postgresql: fix CVE-2022-41862

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-dbs/postgresql/files/0001-Properly-NULL-terminate-GSS-receive-buffer-on-error-.patch

@@ -0,0 +1,50 @@
+From 586b074026d703c29057b04b1318e984701fe195 Mon Sep 17 00:00:00 2001
+From: Changqing Li <changqing.li@windriver.com>
+Date: Thu, 2 Mar 2023 19:10:47 +0800
+Subject: [PATCH] Properly NULL-terminate GSS receive buffer on error packet
+ reception
+
+pqsecure_open_gss() includes a code path handling error messages with
+v2-style protocol messages coming from the server.  The client-side
+buffer holding the error message does not force a NULL-termination, with
+the data of the server getting copied to the errorMessage of the
+connection.  Hence, it would be possible for a server to send an
+unterminated string and copy arbitrary bytes in the buffer receiving the
+error message in the client, opening the door to a crash or even data
+exposure.
+
+As at this stage of the authentication process the exchange has not been
+completed yet, this could be abused by an attacker without Kerberos
+credentials.  Clients that have a valid kerberos cache are vulnerable as
+libpq opportunistically requests for it except if gssencmode is
+disabled.
+
+Author: Jacob Champion
+Backpatch-through: 12
+Security: CVE-2022-41862
+
+Upstream-Status: Backport [https://github.com/postgres/postgres/commit/71c37797d7bd78266146a5829ab62b3687c47295]
+CVE: CVE-2022-41862
+
+Signed-off-by: Changqing Li <changqing.li@windriver.com>
+---
+ src/interfaces/libpq/fe-secure-gssapi.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/src/interfaces/libpq/fe-secure-gssapi.c b/src/interfaces/libpq/fe-secure-gssapi.c
+index c783a53..a42ebc0 100644
+--- a/src/interfaces/libpq/fe-secure-gssapi.c
++++ b/src/interfaces/libpq/fe-secure-gssapi.c
+@@ -577,7 +577,8 @@ pqsecure_open_gss(PGconn *conn)
+ 				return result;
+ 
+ 			PqGSSRecvLength += ret;
+-
++			Assert(PqGSSRecvLength < PQ_GSS_RECV_BUFFER_SIZE);
++			PqGSSRecvBuffer[PqGSSRecvLength] = '\0';
+ 			appendPQExpBuffer(&conn->errorMessage, "%s\n", PqGSSRecvBuffer + 1);
+ 
+ 			return PGRES_POLLING_FAILED;
+-- 
+2.25.1
+

meta-oe/recipes-dbs/postgresql/postgresql_14.5.bb

@@ -9,6 +9,7 @@ SRC_URI += "\
    file://0001-configure.ac-bypass-autoconf-2.69-version-check.patch \
    file://remove_duplicate.patch \
    file://0001-config_info.c-not-expose-build-info.patch \
+   file://0001-Properly-NULL-terminate-GSS-receive-buffer-on-error-.patch \
 "
 
 SRC_URI[sha256sum] = "d4f72cb5fb857c9a9f75ec8cf091a1771272802f2178f0b2e65b7b6ff64f4a30"