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help / color / mirror / Atom feedFrom: Noah Misch <[email protected]>
To: [email protected]
Subject: pgsql: Mark PQfn() unsafe and fix overrun in frontend LO interface.
Date: Mon, 11 May 2026 12:19:39 +0000
Message-ID: <[email protected]> (raw)
Mark PQfn() unsafe and fix overrun in frontend LO interface.
When result_is_int is set to 0, PQfn() cannot validate that the
result fits in result_buf, so it will write data beyond the end of
the buffer when the server returns more data than requested. Since
this function is insecurable and obsolete, add a warning to the top
of the pertinent documentation advising against its use.
The only in-tree caller of PQfn() is the frontend large object
interface. To fix that, add a buf_size parameter to
pqFunctionCall3() that is used to protect against overruns, and use
it in a private version of PQfn() that also accepts a buf_size
parameter.
Reported-by: Yu Kunpeng <[email protected]>
Reported-by: Martin Heistermann <[email protected]>
Author: Nathan Bossart <[email protected]>
Reviewed-by: Noah Misch <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Reviewed-by: Etsuro Fujita <[email protected]>
Security: CVE-2026-6477
Backpatch-through: 14
Branch
------
REL_17_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/d88c7be156bbde61ccff337152bf640387b2c629
Author: Nathan Bossart <[email protected]>
Modified Files
--------------
doc/src/sgml/libpq.sgml | 11 ++++++++---
src/interfaces/libpq/fe-exec.c | 16 +++++++++++++++-
src/interfaces/libpq/fe-lobj.c | 12 ++++++------
src/interfaces/libpq/fe-protocol3.c | 13 ++++++++++++-
src/interfaces/libpq/libpq-int.h | 6 +++++-
5 files changed, 46 insertions(+), 12 deletions(-)
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Subject: Re: pgsql: Mark PQfn() unsafe and fix overrun in frontend LO interface.
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