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The PostgreSQL server will reject messages greater than ~1 GB anyway. However, worse than that is that a message that is larger than 4 GB could wrap the 32-bit integer message size and be interpreted by the server as multiple messages. This could allow a malicious client to inject arbitrary protocol messages. https://github.com/jackc/pgx/security/advisories/GHSA-mrww-27vc-gghv
21 lines
545 B
Go
21 lines
545 B
Go
package pgproto3_test
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import (
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"testing"
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"github.com/jackc/pgx/v5/pgproto3"
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"github.com/stretchr/testify/require"
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)
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func TestQueryBiggerThanMaxMessageBodyLen(t *testing.T) {
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t.Parallel()
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// Maximum allowed size. 4 bytes for size and 1 byte for 0 terminated string.
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_, err := (&pgproto3.Query{String: string(make([]byte, pgproto3.MaxMessageBodyLen-5))}).Encode(nil)
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require.NoError(t, err)
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// 1 byte too big
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_, err = (&pgproto3.Query{String: string(make([]byte, pgproto3.MaxMessageBodyLen-4))}).Encode(nil)
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require.Error(t, err)
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}
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