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-rw-r--r--src/backend/commands/variable.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/backend/commands/variable.c b/src/backend/commands/variable.c
index f801faacd29..57da0149d9f 100644
--- a/src/backend/commands/variable.c
+++ b/src/backend/commands/variable.c
@@ -854,6 +854,9 @@ check_role(char **newval, void **extra, GucSource source)
roleid = InvalidOid;
is_superuser = false;
}
+ /* Do not allow setting role to a reserved role. */
+ else if (strncmp(*newval, "pg_", 3) == 0)
+ return false;
else
{
if (!IsTransactionState())