Up until now, we've been using timezone and tzname, but Visual Studio
2015 (for which we wish to add support) no longer declares those
symbols. All versions since Visual Studio 2003 apparently support the
underscore-equipped names, and we don't support anything older than
Visual Studio 2005, so this should work OK everywhere. But let's see
what the buildfarm thinks.
Michael Paquier, reviewed by Petr Jelinek
The new functions are pi(), random(), random_exponential(),
random_gaussian(), and sqrt(). I was worried that this would be
slower than before, but, if anything, it actually turns out to be
slightly faster, because we now express the built-in pgbench scripts
using fewer lines; each \setrandom can be merged into a subsequent
\set.
Fabien Coelho
Corrects an oversight in 2c83f435a3 where the $timed_out reference var
isn't initialized; using it would require the caller to initialize it
beforehand, which is cumbersome.
Author: Craig Ringer
Documentation mentioned B-tree, GiST and GIN as able to do multicolumn
indexes; I failed to add BRIN to the list.
Author: Petr Jediný
Reviewed-By: Fujii Masao, Emre Hasegeli
This brings us a bit closer to matching upstream, but since it affects
files outside src/timezone/, we might choose not to back-patch it.
Hence keep it separate from the main update patch.
We hadn't done this in about six years, which proves to have been a mistake
because there's been a lot of code churn upstream, making the merge rather
painful. But putting it off any further isn't going to lessen the pain,
and there are at least two incompatible changes that we need to absorb
before someone starts complaining that --with-system-tzdata doesn't work
at all on their platform, or we get blindsided by a tzdata release that
our out-of-date zic can't compile. Last week's "time zone abbreviation
differs from POSIX standard" mess was a wake-up call in that regard.
This is a sufficiently large patch that I'm afraid to back-patch it
immediately, though the foregoing considerations imply that we probably
should do so eventually. For the moment, just put it in HEAD so that
it can get some testing. Maybe we can wait till the end of the 9.6
beta cycle before deeming it okay.
Change the slightly different variations of the message
function FOO must return type BAR
to a single wording, removing the variability in type name so that they
all create a single translation entry; since the type name is not to be
translated, there's no point in it being part of the message anyway.
Also, change them all to use the same quoting convention, namely that
the function name is not to be quoted but the type name is. (I'm not
quite sure why this is so, but it's the clear majority.)
Some similar messages such as "encoding conversion function FOO must ..."
are also changed.
brin_page_type() and brin_metapage_info() did not enforce being called
by superuser, like other pageinspect functions that take bytea do.
Since they don't verify the passed page thoroughly, it is possible to
use them to read the server memory with a carefully crafted bytea value,
up to a file kilobytes from where the input bytea is located.
Have them throw errors if called by a non-superuser.
Report and initial patch: Andreas Seltenreich
Security: CVE-2016-3065
In the plancache, we check if the environment we planned the query under
has changed in a way which requires us to re-plan, such as when the user
for whom the plan was prepared changes and RLS is being used (and,
therefore, there may be different policies to apply).
Unfortunately, while those values were set and checked, they were not
being reset when the query was re-planned and therefore, in cases where
we change role, re-plan, and then change role again, we weren't
re-planning again. This leads to potentially incorrect policies being
applied in cases where role-specific policies are used and a given query
is planned under one role and then executed under other roles, which
could happen under security definer functions or when a common user and
query is planned initially and then re-used across multiple SET ROLEs.
Further, extensions which made use of CopyCachedPlan() may suffer from
similar issues as the RLS-related fields were not properly copied as
part of the plan and therefore RevalidateCachedQuery() would copy in the
current settings without invalidating the query.
Fix by using the same approach used for 'search_path', where we set the
correct values in CompleteCachedPlan(), check them early on in
RevalidateCachedQuery() and then properly reset them if re-planning.
Also, copy through the values during CopyCachedPlan().
Pointed out by Ashutosh Bapat. Reviewed by Michael Paquier.
Back-patch to 9.5 where RLS was introduced.
Security: CVE-2016-2193
Fix up check for high-bit-set characters, which provoked "comparison is
always true due to limited range of data type" warnings on some compilers,
and was unlike the way we do it elsewhere anyway. Fix omission of "$"
from the set of valid identifier continuation characters. Get rid of
sanitize_text(), which was utterly inconsistent with any other error report
anywhere in the system, and wasn't even well designed on its own terms
(double-quoting the result string without escaping contained double quotes
doesn't seem very well thought out). Fix up error messages, which didn't
follow the message style guidelines very well, and were overly specific in
situations where the actual mistake might not be what they said. Improve
documentation.
(I started out just intending to fix the compiler warning, but the more
I looked at the patch the less I liked it.)
If the referenced rel was proven empty, we'd compute 0/0 here, which
results in the function returning NaN. That's a bit more serious
than the other zero-divide case. Still, it only seems to be possible
in HEAD, so no back-patch.
Per report from Piotr Stefaniak. I looked through the rest of selfuncs.c
and found no other likely trouble spots.
This avoids a possible divide-by-zero in the following calculation,
and rounding the number to an integer seems like saner behavior anyway.
Assuming IEEE math, the division would yield +Infinity which would get
replaced by 1.0 at the bottom of the function, so nothing really
interesting would ensue; but avoiding divide-by-zero seems like a
good idea on general principles.
Per report from Piotr Stefaniak. No back-patch since this seems
mostly cosmetic.
Previously pg_rewind did not fsync any files. That's problematic, given
that the target directory is modified. If the database was started
afterwards, 2ce439f33 luckily already caused the data directory to be
synced to disk at postmaster startup; reducing the scope of the problem.
To fix, use initdb -S, at the end of the pg_rewind run. It doesn't seem
worthwhile to duplicate the code into pg_rewind, and initdb -S is
already used that way by pg_upgrade.
Reported-By: Andres Freund
Author: Michael Paquier, somewhat edited by me
Discussion: 20160310034352.iuqgvpmg5qmnxtkz@alap3.anarazel.deCAB7nPqSytVG1o4S3S2pA1O=692ekurJ+fckW2PywEG3sNw54Ow@mail.gmail.com
Backpatch: 9.5, where pg_rewind was introduced
This was a relatively harmless leak, as createBackupLabel() is only
called once per pg_rewind invocation.
Author: Michael Paquier
Reported-By: Michael Paquier
Discussion: CAB7nPqRnOw30gOXe2_SPLjh37bgm4V+txbYAPwoXb97nGQ297w@mail.gmail.com
Backpatch: 9.5, where pg_rewind was introduced
Returning the direct result of bit arithmetic, in a macro intended to be
used in a boolean manner, can be problematic if the return value is
stored in a variable of type 'bool'. If bool is implemented using C99's
_Bool, that can lead to comparison failures if the variable is then
compared again with the expression (see ginStepRight() for an example
that fails), as _Bool forces the result to be 0/1. That happens in some
configurations of newer MSVC compilers. It's also problematic when
storing the result of such an expression in a narrower type.
Several gin macros have been declared in that style since gin's initial
commit in 8a3631f8d8.
There's a lot more macros like this, but this is the only one causing
regression test failures; and I don't want to commit and backpatch a
larger patch with lots of conflicts just before the next set of minor
releases.
Discussion: 20150811154237.GD17575@awork2.anarazel.de
Backpatch: All supported branches
We really need to sync all of our IANA-derived timezone code with upstream,
but that's going to be a large patch and I certainly don't care to shove
such a thing into stable branches immediately before a release. As a
stopgap, copy just the tzcode2016c logic that checks validity of timezone
abbreviations. This prevents getting multiple "time zone abbreviation
differs from POSIX standard" bleats with tzdata 2014b and later.
cost_subplan() supposed that the given subplan must have plan_rows > 0,
which as far as I can tell was true until recent refactoring of the
code in createplan.c; but now that code allows the Result for a provably
empty subquery to have plan_rows = 0. Rather than undo that change,
put in a clamp to prevent zero divide.
get_cheapest_fractional_path() likewise supposed that best_path->rows > 0.
This assumption has been wrong for longer. It's actually harmless given
IEEE float math, because a positive value divided by zero gives +Infinity
and compare_fractional_path_costs() will do the right thing with that.
Still, best not to assume that.
final_cost_nestloop() also seems to have some risks in this area, so
borrow the clamping logic already present in the mergejoin cost functions.
Lastly, remove unnecessary clamp_row_est() in planner.c's calls to
get_number_of_groups(). The only thing that function does with path_rows
is pass it to estimate_num_groups() which already has an internal clamp,
so we don't need the extra call; and if we did, the callers are arguably
the wrong place for it anyway.
First two items reported by Piotr Stefaniak, the others are products
of my nosing around for similar problems. No back-patch since there's
no evidence that problems arise in the back branches.
DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia (Altai,
Astrakhan, Kirov, Sakhalin, Ulyanovsk regions). Historical corrections
for Lithuania, Moldova, Russia (Kaliningrad, Samara, Volgograd).
As of 2015b, the keepers of the IANA timezone database started to use
numeric time zone abbreviations (e.g., "+04") instead of inventing
abbreviations not found in the wild like "ASTT". This causes our rather
old copy of zic to whine "warning: time zone abbreviation differs from
POSIX standard" several times during "make install". This warning is
harmless according to the IANA folk, and I don't see any problems with
these abbreviations in some simple tests; but it seems like now would be
a good time to update our copy of the tzcode stuff. I'll look into that
soon.
We don't really want to encourage people to write numeric SQLSTATEs in
programs; that's unreadable and error-prone. Copy plpgsql's infrastructure
for converting between SQLSTATEs and exception names shown in Appendix A,
and modify examples in tests and documentation to do it that way.
Tcl has a convention for returning additional info about an error in a
global variable named errorCode. Up to now PL/Tcl has ignored that,
but this patch causes database errors caught by PL/Tcl to fill in
errorCode with useful information from the ErrorData struct.
Jim Nasby, reviewed by Pavel Stehule and myself
This avoids leaving dangling links in pg_operator; which while fairly
harmless are also unsightly.
While we're at it, simplify OperatorUpd, which went through
heap_modify_tuple for no very good reason considering it had already made
a tuple copy it could just scribble on.
Roma Sokolov, reviewed by Tomas Vondra, additional hacking by Robert Haas
and myself.
In commit 9118d03a8c we taught the planner to postpone evaluation of
set-returning functions in a SELECT's targetlist until after any sort done
to satisfy ORDER BY. However, if we postpone some SRFs this way while
others do not get postponed (because they're sort or group key columns)
we will break the traditional behavior by which all SRFs in the tlist run
in-step during ExecTargetList(), so that you get the least common multiple
of their periods not the product. Fix make_sort_input_target() so it will
not split up SRF evaluation in such cases.
There is still a hazard of similar odd behavior if there's a SRF in a
grouping column and another one that isn't, but that was true before
and we're just trying to preserve bug-compatibility with the traditional
behavior. This whole area is overdue to be rethought and reimplemented,
but we'll try to avoid changing behavior until then.
Per report from Regina Obe.
Some of the non-MSVC Windows buildfarm members seem to need this to avoid
getting "undefined symbol" errors on libpgfeutils' references to libpq.
I could understand that if libpq were a static library, but surely it is
not? Oh well, at least the extra reference is no more harmful than it is
for libpgcommon or libpgport.
This completes (at least for now) the project of getting rid of ad-hoc
linkages among the src/bin/ subdirectories. Everything they share is now
in src/fe_utils/ and is included from a static library at link time.
A side benefit is that we can restore the FLEX_NO_BACKUP check for
psqlscanslash.l. We might need to think of another way to do that check
if we ever need to build two lexers with that property in the same source
directory, but there's no foreseeable reason to need that.
Compilers that don't know that elog(ERROR) doesn't return complained
that this function might fail to return a value. Per buildfarm.
While at it, const-ify the function's declaration, since the intent
is evidently to always return a constant string.
Per discussion, we want to create a static library and put the stuff into
it that until now has been shared across src/bin/ directories by ad-hoc
methods like symlinking a source file. This commit creates the library and
populates it with a couple of files that contain the widely-useful portions
of pg_dump's dumputils.c file. dumputils.c survives, because it has some
stuff that didn't seem appropriate for fe_utils, but it's significantly
smaller and is no longer referenced from any other directory.
Follow-on patches will move more stuff into fe_utils.
The Mkvcbuild.pm hacking here is just a best guess; we'll see how the
buildfarm likes it.
This enables external code to create access methods. This is useful so
that extensions can add their own access methods which can be formally
tracked for dependencies, so that DROP operates correctly. Also, having
explicit support makes pg_dump work correctly.
Currently only index AMs are supported, but we expect different types to
be added in the future.
Authors: Alexander Korotkov, Petr Jelínek
Reviewed-By: Teodor Sigaev, Petr Jelínek, Jim Nasby
Commitfest-URL: https://commitfest.postgresql.org/9/353/
Discussion: https://www.postgresql.org/message-id/CAPpHfdsXwZmojm6Dx+TJnpYk27kT4o7Ri6X_4OSWcByu1Rm+VA@mail.gmail.com
Now that we have src/common/ for code shared between frontend and backend,
we can get rid of (most of) the klugy ways that the keyword table and
keyword lookup code were formerly shared between different uses.
This is a first step towards a more general plan of getting rid of
special-purpose kluges for sharing code in src/bin/.
I chose to merge kwlookup.c back into keywords.c, as it once was, and
always has been so far as keywords.h is concerned. We could have
kept them separate, but there is noplace that uses ScanKeywordLookup
without also wanting access to the backend's keyword list, so there
seems little point.
ecpg is still a bit weird, but at least now the trickiness is documented.
I think that the MSVC build script should require no adjustments beyond
what's done here ... but we'll soon find out.
Unfortunately, every version of glibc thus far tested has bugs whereby
strcoll() ordering does not match strxfrm() ordering as required by
the standard. This can result in, for example, corrupted indexes.
Disabling abbreviated keys in these cases slows down non-C-collation
string sorting considerably, but there seems to be no practical
alternative. Users who are confident that their libc implementations
are solid in this regard can re-enable the optimization by compiling
with TRUST_STRXFRM.
Users who have built indexes using PostgreSQL 9.5 or PostgreSQL 9.5.1
should REINDEX if there is a possibility that they may have been
affected by this problem.
Report by Marc-Olaf Jaschke. Investigation mostly by Tom Lane, with
help from Peter Geoghegan, Noah Misch, Stephen Frost, and me. Patch
by me, reviewed by Peter Geoghegan and Tom Lane.
A join clause might mention multiple relations on either side, so it
need not be the case that a given joinrel's constituent relations are
all on one side of the join clause or all on the other.
Report by Rajkumar Raghuwanshi. Analysis and fix by Michael Paquier
and Ashutosh Bapat.
Without this, contention on the freelist can become a pretty serious
problem on large servers.
Aleksander Alekseev, reviewed by Anastasia Lubennikova, Dilip Kumar,
and me.
Robert Haas
Alvaro Herrera
Tom Lane
Teodor Sigaev
Stephen Frost
Andres Freund