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a3ab7a707d
A compressed stream may end with an empty packet. In this case decompression finishes before reading the empty packet and the remaining stream packet causes a failure in reading the following data. This commit makes sure to consume such extra data, avoiding a failure when decompression the data. This corner case was reproducible easily with a data length of 16kB, and existed sincee94dd6a. A cheap regression test is added to cover this case based on a random, incompressible string. The first attempt of this patch has allowed to find an older failure within the compression logic of pgcrypto, fixed byb9b6105. This involved SLES 15 with z390 where a custom flavor of libz gets used. Bonus thanks to Mark Wong for providing access to the specific environment. Reported-by: Frank Gagnepain Author: Kyotaro Horiguchi, Michael Paquier Reviewed-by: Tom Lane Discussion: https://postgr.es/m/16476-692ef7b84e5fb893@postgresql.org Backpatch-through: 9.5
52 lines
1.7 KiB
SQL
52 lines
1.7 KiB
SQL
--
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-- PGP compression support
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--
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select pgp_sym_decrypt(dearmor('
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-----BEGIN PGP MESSAGE-----
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ww0ECQMCsci6AdHnELlh0kQB4jFcVwHMJg0Bulop7m3Mi36s15TAhBo0AnzIrRFrdLVCkKohsS6+
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DMcmR53SXfLoDJOv/M8uKj3QSq7oWNIp95pxfA==
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=tbSn
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-----END PGP MESSAGE-----
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'), 'key', 'expect-compress-algo=1');
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select pgp_sym_decrypt(
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pgp_sym_encrypt('Secret message', 'key', 'compress-algo=0'),
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'key', 'expect-compress-algo=0');
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select pgp_sym_decrypt(
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pgp_sym_encrypt('Secret message', 'key', 'compress-algo=1'),
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'key', 'expect-compress-algo=1');
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select pgp_sym_decrypt(
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pgp_sym_encrypt('Secret message', 'key', 'compress-algo=2'),
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'key', 'expect-compress-algo=2');
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-- level=0 should turn compression off
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select pgp_sym_decrypt(
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pgp_sym_encrypt('Secret message', 'key',
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'compress-algo=2, compress-level=0'),
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'key', 'expect-compress-algo=0');
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-- check corner case involving an input string of 16kB, as per bug #16476.
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SELECT setseed(0);
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WITH random_string AS
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(
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-- This generates a random string of 16366 bytes. This is chosen
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-- as random so that it does not get compressed, and the decompression
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-- would work on a string with the same length as the origin, making the
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-- test behavior more predictible. lpad() ensures that the generated
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-- hexadecimal value is completed by extra zero characters if random()
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-- has generated a value strictly lower than 16.
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SELECT string_agg(decode(lpad(to_hex((random()*256)::int), 2, '0'), 'hex'), '') as bytes
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FROM generate_series(0, 16365)
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)
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SELECT bytes =
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pgp_sym_decrypt_bytea(
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pgp_sym_encrypt_bytea(bytes, 'key',
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'compress-algo=1,compress-level=1'),
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'key', 'expect-compress-algo=1')
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AS is_same
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FROM random_string;
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