readable and easier to
reason about.
Backpatch to 9.3 where SP-GiST support for range types was introduced.
Trying to reassign objects owned by a user that had text search
dictionaries or configurations used to fail with:
ERROR: unexpected classid 3600
or
ERROR: unexpected classid 3602
Fix by adding cases for those object types in a switch in pg_shdepend.c.
Both REASSIGN OWNED and text search objects go back all the way to 8.1,
so backpatch to all supported branches. In 9.3 the alter-owner code was
made generic, so the required change in recent branches is pretty
simple; however, for 9.2 and older ones we need some additional
reshuffling to enable specifying objects by OID rather than name.
Text search templates and parsers are not owned objects, so there's no
change required for them.
Per bug #9749 reported by Michal Novotný
ExecEvalWholeRowVar incorrectly supposed that it could "bless" the source
TupleTableSlot just once per query. But if the input is coming from an
Append (or, perhaps, other cases?) more than one slot might be returned
over the query run. This led to "record type has not been registered"
errors when a composite datum was extracted from a non-blessed slot.
This bug has been there a long time; I guess it escaped notice because when
dealing with subqueries the planner tends to expand whole-row Vars into
RowExprs, which don't have the same problem. It is possible to trigger
the problem in all active branches, though, as illustrated by the added
regression test.
While the x output of "select x from t group by x" can be presumed unique,
this does not hold for "select x, generate_series(1,10) from t group by x",
because we may expand the set-returning function after the grouping step.
(Perhaps that should be re-thought; but considering all the other oddities
involved with SRFs in targetlists, it seems unlikely we'll change it.)
Put a check in query_is_distinct_for() so it's not fooled by such cases.
Back-patch to all supported branches.
David Rowley
Previously, when calculations on the need for toast tables changed,
pg_upgrade could not handle cases where the new cluster needed a TOAST
table and the old cluster did not. (It already handled the opposite
case.) This fixes the "OID mismatch" error typically generated in this
case.
Backpatch through 9.2
This function wasn't originally thought to be really user-facing,
because converting a table to a view isn't something we expect people
to do manually. So not all that much effort was spent on the error
messages; in particular, while the code will complain that you got
the column types wrong it won't say exactly what they are. But since
we repurposed the code to also check compatibility of rule RETURNING
lists, it's definitely user-facing. It now seems worthwhile to add
errdetail messages showing exactly what the conflict is when there's
a mismatch of column names or types. This is prompted by bug #10836
from Matthias Raffelsieper, which might have been forestalled if the
error message had reported the wrong column type as being "record".
Per Alvaro's advice, back-patch to branches before 9.4, but resist
the temptation to rephrase any existing strings there. Adding new
strings is not really a translation degradation; anyway having the
info presented in English is better than not having it at all.
The output buffer size in unaccent_lexize() was calculated as input string
length times pg_database_encoding_max_length(), which effectively assumes
that replacement strings aren't more than one character. While that was
all that we previously documented it to support, the code actually has
always allowed replacement strings of arbitrary length; so if you tried
to make use of longer strings, you were at risk of buffer overrun. To fix,
use an expansible StringInfo buffer instead of trying to determine the
maximum space needed a-priori.
This would be a security issue if unaccent rules files could be installed
by unprivileged users; but fortunately they can't, so in the back branches
the problem can be labeled as improper configuration by a superuser.
Nonetheless, a memory stomp isn't a nice way of reacting to improper
configuration, so let's back-patch the fix.
This function continued to use it after heap_endscan() freed it. In
passing, don't explicit create a strategy here. Instead, use the one
created by heap_beginscan_strat(), if any. Back-patch to 9.2, where use
of a BufferAccessStrategy here was introduced.
Instead of truncating pg_multixact at vacuum time, do it only at
checkpoint time. The reason for doing it this way is twofold: first, we
want it to delete only segments that we're certain will not be required
if there's a crash immediately after the removal; and second, we want to
do it relatively often so that older files are not left behind if
there's an untimely crash.
Per my proposal in
http://www.postgresql.org/message-id/20140626044519.GJ7340@eldon.alvh.no-ip.org
we now execute the truncation in the checkpointer process rather than as
part of vacuum. Vacuum is in only charge of maintaining in shared
memory the value to which it's possible to truncate the files; that
value is stored as part of checkpoints also, and so upon recovery we can
reuse the same value to re-execute truncate and reset the
oldest-value-still-safe-to-use to one known to remain after truncation.
Per bug reported by Jeff Janes in the course of his tests involving
bug #8673.
While at it, update some comments that hadn't been updated since
multixacts were changed.
Backpatch to 9.3, where persistency of pg_multixact files was
introduced by commit 0ac5ad5134.
We were allowing a table's pg_class.relminmxid value to move backwards
when heaps were swapped by VACUUM FULL or CLUSTER. There is a
similar protection against relfrozenxid going backwards, which we
neglected to clone when the multixact stuff was rejiggered by commit
0ac5ad5134.
Backpatch to 9.3, where relminmxid was introduced.
As reported by Heikki in
http://www.postgresql.org/message-id/52401AEA.9000608@vmware.com
Don't assert MultiXactIdIsRunning if the multi came from a tuple that
had been share-locked and later copied over to the new cluster by
pg_upgrade. Doing that causes an error to be raised unnecessarily:
MultiXactIdIsRunning is not open to the possibility that its argument
came from a pg_upgraded tuple, and all its other callers are already
checking; but such multis cannot, obviously, have transactions still
running, so the assert is pointless.
Noticed while investigating the bogus pg_multixact/offsets/0000 file
left over by pg_upgrade, as reported by Andres Freund in
http://www.postgresql.org/message-id/20140530121631.GE25431@alap3.anarazel.de
Backpatch to 9.3, as the commit that introduced the buglet.
When we committed a87c729153, we somehow
failed to notice that it didn't merely improve plan quality for expression
indexes; there were very closely related cases that failed outright with
"could not find pathkey item to sort". The failing cases seem to be those
where the planner was already capable of selecting a MergeAppend plan,
and there was inheritance involved: the lack of appropriate eclass child
members would prevent prepare_sort_from_pathkeys() from succeeding on the
MergeAppend's child plan nodes for inheritance child tables.
Accordingly, back-patch into 9.1 through 9.3, along with an extra
regression test case covering the problem.
Per trouble report from Michael Glaesemann.
7380b63 changed log_filename so that epoch was not appended to it
when no format specifier is given. But the example of CSV log file name
with epoch still left in log_filename document. This commit removes
such obsolete example.
This commit also documents the defaults of log_directory and
log_filename.
Backpatch to all supported versions.
Christoph Berg
populate_recordset_object_start() improperly created a new hash table
(overwriting the link to the existing one) if called at nest levels
greater than one. This resulted in previous fields not appearing in
the final output, as reported by Matti Hameister in bug #10728.
In 9.4 the problem also affects json_to_recordset.
This perhaps missed detection earlier because the default behavior is to
throw an error for nested objects: you have to pass use_json_as_text = true
to see the problem.
In addition, fix query-lifespan leakage of the hashtable created by
json_populate_record(). This is pretty much the same problem recently
fixed in dblink: creating an intended-to-be-temporary context underneath
the executor's per-tuple context isn't enough to make it go away at the
end of the tuple cycle, because MemoryContextReset is not
MemoryContextResetAndDeleteChildren.
Michael Paquier and Tom Lane
This fixes a bug that caused vacuum to fail when the '0000' files left
by initdb were accessed as part of vacuum's cleanup of old pg_multixact
files.
Backpatch through 9.3
The syntax doesn't let you specify "WITH OIDS" for foreign tables, but it
was still possible with default_with_oids=true. But the rest of the system,
including pg_dump, isn't prepared to handle foreign tables with OIDs
properly.
Backpatch down to 9.1, where foreign tables were introduced. It's possible
that there are databases out there that already have foreign tables with
OIDs. There isn't much we can do about that, but at least we can prevent
them from being created in the future.
Patch by Etsuro Fujita, reviewed by Hadi Moshayedi.
By using curly braces, the template had specified that one of
"NOT DEFERRABLE", "INITIALLY IMMEDIATE", or "INITIALLY DEFERRED"
was required on any CREATE TRIGGER statement, which is not
accurate. Change to square brackets makes that optional.
Backpatch to 9.1, where the error was introduced.
dblink uses a short-lived data conversion memory context. However it
was not deleted when no longer needed, leading to a noticeable memory
leak under some circumstances. Plug the hole, along with minor
refactoring. Backpatch to 9.2 where the leak was introduced.
Report and initial patch by MauMau. Reviewed/modified slightly by
Tom Lane and me.
Since fdf9e21196 lazy_vacuum_page() rechecks the all-visible status
of pages in the second pass over the heap. It does so inside a
critical section, but both visibilitymap_test() and
heap_page_is_all_visible() perform operations that should not happen
inside one. The former potentially performs IO and both potentially do
memory allocations.
To fix, simply move all the all-visible handling outside the critical
section. Doing so means that the PD_ALL_VISIBLE on the page won't be
included in the full page image of the HEAP2_CLEAN record anymore. But
that's fine, the flag will be set by the HEAP2_VISIBLE logged later.
Backpatch to 9.3 where the problem was introduced. The bug only came
to light due to the assertion added in 4a170ee9 and isn't likely to
cause problems in production scenarios. The worst outcome is a
avoidable PANIC restart.
This also gets rid of the difference in the order of operations
between master and standby mentioned in 2a8e1ac5.
Per reports from David Leverton and Keith Fiske in bug #10533.
ExecMakeTableFunctionResult evaluated the arguments for a function-in-FROM
in the query-lifespan memory context. This is insignificant in simple
cases where the function relation is scanned only once; but if the function
is in a sub-SELECT or is on the inside of a nested loop, any memory
consumed during argument evaluation can add up quickly. (The potential for
trouble here had been foreseen long ago, per existing comments; but we'd
not previously seen a complaint from the field about it.) To fix, create
an additional temporary context just for this purpose.
Per an example from MauMau. Back-patch to all active branches.
Any OS user able to access the socket can connect as the bootstrap
superuser and proceed to execute arbitrary code as the OS user running
the test. Protect against that by placing the socket in a temporary,
mode-0700 subdirectory of /tmp. The pg_regress-based test suites and
the pg_upgrade test suite were vulnerable; the $(prove_check)-based test
suites were already secure. Back-patch to 8.4 (all supported versions).
The hazard remains wherever the temporary cluster accepts TCP
connections, notably on Windows.
As a convenient side effect, this lets testing proceed smoothly in
builds that override DEFAULT_PGSOCKET_DIR. Popular non-default values
like /var/run/postgresql are often unwritable to the build user.
Security: CVE-2014-0067
This function is pervasive on free software operating systems; import
NetBSD's implementation. Back-patch to 8.4, like the commit that will
harness it.
Prior to 9.0, pg_dump handled comments on large objects by dumping a bunch
of COMMENT commands into a single BLOB COMMENTS archive object. With
sufficiently many such comments, some of the commands would likely get
split across bufferloads when restoring, causing failures in
direct-to-database restores (though no problem would be evident in text
output). This is the same type of issue we have with table data dumped as
INSERT commands, and it can be fixed in the same way, by using a mini SQL
lexer to figure out where the command boundaries are. Fortunately, the
COMMENT commands are no more complex to lex than INSERTs, so we can just
re-use the existing lexer for INSERTs.
Per bug #10611 from Jacek Zalewski. Back-patch to all active branches.
Robert Frost is no longer with us, but his copyrights still are, so
let's stop using "Stopping by Woods on a Snowy Evening" as test data
before somebody decides to sue us. Wordsworth is more safely dead.
When we grabbed this file off the Snowball project's website, we mistakenly
supposed that it was in LATIN1 encoding, but evidently it was actually in
LATIN2. This resulted in ő (o-double-acute, U+0151, which is code 0xF5 in
LATIN2) being misconverted into õ (o-tilde, U+00F5), as complained of in
bug #10589 from Zoltán Sörös. We'd have messed up u-double-acute too,
but there aren't any of those in the file. Other characters used in the
file have the same codes in LATIN1 and LATIN2, which no doubt helped hide
the problem for so long.
The error is not only ours: the Snowball project also was confused about
which encoding is required for Hungarian. But dealing with that will
require source-code changes that I'm not at all sure we'll wish to
back-patch. Fixing the stopword file seems reasonably safe to back-patch
however.
Although this bug is already fixed in post-9.2 branches, the case
triggering it is quite different from what was under consideration
at the time. It seems worth memorializing this example in HEAD
just to make sure it doesn't get broken again in future.
Extracted from commit 187ae17300.
Previously, the code used a node label of zero both for strings that
contain no bytes beyond the inner tuple's prefix, and for cases where an
"allTheSame" inner tuple has to be split to allow a string with a different
next byte to be inserted into it. Failing to distinguish these cases meant
that if a string ending with the current prefix needed to be inserted into
an allTheSame tuple, we got into an infinite loop, because after splitting
the tuple we'd descend into the child allTheSame tuple and then find we
need to split again.
To fix, instead use -1 and -2 as the node labels for these two cases.
This requires widening the node label type from "char" to int2, but
fortunately SPGiST stores all pass-by-value node label types in their
Datum representation, which means that this change is transparently upward
compatible so far as the on-disk representation goes. We continue to
recognize zero as a dummy node label for reading purposes, but will not
attempt to push new index entries down into such a label, so that the loop
won't occur even when dealing with an existing index.
Per report from Teodor Sigaev. Back-patch to 9.2 where the faulty
code was introduced.
In a50d976254 I already changed this, but got it wrong for the case
where the number of members is larger than the number of entries that
fit in the last page of the last segment.
As reported by Serge Negodyuck in a followup to bug #8673.
This commit changes HS regression test so that it uses
REPEATABLE READ transaction instead of SERIALIZABLE one
because SERIALIZABLE transaction isolation level is not
available in HS. Also this commit fixes VACUUM/ANALYZE
label mixup.
This was fixed in HEAD (commit 2985e16), but it should
have been back-patched to 9.1 which had introduced SSI
and forbidden SERIALIZABLE transaction in HS.
Amit Langote
It's critical that the backend's idea of LOBLKSIZE match the way data has
actually been divided up in pg_largeobject. While we don't provide any
direct way to adjust that value, doing so is a one-line source code change
and various people have expressed interest recently in changing it. So,
just as with TOAST_MAX_CHUNK_SIZE, it seems prudent to record the value in
pg_control and cross-check that the backend's compiled-in setting matches
the on-disk data.
Also tweak the code in inv_api.c so that fetches from pg_largeobject
explicitly verify that the length of the data field is not more than
LOBLKSIZE. Formerly we just had Asserts() for that, which is no protection
at all in production builds. In some of the call sites an overlength data
value would translate directly to a security-relevant stack clobber, so it
seems worth one extra runtime comparison to be sure.
In the back branches, we can't change the contents of pg_control; but we
can still make the extra checks in inv_api.c, which will offer some amount
of protection against running with the wrong value of LOBLKSIZE.
HeapTupleSatisfiesVacuum() didn't properly discern between
DELETE_IN_PROGRESS and INSERT_IN_PROGRESS for rows that have been
inserted in the current transaction and deleted in a aborted
subtransaction of the current backend. At the very least that caused
problems for CLUSTER and CREATE INDEX in transactions that had
aborting subtransactions producing rows, leading to warnings like:
WARNING: concurrent delete in progress within table "..."
possibly in an endless, uninterruptible, loop.
Instead of treating *InProgress xmins the same as *IsCurrent ones,
treat them as being distinct like the other visibility routines. As
implemented this separatation can cause a behaviour change for rows
that have been inserted and deleted in another, still running,
transaction. HTSV will now return INSERT_IN_PROGRESS instead of
DELETE_IN_PROGRESS for those. That's both, more in line with the other
visibility routines and arguably more correct. The latter because a
INSERT_IN_PROGRESS will make callers look at/wait for xmin, instead of
xmax.
The only current caller where that's possibly worse than the old
behaviour is heap_prune_chain() which now won't mark the page as
prunable if a row has concurrently been inserted and deleted. That's
harmless enough.
As a cautionary measure also insert a interrupt check before the gotos
in IndexBuildHeapScan() that lead to the uninterruptible loop. There
are other possible causes, like a row that several sessions try to
update and all fail, for repeated loops and the cost of doing so in
the retry case is low.
As this bug goes back all the way to the introduction of
subtransactions in 573a71a5da backpatch to all supported releases.
Reported-By: Sandro Santilli
This test previously used a data value containing U+0080, and would
therefore fail if the database encoding didn't have an equivalent to
that; which only about half of our supported server encodings do.
We could fall back to using some plain-ASCII character, but that seems
like it's losing most of the point of the test. Instead switch to using
U+00A0 (no-break space), which translates into all our supported encodings
except the four in the EUC_xx family.
Per buildfarm testing. Back-patch to 9.1, which is as far back as this
test is expected to succeed everywhere. (9.0 has the test, but without
back-patching some 9.1 code changes we could not expect to get consistent
results across platforms anyway.)
Because RecoveryConflictInterrupt() didn't set the process latch
anything using the latter to wait for events didn't get notified about
recovery conflicts. Most latch users are never the target of recovery
conflicts, which explains the lack of reports about this until
now.
Since 9.3 two possible affected users exist though: The sql callable
pg_sleep() now uses latches to wait and background workers are
expected to use latches in their main loop. Both would currently wait
until the end of WaitLatch's timeout.
Fix by adding a SetLatch() to RecoveryConflictInterrupt(). It'd also
be possible to fix the issue by having each latch user set
set_latch_on_sigusr1. That seems failure prone and though, as most of
these callsites won't often receive recovery conflicts and thus will
likely only be tested against normal query cancels et al. It'd also be
unnecessarily verbose.
Backpatch to 9.1 where latches were introduced. Arguably 9.3 would be
sufficient, because that's where pg_sleep() was converted to waiting
on the latch and background workers got introduced; but there could be
user level code making use of the latch pre 9.3.
Back-patch commit d0765d50f4 into 9.3
and 9.2, which is as far back as we previously bothered to adjust the
regression tests for Python 3.3. Per gripe from Honza Horak.
As of Xcode 5.0, Apple isn't including the Python framework as part of the
SDK-level files, which means that linking to it might fail depending on
whether Xcode thinks you've selected a specific SDK version. According to
their Tech Note 2328, they've basically deprecated the framework method of
linking to libpython and are telling people to link to the shared library
normally. (I'm pretty sure this is in direct contradiction to the advice
they were giving a few years ago, but whatever.) Testing says that this
approach works fine at least as far back as OS X 10.4.11, so let's just
rip out the framework special case entirely. We do still need a special
case to decide that OS X provides a shared library at all, unfortunately
(I wonder why the distutils check doesn't work ...). But this is still
less of a special case than before, so it's fine.
Back-patch to all supported branches, since we'll doubtless be hearing
about this more as more people update to recent Xcode.
The original coding in contrib/uuid-ossp created and destroyed a uuid_t
object (or, in some cases, even two of them) each time it was called.
This is not the intended usage: you're supposed to keep the uuid_t object
around so that the library can cache its state across uses. (Other UUID
libraries seem to keep equivalent state behind-the-scenes in static
variables, but OSSP chose differently.) Aside from being quite inefficient,
creating a new uuid_t loses knowledge of the previously generated UUID,
which in theory could result in duplicate V1-style UUIDs being created
on sufficiently fast machines.
On at least some platforms, creating a new uuid_t also draws some entropy
from /dev/urandom, leaving less for the rest of the system. This seems
sufficiently unpleasant to justify back-patching this change.
This reverts commit ece7aa8b0f.
It turns out that the %name-prefix syntax without "=" does not work
at all in pre-2.4 Bison. We are not prepared to make such a large
jump in minimum required Bison version just to suppress a warning
message in a version hardly any developers are using yet.
When 3.0 gets more popular, we'll figure out a way to deal with this.
In the meantime, BISONFLAGS=-Wno-deprecated is recommendable for
anyone using 3.0 who doesn't want to see the warning.
%name-prefix doesn't use an "=" sign according to the Bison docs, but it
silently accepted one anyway, until Bison 3.0. This was originally a
typo of mine in commit 012abebab1, and we
seem to have slavishly copied the error into all the other grammar files.
Per report from Vik Fearing; analysis by Peter Eisentraut.
Back-patch to all active branches, since somebody might try to build
a back branch with up-to-date tools.
Move the code that sends the initial status information as well as the
calculation of paths inside the ENSURE_ERROR_CLEANUP block. If this code
failed, we would "leak" a counter of number of concurrent backups, thereby
making the system always believe it was in backup mode. This could happen
if the sending failed (which it probably never did given that the small
amount of data to send would never cause a flush). It is very low risk, but
all operations after do_pg_start_backup should be protected.
On Mingw, it seems that scanf() doesn't necessarily accept the same format
codes that printf() does, and in particular it may fail to recognize %llu
even though printf() does. Since configure only probes printf() behavior
while setting up the INT64_FORMAT macros, this means it's unsafe to use
those macros with scanf(). We had only one instance of such a coding
pattern, in contrib/pg_stat_statements, so change that code to avoid
the problem.
Per buildfarm warnings. Back-patch to 9.0 where the troublesome code
was introduced.
Michael Paquier
Commit af7914c662, which introduced the
EXPLAIN (TIMING) option, for some reason coded explain.c to look at
planstate->instrument->need_timer rather than es->timing to decide
whether to print timing info. However, the former flag might get set
as a result of contrib/auto_explain wanting timing information. We
certainly don't want activation of auto_explain to change user-visible
statement behavior, so fix that.
Also fix an independent bug introduced in the same patch: in the code
path for a never-executed node with a machine-friendly output format,
if timing was selected, it would fail to print the Actual Rows and Actual
Loops items.
Per bug #10404 from Tomonari Katsumata. Back-patch to 9.2 where the
faulty code was introduced.
The macros and functions that work with backup blocks in the redo function
use 0-based numbering, so let's use that consistently in the function that
generates the records too. Makes it so much easier to compare the
generation and replay functions.
Backpatch to 9.0, where we switched from 1-based to 0-based numbering.
